Abbas, SM, Sevimli, O, Heimlich, MC, Esselle, KP, Kimiaghalam, B, Foroughi, J & Safaei, F 2013, 'Microwave Characterization of Carbon Nanotube Yarns For UWB Medical Wireless Body Area Networks', IEEE Transactions on Microwave Theory and Techniques, vol. 61, no. 10, pp. 3625-3631.
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Afshar, S, Cohen, G, Wang, R, Schaik, AV, Tapson, J, Lehmann, T & Hamilton, TJ 2013, 'The Ripple Pond: Enabling Spiking Networks to See', Frontiers in Neuroscience, no. 7 NOV.
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In this paper we present the biologically inspired Ripple Pond Network (RPN),a simply connected spiking neural network that, operating together withrecently proposed PolyChronous Networks (PCN), enables rapid, unsupervised,scale and rotation invariant object recognition using efficient spatio-temporalspike coding. The RPN has been developed as a hardware solution linkingpreviously implemented neuromorphic vision and memory structures capable ofdelivering end-to-end high-speed, low-power and low-resolution recognition formobile and autonomous applications where slow, highly sophisticated and powerhungry signal processing solutions are ineffective. Key aspects in the proposedapproach include utilising the spatial properties of physically embedded neuralnetworks and propagating waves of activity therein for information processing,using dimensional collapse of imagery information into amenable temporalpatterns and the use of asynchronous frames for information binding.
Agrawal, A, Azabi, YO & Rahman, BMA 2013, 'Stacking the Equiangular Spiral', IEEE Photonics Technology Letters, vol. 25, no. 3, pp. 291-294.
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Agrawal, A, Tiwari, M, Azabi, YO, Janyani, V, Rahman, BMA & Grattan, KTV 2013, 'Ultrabroad supercontinuum generation in tellurite equiangular spiral photonic crystal fiber', Journal of Modern Optics, vol. 60, no. 12, pp. 956-962.
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Aguilera, RP & Quevedo, DE 2013, 'Stability Analysis of Quadratic MPC With a Discrete Input Alphabet', IEEE Transactions on Automatic Control, vol. 58, no. 12, pp. 3190-3196.
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Aguilera, RP, Lezana, P & Quevedo, DE 2013, 'Finite-Control-Set Model Predictive Control With Improved Steady-State Performance', IEEE Transactions on Industrial Informatics, vol. 9, no. 2, pp. 658-667.
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Finite-control-set model predictive control (FCS-MPC) is a novel and promising control scheme for power converters and drives. Many practical and theoretical issues have been presented in the literature, showing good performance of this technique. The present work deals with one of the most relevant aspects of any controller, namely, the steady-state operation. As will be shown, basic FCS-MPC formulations can be enhanced to achieve a reduced average steady-state error. As an illustrative example, we apply our proposal to a simple H-Bridge power converter. Experimental results were carried out to verify the performance obtained by the proposed predictive strategies. © 2012 IEEE.
AlAamri, H, Abolhasan, M, Franklin, D & Lipman, J 2013, 'Optimised relay selection for route discovery in reactive routing', AD HOC NETWORKS, vol. 11, no. 1, pp. 70-88.
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On-demand routing protocols have the potential to provide scalable information delivery in large ad hoc networks. The novelty of these protocols is in their approach to route discovery, where a route is determined only when it is required by initiating a route discovery procedure. Much of the research in this area has focused on reducing the route discovery overhead when prior knowledge of the destination is available at the source or by routing through stable links. Hence, many of the protocols proposed to date still resort to flooding the network when prior knowledge about the destination is un-available. This paper proposes a novel routing protocol for ad hoc networks, called On-demand Tree-based Routing Protocol (OTRP). This protocol combines the idea of hop-by-hop routing (as used by AODV) with an efficient route discovery algorithm called Tree-based Optimised Flooding (TOF) to improve scalability of ad hoc networks when there is no prior knowledge about the destination. To achieve this in OTRP, route discovery overheads are minimised by selectively flooding the network through a limited set of nodes, referred to as branching nodes. The key factors governing the performance of OTRP are theoretically analysed and evaluated, including the number of branch nodes, location of branching nodes and number of Route REQuest (RREQ) retries. It was found that the performance of OTRP (evaluated using a variety of well-known metrics) improves as the number of branching nodes increases and the number of consumed RREQ retries is reduced. Additionally, theoretical analysis and simulation results shows that OTRP outperforms AODV, DYMO, and OLSR with reduced overheads as the number of nodes and traffic load increases. © 2012 Elsevier B.V. All rights reserved.
Aljarajreh, H, Reaz, MBI, Amin, MS & Husain, H 2013, 'An Active Inductor Based Low Noise Amplifier for RF Receiver', Electronics and Electrical Engineering, vol. 19, no. 5, pp. 49-52.
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Anand, S, Nylk, J, Neale, SL, Dodds, C, Grant, S, Ismail, MH, Reboud, J, Cooper, JM & McGloin, D 2013, 'Aerosol droplet optical trap loading using surface acoustic wave nebulization', OPTICS EXPRESS, vol. 21, no. 25, pp. 30148-30155.
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Athab, HS & Lu, DD 2013, 'Quasi‐active power factor correction on flyback‐based dc/dc converter', International Journal of Circuit Theory and Applications, vol. 41, no. 5, pp. 483-497.
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This paper presents a novel input current shaper based on a quasi‐active power factor correction (PFC) scheme. In this method, high power factor and low harmonic content are achieved by providing an auxiliary PFC circuit with a driving voltage which is derived from a third winding of the transformer of a cascaded dc/dc flyback converter. It eliminates the use of active switch and control circuit for PFC. The auxiliary winding provides a controlled voltage‐boost function for bulk capacitor without inducing a dead angle in the line current. Since the dc/dc converter operates at high switching frequency, the driving voltage is also of high switching frequency, which results in reducing the size of the magnetic components. Operating principles, analysis and experimental results of the proposed method are presented. Copyright © 2011 John Wiley & Sons, Ltd.
Aziz, T, Hossain, MJ, Saha, TK & Mithulananthan, N 2013, 'VAR Planning With Tuning of STATCOM in a DG Integrated Industrial System', IEEE Transactions on Power Delivery, vol. 28, no. 2, pp. 875-885.
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Borzeshi, EZ, Perez Concha, O, Xu, RYD & Piccardi, M 2013, 'Joint Action Segmentation and Classification by an Extended Hidden Markov Model', IEEE Signal Processing Letters, vol. 20, no. 12, pp. 1207-1210.
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Hidden Markov models (HMMs) provide joint segmentation and classification of sequential data by efficient inference algorithms and have therefore been employed in fields as diverse as speech recognition, document processing, and genomics. However, conventional HMMs do not suit action segmentation in video due to the nature of the measurements which are often irregular in space and time, high dimensional and affected by outliers. For this reason, in this paper we present a joint action segmentation and classification approach based on an extended model: the hidden Markov model for multiple, irregular observations (HMM-MIO). Experiments performed over a concatenated version of the popular KTH action dataset and the challenging CMU multi-modal activity dataset (CMU-MMAC) report accuracies comparable to or higher than those of a bag-of-features approach, showing the usefulness of improved sequential models for joint action segmentation and classification tasks. © 1994-2012 IEEE.
CHAIWONGSAI, J, CHIRACHARIT, W, CHAMNONGTHAI, K, MIYANAGA, Y & HIGUCHI, K 2013, 'A Low Power Tone Recognition for Automatic Tonal Speech Recognizer', IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E96.A, no. 6, pp. 1403-1411.
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Chan, KY, Dillon, T, Lam, HK, Ling, SSH & Nguyen, HT 2013, 'Special issue on hybrid evolutionary systems for manufacturing processes', APPLIED SOFT COMPUTING, vol. 13, no. 3, pp. 1329-1331.
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Cheng, B, Ritz, C, Burnett, I & Zheng, X 2013, 'A General Compression Approach to Multi-Channel Three-Dimensional Audio', IEEE TRANSACTIONS ON AUDIO SPEECH AND LANGUAGE PROCESSING, vol. 21, no. 8, pp. 1676-1688.
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Cheng, P, Chen, Z, Rui, Y, Guo, YJ, Gui, L, Tao, M & Zhang, QT 2013, 'Channel Estimation for OFDM Systems over Doubly Selective Channels: A Distributed Compressive Sensing Based Approach', IEEE Transactions on Communications, vol. 61, no. 10, pp. 4173-4185.
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Channel estimation for an orthogonal frequency-division multiplexing (OFDM) broadband system over a doubly selective channel is very challenging. This is mainly due to the significant Doppler shift, which results in a time-frequency doubly-selective (DS) channel. The DS channel features a large number of channel coefficients, which introduces inter-carrier interference (ICI) and forces the need for allocating a large number of pilot subcarriers. To tackle this problem, in this paper we propose a novel channel estimation scheme based on distributed compressive sensing (DCS) theory. Taking advantage of the basis expansion model (BEM) and the channel sparsity in the delay domain, we transform the original DS channel into a novel two-dimensional channel model, where several jointly sparse BEM coefficient vectors become the estimation goal. Then a special decoupling form originating from a novel sparse pilot pattern is designed for such estimation, which results in an ICI-free structure and enables the DCS application to make joint estimation of these vectors accurately. Combined with a smoothing treatment process, the proposed scheme can achieve significantly higher estimation accuracy than the existing ones, although with a much smaller number of pilot subcarriers. Theoretical analysis and simulation results both confirm its performance merits. © 2013 IEEE.
Chiu, C & Chaczko, Z 2013, 'Enhancement of Surgical Training Practice with the Spring Tensor Heuristic Model', International Journal of Electronics and Telecommunications, vol. 59, no. 3, pp. 237-244.
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Abstract The enhancement of surgical simulation tools is an important research study, to assist in the assessment and feedback of medical training practice. In this research, the Spring Tensor Model (STEM) has been used for laparoscopic end-effector navigation through obstacles and high-risk areas. The modelling of the surgical trainer as part of the laparoscopic simulator seeks to emulate the physical environment as a virtualised representation in the integrated infrastructure. Combining sensor network framework paradigms to a surgical knowledge-based construct demonstrates how STEMcan enhance medical practice. The architectural hybridisation of the training framework has enabled the adaptation of STEM modelling techniques for a simulated laparoscopic training methodology. The primary benefit of the architecture is that this integration strategy has resulted in a seamless transition of the heuristic framework to be applied to surgical training.
Dinh, HT, Lee, C, Niyato, D & Wang, P 2013, 'A survey of mobile cloud computing: architecture, applications, and approaches', Wireless Communications and Mobile Computing, vol. 13, no. 18, pp. 1587-1611.
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ABSTRACTTogether with an explosive growth of the mobile applications and emerging of cloud computing concept, mobile cloud computing (MCC) has been introduced to be a potential technology for mobile services. MCC integrates the cloud computing into the mobile environment and overcomes obstacles related to the performance (e.g., battery life, storage, and bandwidth), environment (e.g., heterogeneity, scalability, and availability), and security (e.g., reliability and privacy) discussed in mobile computing. This paper gives a survey of MCC, which helps general readers have an overview of the MCC including the definition, architecture, and applications. The issues, existing solutions, and approaches are presented. In addition, the future research directions of MCC are discussed. Copyright © 2011 John Wiley & Sons, Ltd.
Dong, X, Liu, E, Yang, J & Wu, Q 2013, 'MEGH: A New Affine Invariant Descriptor', KSII TRANSACTIONS ON INTERNET AND INFORMATION SYSTEMS, vol. 7, no. 7, pp. 1690-1704.
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An affine invariant descriptor is proposed, which is able to well represent the affine covariant regions. Estimating main orientation is still problematic in many existing method, such as SIFT (scale invariant feature transform) and SURF (speeded up robust features). Instead of aligning the estimated main orientation, in this paper ellipse orientation is directly used. According to ellipse orientation, affine covariant regions are firstly divided into 4 sub-regions with equal angles. Since affine covariant regions are divided from the ellipse orientation, the divided sub-regions are rotation invariant regardless the rotation, if any, of ellipse. Meanwhile, the affine covariant regions are normalized into a circular region. In the end, the gradients of pixels in the circular region are calculated and the partition-based descriptor is created by using the gradients. Compared with the existing descriptors including MROGH, SIFT, GLOH, PCA-SIFT and spin images, the proposed descriptor demonstrates superior performance according to extensive experiments. © 2013 KSII.
Du, J, Zhang, T, Guo, YJ & Sun, XW 2013, 'A high-temperature superconducting monolithic microwave integrated Josephson down-converter with high conversion efficiency', Applied Physics Letters, vol. 102, no. 21, pp. 212602-212602.
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A compact high-Tc superconducting monolithic microwave integrated circuit Josephson down-converter is presented. The circuit consists of a single Josephson junction mixer, a bandpass filter, a lowpass filter, and a resonator for local oscillator fabricated on a single 10 mm × 20 mm chip of YBa2Cu3O7−x film on MgO substrate. The down-converter demonstrates superior performance in terms of conversion efficiency, dynamic range, linearity, and low local oscillator power with stable operation from 20 to 77 K. A maximum conversion gain of −4.7 dB was measured at 20 K and −12.8 dB at 70 K.
Du, R, Wu, Q, He, X & Yang, J 2013, 'MIL-SKDE: Multiple-instance learning with supervised kernel density estimation', Signal Processing, vol. 93, no. 6, pp. 1471-1484.
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Multiple-instance learning (MIL) is a variation on supervised learning. Instead of receiving a set of labeled instances, the learner receives a set of bags that are labeled. Each bag contains many instances. The aim of MIL is to classify new bags or instances. In this work, we propose a novel algorithm, MIL-SKDE (multiple-instance learning with supervised kernel density estimation), which addresses MIL problem through an extended framework of KDE (kernel density estimation)+mean shift. Since the KDE+mean shift framework is an unsupervised learning method, we extend KDE to its supervised version, called supervised KDE (SKDE), by considering class labels of samples. To seek the modes (local maxima) of SKDE, we also extend mean shift to a supervised version by taking into account sample labels. SKDE is an alternative of the well-known diverse density estimation (DDE) whose modes are called concepts. Comparing to DDE, SKDE is more convenient to learn multi-modal concepts and robust to labeling noise (mistakenly labeled bags). Finally, each bag is mapped into a concept space where the multi-class SVM classifiers are learned. Experimental results demonstrate that our approach outperforms the state-of-the-art MIL approaches. © 2012 Elsevier B.V.
Du, Y, Lu, DD-C, James, G & Cornforth, DJ 2013, 'Modeling and analysis of current harmonic distortion from grid connected PV inverters under different operating conditions', Solar Energy, vol. 94, pp. 182-194.
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Du, ZS & Watterson, PA 2013, 'Design and implementation of a radial magnetic bearing with permanent magnet bias', Australian Journal of Electrical & Electronics Engineering, vol. 10, no. 2, pp. 167-174.
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A new yoke winding for a radial magnetic bearing with permanent magnet bias fl ux is investigated and shown to reduce the copper loss and copper cost, by 32% in the prototype built. Magnetic circuit analysis neglecting fringing was found to give a poor estimate of the permanent magnet bias fl ux and 3D fi nite element analysis (FEA) would be needed to model it. However, 2D FEA was suffi cient to model the magnetic fi eld and force in the plane of the stator laminations, providing that the correct bias fl ux was imposed as a boundary condition. Solutions for the axial magnetic vector potential component Az were obtained, with a discontinuity prescribed across a cut from the inner to outer domain boundary. A small prototype was built and tested on a shaft whose other end was supported by a ball bearing race with free angular movement. For each of the horizontal and vertical directions, closed loop control was applied with Hall elements providing the shaft position signal. A lead-lag controller, designed using Matlab Simulink and implemented in Turbo Pascal 6, levitated the rotor
Duc, H, Azzi, M, Wahid, H & Ha, QP 2013, 'Background ozone level in the Sydney basin: assessment and trend analysis', INTERNATIONAL JOURNAL OF CLIMATOLOGY, vol. 33, no. 10, pp. 2298-2308.
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It has been recognized that the background ozone concentration in urban areas is changing over the years. This article aims to determine the background ozone level (BOL) using ambient air quality data measurements collected at some monitoring stations in the Sydney basin, Australia. A definition of background ozone in the context of the Sydney region is proposed. With this definition, it is possible to estimate the background ozone using ambient measurements of ozone and its precursors. The trend of the BOL is also estimated from the temporal ambient monitoring records as of early 1998-2005. These ozone level changes at different monitoring stations are assessed using the linear regression method. The results are shown to vary between different monitoring sites. This demonstrates that the local conditions at each site are important in determining as to whether an air quality management plan for reducing the ozone level to below the exceedance level is effective and achievable or not. Furthermore, the results obtained are compared with those obtained by the ClappJenkin method, which is based on the relationship between oxidant and nitrogen oxides, assuming a stationary state of photochemical smog function.
Guo, LS, Li, XY & Kong, XY 2013, 'Analysis on GNSS Receiver with the Principles of Signal and Information', Applied Mechanics and Materials, vol. 328, no. 1, pp. 261-265.
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In the paper, principles of signal and information were introduced to the design of GNSS receiver. Analyze Antenna and radio frequency (RF) front-end with the perspective of transmission link, Understand the baseband processing though signal modulate and demodulate, design the navigation calculation utilized the information pick-up and disposal, and research the receiver system by the inherent connection between signal and information. New ways and means would be developed though these researches.
Ha, QP, Nguyen, MT, Li, J & Kwok, NM 2013, 'Smart Structures With Current-Driven MR Dampers: Modeling and Second-Order Sliding Mode Control', IEEE-ASME TRANSACTIONS ON MECHATRONICS, vol. 18, no. 6, pp. 1702-1712.
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Smart structures are civil or mechanical structures that can automatically and intelligently react to external dynamic loadings such as vibration shocks, strong winds, destructive waves, and earthquakes. The use of magnetorheological (MR) dampers has been of increasing interest in smart structures as they have reliable, stable and fail-safe operations, small energy requirements, and fast responses. The challenges of MR damper structural control rest with the complex dynamics involved, high nonlinearity due to the force-velocity hysteresis, nonaffinity, and constraints of the control system with the magnetization current as its input. To address these problems, this paper presents the modeling and control design as well as the implementation results of a second-order sliding mode controller for the MR dampers embedded in the building structures subject to quake-induced vibrations. Based on the static hysteresis model of the MR damper using computationally tractable algebraic expressions, algorithms are proposed to control directly the magnetization current to the dampers, configured in a differential mode to counteract the offset force. The effectiveness of the proposed technique is verified in simulation by using a building model under quake-like excitations. The experimental results are provided on a laboratorial setup tested on a shake table. © 2013 IEEE.
Hagelstein, B, Abolhasan, M, Franklin, D & Safaei, F 2013, 'Improving fairness in IEEE 802.11 networks using MAC layer opportunistic retransmission', COMPUTER NETWORKS, vol. 57, no. 17, pp. 3410-3427.
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This paper introduces DAFMAC (Decode And Forward MAC), a scalable opportunistic cooperative retransmission enhancement for the IEEE 802.11 MAC protocol which operates without the need for additional explicit control signalling. Distributed opportunistic retransmission algorithms rely on selecting a single suitable relay without direct arbitration between nodes. Simulations show that DAFMAC offers a significant improvement in fairness for both throughput and jitter, giving multiple parallel data flows a more equal opportunity to utilise the channel. DAFMAC cooperative retransmissions are shown to reduce node energy consumption for a given throughput. Further, the DAFMAC relay selection algorithm is shown to scale very well in terms of complexity and memory requirements in comparison to other cooperative retransmission schemes. © 2013 Elsevier B.V. All rights reserved.
Hossain, J, Mahmud, A, Roy, NK & Pota, HR 2013, 'Enhancement of Transient Stability Limit and Voltage Regulation with Dynamic Loads Using Robust Excitation Control', International Journal of Emerging Electric Power Systems, vol. 14, no. 6, pp. 561-570.
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AbstractIn stressed power systems with large induction machine component, there exist undamped electromechanical modes and unstable monotonic voltage modes. This article proposes a sequential design of an excitation controller and a power system stabiliser (PSS) to stabilise the system. The operating region, with induction machines in stressed power systems, is often not captured using a linearisation around an operating point, and to alleviate this situation a robust controller is designed which guarantees stable operation in a large region of operation. A minimax linear quadratic Gaussian design is used for the design of the supplementary control to automatic voltage regulators, and a classical PSS structure is used to damp electromechanical oscillations. The novelty of this work is in proposing a method to capture the unmodelled nonlinear dynamics as uncertainty in the design of the robust controller. Tight bounds on the uncertainty are obtained using this method which enables high-performance controllers. An IEEE benchmark test system has been used to demonstrate the performance of the designed controller.
Hossain, MJ, Saha, TK, Mithulananthan, N & Pota, HR 2013, 'Control Strategies for Augmenting LVRT Capability of DFIGs in Interconnected Power Systems', IEEE Transactions on Industrial Electronics, vol. 60, no. 6, pp. 2510-2522.
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Hu, J, Zhu, J, Lei, G, Platt, G & Dorrell, DG 2013, 'Multi-Objective Model-Predictive Control for High-Power Converters', IEEE TRANSACTIONS ON ENERGY CONVERSION, vol. 28, no. 3, pp. 652-663.
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This paper presents a multi-objective model-predictive control (MOMPC) strategy for controlling converters in high-power applications. The controller uses the system model to predict the system behavior in each sampling interval for each voltage vector,
Hu, J, Zhu, J, Zhang, Y, Platt, G, Ma, Q & Dorrell, DG 2013, 'Predictive Direct Virtual Torque and Power Control of Doubly Fed Induction Generators for Fast and Smooth Grid Synchronization and Flexible Power Regulation', IEEE TRANSACTIONS ON POWER ELECTRONICS, vol. 28, no. 7, pp. 3182-3194.
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Predictive direct torque control of the electric motors has been well developed. It is simple and has excellent steady state and transient performance. However, further developments are still under investigation for applications in the field of power generation. This paper presents a predictive direct virtual torque and power control strategy for a doubly fed induction generator, which allows fast and smooth grid synchronization, and flexible active and reactive power regulation. In the no-load mode, predictive direct virtual torque control is employed to meet the grid synchronization conditions. In the grid-connected mode, predictive direct power control is utilized to achieve flexible active and reactive power regulation. To simplify the control system structure and improve the reliability, a sensorless rotor position scheme is proposed. Furthermore, a model-based predictive scheme is introduced to compensate for a one-step delay in the digital implementation. The proposed control strategy is very simple and robust. There is constant switching frequency, while the requirement of smooth and fast grid synchronization is fulfilled. The transition from no load to flexible power regulation is achieved without changing the switching table. The proposed control strategy was tested by simulation using MATLAB/Simulink and experimentally validated on a 20-kW laboratory prototype.
Huang, Y & Huang, X 2013, 'Detection of Temporally Correlated Signals over Multipath Fading Channels', IEEE Transactions on Wireless Communications, vol. 12, no. 3, pp. 1290-1299.
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An optimal detection method along with two reduced-complexity methods, modified energy detection (MED) and equal gain detection (EGD), under low signal-to-noise ratio (SNR) condition are proposed in this paper for detection of temporally correlated signals over multipath fading channels. By incorporating resolvable multipaths and multiple antennas into system model, these detection methods are derived based on maximum log-likelihood ratio (LLR) test principal and using the same low SNR LLR approximation. Analytical performance expressions for MED and EGD are also given. Simulation results show that, when signal exhibits temporal correlation, the proposed optimal detection and EGD achieve better performance than conventional generalized likelihood ratio test through utilizing multipath propagation. Further, the proposed MED is superior to conventional energy detection if it a priori signal temporal correlation information is exploited. It is also revealed that multipath tap correlation can have either constructive or destructive effect to spectrum sensing. The proposed EGD is proven to be a practical technique for reliable spectrum sensing over multipath fading channels as it approaches optimal performance with low complexity. © 2002-2012 IEEE.
Hussain, S, Basu, A, Wang, R & Hamilton, TJ 2013, 'Delay Learning Architectures for Memory and Classification', Neurocomputing, vol. 138, pp. 14-26.
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We present a neuromorphic spiking neural network, the DELTRON, that canremember and store patterns by changing the delays of every connection asopposed to modifying the weights. The advantage of this architecture overtraditional weight based ones is simpler hardware implementation withoutmultipliers or digital-analog converters (DACs) as well as being suited totime-based computing. The name is derived due to similarity in the learningrule with an earlier architecture called Tempotron. The DELTRON can remembermore patterns than other delay-based networks by modifying a few delays toremember the most 'salient' or synchronous part of every spike pattern. Wepresent simulations of memory capacity and classification ability of theDELTRON for different random spatio-temporal spike patterns. The memorycapacity for noisy spike patterns and missing spikes are also shown. Finally,we present SPICE simulation results of the core circuits involved in areconfigurable mixed signal implementation of this architecture.
Iacopi, F, Brock, RE, Iacopi, A, Hold, L & Dauskardt, RH 2013, 'Evidence of a highly compressed nanolayer at the epitaxial silicon carbide interface with silicon', Acta Materialia, vol. 61, no. 17, pp. 6533-6540.
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Iacopi, F, Walker, G, Wang, L, Malesys, L, Ma, S, Cunning, BV & Iacopi, A 2013, 'Orientation-dependent stress relaxation in hetero-epitaxial 3C-SiC films', Applied Physics Letters, vol. 102, no. 1, pp. 011908-011908.
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Residual stresses in epitaxial 3C-SiC films on silicon, for chosen growth conditions, appear determined by their growth orientation. Stress evaluation locally with Raman spectroscopy, and across a 150 mm wafer with curvature measurements, indicate that thin films can be grown on Si(100) with residual tensile stresses as low as 150 MPa. However, films on Si(111) retain a considerably higher stress, around 900 MPa, with only minor decrease versus film thickness. Stacking faults are indeed geometrically a less efficient relief mechanism for the biaxial strain of SiC films grown on Si(111) with 〈111〉 orientation. Residual stresses can be tuned by the epitaxial process temperatures.
Islam, MR, Guo, Y & Zhu, J 2013, 'A medium frequency transformer with multiple secondary windings for medium voltage converter based wind turbine power generating systems', Journal of Applied Physics, vol. 113, no. 17, pp. 17A324-17A324.
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Recent advances in magnetic materials have led to the development of compact and light weight, medium and high frequency transformers, which would be a possible solution to reducing the size and weight of wind turbine power generating systems. This paper presents the overall design and analysis of a Metglas amorphous alloy 2605SA1 based medium frequency transformer to generate the isolated balanced multiple DC supplies for medium voltage converter systems. A comprehensive electromagnetic analysis is conducted on the proposed design based on experimental results. The test stand, data analysis, and test results are discussed.
Iwaizumi, H, Yoshizawa, S & Miyanaga, Y 2013, 'A High-Speed and Low-Energy-Consumption Processor for SVD-MIMO-OFDM Systems', VLSI Design, vol. 2013, pp. 1-10.
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A processor design for singular value decomposition (SVD) and compression/decompression of feedback matrices, which are mandatory operations for SVD multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) systems, is proposed and evaluated. SVD-MIMO is a transmission method for suppressing multistream interference and improving communication quality by beamforming. An application specific instruction-set processor (ASIP) architecture is adopted to achieve flexibility in terms of operations and matrix size. The proposed processor realizes a high-speed/low-power design and real-time processing by the parallelization of floating-point units (FPUs) and arithmetic instructions specialized in complex matrix operations.
Jamdagni, A, Tan, Z, He, X, Nanda, P & Liu, RP 2013, 'RePIDS: A multi tier Real-time Payload-based Intrusion Detection System', Computer Networks, vol. 57, no. 3, pp. 811-824.
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Intrusion Detection System (IDS) deals with huge amount of network traffic and uses large feature set to discriminate normal pattern and intrusive pattern. However, most of existing systems lack the ability to process data for real-time anomaly detection. In this paper, we propose a 3-Tier Iterative Feature Selection Engine (IFSEng) for feature subspace selection. Principal Component Analysis (PCA) technique is used for the pre-processing of data. Mahalanobis Distance Map (MDM) is used to discover hidden correlations between the features and between the packets. We also propose a novel Real-time Payload-based Intrusion Detection System (RePIDS) that integrates a 3-Tier IFSEng and the MDM approach. Mahalanobis Distance (MD) dissimilarity criterion is used to classify each packet as either a normal or an attack packet. The effectiveness of the proposed RePIDS is evaluated using DARPA 99 dataset and Georgia Institute of Technology attack dataset. The traffic for Web-based application is considered for validating our model. F-value, a criterion, is used to evaluate the detection performance of RePIDS. Experimental results show that RePIDS achieves better performance (high F-values, 0.9958 for DARPA 99 dataset and 0.976 for Georgia Institute of Technology attack dataset respectively, with only 0.85% false alarm rate) and lower computational complexity when compared against two state-of-the-art payload-based intrusion detection systems. Additionally, it has 1.3 time higher throughput in comparison with real scenario of medium sized enterprise network. © 2012 Elsevier B.V. All rights reserved.
Kabir, SMR, Rahman, BMA, Agrawal, A & Grattan, KTV 2013, 'ELIMINATION OF NUMERICAL DISPERSION FROM ELECTROMAGNETIC TIME DOMAIN ANALYSIS BY USING RESOURCE EFFICIENT FINITE ELEMENT TECHNIQUE', Progress In Electromagnetics Research, vol. 137, pp. 487-512.
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Kale, A, Chaczko, Z & Rudas, I 2013, 'Managing Dynamism of Multimodal Detection in Machine Vision Using Selection of Phenotypes', Computer Aided Systems Theory -- EUROCAST 2013, vol. 8112, no. 1, pp. 483-490.
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Multimodal Sensor Vision is a technique for detecting objects in dynamic and uncertain environmental conditions. In this research, a new approach for automated feature subset selection-mechanism is proposed that combines a set of features acquired from multiple sensors. Based on changing environmental conditions, the merits of respective sensory data can be assessed and the feature subset optimized, using genetic operators. Genetic Algorithms (GAs) with problem specific modifications improve reliability and adaptability of the detection process. In the new approach, a traditional GA is customized by combining the problem profiled encoding with a specialized operator. Application of an additional operator prioritizes and switches within the feature subsets of the algorithm, allowing a feature level aggregation that uses the most prominent features. The approach offers a more robust and a better performing Machine Vision processing.
Karadag, Y, Aas, M, Jonáš, A, Anand, S, McGloin, D & Kiraz, A 2013, 'Dye lasing in optically manipulated liquid aerosols', Optics Letters, vol. 38, no. 10, pp. 1669-1669.
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Keshavarz, R & Movahhedi, M 2013, 'A compact and wideband coupled-line coupler with high coupling level using shunt periodic stubs', Radioengineering, vol. 22, no. 1, pp. 323-327.
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A wideband microstrip forward-wave coupledline coupler with high coupling value is presented. Compared with the conventional edge-coupled microstrip forward-wave coupler, this symmetrical structure, consisting periodic shunt stubs between the two coupled-lines, achieves wider operating bandwidth and larger coupling level. To characterize this structure, the equivalent circuit model is established and verified by measurement and fullwave results. The designed and fabricated prototype is a 0-dB forward-wave coupler with 0.6 mm stub length. This coupler exhibits a coupled amplitude balance of ±2 dB, good matching (15 dB) and at least 15dB isolation between adjacent ports over a wide bandwidth of 66% from 2 GHz to 4 GHz centered at 3 GHz. The coupled-line length and width of the proposed structure are approximately λg/2 and λg/13, respectively, which makes it more compact than the conventional forward coupled-line couplers.
Keshavarz, R, Mohammadi, A & Abdipour, A 2013, 'A Quad-Band Distributed Amplifier With E-CRLH Transmission Line', IEEE Transactions on Microwave Theory and Techniques, vol. 61, no. 12, pp. 4188-4194.
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Kha, HH, Tuan, HD & Nguyen, HH 2013, 'Joint Optimization of Source Power Allocation and Cooperative Beamforming for SC-FDMA Multi-User Multi-Relay Networks', IEEE Transactions on Communications, vol. 61, no. 6, pp. 2248-2259.
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This paper is concerned with design problems of joint source power allocation and relay beamforming in multiuser multi-relay networks that use single-carrier frequency division multiple access (SC-FDMA) and amplify-and-forward relaying. Examined are the
Kha, HH, Tuan, HD, Nguyen, HH & Pham, TT 2013, 'Optimization of Cooperative Beamforming for SC-FDMA Multi-User Multi-Relay Networks by Tractable D.C. Programming', IEEE Transactions on Signal Processing, vol. 61, no. 2, pp. 467-479.
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This paper addresses the optimal cooperative beamforming design for multi-user multi-relay wireless networks in which the single-carrier frequency division multiple access (SC-FDMA) technique is employed at the terminals. The problem of interest is to find the beamforming weights across relays to maximize the minimum signal-to-interference-plus-noise ratio (SINR) among source users subject to individual power constraints at each relay. Such a beamforming design is shown to be a hard nonconvex optimization problem and therefore it is mathematically challenging to find the optimal solution. By exploring its partial convex structures, we recast the design problem as minimization of a d.c. (difference of two convex) objective function subject to convex constraints and develop an effective iterative algorithm of low complexity to solve it. Simulation results show that our optimal cooperative beamforming scheme realizes the inherent diversity order of the relay network and it performs significantly better than the equal-power beamforming weights.
Ki, S-K & Lu, DD-C 2013, 'A High Step-Down Transformerless Single-Stage Single-Switch AC/DC Converter', IEEE Transactions on Power Electronics, vol. 28, no. 1, pp. 36-45.
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Klejsa, J, Zhang, G, Li, M & Kleijn, WB 2013, 'Multiple Description Distribution Preserving Quantization', IEEE Transactions on Signal Processing, vol. 61, no. 24, pp. 6410-6422.
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Kusakunniran, W, Wu, Q, Zhang, J, Ma, Y & Li, H 2013, 'A New View-Invariant Feature for Cross-View Gait Recognition', IEEE Transactions on Information Forensics and Security, vol. 8, no. 10, pp. 1642-1653.
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Human gait is an important biometric feature which is able to identify a person remotely. However, change of view causes significant difficulties for recognizing gaits. This paper proposes a new framework to construct a new view-invariant feature for cross-view gait recognition. Our view-normalization process is performed in the input layer (i.e., on gait silhouettes) to normalize gaits from arbitrary views. That is, each sequence of gait silhouettes recorded from a certain view is transformed onto the common canonical view by using corresponding domain transformation obtained through invariant low-rank textures (TILTs). Then, an improved scheme of procrustes shape analysis (PSA) is proposed and applied on a sequence of the normalized gait silhouettes to extract a novel view-invariant gait feature based on procrustes mean shape (PMS) and consecutively measure a gait similarity based on procrustes distance (PD). Comprehensive experiments were carried out on widely adopted gait databases. It has been shown that the performance of the proposed method is promising when compared with other existing methods in the literature.
Kwok, NM, Shi, HY, Ha, QP, Fang, G, Chen, SY & Jia, X 2013, 'Simultaneous image color correction and enhancement using particle swarm optimization', ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE, vol. 26, no. 10, pp. 2356-2371.
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Color images captured under various environments are often not ready to deliver the desired quality due to adverse effects caused by uncontrollable illumination settings. In particular, when the illuminate color is not known a priori, the colors of the objects may not be faithfully reproduced and thus impose difficulties in subsequent image processing operations. Color correction thus becomes a very important pre-processing procedure where the goal is to produce an image as if it is captured under uniform chromatic illumination. On the other hand, conventional color correction algorithms using linear gain adjustments focus only in color manipulations and may not convey the maximum information contained in the image. This challenge can be posed as a multi-objective optimization problem that simultaneously corrects the undesirable effect of illumination color cast while recovering the information conveyed from the scene. A variation of the particle swarm optimization algorithm is further developed in the multi-objective optimization perspective that results in a solution achieving a desirable color balance and an adequate delivery of information. Experiments are conducted using a collection of color images of natural objects that were captured under different lighting conditions. Results have shown that the proposed method is capable of delivering images with higher quality.
Laird, I & Lu, DD-C 2013, 'High Step-Up DC/DC Topology and MPPT Algorithm for Use With a Thermoelectric Generator', IEEE Transactions on Power Electronics, vol. 28, no. 7, pp. 3147-3157.
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Le, LB, Niyato, D, Hossain, E, Kim, DI & Hoang, DT 2013, 'QoS-Aware and Energy-Efficient Resource Management in OFDMA Femtocells', IEEE Transactions on Wireless Communications, vol. 12, no. 1, pp. 180-194.
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Lei, G, Zhu, JG, Guo, YG, Hu, JF, Xu, W & Shao, KR 2013, 'Robust Design Optimization of PM-SMC Motors for Six Sigma Quality Manufacturing', IEEE TRANSACTIONS ON MAGNETICS, vol. 49, no. 7, pp. 3953-3956.
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In our previous work, soft magnetic composite (SMC) material was employed to design cores for two kinds of permanent magnet (PM) motors, namely transverse flux machine (TFM) and claw pole motor. Compared with motors designed by traditional silicon steel
Leijdekkers, P & Gay, V 2013, 'Mobile apps for chronic disease management: lessons learned from myFitnessCompanion®', Health and Technology, vol. 3, no. 2, pp. 111-118.
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Nowadays, many health and fitness applications (apps) can be downloaded from app stores, changing the way people manage their health and chronic diseases. This paper reflects on 7 years of experience in mobile health and fitness app development. It analyzes the uptake of a health and fitness app, myFitnessCompanion®, by the healthcare industry and end-users dealing with chronic disease management. The use of myFitnessCompanion® is analyzed from an end-user perspective. The app is available via Google Play since February 2011 and the research presented is based on data collected from 5500+ users over a period of 7 months. The paper also discusses how mHealth apps could be distributed in the near future, as well as, the use of Personal Health Record (PHR) systems such as Microsoft HealthVault, and the impact of regulations on the future of mHealth apps. The conclusion highlights the challenges and opportunities for app developers in the mHealth industry
Lek, HS, Morrison, VL, Conneely, M, Campbell, PA, McGloin, D, Kliche, S, Watts, C, Prescott, A & Fagerholm, SC 2013, 'The Spontaneously Adhesive Leukocyte Function-associated Antigen-1 (LFA-1) Integrin in Effector T Cells Mediates Rapid Actin- and Calmodulin-dependent Adhesion Strengthening to Ligand under Shear Flow', Journal of Biological Chemistry, vol. 288, no. 21, pp. 14698-14708.
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Li, K, Safavi-Naeini, M, Franklin, DR, Petasecca, M, Guatelli, S, Rosenfeld, AB, Hutton, BF & Lerch, MLF 2013, 'A feasibility study of PETiPIX: an ultra high resolution small animal PET scanner', JOURNAL OF INSTRUMENTATION, vol. 8, no. 12, pp. 1-15.
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PETiPIX is an ultra high spatial resolution positron emission tomography (PET) scanner designed for imaging mice brains. Four Timepix pixellated silicon detector modules are placed in an edge-on configuration to form a scanner with a field of view (FoV) 15 mm in diameter. Each detector module consists of 256 × 256 pixels with dimensions of 55 × 55 × 300 µm3. Monte Carlo simulations using GEANT4 Application for Tomographic Emission (GATE) were performed to evaluate the feasibility of the PETiPIX design, including estimation of system sensitivity, angular dependence, spatial resolution (point source, hot and cold phantom studies) and evaluation of potential detector shield designs. Initial experimental work also established that scattered photons and recoil electrons could be detected using a single edge-on Timepix detector with a positron source. Simulation results estimate a spatial resolution of 0.26 mm full width at half maximum (FWHM) at the centre of FoV and 0.29 mm FWHM overall spatial resolution with sensitivity of 0.01%, and indicate that a 1.5 mm thick tungsten shield parallel to the detectors will absorb the majority of non-coplanar annihilation photons, significantly reducing the rates of randoms. Results from the simulated phantom studies demonstrate that PETiPIX is a promising design for studies demanding high resolution images of mice brains.
Li, X, Guo, L, Kong, X & Gao, S 2013, 'Conflicts Analysis and Validation of Inertial Sensors Aided Global Positioning System Carrier Tracking Loop', Sensor Letters, vol. 11, no. 5, pp. 805-811.
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Considering that the GPS carrier tracking loop is fragile in high dynamic and weak signal environments, carrier tracking loop with information aided from inertial sensors is designed in this paper. The conflicts between loop noise and dynamic stress are analyzed, which are existed in the bandwidth design of carrier tracking loop. To address this problem, the information of inertial sensors is brought to the carrier loop design, which takes advantage of the relation between relative motion and Doppler frequency shift. Simulation results indicate the inertial sensors aided tracking loop could improve the performance of anti-interference and anti-dynamic significantly.
Li, Y, Jia, W, Shen, C & Hengel, AVD 2013, 'Characterness: An Indicator of Text in the Wild', IEEE Transactions on Image Processing, vol. 23, no. 4, pp. 1666-1677.
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Text in an image provides vital information for interpreting its contents,and text in a scene can aide with a variety of tasks from navigation, toobstacle avoidance, and odometry. Despite its value, however, identifyinggeneral text in images remains a challenging research problem. Motivated by theneed to consider the widely varying forms of natural text, we propose abottom-up approach to the problem which reflects the `characterness' of animage region. In this sense our approach mirrors the move from saliencydetection methods to measures of `objectness'. In order to measure thecharacterness we develop three novel cues that are tailored for characterdetection, and a Bayesian method for their integration. Because text is made upof sets of characters, we then design a Markov random field (MRF) model so asto exploit the inherent dependencies between characters. We experimentally demonstrate the effectiveness of our characterness cues aswell as the advantage of Bayesian multi-cue integration. The proposed textdetector outperforms state-of-the-art methods on a few benchmark scene textdetection datasets. We also show that our measurement of `characterness' issuperior than state-of-the-art saliency detection models when applied to thesame task.
Liu, C, Zhu, J, Li, J, Wang, S, Qiu, J, Shi, Q, Liu, J, Zhong, L & Zhu, J 2013, 'Functional Magnetic Stimulation System and Pulsed Magnetic-Field Effect on Peripheral Nerve', IEEE Transactions on Magnetics, vol. 49, no. 5, pp. 1853-1856.
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This paper studies a pulsed magnetic-field generator which provides a noncontact way for functional nerve stimulation. Each component of the device, such as charging circuit, discharging circuit, and control circuit, is described in detail. The feasibili
Liu, J, Esselle, KP, Hay, SG & Zhong, SS 2013, 'Compact super‐wideband asymmetric monopole antenna with dual‐branch feed for bandwidth enhancement', Electronics Letters, vol. 49, no. 8, pp. 515-516.
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Liu, J, Esselle, KP, Hay, SG, Sun, Z & Zhong, S 2013, 'A Compact Super-Wideband Antenna Pair With Polarization Diversity', IEEE Antennas and Wireless Propagation Letters, vol. 12, pp. 1472-1475.
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Liu, JJ, Esselle, KP, Hay, SG & Zhong, SS 2013, 'Planar ultra‐wideband antenna with five notched stop bands', Electronics Letters, vol. 49, no. 9, pp. 579-580.
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Liu, RP, Sutton, GJ & Collings, IB 2013, 'Errata to the paper 'A New Queueing Model for QoS Analysis of IEEE 802.11 DCF with Finite Buffer and Load' [Aug 10 2664-2675]', IEEE Transactions on Wireless Communications, vol. 12, no. 10, pp. 5374-5374.
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López-Mariscal, C & McGloin, D 2013, 'Introduction: Optical trapping and applications feature issue', Biomedical Optics Express, vol. 4, no. 11, pp. 2710-2710.
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Lu, DD-C & Ki, S-K 2013, 'Light-Load Efficiency Improvement in Buck-Derived Single-Stage Single-Switch PFC Converters', IEEE Transactions on Power Electronics, vol. 28, no. 5, pp. 2105-2110.
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Lu, S, Zhang, J, Wang, Z & Feng, DD 2013, 'Fast human action classification and VOI localization with enhanced sparse coding', Journal of Visual Communication and Image Representation, vol. 24, no. 2, pp. 127-136.
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Sparse coding which encodes the natural visual signal into a sparse space for visual codebook generation and feature quantization, has been successfully utilized for many image classification applications. However, it has been seldom explored for many video analysis tasks. In particular, the increased complexity in characterizing the visual patterns of diverse human actions with both the spatial and temporal variations imposes more challenges to the conventional sparse coding scheme. In this paper, we propose an enhanced sparse coding scheme through learning discriminative dictionary and optimizing the local pooling strategy. Localizing when and where a specific action happens in realistic videos is another challenging task. By utilizing the sparse coding based representations of human actions, this paper further presents a novel coarse-to-fine framework to localize the Volumes of Interest (VOIs) for the actions. Firstly, local visual features are transformed into the sparse signal domain through our enhanced sparse coding scheme. Secondly, in order to avoid exhaustive scan of entire videos for the VOI localization, we extend the Spatial Pyramid Matching into temporal domain, namely Spatial Temporal Pyramid Matching, to obtain the VOI candidates. Finally, a multi-level branch-and-bound approach is developed to refine the VOI candidates. The proposed framework is also able to avoid prohibitive computations in local similarity matching (e.g., nearest neighbors voting). Experimental results on both two popular benchmark datasets (KTH and YouTube UCF) and the widely used localization dataset (MSR) demonstrate that our approach reduces computational cost significantly while maintaining comparable classification accuracy to that of the state-of-the-art methods. © 2012 Elsevier Inc. All rights reserved.
Ma, S, Wang, S, Iacopi, F & Huang, H 2013, 'A resonant method for determining the residual stress and elastic modulus of a thin film', Applied Physics Letters, vol. 103, no. 3, pp. 031603-031603.
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By measuring the resonant frequencies of the first two symmetric vibration modes of a circular thin-film diaphragm and solving the Rayleigh-Ritz equation analytically, the residual stress and elastic modulus of the film were determined simultaneously. The results obtained employing this method are in excellent agreement with those obtained numerically in finite element modelling when tested using freestanding circular SiC diaphragms with residual tensile stress. The stress and modulus values are also in reasonably good agreement with those obtained from nanoindentation and wafer curvature measurements, respectively.
Mahmud, MA, Hossain, MJ & Pota, HR 2013, 'Effects of large dynamic loads on power system stability', International Journal of Electrical Power & Energy Systems, vol. 44, no. 1, pp. 357-363.
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Mahmud, MA, Pota, HR & Hossain, MJ 2013, 'Nonlinear DSTATCOM controller design for distribution network with distributed generation to enhance voltage stability', International Journal of Electrical Power & Energy Systems, vol. 53, pp. 974-979.
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Masihpour, M, Franklin, DR & Abolhasan, M 2013, 'Multihop Relay Techniques for Communication Range Extension in Near-Field Magnetic Induction Communication Systems.', J. Networks, vol. 8, no. 5, pp. 999-1011.
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In this paper, multihop relaying in RF-based communications and near field magnetic induction communication (NFMIC) is discussed. Three multihop relay strategies for NFMIC are proposed: Non Line of Sight Magnetic Induction Relay (NLoS-MI Relay), Non Line of Sight Master/Assistant Magnetic Induction Relay1 (NLoS-MAMI Relay1) and Non Line of Sight Master/Assistant Magnetic Induction Relay2 (NLoSMAMI Relay2). In the first approach only one node contributes to the communication, while in the other two techniques (which are based on a master-assistant strategy), two relaying nodes are employed. This paper shows that these three techniques can be used to overcome the problem of dead spots within a body area network and extend the communication range without increasing the transmission power and the antenna size or decreasing receiver sensitivity. The impact of the separation distance between the nodes on the achievable RSS and channel data rate is evaluated for the three techniques. It is demonstrated that the technique which is most effective depends on the specific network topology. Optimum selection of nodes as relay master and assistant based on the location of the nodes is discussed. The paper also studies the impact of the quality factor on achievable data rate. It is shown that to obtain the highest data rate, the optimum quality factor needs to be determined for each proposed cooperative communication method.
McDonald, C, McPherson, M, McDougall, C & McGloin, D 2013, 'HoloHands: games console interface for controlling holographic optical manipulation', Journal of Optics, vol. 15, no. 3, pp. 035708-035708.
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Minasian, AA & Bird, TS 2013, 'Particle Swarm Optimization of Microstrip Antennas for Wireless Communication Systems', IEEE Transactions on Antennas and Propagation, vol. 61, no. 12, pp. 6214-6217.
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Particle swarm optimization (PSO) is applied as a design tool for a parasitically coupled microstrip antenna array. The antenna is characterized by a unique non intuitive design which results from an application of PSO with no constraints implemented on the shape of the array during optimization apart from the maximum dimensions. The design incorporating passive parasitically coupled sub patches is described for the IEEE 802.11a WLAN 5-6 GHz band to achieve a reflection coefficient of < an omnidirectional radiation pattern and satisfactory gain. The design was fabricated and experimental results obtained that confirm the simulations. © 2013 IEEE.
MIYANAGA, Y, TAKAHASHI, W & YOSHIZAWA, S 2013, 'A Robust Speech Communication into Smart Info-Media System', IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E96.A, no. 11, pp. 2074-2080.
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Movassaghi, S, Abolhasan, M & Lipman, J 2013, 'A Review of Routing Protocols in Wireless Body Area Networks', Journal of Networks, vol. 8, no. 3, pp. 559-575.
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Recent technological advancements in wireless communication, integrated circuits and Micro-Electro-Mechanical Systems (MEMs) has enabled miniaturized, low-power, intelligent, invasive/ non-invasive micro and nano-technology sensor nodes placed in or on the human body for use in monitoring body function and its immediate environment referred to as Body Area Networks (BANs). BANs face many stringent requirements in terms of delay, power, temperature and network lifetime which need to be taken into serious consideration in the design of different protocols. Since routing protocols play an important role in the overall system performance in terms of delay, power consumption, temperature and so on, a thorough study on existing routing protocols in BANs is necessary. Also, the specific challenges of BANs necessitates the design of new routing protocols specifically designed for BANs. This paper provides a survey of existing routing protocols mainly proposed for BANs. These protocols are further classified into five main categories namely, temperature based, cross-layer, cluster based, cost-effective and QoS-based routing, where each protocol is described under its specified category. Also, comparison among routing protocols in each category is given. © 2013 ACADEMY PUBLISHER.
Ni, W, Collings, IB & Liu, RP 2013, 'Decentralized User-Centric Scheduling with Low Rate Feedback for Mobile Small Cells', IEEE Transactions on Wireless Communications, vol. 12, no. 12, pp. 6106-6120.
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Small cells with wireless backhaul are promising, whereas challenges of severe overlapping coverage and strong interference are yet to be addressed. Coordinating small cells could resolve the challenges; however, existing multicell coordinated beamforming techniques involve high cost of communication overhead, synchronization and backhaul. Such problems may deteriorate in practical cellular applications, where there could be many users, each generating high channel feedback overhead to compete for an opportunity of being scheduled, and the downlink data signals of the coordinated cells need to be precisely synchronized at each of the users. We propose a new scheme, which cuts the overhead by 80% and enables the coordination to be practically implemented in a decentralized manner. Our scheme is a user-centric downlink scheduling approach, where mobile terminals trigger and participate in the scheduling decisions of small cells. We also develop a new recursive algorithm to optimize the quantization levels of mobile terminals' feedback, minimizing the feedback requirement. Analysis, confirmed by simulations, shows that our scheme is able to achieve 94.4% of the sum-rate upper-bound which can only be approached by idealized centralized coordination. In terms of throughput, given the 80% reduced overhead, our scheme is 139.5% better than the idealized centralized coordination approach. © 2013 IEEE.
OBAIDULLAH, K, SIRITEANU, C, YOSHIZAWA, S & MIYANAGA, Y 2013, 'Effects of Channel Features on Parameters of Genetic Algorithm for MIMO Detection', IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E96.A, no. 10, pp. 1984-1992.
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Pham, HN, Fujita, H, Ozaki, K & Uchida, N 2013, 'Dynamic Analysis and Control for Resonant Currents in a Zone-Control Induction Heating System', IEEE Transactions on Power Electronics, vol. 28, no. 3, pp. 1297-1307.
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This paper presents a quick and accurate power control method for a zone-control induction heating (ZCIH) system consisting of multiple working coils connected to multiple H-bridge inverters. A uniform temperature profile can be achieved by adjusting the current in each working coil. This paper proposes a new current control method based on a circuit model using real and imaginary (Re-Im) current/voltage components. The method detects and controls the Re-Im components of the coil current instead of the current amplitude and phase angle. As a result, the proposed method enables the inverters to control the coil current independently from the others. Experiments using a six-coil ZCIH system are conducted to verify the validity of the proposed method. The experimental results confirmed that the proposed method makes it possible to improve the stability of the current feedback control, not only in steady states but also in transient states.
Pham, TT, Nguyen, HH & Tuan, HD 2013, 'Optimization of Hierarchical Modulation for Decode-and-Forward Wireless Relay Networks', IEEE Transactions on Vehicular Technology, vol. 62, no. 9, pp. 4484-4493.
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This paper presents two designs of optimal nonuniformed constellations for decode-and-forward wireless relay networks with an orthogonal space-time block code (STBC). The first design is concerned with the unequal error protection issue, in which two dat
Phan, AH, Tuan, HD, Kha, HH & Nguyen, HH 2013, 'Iterative D.C. Optimization of Precoding in Wireless MIMO Relaying', IEEE Transactions on Wireless Communications, vol. 12, no. 4, pp. 1617-1627.
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Optimizations of precoding matrices in precode-and-forward (PF) MIMO relaying are nonconvex programs in precoding matrix variables. The semidefinite relaxation (SDR) technique, which relaxes the concerned nonconvex quadratic constraints by (convex) semi-definite ones, can locate the optimal solutions, provided that the numbers of relaying antennas and users are very small. The computational complexity of the SDR grows explosively even with a very moderate increase in the numbers of relaying antennas and/or users, making the existing semidefinite programming (SDP) solvers incapable. In this paper, much more efficient problem formulations of precoding matrix design that exploit the spectral matrix optimization are developed. Such formulations have a low dimensionality and are computationally-tractable nonconvex matrix programs. Furthermore, by exploiting their partial convex structures in the d.c. (difference of two convex functions) framework, new effective iterative solutions are obtained. Extensive simulation results are presented to support the computational advantage of the proposed approach and show that the proposed approach can effectively handle all three considered optimization problems of precoding matrices in MIMO PF relaying, while the SDR approach either is computationally impractical or fails.
Power, R, Reid, JP, Anand, S, McGloin, D, Almohammedi, A, Mistry, NS & Hudson, AJ 2013, 'Correction to “Observation of the Binary Coalescence and Equilibration of Micrometer-Sized Droplets of Aqueous Aerosol in a Single-Beam Gradient-Force Optical Trap”', The Journal of Physical Chemistry A, vol. 117, no. 2, pp. 524-524.
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Qin, P-Y, Guo, YJ & Ding, C 2013, 'A Beam Switching Quasi-Yagi Dipole Antenna', IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. 61, no. 10, pp. 4891-4899.
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A high gain beam switching pattern reconfigurable quasi-Yagi dipole antenna is presented for wireless local area network (WLAN) systems at 5.2 GHz. The antenna consists of a microstrip-to-coplanar stripline (CPS) balun, the length of which can be controlled by using PIN diodes. The change of the length of the balun allows the currents on the two arms of the dipole to have different phase differences, thereby making the antenna operate at three states with the E-plane maximum beam direction towards 20°, -20°, and 0°, respectively. In order to validate the design method, a prototype of the proposed antenna with a practical biasing network was fabricated and measured. Measured results on the reflection coefficients, radiation patterns, and realized gains for three operating states are provided, which agree well with the numerical simulations. © 1963-2012 IEEE.
Qin, P-Y, Guo, YJ & Ding, C 2013, 'A Dual-Band Polarization Reconfigurable Antenna for WLAN Systems', IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. 61, no. 11, pp. 5706-5713.
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A new microstrip dual-band polarization reconfigurable antenna is presented for wireless local area network (WLAN) systems operating at 2.4 and 5.8 GHz. The antenna consists of a square microstrip patch that is aperture coupled to a microstrip line located along the diagonal line of the patch. The dual-band operation is realized by employing the TM10 and TM30 modes of the patch antenna. Four shorting posts are inserted into the patch to adjust the frequency ratio of the two modes. The center of each edge of the patch is connected to ground via a PIN diode for polarization switching. By switching between the different states of PIN diodes, the proposed antenna can radiate either horizontal, vertical, or 45° linear polarization in the two frequency bands. Measured results on reflection coefficients and radiation patterns agree well with numerical simulations. © 1963-2012 IEEE.
Qu, Z, Wang, J, Xu, M & Lu, H 2013, 'Context-Aware Video Retargeting via Graph Model', IEEE Transactions on Multimedia, vol. 15, no. 7, pp. 1677-1687.
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Video retargeting is a crowded but challenging research area. In order to maximally comfort the viewers' watching experience, the most challenging issue is how to retain the spatial shape of important objects while ensure temporal smoothness and coherence. Existing retargeting techniques deal with these spatialoral requirements individually, which preserve the spatial geometry and temporal coherence for each region. However, the spatialoral property of the video content should be context-relevant, i.e., the regions belonging to the same object are supposed to undergo uniform spatialoral transformation. Regardless of the contextual information, the divide-and-rule strategy of existing techniques usually incurs various spatialoral artifacts. In order to achieve satisfactory spatialoral coherent video retargeting, in this paper, a novel context-aware solution is proposed via graph model. First, we employ a grid-based warping framework to preserve the spatial structure and temporal motion trend at the unit of grid cell. Second, we propose a graph-based motion layer partition algorithm to estimate motions of different regions, which simultaneously provides the evaluation of contextual relationship between grid cells while estimating the motions of regions. Third, complementing the salience-based spatialoral information preservation, two novel context constraints are encoded for encouraging the grid cells of the same object to undergo uniform spatial and temporal transformation, respectively. Finally, we formulate the objective function as a quadratic programming problem. Our method achieves a satisfactory spatialoral coherence while maximally avoiding the influence of artifacts. In addition, the grid-cell-wise motion estimation could be calculated every few frames, which obviously improves the speed. Experimental results and comparisons with state-of-the-art methods demonstrate the effectiveness and efficiency of our approach. © 2013 IEEE.
Radmanesh, N & Burnett, IS 2013, 'Generation of Isolated Wideband Sound Fields Using a Combined Two-stage Lasso-LS Algorithm', IEEE TRANSACTIONS ON AUDIO SPEECH AND LANGUAGE PROCESSING, vol. 21, no. 2, pp. 378-387.
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Ranga, Y, Matekovits, L, Weily, AR & Esselle, KP 2013, 'A CONSTANT GAIN ULTRA-WIDEBAND ANTENNA WITH A MULTI-LAYER FREQUENCY SELECTIVE SURFACE', Progress In Electromagnetics Research Letters, vol. 38, pp. 119-125.
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An ultra-wideband (UWB) antenna with a novel multi-layer frequency selective surface (FSS) reflector is presented. A significant enhancement in the gain has been achieved in a low profile design while maintaining the excellent impedance bandwidth of the UWB antenna. The average peak gain of the antenna has been increased from 4dBi to 9.3 dBi as a consequence of the use of the FSS reflector. More importantly the gain variation within the frequency range from 3 GHz to 15 GHz is only ±0.5 dB. This is a significant improvement from ±2dB gain variation of the UWB slot antenna without the reflector. This optimized FSS reflector provides the flexibility of mounting a planar antenna close to conducting bodies, including screens and cases.
Ranga, Y, Matekovits, L, Weily, AR & Esselle, KP 2013, 'A low‐profile dual‐layer ultra‐wideband frequency selective surface reflector', Microwave and Optical Technology Letters, vol. 55, no. 6, pp. 1223-1227.
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AbstractAn ultra‐wideband (UWB), dual‐layer frequency selective surface (FSS) is presented.This compact low‐profile FSS has been designed as a reflector for UWB antennas. It can be inserted between a planar UWB antenna and a nearby parallel conducting surface such as a circuit board, screen, or a metal case, to isolate them and to prevent antenna impedance mismatch otherwise caused by the conductor. The measured transmission coefficient magnitude of the FSS is less than −10 dB over a 133% bandwidth and its reflection phase is appropriate for this and other similar reflector applications, over an UWB. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1223–1227, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27583
Rashid, U, Tuan, HD & Nguyen, HH 2013, 'Relay Beamforming Designs in Multi-User Wireless Relay Networks Based on Throughput Maximin Optimization', IEEE Transactions on Communications, vol. 61, no. 5, pp. 1739-1749.
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Beamforming design for multi-user wireless relay networks under the criterion of maximin information throughput is an important but also very hard optimization problem due to its nonconvex nature. The existing approach to reformulate the design as a matrix rank-one constrained optimization problem is highly inefficient. This paper exploits the d.c. (difference of two convex functions) structure of the objective function and the convex structure of the constraints in such a global optimization problem to develop efficient iterative algorithms of very low complexity to find the solutions. Both cases of concurrent and orthogonal transmissions from sources to relays are considered. Numerical results indicate that the proposed algorithms provide solutions that are very close to the upper bound on the solution of the non-orthogonal source transmissions case and are almost equal to the optimal solution of the orthogonal source transmissions case. This demonstrates the ability of the developed algorithms to locate approximations close to the global optimal solutions in a few iterations. Moreover, the proposed methods are superior to other methods in both performance and computation complexity.
Roy, NK, Pota, HR & Hossain, MJ 2013, 'Reactive power management of distribution networks with wind generation for improving voltage stability', Renewable Energy, vol. 58, pp. 85-94.
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Roy, NK, Pota, HR, Mahmud, MA & Hossain, MJ 2013, 'Key factors affecting voltage oscillations of distribution networks with distributed generation and induction motor loads', International Journal of Electrical Power & Energy Systems, vol. 53, pp. 515-528.
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Samal, PB, Soh, PJ & Vandenbosch, GAE 2013, 'A SYSTEMATIC DESIGN PROCEDURE FOR MICROSTRIP-BASED UNIDIRECTIONAL UWB ANTENNAS', Progress In Electromagnetics Research, vol. 143, pp. 105-130.
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San, PP, Ling, SH & Nguyen, HT 2013, 'Industrial Application of Evolvable Block-Based Neural Network to Hypoglycemia Monitoring System', IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, vol. 60, no. 12, pp. 5892-5901.
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Insulin-dependent diabetes mellitus is classified as type 1 diabetes mellitus (T1DM), and it can be further classified as immune-mediated or idiopathic. It is dangerous and can result in unconsciousness, seizures, and even sudden death. The most common physiological parameters to be effected from a hypoglycemic reaction are heart rate and corrected QT interval of the electrocardiogram (ECG) signal. Considering the correlation between physiological parameters of an ECG signal and the status of hypoglycemia, a noninvasive hypoglycemia monitoring system is tested and introduced by proposing a hybrid particle-swarm-optimization-based block-based neural network (BBNN) algorithm. The proposed BBNN model offers advantages over conventional neural networks by performing the simultaneous optimization of both structure and weights. The hybrid particle swarm optimization with wavelet mutation searches for optimized structure and network parameters through particle information over a search space. All the actual data sets of 15 T1DM children were collected at the Department of Health, Government of Western Australia. Several experiments showed that the proposed BBNN performed well in terms of better sensitivity and specificity.
SHIMAZAKI, K, YOSHIZAWA, S, HATAKAWA, Y, MATSUMOTO, T, KONISHI, S & MIYANAGA, Y 2013, 'A VLSI Design of a Tomlinson-Harashima Precoder for MU-MIMO Systems Using Arrayed Pipelined Processing', IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E96.A, no. 11, pp. 2114-2119.
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Soh, PJ, Van den Bergh, B, Xu, H, Aliakbarian, H, Farsi, S, Samal, P, Vandenbosch, GAE, Schreurs, DMM-P & Nauwelaers, BKJC 2013, 'A smart wearable textile array system for biomedical telemetry applications', IEEE Transactions on Microwave Theory and Techniques, vol. 61, no. 5, pp. 2253-2261.
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Stauss, S, Mori, S, Muneoka, H, Terashima, K & Iacopi, F 2013, 'Ashing of photoresists using dielectric barrier discharge cryoplasmas', Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena, vol. 31, no. 6, pp. 061202-061202.
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Stolar, MN, Lech, M, Sheeber, LB, Burnett, IS & Allen, NB 2013, 'Introducing Emotions to the Modeling of Intra- and Inter-Personal Influences in Parent-Adolescent Conversations', IEEE TRANSACTIONS ON AFFECTIVE COMPUTING, vol. 4, no. 4, pp. 372-385.
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An understanding of the dynamics underlying emotional interactions between speakers is essential to the design of effective conversational strategies for interviews, mental health therapies, teaching and counseling, as well as the design of naturalistic human-machine communication systems. The present study introduces a new approach to the modeling of emotional influences during parent-adolescent conversations. The proposed dynamic influence model (DIM) estimates the joint conditional probabilities of speaker's states as a linear combination of simpler inter-and intra-speaker conditional probabilities. Contrary to the previously existing influence models (IMs), the DIM's coefficients are given not as static, constant values but as dynamically changing functions of the time delay between the current and the previous state. The speaker's states were annotated using four labels (speech with positive emotion, speech with negative emotion, emotionally neutral speech and silence with undefined emotion). Experimental results based on the audio recordings of 63 different naturalistic (not acted) parent-adolescent conversations showed that the proposed method leads to psychologically plausible observations. It was also demonstrated that the proposed DIM can achieve up to 20 percent higher accuracy of discriminating between emotional influence patterns of parents and adolescents when compared to the previously used static IM. © 2010-2012 IEEE.
Sun, D, Deng, L, Sun, S & Zhu, J 2013, 'XModified predictive direct power control of doubly fed induction generators', Diangong Jishu Xuebao/Transactions of China Electrotechnical Society, vol. 28, no. 11.
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In this paper, a modified predictive direct power control(P-DPC) strategy is presented for doubly fed induction generators(DFIGs). The basic principles of the conventional P-DPC are expounded for DFIGs. A serious drawback of the conventional P-DPC is that the predicted time duration for the active voltage vectors may be less than zero, resulting in significant low order current harmonics. Based on a deep study on the causes to this phenomenon, a modified time duration predicting strategy is proposed. A comparative study by numerical simulation and experimental testing of the modified P-DPC, conventional P-DPC, vector control and look-up table direct power control (LUT-DPC) shows that the modified P-DPC strategy presents much better steady-state and transient performance in comparison with the conventional P-DPC with reduced low-order harmonic currents while it can still maintain the inherent merits of excellent dynamic performance of the conventional LUT-DPC.
Sun, D, Fang, Y, Sun, S & Zhu, J 2013, 'XDead-beat direct power control of doubly fed induction generators with delay compensation', Diangong Jishu Xuebao/Transactions of China Electrotechnical Society, vol. 28, no. 11.
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This paper presents a dead-beat direct power control(DB-DPC) strategy for doubly fed induction generators(DFIGs) in order to overcome the power ripples, current harmonics and inconstant switching frequency of the conventional look-up table direct power control(LUT-DPC). The proposed DPC strategy employs a simple dead-beat control scheme so as to eliminate the instantaneous errors of active and reactive powers without involving any rotating coordinate transformations. A fixed switching frequency can be achieved by using the space vector modulation(SVM) technique. Furthermore, in order to alleviate the power oscillation, improve the dynamic performance and reduce the steady state errors of active and reactive powers, a two-step prediction compensation method is proposed in practical systems for both power errors and angular shifts caused by sampling delays. The effectiveness and fesibility of the proposed DB-DPC and the delay compensation strategy in the DFIG system are verified by both the simulation and experimental results.
Sutton, GJ, Liu, RP & Collings, IB 2013, 'Modelling IEEE 802.11 DCF Heterogeneous Networks with Rayleigh Fading and Capture', IEEE Transactions on Communications, vol. 61, no. 8, pp. 3336-3348.
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In practical radio transmissions, bit error and channel capture are two dominating factors that affect wireless network performance. Previous models have omitted the interaction between bit error and channel capture. We present a homogeneous-network performance-prediction model for a Rayleigh fading channel that incorporates both the capture effect and transmission error into a 3-D Markov Chain. We accurately characterise the interaction between packet error and capture by incorporating them both into the model of the receiver operations. We show how the model can be solved efficiently. The model provides quality of service measures, including packet delay and loss, which are difficult to achieve with other models. Simulation results confirm that our 3-D model accurately predicts the performance for practical SNRs and receiver sensitivities. We demonstrate that our model can be directly applied to call admission control of Voice over IP service with a QoS guarantee in a WiFi network. The model is then extended to heterogeneous networks, where different stations have different packet arrival rates and packet sizes. © 1972-2012 IEEE.
Tao, X-F, Hou, Y-Z, Wang, K-D, He, H-Y & Guo, YJ 2013, 'GPP-Based Soft Base Station Designing and Optimization', Journal of Computer Science and Technology, vol. 28, no. 3, pp. 420-428.
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It is generally acknowledged that mobile communication base stations are composed of hardware components such as Field Programming Gate Array (FPGA), Digital Signal Processor (DSP), which promise reliable and fluent services for the mobile users. However, with the increasing demand for energy-efficiency, approaches of low power-consumption and high-flexibility are needed urgently. In this circumstance, General Purpose Processor (GPP) attracts people’s attention for its low-cost and flexibility. Benefited from the development of modern GPP in multi-core, Single Instruction Multiple Data (SIMD) instructions, larger cache, etc., GPPs are capable of performing high-density digital processing. In this paper, we compare several software-defined radio (SDR) prototypes and propose the general architecture of GPP-based soft base stations. Then, the schematic design of resource allocation and algorithm optimization in soft base station implementation are studied. As an application example, a prototype of GPP-based soft base station referring to the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is realized and evaluated. To the best of our knowledge, it is the first Soft-LTE prototype ever reported. In the end, we evaluate the timing performance of the LTE soft base station and a packet loss ratio of less than 0.003 is obtained. © 2013 Springer Science+Business Media New York & Science Press, China.
Tapson, J, Cohen, G, Afshar, S, Stiefel, K, Buskila, Y, Wang, R, Hamilton, TJ & Schaik, AV 2013, 'Synthesis of neural networks for spatio-temporal spike pattern recognition and processing', Frontiers in Neuroscience, no. 7 AUG.
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The advent of large scale neural computational platforms has highlighted thelack of algorithms for synthesis of neural structures to perform predefinedcognitive tasks. The Neural Engineering Framework offers one such synthesis,but it is most effective for a spike rate representation of neural information,and it requires a large number of neurons to implement simple functions. Wedescribe a neural network synthesis method that generates synaptic connectivityfor neurons which process time-encoded neural signals, and which makes verysparse use of neurons. The method allows the user to specify, arbitrarily,neuronal characteristics such as axonal and dendritic delays, and synaptictransfer functions, and then solves for the optimal input-output relationshipusing computed dendritic weights. The method may be used for batch or onlinelearning and has an extremely fast optimization process. We demonstrate its usein generating a network to recognize speech which is sparsely encoded as spiketimes.
Tasouji, N, Nourinia, J, Ghobadi, C & Tofigh, F 2013, 'A Novel Printed UWB Slot Antenna With Reconfigurable Band-Notch Characteristics', IEEE Antennas and Wireless Propagation Letters, vol. 12, pp. 922-925.
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Teng, Q, Bai, J, Zhu, J & Sun, Y 2013, 'Fault tolerant model predictive control of three-phase permanent magnet synchronous motors', WSEAS Transactions on Systems, vol. 12, no. 8, pp. 385-397.
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A new fault tolerant model predictive control (FTMPC) strategy is proposed for three-phase magnetically isotropic permanent magnet synchronous motor (PMSM) with complete loss of one phase (LOP) or loss of one leg (LOL) of the inverter. The dynamic model of PMSM with LOP or LOL is derived in abc- System. The principle of FTMPC is investigated, its predictive model for remaining two stator phase currents is established after LOP or LOL occurs, and the flux estimator based on current model is employed in order to calculate the stator flux & its corresponding torque. Extra-leg extra-switch inverter is used as power unit. The PI controller is put to use for regulating rotor speed and generating reference torque. Dynamic responses of healthy MPC and unhealthy FTMPC for PMSM systems are given to compare their performance via simulation and some analysis is presented. The simulation results show that the proposed FTMPC strategy not only allows for continuous and disturbance-free operation of the unhealthy PMSM with LOP or LOL but also preserves satisfactory torque and speed control. And then the effectiveness of the proposed schemes in this paper is demonstrated.
Thalakotuna, DNP, Esselle, KP, Matekovits, L, Heimlich, M & Hay, SG 2013, 'Changing the Electromagnetic Bandgap and Stopbands in a Multistate Periodic Circuit', Microwave and Optical Technology Letters, vol. 55, no. 8, pp. 1871-1874.
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ABSTRACTChanging the electromagnetic bandgaps (EBGs) and hence the stopbands in a multistate periodic microwave circuit is investigated experimentally. The state of the prototype circuit, consisting of 24 unit cells, is changed by closing or opening gaps in selected unit cells. This varies the periodic loading along the circuit and hence the EBG. In most states, the circuit behaves as a bandstop filter, and its stopband width and location are determined by the circuit state. Experimental results confirm that the first stopband width can be as large as 63% (at 4.92 GHz) or can be absent. The EBG leads to excellent isolation around 40 dB in the stopbands. Sharp roll‐off between passbands and stopbands (upto 120 dB/octave) and small length compared to microstrip filters with similar cut‐off and roll‐off characteristics are other advantages of the proposed platform. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1871–1874, 2013
That, ND, Nam, PT & Ha, QP 2013, 'Reachable Set Bounding for Linear Discrete-Time Systems with Delays and Bounded Disturbances', JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS, vol. 157, no. 1, pp. 96-107.
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This paper addresses the problem of reachable set bounding for linear discrete-time systems that are subject to state delay and bounded disturbances. Based on the Lyapunov method, a sufficient condition for the existence of ellipsoid-based bounds of reachable sets of a linear uncertain discrete system is derived in terms of matrix inequalities. Here, a new idea is to minimize the projection distances of the ellipsoids on each axis with different exponential convergence rates, instead of minimization of their radius with a single exponential rate. A smaller bound can thus be obtained from the intersection of these ellipsoids. A numerical example is given to illustrate the effectiveness of the proposed approach. © 2012 Springer Science+Business Media New York.
Truong, BCQ, Hoang Duong Tuan, Ha Hoang Kha & Nguyen, HT 2013, 'Debye Parameter Extraction for Characterizing Interaction of Terahertz Radiation With Human Skin Tissue', IEEE Transactions on Biomedical Engineering, vol. 60, no. 6, pp. 1528-1537.
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This paper is concerned with parameter extraction for the double Debye model, which is used for analytically determining human skin permittivity. These parameters are thought to be the origin of contrast in terahertz (THz) images of skin cancer. The existing extraction methods could generate Debye models, which track their measurements accurately at frequencies higher than 1 THz but poorly at lower frequencies, where the majority of permittivity contrast between healthy and diseased skin tissues is actually observed.We propose a global optimization-based parameter extraction,which results in globally accurate tracking and thus supports the full validity of the Debye model for simulating human skin permittivity in the whole usable THz frequencies. Numerical results confirm viability of our novel methodology.
Tuan, HD, Son, TT, Tuy, H & Khoa, PT 2013, 'Monotonic optimization based decoding for linear codes', Journal of Global Optimization, vol. 55, no. 2, pp. 301-312.
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New efficient methods are developed for the optimal maximum-likelihood (ML) decoding of an arbitrary binary linear code based on data received from any discrete Gaussian channel. The decoding algorithm is based on monotonic optimization that is minimizing a difference of monotonic (d.m.) objective functions subject to the 01 constraints of bit variables. The iterative process converges to the global optimal ML solution after finitely many steps. The proposed algorithms computational complexity depends on input sequence length k which is much less than the codeword length n, especially for a codes with small code rate. The viability of the developed is verified through simulations on different coding schemes.
Tuy, H & Tuan, HD 2013, 'Generalized S-Lemma and strong duality in nonconvex quadratic programming', Journal of Global Optimization, vol. 56, no. 3, pp. 1045-1072.
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On the basis of a new topological minimax theorem, a simple and unified approach is developed to Lagrange duality in nonconvex quadratic programming. Diverse generalizations as well as equivalent forms of the S-Lemma, providing a thorough study of dualit
Vakiloroaya, V, Ha, QP & Samali, B 2013, 'Energy-efficient HVAC systems: Simulation-empirical modelling and gradient optimization', AUTOMATION IN CONSTRUCTION, vol. 31, no. 1, pp. 176-185.
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This paper addresses the energy saving problem of air-cooled central cooling plant systems using the model-based gradient projection optimization method. Theoretical-empirical system models including mechanistic relations between components are developed for operating variables of the system. Experimental data are collected to model an actual air-cooled mini chiller equipped with a ducted fan-coil unit of an office building located in hot and dry climate conditions. Both inputs and outputs are known and measured from field monitoring in one summer month. The development and algorithm resulting from the gradient projection, implemented on a transient simulation software package, are incorporated to solve the minimization problem of energy consumption and predict the system's optimal set-points under transient conditions. The chilled water temperature, supply air temperature and refrigerant mass flow rate are calculated based on the cooling load and ambient dry-bulb temperature profiles by using the proposed approach. The integrated simulation tool is validated by using a wide range of experimentally collected data from the chiller in operation. Simulation results are provided to show possibility of significant energy savings and comfort enhancement using the proposed strategy. © 2012 Elsevier B.V.
Vakiloroaya, V, Ha, QP & Skibniewski, M 2013, 'Modeling and experimental validation of a solar-assisted direct expansion air conditioning system', ENERGY AND BUILDINGS, vol. 66, no. 1, pp. 524-536.
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Continuous increase in global electricity consumption, environmental hazards of pollution and deple-tion of fossil fuel resources have brought about a paradigm shift in the development of eco-friendly andenergy-efficient technologies. This paper reports on an experimental study to investigate the inherentoperational characteristics of a new direct-expansion air conditioning system combined with a vacuumsolar collector. Mathematical models of the system components are firstly derived and then validatedagainst experimental results. To investigate the potential of energy savings, the hybrid solar-assistedair-conditioner is installed and extensively equipped with a number of sensors and instrumentationdevices, for experimentation and data collection. The influence on the system energy usage of the aver-age water temperature, storage tank size and room set-point temperature are then analyzed. Once theair-conditioned room has achieved its desired temperature, the compressor turns off while the cool-ing process still continues until the refrigerant pressure no longer maintains the desired temperature.The advantages of the proposed hybrid system rest with the fact that the compressor can remain off in alonger period by heat impartation into the refrigerant via the water storage tank. Results show an averagemonthly energy saving of about between 25% and 42%.
VEITCH, D, GORST-RASMUSSEN, A & GEFFERTH, A 2013, 'WHY FARIMA MODELS ARE BRITTLE', Fractals, vol. 21, no. 02, pp. 1350012-1350012.
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The FARIMA models, which have long-range-dependence (LRD), are widely used in many areas. Through the derivation of a precise characterization of the spectrum and variance time function, we show that this family is very atypical among LRD processes, being extremely close to the fractional Gaussian noise in a precise sense which results in ultra-fast convergence to fGn under rescaling. Furthermore, we show that this closeness property is not robust to additive noise. We argue that the use of FARIMA, and more generally fractionally differenced time series, should be reassessed in some contexts, in particular when convergence rate under rescaling is important and noise is expected.
Wahid, H, Ha, QP, Duc, H & Azzi, M 2013, 'Neural network-based meta-modelling approach for estimating spatial distribution of air pollutant levels', APPLIED SOFT COMPUTING, vol. 13, no. 10, pp. 4087-4096.
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Continuous measurements of the air pollutant concentrations at monitoring stations serve as a reliable basis for air quality regulations. Their availability is however limited only at locations of interest. In most situations, the spatial distribution beyond these locations still remains uncertain as it is highly influenced by other factors such as emission sources, meteorological effects, dispersion and topographical conditions. To overcome this issue, a larger number of monitoring stations could be installed, but it would involve a high investment cost. An alternative solution is via the use of a deterministic air quality model (DAQM), which is mostly adopted by regulatory authorities for prediction in the temporal and spatial domain as well as for policy scenario development. Nevertheless, the results obtained from a model are subject to some uncertainties and it requires, in general, a significant computation time. In this work, a meta-modelling approach based on neural network evaluation is proposed to improve the estimated spatial distribution of the pollutant concentrations. From a dispersion model, it is suggested that the spatially-distributed pollutant levels (i.e. ozone, in this study) across a region under consideration is a function of the grid coordinates, topographical information, solar radiation and the pollutant's precursor emission. Initially, for training the model, the input-output relationship is extracted from a photochemical dispersion model called The Air Pollution Model and Chemical Transport Model (TAPM-CTM), and some of those input-output data are correlated with the ambient measurements collected at monitoring stations. Here, improved radial basis function networks, incorporating a proposed technique for selection of the network centres, will be developed and trained by using the data obtained and the forward selection approach. The methodology is then applied to estimate the ozone concentrations in the Sydney basin, Austral...
Wang, F, Toe, WJ, Lee, WM, McGloin, D, Gao, Q, Tan, HH, Jagadish, C & Reece, PJ 2013, 'Resolving Stable Axial Trapping Points of Nanowires in an Optical Tweezers Using Photoluminescence Mapping', Nano Letters, vol. 13, no. 3, pp. 1185-1191.
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Axially resolved microphotoluminescence mapping of semiconductor nanowires held in an optical tweezers reveals important new experimental information regarding equilibrium trapping points and trapping stability of high aspect ratio nanostructures. In this study, holographic optical tweezers are used to scan trapped InP nanowires along the beam direction with respect to a fixed excitation source and the luminescent properties are recorded. It is observed that nanowires with lengths on the range of 3-15 μm are stably trapped near the tip of the wire with the long segment positioned below the focus in an inverted trapping configuration. Through the use of trap multiplexing we investigate the possibility of improving the axial stability of the trapped nanowires. Our results have important implication for applications of optically assisted nanowire assembly and optical tweezers based scanning probes microscopy. © 2013 American Chemical Society.
Wang, L, Dimitrijev, S, Walker, G, Han, JS, Iacopi, A, Tanner, P, Hold, L, Zhao, Y & Iacopi, F 2013, 'Color Chart for Thin SiC Films Grown on Si Substrates', Materials Science Forum, vol. 740-742, pp. 279-282.
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In this paper, a color chart was defined for thin SiC films grown on Si substrates. For SiC films thinner than 500 nm, the surface color was observed using an optical microscope with the incident light normally illuminated on the SiC surface. An image of the surface was then taken by a camera attached to the optical microscope and the surface color was defined using RGB code. For SiC films thicker than 500 nm, the image taken by the camera did not represent the real color of the SiC film. Therefore, for these thicker SiC films, the colors were defined by observing the films under daylight fluorescent lighting by naked eyes. It was found that the colors of the SiC films vary periodically as the thickness increased. No color saturation was found for SiC films up to 1185 nm thick.
Wang, R, Cohen, G, Stiefel, KM, Hamilton, TJ, Tapson, J & van Schaik, A 2013, 'An FPGA Implementation of a Polychronous Spiking Neural Network with Delay Adaptation', Frontiers in Neuroscience, vol. 7.
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Wang, W & Lu, DDC 2013, 'A bridgeless DIVM buck PFC rectifier with digital control and voltage doubler configuration', International Journal of Power Electronics, vol. 5, no. 2, pp. 125-125.
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A new digitally controlled, bridgeless AC/DC buck converter that operates in discontinuous-input-voltage mode (DIVM) is presented. It inherits power factor correction property and draws continuous input current during conduction period. In addition, the efficiency of the proposed buck PFC rectifier is improved by adopting a bridgeless configuration. The converter also works as a voltage-doubler which reduces the size of the output capacitors. Detailed operating analysis, design criteria, and modelling of the buck converter are reported. Experimental results for verifying the theoretical analysis are also presented. © 2013 Inderscience Enterprises Ltd.
Wei Ni, Ren Ping Liu, Collings, IB & Xin Wang 2013, 'Indoor cooperative small cells over ethernet', IEEE Communications Magazine, vol. 51, no. 9, pp. 100-107.
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The ubiquitous Ethernet has great potential to become an easy-to-install cost-effective backhaul solution for mobile small cells. However, limited Ethernet bandwidth is a practical constraint. Not only is small cell capacity limited by Ethernet bandwidth, but also the synchronization between cells can be substantially compromised. In this article we discuss small cells with Ethernet backhaul, focusing on two practical and important aspects: backhaul bandwidth requirements and tolerance to synchronization errors. The aspects become challenging in indoor small cell applications where the cells need to cooperatively suppress strong interference, producing a large amount of backhaul traffic. To address the challenges, we introduce a new distributed scheme of cooperative small cells over Ethernet. Exploiting a soft information combining technique, the scheme allows the signals of cooperative cells to be combined at aggregate switches along their backhaul paths, reducing backhaul traffic in Ethernet and distributing computational complexity. Our case study shows that the distributed scheme can reduce small cell backhaul traffic by 64 percent, compared to a conventional centralized approach. It is also tolerant to a large frequency error of ±4.6 ppm in a ¿freerun¿ state where synchronization is lost. Given the substantially reduced backhaul traffic, the new distributed scheme is able to support three times the cooperative small cells of the conventional centralized approach. © 1979-2012 IEEE. © 2013 IEEE.
Xin, J, Chen, K, Bai, L, Liu, D & Zhang, J 2013, 'Depth Adaptive Zooming Visual Servoing for a Robot with a Zooming Camera', International Journal of Advanced Robotic Systems, vol. 10, no. 2, pp. 120-120.
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To solve the view visibility problem and keep the observed object in the field of view (FOV) during the visual servoing, a depth adaptive zooming visual servoing strategy for a manipulator robot with a zooming camera is proposed. Firstly, a zoom control mechanism is introduced into the robot visual servoing system. It can dynamically adjust the camera's field of view to keep all the feature points on the object in the field of view of the camera and get high object local resolution at the end of visual servoing. Secondly, an invariant visual servoing method is employed to control the robot to the desired position under the changing intrinsic parameters of the camera. Finally, a nonlinear depth adaptive estimation scheme in the invariant space using Lyapunov stability theory is proposed to estimate adaptively the depth of the image features on the object. Three kinds of robot 4DOF visual positioning simulation experiments are conducted. The simulation experiment results show that the proposed approach has higher positioning precision. © 2013 Xin et al.
Xinwang Liu, Jianping Yin, Lei Wang, Lingqiao Liu, Jun Liu, Chenping Hou & Jian Zhang 2013, 'An Adaptive Approach to Learning Optimal Neighborhood Kernels', IEEE Transactions on Cybernetics, vol. 43, no. 1, pp. 371-384.
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Learning an optimal kernel plays a pivotal role in kernel-based methods. Recently, an approach called optimal neighborhood kernel learning (ONKL) has been proposed, showing promising classification performance. It assumes that the optimal kernel will reside in the neighborhood of a 'pre-specified' kernel. Nevertheless, how to specify such a kernel in a principled way remains unclear. To solve this issue, this paper treats the pre-specified kernel as an extra variable and jointly learns it with the optimal neighborhood kernel and the structure parameters of support vector machines. To avoid trivial solutions, we constrain the pre-specified kernel with a parameterized model. We first discuss the characteristics of our approach and in particular highlight its adaptivity. After that, two instantiations are demonstrated by modeling the pre-specified kernel as a common Gaussian radial basis function kernel and a linear combination of a set of base kernels in the way of multiple kernel learning (MKL), respectively. We show that the optimization in our approach is a min-max problem and can be efficiently solved by employing the extended level method and Nesterov's method. Also, we give the probabilistic interpretation for our approach and apply it to explain the existing kernel learning methods, providing another perspective for their commonness and differences. Comprehensive experimental results on 13 UCI data sets and another two real-world data sets show that via the joint learning process, our approach not only adaptively identifies the pre-specified kernel, but also achieves superior classification performance to the original ONKL and the related MKL algorithms. © 2012 IEEE.
Xinwang Liu, Lei Wang, Jianping Yin, En Zhu & Jian Zhang 2013, 'An Efficient Approach to Integrating Radius Information into Multiple Kernel Learning', IEEE Transactions on Cybernetics, vol. 43, no. 2, pp. 557-569.
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Integrating radius information has been demonstrated by recent work on multiple kernel learning (MKL) as a promising way to improve kernel learning performance. Directly integrating the radius of the minimum enclosing ball (MEB) into MKL as it is, however, not only incurs significant computational overhead but also possibly adversely affects the kernel learning performance due to the notorious sensitivity of this radius to outliers. Inspired by the relationship between the radius of the MEB and the trace of total data scattering matrix, this paper proposes to incorporate the latter into MKL to improve the situation. In particular, in order to well justify the incorporation of radius information, we strictly comply with the radius-margin bound of support vector machines (SVMs) and thus focus on the ℓ2-norm soft-margin SVM classifier. Detailed theoretical analysis is conducted to show how the proposed approach effectively preserves the merits of incorporating the radius of the MEB and how the resulting optimization is efficiently solved. Moreover, the proposed approach achieves the following advantages over its counterparts: 1) more robust in the presence of outliers or noisy training samples; 2) more computationally efficient by avoiding the quadratic optimization for computing the radius at each iteration; and 3) readily solvable by the existing off-the-shelf MKL packages. Comprehensive experiments are conducted on University of California, Irvine, protein subcellular localization, and Caltech-101 data sets, and the results well demonstrate the effectiveness and efficiency of our approach. © 2012 IEEE.
Xu, D-Y, Yang, S-L & Liu, R-P 2013, 'A mixture of HMM, GA, and Elman network for load prediction in cloud-oriented data centers', Journal of Zhejiang University SCIENCE C, vol. 14, no. 11, pp. 845-858.
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The rapid growth of computational power demand from scientific, business, and Web applications has led to the emergence of cloud-oriented data centers. These centers use pay-as-you-go execution environments that scale transparently to the user. Load prediction is a significant cost-optimal resource allocation and energy saving approach for a cloud computing environment. Traditional linear or nonlinear prediction models that forecast future load directly from historical information appear less effective. Load classification before prediction is necessary to improve prediction accuracy. In this paper, a novel approach is proposed to forecast the future load for cloud-oriented data centers. First, a hidden Markov model (HMM) based data clustering method is adopted to classify the cloud load. The Bayesian information criterion and Akaike information criterion are employed to automatically determine the optimal HMM model size and cluster numbers. Trained HMMs are then used to identify the most appropriate cluster that possesses the maximum likelihood for current load. With the data from this cluster, a genetic algorithm optimized Elman network is used to forecast future load. Experimental results show that our algorithm outperforms other approaches reported in previous works. © 2013 Journal of Zhejiang University Science Editorial Office and Springer-Verlag Berlin Heidelberg.
Xu, M, Xu, C, He, X, Jin, JS, Luo, S & Rui, Y 2013, 'Hierarchical affective content analysis in arousal and valence dimensions', Signal Processing, vol. 93, no. 8, pp. 2140-2150.
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Different from the existing work focusing on emotion type detection, the proposed approach in this paper provides flexibility for users to pick up their favorite affective content by choosing either emotion intensity levels or emotion types. Specifically, we propose a hierarchical structure for movie emotions and analyze emotion intensity and emotion type by using arousal and valence related features hierarchically. Firstly, three emotion intensity levels are detected by using fuzzy c-mean clustering on arousal features. Fuzzy clustering provides a mathematical model to represent vagueness, which is close to human perception. Then, valence related features are used to detect five emotion types. Considering video is continuous time series data and the occurrence of a certain emotion is affected by recent emotional history, conditional random fields (CRFs) are used to capture the context information. Outperforming Hidden Markov Model, CRF relaxes the independence assumption for states required by HMM and avoids bias problem. Experimental results show that CRF-based hierarchical method outperforms the one-step method on emotion type detection. User study shows that majority of the viewers prefer to have option of accessing movie content by emotion intensity levels. Majority of the users are satisfied with the proposed emotion detection. © 2012 Elsevier B.V.
Xu, Z, Sandrasegaran, K, Kong, X, Zhu, X, Zhao, J, Hu, B & Chung Lin, C 2013, 'Pedestrain Monitoring System using Wi-Fi Technology And RSSI Based Localization', International Journal of Wireless & Mobile Networks, vol. 5, no. 4, pp. 17-34.
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This paper presentsa new simple mobile tracking system based on IEEE802.11 wireless signal detection, which can be used for analyzingthe movement of pedestrian traffic. Wi-Fi packets emitted by Wi-Fi enabled smartphones are received at a monitoring station and these packets contain date, time, MAC address, and other information. The packets are received at a number of stations, distributed throughout the monitoring zone, which can measure the received signal strength. Based on the location of stations and data collected at the stations, the movement of pedestrian traffic can be analyzed. This information can be used to improve the services, such as better bus schedule time and better pavement design. In addition, this paper presents a signal strength based localization method.
Yang, X, Tao, X, Dutkiewicz, E, Huang, X, Guo, YJ & Cui, Q 2013, 'Energy-Efficient Distributed Data Storage for Wireless Sensor Networks Based on Compressed Sensing and Network Coding', IEEE Transactions on Wireless Communications, vol. 12, no. 10, pp. 5087-5099.
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Recently, distributed data storage (DDS) for Wireless Sensor Networks (WSNs) has attracted great attention, especially in catastrophic scenarios. Since power consumption is one of the most critical factors that affect the lifetime of WSNs, the energy efficiency of DDS in WSNs is investigated in this paper. Based on Compressed Sensing (CS) and network coding theories, we propose a Compressed Network Coding based Distributed data Storage (CNCDS) scheme by exploiting the correlation of sensor readings. The CNCDS scheme achieves high energy efficiency by reducing the total number of transmissions Nttot and receptions Nrtot during the data dissemination process. Theoretical analysis proves that the CNCDS scheme guarantees good CS recovery performance. In order to theoretically verify the efficiency of the CNCDS scheme, the expressions for Nttot and Nrtot are derived based on random geometric graphs (RGG) theory. Furthermore, based on the derived expressions, an adaptive CNCDS scheme is proposed to further reduce N ttot and Nrtot. Simulation results validate that, compared with the conventional ICStorage scheme, the proposed CNCDS scheme reduces Nttot, Nrtot, and the CS recovery mean squared error (MSE) by up to 55%, 74%, and 76% respectively. In addition, compared with the CNCDS scheme, the adaptive CNCDS scheme further reduces Nttot and N rtot by up to 63% and 32% respectively. © 2002-2012 IEEE.
Ye, S, Liang, X, Wang, W, Geng, J, Jin, R, Guo, YJ & Bird, TS 2013, 'Design of Arbitrarily Shaped Planar Microstrip Antenna Arrays with Improved Efficiency', International Journal of Antennas and Propagation, vol. 2013, pp. 1-10.
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A design technique is described for an arbitrarily shaped planar microstrip antenna array with improved radiation efficiency. In order to fully utilize the limited antenna aperture, several basic modules are proposed from which we construct the array. A consideration of the aperture shape shows that with several practical examples a proper combination of these basic modules not only allows the convenient design of arbitrarily-shaped microstrip array, but also helps to improve the aperture radiation efficiency. To confirm the feasibility of the approach, a circular array with 256 elements was constructed and fabricated. Both computed and measured aperture radiation results are compared and these demonstrate that the design technique is effective for arbitrarily-shaped planar microstrip arrays.
Yeap, KB, Iacopi, F, Geisler, H, Hangen, U & Zschech, E 2013, 'Nanoindentation for reliability assessment of ULK films and interconnects structures', Microelectronic Engineering, vol. 106, pp. 182-187.
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© 2012 Elsevier B.V. All rights reserved. The structural integrity of interconnect structures containing ultra-low-k (ULK) dielectrics is highly dependent on the mechanical properties of the porous dielectrics, e.g. fracture toughness elastic modulus and adhesion as well. Four-point-bending (FPB) and double-cantilever-beam (DCB) methods for the evaluation of fracture properties require out-of-fab sample preparation and testing. The reliable characterization of interfacial adhesion is important for in-line/at-line process development and control in microelectronics manufacturing. The ability to detect an out-of-spec or defective ULK film at an early process step could potentially save processing and materials cost. Therefore, the development of quick turnaround experimental methodologies for monitoring in-line/at-line mechanical stability of ULK films and ULK-containing interconnects is of great interest for semiconductor industry. This study presents two novel experimental approaches for the evaluation of interface adhesion and mechanical robustness of on-chip interconnects structures based on nanoindentation and nanoscratch, (a) wedge indentation and (b) bump assisted BEOL stability indentation (BABSI) tests, respectively. Wedge indentation tests on ULK films with increasing porosity show a decrease of adhesion values. Correspondingly, BABSI tests show increasing failure rates for Cu/ULK interconnect structures containing mechanically weaker dielectrics.
Yiwei Yu, Dutkiewicz, E, Xiaojing Huang & Mueck, M 2013, 'Downlink Resource Allocation for Next Generation Wireless Networks with Inter-Cell Interference', IEEE Transactions on Wireless Communications, vol. 12, no. 4, pp. 1783-1793.
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This paper presents a novel downlink resource allocation scheme for OFDMA-based next generation wireless networks subject to inter-cell interference (ICI). The scheme consists of radio resource and power allocations, which are implemented separately. Low-complexity heuristic algorithms are first proposed to achieve the radio resource allocation, where graph-based framework and fine physical resource block (PRB) assignment are performed to mitigate major ICI and hence improve the network performance. Given the solution of radio resource allocation, a novel distributed power allocation is then performed to optimize the performance of cell-edge users under the condition that desirable performance for cell-center users must be maintained. The power optimization is formulated as an iterative barrier-constrained water-filling problem and solved by using the Lagrange method. Simulation results indicate that our proposed scheme can achieve significantly balanced performance improvement between cell-edge and cell-center users in multi-cell networks compared with other schemes, and therefore realize the goal of future wireless networks in terms of providing high performance to anyone from anywhere. © 2002-2012 IEEE.
Yoshizawa, S & Miyanaga, Y 2013, 'Evaluation of Cover and Reflector in Receiver Antennas for SM-MIMO Wireless Communications', Journal of Electrical and Computer Engineering, vol. 2013, pp. 1-8.
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YOSHIZAWA, S & MIYANAGA, Y 2013, 'Hardware Implementation of FFT Processors for Wireless Communications', IEICE ESS Fundamentals Review, vol. 7, no. 2, pp. 116-123.
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Yu, D, Nanda, P & He, X 2013, 'Wireless sensor network (WSN) energy efficiency challenge from implementation perspectives', Advanced Science Letters, vol. 19, no. 2, pp. 642-645.
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Through review of current Wireless Sensor Network (WSN) energy preserving techniques used in industry and academic research, we recognize that the integration of various techniques through implementation is a challenging task due to application specific nature of system integration. On one hand, most researches on energy efficiency focus on one single layer with perfect assumptions about other layers and environment parameters. While this methodology will simplify the design process and provide valuable insight into single layer solution, such approach cannot provide information on layer incompatibilities between different sets of protocols, nor will give information on the overall performance of a network based on the protocols under test. Further more, under various non-standard assumptions, the real contribution of these proposed optimization methods are difficult to be achieved if not impossible. Hence industry professionals become very cautious to integrate diverse and advance ad hoc solutions into their products and standards. To show credibility of the ad hoc solutions and their implications on industry applications, researchers have to evaluate their solutions under a generic architecture Which can test different scenarios and evaluate performance based on a wide range of metrics. © 2013 American Scientific Publishers All rights reserved.
Yu, D, Nanda, P, Cao, L & He, X 2013, 'TCTM: an evaluation framework for architecture design on wireless sensor networks', International Journal of Sensor Networks, vol. 14, no. 3, pp. 168-168.
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This paper presents an evaluation framework for architecture designs on wireless sensor networks (WSNs). We introduce a simple evaluation model: triangular constraint tradeoffs model (TCTM) to grasp the essence of the architecture design consideration under transient wireless media characteristic and stringent limitation on energy and computing resource of WSNs. Based on this evaluation framework, we investigate the existing architectures proposed in literature from three main competing constraint aspects, namely generality, cost, and performance. Two important concepts: performance efficiency and deployment efficiency are identified and distinguished in overall architecture efficiency. With this powerful abstract and simple model, we describe the motivations of major body of WSNs architectures proposed in current literature. We also analyse the fundamental advantage and limitations of each class of architectures from TCTM perspective. We foresee the influence of evolving technology to futuristic architecture design. We believe our efforts will serve as a reference to orient researchers and system designers in this area
Zare Borzeshi, E, Piccardi, M, Riesen, K & Bunke, H 2013, 'Discriminative prototype selection methods for graph embedding', Pattern Recognition, vol. 46, no. 6, pp. 1648-1657.
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Graphs possess a strong representational power for many types of patterns. However, a main limitation in their use for pattern analysis derives from their difficult mathematical treatment. One way of circumventing this problem is that of transforming the graphs into a vector space by means of graph embedding. Such an embedding can be conveniently obtained by using a set of prototype graphs and a dissimilarity measure. However, when we apply this approach to a set of class-labelled graphs, it is challenging to select prototypes capturing both the salient structure within each class and inter-class separation. In this paper, we introduce a novel framework for selecting a set of prototypes from a labelled graph set taking their discriminative power into account. Experimental results showed that such a discriminative prototype selection framework can achieve superior results in classification compared to other well-established prototype selection approaches. © 2012 Elsevier Ltd.
Zeng, J, Guo, Y, Li, Y, Zhu, J & Li, J 2013, 'Two-dimensional magnetic property measurement for magneto-rheological elastomer', JOURNAL OF APPLIED PHYSICS, vol. 113, no. 17.
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Zhang, G, Heusdens, R & Kleijn, WB 2013, 'Large Scale LP Decoding with Low Complexity', IEEE Communications Letters, vol. 17, no. 11, pp. 2152-2155.
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Zhang, J, Huang, ML & Hoang, D 2013, 'Visual analytics for intrusion detection in spam emails', International Journal of Grid and Utility Computing, vol. 4, no. 2/3, pp. 178-178.
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Spam email attacks are increasing at an alarming rate and have become more and more cunning in nature. This has necessitated the need for visual spam email analysis within an intrusion detection system to identify these attacks. The challenges are how to increase the accuracy of detection and how to visualise large volumes of spam email to better understand the analysis results and identify email attacks. This paper proposes a Density-Weight model that is to strengthen and extend the system capacity for analysis of network attacks in spam emails, including DDoS attacks. An interactive visual clustering method DA-TU is introduced to classify and display spam emails. The experimental results have shown that the proposed new model has improved the accuracy of intrusion detection and provides a better understanding of the nature of spam email attacks on though the network. Copyright © 2013 Inderscience Enterprises Ltd.
Zhang, J, Xu, W, Gao, C, Wang, S, Qiu, J, Zhu, JG & Guo, Y 2013, 'Analysis of Inter-Turn Insulation of High Voltage Electrical Machine by Using Multi-Conductor Transmission Line Model', IEEE Transactions on Magnetics, vol. 49, no. 5, pp. 1905-1908.
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In this paper, the inter-turn insulation of stator winding is comprehensively discussed. An equivalent circuit model and a multi-conductor transmission line (MTL) theory are established for the inter-turn voltage evaluation under the switching-impulse voltage, respectively. The distributed inductances are calculated by using small-signal analysis in finite element method (FEM) and the ac resistances of coils are analyzed considering the skin effect. The distributed capacitances of the coils are determined by using both electric field FEM and analytic equations. The electric potential distribution of inter-turn is calculated by the above two methods. The incident and reflect voltages are calculated by using the MTL model. The electric field of inter-turn calculated by using the FEM is presented. The FEM is used for the calculation of the inter-turn electric field distribution. The position where the inter-turn insulation may be more prone to breakdown is determined according to the result. Finally, the impact factors of inter-turn insulation including insulation materials and positions of failure in winding are analyzed in detail.
Zhang, JA 2013, 'Response to 'On Mathematical Equivalence Between Vector OFDM and Quadrature OFDMA'', IEEE Transactions on Communications, vol. 61, no. 2, pp. 815-815.
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Zhang, JA, Collings, IB, Chen, CS, Roullet, L, Luo, L, Ho, S-W & Yuan, J 2013, 'Evolving small-cell communications towards mobile-over-FTTx networks', IEEE Communications Magazine, vol. 51, no. 12, pp. 92-101.
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Small cell techniques are recognized as the best way to deliver high capacity for broadband cellular communications. Femtocell and distributed antenna systems (DASs) are important components in the overall small cell story, but are not the complete solution. They have major disadvantages of very limited cooperation capability and expensive deployment cost, respectively. In this article, we propose a novel mobile-over-FTTx (MoF) network architecture, where an FTTx network is enhanced as an integrated rather than a simple backhauling component of a new mobile network delivering low-cost and powerful small cell solutions. In part, the MoF architecture combines the advantages of femtocells and DASs, while overcoming their disadvantages. Implementation challenges and potential solutions are discussed. Simulation results are presented and demonstrate the strong potential of the MoF in boosting the capacity of mobile networks. © 1979-2012 IEEE.
Zhang, JA, Huang, X, Suzuki, H & Chen, Z 2013, 'Gaussian Approximation Based Interpolation for Channel Matrix Inversion in MIMO-OFDM Systems', IEEE Transactions on Wireless Communications, vol. 12, no. 3, pp. 1407-1417.
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Channel matrix inversion, which requires significant hardware resource and computational power, is a very challenging problem in MIMO-OFDM systems. Casting the frequency-domain channel matrix into a polynomial matrix, interpolation-based matrix inversion provides a promising solution to this problem. In this paper, we propose novel algorithms for interpolation based matrix inversion, which require little prior information of the channel matrix and enable the use of simple low-complexity interpolators such as spline and low pass filter interpolators. By invoking the central limit theorem, we show that a Gaussian approximation function well characterizes the power of the polynomial coefficients. Some low-complexity and efficient schemes are then proposed to estimate the parameters of the Gaussian function. With these estimated parameters, we introduce phase shifted interpolation and propose two algorithms which can achieve good interpolation accuracy using general low-complexity interpolators. Simulation results show that up to 85% complexity saving can be achieved with small performance degradation. © 2002-2012 IEEE.
Zhang, JA, Lin Luo & Xiaojing Huang 2013, 'Multicarrier Systems Based on Multistage Layered IFFT Structure', IEEE Signal Processing Letters, vol. 20, no. 7, pp. 665-668.
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This letter extends our previous work on layered inverse Fast Fourier Transform (IFFT) structure to a multistage layered IFFT structure where data symbols can input at different stages of the IFFT. We first show that part of the IFFT in the transmitter of an OFDM system can be shifted to the receiver, while a conventional one-tap frequency-domain equalizer is still applicable. We then propose two IFFT split schemes based on decimation-in-time and decimation-in-frequency IFFT algorithms to enable interference-free symbol recovery with simple linear equalizers. Applications of the proposed schemes in multiple access communications are investigated. Simulation results demonstrate the effectiveness of the proposed schemes in improving bit-error-rate performance. © 1994-2012 IEEE.
Zhang, JA, Yang, TT & Chen, Z 2013, 'Under-determined Training and Estimation for Distributed Transmit Beamforming Systems', IEEE Transactions on Wireless Communications, vol. 12, no. 4, pp. 1936-1946.
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Distributed transmit beamforming (DTB) can significantly boost the signal-to-noise ratio (SNR) of a wireless communication system. To realize the benefits of DTB, generating and feeding back beamforming vector are very challenging tasks. Existing schemes have either enormous overhead or weak robustness in noisy channels. In this paper, we investigate the design of training sequences and beamforming vector estimators in DTB systems. We consider an under-determined case, where the length of training sequence N sent from each node is smaller than the number of source nodes M. We derive the optimal estimation of the beamforming vector that maximizes the beamforming gain and show that it can be well approximated as the linear minimum mean square error (LMMSE) estimator. Based on the LMMSE estimator, we investigate the optimal design of training sequences and propose efficient DTB schemes. We analytically show that these schemes can achieve approximately N times increased SNR in uncorrelated channels, and even higher gain in correlated ones. We also propose a concatenated training scheme which optimally combines the training signals over multiple frames to obtain the beamforming vector. Simulation results demonstrate that the proposed DTB schemes can yield significant gains even at very low SNRs, with total feedback bits much less than those required in the existing schemes. © 2002-2012 IEEE.
Zhang, Q, Wang, S, Qiu, J, Jing, X, Gao, C, Zhu, JG & Guo, Y 2013, 'Application of an Improved Multi-Conductor Transmission Line Model in Power Transformer', IEEE Transactions on Magnetics, vol. 49, no. 5, pp. 2029-2032.
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In this paper, a new multi-conductor transmission line (MTL) method is introduced to analyze the voltage distribution of power transformer windings, including inserted capacitance continuous winding and duplex winding, under lightning overvoltage excitation. This new MTL model may take into account electromagnetic induction between windings. The influences of copper screen tapes on the MTL parameters are discussed. The terminal conditions of single winding including screen tape differ from those of duplex windings, which have to be carefully considered. The results are compared with the traditional equivalent circuit model, revealing that the new model may provide detailed accurate voltage distribution on each turn of the windings.
Zhang, T, Du, J, Guo, YJ & Sun, X 2013, 'A 7–8.5 GHz High Performance MMIC HTS Josephson Mixer', IEEE Microwave and Wireless Components Letters, vol. 23, no. 8, pp. 427-429.
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A low-loss, low power consumption monolithic high-temperature superconducting (HTS) Josephson junction mixer at 7-8.5 GHz is presented. The mixer consists of a HTS YBa 2Cu 3O 7-x (YBCO) bandpass filter for RF input, a lowpass filter for IF output and a LO resonator integrated with a single Josephson junction. All the passive and active devices are fabricated on a 20 mmtimes 10 mm MgO substrate. Measurement result shows a conversion gain of -7 dB at 40 K, and -4.7 dB at 20 K. The IF output versus the RF input exhibits a wide linear range of conversion gains. The mixer has an extremely low LO power requirement at -32 dBm and a 50 nW power consumption. © 2001-2012 IEEE.
Zhang, T, Du, J, Guo, YJ & Sun, X 2013, 'A compact HTS bandpass microstrip filter with novel coupling structure for on-chip integration', Physica C: Superconductivity, vol. 495, pp. 69-73.
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A compact low-complexity high-selectivity high-temperature superconducting (HTS) microstrip bandpass filter is presented in this paper, which consists of only three half-wavelength resonators. A novel coupling scheme is used to provide a pair of transmission zeros outside the passband, so that the selectivity of the filter is improved. The filter is fabricated on an MgO substrate with YBa 2 Cu 3 O 7-x (YBCO) coating. Measurement result shows an in-band insertion loss at 0.5 dB, a sharp slope, and a stopband rejection better than 20 dB. The compactness and high-selectivity features make the filter suitable for on-chip integration of HTS receiver front-ends. © 2013 Published by Elsevier B.V. All rights reserved.
Zhu, H & Chu, Q-X 2013, 'Ultra-Wideband Bandpass Filter With a Notch-Band Using Stub-Loaded Ring Resonator', IEEE Microwave and Wireless Components Letters, vol. 23, no. 7, pp. 341-343.
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Zhu, L, Yang, Q, Yan, R, Li, Y, Zhang, X, Yan, W & Zhu, J 2013, 'Numerical computation for a new way to reduce vibration and noise due to magnetostriction and magnetic forces of transformer cores', Journal of Applied Physics, vol. 113, no. 17, pp. 17A333-17A333.
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Magnetostriction (MS) caused by the global magnetization of limbs and yokes and magnetic forces are the undisputed causes of the vibration and noise in power transformer cores. This paper presents a novel way to reduce the vibration and noise, in which nanocrystalline soft magnetic composite (NSMC) material with high permeability is used to fill the step-lap joint gaps of the power transformer magnetic cores. In order to numerically predict the effectiveness of the proposed method, a 3-D magneto-mechanical strong coupled model including MS and magnetic anisotropy of steel sheet was founded. Then, the numerical model was applied to analyze the step-lap joint region of the corner of magnetic cores. The analysis results illustrated that the deformation and noise of core with NSMC are lower than with the traditional epoxy damping material. Moreover, the validity of the proposed new way was verified by the simplified step-lap joint cores, which were achieved based on Epstein Frames.
Abbas, SM, Esselle, KP & Ranga, Y 1970, 'A printed antenna with a ground plane and electromagnetically coupled feed for 2.45GHz body area networks', 2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, IEEE, Orlando, FL, pp. 2143-+.
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Abbas, SM, Ranga, Y & Esselle, KP 1970, 'Stub-loaded printed antenna with a ground plane and electromagnetically coupled feed for 2.45GHz body area networks', 2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO), 2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO), IEEE.
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This paper presents a stub-loaded printed antenna with a full ground plane and electromagnetically coupled feed for body area network devices operating in industrial, scientific, and medical (ISM) band at 2.45 GHz. Performance and characteristics are presented along with parametric analyses. Antenna performance is investigated under bending to check its suitability for conformal body centric wireless communication devices. The electromagnetically-coupled feed is tuned to fill a null in the radiation pattern and to achieve impedance matching, which is further fine tuned by stub loading. The proposed antenna exhibits a wide radiation pattern along the body surface to provide maximum coverage and its narrow physical width (14mm) makes it suitable for on-body applications. © 2013 IEEE.
Abbas, SM, Ranga, Y & Esselle, KP 1970, 'Stub-Loaded Printed Antenna with a Ground Plane and Electromagnetically Coupled Feed for 2.45GHz Body Area Networks', 2013 IEEE MTT-S INTERNATIONAL MICROWAVE WORKSHOP SERIES ON RF AND WIRELESS TECHNOLOGIES FOR BIOMEDICAL AND HEALTHCARE APPLICATIONS (IMWS-BIO), IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-Bio), IEEE, Singapore, SINGAPORE, pp. 279-281.
Aguilera, RP, Quevedo, DE, Vazquez, S & Franquelo, LG 1970, 'Generalized Predictive Direct Power Control for AC/DC converters', 2013 IEEE ECCE Asia Downunder, 2013 IEEE ECCE Asia Downunder (ECCE Asia 2013), IEEE, Melbourne, VIC, Australia, pp. 1215-1220.
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Predictive-Direct Power Control (P-DPC) is an attractive predictive control technique for AC/DC converters. This control strategy considers a dynamic power model of converter to forecast possible future converter behaviours. Thus, P-DPC provides an optimal switching pattern in order to directly control the active and reactive powers. Nevertheless, as will be shown in this work, this control method limits the converter operation range to a small power angle. In this work, we propose an improved P-DPC strategy, which allows one to extend the power angle operation range of an AC/DC converter while improving its power quality. © 2013 IEEE.
Ahad, MT, Dyson, LE & Gay, V 1970, 'Exploring m-banking for rural SMES from the bank's perspective: A focus group study in Bangladesh', Proceedings - Pacific Asia Conference on Information Systems, PACIS 2013, Pacific Asia Conference on Information Systems, The Association for Information Systems (AIS), Jeju Island, South Korea, pp. 1-14.
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There is relatively little known about the m-banking use by the rural small and medium enterprises (SMEs) in Bangladesh. This research fills the gap by presenting the Key advantages of using m-banking by the rural SMEs that a bank can offer in Bangladesh. The research also reports on the critical country level-factors, organizational success factors and obstacles in m-banking adoption for rural SMEs. A focus group was interviewed and the data were analysed using NVivo9.The findings indicate that improved banking facility, an opportunity to create employment in rural area, easy settlement of trade between SMEs, better cash management are some important advantages of m-banking for the rural SMEs. Technology and human resource capabilities of the banks together with the development of mobile infrastructure are some influential factors in m-banking development in Bangladesh. This paper also identifies engagement with the SMEs as an important organizational factor in m-banking diffusion for rural SME that have been rarely identified in prior literature. However, the major constraints are the operational constraints such as cash management, policy and regulation and administrative obstacles. Recommendation for a business version m-banking, joint advertisement by the banks and mobile telecom organisations and a regional m-banking platform are also new knowledge in m-banking research. This is one of the few papers from the perspective of a bank, since most of the literature approaches the matter from the consumer standpoint. The outcomes and results of this research will be of potential value to the government, banks and mobile telecommunications in accelerating the development of m-banking in Bangladesh and in other developing countries.
Ahmed, F, Li, R & Feng, Y 1970, 'Development of a Compact Planar Multiband MIMO Antenna for 4G/LTE/WLAN Mobile Phone Standards', 2013 PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP), VOLS 1 AND 2, International Symposium on Antennas and Propagation (ISAP), IEEE, Nanjing, PEOPLES R CHINA.
Ahmed, F, Ying Feng & Ronglin Li 1970, 'Dual wide-band four-unit MIMO antenna system for 4G/LTE and WLAN mobile phone applications', 2013 Loughborough Antennas & Propagation Conference (LAPC), 2013 Loughborough Antennas & Propagation Conference (LAPC), IEEE, Loughborough Univ, Loughborough, ENGLAND, pp. 202-207.
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Ali, MS, Pota, HR, Mahmud, MA & Hossain, MJ 1970, 'Novel MIMO linear zero dynamic controller for the grid-connected photovoltaic system with weather disturbances', 2013 IEEE Power & Energy Society General Meeting, 2013 IEEE Power & Energy Society General Meeting, IEEE, Vancouver, CANADA.
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Ali, MS, Pota, HR, Mahmud, MA, Hossain, MJ & Roy, NK 1970, 'Stability analysis of grid-connected photovoltaic systems using a linear zero dynamic controller', 2013 IEEE 8th Conference on Industrial Electronics and Applications (ICIEA), 2013 IEEE 8th Conference on Industrial Electronics and Applications (ICIEA 2013), IEEE, Swinburne Univ Technol, Melbourne, AUSTRALIA, pp. 628-633.
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Almarwani, A, Alqarni, L, Hakami, H, Chaczko, Z & Min Xu 1970, 'Door wave home automation system', IET International Conference on Smart and Sustainable City 2013 (ICSSC 2013), IET International Conference on Smart and Sustainable City 2013 (ICSSC 2013), Institution of Engineering and Technology, Shanghai, China, pp. 98-103.
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The technological developments are focused on automation of control systems. Technology is used in homes to create a digital environment such as controlling room temperature, sundry devices, security and lighting. The design of home automation systems is geared towards the automation of processes like remote control of the home environment appliances. The use of Wireless Sensor and Actuators Networks (WSANs) in home automation is a growing trend. WSANs are based on network architecture and protocols in order to enable a network of integrated devices which monitor and control household apparatus.
An, L & Lu, DD-C 1970, 'Design of a single-switch DC-DC converter for PV-battery powered pump system', 2013 1st International Future Energy Electronics Conference (IFEEC), 2013 1st International Future Energy Electronics Conference (IFEEC), IEEE, Tainan, Taiwan, Taiwan, pp. 359-364.
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A single-switch non-isolated DC-DC converter for a PV-battery powered pump system is proposed in this paper. The converter is formed by combining a buck converter with a buckboost converter. This integration also resulted in reduced repeated power processing, hence improving the conversion efficiency. The converter is able to perform maximum power point tracking, and battery charging and to drive the pump, on the condition that the pump can be operated without precise speed requirements. The battery in the converter provides a more steady DC-link voltage as compared to that of a conventional single-stage converter. Experimental results of a 14W laboratory prototype converter confirmed the performance of the proposed converter when used in a PV-battery-pump system. © 2013 IEEE.
Argha, A, Li, L, Su, SW & Hung, N 1970, 'The Application of Discrete Sliding Mode Control in Parabolic PDE Dynamics', 2013 3RD AUSTRALIAN CONTROL CONFERENCE (AUCC), 3rd Australian Control Conference (AUCC), IEEE, Perth, AUSTRALIA, pp. 152-157.
Argha, A, Li, L, Su, SW & IEEE 1970, 'A New Approach to Applying Discrete Sliding Mode Control to 2D Systems', 2013 IEEE 52ND ANNUAL CONFERENCE ON DECISION AND CONTROL (CDC), IEEE Conference on Decision and Control, IEEE, Florence, Italy, pp. 3584-3589.
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Sliding mode control has been applied previously to a specific form of 2D systems (Roesser model). In this paper a new approach (ID vectorial form) is introduced for this problem. Using ID form to represent 2D systems can be used as an alternative strategy to reduce the inherent complexity of 2D systems and their applications. Unlike Wave Advanced Model (WAM) form (proposed by Porter and Aravena), the suggested ID vectorial form, in this paper, has invariable dimension and consequently can be converted to regular form for sliding mode control (SMC). In this paper, the first Fornasini and Marchesini (FM) model of 2D systems which is a second order recursive form is considered. Meantime, the suggested method can be simply deployed to other first or second order 2D models. ©2013 IEEE.
Argha, A, Li, L, Su, SW, Nguyen, H & Australia, E 1970, 'The Application of Discrete Sliding Mode Control in Parabolic PDE Dynamics', 2013 3RD AUSTRALIAN CONTROL CONFERENCE (AUCC), Australian Control Conference, IEEE, Perth, Australia, pp. 152-157.
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In this paper, the problem of applying Discrete Sliding Mode Control (DSMC) on spatially finite-dimensional systems arising from discretization of bi-variate Partial Differential Equations (PDEs) describing spatio-temporal systems is studied. To this end, heat transfer PDE is discretized to create 2D discrete dynamics and eventually this 2D spatiotemporal discrete form is represented in 1D vectorial form. In order to study the effect of discrepancy between original PDE dynamics and their discrete schemes, an uncertainty term is also considered for the obtained discrete dynamics. According to the notion of strong stability and, in addition, using scaling matrices (similarity transformation), a new method for considering the stability of discrete-time systems in the presence of general uncertainty term (matched and unmatched) is developed. It is also shown that the proposed method in this paper can be used for the case with spatial constraints on the actuation. Consequently, as special cases, the problem of spatially piece-wise constant, sparse and also boundary control input are studied. © 2013 Engineers Australia.
Azmat, Z & Tuan, HD 1970, 'Power allocation for Gaussian Mixture model prior knowledge in wirless sensor networks', 2013 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2013 - 2013 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), IEEE, Vancouver, Canada, pp. 5765-5769.
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This paper presents power allocation in nonlinear sensor networks for Gaussian Mixture (GM) information source. The observations of sensors are transmitted through independent Rayleigh flat fading channels to a fusion centre (FC). Transmit Power is optimally allocated to sensor nodes so as to minimize the mean square error (MSE) of estimate at FC. Bayesian linear and optimal nonlinear estimators are deployed at FC to compare the proposed optimal and uniform power allocation among sensors. Extensive simulations validate that the proposed Bayesian linear estimator with optimized power gains effectively works for GM prior distribution
Barua, B, Abolhasan, M, Franklin, DR, Safaei, F & IEEE 1970, 'Outage Probability of Multihop Relay Networks', 2013 9TH INTERNATIONAL WIRELESS COMMUNICATIONS AND MOBILE COMPUTING CONFERENCE (IWCMC), IEEE International Conference on Wireless and Mobile Computing, Networking and Communications, IEEE, Sardinia, Italy, pp. 456-460.
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In this paper we analyze the outage performance of a multihop cooperative relay network where relays in the system can change positions dynamically and use all possible links to forward the message to the next hop over Rayleigh fading channels. We derive the general closed form expression of outage probability and asymptotic coding gain of the network.
Barua, B, Abolhasan, M, Franklin, DR, Safaei, F & IEEE 1970, 'SEP of Multihop Relay Networks in Nakagami-m Fading Channels', 2013 IEEE 78TH VEHICULAR TECHNOLOGY CONFERENCE (VTC FALL), IEEE Vehicular Technology Conference, IEEE, Las Vegas, NV, USA, pp. 1-5.
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In this paper we analyze the error performance of a cooperative multihop parallel relay network over Nakagamim fading channels using M-ary Phase-shift keying (MPSK) modulation. We derive the general closed form expression of the symbol error probability (SEP) and present numerical results on the performance of the network. Copyright © 2013 by the Institute of Electrical and Electronic Engineers, Inc.
Bhattacharya, S, Saha, T & Hossain, MJ 1970, 'Fault current contribution from photovoltaic systems in residential power networks', 2013 Australasian Universities Power Engineering Conference (AUPEC), 2013 Australasian Universities Power Engineering Conference (AUPEC), IEEE, Hobart, AUSTRALIA.
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Biswas, J, Ren Ping Liu, Wei Ni, Collings, IB & Jha, SK 1970, 'Joint channel and delay aware user scheduling for multiuser MIMO system over LTE-A network', 2013 IEEE/ACM 21st International Symposium on Quality of Service (IWQoS), 2013 IEEE/ACM 21st International Symposium on Quality of Service (IWQoS), IEEE, Montreal, QC, Canada, pp. 129-136.
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Existing mobile video applications are continuously driving up the demand for throughput and better quality of service (QoS) for future Long Term Evolution-Advanced (LTE-A) networks. Multi-User Multiple-Input Multiple-Output (MU-MIMO) is one of the most promising technologies that would meet the throughput demand. Unfortunately, existing MU-MIMO schemes do not consider metrics such as delay, and therefore, cannot meet the QoS requirement of delay sensitive applications, such as mobile video. We propose a new cross-layer MU-MIMO scheduling algorithm, which is referred to as joint channel and delay aware user scheduling (CDAUS), satisfies both the throughput and delay requirements. The key idea of the CDAUS algorithm is to select users to form MU-MIMO based on the delay requirements of individual users, as well as their channel correlations. The priority of the users is carefully designed to leverage their delay and throughput. Simulation results show that the proposed CDAUS algorithm is able to reduce the average delay by up to 30% with a marginal 2% sacrifice of throughput, compared to previous work. It also reduces delay variations and improves fairness among the users. © 2013 IEEE.
Cantoni, A, Zhang, J, Huang, X & Guo, YJ 1970, 'Impact of sampling rate on PSD of OFDM signal with SSOP sidelobe suppression', 2013 IEEE 14th Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2013 IEEE 14th Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2013), IEEE, Darmstadt, Germany, pp. 629-633.
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We recently proposed an efficient 'sidelobe suppression with orthogonal projection' (SSOP) scheme for reduction of out-of-band emission of OFDM signals. The SSOP scheme uses a preceding matrix to generate zeros at prescribed frequencies in the sidelobe region and it is numerically observed that its suppression effect is affected by the sampling rate. In this paper, we analytically characterize this effect by considering analog and digital implementations of the SSOP scheme, which correspond to a zero sampling rate and an IFFT implementation with non-zero sampling rates, respectively. Both implementations are modeled and analytical expressions for the corresponding spectra are developed. It is shown that the analytical results match the simulation results very well and the suppression performance is generally proportional to the sampling rate. The analog SSOP-OFDM has true zeros at prescribed frequencies and thus results in significant reduction of out-of-band emissions. The digital implementation does not result in true zeros in the spectrum but nevertheless results in significant sidelobe reduction if the frequency resolution associated with the IFFT is sufficiently high. © 2013 IEEE.
Chaczko, Z & Braun, R 1970, 'Teaching and learning perspective on system development in large teams', 2013 12th International Conference on Information Technology Based Higher Education and Training (ITHET), 2013 12th International Conference on Information Technology Based Higher Education and Training (ITHET), IEEE, Antalya, Turkey, pp. 1-7.
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This paper covers aims and objectives, the approaches, shared experiences and issues faced in teaching and learning of the ICT Analysis and ICT Design pair of subjects within the core block of ICT Engineering courses at the Faculty of Engineering and IT, University of Technology, Sydney (UTS) in Australia. Both practice based subjects, synthesize into a coherent whole, teaching and learning components of all subjects in the ICT Engineering curriculum. One of the main goals of the ICTA and ICTD pair is to close the gap between the students' individualistic tendencies, unplanned and unbudgeted efforts, as well as uncoordinated actions that often characterize teaching and learning approaches to engineering subjects. Additionally, modern industry expects from engineering graduates both leadership skills and team based skills in the development of complex systems. This includes the ability to work in well-planned, process driven, budgeted and coordinated environment. Fundamentally, the course's subjects are adaptive and evolutionary; however, the key challenge is to keep a fine balance between academic concerns and fast changing
Chaczko, Z, Braun, R & Jizan, A 1970, 'A virtual stock exchange simulator for education and training', 2013 12th International Conference on Information Technology Based Higher Education and Training (ITHET), 2013 12th International Conference on Information Technology Based Higher Education and Training (ITHET), IEEE, Antalya, Turkey, pp. 1-6.
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The use of an open-source, virtual stock exchange simulators can be seen as a viable alternative for various learners to train trading practice without risking loses of real funds. At present, there is a shortage of suitable tools that could allow entry level users to engage in a real market trading after gaining a certain degree of confidence from practicing in a both very practical and safe environment. Topics covered in this paper, include shared experiences, challenges as well as common issues related to the design and development of a StockET simulation tool for training and education. The developed open source simulation tool is a robust and highly usable solution that can be used for multiple purposes.
Chaczko, Z, Kirkpatrick, S & Braun, R 1970, 'A web-based solution to collect, manage and analyse Auditory Brainstem Response data', 2013 12th International Conference on Information Technology Based Higher Education and Training (ITHET), 2013 12th International Conference on Information Technology Based Higher Education and Training (ITHET), IEEE, Antalya, Turkey, pp. 1-4.
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Auditory neuroscience often involves the collection of experiment data from test subjects in the form of non-invasive Auditory Brainstem Responses (ABR). These ABRs are most often used to gauge a subjects hearing threshold. Although rarely; they can be analysed further. Research into ABRs has shown that the presence of brain damage or tumours may be detectable. This can be achieved if large amounts of ABRs are collected and compared. However many laboratories around the world do not keep the data as it is difficult to store and analyse, and sometimes only used for threshold analysis. This results in a huge amount of wasted data and opportunity. The goal of this project was to develop and build a web-based system to collect, manage and analyse ABR data for hearing research. The project was run as an iterative process based on the eXtreme-Programming (XP) methodology. It involved very close contact with the client laboratory. Onsite weekly meetings, demonstrations and experiments were attended to help understand the problem domain. A continuous analysis, design and integration cycle coupled with automated testing and deployment was used throughout the project. Where possible all key aspects of XP development were adhered to and the project managed in this fashion. The final OpenABR system was deployed to a cloud server and is being used by the client laboratory. It has several unique features that no other system of its type possesses. Its dynamic database interface allows scientists the flexibility and reliability they cannot get from standard databases. Future work would focus on expanding the dynamic database interface, integrating more analysis including heuristics and trying to include new data types such as imaging results. © 2013 IEEE.
Chai, R, Ling, SH, Hunter, GP, Tran, Y, Nguyen, HT & IEEE 1970, 'Classification of Wheelchair Commands using Brain Computer Interface: Comparison between Able-Bodied Persons and Patients with Tetraplegia', 2013 35TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), International Conference of the IEEE Engineering in Medicine and Biology Society, IEEE, Osaka, Japan, pp. 989-992.
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This paper presents a three-class mental task classification for an electroencephalography based brain computer interface. Experiments were conducted with patients with tetraplegia and able bodied controls. In addition, comparisons with different time-windows of data were examined to find the time window with the highest classification accuracy. The three mental tasks used were letter composing, arithmetic and imagery of a Rubiks cube rolling forward; these tasks were associated with three wheelchair commands: left, right and forward, respectively. An eyes closed task was also recorded for the algorithms testing and used as an additional on/off command. The features extraction method was based on the spectrum from a Hilbert-Huang transform and the classification algorithm was based on an artificial neural network with a fuzzy particle swarm optimization with cross-mutated operation. The results show a strong eyes closed detection for both groups with average accuracy at above 90%. The overall result for the combined groups shows an improved average accuracy of 70.6% at 1s, 74.8% at 2s, 77.8% at 3s, 79.6% at 4s and 81.4% at 5s. The accuracy for individual groups were lower for patients with tetraplegia compared to the able-bodied group, however, does improve with increased duration of the time-window.
Chaiwongsai, J, Chiracharit, W, Chamnongthai, K, Miyanaga, Y & Higuchi, K 1970, 'Tone model enhancement for low complexity tone recognition', 2013 World Congress on Sustainable Technologies (WCST), 2013 World Congress on Sustainable Technologies (WCST), IEEE.
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Chan, KY, Ramer, R & Guo, YJ 1970, 'Switchable waveguide iris filter using planar dipoles', 2013 IEEE MTT-S International Microwave Symposium Digest (MTT), 2013 IEEE/MTT-S International Microwave Symposium - MTT 2013, IEEE, Seattle, WA, USA.
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A new concept of switching on and off high Q-factor bandpass filters is presented. Cheap, planar, low Q-factor circuits are proposed to disable 3D filters Reconfigurable dipoles are used to disable resonance and turn the filter off, rather than adjusting the resonance frequency or coupling. Here wire bonded dipoles on quartz substrates inside the waveguide structure are used for switching the bandpass filters. 3-pole bandpass filters are proposed for concept demonstration The dipoles are inserted in each cavity of the iris waveguide filter. Central frequency is 24GHz and bandwidth 500MHz. Simulation results show good performance. The fabricated filter shows good correlation between the measured and simulated performance. The bandpass response is completely off, when the dipoles are "switched on"/connected with bondwires, confirming the introduced concept. The insertion loss is expected to be significantly reduced by choosing a superior fabrication method of the waveguide. © 2013 IEEE.
Chan, KYE, Ramer, R & Guo, YJ 1970, 'RF MEMS millimeter-wave switchable bandpass filter', 2013 IEEE International Wireless Symposium (IWS), 2013 IEEE International Wireless Symposium (IWS), IEEE, Dresden, Germany.
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A switchable bandpass filter that can operate between 60 GHz and E-band spectrum, capable of providing good channel isolation is presented. A RF MEMS SPDT is designed for the switching element between the two bands. Back-to-back cantilever switches are used for maximum isolation. New circuit models for the inductively coupled inverters and short circuit stubs are proposed. Measurement results show good correlation to our simulations. Better than 15 dB return loss and 5 dB insertion loss in both 60 GHz and Eband are measured. With the introduction of transmission zero, rejection between the two operational bands is better than 20 dB. © 2013 IEEE.
Changliang Zheng, Dutkiewicz, E, Ren Ping Liu, Vesilo, R & Zheng Zhou 1970, 'Efficient data transmission with random linear coding in multi-channel cognitive radio networks', 2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013 IEEE Wireless Communications and Networking Conference (WCNC), IEEE, Shanghai, China, pp. 77-82.
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Efficient data transmission in cognitive radio networks (CRNs) is critical for cognitive radio (CR) users to communicate with each other in an opportunistic manner. Even with successful access to required channels, the transmission could still suffer from failures due to channel fading. In this paper, we propose a random linear coded scheme for efficient data transmission in multi-channel CRNs under practical fading channel conditions. We develop theoretical analysis and derive general form solutions for the batch delay associated with the proposed scheme. We also use our theoretical model to analyze the performances of two multi-channel automatic repeat request (ARQ) based schemes. Simulation results validate the analysis and show that the coded scheme outperforms the ARQ based schemes in terms of batch transmission delay. Additionally, the coded scheme is less dependent on feedback channels than the other schemes. © 2013 IEEE.
Che, E & Tuan, HD 1970, 'Interference mitigation by jointly splitting rates and beamforming for multi-cell multi-user networks', 2013 13th International Symposium on Communications and Information Technologies (ISCIT), 2013 13th International Symposium on Communications and Information Technologies (ISCIT), IEEE, Surat Thani, Thailand, pp. 41-45.
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The paper considers the joint design for splitting bit rates in private and common message transmissions and coordinated beamforming in a multi-cell multi-user multiple input single output (MISO) system. Namely, the users are purposely paired to decode the common messages to subtract interferences. Both the private messages and common messages are further beamformed before the transmission to maximize the worst user's rate performance of the overall system. The common messages and private messages are decoded in sequence. Obviously, users pairing optimization alone already is a nontrivial combinatorics, while beamforming private and common messages also pose a difficult nonconvex optimization problem. Their jointly optimal design is thus a hard mixed combinatoric optimization problem. Nevertheless, we show that this joint design can be successfully addressed by means of d.c (difference of convex functions) optimization. Numerical simulation shows the advantage of our approach over the previous one. © 2013 IEEE.
Che, E & Tuan, HD 1970, 'Optimized coordinated precoding in multicell MIMO wireless systems', 2013 13th International Symposium on Communications and Information Technologies (ISCIT), 2013 13th International Symposium on Communications and Information Technologies (ISCIT), IEEE, Surat Thani, Thailand, pp. 188-191.
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This paper is concerned with downlink transmissions in coordinated multiple-input multi-output (MIMO) multicell wireless networks. The design of the transmit precoding matrices in this paper aims at the maximin optimization of user rates subject to realistic power constraints at the transmitters. This problem is a nonconvex objective function subject to convex constraints with respect to high-dimensional matrix variables. Up to date, a closed-form solution has not been properly proposed. Nevertheless, we show the objective functions can be analytically represented by d.c. (difference of two convex) functions. A simple but very efficient d.c. iterative algorithm (DCI) with guaranteed convergence is shown to locate the approximately optimal matrix solutions with the help of only a few converging semi-definite programs (SDP). © 2013 IEEE.
Chen, L & Hoang, DB 1970, 'Adaptive Data Replicas Management Based on Active Data-centric Framework in Cloud Environment', 2013 IEEE 10th International Conference on High Performance Computing and Communications & 2013 IEEE International Conference on Embedded and Ubiquitous Computing, 2013 IEEE International Conference on High Performance Computing and Communications (HPCC) & 2013 IEEE International Conference on Embedded and Ubiquitous Computing (EUC), IEEE, Zhangjiajie, China.
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Cloud data protection is increasingly attracting researchers attention. Cryptographic-based schemes, trust third party technologies, policy-driven frameworks, and data-policy binding mechanisms have been proposed to address data security and privacy issues from many aspects of data protection requirement. However, due to the inevitability of bugs, crashes, operator errors, hardware failure, or server misconfiguration, data availability and reliability might be still compromised. To avoid data loss and access failure when the unpredictable incidents occur, data replication technology is essential to guarantee the availability and reliability. This paper introduces the adaptive data replicas management based on the novel data structure created by the active data-centric framework in the cloud scenario. The simulated result shows the effectiveness and flexibility of the proposed adaptive data replicas scheme.
Chen, L, Hoang, DB & IEEE 1970, 'Addressing data and user mobility challenges in the cloud', 2013 IEEE SIXTH INTERNATIONAL CONFERENCE ON CLOUD COMPUTING (CLOUD 2013), IEEE International Conference on Cloud Computing, IEEE, Santa Clara, CA, pp. 549-556.
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Recently cloud computing has been increasingly gaining attention and spreading in various industries. This novel paradigm also has received significant research focus on the data security and privacy issues due to its outsourced nature. However, few of the research efforts have been focused on data mobility issues which existed intrinsically in highly complex and dynamic cloud services. To address this challenge, this paper discusses full mobility management of cloud data from two aspects: data mobility management and user mobility management. The work is based on our previously proposed active data-centric framework. Taking advantage of this framework, the active data can establish an active binding relationship with its user. Any data mobility-related behavior could inform to its bundled user instantly and safely. The paper also discusses user mobility management via the self-adaptable heterogeneous network handoff mechanism to ensure the ubiquitous informing service in the mobile cloud environment. The experimental outcomes demonstrate the feasibility, proactivity, and efficiency by the full mobility management scheme.
Chen, XY, Jin, JX, Zhou, X, Guo, YG, Zhu, JG, Xin, Y, Zhang, JY & Xu, W 1970, 'Design and experiment of a bridge-type chopper for low-voltage SMES application', 2013 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, 2013 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD), IEEE, Biejing, China, pp. 1-2.
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A new bridge-type chopper topology using MOSFETs is proposed and studied for superconducting magnetic energy storage (SMES) applications for use in low-voltage end-user sides. Both the bridge-type and conventional choppers are theoretically analyzed and experimentally compared. The dynamic energy exchange characteristics of SMES for solving the voltage swell and voltage sag problems are presented. The results obtained demonstrate that the bridge-type chopper has higher energy utilization efficiency than the conventional one.
Cheng, P, Chen, Z, Gui, L, Guo, YJ, Tao, M & Rui, Y 1970, 'Distributed sparse channel estimation for OFDM systems with high mobility', 2013 IEEE International Conference on Communications (ICC), ICC 2013 - 2013 IEEE International Conference on Communications, IEEE, Budapest, Hungary, pp. 4951-4956.
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Channel estimation for an orthogonal frequency-division multiplexing (OFDM) broadband system operating with high mobility is very challenging. This is mainly due to the significant Doppler spread, inherent in a time-frequency doubly-selective (DS) channel. Consequently, a large number of channel coefficients must be estimated, forcing the need for allocating a large number of pilot subcarriers. To address this problem, we propose a novel channel estimation method based on basis expansion models (BEMs) and distributed compressive sensing (DCS) theory. To be specific, we develop a two-stage sparse BEM coefficients estimation method, which can effectively combat the Doppler spread and enable accurate channel estimation with dramatically reduced number of pilot subcarriers. The numerical results reveal that, in a typical LTE system configuration, the proposed scheme can increase the spectral efficiency by 40% and achieve a 6 dB gain in terms of normalized mean square error (NMSE), both compared to the conventional scheme. © 2013 IEEE.
Cheng, P, Chen, Z, Qiu, C, Gui, L, Guo, YJ & Rui, Y 1970, 'Stream Maximization Transmission for MIMO Systems with Limited Feedback Unitary Precoding', 2013 IEEE 77th Vehicular Technology Conference (VTC Spring), 2013 IEEE 77th Vehicular Technology Conference (VTC Spring), IEEE.
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Limited feedback precoding (LFP) significantly improves multiple-input multiple-output (MIMO) spatial multiplexing link reliability with a small amount of feedback from the receiver back to the transmitter. One of the key problems linked to LFP is how to select an optimal precoder from a predetermined unitary codebook. We find that the conventional precoder selection criteria are not applicable to the stream maximization transmission (SMT) mode with linear receivers, including zero forcing (ZF) and minimum mean square error (MMSE) decoders. To solve this issue, a novel singular value decomposition (SVD) based precoder selection criterion is proposed in this paper. This criterion features a unified structure for all the linear receivers such as ZF and MMSE decoders, and is shown by simulation to provide significant coding gains in various SMT systems. With the same complexity as the conventional one, the proposed criterion could find its applications in next generation systems employing SMT spatial multiplexing, significantly improving system performance with affordable feedback requirement. © 2013 IEEE.
Chye, YH, Dutkiewicz, E, Vesilo, R & Liu, RP 1970, 'A QoS-aware cross-layer scheduling scheme for multiuser mixed-traffic cognitive radio networks', 2013 13th International Symposium on Communications and Information Technologies (ISCIT), 2013 13th International Symposium on Communications and Information Technologies (ISCIT), IEEE, Surat Thani, Thailand, pp. 615-620.
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The emerging technology of cognitive radio (CR) allows secondary users (SUs) to gain access to radio spectrum which is licensed to but temporarily unoccupied by primary users (PUs). Apart from spectrum sensing, dynamic spectrum access (DSA) is an important processing task for CR networks (CRNs). Its aim is to allocate spectrum for SUs dynamically without causing any harm to PUs. CRNs may support different traffic types that may have different quality of service (QoS) requirements. In order to meet these QoS requirements, channel states, queue states and traffic types should be taken into account in designing DSA schemes. However, traffic types handled by SUs are treated equally in most existing DSA schemes. We propose a cross-layer scheduling scheme by incorporating DSA, packet scheduling and a channel sharing policy to achieve efficient QoS support for SUs with different traffic types. QoS performance of the proposed scheduling scheme is evaluated in terms of average throughput, average packet delay and packet dropping probability for SUs with different traffic types. Simulation results show that the proposed scheduling scheme outperforms the conventional scheduling scheme by providing more efficient QoS support for SUs and higher throughput fairness among SUs as the PU's activity factor increases. © 2013 IEEE.
Chye, YH, Dutkiewicz, E, Vesilo, R & Liu, RP 1970, 'QoS-aware cross-layer scheduling for cognitive radio networks with heterogeneous data traffic', 2013 Australasian Telecommunication Networks and Applications Conference (ATNAC), 2013 Australasian Telecommunication Networks and Applications Conference (ATNAC), IEEE, Christchurch, New Zealand, pp. 213-218.
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Cognitive radio (CR) has been an enabling technology for secondary users (SUs) to efficiently exploit radio spectrum underutilized by primary users (PUs). To avoid downgrading PUs' performance, dynamic spectrum access (DSA) plays an important role in CR networks (CRNs) for adaptively assigning spectrum to SUs. During spectrum handover to PUs, quality of service (QoS) of SUs may not be satisfied due to high competition among SUs with different traffic types. However, in most existing DSA schemes, traffic types handled by SUs are treated equally. To achieve QoS satisfaction for SUs with heterogeneous traffic, this paper proposes a new cross-layer scheduling that jointly considers DSA, packet scheduling and a channel sharing policy. QoS performance of the cross-layer scheduling is measured in terms of average throughput, average packet delay and dropping probability for SUs with different traffic types. QoS support for SUs provided by the proposed scheduling scheme incorporating the channel sharing policy is shown to be more efficient and balanced compared to existing scheduling schemes. © 2013 IEEE.
Conneely, M, McGloin, D, Robertson, P, Irwin McLean, WH & Campbell, P 1970, 'A nano-mechanical study on the influence of ultrasound exposure on cellular elasticity', 2013 IEEE International Ultrasonics Symposium (IUS), 2013 IEEE International Ultrasonics Symposium (IUS), IEEE, Prague, CZECH REPUBLIC, pp. 390-392.
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Cook, AJ, Redmond, SJ, Gargiulo, GD & Hamilton, TJ 1970, 'Techniques for measuring energy expenditure with portable devices', IEEE 2013 Tencon - Spring, 2013 IEEE TENCON Spring Conference, IEEE, IEEE New S Wales Sect, Sydney, AUSTRALIA, pp. 39-42.
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Cruz-Sanchez, H, Ciarletta, L, Song, YQ & Nanda, P 1970, 'Routing scheme for a wireless sensor network real-time locating system', 2013 9th International Wireless Communications and Mobile Computing Conference, IWCMC 2013, 2013 9th International Wireless Communications and Mobile Computing Conference (IWCMC 2013), IEEE, Cagliari, Italy, pp. 159-164.
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This work contains a routing proposition to be used over a Wireless Sensor Network (WSN) location system based on the IEEE 802.15.4 standard. The technical solution for communication consists of an n-ary tree algorithm for routing using a 16 bit addressing scheme. It is compared to a binary routing scheme originally used on a real system which suffers from coverage, routing and addressing problem. An analysis of the coverage aspects is driven by a geometric study. It includes an analysis of a generated topology for different coverage areas and different routing topologies. The geometric analysis is validated by a simulation work. We observe that the proposed scheme outperforms the existing routing solution in terms of hop-count, delay and association process time. The work puts in evidence that the Connectivity of the network is an important parameter to be considered during the network deployment and for the routing scheme. © 2013 IEEE.
Dear, RD, Burnham, DR, Summers, MD, McGloin, D & Ritchie, GAD 1970, 'Axial Localization Improvements when Trapping Aerosol Droplets using an Annular Beam', Optics in the Life Sciences, Optical Trapping Applications, OSA.
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We demonstrate that annular beam traps lead to an increased size range and improved axial trapping of aerosols in comparison to Gaussian beam traps. These methods are extended to consider ionic liquid samples. © 2013 The Optical Society (OSA).
Dehestani, D, Su, S, Nguyen, H & Guo, Y 1970, 'Robust fault tolerant application for HVAC system based on combination of online SVM and ANN black box model', 2013 European Control Conference (ECC), 2013 European Control Conference (ECC), IEEE, Zurich, Switzerland, pp. 2976-2981.
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Efficient heating, ventilation, and air-conditioning (HVAC) systems are one of the big challenges today around the world. The fault detection and isolation (FDI) play a significant role in the monitoring, repairing and maintaining of technical systems for the final destination of cost reduction. FDI makes it possible to reduce total cost effective of maintenance and thus increase the capacity utilization rates of equipment. Reduction of energy wasting in the system by on time fault detection is another goal. Therefore, this work proposes a new fault detector based on a black box Artificial Neural Network (ANN) model and online support vector machines (SVM) classifier which integrates a dimension reduction scheme to analyze the failure of air fan supply and dampers fault. The key advantage of this algorithm is to make robustness for SVM to recognize a faulty condition with unexpected sensors values. The ANN generates a high accurate model which is based reference for SVM classifier. Now by using this black box model we make possibility of robustness for SVM to increase detection probability. Finally, a series of faulty experimental data are applied to evaluate the effectiveness of the robust classifier. Final results show that online SVM can detect accurately the air supply fan fault and damper fault of a HVAC system with minimum usage data. It is also outperforms offline SVM on such energy systems for classification.
Ding, C, Guo, YJ, Qin, PY, Bird, TS & Yang, Y 1970, 'A novel phase shifter based on reconfigurable defected microstrip structure (RDMS) for beam-steering antennas', ISAP 2013 - Proceedings of the 2013 International Symposium on Antennas and Propagation, IEEE International Symposium on Antennas and Propagation, IEEE, Nanjing, China, pp. 993-996.
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A low cost phase shifter based on a cascaded reconfigurable defected microstrip structure (RDMS) is proposed. This RDMS unit is produced by etching a slot to introduce a defect on a microstrip line and then PIN diodes are inserted in the defected area. By switching the PIN diodes, the RDMS unit is able to operate in two different states with a phase shift of 17° at 5.2 GHz. The RDMS units can be cascaded for higher phase shift values that may be determined by array design requirements. Phase shifters cascading three and six RDMS units were designed, fabricated, and measured. The measured results show that the two phase shifters introduce 45° and 90° phase shifts, respectively, with low insertion loss. Finally, a four element patch array is proposed with a beamforming network employing the phase shifters and Wilkinson power dividers. The array is able to switch its main beam direction to 0° and ±20° in the H plane and the impedance bandwidth covers the overlapping wireless local area network (WLAN) bands in the vicinity of 5.2 GHz. © 2013 Antenna Society of the Chinese Institute of Electronics.
ding, J, Dutkiewicz, E & Huang, X 1970, 'Energy Efficient Cooperative Communication for UWB Based In-Body Area Networks', Proceedings of the 8th International Conference on Body Area Networks, 8th International Conference on Body Area Networks, ACM, Boston, Massachusetts, pp. 29-34.
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© 2013 ICST 978-1-936968-89-3. In this paper, we study the energy efficiency of single relay cooperative transmission for ultra-wideband (UWB) based in-body area networks (IBANs). A simple relay-based cooperative IBAN system model is introduced first. With a target threshold of the received signal-to-noise ratio (SNR), outage probabilities for direct and cooperative transmissions are derived respectively. Afterwards, the average energy consumption per bit is given for both transmission schemes. The optimal relay location for cooperation is also derived and analyzed to minimize the average bit energy consumption. Simulation verifies the analysis and shows that cooperative transmission can achieve a satisfactory improvement on energy efficiency compared with direct transmission over a range of relay locations for UWB based IBANs. The improvement is more significant with a higher SNR threshold or with the implanted sensor having a deeper depth inside the body.
Ding, J, Dutkiewicz, E, Huang, X & Fang, G 1970, 'Energy-efficient cooperative relay selection for UWB based body area networks', 2013 IEEE International Conference on Ultra-Wideband (ICUWB), 2013 IEEE International Conference on Ultra-Wideband (ICUWB), IEEE, Sydney, NSW, Australia, pp. 97-102.
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In this paper, an energy-efficient cooperative relay selection scheme is investigated for ultra-wideband (UWB) based wireless body area networks (WBANs). With a realistic nonlinear energy consumption model, the energy consumption for single-relay cooperation is established and the optimal power allocation for cooperation is derived accordingly to minimize the total energy consumption at a given relay location. Afterwards, an energy efficient relay selection criterion is described in detail. Simulation results verify the suitability of the criterion and show that, with the same desired spectral efficiency (SE), direct transmission is preferable for energy saving when the transmitter and receiver are located on the same side of the human body. However, at a suitable relay location and with large transmission distance, cooperative transmission can achieve a significant improvement on energy efficiency compared with direct transmission when the transmitter and receiver are located on the different sides of the human body. © 2013 IEEE.
Franco, M, Guiza, J, Chiappetta, E, Rueda, S, Luis, H, Bertuzzo, J, Koeppe, J, Robins, T, Jenkins, J & Hamilton, T 1970, 'Electronically programmable test points for on-chip analog/digital measurements', 2013 IEEE International Symposium on Circuits and Systems (ISCAS2013), 2013 IEEE International Symposium on Circuits and Systems (ISCAS), IEEE, pp. 2670-2673.
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This paper presents a flexible solution for performing measurements of internal chip signals at the bench, which reduces overall system costs and test risks. It also makes available a way to insert signals at predefined nodes and to bring the system to a specified state. For this purpose, we use a Serial-to-Parallel Interface (SPI) block with a simple communication protocol, which enables the designer to reconfigure as many internal test structures as desired, as well as to drive different internal signals to or from the chip pads. As these pads are reconfigurable, their number can be reduced to a minimum, which in turn reduces silicon area and die cost. The need to use physically intrusive micro probes is reduced and, most importantly, it allows the possibility to acquire internal signals of fully encapsulated dies. © 2013 IEEE.
Furqan, F & Hoang, DB 1970, 'Wireless Fair Intelligent Admission Control - WFIAC', 2013 IEEE 27TH INTERNATIONAL CONFERENCE ON ADVANCED INFORMATION NETWORKING AND APPLICATIONS (AINA), International Conference on Advanced Information Networking and Applications (was ICOIN), IEEE, Barcelona, Spain, pp. 1001-1008.
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In next generation wireless networks like WiMAX, a dynamic Call Admission Control (CAC) plays an important role to ensure Quality of Service (QoS) of existing users and to efficiently utilize network resources. We propose a predictive CAC namely Wireless Fair Intelligent Admission Control (WFIAC) that admits or rejects a new incoming connection base on resource availability and load in the network. The proposed CAC works in conjunction to a load control module namely WiMAX Fair Intelligent Congestion Control (WFICC) to determine load in network. The proposed CAC is based on bandwidth borrowing and degradation of over provisioned connections in order to minimize blocking probability and to maximize resource utilization in the network. Once the network load reduces, WFICC upgrades the bandwidth allocated to connections that have data to send. So, WFIAC along with WFICC ensures the network operates around a target operating point to guarantee QoS to end users. A detailed and comprehensive simulation is performed in ns-2 to show the efficiency of the proposed CAC scheme in terms of blocking probability of different service classes and QoS provisioning to existing connections when the network is in congested and non congested state.
Furqan, F, Hoang, DB & IEEE 1970, 'WFICC: A New Mechanism for Provision of QoS and Congestion Control in WiMAX', 2013 IEEE CONSUMER COMMUNICATIONS AND NETWORKING CONFERENCE (CCNC), IEEE Consumer Communications and Networking Conference, IEEE, Las Vegas, USA, pp. 552-558.
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In WiMAX architecture the base station lacks the mechanisms to avoid it from being overloaded, which can lead to degradation in the Quality of service (QoS) experienced by the users in the cell, as the large queue at buffer risk high delays and buffer ov
Gay, V, Leijdekkers, P & Wong, F 1970, 'Using sensors and facial expression recognition to personalize emotion learning for autistic children.', Stud Health Technol Inform, International Conference on Wearable Micro and Nano Technologies for Personalized Health, New IOS Press Publication, Netherlands, pp. 71-76.
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This paper describes CaptureMyEmotion, an app for smartphones and tablets which uses wireless sensors to capture physiological data together with facial expression recognition to provide a very personalized way to help autistic children identify and understand their emotions. Many apps are targeting autistic children and their carer, but none of the existing apps uses the full potential offered by mobile technology and sensors to overcome one of autistic children's main difficulty: the identification and expression of emotions. CaptureMyEmotion enables autistic children to capture photos, videos or sounds, and identify the emotion they felt while taking the picture. Simultaneously, a self-portrait of the child is taken, and the app measures the arousal and stress levels using wireless sensors. The app uses the self-portrait to provide a better estimate of the emotion felt by the child. The app has the potential to help autistic children understand their emotions and it gives the carer insight into the child's emotions and offers a means to discuss the child's feelings.
Gay, V, Leijdekkers, P, Agcanas, J, Wong, F & Wu, Q 1970, 'CaptureMyEmotion: Helping autistic children understand their emotions using facial expression recognition and mobile technologies', 26th Bled eConference - eInnovations: Challenges and Impacts for Individuals, Organizations and Society, Proceedings, Bled eConference - eInnovations: Challenges and Impacts for Individuals, Organizations and Society, Proceedings, AIS Electronic Library (AISeL), Bled, Slovenia, pp. 409-420.
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One of the main challenges for autistic children is to identify and express emotions. Many emotion-learning apps are available for smartphones and tablets to assist autistic children and their carers. However, they do not use the full potential offered by mobile technology, such as using facial expression recognition and wireless biosensors to recognise and sense emotions. To fill this gap we developed CaptureMyEmotion, an Android App that uses wireless sensors to capture physiological data together with facial expression recognition to provide a very personalised way to help autistic children learn about their emotions. The App enables children to capture photos, videos or sounds, and simultaneously attach emotion data and a self-portrait photo. The material can then be reviewed and discussed together with a carer at a later stage. CaptureMyEmotion has the potential to help autistic children integrate better in the society by providing a new way for them to understand their emotions.
Gay, VC, Leijdekkers, P & Wu, Q 1970, 'Helping Autistic Children Understand Their Emotions Using Facial Expression Recognition and Mobile Technologies', Proceedings of the 26th Bled eConference eInnovations, Bled eConference, AISeL, Bled, Slovenia, pp. 409-420.
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One of the main challenges for autistic children is to identify and express emotions. Many emotion-learning apps are available for smartphones and tablets to assist autistic children and their carers. However, they do not use the full potential offered by mobile technology, such as using facial expression recognition and wireless biosensors to recognise and sense emotions. To fill this gap we developed CaptureMyEmotion, an Android App that uses wireless sensors to capture physiological data together with facial expression recognition to provide a very personalised way to help autistic children learn about their emotions. The App enables children to capture photos, videos or sounds, and simultaneously attach emotion data and a self-portrait photo. The material can then be reviewed and discussed together with a carer at a later stage. CaptureMyEmotion has the potential to help autistic children integrate better in the society by providing a new way for them to understand their emotions.
Geyer, T, Aguilera, RP & Quevedo, DE 1970, 'On the stability and robustness of model predictive direct current control', 2013 IEEE International Conference on Industrial Technology (ICIT), 2013 IEEE International Conference on Industrial Technology (ICIT 2013), IEEE, Cape Town, South Africa, pp. 374-379.
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Model predictive direct current control (MPDCC) has emerged as a promising control scheme for high-power power electronic applications, achieving very low current distortion levels and fast dynamic responses. This is achieved by addressing the current control and the modulation problems in one computational stage. For MPDCC the issue of closed-loop stability has not yet been investigated. In this paper, it will be shown that the MPDCC algorithm guarantees stability, i.e. the load currents are moved into given bounds and kept inside of these bounds. It will also be shown that - by slightly modifying the MPDCC algorithm - robustness to parameter uncertainties can be established. © 2013 IEEE.
Gomez-Tornero, JL, Goussetis, G & Guo, J 1970, 'Metasurfing substrate integrated waveguides to mold the radiation from Leaky Waves', Progress in Electromagnetics Research Symposium, Progress in Electromagnetics Research Symposium (PIERS), pp. 206-211.
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We show our latest developments in the application of the meta surfing concept to Substrate Integrated Waveguide (SIW) technology. It is described how this simple and versatile guiding medium can be conveniently modified and modulated to control the conversion from the conventional TE10 propagating mode to surface or leaky wave with tailored propagation and radiation features. Theoretical aspects and practical designs are described with the general objective of wavefront control (both in amplitude and phase), showing results at Ku band (12-18 GHz) and W band (75-111 GHz), and illustrating a wide range of physical phenomena and interesting potential applications.
Guo, YG, Jin, JX, Zhu, JG & Lu, HY 1970, 'Performance Analysis of a Linear Motor with HTS Bulk Magnets for Driving a Prototype HTS Maglev Vehicle', Applied Mechanics and Materials, Linear Drives for Industry Applications, Trans Tech Publications, Ltd., Hangzhou, China, pp. 33-37.
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This paper presents the performance analysis of a linear synchronous motor which employs high-temperature superconducting (HTS) bulk magnets on the mover and normal copper windings on the stator. The linear motor is designed to drive a prototype HTS maglev vehicle in which the mover is suspended by the levitation force between HTS bulks on the mover and permanent magnets on the ground. Finite element magnetic field analysis is conducted to calculate the major parameters of the linear motor and an equation is derived to calculate the electromagnetic thrust force. Theoretical calculations are verified by the measured results on the prototype.
Guo, YG, Zeng, JB, Zhu, JG, Lu, HY & Jin, JX 1970, 'B-H relations of magnetorheological fluid under 2-D rotating magnetic field excitation', 2013 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, 2013 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD), IEEE, Biejing, China, pp. 94-97.
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This paper presents the investigation of the B-H relations of a magnetorheological (MR) fluid under one-dimensional (1-D) alternating and two-dimensional (2-D) rotating magnetic field excitations where B is magnetic flux density and H is magnetic field strength. The measurement is carried out by using a single sheet tester with an MR fluid sample. The measurement principle and structure of the testing system are described. The calibration of the B and H sensing coils are also reported. The relations between B and H on the MR fluid sample under 2-D rotating magnetic field excitations have been measured and compared with the results under 1-D excitations showing that the B-H relations under 2-D excitations are significantly different from the 1-D case. These data would be useful for design and analysis of MR smart structures like MR dampers. © 2013 IEEE.
Guo, YJ & Gomez-Tornero, JL 1970, 'Reconfigurable Fabry-Pérot Leaky-Wave Antennas', 2013 International Workshop on Antenna Technology (iWAT), 2013 International Workshop on Antenna Technology (iWAT), IEEE, Karlsruhe, Germany, pp. 390-393.
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Beam scanning is an inherent property of Leaky-Wave Antennas (LWAs). It is usually achieved by sweeping the operating frequency. For wireless communications, however, it is necessary for the antenna to operate at a fixed frequency while scanning. With one dimensional LWAs, this can be done by electronically reconfiguring the leaky-line boundary condition. By altering the leaky-mode complex propagation constant, one can produce a desired scanning beam. To this end, a number of ideas have been investigated and reported in recent years, including the use of PIN diodes and photosensitive switches. The most used active device for electronically controlling 1D LWAs in microwave frequencies is the varactor diode, which has been applied to a multitude of leaky lines such as the slotline, the coplanar waveguide, the microstrip log-periodic line, the half-mode microstrip line , and the half-mode substrate-integrated waveguide. © 2013 IEEE.
Guo, YJ, Qin, P-Y, Bird, TS & IEEE 1970, 'Reconfigurable Antennas for Wireless Communications', 2013 7TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP), European Conference on Antennas and Propagation, IEEE, Gothenburg, Sweden, pp. 165-168.
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An overview of CSIRO's research on frequency, polarization and pattern reconfigurable antennas for wireless communications is presented. We report the latest progress in antennas that can reconfigure several characteristics simultaneously as well as reconfigurable leaky-wave antennas.
Guzman-Quiros, R, Gomez-Tornero, JL, Garcia-Vigueras, M, Weily, AR & Guo, YJ 1970, 'Advances in electronically reconfigurable LWAs in Fabry-Pérot and SIW technologies', 2013 7th European Conference on Antennas and Propagation, EuCAP 2013, pp. 2001-2005.
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This paper gives an overview of our most recent research results on reconfigurable leaky-wave antennas (LWAs), which have been developed at Universidad Politécnica de Cartagena (Spain) and CSIRO ICT Centre (Australia). Fabry-Pérot and Substrate Integrated Waveguide (SIW) technologies are studied to propose new reconfigurable leaky-wave topologies for beamforming applications. © 2013 EurAAP.
Ha, QP, Vakiloroaya, V & IEEE 1970, 'A New Single-Effect Hot-Water Absorption Chiller Air Conditioner using Solar Energy', 2013 AUSTRALASIAN UNIVERSITIES POWER ENGINEERING CONFERENCE (AUPEC), Australasian Universities Power Engineering Conference, IEEE, Hobart, Australia, pp. 1-6.
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This study presents the analysis and performance evaluation of a newly-developed solar-powered, hot-water single-effect absorption chiller air conditioning system. The system is, to our knowledge, the first vapor-absorption cooling plant fully powered by a renewable energy source with solar radiation, in which no water storage and auxiliary heat exchanger are used. The 6 kW Li-Br water system has been designed and tested to predict its performance. The influence of chilled water, cooling tower water and solar collector hot water temperatures on the system performance is investigated. Our experimental results demonstrate the technical viability of the proposed system in meeting the air-conditioning demand while addressing directly critical issues of electricity consumption and greenhouse gas emissions.
Habibullah, M & Lu, DD-C 1970, 'Predictive torque and flux control of a four-switch inverter-fed IM drive', 2013 1st International Future Energy Electronics Conference (IFEEC), 2013 1st International Future Energy Electronics Conference (IFEEC), IEEE, Tainan, Taiwan, Taiwan, pp. 629-634.
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This paper presents torque and flux control of induction motor (1M) drive fed by a four-switch three phase inverter (FSTPI). Finite-state model predictive control (FSMPC) strategy is used to select the switching states of the inverter. The proposed controller reduces cost of the inverter, the switching losses, and the prediction time of the control algorithm as compared with conventional six-switch three phase inverter (FSTPI) based two-level voltage source inverter (VSI). Since modern digital signal processors (DSPs) support high sampling frequency, FS-MPC based FSTPI produces almost balanced stator phase currents. This paper also proposes a least square based normalized cost function giving priority on stator flux in relation to the torque. The effectiveness of the proposed cost function is compared with the conventional normalized and ranking based cost functions. Simulation results on steady state and dynamic operation have revealed that, FSTPI fed 1M drive exhibits good torque and flux behavior. © 2013 IEEE.
Hagelstein, B, Abolhasan, M, Franklin, D, Safaei, F & IEEE 1970, 'A General Performance Model for MAC Layer Cooperative Retransmission Contention Protocols', 2013 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM), IEEE Global Telecommunications Conference, IEEE, Atlanta, USA, pp. 1584-1589.
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Cooperative retransmission schemes can significantly improve transmission reliability and performance over high loss and time-varying links. However, analytically comparing performance between retransmission strategies is challenging and generally requires simplistic assumptions. This paper presents a general model for the performance of distributed, slot-based contention algorithms for opportunistic decode and forward retransmission algorithms. The model is independent of specific modulation or coding schemes and may be adapted to suit statebased transmission probability models. The model is validated through QualNet simulations.
Han, Z, Safavi-Naeini, M, Petasecca, M, Cutajar, D, Lerch, M, Franklin, DR, Jakubek, J, Zemlicka, J, Pospisil, S, Bucci, JA, Zaider, M, Rosenfeld, AB & IEEE 1970, 'Brachyview: An in-body imaging system for real-time QA in HDR prostate brachytherapy', 2013 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC), IEEE Nuclear Science Symposium and Medical Imaging Conference, IEEE, Seoul, South Korea.
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A transrectal real-time source tracking system, BrachyView, is developed by Centre for Medical Radiation Physics at University of Wollongong for treatment quality control during the high dose rate prostate brachytherapy procedure (HDR-PBT). The probe consists of a 15 × 60 mm 2 pixellated silicon detector (four Timepix detectors) encased in a cylindrical seven pinhole tungsten collimator. The source position is determined by back-projecting the source projection images through the collimator pinholes. A prototype BrachyView probe consisting of a single Timepix detector (15 × 15 mm 2 ) and a planar seven pinhole collimator is evaluated in this paper. The source position can be estimated with a maximum error of 0.2 mm on the detector plane, which translates into a maximum error of 1.42 mm within the prostate volume. This result is in good agreement with the results obtained in previously published simulation studies. © 2013 IEEE.
Hasan, MA, Xu, M & He, X 1970, 'A Comprehensive Approach to Automatic Image Browsing for Small Display Devices', The Era of Interactive Media - Pacific-Rim Conference on Multimedia, Pacific-Rim Conference on Multimedia, Springer New York, Sydney, Australia, pp. 267-276.
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© 2013 Springer Science+Business Media, LLC. All rights reserved. Recently, small displays are widely used to browse digital images. While using a small display device, the content of the image appears very small. Users have to use manual zooming and panning in order to see the detail of the image on a small display. Hence, an automatic image browsing solution is desired for user convenience. In this chapter, a novel comprehensive and efficient system is proposed to browse high resolution images using small display devices by automatically panning and zooming on Region-of-Interests (ROIs). The challenge is to provide a better user experience on heterogeneous small display sizes. First of all, an input image is classified into one of the three different classes: close-up, landscape and other. Then the ROIs of image are extracted. Finally, ROIs are browsed based on different intuitive and study based strategies. Our proposed system is evaluated by subjective test. Experimental results indicate that the proposed system is an effective large image displaying technique on small display devices.
Hashmi, RM, Zeb, BA & Esselle, KP 1970, 'Wideband high-gain EBG resonator antenna employing an unprinted composite superstrate', 2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, IEEE, Orlando, FL, pp. 278-279.
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Hashmi, RM, Zeb, BA, Esselle, KP & Hay, SG 1970, 'A simple resonant cavity antenna with improved directivity-bandwidth performance for high-capacity wireless data links', ICECom 2013, 2013 21st International Conference on Applied Electromagnetics and Communications (ICECom), IEEE, Dubrovnik, CROATIA.
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Hashmi, RM, Zeb, BA, Esselle, KP & Hay, SG 1970, 'Effect of truncating the superstructures in broadband Fabry-Pèrot cavity antennas', 2013 SBMO/IEEE MTT-S International Microwave & Optoelectronics Conference (IMOC), 2013 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC), IEEE, Pontif Catholic Univ Rio de Janeiro, Rio de Janeiro, BRAZIL.
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Hassan, MZ, Hossain, MJ, Cheng, J & IEEE 1970, 'Performance of MIMO Adaptive Subcarrier QAM Intensity Modulation in Gamma-Gamma Turbulence', 2013 13TH CANADIAN WORKSHOP ON INFORMATION THEORY (CWIT), 13th Canadian Workshop on Information Theory (CWIT), IEEE, Toronto, CANADA, pp. 195-199.
He, T, Wang, X & Ni, W 1970, 'Optimal chunk-based resource allocation for OFDMA systems with multiple BER requirements', 2013 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2013 - 2013 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), IEEE, Vancouver, CANADA, pp. 4774-4778.
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Hikiyama, Y, Tsutsui, H & Miyanaga, Y 1970, 'MIMO propagation scenario discrimination for adaptive wireless communication systems', 2013 13th International Symposium on Communications and Information Technologies (ISCIT), 2013 13th International Symposium on Communications and Information Technologies (ISCIT), IEEE.
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Hoang, DB & Kamyabpour, N 1970, 'Energy-constrained paths for optimization of energy consumption in Wireless Sensor Networks', 2013 FOURTH INTERNATIONAL CONFERENCE ON NETWORKING AND DISTRIBUTED COMPUTING (ICNDC), International Conference on Networking and Distributed Computing, IEEE, Los Angeles, CA, pp. 9-13.
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A sensor spends a large part of its energy in transmitting its data and relay its neighbours' data. The overall lifetime of a wireless sensor network depends strongly on how a sensor selects its relaying neighbours and the data path to the destination. One critical problem is that if a sensor has to support too many neighbours, its energy is exhausted rapidly and may bring down the whole network. This paper suggests algorithms for assigning weights to links between neighbours taking into account the number of neighbours who rely on them to relay traffic to the destination. In order to do so, the paper also proposes an algorithm for constructing node connectivity based on sensors position within the broadcast range of another sensor, and a shortest energy-constrained path from a sensor to the destination.
Hoang, DB, Phung, MH & Lawrence, E 1970, 'A collaborative task planning and development environment on the Cloud/Grid', 2013 19th IEEE International Conference on Networks (ICON), 2013 19th IEEE International Conference on Networks (ICON), IEEE, Singapore, pp. 1-6.
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A Grid system is a promising solution for sharing distributed resources of registered participants to perform tasks whose demands may exceed the capacity of individual participating organization. However, the collaborative aspect of Grids is still underdeveloped as they lack features and mechanisms for human interaction and collaboration. This paper presents a prototype system for collaborative task planning and workflow development over a Grid implemented as a Rich Internet Application. It allows the participants to design their joint workflow interactively and collaboratively in a high level graphical notation. The resulting workflow can be automatically translated into Business Process Execution Language (BPEL) for testing and execution with a few clicks and forms the basis for further refinement and collaboration. This collaborative workflow design application is part of our larger Active Assistive Cloud/Grid infrastructure. © 2013 IEEE.
Hoang, DB, Phung, MH, Lawrence, E & IEEE 1970, 'A Collaborative Task Planning and Development Environment on the Cloud/Grid', 2013 19TH IEEE INTERNATIONAL CONFERENCE ON NETWORKS (ICON), IEEE International Workshop on Enabling Technologies: Infrastructures for Collaborative Enterprises, The Institute of Electrical and Electronics Engineers, Inc., Larissa, Greece, pp. 266-271.
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Grid system is a promising solution for sharing distributed resources of registered participants to perform tasks whose demands may exceed the capacity of individual participating organization. However, the collaborative aspect of Grids is still underdeveloped as they lack features and mechanisms for human interaction and collaboration. This paper presents the design and development of a prototype integrated environment for collaborative task planning and workflow development over a Grid. It allows the participants to design their joint workplan interactively and collaboratively in a high level graphical notation. The resulting workplan can be translated into Business Process Execution Language (BPEL) for testing and execution in the Grid and forms the basis for further refinement and collaboration. This collaborative Grid environment is a part of our larger Active Assistive Grid infrastructure. © 2010 IEEE.
Hongming Hu, Jianguo Zhu & Youguang Guo 1970, 'An improved direct torque control of permanent magnet synchronous machine', 2013 International Conference on Electrical Machines and Systems (ICEMS), 2013 International Conference on Electrical Machines and Systems (ICEMS), IEEE, Busan, Korea, pp. 1483-1487.
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An improved direct torque control (IDTC) method is studied in the paper for permanent magnet synchronous machine drive. Conventional direct torque control (CDTC) features a high dynamic response with notable drawbacks such as high torque and flux ripples, variable switching frequency along with acoustic noise. To avoid the shortcoming, an improved method is employed to control the combination of flux and torque. Simulation results are presented to validate the effectiveness of the proposed schemes in this paper.
Hongming Hu, Jianguo Zhu & Youguang Guo 1970, 'Model predictive control of permanent magnet synchronous machine with reduced torque ripple', 2013 International Conference on Electrical Machines and Systems (ICEMS), 2013 International Conference on Electrical Machines and Systems (ICEMS), IEEE, Busan, Korea, pp. 1478-1482.
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The conventional direct torque control (DTC) method features fast dynamic response, but it also has notable drawbacks such as high torque and flux ripples, variable switching frequency and acoustic noise. The proposed DTC scheme based on model predictive control (MPC) is studied in the paper for permanent magnet synchronous machine drive. The paper aims to reduce the torque and flux ripple. Firstly one- and two-step delay MPC methods are employed with or without the torque/flux and switching frequency compensation. Furthermore linear extrapolations N-step delay MPC method is taken into account. Compared to simulation results, the two-step delay DTC scheme is better than the one-step scheme in the steady response and dynamic performance, at the same time the torque and frequency compensations can reduce switching frequency from high value to a low constant one. Simulation results are presented to validate the effectiveness of the proposed schemes in this paper
Hossain, MJ, Lu, J, Mahmud, MA, Mithulanthan, N & Pota, HR 1970, 'Dynamic interactions of PV units in low volatge distribution systems', 2013 IEEE 8th Conference on Industrial Electronics and Applications (ICIEA), 2013 IEEE 8th Conference on Industrial Electronics and Applications (ICIEA 2013), IEEE, Swinburne Univ Technol, Melbourne, AUSTRALIA, pp. 495-500.
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Huang, X, Joseph, J, Zhang, JA & Guo, YJ 1970, 'Sample rate conversion with parallel processing for high speed multiband OFDM systems', 2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013 IEEE Wireless Communications and Networking Conference (WCNC), IEEE, Shanghai, China, pp. 2754-2759.
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Based on the sequential sample rate conversion (SRC) structure using B-spline interpolation for orthogonal frequency division multiplexing (OFDM) based software defined radios, a parallel processing SRC structure is proposed in this paper to achieve high speed data transmission for multiband OFDM systems. By deriving an impulse response matrix from the sequential SRC structure, the state vectors of the SRC structure can be calculated from a block of input samples with less complexity than conventional Farrow structure. Real-time SRC implementation combined with local feedback and stuffing is also presented. Performance in terms of state buffer pointer offset caused by clock variation and finite precision in digital hardware is analyzed to provide guidance for practical system design such as determining clock stability and word-length requirements. © 2013 IEEE.
Huy Hoang Nguyen, Tuan Nghia Nguyen, Clout, R, Gibson, A & Nguyen, HT 1970, 'Development of an assistive patient mobile system for hospital environments', 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), IEEE, Osaka, Japan, pp. 2491-2494.
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This paper presents an assistive patient mobile system for hospital environments, which focuses on transferring the patient without nursing help. The system is a combination of an advanced hospital bed and an autonomous navigating robot. This intelligent bed can track the robot and routinely navigates and communicates with the bed. The work centralizes in building a structure, hardware design and robot detection and tracking algorithms by using laser range finder. The assistive patient mobile system has been tested and the real experiments are shown with a high performance of reliability and practicality. The accuracy of the method proposed in this paper is 91% for the targeted testing object with the error rate of classification by 6%. Additionally, a comparison between our method and a related one is also described including the comparison of results.
Inoue, Y, Tsutsui, H & Miyanaga, Y 1970, 'Study of PAPR reduction using coded PTS in 8×8 MIMO-OFDM systems', 2013 International Symposium on Intelligent Signal Processing and Communication Systems, 2013 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), IEEE.
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Iqbal, A, Zhang, W & Lee, JE-Y 1970, 'Enhanced piezoresistive sensing via synchronized oscillations in a mechanically coupled disk array', 2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), 2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), IEEE.
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Iqbal, MS, Esselle, KP & Ge, Y 1970, 'Miniaturization of dielectric resonator antenna for biomedical communication', 2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, IEEE, Orlando, FL, pp. 1904-+.
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Iqbal, MS, Ge, Y & Esselle, KP 1970, 'An antenna with small footprint, small volume and full ground plane for UWB systems', 2013 IEEE International Conference on Ultra-Wideband (ICUWB), 2013 IEEE International Conference on Ultra-Wideband (ICUWB), IEEE, pp. 20-22.
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This paper presents the design of an antenna with small footprint, small volume and full ground plane for ultrawideband (UWB) systems. The design consists of two different dielectric segments, which reside above a ground plane, and is excited by a small metallic patch connected to a coaxial probe. The selected dielectric resonator (DR) bandwidth is enhanced by removing some dielectric and forming an air cavity within the structure. The volume of proposed DRA is also reduced by adding a finite planar conducting wall. A full ground plane is used to ensure that most of the power radiates to upper hemisphere. The proposed DRA with good radiation characteristics offers a simulated bandwidth of 68% between 4.6 and 9.3 GHz with |S11| < -10 dB. © 2013 IEEE.
Irfansyah, AN, Lehmann, T, Jenkins, J & Hamilton, TJ 1970, 'Analysis and design considerations of systematic nonlinearity for sigma-delta current-steering DAC', IEEE 2013 Tencon - Spring, 2013 IEEE TENCON Spring Conference, IEEE, IEEE New S Wales Sect, Sydney, AUSTRALIA, pp. 108-111.
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Irfansyah, AN, Lehmann, T, Jenkins, J & Hamilton, TJ 1970, 'Design strategy for enhanced output impedance current-steering DAC in sigma-delta converters', 2013 IEEE 56th International Midwest Symposium on Circuits and Systems (MWSCAS), 2013 IEEE 56th International Midwest Symposium on Circuits and Systems (MWSCAS), IEEE, pp. 289-292.
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This paper analyses the design trade-off of a high-output impedance current mirror structure used as a current-steering DAC in a sigma-delta modulation DAC with dynamic element matching. The aim is to provide a design strategy with transistor sizing guidelines leading to the achievement of high static linearity and high accuracy given specific accuracy, load resistance, and voltage swing requirement. Challenging factors limiting the circuit static linearity are described and shown. A test chip implemented in 180nm CMOS process has been designed and fabricated, with simulated results showing static linearity of a 16-bit DAC has been achieved. © 2013 IEEE.
Islam, MR, Guo, Y & Zhu, J 1970, 'Multiple-input multiple-output medium frequency-link based medium voltage inverter for direct grid connection of photovoltaic arrays', 2013 International Conference on Electrical Machines and Systems (ICEMS), 2013 International Conference on Electrical Machines and Systems (ICEMS), IEEE, Busan, Korea, pp. 202-207.
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Recent advances in magnetic materials and power semiconductor devices have led to the development of compact and lightweight medium voltage inverter with medium frequency-link, which would be a possible solution to reducing the weight and size of grid-connected photovoltaic (PV) inverter systems. This paper presents the design and analysis of a multiple-input multiple-output medium frequency-link based medium voltage inverters for step-up transformer-less direct grid connection of PV arrays. The multiple-output medium frequency-links generates multiple isolated and balanced dc supplies for all of the H-bridge inverter cells of modular multilevel cascaded (MMC) inverter. To verify the feasibility of the proposed system, a scaled down 1 kV laboratory prototype test platform with 5-level MMC inverter is developed. The design and implementation of the prototyping, test platform, and the experimental results are analyzed and discussed.
Islam, MR, Guo, YG, Zhu, JG, Lu, HY & Jin, JX 1970, 'Medium-frequency-link power conversion for high power density renewable energy systems', 2013 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, 2013 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD), IEEE, Beijing, China, pp. 102-106.
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Recent advances in solid-state semiconductors and magnetic materials have provided the impetus for medium frequency-link based medium voltage power conversion systems, which would be a possible solution to reducing the weight and volume of renewable power generation systems. To verify this new concept, in this paper, a laboratory prototype of 1.26 kVA medium-frequency-link power conversion system is developed for a scaled down 1 kV grid applications. The design and implementation of the prototyping, test platform, and the experimental results are analyzed and discussed. It is expected that the proposed new technology would have a great potential for future renewable and smart grid applications.
Islam, MS, Esselle, KP, Matekovits, L, Bull, D & Pilowsky, PM 1970, 'An implantable Hilbert PIFA antenna for RFID based telemetry', 2013 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2013 International Conference on Electromagnetics in Advanced Applications (ICEAA), IEEE, pp. 790-793.
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In this paper, a Hilbert planar inverted F-antenna (H-PIFA) is presented that has been designed to be functional in the Australian 900MHz ISM band (915-928 MHz). The antenna is intended to be attached to an RFID PCB board which is further implanted under the skin of laboratory rats. The overall dimensions of the antenna including the ground plane are 25×25×7.6 mm 3. Although the bandwidth of the antenna is only ∼3%, the total efficiency is around 60% which is significant for implantable antennas. Return loss, impedance bandwidth and radiation patterns have been investigated and found being useful for a short range (2∼3m) RFID telemetry link. © 2013 IEEE.
Islam, S, Esselle, KP, Bull, D & Pilowsky, PM 1970, 'Making a telemetry system implantable: Challenges and opportunities in antenna design', 2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO), 2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO), IEEE.
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Design of a proximity coupled implantable planar inverted F-antenna (I-PIFA) is presented. It's to be operated in the Australian 900MHz ISM band (915-928MHz). This antenna, integrated to an existing Radio Frequency Identification (RFID) tag, will be implanted under the skin of rats for medical research. The main purpose of this wireless telemetry system is to transmit the extracted physiological signals and indicators from the body of the rat to an external RFID reader connected to a computer. The total volume of the antenna is 9.25mm×8mm×3.2mm and the larger ground plane of the RFID circuit board is utilized to improve the performance of the antenna. A skin-fat-muscle planar tissue model has been developed to represent the immediate environment around the antenna, which has been coated with a bio-compatible material. The simulations have shown that the effect of rat skin and the bio-compatible coating on antenna matching is significant. Yet with the conservative antenna design proposed here that has a nominal 10dB return loss bandwidth of 15%, the antenna remain matched over the entire ISM band even if the dielectric constants of the rat skin and bio-compatible coating change over a wide range. © 2013 IEEE.
Islam, S, Esselle, KP, Bull, D & Pilowsky, PM 1970, 'Making a Telemetry System Implantable: Challenges and Opportunities in Antenna Design', 2013 IEEE MTT-S INTERNATIONAL MICROWAVE WORKSHOP SERIES ON RF AND WIRELESS TECHNOLOGIES FOR BIOMEDICAL AND HEALTHCARE APPLICATIONS (IMWS-BIO), IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-Bio), IEEE, Singapore, SINGAPORE, pp. 328-330.
Islam, S, Esselle, KP, Matekovits, L, Bull, D & Pilowsky, PM 1970, 'An implantable PIFA antenna with a J-shaped proximity feed for RFID telemetry', ICECom 2013, 2013 21st International Conference on Applied Electromagnetics and Communications (ICECom), IEEE.
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A J-shaped proximity coupled Planar Inverted F-Antenna (PIFA), designed to be implanted into rat's body, is presented in this paper. The operating frequency range of the antenna is the Australian ISM (915-928 MHz) band. Antenna's surrounding (rat's body tissue) model has been developed and applied in the simulation to study the antenna radiation patterns, return loss and impedance bandwidth. The proposed multilayer PIFA antenna is compact and its dimensions are 13.5 mm × 11 mm × 4.25 mm including the ground plane. The antenna is designed to be connected with the RF module of a Radio Frequency Identification (RFID) circuit board. The wireless link distance between the implantable RFID device and external base station is approximately 2m. A 5% impedance bandwidth at 10dB return-loss is predicted. © 2013 KoREMA.
Ismail, RMTR & Ha, QP 1970, 'Trajectory tracking and anti-sway control of three-dimensional offshore boom cranes using second-order sliding modes', 2013 IEEE International Conference on Automation Science and Engineering (CASE), 2013 IEEE International Conference on Automation Science and Engineering (CASE 2013), IEEE, Madison, WI, USA, pp. 996-1001.
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Shipping and stevedoring industry is going to witness a massive increase in the amount of containers to be handled while land constraints become more critical. Offshore transfer operations hence offer a preferable solution to deal with the surge in cargos rather than to expand the port outwards. Recently, there has been increasing research interests on offshore crane automation. Suspended cargos in a ship-mounted crane system are caused to swing due to the vibratory motion of the ship induced by ocean waves, which can lead to collision between cargos and deck. Therefore, it is vital for offshore crane systems to satisfy rigorous requirements in terms of safety and efficiency. This paper presents the modelling and control development for offshore boom crane systems. A second-order sliding mode control law is proposed for trajectory tracking and sway suppression control, making use of its capability of actuator chattering alleviation while achieving high tracking performance and preserving strong robustness. The asymptotic stability of the closed-loop system is guaranteed in the Lyapunov sense. Simulation results indicate that the proposed controller can significantly reduce the effect of disturbances coming from gusty waves and other dynamic loadings.
Jafari, M, Malekjamshidi, Z, Li Li & Jian Guo Zhu 1970, 'Performance analysis of full bridge, boost half bridge and half bridge topologies for application in phase shift converters', 2013 International Conference on Electrical Machines and Systems (ICEMS), 2013 International Conference on Electrical Machines and Systems (ICEMS), IEEE, Busan,Korea, pp. 1589-1595.
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In this paper, performances of three topologies of bidirectional ports applicable to phase shift converters are compared. The proposed topologies include full bridge, half bridge and boost-half bridge that are commonly used as bi-directional port in various topologies of DC converters. The proposed analyses based on several indicators and characteristics of the topologies including reliability factor, switching loss, current ripple, cost, size, efficiency, range of power flow versus phase shift angle and control complexity. A phase shift converter based on proposed topologies was simulated using P-SIM. The analysis shows that considering all effective factors, full bridge topology provides better characteristics compared with others and can be selected for a phase shift converter. Also in some applications other topologies still remain a favorite choice. © 2013 IEEE.
Jan, MA, Nanda, P & He, X 1970, 'Energy Evaluation Model for an Improved Centralized Clustering Hierarchical Algorithm in WSN', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), International Conference on Wired / Wireless Internet Communications, Springer Berlin Heidelberg, St. Petersburg, Russia, pp. 154-167.
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Wireless Sensor Networks (WSN) consists of battery-powered sensor nodes which collect data and route the data to the Base Station. Centralized Cluster-based routing protocols efficiently utilize limited energy of the nodes by selecting Cluster Heads (CHs) in each round. Selection of CHs and Cluster formation is performed by the Base Station. In each round, nodes transmit their location information and their residual energy to the Base Station. This operation is a considerable burden on these resource hungry sensor nodes. In this paper we propose a scheme whereby a small number of High-Energy nodes gather location information and residual energy status of the sensing nodes and transmit to the Base Station. This scheme eliminates CH advertisement phase in order to conserve energy. Based on the energy consumption by various types of nodes, we have derived an energy model for our algorithm which depicts the total energy consumption in the network. © 2013 Springer-Verlag.
Jan, MA, Nanda, P, He, X, Liu, RP & IEEE 1970, 'Enhancing Lifetime and Quality of Data in Cluster-based Hierarchical Routing Protocol for Wireless Sensor Network', 2013 IEEE 15TH INTERNATIONAL CONFERENCE ON HIGH PERFORMANCE COMPUTING AND COMMUNICATIONS & 2013 IEEE INTERNATIONAL CONFERENCE ON EMBEDDED AND UBIQUITOUS COMPUTING (HPCC_EUC), IEEE/IFIP International Conference on Embedded and Ubiquitous Computing, IEEE, Zhangjiajie, Hunan Province, P.R. China, pp. 1400-1407.
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Wireless Sensor Network (WSN) performs energy extensive tasks and it is essential to rotate sensor nodes frequently so that Cluster Head selections can be made efficiently. In this paper, we aim to improve the lifetime of sensor network by using LEACH based protocols and efficiently utilizing the limited energy available in these sensor nodes. In sensor network, the amount of data delivered at the base station is not important but it is the quality of the data which is of utmost importance. Our proposed approach significantly improves the life time and quality of data being delivered at the base station in sensor network. We evaluate our proposed approach using different sets of node energy levels and in each case our approach shows significant improvement over existing cluster-based hierarchical routing protocols. We evaluate our scheme in terms of energy consumption, life time and quality of data delivered at the base station. © 2013 IEEE.
Jayawickrama, BA, Dutkiewicz, E, Fang, G, Oppermann, I, Mueck, M & IEEE 1970, 'Downlink Power Allocation Algorithm for Licence-exempt LTE Systems Using Kriging and Compressive Sensing Based Spectrum Cartography', 2013 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM), IEEE Global Telecommunications Conference, IEEE, Atlanta, GA, USA, pp. 3766-3771.
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Licence-exempt secondary Long Term Evolution systems have been proposed recently, in attempt to meet the needs of rapidly growing wireless mobile applications. However, where the secondary network is spread over a large geographical area, traditional detect-and-avoid algorithms are less effective in providing interference protection to Primary Users while maximising the secondary throughput. Spectrum cartography is an emerging technique that can be used to discover spectrum holes in space. We propose a downlink power allocation algorithm using Kriging Spatial Interpolation and Compressive Sensing based spectrum cartography in an environment where large scale shadow fading is prominent. We evaluate the performance of our approach by simulating a secondary Urban Microcell network operating in TV White Space. Simulation results show a significant improvement in interference and throughput, in comparison to traditional detect-and-avoid algorithms. © 2013 IEEE.
Jayawickrama, BA, Dutkiewicz, E, Oppermann, I, Fang, G, Ding, J & IEEE 1970, 'Improved Performance of Spectrum Cartography Based on Compressive Sensing in Cognitive Radio Networks', 2013 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC), IEEE International Conference on Communications, IEEE, Budapest, Hungary, pp. 5657-5661.
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Spectrum cartography is the process of constructing a map showing Radio Frequency signal strength over a finite geographical area. Multiple research groups have recently proposed to use spectrum cartography in the context of discovering spectrum holes in space that can be exploited locally in cognitive radio networks. In our novel approach, we exploit the sparsity of primary users in space to formulate the cartography process as a compressive sensing problem. Further, we present a novel algorithm for solving the cartography problem that builds on the well-known Orthogonal Matching Pursuit algorithm. We evaluate the performance of our approach by simulating a cognitive radio network where primary users are low power wireless microphones. Our simulation results show a significant improvement in reconstruction error, in comparison to two existing compressive sensing based methods. © 2013 IEEE.
Jian Zhang, Tao Yang & Zhuo Chen 1970, 'Concatenated training in distibuted transmit beamforming sysems', 2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013 IEEE Wireless Communications and Networking Conference (WCNC), IEEE, Shanghai, China, pp. 3915-3920.
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Generating and feeding back beamforming vector are very challenging tasks in distributed transmit beamforming (DTB) systems. Phases of DTB nodes may vary rapidly due to residual carrier frequency offset and hence frequent updating of beamforming vector is required. Existing iterative training schemes that only require one bit training and one or two bits feedback in each iteration have low convergence speed and are nor robust in noisy channels due to the lack of structure in the training sequences. In this paper, we consider a DTB system where the number of training bits N sent from each node is no more than the number of source nodes M, and propose a concatenated training scheme based on optimal design of training sequence in this case. For spatially uncorrelated channels, we show that the concatenated training scheme can optimally combine the N latest training signals and achieve beamforming gain approximately proportional to N/M. An algorithm which can adaptively determine the length of the combination in time-varying channels is also proposed. Simulation results demonstrate the proposed scheme can work efficiently even at very low signal-to-noise ratio, with the total feedback bits much less than those required in the iterative schemes. © 2013 IEEE.
Jie Ding, Dutkiewicz, E & Xiaojing Huang 1970, 'Performance evaluation of virtual MIMO for UWB based body area networks', 2013 7th International Symposium on Medical Information and Communication Technology (ISMICT), 2013 7th International Symposium on Medical Information and Communication Technology (ISMICT 2013), IEEE, Tokyo, Japan, pp. 28-32.
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For impulse radio ultra wideband (IR-UWB) based wireless body area network (WBAN) systems, one of the significant challenges is to guarantee a reliable link for data transmission. For this purpose, in this paper, we develop a simple but effective virtual MIMO (VMIMO) based cooperative diversity scheme for a single antenna transmitter being aided by an amplify-and-forward (AF) relay. To the best of our knowledge, this is the first paper where performance of VMIMO is evaluated in IR-UWB based WBAN systems. The theoretical analysis reveals that VMIMO not only offers a full spatial diversity, but also can collect the multipath diversity contained in the dense WBAN channels. Preliminary simulation results show that VMIMO can provide a considerable improvement on bit error rate (BER) performance compared with the single-input single-output (SISO) WBAN systems. © 2013 IEEE.
Jie Ding, Dutkiewicz, E, Xiaojing Huang, Daiming Qu & Tao Jiang 1970, 'Carrier frequency offset estimation for non-contiguous OFDM receiver in cognitive radio systems', 2013 IEEE Global Communications Conference (GLOBECOM), 2013 IEEE Global Communications Conference (GLOBECOM 2013), IEEE, Atlanta, GA, USA, pp. 4192-4197.
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For non-contiguous (NC) OFDM based cognitive radio (CR) systems, schemes have been developed in literature to acquire spectrum synchronization information (SSI) with perfect carrier frequency offset (CFO) synchronization. However, OFDM is extremely sensitive to the CFO in practice, which leads to inter-carrier interference (ICI), hence degrading the spectrum synchronization performance for existing schemes. An accurate CFO estimation is therefore required before setting up the SSI. In this paper, we present a novel scheme based on the maximum likelihood (ML) algorithm to estimate the CFO for the NC-OFDM receiver when the SSI is unknown. A corresponding Cramér-Rao lower bound (CRB) with the ideal SSI is derived to demonstrate the efficiency of the proposed scheme. Simulation results show that the proposed scheme is robust against interference and achieves a satisfactory accuracy of estimation, which is close to the relevant CRB. © 2013 IEEE.
Jin Lai, Dutkiewicz, E, Ren Ping Liu & Vesilo, R 1970, 'Performance optimization of cooperative spectrum sensing in cognitive radio networks', 2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013 IEEE Wireless Communications and Networking Conference (WCNC), IEEE, Shanghai, China, pp. 631-636.
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Cooperative spectrum sensing has been proposed to significantly improve spectrum sensing accuracy by taking advantage of the cooperation among multiple secondary users (SUs). Most of existing work assumes that all SUs have the same SNR values of primary users' signal while the difference of SNR values among SUs, although it is very common in practice, is largely ignored. In this paper, we investigate two cooperative spectrum sensing scenarios where multiple geographically diverse SUs may have different SNR values. In the first scenario a cognitive radio network (CRN) with a single primary channel is considered. We aim to optimize the individual thresholds of SUs to maximize SU throughput subject to the constraint of missed detection probability. In the second scenario where there are multiple channels in a CRN, we jointly optimize the allocation of SUs to sense different channels and the individual detection thresholds of SUs. Our objective is to maximize total SU throughput over multiple channels while guaranteeing the missed detection probability below a given threshold. Simulation results demonstrate that our proposed schemes achieve significant improvements in SU throughput over the existing schemes. © 2013 IEEE.
Jin, JX, Xu, W, Chen, Y, Guo, YG & Zhu, JG 1970, 'Novel Control Platform Development for PMLSM Drive System Based on Virtual Instrument', Applied Mechanics and Materials, Linear Drives for Industry Applications, Trans Tech Publications, Ltd., Hangzhou, China, pp. 530-535.
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A novel control platform for the permanent magnet linear synchronous motor (PMLSM) drive system has been built up based on virtual instrument (VI) and relavant data acquisition card (DAQ) devices. In the traditional control platform, it mostly depends on digital signal processor (DSP), which needs a lot of time to further develop the interface between the personal computer (PC) and operators, and its computational capability is not strong than computer. To overcome these shortages, a novel control platform is presented on the base of one PC, one LabVIEW, and one multifunctional data acquisition card. Firstly, a space vector pulse width modulation (SVPWM) signal source is executed in the VI. Then in order to improve the precision of control system, the field oriented control (FOC) is proposed for the PMLSM. Finally comprehensive experiments verify with relative simulations.
Jing Zhou, Aihuang Guo, Juan Xu, Celler, B & Su, S 1970, 'A reliable medium access mechanism based on priorities for wireless body sensor networks', 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), IEEE, Osaka, Japan, pp. 1855-1858.
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Wireless body sensor networks (WBSN) provide health related information for monitoring or professional analysis by collecting various signals of human body or environment information with sensors. But different data acquired in many applications have different transmission requirements. The dropping of life-critical messages could possibly create life threatening results if the network is not reliable. To improve the reliability this paper proposes a novel reliable medium access mechanism (RMAM) which guarantees transmission of data with different priorities in less delay and energy consumption. The mechanism is designed and evaluated by Castalia. The improved performances of latency, packets breakdown and energy consumption are analyzed and depicted with comparison.
Karadag, Y, Aas, M, Jonáš, A, Anand, S, McGloin, D & Kiraz, A 1970, 'Dye lasing in optically manipulated liquid aerosols', SPIE Proceedings, SPIE NanoScience + Engineering, SPIE, San Diego, CA.
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Karmokar, DK, Esselle, KP, Thalakotuna, DNP, Heimlich, M & Matekovits, L 1970, 'A leaky-wave antenna for beam steering in forward and backward directions', IEEE 2013 Tencon - Spring, 2013 IEEE TENCON Spring Conference, IEEE, Sydney, NSW, Australia, pp. 47-50.
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A half-width microstrip leaky-wave antenna (HW-MLWA) is designed with forward (broadside-endfire) and backward (broadside-backfire) scanning capability. One feed and 50 ω load are connected at each end of the radiating element with a simple feed network and controlled switches that allow the antenna to scan in both forward and backward directions. The main beam is steered at any operating frequency by changing the admittance between the free edge of the radiating element and the ground. This is done by connecting 30 lumped capacitors (1 pF each) to the free edge of the radiating element with a total of 30 switches and vias. The antenna can scan a range of 34° in both forward and backward directions. © 2013 IEEE.
Karmokar, DK, Thalakotuna, DNP, Esselle, KP & Heimlich, M 1970, 'Controlling the beam scanning limits of a microstrip leaky-wave antenna', 2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, IEEE, Orlando, FL, USA, pp. 1330-1331.
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An electronically controlled half-width microstrip leaky-wave antenna (HW-MLWA) that can scan the main beam at a fixed frequency is presented. A technique is described to change the upper and lower limits of the beam direction without changing the scanning range itself. By varying the reactance profile at the free edge, the main beam of the proposed antenna can scan a range of 23° in discrete steps. There are 30 stubs positioned at the free edge of the antenna that gives the freedom to the designer to change the upper and lower scanning limits of the antenna without changing the scanning range itself. © 2013 IEEE.
Karmokar, DK, Thalakotuna, DNP, Esselle, KP, Heimlich, M & Matekovits, L 1970, 'Fixed-frequency beam steering from a stub-loaded microstrip leaky-wave antenna', 2013 International Symposium on Electromagnetic Theory, EMTS 2013 - Proceedings, 2013 International Symposium on Electromagnetic Theory, pp. 436-439.
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A microstrip leaky-wave antenna (MLWA) is designed for fixed-frequency beam steering. The main beam direction of this antenna is controlled by changing the periodic reactive loading of a microstrip line. This reactive loading is provided by a set of periodic patches closely coupled to the stubs in the microstrip line. These patches can be selectively connected to the ground using PIN diodes. The proposed reconfigurable antenna can steer main beam from 40° to 64° in discrete steps at 6.2 GHz. © 2013 IEICE.
Karmokar, DK, Thalakotuna, DNP, Esselle, KP, Matekovits, L & Heimlich, M 1970, 'Reconfigurable half-width microstrip leaky-wave antenna for fixed-frequency beam scanning', 2013 7th European Conference on Antennas and Propagation, EuCAP 2013, European Conference on Antennas and Propagation, IEEE, Gothenburg, Sweden, pp. 1314-1317.
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A new technique to implement fixed-frequency beam scanning using a half-width microstrip leaky-wave antenna (HW-MLWA) is presented. The main beam direction is electronically controlled by changing the reactance between the one edge of a microstrip and the ground. This is achieved through a set of patches periodically placed along the free radiating edge of the microstrip line, with the second edge of the microstrip line is grounded. The patches can be connected to or isolated from the ground using PIN diodes thus facilitating a sub-nanosecond means of controlling the reactance. The full-wave numerical simulations show the ability to control the main beam direction from 21°to 37°at 6.5 GHz within the first quadrant. © 2013 EurAAP.
Kha, HH, Tuan, HD, Nguyen, HH & Tam, HHM 1970, 'Joint design of user power allocation and relay beamforming in two-way MIMO relay networks', 2013, 7th International Conference on Signal Processing and Communication Systems (ICSPCS), 2013 7th International Conference on Signal Processing and Communication Systems (ICSPCS), IEEE, Carrara, VIC, Australia.
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This paper is concerned with the joint optimization of user power allocation and distributed relay beamforming in two-way wireless relay networks in which multiple multi-antenna relays assist multiple single-antenna users. The design aims at maximizing the minimum information rate among user pairs subject to various practical power constraints at the users and relays. Since the nonconvex structure of the problem is highly complicated, the existing approaches to relax the design problem into a convex program do not appear to be applicable. To solve this challenging nonconvex optimization problem, we introduce auxiliary variables and cast the design problem into a d.c.(difference of convex functions) program. Then, we develop an efficient iterative algorithm of sequential convex optimization to obtain the optimized solutions. Extensive simulation results demonstrate that our proposed joint design outperforms the only relay beamforming design. © 2013 IEEE.
Kong, X, Liu, L & Chen, J 1970, 'Modeling Impacts on Software Development Productivity', Advances in Social and Behavioral Sciences - 2013 Asian Conference on the Social Sciences, Asian Conference on the Social Sciences (ACSS), Singapore Management and Sports Science Institute Advances in Social and Behavioral Sciences, Hong Kong, pp. 26-31.
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The mainstream approach to software development productivity has been on identifying factors of impacting on software development productivity and the static relations between the impact factors and performance. This paper presents a dynamic relationship based on economic theory. The findings provide practitioners with insight into how these factors interact and impact on project productivity. Through simulation based on the Analytical Theory of Project Investment, we have demonstrated the dynamic relationship between project duration, the uncertainty level of the perceived project value and the fixed project upfront cost.
Kusakunniran, W, Satoh, S, Jian Zhang & Qiang Wu 1970, 'Attribute-based learning for large scale object classification', 2013 IEEE International Conference on Multimedia and Expo (ICME), 2013 IEEE International Conference on Multimedia and Expo (ICME), IEEE, San Jose, California, USA, pp. 1-6.
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Scalability to large numbers of classes is an important challenge for multi-class classification. It can often be computationally infeasible at test phase when class prediction is performed by using every possible classifier trained for each individual class. This paper proposes an attribute-based learning method to overcome this limitation. First is to define attributes and their associations with object classes automatically and simultaneously. Such associations are learned based on greedy strategy under certain conditions. Second is to learn a classifier for each attribute instead of each class. Then, these trained classifiers are used to predict classes based on their attribute representations. The proposed method also allows trade-off between test-time complexity (which grows linearly with the number of attributes) and accuracy. Experiments based on Animals-with-Attributes and ILSVRC2010 datasets have shown that the performance of our method is promising when compared with the state-of-the-art. © 2013 IEEE.
Kwok, N, Shi, H, Fang, G, Ha, Q & IEEE 1970, 'ADAPTIVE SCALE ADJUSTMENT DESIGN OF UNSHARP MASKING FILTERS FOR IMAGE CONTRAST ENHANCEMENT', PROCEEDINGS OF 2013 INTERNATIONAL CONFERENCE ON MACHINE LEARNING AND CYBERNETICS (ICMLC), VOLS 1-4, International Conference on Machine Learning and Cybernetics, IEEE, Tianjin, China, pp. 884-889.
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The unsharp masking filter (UMF) has been widely used in image processing front ends for contrast enhancement. The filter, being easy to implement, is based on the concept of augmenting a scaled and high-passed version of the image to itself. The UMF performance is critically dependent on the generation of the highpassed signal to be added as well as its associated scale factor. However, the optimal choice of filter parameters still remains a challenging task due to possible intensity clipping problems where the filtered pixel magnitude is vulnerable to be out of the permitted display ranges. In this research, an adaptive scheme is formulated such that the scale is derived from the pixel intensity of the input image. Specifically, pixels in the mid-range intensity will be assigned a larger scaling factor according to a Gaussian-like profile. In addition, the optimal profile coefficients and the width of the high-pass generator window are determined by adopting the particle swarm optimization algorithm. Satisfactory simulation results obtained from a collection of a large set of images have shown the effectiveness of the proposed image contrast enhancement approach.
Laird, I & Lu, DDC 1970, 'Steady state reliability of maximum power point tracking algorithms used with a thermoelectric generator', 2013 IEEE International Symposium on Circuits and Systems (ISCAS2013), 2013 IEEE International Symposium on Circuits and Systems (ISCAS), IEEE, Beijing, China, pp. 1316-1319.
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A thermoelectric generator (TEG) with its near linear V-I characteristic makes its operation distinct from a photovoltaic (PV) cell. However, when maximum power point tracking (MPPT) is implemented in TEG power electronic systems, the established knowledge and wisdom surrounding PV oriented MPPT systems is often applied directly without consideration of the TEG's characteristics. Unsuitable MPPT algorithms generate large operating point variations thus deteriorating the steady state performance of the TEG. Therefore an algorithm that can reliably deliver power with low steady state error over a range of operating conditions is desired. This paper compares three common MPPT methods (perturb and observe, power gradient tracking and fractional open-circuit voltage / short-circuit current), in terms of their steady state performance and reliability, when used with a 4.2 V, 3.4 A (for matched load at ΔT = 270°C) TEG module. Experimental results are reported that confirm better and more reliable steady state performance of the fractional open-circuit voltage / short-circuit current method compared to the perturb and observe and power gradient tracking algorithms. © 2013 IEEE.
Lei Shi, Kodagoda, S & Piccardi, M 1970, 'Towards simultaneous place classification and object detection based on conditional random field with multiple cues', 2013 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2013 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2013), IEEE, Tokyo, Japan, pp. 2806-2811.
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Leijdekkers, P, Gay, V & Wong, F 1970, 'CaptureMyEmotion: a Mobile App to Improve Emotion Learning for Autistic Children Using Sensors', 2013 IEEE 26TH INTERNATIONAL SYMPOSIUM ON COMPUTER-BASED MEDICAL SYSTEMS (CBMS), IEEE International Symposium on Computer Based Medical Systems (CBMS), IEEE Computer Society, Porto, Portugal, pp. 381-384.
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Autism Spectrum Disorder (ASD) is estimated to affect one in eighty-eight children and many mobile apps are available from Google Play or Apple store to help these children and their carer. Our research into apps for autistic children identified that none of the apps use the full potential offered by mobile technology and sensors to overcome one of autisticc children's main difficulty: the identification and expression of emotions. This paper describes a mobile apps called CaptureMyEmotion that enables autistic childrens to take photo, videos or sounds, and at the same time senses their arousal level using a wireless sensor. It also allows the child to comment on their emotion at the time of capture. The app has the potential to help autistic children improve their emotions lerating based on their own pictures, videos or sounds. It gives the carer a means to discuss the identification and expressionn of emotions.
Lezana, P, Norambuena, M, Aguilera, RP & Quevedo, DE 1970, 'Dual-stage model predictive control for Flying Capacitor Converters', IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, IEEE, Vienna, Austria, pp. 5794-5799.
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In this work, we propose a dual-stage control approach for a three-phase four-level Flying Capacitor Converter. The key idea of this proposal is to combine two control strategies to govern this converter. Thus, if the system state (output currents and floating voltages) is far from the desired reference, Finite-Control-Set Model Predictive Control is used to quickly lead the system towards the reference. Once the system state reaches a neighborhood of the reference, the propose control strategy switches to a PWM-based linear controller to finally achieve the desired reference in a gentle manner. © 2013 IEEE.
Li, K, Safavi-Naeini, M, Franklin, DR, Petasecca, M, Guatelli, S, Rosenfeld, AB, Hutton, BF, Lerch, MLF & IEEE 1970, 'Design and Development of PETiPIX: An Ultra High Spatial Resolution Small Animal PET Scanner', 2013 IEEE NUCLEAR SCIENCE SYMPOSIUM AND MEDICAL IMAGING CONFERENCE (NSS/MIC), IEEE Nuclear Science Symposium and Medical Imaging Conference, IEEE, Seoul, South Korea.
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PETiPIX is an ultra high spatial resolution small animal PET scanner designed for scanning of mouse brains. It utilises four state of the art pixellated silicon detectors, Timepix, in an edge-on configuration to provide a field of view (FoV) 15 mm in diameter. Each Timepix detector consists of 256×256 pixels, with pixel dimensions of 55μm×55μm× 300μm. Monte Carlo simulations have been carried to evaluate the performance of the proposed scanner. The simulated scanner achieved an overall spatial resolution of 0.29 mm (measuring at full width at half maximum (FWHM)) with a sensitivity of 0.01%. Two separate phantom studies (hot phantom and cold Jaszczk phantom) have been performed and their results demonstrate that PETiPIX is capable of achieving a high spatial resolution across its full FoV. Preliminary experiments recording recoil electrons tracks from Compton scattering events agree with the simulation results. Experiments involving two synchronised Timepix modules with a 68 Ga point source placed in the centre of the FoV demonstrated the capability of PETiPIX prototype to record true coincidence events. © 2013 IEEE.
Li, Y, Shen, C, Jia, W & van den Hengel, A 1970, 'Leveraging surrounding context for scene text detection', 2013 IEEE International Conference on Image Processing, 2013 20th IEEE International Conference on Image Processing (ICIP), IEEE, Melbourne, Australia, pp. 2264-2268.
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Finding text in natural images has been a challenging task in vision. At the core of state-of-the-art scene text detection algorithms are a set of text-specific features within extracted regions. In this paper, we attempt to solve this problem from a different prospective. We show that characters and non-character interferences are separable by leveraging the surrounding context. Surrounding context, in our work, is composed of two components which are computed in an information-theoretic fashion. Minimization of an energy cost function yields a binary label for each region, which indicates the category it belongs to. The proposed algorithm is fast, discriminative and tolerant to character variations and involves minimal parameter tuning. © 2013 IEEE.
Li, YJ, Yang, QX, Wang, YH, Zhu, JG & Lin, ZW 1970, 'Rotational core loss features of soft magnetic composite materials under excitation frequencies from 5 Hz to 1000 Hz', 2013 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, 2013 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD), IEEE, Beijing, China, pp. 450-453.
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In this paper, core loss features of soft magnetic composite (SMC) material from 5 Hz to 1000 Hz have been properly measured and discussed under alternating and three dimensional (3-D) rotational magnetizations. The comparison results show that the rotational core losses are greater than that of the alternating core losses at the same magnitude of magnetic induction densities, especially at relatively higher excitation frequencies. The corresponding rotational hysteresis properties, such as magnetic flux density vector loci, magnetic field strength vector loci are also measured and analyzed. Experimental results show that SMC materials have good 3-D features, and great potential for application in rotational magnetic flux machines.
Ling, L, Cheng, E, Burnett, IS & IEEE 1970, 'AN ITERATED EXTENDED KALMAN FILTER FOR 3D MAPPING VIA KINECT CAMERA', 2013 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP), IEEE International Conference on Acoustics, Speech and Signal Processing, IEEE, Vancouver, BC, Canada, pp. 1773-1777.
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This paper proposes the use of the Iterated Extended Kalman Filter (IEKF) in a real-time 3D mapping framework applied to Microsoft Kinect RGB-D data. Standard EKF techniques typically used for 3D mapping are susceptible to errors introduced during the state prediction linearization and measurement prediction. When models are highly nonlinear due to measurement errors e.g., outliers, occlusions and feature initialization errors, the errors propagate and directly result in divergence and estimation inconsistencies. To prevent linearized error propagation, this paper proposes repetitive linearization of the nonlinear measurement model to provide a running estimate of camera motion. The effects of iterated-EKF are experimentally simulated with synthetic map and landmark data on a range and bearing camera model. It was shown that the IEKF measurement update outperforms the EKF update when the state causes nonlinearities in the measurement function. In the real indoor environment 3D mapping experiment, more robust convergence behavior for the IEKF was demonstrated, whilst the EKF updates failed to converge. © 2013 IEEE.
Liu, H, Xu, D, Huang, Q, Li, W, Xu, M & Lin, S 1970, 'Semantically-Based Human Scanpath Estimation with HMMs', 2013 IEEE International Conference on Computer Vision, 2013 IEEE International Conference on Computer Vision (ICCV), IEEE, Sydney, Australia, pp. 3232-3239.
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We present a method for estimating human scan paths, which are sequences of gaze shifts that follow visual attention over an image. In this work, scan paths are modeled based on three principal factors that influence human attention, namely low-level feature saliency, spatial position, and semantic content. Low-level feature saliency is formulated as transition probabilities between different image regions based on feature differences. The effect of spatial position on gaze shifts is modeled as a Levy flight with the shifts following a 2D Cauchy distribution. To account for semantic content, we propose to use a Hidden Markov Model (HMM) with a Bag-of-Visual-Words descriptor of image regions. An HMM is well-suited for this purpose in that 1) the hidden states, obtained by unsupervised learning, can represent latent semantic concepts, 2) the prior distribution of the hidden states describes visual attraction to the semantic concepts, and 3) the transition probabilities represent human gaze shift patterns. The proposed method is applied to task-driven viewing processes. Experiments and analysis performed on human eye gaze data verify the effectiveness of this method. © 2013 IEEE.
Mao, R, Wu, Q, Qiao, Y, Bai, L & Yang, J 1970, 'Multi-view urban scene reconstruction in non-uniform volume', SPIE Proceedings, Sixth International Conference on Machine Vision (ICMV 13), SPIE, London, United Kingdom.
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This paper presents a new fully automatic approach for multi-view urban scene reconstruction. Our algorithm is based on the Manhattan-World assumption, which can provide compact models while preserving fidelity of synthetic architectures. Starting from a dense point cloud, we extract its main axes by global optimization, and construct a nonuniform volume based on them. A graph model is created from volume facets rather than voxels. Appropriate edge weights are defined to ensure the validity and quality of the surface reconstruction. Compared with the common pointcloud- to-model methods, the proposed methodology exploits image information to unveil the real structures of holes in the point cloud. Experiments demonstrate the encouraging performance of the algorithm. © 2013 SPIE.
Matsuura, M, Tsutsui, H & Miyanaga, Y 1970, 'Realtime transmission of full high-definition 30 frames/s videos over 8×8 MIMO-OFDM channels using HACP-based lossless coding', 2013 13th International Symposium on Communications and Information Technologies (ISCIT), 2013 13th International Symposium on Communications and Information Technologies (ISCIT), IEEE.
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Metia, S, Oduro, SD, Ha, QP & Duc, H 1970, 'Environmental Time Series Analysis and Estimation with Extended Kalman Filtering', 2013 FIRST INTERNATIONAL CONFERENCE ON ARTIFICIAL INTELLIGENCE, MODELLING AND SIMULATION (AIMS 2013), International Conference on Artificial Intelligence, Modelling and Simulation, IEEE, Kota Kinabalu, Sabah, Malaysia, pp. 235-240.
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© 2013 IEEE. This paper addresses the problem of air pollutant profile estimation by using measurements collected from different weather stations. An algorithm is developed, based on an Extended Kalman Filter to handle missing temporal data and using the statistical Kriging method to interpolate spatial data. Combination of extended Kalman filtering with Matérn covariance function has proven to be useful in exploiting meteorological information to build reliable air quality models. We have applied the developed algorithm to estimate air pollutant profiles in the Sydney basin, which is subject to a variety of pollutant sources, including fossil-fueled electric power generation plants, high motor vehicle usage, aviation and shipping traffic. The results have shown that the proposed approach can improve accuracy of the estimation profiles.
Miyanaga, Y, Takahashi, W & Xihao, S 1970, 'Robust speech communication and its embedded smart robot system', 2013 20th International Conference on Systems, Signals and Image Processing (IWSSIP), 2013 International Conference on Systems, Signals and Image Processing (IWSSIP), IEEE.
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Morinaga, K, Tsutsui, H & Miyanaga, Y 1970, 'An evaluation of wireless video transmission using lossless video compression and 8×8 MIMO-OFDM wireless transceiver', 2013 13th International Symposium on Communications and Information Technologies (ISCIT), 2013 13th International Symposium on Communications and Information Technologies (ISCIT), IEEE.
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Movassaghi, S, Abolhasan, M & Smith, D 1970, 'Interference Mitigation in WBANS: Challenges and Existing Solutions', Workshop on Advances in Real-time Information Networks, Samaneh Movassaghi, University of Technology, Sydney, Australia, pp. 1-4.
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Wireless Body Area Networks (WBANs) are an exciting new networking technology developed in the recent years with advancements in wireless communication, integrated circuits and Micro-Electro- Mechanical Systems (MEMs). They consist of a number of sensor nodes that are placed in or around the human body. However, their practical deployment requires addressing numerous challenges. WBANs face many stringent requirements in power, bandwidth, and network lifetime which need to be taken into serious consideration in the design of different protocols. In this paper, we investigate the importance of interference mitigation amongst coexisting Wireless Body Area Networks (WBANs). Since, a WBAN is most likely to encounter other WBANs, inter-WBAN interference and scheduling is of utmost importance.
Movassaghi, S, Shirvanimoghaddam, M, Abolhasan, M & IEEE 1970, 'A Cooperative Network Coding Approach to Reliable Wireless Body Area Networks with Demodulate-and-Forward', 2013 9TH INTERNATIONAL WIRELESS COMMUNICATIONS AND MOBILE COMPUTING CONFERENCE (IWCMC), International Wireless Communications and Mobile Computing Conference, IEEE, Italy, pp. 394-399.
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In this paper, a novel cooperative transmission scheme via network coding has been proposed for Wireless Body Area Networks (WBANs) to enhance reliability and throughput. In the proposed scheme, namely Random XOR Network Coding (RXNC), each relay demodulates the received signal from each sensor node and then selects d different coded symbols amongst them and XORs them to generate a network coded symbol. We have found the optimum value of d through an analytical approach by minimizing the probability that an XOR network coded symbol is incorrectly generated. Simulation results show that the proposed RXNC scheme outperforms the no-cooperation and conventional bitwise network coding schemes in all channel signal to noise ratios (SNRs) from 0 dB to 18 dB.
Movassaghi, S, Shirvanimoghaddam, M, Abolhasan, M & Smith, D 1970, 'An energy efficient network coding approach for Wireless Body Area Networks', 38th Annual IEEE Conference on Local Computer Networks, 38th Annual IEEE Conference on Local Computer Networks (LCN 2013), IEEE, Sydney, NSW, Australia, pp. 468-475.
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In this paper, we propose a practical network coding approach for wireless body are networks (WBANs) using decode-and-forward relays. In this scheme, namely decode and forward-network coding (DF-NC), each relay linearly combines different messages from different sources to generate one message, and then transmits that message to the destination. Each relay node in DF-NC requires only one transmission time slot to forward its message. Thus, in this approach, energy usage at each relay is minimized compared to existing cooperative schemes without network coding, which require Ns time slots per relay for relay transmissions; where Ns is the number of source nodes. Simulation results show that the proposed DF-NC scheme can achieve near optimal outage probability while minimizing the number of transmissions per node, maximizing the energy efficiency of WBANs, and minimizing the delay
Mukunthan, A, Cooper, C, Safaei, F, Franklin, D, Abolhasan, M, Ros, M & IEEE 1970, 'Experimental Validation of the CORNER Urban Propagation Model based on Signal Power Measurements in a Vehicular Environment', 2013 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC), IEEE Wireless Communications and Networking Conference, IEEE, Shanghai, China, pp. 2626-2631.
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CORNER is an urban propagation model which simulates the presence of buildings in city scenarios and models radio propagation as a series of reflections and diffractions around buildings. CORNER was validated in the original publication with a series of packet-delivery-ratio measurements. However, the accuracy of these measurements is limited by interference from nearby networks. This paper independently evaluates the CORNER model using signal strength measurements across three separate sites in Sydney and Wollongong. The measurements are analysed and compared with the predicted analytical estimates. The fading model is also analysed with direct measurements. A new CORNER link classification algorithm is also proposed in this paper
Navarro, KF, Gay, V, Golliard, L, Johnston, B, Leijdekkers, P, Vaughan, E, Wang, X & Williams, M-A 1970, 'SocialCycle What Can a Mobile App Do To Encourage Cycling?', PROCEEDINGS OF THE 2013 38TH ANNUAL IEEE CONFERENCE ON LOCAL COMPUTER NETWORKS WORKSHOPS (LCN WORKSHOPS), IEEE Conference on Local Computer Networks, IEEE Computer Society, Sydney Australia, pp. 24-30.
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Traffic congestion presents significant environmental, social and economic costs. Encouraging people to cycle and use other forms of alternate transportation is one important aspect of addressing these problems. However, many city councils face significant difficulties in educating citizens and encouraging them to form new habits around these alternate forms of transport. Mobile devices present a great opportunity to effect such positive behavior change. In this paper we discuss the results of a survey aimed at understanding how mobile devices can be used to encourage cycling and/or improve the cycling experience. We use the results of the survey to design and develop a mobile app called SocialCycle, which purpose is to encourage users to start cycling and to increase the number of trips that existing riders take by bicycle. © 2013 IEEE.
Nguyen, AV, Nguyen, LB, Su, S & Nguyen, HT 1970, 'Shared control strategies for human - Machine interface in an intelligent wheelchair', 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), IEEE, Osaka, Japan, pp. 3638-3641.
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In this paper, we introduce a shared control mechanism for an intelligent wheelchair designed to support people with mobility impairments, who also have visual, upper limb, or cognitive impairment. The method is designed to allow users to be involved in the movement as much as possible, while still providing the assistance needed to achieve the goal safely. The data collected through URG-04LX and user interface are analyzed to determine whether the desired action is safe to perform. The system then decides to provide assistance or to allow the user input to control the wheelchair. The experiment results indicate that the method performs effectively with high satisfaction.
Nguyen, AV, Nguyen, LB, Su, S & Nguyen, HT 1970, 'The advancement of an obstacle avoidance bayesian neural network for an intelligent wheelchair', 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), IEEE, Osaka, Japan, pp. 3642-3645.
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In this paper, an advanced obstacle avoidance system is developed for an intelligent wheelchair designed to support people with mobility impairments who also have visual, upper limb, or cognitive impairment. To avoid obstacles, immediate environment information is continuously updated with range data sampled by an on-board laser range finder URG-04LX. Then, the data is transformed to find the relevant information to the navigating process before being presented to a trained obstacle avoidance neural network which is optimized under the supervision of a Bayesian framework to find its structure and weight values. The experiment results showed that this method allows the wheelchair to avoid collisions while simultaneously navigating through an unknown environment in real-time. More importantly, this new approach significantly enhances the performance of the system to pass narrow openings such as door passing.
Nguyen, JS, Su, SW, Nguyen, HT & IEEE 1970, 'Experimental Study on a Smart Wheelchair System Using a Combination of Stereoscopic and Spherical Vision', 2013 35TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), International Conference of the IEEE Engineering in Medicine and Biology Society, IEEE, Osaka, Japan, pp. 4597-4600.
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This paper is concerned with the experimental study performance of a smart wheelchair system named TIM (Thought-controlled Intelligent Machine), which uses a unique camera configuration for vision. Included in this configuration are stereoscopic cameras for 3-Dimensional (3D) depth perception and mapping ahead of the wheelchair, and a spherical camera system for 360-degrees of monocular vision. The camera combination provides obstacle detection and mapping in unknown environments during real-time autonomous navigation of the wheelchair. With the integration of hands-free wheelchair control technology, designed as control methods for people with severe physical disability, the smart wheelchair system can assist the user with automated guidance during navigation. An experimental study on this system was conducted with a total of 10 participants, consisting of 8 able-bodied subjects and 2 tetraplegic (C-6 to C-7) subjects. The hands-free control technologies utilized for this testing were a head-movement controller (HMC) and a brain-computer interface (BCI). The results showed the assistance of TIM's automated guidance system had a statistically significant reduction effect (p-value = 0.000533) on the completion times of the obstacle course presented in the experimental study, as compared to the test runs conducted without the assistance of TIM. © 2013 IEEE.
Nguyen, L, Su, S & Nguyen, HT 1970, 'Effects of hyperglycemia on variability of RR, QT and corrected QT intervals in Type 1 diabetic patients', 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), IEEE, Osaka, Japan, pp. 1819-1822.
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In this study, we evaluated the effects of hyperglycemia on the variability of RR (HRV), QT interval variability (QTV) and corrected QT interval variability (QTcV) during hyperglycemic and non-hyperglycemic conditions in six Type 1 diabetic patients at nights. The aim of this study was to investigate the association of high blood glucose levels with autonomic modulation of heart rate and variation in ventricular repolarization. Blood glucose level (BGL) threshold for defining hyperglycemia state was set at 8.33 mmol/l. Variability of RR, QT and corrected QT intervals during hyperglycemic and non-hyperglycemic were quantified using time and frequency domain measures. Hypomon® device was used to monitor ECG signals and acquire RR and QT intervals in Type 1 diabetic patients overnight. The results indicated that time and frequency domain HRV variables were significantly decreased under hyperglycemic condition and inversely correlated with BGL. QTV parameters also reduced when BGL increased and time domain measures of QTV were inversely associated with BGL. Variability in QTc interval was much less than in the QT interval and demonstrated a lower SDNN and LF power. We concluded that certain components of HRV, time-domain measures of QTV and QTc but not QTcV are strongly correlated to high blood glucose levels and can be good markers to identify hyperglycemic events in T1DM.
Nguyen, LB, Nguyen, AV, Ling, SH, Nguyen, HT & IEEE 1970, 'Combining Genetic Algorithm and Levenberg-Marquardt Algorithm in Training Neural Network for Hypoglycemia Detection using EEG Signals', 2013 35TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), International Conference of the IEEE Engineering in Medicine and Biology Society, IEEE, Osaka, Japan, pp. 5386-5389.
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Hypoglycemia is the most common but highly feared complication induced by the intensive insulin therapy in patients with type 1 diabetes mellitus (T1DM). Nocturnal hypoglycemia is dangerous because sleep obscures early symptoms and potentially leads to severe episodes which can cause seizure, coma, or even death. It is shown that the hypoglycemia onset induces early changes in electroencephalography (EEG) signals which can be detected non-invasively. In our research, EEG signals from five T1DM patients during an overnight clamp study were measured and analyzed. By applying a method of feature extraction using Fast Fourier Transform (FFT) and classification using neural networks, we establish that hypoglycemia can be detected efficiently using EEG signals from only two channels. This paper demonstrates that by implementing a training process of combining genetic algorithm and Levenberg-Marquardt algorithm, the classification results are improved markedly up to 75% sensitivity and 60% specificity on a separate testing set.
Nicholson, A, Jenkins, J, Irfansyah, AN, Politi, N, van Schaik, A, Hamilton, TJ & Lehmann, T 1970, 'A 0.3mm<sup>2</sup> 10-b 100MS/s pipelined ADC using Nauta structure op-amps in 180nm CMOS', 2013 IEEE International Symposium on Circuits and Systems (ISCAS2013), 2013 IEEE International Symposium on Circuits and Systems (ISCAS), IEEE, pp. 1833-1836.
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We present a standard pipelined ADC design using Nauta structure differential op-amps as an alternative to traditional analog op-amps. The six stage pipelined ADC is capable of running at 100MS/s and achieves 8 bit resolution under simulations. The research is focused on the path to scaling to deep sub-micron CMOS and finding alternatives to the reduced gain and low output voltage swing of traditional analog op-amp designs. The Nauta structure op-amp allows us to produce one of the smallest reported areas for a 180nm pipelined ADC occupying only 0.3mm2 for a 10 bit 100MS/s pipelined ADC. © 2013 IEEE.
Nuwanpriya, A, Zhang, J, Grant, A, Ho, S-W & Luo, L 1970, 'Single carrier frequency domain equalization based on on-off-keying for optical wireless communications', 2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013 IEEE Wireless Communications and Networking Conference (WCNC), IEEE, Shanghai, China, pp. 4272-4277.
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Single carrier systems with frequency domain equalization (SC-FDE) have been recently proposed for optical wireless systems as alternatives to optical orthogonal frequency division multiplexing (OFDM) to reduce the peak-to-average power ratio (PAPR) of the transmitted signal and improve the system performance. However, these SC-FDE systems have either higher complexity or lower spectrum efficiency. In this paper a low complexity SC-FDE system based on on-off-keying (OOK) modulation is proposed. Theoretical bit-error-rate (BER) analysis is provided based on minimum mean square error (MMSE) equalization for the proposed system and typical optical SCFDE and OFDM systems. Both analytical and numerical results show that the proposed system significantly outperforms existing SC-FDE and OFDM systems in terms of PAPR, BER and implementation complexity. © 2013 IEEE.
Oduro, SD, Metia, S, Duc, H, Ha, QP & IEEE 1970, 'CO2 Vehicular Emission Statistical Analysis with Instantaneous Speed and Acceleration as Predictor Variables', 2013 INTERNATIONAL CONFERENCE ON CONTROL, AUTOMATION AND INFORMATION SCIENCES (ICCAIS), International Conference on Control, Automation and Information Sciences, IEEE, Nha Trang, Vietnam, pp. 158-163.
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Models for predicting vehicular emissions of carbon dioxide (CO 2) are usually insensitive to vehicle modes of operation (such as cruise, acceleration, deceleration, and idling) as they are based on the average speed of motor vehicles. In the present study, real world on-road second-by-second data are used to improve the accuracy of air quality models by considering modal emissions of CO2 in terms of vehicles' instantaneous speed and acceleration. A regression analysis approach is used with speed and acceleration as the predictor variables while CO2 emission factor as the outcome variable for vehicles manufactured in 2002 and 2008. The results show that there is significantly a linear relationship between CO2, speed and acceleration/deceleration in which speed, as compared to acceleration, has a stronger correlation with respect to the CO2 emission factor. Also, for 2002 and 2008 vehicles, every 1m/s increase in speed will emit respectively 0.041g/s and 0.034g/s CO2, whereas an increase in acceleration by 1m/s2 will produce 0.025g/s and 0.008g/s of CO2 emission in the case of constant predictors. While speed and acceleration are all significant predictors of CO2 emission, it is concluded from the magnitude of the t-statistics that speed has a greater impact than acceleration in predicting CO2 emission. © 2013 IEEE.
Orchi, TF, Hossain, MJ, Pota, HR & Rahman, MS 1970, 'Impact of distributed generation and series compensation on distribution network', 2013 IEEE 8th Conference on Industrial Electronics and Applications (ICIEA), 2013 IEEE 8th Conference on Industrial Electronics and Applications (ICIEA 2013), IEEE, Swinburne Univ Technol, Melbourne, AUSTRALIA, pp. 854-859.
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Orchi, TF, Hossain, MJ, Pota, HR & Rahman, MS 1970, 'Voltage stability and power quality issues of wind farm with series compensation', 2013 IEEE Electrical Power & Energy Conference, 2013 IEEE Electrical Power & Energy Conference (EPEC), IEEE.
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This paper analyzes the impact of using a series capacitor (SC) on voltage stability issues caused by the high penetration of wind energy in a transmission network. Voltage stability during normal operation, voltage sag characteristics, and low voltage ride through (LVRT) capability, harmonics and flickers produced by fixed-speed wind turbine (FSWT) and doubly-fed induction generator (DFIG) wind farms with series and shunt compensation are analyzed. The voltage source converter of a static synchronous compensator (STATCOM), the converter side of a DFIG and a load are considered as harmonics generating sources and are modeled according to IEC standard 61000. The induction machines of the wind farm are modeled with flicker coefficients as defined by IEC standard 61400 and voltage sag analysis is carried out using failure data. Nonlinear modeling and dynamic simulations are carried out in DlgSILENT PowerFactory environment. From the simulation results, it is found that using a SC with wind farm can enhance the system's stability and power quality. © 2013 IEEE.
Peng Cheng, Zhuo Chen, Guo, YJ & Lin Gui 1970, 'Distributed Bayesian compressive sensing based blind carrier-frequency offset estimation for interleaved OFDMA uplink', 2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013 IEEE 24th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), IEEE, London, UK, pp. 801-806.
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Carrier-frequency offset (CFO) estimation for orthogonal frequency-division multiplexing access (OFDMA) systems operating in multiuser uplink transmission is very challenging due to the presence of a multiple-parameter estimation problem. In this paper, we propose a novel blind CFO estimation method for interleaved OFDMA uplink based on distributed Bayesian compressive sensing (DBCS) theory. Considering the received signal structure, the new method first constructs a measurement matrix associated with a sparse signal matrix weight, which sets up the stage for the application of CS theory in tackling the original estimation problem. Then, the DBCS theory that exploits a common sparse profile of the sparse signal matrix weight is employed to distributively estimate a sparse hyperparameter vector, whose significant peaks are linked to the correct estimation of the multiple CFOs. Compared with the existing subspace theory based methods, the proposed scheme offers a significant enhancement in estimation accuracy, in specific in the low signal-to-noise ratio (SNR) region. The numerical results validate the effectiveness of the proposed scheme. © 2013 IEEE.
Peng, Y, Jin, JS, Luo, S, Xu, M, Au, S, Zhang, Z & Cui, Y 1970, 'Vehicle Type Classification Using Data Mining Techniques', The Era of Interactive Media, Pacific-Rim Conference on Multimedia, Springer New York, Sydney, Australia, pp. 325-335.
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© 2013 Springer Science+Business Media, LLC. All rights reserved. In this paper, we proposed a novel and accurate visual-based vehicle type classification system. The system builts up a classifier through applying Support Vector Machine with various features of vehicle image. We made three contributions here: first, we originally incorporated color of license plate in the classification system. Moreover, the vehicle front was measured accurately based on license plate localization and background-subtraction technique. Finally, type probabilities for every vehicle image were derived from eigenvectors rather than deciding vehicle type directly. Instead of calculating eigenvectors from the whole body images of vehicle in existing methods, our eigenvectors are calculated from vehicle front images. These improvements make our system more applicable and accurate. The experiments demonstrated our system performed well with very promising classification rate under different weather or lighting conditions.
Pham, DH, Hunter, G, Li Li & Jianguo Zhu 1970, 'Feedforward decoupling control method in grid-interfaced inverter', 2013 Australasian Universities Power Engineering Conference (AUPEC), 2013 Australasian Universities Power Engineering Conference (AUPEC), IEEE, Hobart Australia, pp. 1-5.
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Recently, microgrid has been studied and applied widely all over the world. More and more experimental microgrids are being connected to the utility grid. This paper presents an improvement in the real and reactive power control of three-phase grid-interfaced inverter for microgrid applications. Based on the traditional PI feedback current control, the desirable values of P and Q can be achieved by controlling the currents in d-q stationary frame. Moreover, the feedforward control method also brings some advantages to the systems such as higher reliability and enhanced stability. One of the most important improvements is to decouple the real and reactive power, i.e. P and Q are controlled separately. In this paper, the controller with feedforward algorithm has been simulated and shows some promiscuous results. © 2013 Australasian Committee for Power Engineering (ACPE).
Pradhan, S & Gay, VC 1970, 'Towards a New Trust Model for Health Social Networks', The 8th International Conference on Internet and Web Application adn Services, International Conference on Internet and Web Applications and Services, IARIA, Rome, Italy, pp. 52-57.
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More specifid purpose driven social networking sites have emerged since social networking sites have gained popularity by bringing people with shared interests together to interact. In health care, they are referred as Health Social Networks (HSNs). Given the sensitive nature of health information, trust ist he fundamental for them. The emergence of pervasive and ubiquitous computing environment and overwhelming information available online is helping the health social sites gain popularityat a fast pace. Health social networkers aare willing to create, share or retrieve trustworthy health or lifestyle related information. Therefore, it is essential that trust is stipulated and scrutinised to understand how the users perceive healthcare, how they decide to interact with HSNs. This paper analyses external factors such as perceived information quality, perceived system quality, perceived reputation and perceived trust signs which impact the trust model for HSNs. In particular, 'perceived reputation' based on the factor 'who has recommended the site' is given an emphasis on this paper. It hightlights that popularity of social networking sites is changing the way trust models have been devined in the past. This is because social relationship created via social networking sites are also impacting on choosing the HSNs and how users are sharing health information on these platforms
Pradhan, S, Gay, V & Nepal, S 1970, 'Social networking and dental care: State of the art and analysis of the impact on dentists, dental practices and their patients', 26th Bled eConference - eInnovations: Challenges and Impacts for Individuals, Organizations and Society, Proceedings, Bled eConference, University of Maribor, Bled, Slovenia, pp. 178-189.
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Health Social networking sites offering search, reviews and recommendation are gaining popularity. This paper reviews the most popular social networking sites related to dental care. Social networks such as DrOogle and Yelp enable their users to review and rate their dentists and dental practices. Such information is then used to rank and recommend dentists or dental practices to new users/patients. This paper compares the dental care social networking sites in terms of their features and criteria supported for search, reviews and recommendations of dentists or dental practices. Mismatches between features and criteria among different dental care reviews sites are identified, which may cause inconsistency in the recommendations in the dental care. Therefore, this paper proposes a new framework for dynamic dental care recommendation system which takes both local (personalised) and global (crowdsourced) trust into account. It analyses the impact of current social networks on dentists, dental practices and their patients. Finally, it identifies the open issues and challenges that need to be addressed to design a trustworthy recommendation system for both the dental professionals and their patients.
Qin, P-Y, Guo, YJ, Ding, C & Soc, IEEEAP 1970, 'A Microstrip Dual-band Polarization Reconfigurable Antenna', 2013 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM (APSURSI), IEEE Antennas-and-Propagation-Society International Symposium (APSURSI), IEEE, Orlando, FL, USA, pp. 1640-1641.
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A new microstrip dual-band polarization reconfigurable antenna is presented for WLANs operating at 2.4 GHz and 5.8 GHz The antenna consists of a square microstrip patch that is aperture coupled to a microstrip line located along the diagonal line of the patch. The dual-band operation is realized by employing the TM10 and TM30 modes of the patch antenna. Four shorting posts are inserted into the patch to adjust the frequency ratio of the two modes. The center of each edge of the patch is connected to ground via a PIN diode for polarization switching. By switching between the different states of PIN diodes, the proposed antenna can have horizontal, vertical, or 45° linear polarizations for the two frequency bands. © 2013 IEEE.
Qu, Z, Wang, J, Xu, M & Lu, H 1970, 'Fusing Warping, Cropping, and Scaling for Optimal Image Thumbnail Generation', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Asian Conference on Computer Vision, Springer Berlin Heidelberg, Singapore, Singapore, pp. 445-456.
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Image retargeting, as a content aware technique, is regarded as a logical tool for generating image thumbnails. However, the enormous difference between the size of source and target usually hinders single retargeting method from obtaining satisfactory results. In this paper, an unified framework is proposed to fuse three popular retargeting strategies, i.e. warping, cropping, and scaling, for thumbnail generation. Complementing each other, three retargeting strategies work together efficiently. Firstly, cropping selectively discards the unimportant regions in order to free up more space for displaying important content aesthetically. Next, warping helps to incorporate as much as possible visual information into thumbnails by rearranging important content more compactly through non-uniform deformation. Finally, scaling retrains the important content at an optimal size rather than undergoing an improper shrinkage. In our solution, warping, cropping and scaling are encoded as three energy terms of the objective function respectively, which can be solved efficiently by numerical optimization. Both qualitative and quantitative comparison results demonstrate that the proposed method achieves an excellent trade-off among smoothness, completeness and distinguishableness in thumbnail generation. Through these results, our method shows obvious superiority over state-of-the-art techniques. © 2013 Springer-Verlag.
Quang, NK, Doan Quang Vinh, That, ND & Ha, QP 1970, 'Observer-based integral sliding mode control for sensorless PMSM drives using FPGA', 2013 International Conference on Control, Automation and Information Sciences (ICCAIS), 2013 International Conference on Control, Automation and Information Sciences (ICCAIS), IEEE, Nha Trang, Vietnam, pp. 212-217.
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This paper presents the design and evaluation of an observer-based integral sliding mode controller for sensorless Permanent Magnet Synchronous Motor (PMSM) drive based on the Field Programmable Gate Array (FPGA) technology. For enhancement of robustness, a flux angle estimator mainly constructed by an improved sliding mode observer is utilized to estimate the current and back electromotive force (EMF) as well as to derive the flux angle. These estimated values together with the computed rotor speed of the motor are fed back for the control purpose in both the current loop and the speed loop. To increase the performance of PMSM speed control, an integral sliding mode control (ISMC) is designed with integral operation to improve steady state performance against parameter variations and external disturbances. The developed controller has been implemented in an FPGA-based environment and the very high speed integrated circuit-hardware description language (VHDL) is adopted to show advantages of the proposed control system. By integrating the observer-based and integral sliding mode control techniques into speed control of a PMSM drive, the system performance can be substantially enhanced while improving its cost-effectiveness and reliability. The validity of the proposed approach is verified through simulation results based on the VHDL Modelsim and Simulink co-simulation method.
Radmanesh, N, Burnett, IS & IEEE 1970, 'EFFECTIVENESS OF HORIZONTAL PERSONAL SOUND SYSTEMS FOR LISTENERS OF VARIABLE HEIGHTS', 2013 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP), IEEE International Conference on Acoustics, Speech and Signal Processing, IEEE, Vancouver, BC, Canada, pp. 316-320.
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Standard surround systems for generation of isolated wideband soundfields employ uniformly-spaced array of speakers in the horizontal plane. For these systems, the evaluation of sound reproduction with height is important due to listener's variable heights. Previous work demonstrated that controlling both the speakers' location and their complex weights using two-stage Lasso-LS pressure matching optimization allows isolated sound reproduction with limited number of speakers within the speakers' plane. This work demonstrates that deployment of this technique can also give up to 24dB in suppression of sound at heights between zero and one meter from speakers' plane over single-stage LS using e.g. 90 speakers in a semicircular array. © 2013 IEEE.
Rafiei, A, Maali, Y, Abolhasan, M, Franklin, D, Safaei, F, Smith, S & IEEE 1970, 'A Tuned Fuzzy Logic Relocation Model in WSNs Using Particle Swarm Optimization', 2013 IEEE 78TH VEHICULAR TECHNOLOGY CONFERENCE (VTC FALL), IEEE Vehicular Technology Conference, IEEE-VTS, Las Vegas, USA, pp. 1-5.
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In harsh and hostile environments, swift relocation of currently deployed nodes in the absence of centralized paradigm is a challenging issue in WSNs. Reducing the burden of centralized relocation paradigms by the distributed movement models comes at the price of unpleasant oscillations and excessive movements due to nodes' local and limited interactions. If the nodes' careless movements in the distributed relocation models are not properly addressed, their power will be exhausted. Therefore, in order to exert proper amount of virtual radial/angular push/pull forces among the nodes, a fuzzy logic relocation model is proposed and by considering linear combination of the presented performance metric(s)(i.e. coverage, uniformity, and average movement), its parameters are locally and globally tuned by particle swarm optimization(PSO). In order to tune fuzzy parameters locally and globally, PSO benefits respectively from nodes' neighbours within different ranges and all the given deployed area. Performance of locally and globally tuned fuzzy relocation models is compared with one another in addition to the distributed self-spreading algorithm (DSSA). It is shown that by applying PSO to the linear combinations of desired metric(s) to obtain tuned fuzzy parameters, the relocation model outperforms and/or is comparable to DSSA in one or more performance metric(s). Copyright © 2013 by the Institute of Electrical and Electronic Engineers, Inc.
Rafiei, A, Maali, Y, Abolhasan, M, Franklin, DR & Smith, S 1970, 'An iteratively tuned fuzzy logic movement model in WSN using particle swarm optimization.', ICSPCS, International Conference on Signal Processing and Communication Systems, IEEE, Carrara, VIC, Australia, pp. 1-7.
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In contrast to adding new nodes, relocation of deployed nodes in mobile wireless sensor networks seems to be an effective solution to cope with undesirable, unpredictable and uncontrolled network topology changes due to nodes' drift and failure. At the price of less global control, there is a trend in recent years towards giving nodes more autonomy and devising localized relocation algorithms to address challenges of network topology control in harsh and hostile environments in the absence of centralized control. Inspired by laws of nature, a large variety of distributed node relocation algorithms have been designed to alleviate undesirable oscillations caused by local interactions and uncertainties among autonomous nodes as they reach their desired formations. Force-based distributed relocation algorithms governed by virtual push-pull forces among autonomous nodes are among such aforesaid algorithms. Adapting fuzzy logic model in exerting proper amount of forces to reduce node movement oscillation seems to be promising as its conforms well with uncertainties and interactions of autonomous nodes. However, parameters of fuzzy logic relocation model should be tuned so to enable nodes to exert proper amount of forces among their in-range neighbours. In this paper, by using particle swarm optimization, parameters of fuzzy relocation model are obtained based on the desired combinations of performance metrics within nodes' range in each movement iteration. The result shows that our model either outperforms or matches DSSA movement model. © 2013 IEEE.
Rahman, BMA & Agrawal, A 1970, 'Finite Element Modeling Methods for Photonics', Artech House.
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In addition, this is the perfect support to anyone using the COMSOL Multiphysics© RF Module.
Raja Ismail, RMT, That, ND & Ha, QP 1970, 'Adaptive fuzzy sliding mode control for uncertain nonlinear underactuated mechanical systems', 2013 International Conference on Control, Automation and Information Sciences (ICCAIS), 2013 International Conference on Control, Automation and Information Sciences (ICCAIS), IEEE, Nha Trang, Vietnam, pp. 212-217.
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Sliding mode control has been shown to be a robust and effective control approach for stabilization of nonlinear systems. However the dynamic performance of the controller is a complex function of the system parameters, which is often uncertain or partially known. This paper presents an adaptive fuzzy sliding mode control for a class of underactuated nonlinear mechanical systems. An adaptive fuzzy system is used to approximate the uncertain parts of the underactuated system. The adaptive law is designed based on the Lyapunov method. The proof for the stability and the convergence of the system is presented. Robust performance of the adaptive fuzzy sliding mode control is illustrated using a gantry crane system. Simulation results demonstrate that the system output can track the reference signal in the presence of modelling uncertainties, external disturbances and parameter variation.
Ranga, Y, Thalakotuna, D, Esselle, KP, Hay, SG, Matekovits, L & Orefice, M 1970, 'A transmission polarizer based on width-modulated lines and slots', 2013 International Workshop on Antenna Technology (iWAT), 2013 International Workshop on Antenna Technology (iWAT), IEEE, Karlsruhe, GERMANY, pp. 299-302.
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Resconi, G, Braun, R & Chaczko, Z 1970, 'Geometry of a sensor networks', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), International Conference on Computer Aided Systems Theory (EUROCAST), Springer, Las Palmas, SPAIN, pp. 507-512.
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Given a set of sensors or cluster of sensors S located at different points or nodes in the ordinary space. Any sensor measures one or more values, such as Temperature. We assume that the information from all sensors at different positions in the space is transmitted to a Gateway node as a probabilistic phenomena, not in a deterministic way. The measured value X at the Gateway sensor node is a random value. Noise in the network randomly changes the original measurements. Information at the gateway is given by a distribution of the probability at the gateway sensor. We can show that given the values at the sensor node the distribution of the probability at the gateway changes. So the sensor measurements are parameters that define the distribution of the values at the gateway. The probability at the gateway is conditioned by the original measures at the sensor node. The probability approach cannot take care of the topology of the network but only of the conditional probability at the gateway conditioned by the sensors. Now we compute the derivative of the conditional Boltzmann entropy for any variation of the sensor value and for any value at the gateway X. This matrix gives us the sensor situation so we can compute the Fisher information of the sensor. It is the Hessian of the entropy average function in the space of the sensors S. The Fisher information gives us the geometry or form of the sensor space S. Sensor information is very important to obtain the form of the phenomena that we want to measure with the different sensors. Networks of sensors with their geometry go beyond the individual sensor that measures only one value and cannot discover the field or form of the physical phenomena. © 2013 Springer-Verlag Berlin Heidelberg.
Roy, NK, Pota, HR, Mahmud, A & Hossain, MJ 1970, 'D-STATCOM control in distribution networks with composite loads to ensure grid code compatible performance of photovoltaic generators', 2013 IEEE 8th Conference on Industrial Electronics and Applications (ICIEA), 2013 IEEE 8th Conference on Industrial Electronics and Applications (ICIEA 2013), IEEE, Swinburne Univ Technol, Melbourne, AUSTRALIA, pp. 55-60.
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Roy, NK, Pota, HR, Mahmud, MA & Hossain, MJ 1970, 'A control methodology for DFIG type wind turbines connected to distribution networks', 2013 IEEE Power & Energy Society General Meeting, 2013 IEEE Power & Energy Society General Meeting, IEEE, Vancouver, CANADA.
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Runchun Wang, Cohen, G, Hamilton, TJ, Tapson, J & van Schaik, A 1970, 'An improved aVLSI axon with programmable delay using spike timing dependent delay plasticity', 2013 IEEE International Symposium on Circuits and Systems (ISCAS2013), 2013 IEEE International Symposium on Circuits and Systems (ISCAS), IEEE, pp. 1592-1595.
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We present a voltage domain implementation of a programmable delay axon circuit together with measurements from it. It was designed to be a building block for a polychronous spiking neural network. The axonal delay can be programmed by presenting an input spike followed by a post-synaptic spike at the desired delay. An analogue memory was used to store this value. We also use spike timing dependent delay plasticity (STDDP) to reduce the errors in delay that result from the delay programming step. Measurements show that the proposed circuit is capable of learning and retaining delays in the range of 2 ms to 50 ms for many minutes. © 2013 IEEE.
Saghir, A, Abbas, SM, Afzal, MU, Tauqeer, T & Tariq, MH 1970, 'Compact dual band microstrip antenna design using slits', 2013 3rd IEEE International Conference on Computer, Control and Communication (IC4), 2013 3rd IEEE International Conference on Computer, Control & Communication (IC4), IEEE.
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This Paper presents the design and implementation of a microstrip patch antenna working for concurrent devices. Those devices are particularly targeted in this work whose operating frequency is 2.7GHz and 4.5GHz. Slits on the structure are placed to lengthen the current path on the surface which results in size reduction. The designed patch has compact size (16×14×1.6 mm3) that makes it beneficial for the size constrained electronic devices. To enhance the gain of the antenna, single patch was extended in the form of an array using corporate feed. The gain thus, increased from -4.32dBi to 3.05dBi. Simulations of the presented antenna are carried out using High Frequency Structure Simulator (HFSS) and it is fabricated on FR-4 substrate. Antenna is tested using Vector Network Analyzer (VNA). © 2013 IEEE.
San, PP, Ling, SH, Nguyen, HT & IEEE 1970, 'Combinational Neural Logic System and Its Industrial Application on Hypoglycemia Monitoring System', PROCEEDINGS OF THE 2013 IEEE 8TH CONFERENCE ON INDUSTRIAL ELECTRONICS AND APPLICATIONS (ICIEA), IEEE Conference on Industrial Electronics and Applications, IEEE, Melbourne, Australia, pp. 947-952.
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In this paper, a combinational neural logic network (NLN) with the neural-Logic-AND, -OR and -NOT gates is applied on the development of non-invasive hypoglycemia monitoring system. It is an alarm system which measured physiological parameters of electrocardiogram (ECG) signal and determine the onset of hypoglycemia by use of proposed NLN. Due to different nature of application, conventional neural networks (NNs) with common structure may not always guarantee the optimal solution. Based on knowledge of application, the proposed NLN is designed systematically in order to incorporate the characteristics of application into the structure of proposed network. The parameter of the proposed NLN will be trained by hybrid particle swarm optimization with wavelet mutation (HPSOWM). The proposed NLN will be practically analyzed using real data sets collected from 15 children (569 data sets) with Type 1 diabetes at the Department of Health, Government of Western Australia. By using the proposed method, the detection performance is enhanced. Compared with other conventional NNs, the proposed NLN gives better performance in terms of sensitivity and specificity.
Shimazaki, K, Yoshizawa, S, Hatakawa, Y, Matsumoto, T, Konishi, S & Miyanaga, Y 1970, 'A VLSI design of an arrayed pipelined Tomlinson-Harashima precoder for MU-MIMO systems', 2013 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, 2013 Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA), IEEE.
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Shu Wang, Zhenjiang Miao & Jian Zhang 1970, 'Simultaneously detect and segment pedestrian', 2013 IEEE International Conference on Multimedia and Expo Workshops (ICMEW), 2013 IEEE International Conference on Multimedia and Expo Workshops (ICMEW), IEEE, San Jose, USA, pp. 1-4.
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We present a framework to simultaneously detect and segment pedestrian in images. Our work is based on part-based method. We first segment the image into superpixels, then assemble superpixels into body part candidates by comparing the assembled shape with pre-built template library. A structure-based shape matching algorithm is developed to measure the shape similarity. All the body part candidates are input into our modified AND/OR graph to generate the most reasonable combination. The graph describes the possible variation of body configuration and model the constrain relationship between body parts. We perform comparison experiments on the public database and the results show the effectiveness of our framework.
Shujau, M, Ritz, CH & Burnett, IS 1970, 'Speech dereverberation based on Linear Prediction: An Acoustic Vector Sensor approach', 2013 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2013 - 2013 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), IEEE, Vancouver, BC, Canada, pp. 639-643.
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This paper introduces a dereverberation algorithm based on Linear Prediction (LP) applied to the outputs of an Acoustic Vector Sensor (AVS). The approach applies adaptive beamforming to take advantage of the directional outputs of the AVS array to obtain a more accurate LP spectrum than can be obtained with a single channel or Uniform Linear Array (ULA) with a comparable number of channels. This is then used within a modified version of the Spatiotemporal Averaging Method for Enhancement of Reverberant Speech (SMERSH) algorithm derived for the AVS to enhance the LP residual signal. In a highly reverberant environment, the approach demonstrates a significant improvement compared to a ULA as measured by both the Signal to Reverberant Ratio (SRR) and Speech to Reverberation Modulation Energy Ratio (SRMR) for sources ranging from at 1m to 5m from the array. © 2013 IEEE.
Siwakoti, YP & Town, GE 1970, 'Common-mode voltage reduction techniques of three-phase Quasi Z-Source Inverter for AC drives', 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2013 IEEE Applied Power Electronics Conference and Exposition - APEC 2013, IEEE, Long Beach, CA, pp. 2247-2252.
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Siwakoti, YP & Town, GE 1970, 'Design of FPGA-controlled power electronics and drives using MATLAB Simulink', 2013 IEEE ECCE Asia Downunder, 2013 IEEE ECCE Asia Downunder (ECCE Asia 2013), IEEE, Melbourne, VIC, Australia, pp. 571-577.
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We present a simple and rapid prototyping technique for Field Programmable Gate Array (FPGAs)-based digital controllers for power electronics and motor drives using MATLAB's Simulink and HDL Coder design software. The MATLAB/Simulink models are optimized and converted to target independent, specific and traceable Very High Speed Integrated Circuit Hardware Description Language (VHDL) code for FPGA programming. An example implementation of the space vector pulse width modulation (SVPWM) technique is presented, illustrating the design of a generic 3-phase voltage source inverter (VSI). Simulation and co-simulation, system level design, and verification for rapid prototyping of FPGA-based digital controllers will assist power electronics engineers and researchers to develop and prototypes in a relatively short time by eliminating tedious and time-consuming manual coding. This enables increased productivity and facilitates the development of power electronic controllers with more complex control algorithms. © 2013 IEEE.
Siwakoti, YP & Town, GE 1970, 'Performance of distributed DC power system using quasi Z-Source Inverter based DC/DC converters', 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 2013 IEEE Applied Power Electronics Conference and Exposition - APEC 2013, IEEE, Long Beach, CA, USA, pp. 1946-1953.
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DC microgrids for power combining and distribution are of interest in many applications due to their high efficiency, relatively low cost of installation and operation, freedom from harmonic and reactive power and stability. The quasi Z-Source Inverter (q-ZSI) is a particularly promising circuit for DC Distributed Power System (DPS) because of its unique buck-boost characteristics, high power handling capability and inbuilt fault tolerance. The buck-boost capability reduces the number of power conversion stages required and provides ride-through capability during voltage sag and swells from the grid. However, the performance of q-ZSI in DC DPS under varying sources and load conditions has not previously been investigated. We present analysis and simulation of 400V DC DPS by placing q-ZSI converters in parallel under widely varying input and output conditions. An automatic master-slave control strategy was used to share the load current among parallel converters. The results verify the benefit of q-ZSI converters in DC DPS and show that DC DPS can have good transient and steady state response and is capable of maintaining stiff DC voltage at the common bus with minimal interaction. © 2013 IEEE.
Sohail, I, Ranga, Y, Esselle, KP & Hay, SG 1970, 'A frequency selective surface with a very wide stop band', 2013 7th European Conference on Antennas and Propagation, EuCAP 2013, 7th European Conference on Antennas and Propagation (EuCAP), IEEE, Gothenburg, SWEDEN, pp. 2146-2148.
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In this paper we investigate a very wideband, single-layer, low-profile frequency selective surface (FSS) reflector. The unit cell is simple and consists of a cross-dipole and a ring made on the opposite surfaces of a single substrate layer. The proposed design exhibits a broad stop-band of 7.5 GHz, from 6.5 GHz to 14 GHz. Its refection coefficient has a linearly decreasing phase over a large bandwidth. The compact configuration provides the flexibility for mounting the reflector close to a planar bidirectional UWB antenna such as a slot antenna, to make it unidirectional, by reflecting the waves radiated towards the FSS. © 2013 EurAAP.
Sohail, I, Ranga, Y, Esselle, KP & Hay, SG 1970, 'A linear to circular polarization converter based on Jerusalem-Cross frequency selective surface', 2013 7th European Conference on Antennas and Propagation, EuCAP 2013, 7th European Conference on Antennas and Propagation (EuCAP), IEEE, Gothenburg, SWEDEN, pp. 2141-2143.
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In this paper a transmission type polarizer is presented to convert linear polarization to circular polarization. Based on a frequency-selective surface, this polarizer consists of Jerusalem Crosses printed on a RT 5870 substrate. The tuning of inductive arms and capacitive coupling between the unit cells have helped in achieving desired axial-ratio performance for the transmitted wave. The polarizer works at 17.8 GHz and provides the required 90°phase difference between the two orthogonal components, which are equal in magnitude. The structure provides around 99% polarization purity at the resonance. Theoretical analysis and results of numerical investigations related to the structure are presented. © 2013 EurAAP.
Sohail, I, Ranga, Y, Esselle, KP, Matekovits, L & Hay, SG 1970, 'Effective Electromagnetic Shielding over an ultra-wide bandwidth using a Frequency Selective Surface', 2013 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC), 2013 Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC), IEEE, Melbourne, AUSTRALIA.
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Sohail, I, Ranga, Y, Esselle, KP, Matekovits, L & Hay, SG 1970, 'Polarization stable ultra-wide-band Frequency Selective Surface for Ku- and K- band applications', 2013 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2013 International Conference on Electromagnetics in Advanced Applications (ICEAA), IEEE, pp. 802-805.
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This paper presents the design of an ultra-wide passband Frequency Selective Surface for Ku- and K- band applications. The proposed FSS exhibits an extremely large passband of 24.4 GHz in the 5.8-30.2 GHz range with an exceptional 135% fractional bandwidth. Moreover, it shows a stable transmission response for both TE and TM polarizations up to 45° of the incident angles. © 2013 IEEE.
Sohail, I, Ranga, Y, Esselle, KP, Matekovits, L & Hay, SG 1970, 'Ultra-wide band frequency selective surface filter designed for Ku- and K- band applications', 2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, IEEE, Orlando, FL, pp. 476-+.
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Song, Y, Zhang, J, Cao, L & Sangeux, M 1970, 'On Discovering the Correlated Relationship between Static and Dynamic Data in Clinical Gait Analysis', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Joint European Conference on Machine Learning and Knowledge Discovery in Databases, Springer Berlin Heidelberg, Prague, Czech Republic, pp. 563-578.
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'Gait' is a person's manner of walking. Patients may have an abnormal gait due to a range of physical impairment or brain damage. Clinical gait analysis (CGA) is a technique for identifying the underlying impairments that affect a patient's gait pattern. The CGA is critical for treatment planning. Essentially, CGA tries to use patients' physical examination results, known as static data, to interpret the dynamic characteristics in an abnormal gait, known as dynamic data. This process is carried out by gait analysis experts, mainly based on their experience which may lead to subjective diagnoses. To facilitate the automation of this process and form a relatively objective diagnosis, this paper proposes a new probabilistic correlated static-dynamic model (CSDM) to discover correlated relationships between the dynamic characteristics of gait and their root cause in the static data space. We propose an EM-based algorithm to learn the parameters of the CSDM. One of the main advantages of the CSDM is its ability to provide intuitive knowledge. For example, the CSDM can describe what kinds of static data will lead to what kinds of hidden gait patterns in the form of a decision tree, which helps us to infer dynamic characteristics based on static data. Our initial experiments indicate that the CSDM is promising for discovering the correlated relationship between physical examination (static) and gait (dynamic) data. © 2013 Springer-Verlag.
Tam, HHM, Enlong Che & Tuan, HD 1970, 'Optimized linear precoder in MIMO interference channel using D.C. programming', 2013, 7th International Conference on Signal Processing and Communication Systems (ICSPCS), 2013 7th International Conference on Signal Processing and Communication Systems (ICSPCS), IEEE, Australia, pp. 1-5.
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In this paper, we are concerned with optimized linear precoding strategies for multiple-input multiple-output interference channels (MIMO-IFC). Under practical transmission power constraints, we aim at maximizing the sum-informationrate. To date, most developments could not directly address this problem. Instead, intermediate problems of simplification have been considered by means of alternating optimization, which fails to jointly optimize all the concerned variables. In this paper, we directly solve this problem by exploring its hidden d.c. (d ¯ ifference of c ¯ onvex functions) structure. The recast problem can be iteratively solved by d.c. iterations (DCIs), which guarantees the convergence to at least a local optimum. Numerical simulation results show that the proposed solutions offer improved performance.
Thalakotuna, DNP, Karmokar, DK, Esselle, KP, Heimlich, M & Matekovits, L 1970, 'Modelling PIN diode switches in reconfigurable leaky-wave antenna design', 2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, IEEE, Orlando, FL, USA, pp. 1064-1065.
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The effect of PIN diodes on the performance of a reconfigurable leaky-wave antenna (LWA) is studied. The PIN diode is modelled in three different ways. It is shown that the non-ideal behaviour of the PIN diodes changes the predicted return loss and radiation characteristics of the antenna compared to ideal switches. © 2013 IEEE.
That, ND, Nguyen Khanh Quang, Pham Tam Thanh & Ha, QP 1970, 'Robust exponential stabilization of underactuated mechanical systems in the presence of bounded disturbances using sliding mode control', 2013 International Conference on Control, Automation and Information Sciences (ICCAIS), 2013 International Conference on Control, Automation and Information Sciences (ICCAIS), IEEE, Nha Trang, Vietnam, pp. 200-205.
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This article addresses the robust exponential stabilization problem of underactuated mechanical systems in the presence of bounded external disturbances using sliding mode control. Based on the Lyapunov method, a sufficient condition for the existence of the smallest possible ball which bounds the reduced-order sliding mode dynamics, is first derived in terms of linear matrix inequality (LMI). A sliding mode controller is then synthesized to guarantee that system state trajectories are exponentially convergent to another ball with a prespecified convergence rate. A case study of the Pendubot is provided to illustrate the effectiveness of the proposed approach.
Tran, T & Ha, QP 1970, 'Plug-and-play predictive control of modular nonlinear systems with coupling delays', 2013 IEEE International Conference on Automation Science and Engineering (CASE), 2013 IEEE International Conference on Automation Science and Engineering (CASE 2013), IEEE, Madison, Wisconsin, USA, pp. 699-704.
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This paper presents a decentralized model predictive control strategy for nonlinear network systems having multiple coupling delay elements. Linear interconnections, whose topologies are defined by an unweighted Laplacian matrix, and persistent input disturbances are considered in this development. On the ground of the incrementally accumulative quadratic constraint presented previously, the time-domain robust stabilizability conditions for nonlinear interconnected systems are developed in this work. To deal with multiple coupling delays, the accumulative dissipativity criteria for subsystems are derived for use with the accumulatively asymptotic dissipativity constraint (aADC) in the stabilizability conditions. aADC is an asymptotic constraint on the accumulation of supply rates over the window of delay time interval. A compound output in the supply rate is deployed such that the dissipativity criterion can be rendered in linear matrix inequalities. A convex stability constraint for the local optimization of the model predictive control in a fully decentralized architecture is then derived for implementations. Numerical simulation for a petrochemical process is provided to illustrate the theoretical developments. © 2013 IEEE.
Tran, T & Ha, QP 1970, 'Self-recovery control for dependable systems', 2013 IEEE International Conference on Automation Science and Engineering (CASE), 2013 IEEE International Conference on Automation Science and Engineering (CASE 2013), IEEE, Madison, Wisconsin, USA, pp. 45-50.
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The task of managing duty-standby controllers in building a dependable computerised-control system with wireless sensor networks is challenging owing to the scarcity of both information and processing resources. A novel synchronization method for redundant controllers applying techniques from dissipative systems theory is presented in this paper. As an alternative to the control summation in classical reliable control systems, only one scalar variable, which is the calculated supply rate, is exchanged among the member controllers. Thanks to this one-variable and autonomous-based approach, the reliability requirement will be met under the temporal constraint of real-time controllers whilst overcoming the latency issue and low data-package rates in wireless networks. A dissipation-based quadratic constraint with respect to the control and output increments is developed for these redundant controllers. When a failure is detected, the constraint of the standby controller will be activated from the lower bound of the supply rate being transferred from the duty controller. During the transition time, this constraint is imposed on the output increment such that the transition between the duty and standby controllers will be smooth for the output vector. © 2013 IEEE.
Tri Tran, That, ND & Ha, QP 1970, 'APRC-based decentralised model predictive control for parallel splitting systems with a matrix annihilation', 2013 International Conference on Control, Automation and Information Sciences (ICCAIS), 2013 International Conference on Control, Automation and Information Sciences (ICCAIS), IEEE, Nha Trang, Vietnam, pp. 178-183.
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A decentralised model predictive control strategy for interconnected process systems having parallel-splitting structure based on the asymptotically positive realness constraint (APRC) is presented in this paper. Parallel masking and transform descriptor approaches have been employed in previous work for this type of interconnection processes. A robust control perspective has been brought to light in this work to resolve the issue of multiple subprocess parallelised-ly decoupled in a mixed connection configuration of dynamically coupled units. An annihilation is employed to cancel out the interactive vectors between interconnected processing units. Simulation for a parallel redundant process system in mining industry is provided to demonstrate the effectiveness of the presented robust control approach to parallelised interconnected systems.
Truong, BCQ, Tuan, HD & Nguyen, HT 1970, 'Near-infrared parameters extraction: A potential method to detect skin cancer', 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), IEEE, Osaka, Japan, pp. 33-36.
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The wavelength-dependent absorption coefficients can be used to analyse optical properties of human skin. Existing absorption models for narrow ranges in the visible and near infrared are insufficient to simultaneously incorporate the spectral contrast produced by differences in chromophores, water and lipid content of skin tissue into skin cancer detection. In the broad range up to 1600 nm, recent analysis approaches for absorption spectra do not consistently provide significant differences between healthy and cancerous skins. We propose an absorption model to fit the absorption coefficient spectra of skin samples over the range from 400 nm to 1600 nm and an advanced algorithm to find the optimal estimation. The extracted parameters of this model are analysed by a statistical t-test. The test results demonstrate the significant differences between all pairs of tumour-normal skin. Therefore, our approach has strong potential for early skin cancer detection using near infrared spectroscopy (NIRS).
Tushar, W, Zhang, JA, Smith, DB, Thiebaux, S & Poor, HV 1970, 'Prioritizing Consumers in Smart Grid: Energy Management Using Game Theory', IEEE International Conference on Communications, IEEE International Conference on Communications, IEEE, IEEE, pp. 4239-4243.
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This paper explores an idea of demand-supply balance for smart grids in whichconsumers are expected to play a significant role. The main objective is tomotivate the consumer, by maximizing their benefit both as a seller and abuyer, to trade their surplus energy with the grid so as to balance the demandat the peak hour. To that end, a Stackelberg game is proposed to capture theinteractions between the grid and consumers, and it is shown analytically thatoptimal energy trading parameters that maximize customers utilities areobtained at the solution of the game. A novel distributed algorithm is proposedto reach the optimal solution of the game, and numerical examples are used toassess the properties and effectiveness of the proposed approach.
ul Huque, MTI, Munasinghe, KS, Abolhasan, M & Jamalipour, A 1970, 'EAR-BAN: Energy efficient adaptive routing in Wireless Body Area Networks', 2013, 7th International Conference on Signal Processing and Communication Systems (ICSPCS), 2013 7th International Conference on Signal Processing and Communication Systems (ICSPCS), IEEE, Gold Coast, Australia, pp. 1-10.
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Wireless Body Area Network (WBAN), a neoteric intelligent monitoring system, is envisaged to unleash a wave of personalized, advanced and integrated applications in the field of medical, fitness, sports, entertainment, military and consumer electronics. In WBAN, network longevity is a major challenge due to the limitation in the availability of energy supply and routing protocol plays a key role towards making such networks energy efficient. In this paper, we propose an energy efficient cluster based routing protocol for WBANs, named as energy efficient adaptive routing in wireless body area network (EAR-BAN). Although EAR-BAN is a cluster based routing protocol, it also combines the benefits of direct and multi hop transmission methods, depending on the energy level and spatial information of body nodes, to formalize an energy efficient, adaptive and opportunistic routing. Moreover, its centralized operation reduces the computational burden of body nodes.
ul Huque, MTI, Munasinghe, KS, Abolhasan, M & Jamalipour, A 1970, 'SEA-BAN: Semi-autonomous adaptive routing in wireless body area networks', 2013, 7th International Conference on Signal Processing and Communication Systems (ICSPCS), 2013 7th International Conference on Signal Processing and Communication Systems (ICSPCS), IEEE, Australia, pp. 1-7.
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Wireless Body Area Network (WBAN), an intelligent health monitoring system, is introduced advanced and integrated applications in the field of medical, fitness, sports, entertainment, military and consumer electronics. In WBAN, due to the limitation in the availability of energy supply, network longevity is a major challenge. Since 80% of total energy is consumed only because of communication purpose in WBAN, routing protocols play a key role towards making such networks energy efficient. In this paper, we propose an energy efficient cluster-based routing protocol for WBANs, named as semiautonomous adaptive routing in wireless body area network (SEA-BAN). SEA-BAN distributes the energy dissipation evenly among the body nodes and enhances the network lifetime. It is not simply a cluster-based routing protocol; it also combines the benefits of direct transmission and multi-hop transmission methods, depending on the energy level and spatial information of the body nodes, to formalize an adaptive routing. Moreover, its centralized operation reduces the computational burden of body nodes. The comparative analysis of our simulation results show that SEA-BAN enhances the network lifetime by more than 2 times when compared to the multi-hop transmission model and about 8.5 times than the direct transmission model.
Vakiloroaya, V, Ha, QP & IEEE 1970, 'Modeling and Control of an Energy-Efficient Hybrid Solar-Assisted Air Conditioning System', 2013 AUSTRALASIAN UNIVERSITIES POWER ENGINEERING CONFERENCE (AUPEC), Australasian Universities Power Engineering Conference, IEEE, AUPEC, pp. 1-6.
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This paper addresses the modeling and control problem of a newly-developed hybrid solar-assisted air conditioning system for improved energy efficiency. A 6kW solar-assisted direct expansion air-conditioner is used for experimentation and data collection. To increase sub-cooling of the refrigerant at partial loads, we propose a new discharge bypass line together with an inline solenoid valve, installed after the compressor to regulate the mass flow rate of the refrigerant vapor passing through a hot water storage tank. Additionally, a variable speed drive is coupled with the condenser fan to control the air flow rate and synchronized with the inline valve closing and opening. For the control purpose, a lumped parameter model is first developed to describe the system dynamics in an explicit input-output relationship; then, a linear optimal control scheme is applied for the systems multivariable control. The system has been fully-instrumented to examine its performance under different operation conditions. Numerical algorithms, implemented in a simulation tool, are then employed to predict the energy performance of the system under transient loads. Results show that up to 14% energy savings can be obtained by the proposed system.
Vakiloroaya, V, Ismail, R & Ha, QP 1970, 'Development of a New Energy-Efficient Hybrid Solar-Assisted Air Conditioning System', Proceedings of the 30th International Symposium on Automation and Robotics in Construction and Mining (ISARC 2013): Building the Future in Automation and Robotics, 30th International Symposium on Automation and Robotics in Construction and Mining; Held in conjunction with the 23rd World Mining Congress, International Association for Automation and Robotics in Construction (IAARC), Montreal Canada, pp. 54-65.
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The paper aims at developing a hybrid solar-assisted air conditioner system for performance enhancement and energy efficiency improvement. To increase sub-cooling of the refrigerant at partial loads, we propose a new discharge bypass line together with an inline solenoid valve, installed after the compressor to regulate the mass flow rate of the refrigerant vapour passing through a hot water storage tank. For control design, a lumped parameter model is first developed to describe the dynamics of the system in an explicit form of input-output relationship. The system has been fully-instrumented to examine its performance under different operation conditions. The system model is then validated by extensive experimental tests. The predictions from the models exhibit a good coincidence with experimental results, judging by an RMS error less than 15%. Based on the obtained dynamic model, a linear quadratic regulator (LQR) is applied to optimize a cost function of the output errors and control efforts. The key challenge is to regulate the refrigerant temperature entering the condenser by controlling the valve opening. The design approach is then tested in a transient simulation tool to predict the system performance in transient conditions. The experimental results obtained from implementation with PLC demonstrate that the proposed system delivers higher system efficiency owing to the higher refrigeration effect in the direct expansion evaporator. Thus, the novel development is promising for improvement of energy efficiency, enhancement of the system performance while fulfilling the cooling demand. Consequently, between 25 and 43% of monthly electricity can be saved on average.
Van Hoang, T, Truong, NLT, Trang, H & Tran, X-T 1970, 'Design and Implementation of a SoPC System for Speech Recognition', Springer Netherlands, pp. 1197-1203.
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Wang, H, Cui, Q, Tao, X, Valkama, M & Guo, YJ 1970, 'Optimal cooperative water-filling power allocation for OFDM system', 2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013 IEEE Wireless Communications and Networking Conference (WCNC), IEEE, Shanghai, China, pp. 3742-3747.
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It is well known that traditional water-filling provides a closed form solution for capacity maximization in orthogonal frequency division multiplex (OFDM) system. In this paper, cooperative power allocation is investigated in a two-transmitter multi-receiver model for OFDM systems. The local full channel state information (CSI) is available at the two transmitters respectively, where each transmitter has an individual power constrain. The transmitters first cooperate by sharing CSI, and then jointly optimize power allocation in the metric of sum throughput, which can be modeled as a convex optimization problem. Through an application of Karush-Kuhn-Tucker (KKT) conditions, the convex optimization problem is reformulated as a simplified convex one. Then the closed form solution is derived, which takes a form similar to classic water-filling principle. Based on the solution, the optimal cooperative power allocation algorithm is constructed, the structure of which can be explained as a cooperative water-filling relative to the traditional water-filling. Finally, numerical simulation is given to evaluate and demonstrate the performance of the optimal cooperative water-filling scheme. © 2013 IEEE.
Wang, S, He, X, Wu, Q & Yang, J 1970, 'Generalized local N-ary patterns for texture classification', 2013 10th IEEE International Conference on Advanced Video and Signal Based Surveillance, 2013 10th IEEE International Conference on Advanced Video and Signal Based Surveillance (AVSS), IEEE, Krakow, Poland, pp. 324-329.
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Local Binary Pattern (LBP) has been well recognised and widely used in various texture analysis applications of computer vision and image processing. It integrates properties of texture structural and statistical texture analysis. LBP is invariant to monotonic gray-scale variations and has also extensions to rotation invariant texture analysis. In recent years, various improvements have been achieved based on LBP. One of extensive developments was replacing binary representation with ternary representation and proposed Local Ternary Pattern (LTP). This paper further generalises the local pattern representation by formulating it as a generalised weight problem of Bachet de Meziriac and proposes Local N-ary Pattern (LNP). The encouraging performance is achieved based on three benchmark datasets when compared with its predecessors. © 2013 IEEE.
Wang, S, Zhang, J & Miao, Z 1970, 'A new edge feature for head-shoulder detection', 2013 IEEE International Conference on Image Processing, 2013 20th IEEE International Conference on Image Processing (ICIP), IEEE, Melbourne, Australia, pp. 2822-2826.
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In this work, we introduce a new edge feature to improve the head-shoulder detection performance. Since Head-shoulder detection is much vulnerable to vague contour, our new edge feature is designed to extract and enhance the head-shoulder contour and suppress the other contours. The basic idea is that head-shoulder contour can be predicted by filtering edge image with edge patterns, which are generated from edge fragments through a learning process. This edge feature can significantly enhance the object contour such as human head and shoulder known as En-Contour. To evaluate the performance of the new En-Contour, we combine it with HOG+LBP [1] as HOG+LBP+En-Contour. The HOG+LBP is the state-of-the-art feature in pedestrian detection. Because the human head-shoulder detection is a special case of pedestrian detection, we also use it as our baseline. Our experiments have indicated that this new feature significantly improve the HOG+LBP.
Watanabe, M, Tsutsui, H & Miyanaga, Y 1970, 'Robust speech recognition for similar pronunciation phrases using MMSE under noise environments', 2013 13th International Symposium on Communications and Information Technologies (ISCIT), 2013 13th International Symposium on Communications and Information Technologies (ISCIT), IEEE.
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Wong, GY, Leung, FHF, Ling, S-H & IEEE 1970, 'A Novel Evolutionary Preprocessing Method Based on Over-sampling and Under-sampling for Imbalanced Datasets', 39TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY (IECON 2013), Annual Conference of the IEEE Industrial Electronics Society, IEEE, Vienna, Austria, pp. 2354-2359.
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Imbalanced datasets are commonly encountered in real-world classification problems. However, many machine learning algorithms are originally designed for well-balanced datasets. Re-sampling has become an important step to preprocess imbalanced dataset. It aims at balancing the datasets by increasing the sample size of the smaller class or decreasing the sample size of the larger class, which are known as over-sampling and under-sampling respectively. In this paper, a novel sampling strategy based on both over-sampling and under-sampling is proposed, in which the new samples of the smaller class are created by the Synthetic Minority Over-sampling Technique (SMOTE). The improvement of the datasets is done by the evolutionary computational method of CHC that works on both the minority class and majority class samples. The result is a hybrid data preprocessing method that combines both over-sampling and under-sampling techniques to re-sample datasets. The evaluation is done by applying the learning algorithm C4.5 to obtain a classification model from the re-sampled datasets. Experimental results reported that the proposed approach can decrease the over-sampling rate about 50% with only around 3% discrepancy on the accuracy. © 2013 IEEE.
Woolford, S, Burnett, IS & IEEE 1970, 'A NOVEL ONE SHOT OBJECT PROFILOMETRY SYSTEM USING DIRECT SEQUENCE SPREAD SPECTRUM PROFILOMETRY', 2013 IEEE 11TH IVMSP WORKSHOP: 3D IMAGE/VIDEO TECHNOLOGIES AND APPLICATIONS (IVMSP 2013), IEEE IVMSP Workshop - D Image/Video Technologies and Applications, IEEE, Seoul, South Korea.
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In this paper a new method of determining 3D object shape using patterns derived from Direct Sequence Spread Spectrum (DSSS) and an Unscented Kalman Filter (UKF) is presented. First a binary message is encoded via Binary Phase Shift Keying (BPSK), and spread using pseudo-random spreading to create a pattern. An Iterative Unscented Kalman Filter (IUKF) is then used to determine the deformation in the pattern due to an object, and a Kalman smoother is used to reduce noise in the deformation estimation. Results show that the iterative UKF is able to determine the deformation in the pattern with a lower absolute error residual between the ground truth and estimated deformation than the non-iterated UKF. Results of the accompanying Cramer-Rao lower bounds show that the lower bound on the DSSS Pattern is lower than that of the fringe pattern. © 2013 IEEE.
Xiangling Li, Qimei Cui, Xiaofeng Tao, Xianjun Yang, Rehman, WU & Jay Guo, Y 1970, 'Performance bounds of compressed sensing recovery algorithms for sparse noisy signals', 2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013 IEEE Wireless Communications and Networking Conference (WCNC), IEEE, Shanghai, China, pp. 2884-2889.
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Recently, the performance bounds of the compressed sensing (CS) recovery algorithms have been investigated in the noisy setting. However, most of the papers only focus on the noisy measurement model where the signal is noiseless and the noise enters after the CS operation. The noisy signal model where both the signal and the compressed measurements are contaminated by the different noises is not considered. This paper works on the noisy signal model and provides the performance bounds for the following popular recovery algorithms: thresholding and orthogonal matching pursuit (OMP), Dantzig selector (DS) and basis pursuit denoising (BPDN). The performance of the recovery algorithms is quantified as the ℓ 2 distance between the reconstructed signal and the true noisy signal. Next, the impacts of the noise are analyzed on the basis of the quantified performance. The analysis results show that the effective way to restrain the impact of the noise is to choose the measurement matrix with low correlation between the columns or the rows. Finally, the theoretical bounds are verified with numerical simulations by calculating the mean-squared-error for the different noise variances. The simulation results show that OMP owns the better performance than the other three recovery algorithms under the noisy signal model. © 2013 IEEE.
Xihao, S & Miyanaga, Y 1970, 'Dynamic time warping for speech recognition with training part to reduce the computation', International Symposium on Signals, Circuits and Systems ISSCS2013, 2013 International Symposium on Signals, Circuits and Systems (ISSCS), IEEE.
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Xihao, S & Miyanaga, Y 1970, 'Dynamic time warping for speech recognition with training part to reduce the computation', International Symposium on Signals, Circuits and Systems ISSCS2013, 2013 International Symposium on Signals, Circuits and Systems (ISSCS), IEEE.
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Dynamic time warping (DTW) is a popular automatic speech recognition (ASR) method based on template matching[1] [2]. DTW algorithm compares the parameters of an unknown word with the parameters of one reference template. But the recognition rate is limited. To increase the number of reference templates for the same word will improve the recognition rate, but it will lead to spend a lot of computing time and memory resource. In this paper we proposed a method to reduce the number of reference templates, thus reduces the computing time and memory resource and also keep the high recognition rate. © 2013 IEEE.
Xu, J, Wu, Q, Zhang, J, Shen, F & Tang, Z 1970, 'Training boosting-like algorithms with semi-supervised subspace learning', 2013 IEEE International Conference on Image Processing, 2013 20th IEEE International Conference on Image Processing (ICIP), IEEE, Melbourne, Australia, pp. 4302-4306.
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Boosting algorithms have attracted great attention since the first real-time face detector by Viola & Jones through feature selection and strong classifier learning simultaneously. On the other hand, researchers have proposed to decouple such two procedures to improve the performance of Boosting algorithms. Motivated by this, we propose a boosting-like algorithm framework by embedding semi-supervised subspace learning methods. It selects weak classifiers based on class-separability. Combination weights of selected weak classifiers can be obtained by subspace learning. Three typical algorithms are proposed under this framework and evaluated on public data sets. As shown by our experimental results, the proposed methods obtain superior performances over their supervised counterparts and AdaBoost. © 2013 IEEE.
Xu, W, Miao, Z, Zhang, J, Zhang, Q & Wu, H 1970, 'Spatial-Temporal Context for Action Recognition Combined with Confidence and Contribution Weight', 2013 2nd IAPR Asian Conference on Pattern Recognition, 2013 2nd IAPR Asian Conference on Pattern Recognition (ACPR), IEEE, Naha, JAPAN, pp. 576-580.
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Yang, X, Dutkiewicz, E, Cui, Q, Huang, X, Tao, X & Fang, G 1970, 'Analog compressed sensing for multiband signals with non-modulated Slepian basis', 2013 IEEE International Conference on Communications (ICC), ICC 2013 - 2013 IEEE International Conference on Communications, IEEE, Budapest, Hungary, pp. 4941-4945.
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Recently, the recovery performance of analog Compressed Sensing (CS) has been significantly improved by representing multiband signals with the modulated and merged Slepian basis (MM-Slepian dictionary), which avoids the frequency leakage effect of the Discrete Fourier Transform (DFT) basis. However, the MM-Slepian dictionary has a very large scale and corresponds to a large-scale measurement matrix, which leads to high recovery computational complexity. This paper resolves the above problem by modulating and band-limiting the multiband signal rather than modulating the Slepian basis. Specifically, instead of using the MM-Slepian dictionary to represent the whole multiband signal, we propose to use the non-modulated Slepian basis to represent the modulated and band-limited version of the multiband signal based on the recently proposed Modulated Wideband Converter (MWC). Furthermore, based on the analytical derivation with the non-modulated Slepian basis, we propose an Interpolation Recovery (IR) algorithm to take full advantage of the Slepian basis, whereas the Direct Recovery (DR) algorithm using the Moore-Penrose pseudo-inverse cannot achieve this. Simulation results verify that, with low recovery computational load, the non-modulated Slepian basis combined with the IR algorithm improves the recovery SNR by up to 35 dB compared with the DFT basis in noise-free environment. © 2013 IEEE.
Yao, Y, Lu, DC & Verstraete, D 1970, 'Power loss modelling of MOSFET inverter for low-power permanent magnet synchronous motor drive', 2013 1st International Future Energy Electronics Conference (IFEEC), 2013 1st International Future Energy Electronics Conference (IFEEC), IEEE, Tainan, Taiwan, Taiwan, pp. 849-854.
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This paper investigates an analytical power loss modeling method applied to a threephase voltage source inverter, aiming to obtain an accurate inverter loss without the need of extensive experimental measurement, under the context of inverter efficiency optimization. Modeling of semiconductor is achieved through analytical equations for conduction and switching losses in the MA TLAB/Simulink environment, using drain-to-source current and voltage waveforms. An experimental verification consisting of low power DC-source, three-phase MOSFET inverter and brushless dc motor, is conducted to validate the loss model. It is found that the modeled power loss is generally consistent with experimental verification at incremental dc-link voltage from 12V-18V, with inverter efficiencies in the 94.7-97.4% and 94.5- 97.2% regions, respectively. The developed loss model can be used in fast inverter-motor drive power loss optimization where losses depend on circuit parameters and operating point of motor, which are accounted for in the developed model. © 2013 IEEE.
Yoshizawa, S, Hatakawa, Y, Matsumoto, T, Konishi, S & Miyanaga, Y 1970, 'Hardware implementation of an interference canceller for IDMA wireless communications', 2013 International Symposium on Intelligent Signal Processing and Communication Systems, 2013 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS), IEEE.
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Yoshizawa, S, Sugitani, M & Miyanaga, Y 1970, 'Effectiveness of cover and reflector in receiver antennas for MIMO line-of-sight channels', 2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013 IEEE 24th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), IEEE.
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Yuedong Zhan, Youguang Guo & Jianguo Zhu 1970, 'Rotor field orientation speed and torque control of BDFM with adaptive second order sliding mode', 2013 International Conference on Electrical Machines and Systems (ICEMS), 2013 International Conference on Electrical Machines and Systems (ICEMS), IEEE, Busan, Korea, pp. 2105-2109.
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This paper presents two cascaded second order sliding mode controllers (SOSMCs) for brushless doubly fed motor (BDFM) adjustable speed system, which regulate the speed and torque. And an adaptive super twisting algorithm is incorporated into the SOSMCs to adaptively regulate the law of SOSMC. The proposed controllers for BDFM eliminate the average chattering encountered by most sliding mode control (SMC) schemes, and also possess the robustness and excellent static and dynamic performances of SMC. Simulation results show that the proposed control strategy is feasible, proper and effective.
Yuwono, M, Su, SW, Guo, Y, Li, J, West, S & Wall, J 1970, 'Automatic Feature Selection using Multiobjective Cluster Optimization for Fault Detection in a Heating Ventilation and Air Conditioning System', 2013 FIRST INTERNATIONAL CONFERENCE ON ARTIFICIAL INTELLIGENCE, MODELLING AND SIMULATION (AIMS 2013), International Conference on Artificial Intelligence, Modelling and Simulation, IEEE, Kota Kinibalu, Malaysia, pp. 171-176.
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The performance of Automatic Fault Detection and Diagnostics (AFDD) algorithms to identify faults in complex building Heating Ventilation and Air-Conditioning (HVAC) systems depend on the appropriateness of features. This paper proposes a knowledge-discovery approach for discovering characteristic features using Multi-Objective Clustering Rapid Centroid Estimation (MOC-RCE). The proposed method has been tested on experimental fault data from the American Society of Heating, Refrigerating and AirConditioning Engineers (ASHRAE) research project 1312-RP Winter 2008 dataset. An experiment involving 100 clustering trials shows that using the proposed method, on average 15 characteristic features have been selected from the original 320 features. Sensitivity, specificity, accuracy, precision, and F-score values of greater than 95% are achieved with the provided features.
Yuwono, M, Su, SW, Moulton, BD, Nguyen, HT & IEEE 1970, 'Unsupervised segmentation of heel-strike IMU data using rapid cluster estimation of wavelet features', 2013 35TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), International Conference of the IEEE Engineering in Medicine and Biology Society, IEEE, OSaka, Japan, pp. 953-956.
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When undertaking gait-analysis, one of the most important factors to consider is heel-strike (HS). Signals from a waist worn Inertial Measurement Unit (IMU) provides sufficient accelerometric and gyroscopic information for estimating gait parameter and identifying HS events. In this paper we propose a novel adaptive, unsupervised, and parameter-free identification method for detection of HS events during gait episodes. Our proposed method allows the device to learn and adapt to the profile of the user without the need of supervision. The algorithm is completely parameter-free and requires no prior fine tuning. Autocorrelation features (ACF) of both anteroposterior acceleration (aAP) and medio-lateral acceleration (aML) are used to determine cadence episodes. The Discrete Wavelet Transform (DWT) features of signal peaks during cadence are extracted and clustered using Swarm Rapid Centroid Estimation (Swarm RCE). Left HS (LHS), Right HS (RHS), and movement artifacts are clustered based on intra-cluster correlation. Initial pilot testing of the system on 8 subjects show promising results up to 84.3%9.2% and 86.7%6.9% average accuracy with 86.8%9.2% and 88.9%7.1% average precision for the segmentation of LHS and RHS respectively.
Zeb, BA & Esselle, KP 1970, 'A wideband resonant cavity antenna based on a single layer superstrate', 2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, IEEE, Orlando, FL, pp. 750-751.
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Zeb, BA, Hashmi, RM, Esselle, KP & Ge, Y 1970, 'The use of reflection and transmission models to design wideband and dual-band Fabry-Perot cavity antennas (invited paper)', 2013 International Symposium on Electromagnetic Theory, EMTS 2013 - Proceedings, URSI International Symposium on Electromagnetic Theory (EMTS), IEEE, Int Union Radio Sci Japanese Comm, Commiss B, Hiroshima, JAPAN, pp. 1084-1087.
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This paper explores how wideband and multi-band performance can be achieved in Fabry-Perot resonant cavity antennas using two design methodologies, one based on a Reflection Model of a unit cell and the other based on a Transmission Model of a unit cell. In particular, two wideband antenna designs and two dual-band designs are considered. They include low-profile planar metallo-dielectric antennas based on one printed dielectric slab and very simple antennas based on two unprinted all-dielectric slabs. Desired wideband or multi-band performance is achieved either by engineering the reflection phase and magnitude of the superstrate using the Reflection Model or by extending the defect-mode bandwidth using the Transmission Model. Key theoretical and experimental results are presented to highlight the advantages of selected antenna designs. © 2013 IEICE.
Zeng, C, Jia, W, He, X & IEEE 1970, 'TEXT DETECTION IN BORN-DIGITAL IMAGES USING MULTIPLE LAYER IMAGES', 2013 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP), International Conference on Acoustics, Speech and Signal Processing, IEEE, Vancouver Canada, pp. 1947-1951.
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In this paper, a new framework for detecting text from webpage and email images is presented. The original image is split into multiple layer images based on the maximum gradient difference (MGD) values to detect text with both strong and weak contrasts. Connected component processing and text detection are performed in each layer image. A novel texture descriptor named T-LBP, is proposed to further filter out non-text candidates with a trained SVM classifier. The ICDAR 2011 born-digital image dataset is used to evaluate and demonstrate the performance of the proposed method. Following the same performance evaluation criteria, the proposed method outperforms the winner algorithm of the ICDAR 2011 Robust Reading Competition Challenge 1. © 2013 IEEE.
Zhan, Y, Youguang Guo & Zhu, J 1970, 'Control of redundancy PEM fuel cells in UPS applications with improved performance and durability', 2013 International Conference on Electrical Machines and Systems (ICEMS), 2013 International Conference on Electrical Machines and Systems (ICEMS), IEEE, Busan, Korea, pp. 306-310.
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To guarantee the reliable operation of 24 hours, improve the performance and durability of a proton exchange membrane fuel cell (PEMFC) stack, and prevent it from sudden failure in an uninterruptible power system (UPS) with hybrid backup redundancy PEMFCs, battery and supercapacitor (SC) power sources, this paper conducts research in smart power management and control strategy of two PEMFCs and UPS. Firstly, based on the analysis of the major degradation mechanisms of different components of PEMFC against the operation conditions, two PEMFCs are proposed and applied to the UPS system. The experimental results show that the proposed intelligent energy management and control strategy can effectively guarantee the power sources supplied to UPS, and automatically switch the power supply between two PEMFCs.
Zhang, G & Heusdens, R 1970, 'Bi-alternating direction method of multipliers', 2013 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2013 - 2013 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), IEEE, Vancouver, BC, Canada, pp. 3317-3321.
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The alternating-direction method of multipliers (ADMM) has been widely applied in the field of distributed optimization and statistic learning. ADMM iteratively approaches the saddle point of an augmented Lagrangian function by performing three updates per-iteration. In this paper, we propose a bi-alternating direction method of multipliers (BiADMM) that iteratively minimizes an augmented bi-conjugate function. As a result, the convergence of BiADMM is naturally established. Unlike ADMM that always involves three updates per iteration, BiADMM opens up an avenue to perform either two or three updates per iteration, depending on the functional construction. As an application, we consider applying BiADMM for the lasso problem. Experimental results demonstrate the effectiveness of our new method.
Zhang, G & Heusdens, R 1970, 'Proximal alternating-direction message-passing for MAP LP relaxation', 2013 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2013 - 2013 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), IEEE, Vancouver, BC, Canada, pp. 3402-3406.
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Linear programming (LP) relaxation for MAP inference over (factor) graphic models is one of the fundamental problems in machine learning. In this paper, we propose a new message-passing algorithm for the MAP LP-relaxation by using the proximal alternating-direction method of multipliers (PADMM). At each iteration, the new algorithm performs two layers of optimization, that is node-oriented optimization and factor-oriented optimization. On the other hand, the recently proposed augmented primal LP (APLP) algorithm, based on the ADMM, has to perform three layers of optimization. Our algorithm simplifies the APLP algorithm by removing one layer of optimization, thus reducing the computational complexities and further accelerating the convergence rate. We refer to our new algorithm as the proximal alternating-direction (PAD) algorithm. Experimental results confirm that the PAD algorithm indeed converges faster than the APLP method.
Zhang, G & Heusdens, R 1970, 'Simplified alternating-direction message passing for dual MAP LP-relaxation', 2013 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 2013 - 2013 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), IEEE, Vancouver, BC, Canada, pp. 3397-3401.
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The approximate MAP inference over (factor) graphic models is of great importance in many applications. Due to its simplicity, linear-programming (LP) relaxation has become one of the most popular approaches to approximate MAP. In this paper, we propose a new message passing algorithm for the MAP LP-relaxation problem by using the alternating-direction method of multipliers (ADMM). At each iteration, the new algorithm performs two layers of optimization sequentially, that is node-oriented optimization and factor-oriented optimization. On the other hand, the recently proposed augmented dual LP (ADLP) algorithm, also based on the ADMM, has to perform three layers of optimization. We refer to our new algorithm as the simplified ADLP (SiADLP) algorithm. The design of the SiADLP algorithm stems from a new formulation for the dual LP problem. Experimental results show that the SiADLP algorithm outperforms the ADLP method.