Publications

Brookes, W 1997, 'A type description language supporting interoperability in open distributed systems' in IFIP Advances in Information and Communication Technology, Springer US, pp. 20-35.
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Bone, DJ 1997, 'Orthonormal fractal image encoding using overlapping blocks', Fractals, vol. 5, no. SUPPL. 1, pp. 187-199.
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This paper presents a novel approach to partitioned fractal image encoding. In this we seek to address a number of problems with earlier fractal encodings. These are: the artefacts associated with the Block based approaches at high compression ratios; accuracy limitations imposed by the constraint that only one domain block is used to construct each range block; convergence problems which have required that constraints be imposed on the scaling coefficients to ensure that the mapping functions are contractive. These problems are addressed with a technique based on an orthonormal basis expansion using overlapping blocks, where the basis is partly fixed and partly derived from the image in such a way as to take advantage of local interscale self similarity. A fractal image codec based on this technique, which we call the Lapped Orthogonal Fractal Transform (LOFT), is described and tested, and the results are compared to those of other codecs.

Brookes, W, Crawley, S, Indulska, J, Kosovic, D & Vogel, A 1997, 'Types and their management in open distributed systems', Distributed Systems Engineering, vol. 4, no. 4, pp. 177-190.
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Open distributed processing aims to support cooperation within and between large-scale heterogeneous and autonomous computing environments. An inherent issue in such environments is enabling the interoperation of objects whose interfaces have been defined in different type models. In this paper, we present a type management system which provides a means for representing, storing, retrieving and translating types, and for expressing and evaluating relationships between types in a heterogeneous distributed computing environment. This system allows multiple type languages and models, and can relate types expressed in different ones. The type management system is designed to support the instantiation and dynamic binding of objects, run-time type checking of object interactions, and the discovery of new resources (e.g. services) within the system. Current approaches to interface definition in distributed systems are mainly based on the use of a single interface definition language (IDL). While this provides a level of common agreement about the types of system interfaces, the type models of existing IDLs are not rich enough to model either the overall architecture of a system or the behaviour of objects. We illustrate this by briefly describing some aspects of an enhanced type model with the emphasis on the model's impact on the design of the type management system. © 1997 The British Computer Society.

Burnett, I 1997, 'The waveform interpolation paradigm. Foundation of a class of speech coders', TENCON '97 Brisbane - Australia. Proceedings of IEEE TENCON '97. IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications (Cat. No.97CH36162), vol. 1, pp. 28-28.
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Burnett, IS & Pham, DH 1997, 'Multi-prototype waveform coding using frame-by-frame analysis-by-synthesis', 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing, vol. 2, pp. 1567-1570.
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Chong, NR, Burnett, IS, Chicharo, JF & Thomson, MM 1997, 'The effects of noise on the waveform interpolation speech coder', TENCON '97 Brisbane - Australia. Proceedings of IEEE TENCON '97. IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications (Cat. No.97CH36162), vol. 2, pp. 609-612.
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Cucchiara, R, Di Stefano, L, Piccardi, M & Cinotti, TS 1997, 'The GIOTTO System: a Parallel Computer for Image Processing', Real-Time Imaging, vol. 3, no. 5, pp. 343-353.
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This paper presents the GIOTTO system, a parallel computer based on a scalable single instruction, multiple data (SIMD) array of processors specially conceived for image processing, The system is characterized by a reduced-size array and a novel organiza

Fu, K, Guo, YJ & Barton, SK 1997, 'Performance of the EY-NPMA Protocol', Wireless Personal Communications, vol. 4, no. 1, pp. 41-50.
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The throughput of the Elimination Yield Non-pre-emptive Priority Multiple Access (EY-NPMA) protocol, which has been chosen as the medium access control (MAC) protocol for HIPERLAN, is simulated. Connection between users is based on a statistical model of path loss with power law against distance and 6 dB log-normal shadowing. It is shown that the throughput performance of the EY-NPMA protocol in networks of moderate size and with small proportion of hidden nodes is satisfactory. For a fully connected network, the throughput reaches 0.85 at an offered traffic of 1 and remains at this level. The maximum throughput reduces gradually when the number of hidden node pairs in the network is increased. With 11% of hidden nodes in the network the peak throughput falls to 0.6.

Gay, V & Leydekkers, P 1997, 'Multimedia in the ODP-RM standard', IEEE MULTIMEDIA, vol. 4, no. 1, pp. 68-73.
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Gillies, DAG, Guo, YJ & Barton, SK 1997, 'Synchronisation Techniques for HIPERLAN', Wireless Personal Communications, vol. 4, no. 1, pp. 1-10.
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Timing recovery in the High Performance Radio Local Area Network (HIPERLAN) standard is likely to be performed with the aid of synchronisation sequences embedded in the user data, which will be detected with matched filters. A directed search using a form of genetic algorithm has been performed to obtain suitable sequences of lengths up to 80 bits, and simulations of their performance have been undertaken. Performance of the sequences has been measured under the severe channel conditions that pertain in the indoor environment.

Guo, YJ, Paez, A, Sadeghzadeh, RA & Barton, SK 1997, 'A circular patch antenna for radio LAN's', IEEE Transactions on Antennas and Propagation, vol. 45, no. 1, pp. 177-178.
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Jian Zhang, Frater, MR, Arnold, JF & Percival, TM 1997, 'MPEG 2 video services for wireless ATM networks', IEEE Journal on Selected Areas in Communications, vol. 15, no. 1, pp. 119-128.
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Audio-visual and other multimedia services are seen as an important source of traffic for future telecommunications networks, including wireless networks. In this paper, we examine the impact of the properties of a 50 Mb/s asynchronous transfer mode (ATM

Kervella, B & Gay, V 1997, 'MHEGAM - A multimedia messaging system', IEEE MULTIMEDIA, vol. 4, no. 4, pp. 22-29.
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MHEGAM (MHEG-1 Advanced Mail) is a complete multimedia messaging system for the creation, exchange, and restitution of multimedia messages that express spatial and temporal synchronization among their components. MHEGAM can be based on the standard messa

Liu, Y & Hoang, DB 1997, 'OSI remote procedure call: Standardization issues, design and implementation', COMPUTER COMMUNICATIONS, vol. 20, no. 6, pp. 462-474.
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OSI Remote Procedure Call (RPC) has been identified as an essential communications and distribution mechanism for open distributed processing environments. This paper presents a design and implementation of an RPC protocol based on the ISO's second Commi

Ni, J & Burnett, IS 1997, 'Waveform interpolation at bit rates above 2.4kb/s', IEEE TENCON'97 - IEEE REGIONAL 10 ANNUAL CONFERENCE, PROCEEDINGS, VOLS 1 AND 2, vol. 2, pp. 601-604.
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Parry, JJ, Burnett, IS & Chicharo, JF 1997, 'The consequences of linguistic perception on low-rate speech coding', 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing, vol. 2, pp. 1383-1386.
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Piccardi, M, Cucchiara, R, Bariani, M & Mello, P 1997, 'Exploiting symbolic learning in visual inspection', Advances In Intelligent Data Analysis, vol. 1280, pp. 223-234.
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The paper describes the use of data analysis techniques in the computer-vision inspection of industrial workpieces. Computer-vision inspection aims at accomplishing quality verification of fabricated parts by means of automated visual procedures. Gatheri

Tuan, HD 1997, 'Can linear programs be used to test global optimization algorithms?', Computing, vol. 59, no. 1, pp. 91-93.
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Tuan, HD & Hosoe, S 1997, 'A new design method for regulator problems for singularly perturbed systems with constrained control', IEEE Transactions on Automatic Control, vol. 42, no. 2, pp. 260-264.
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Tuan, HD & Hosoe, S 1997, 'On a state-space approach in robust control for singularly perturbed systems', International Journal of Control, vol. 66, no. 3, pp. 435-462.
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TUAN, HD & HOSOE, S 1997, 'On Robust and H∞ Controls for a Class of Linear and Bilinear Systems with Nonlinear Uncertainty**An earlier version of this paper was presented at the IFAC Symposium on Nonlinear Control Systems Design, which was held in Tahoe, CA during 25–28 June 1995. The Published Proceedings of this IFAC Meeting may be ordered from: Elsevier Science Limited, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, U.K. This paper was recommended for publication in revised form by Associate Editor Matthew R. James under the direction of Editor Tamer Başar.', Automatica, vol. 33, no. 7, pp. 1373-1377.
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Burnett, I 1970, 'Waveform interpolation paradigm - foundation of a class of speech coders', IEEE Region 10 Annual International Conference, Proceedings/TENCON, p. 1.
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The waveform interpolation (WI) paradigm offers effective, high-perceptual quality speech coding at low-rates by representing speech/residual as an evolving set of pitch cycle waveforms. The formation of the speech/residual into an evolving surface of phase-aligned characteristic waveforms and the subsequent decomposition of that surface into near-independent evolving surfaces for quantization may be the most distinctive feature of WI coding. The technique attains high quality at low rates by utilizing smooth interpolation of almost all its parameters requiring careful consideration of events. The technique is a truly hybrid speech coding algorithm, performing analysis in both the time and discrete frequency domains.

Burnett, IS & Ni, J 1970, 'Waveform interpolation and analysis-by-synthesis-a good match?', 1997 IEEE Workshop on Speech Coding for Telecommunications Proceedings. Back to Basics: Attacking Fundamental Problems in Speech Coding, 1997 IEEE Workshop on Speech Coding for Telecommunications Proceedings. Back to Basics: Attacking Fundamental Problems in Speech Coding, IEEE, POCONO MANOR, PA, pp. 29-30.
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Cucchiara, R, Callipo, A & Piccardi, M 1970, 'Block processing on multiprocessor DSPs for multimedia applications', Proceedings of First Signal Processing Society Workshop on Multimedia Signal Processing, First Signal Processing Society Workshop on Multimedia Signal Processing, IEEE, PRINCETON, NJ, pp. 439-444.
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Cucchiara, R, Piccardi, M, Bariani, M & Mello, P 1970, 'Learning for feature selection and shape detection', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Springer Berlin Heidelberg, pp. 535-542.
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© Springer-Verlag Berlin Heidelberg 1997. The paper proposes a general framework for shape detection based on supervised symbolic learning. Differently from other visual systems exploiting machine learning, the proposed architecture does not follow the object segmentation - feature extraction and (learning based) classification approach. Instead, an initial data-driven processing selects points of interest in the scene by means of complex features which hypothesize the presence of the target shape; hypotheses are validated by a classifier defined by a machine learning algorithm. Learning is exploited not only for defining the model, i.e. the description of the target for the classifier, but also for defining the description language, i.e. the feature set useful in generating reliable object hypotheses. The proposed architecture of visual system has been implemented for an industrial application of unstructured shape detection: examples and results are reported in the paper.

Echizen-ya, H, Araki, K, Miyanaga, Y & Tochinai, K 1970, 'An improvement in the selection process of machine translation using inductive learning with genetic algorithms', Proceedings of the fifth conference on Applied natural language processing Descriptions of system demonstrations and videos -, the fifth conference, Association for Computational Linguistics.
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Guerin, S, Guo, YJ & Barton, SK 1970, 'Indoor propagation measurements at 5 GHz for HIPERLAN', IEE Conference Publication.
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Indoor propagation measurements for HIPERLAN at 5 GHz are reported. Using two patch antennas designed for HIPERLAN, one being fixed at the ceiling of a meeting room and the other being moved around in the room, the path loss, delay profiles and delay parameters are obtained. The effect of multiple reflection is demonstrated by the direction of arrival (DOA) measurements.

Hoang, DB, James, M & IEEE 1970, 'Stability and discriminative properties of the AMI model', 1997 IEEE INTERNATIONAL CONFERENCE ON NEURAL NETWORKS, VOLS 1-4, IEEE, USA, pp. 270-274.
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We consider a basic biologically plausible neural circuit that employs supragranular self-gain, negative feedback via inhibitory infragranular neuron. Such circuitry has been used as fundamental building blocks in the AMI (a model of intelligence) modula

Ince, EA, Guo, YJ & Barton, SK 1970, 'T-algorithm detection of partial response continuous phase modulated signals over multipath channels', IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, pp. 1135-1139.
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This paper presents a new approach to reduced complexity detection of partial response continuous phase modulated signals over channels with severe intersymbol interference (ISI). The detector combines the overall channel response for the CPM modulator with that of a multipath channel to calculate the branch metrics of a breadth-first sequential detection algorithm known as the T-algorithm. To our knowledge the reported work is the first attempt to make use of such a technique for equalization of quaternary partial response CPM signals transmitted over multipath channels. Simulation of the performance of the receiver in multipath channels is reported.

Ince, EA, Vorizanakis, N, Guo, YJ & Barton, SK 1970, 'Breadth-first sequential detection of PR-CPM signals over AWGN and multipath channels', Proceedings of IEEE International Symposium on Information Theory, IEEE International Symposium on Information Theory, IEEE, pp. 496-496.
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Detection of partial response continuous phase modulated signals over AWGN and multipath channels is presented. The receiver uses a breadth-first sequential detection algorithm known as the M-algorithm (MA). Compared with the maximum likelihood receiver based on the Viterbi algorithm (VA), a significant reduction in complexity is obtained in the proposed receiver while maintaining good performance. © 1997 IEEE.

Jian Zhang, Arnold, JF, Frater, MR & Pickering, MR 1970, 'Video error concealment using decoder motion vector estimation', TENCON '97 Brisbane - Australia. Proceedings of IEEE TENCON '97. IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications (Cat. No.97CH36162), TENCON '97 Brisbane - Australia IEEE TENCON '97 IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications, IEEE, QUEENSLAND UNIV TECHNOL, BRISBANE, AUSTRALIA, pp. 777-780.
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Parry, JJ, Burnett, IS & Chicharo, JF 1970, 'Cross-language performance study of vector quantization', IEEE Workshop on Speech Coding for Telecommunications Proceedings, pp. 79-80.
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This paper investigates the performance of split Vector Quantization (VQ) of Line Spectral Frequencies (LSFs) across a set of 10 modern languages. Spectral quantization accounts for a significant portion of the bit allocation in low-rate speech coding. Split VQ of LSFs can achieve transparent quantization of the Linear Prediction Coefficients at 24 bits/frame. In this work, codebooks are trained on individual languages and the cross-language VQ performance was measured using Spectral Distortion (SD). The results show that the spectral structure of the codebook training language influences the performance of the VQ. The number of bits/frame required for transparent speech varied by as much a 2 bits across languages.

Tellambura, C, Guo, YJ & Barton, SK 1970, 'Noniterative approach for computing linear equaliser tap weights', IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, pp. 302-306.
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A fast computation method for the tap weights of a linear equaliser is developed. By approximating the channel autocorrelation matrix, which has a Toeplitz structure, by a circulant matrix, the tap weights can be solved via discrete fourier transform (DFT) techniques. For an equaliser with N taps, the approximate tap weights approach the exact tap weights as N → ∞. Excess mean-square error and bit error rate (BER) degradation caused by the approximate tap weights are computed for a representative channel.

Tellambura, C, Johnson, IR, Guo, YJ & Barton, SK 1970, 'Equalization and frequency offset correction for HIPERLAN', IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, pp. 796-800.
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To reduce the effects of inter-symbol interference resulting from the dispersive nature of the indoor radio channel most HIPERLAN receivers will incorporate an adaptive equalizer. In this paper, computational complexity of several equalizer algorithms is estimated. The effect of frequency offset between transmitter and receiver on the performance of such an equalizer is investigated. By employing a decision feedback equalizer incorporating a second order phase locked loop, the effect of both the intersymbol interference and frequency offset can be significantly reduced. Using such a technique, the packet error ratio (PER) of a HIPERLAN radio link in a multipath channel is found by simulation.

Tuan, HD, Hosoe, S & Tuy, H 1970, 'DC optimization approach to robust controls: the optimal scaling value problem', Proceedings of the 1997 American Control Conference (Cat. No.97CH36041), Proceedings of 16th American CONTROL Conference, IEEE, ALBUQUERQUE, NM, pp. 350-355.
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Wan, E & Bone, D 1970, 'Interpolating earth-science data using RBF networks and mixtures of experts', Advances in Neural Information Processing Systems, 10th Annual Conference on Neural Information Processing Systems (NIPS), M I T PRESS, DENVER, CO, pp. 988-994.
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We present a mixture of experts (ME) approach to interpolate sparse, spatially correlated earth-science data. Kriging is an interpolation method which uses a global covariation model estimated from the data to take account of the spatial dependence in the data. Based on the close relationship between kriging and the radial basis function (RBF) network (Wan & Bone, 1996), we use a mixture of generalized RBF networks to partition the input space into statistically correlated regions and learn the local covariation model of the data in each region. Applying the ME approach to simulated and real-world data, we show that it is able to achieve good partitioning of the input space, learn the local covariation models and improve generalization.