Alwast, T, Miliszewska, I & Leung, C 1996, 'A decision support system architecture using agents and data warehousing', International Journal of Information and Management Sciences, vol. 7, no. 4, pp. 26-41.
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A generic architecture incorporating agent based and data warehousing technologies for the design of decision support systems (DSS) is presented. The architecture consists of an interface agent, control and service agents, and a warehouse agent organized in a hierarchical structure which supports cooperative problem solving. The architecture has been designed to support DSS type query processing and to provide a framework for integrating both intelligent and conventional heterogeneous software components. A data warehouse is specifically used to support efficient DSS type query processing and at the same time facilitate the integration of distributed databases. The architecture provides a platform for cooperative problem solving in a complex environment. Implementation issues relating to such an architecture are also addressed.
Andrews, P, Town, RM, Hedley, MJ & Loganathan, P 1996, 'Measurement of plant-available cadmium in New Zealand soils', AUSTRALIAN JOURNAL OF SOIL RESEARCH, vol. 34, no. 3, pp. 441-452.
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Several methods of measuring plant-available cadmium (Cd) were compared using soils that had accumulated Cd under normal New Zealand agricultural practices (low total Cd concentrations, and phosphatic fertiliser as the dominant Cd source). The study encompassed 9 New Zealand soils with different Cd input histories. Cadmium was extracted from these soils by demineralised water, 0.05 M Na2EDTA, l M NH4OAC (pH 7), 0.01 M CaCl2, and 0.05 M CaCl2 and quantified by differential pulse anodic stripping voltammetry (DP-ASV) and graphite furnace atomic absorption spectrophotometry (AAS). The DP-ASV measures the free Cd ion and that associated with labile complexes, but not large organic Cd complexes. Extractable Cd levels were compared with those which are plant-available, as determined by pot studies (lettuce). The 0.01 M CaCl2-extractable Cd measured by AAS and 0.05 M CaCl2-extractable Cd measured by DP-ASV gave the best estimate of plant availability of Cd.
Bawab, S, Kinzel, GL & Waldron, KJ 1996, 'Rectified Synthesis of Six-Bar Mechanisms With Well-Defined Transmission Angles for Four-Position Motion Generation', Journal of Mechanical Design, vol. 118, no. 3, pp. 377-383.
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This paper describes a rectified synthesis method where a rigid body of a six-bar linkage with well-defined transmission angles is guided to pass through four precision positions. The procedure includes the elimination of circuit, branch, and order defects. This is achieved by decomposing the six-bar mechanism into groups of vector pairs called dyads and groups of three vectors called triads. The algebraic method of synthesis can be applied to rectify those chains. Although these defects can be eliminated, it has been a challenging task in the past. The procedure has been implemented for a Watt I crank-driven six-bar linkage in the interactive synthesis package RECSYN.
Bird, TS 1996, 'Cross-coupling between open-ended coaxial radiators', IEE Proceedings - Microwaves, Antennas and Propagation, vol. 143, no. 4, pp. 265-265.
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Bird, TS 1996, 'Improved solution for mode coupling in different-sized circular apertures and its application', IEE Proceedings: Microwaves, Antennas and Propagation, vol. 143, no. 6, pp. 451-464.
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A solution for the mutual admittance between modes in identical circular apertures is extended to the general case of coupling between different-sized apertures. Two alternative representations for the mode coupling integrals are derived. One is a gamma-function series representation with a limited range of application. The other is an improved integral formulation which is better suited to numerical calculation than the original integrals and was obtained by means of an integral transform in the complex plane. The accuracy of this improved integral formulation is demonstrated by comparing computed results with measured data for a three-element test array. Excellent agreement is obtained between theory and experiment for both coupling coefficients and radiation patterns. Results are also presented for an eight-horn feed cluster for a reflector.
Bird, TS 1996, 'Improved solution for mode coupling in different-sized circular apertures and its application', IEE Proceedings - Microwaves, Antennas and Propagation, vol. 143, no. 6, pp. 457-457.
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A solution for the mutual admittance between modes in identical circular apertures is extended to the general case of coupling between different-sized apertures. Two alternative representations for the mode coupling integrals are derived. One is a gamma-function series representation with a limited range of application. The other is an improved integral formulation which is better suited to numerical calculation than the original integrals and was obtained by means,of an integral transform in the complex plane. The accuracy of this improved integral formulation is demonstrated by comparing computed results with measured data for a three-element test array. Excellent agreement is obtained between theory and experiment for both coupling coefficients and radiation patterns. Results are also presented for an eight-horn feed cluster for a reflector. © IEE, 1996.
Bird, TS, Sprey, MA, Greene, KJ & James, GL 1996, 'Design of a high-performance, mid-sized, X-band earth station antenna', Journal of Electrical and Electronics Engineering, Australia, vol. 16, no. 1, pp. 57-63.
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The reflector antenna and feed system of an 11-m diameter earth-station that operates in circular polarisation at X-band is described. The reflector-optics are required to have high G/T, sidelobes that satisfy the CCIR recommendation and low mismatch at the feed. The feed system is required to have high isolation between the transmit and receive ports (> 40 dB) at the centre of the band. This isolation is achieved by minimising reflections from all components forward of the polariser. The measured performance of the reflector and feed system is described.
Boyce, RR, Morton, JW, Houwing, AFP, Mundt, C & Bone, DJ 1996, 'Computational fluid dynamics validation using multiple interferometric views of a hypersonic flowfield', Journal of Spacecraft and Rockets, vol. 33, no. 3, pp. 319-325.
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Brichet, F, Roberts, J, Simonian, A & Veitch, D 1996, 'Heavy traffic analysis of a storage model with long range dependent On/Off sources', Queueing Systems, vol. 23, no. 1-4, pp. 197-215.
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Burnett, IS & Gambino, PMB 1996, 'Pitch detection based on prototype waveforms', Proceedings of the International Symposium on Signal Processing and its Applications, ISSPA, vol. 1, pp. 73-76.
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This paper describes a pitch detection algorithm which builds on the `Composite Autocorrelation' method. By explicitly considering `prototype' waveforms within the constituent autocorrelation computations, and detecting the pitch at frequent (5 ms) intervals, the algorithm produces a robust and continuous pitch track. This leads to a reduced-delay algorithm that overcomes many of the difficulties encountered when using autocorrelation-based techniques in Prototype Waveform (PW) / Waveform Interpolation (WI) coders. In particular, the technique is able to rapidly track the onsets of voiced and unvoiced speech sections. The algorithm is also able to maintain track for both high and low pitch speakers with promising results at this reduced delay.
Burnett, IS & Parry, JJ 1996, 'On the effects of accent and language on low rate speech coders', Proceeding of Fourth International Conference on Spoken Language Processing. ICSLP '96, vol. 1, pp. 291-294.
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Canning, J, Janos, M & Sceats, MG 1996, 'Rayleigh longitudinal profiling of optical resonances within waveguide grating structures using sidescattered light', OPTICS LETTERS, vol. 21, no. 8, pp. 609-611.
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Canning, J, Janos, M, Stepanov, DY & Sceats, MG 1996, 'Direct measurement of grating chirp using resonant side scatter spectra', ELECTRONICS LETTERS, vol. 32, no. 17, pp. 1608-1610.
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Canning, J, Moss, DJ, Faith, M, Leech, P, Kemeny, P, Poulsen, CV & Leistiko, O 1996, 'Ultrastrong UV written gratings in PECVD grown germanosilicate rib waveguides', ELECTRONICS LETTERS, vol. 32, no. 16, pp. 1479-1480.
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Carey, DG, Nguyen, TV, Campbell, LV, Chisholm, DJ & Kelly, P 1996, 'Genetic influences on central abdominal fat: a twin study.', Int J Obes Relat Metab Disord, vol. 20, no. 8, pp. 722-726.
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INTRODUCTION: Recent studies of regional fat distribution have focused on the clinical importance of central abdominal obesity. Central adiposity is strongly related to insulin resistance, non-insulin dependent diabetes mellitus (NIDDM), dyslipidaemia and cardiovascular disease. While significant genetic influences on body mass index (BMI), total body and subcutaneous fat have been demonstrated, the inheritance of central abdominal obesity, has not been studied. OBJECTIVE: To assess genetic effects on regional fat distribution and associated metabolic parameters. DESIGN AND SUBJECTS: We directly measured total body, central abdominal (C-abd) and non-abdominal fat using dual energy X-ray absorptiometry in 50 monozygotic (MZ) and 36 dizygotic (DZ) female twins, of age (mean +/- SD), 44 +/- 12 and 47 +/- 14 y; BMI 24 +/- 5 and 24 +/- 3 kg/m2; C-abd fat 33 +/- 9 and 32 +/- 9%, respectively. Total variance in all parameters was independent of zygosity and genetic analyses of regional adiposity were performed before and after adjusting for age and percentage total body fat. RESULTS: A genetic influence was observed on the population variance in total fat, C-abd fat (C-abd fat rMZ = 0.66 vs rDZ = 0.20, p = 0.03) and non abdominal fat. After adjusting C-abd fat for age and total body fat there was a independent genetic influence on C-abd fat accounting for approximately 70% of the population variance (rMZ = 0.61 vs rDZ = 0.40, p = 0.001). CONCLUSION: The majority of inter-subject variance in central abdominal fat in non-obese individuals is due to genetic factors. The inheritance of abdominal obesity, with its associated metabolic consequences, may contribute to the familial aggregation of insulin resistance, diabetes and cardiovascular disease.
Chang, J, Tsai, LJ & Vigneswaran, S 1996, 'Experimental investigation of the effect of particle size distribution of suspended particles on microfiltration', Water Science and Technology, vol. 34, no. 9, pp. 133-140.
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Suspended particle size is one of the main factors which affect the performance of the microfiltration. Experimental results with bi and trimodal suspensions of latex particles clearly showed that the permeate flux and the quality were significantly affected by the particle size and its distribution, especially when the particle size was smaller than the pore size of the membrane.
Chang, JS, Tsai, LJ & Vigneswaran, S 1996, 'Experimental investigation of the effect of particle size distribution of suspended particles on microfiltration', Water Science and Technology, vol. 34, no. 9, pp. 133-140.
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Suspended particle size is one of the main factors which affect the performance of the microfiltration. Experimental results with bi and trimodal suspensions of latex particles clearly showed that the permeate flux and the quality were significantly affected by the particle size and its distribution, especially when the particle size was smaller than the pore size of the membrane.
Cheng-Jian Lin & Chin-Teng Lin 1996, 'Reinforcement learning for an ART-based fuzzy adaptive learning control network', IEEE Transactions on Neural Networks, vol. 7, no. 3, pp. 709-731.
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Dubeau, F & Shannon, AG 1996, 'A Fibonacci model of infectious disease', FIBONACCI QUARTERLY, vol. 34, no. 3, pp. 257-270.
Eigenbrod, KD, Knutsson, S & Sheng, D 1996, 'Pore-Water Pressures in Freezing and Thawing Fine-Grained Soils', Journal of Cold Regions Engineering, vol. 10, no. 2, pp. 77-92.
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Esteban, L & Hoang, D 1996, 'The connection array for image summarisation', Mathematics and Computers in Simulation, vol. 41, no. 1-2, pp. 75-86.
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The connection array is a very dense and very fast summarisation of a bitmap. The data structure contains information that is useful for classification, recognition and image searching. It is calculated during the image production stage of a recognition system and holds the following information for objects in a scene: object shape, containment, relative placement, and numerical data like area and perimeter. The connection array is an efficient structure for storing object features and it is effective in all stages of a recognition process.
Finn, GD, Lister, R, Szabo, T, Simonetta, D, Mulder, H & Young, R 1996, 'Neural networks applied to a large biological database to analyse dairy breeding patterns', Neural Computing & Applications, vol. 4, no. 4, pp. 237-253.
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The paper recounts the investigation of a dairy sire prediction capability based on Cascade Correlation neural networks to study influences relating the performance of offspring to their parents. The context of the problem is the artificial insemination breeding program for the Australian dairy industry. The networks are used to screen observed information in the database to relate it to best combinations of dam and sire. The voluminous data is quite noisy and is subject to genetic and environmental influences. The intention is to extract linear and nonlinear relationships from among the input variables without specifying their form. A number of scenarios are employed which recast the data into different forms. In particular, it was discovered that the problem could be restructured and the data supplemented with transformed data to produce succinct input patterns of manageable dimensionality, which allowed for a substantially improved predictive capability. It was then found that reasonable daughter predictions could be obtained of about 10%, as measured by her milk production. Results are compared with those obtained using two alternate neural network methods. Crude statistical methods are employed to evaluate the performance of the neural networks.
Funaki, K, Miyanaga, Y & Tochinai, K 1996, 'A time-varying ARMAX speech analysis method based on the glottal source model', The Journal of the Acoustical Society of America, vol. 100, no. 4_Supplement, pp. 2602-2602.
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Human speech production is usually modeled by an AR process with an impulse or white Gauss process input, such as in LPC analysis. But it is well known that a vocal tract feature provides an antiformant in addition to a formant frequency, and a voiced source of human speech contains a glottal source as well as noise characteristics. In order to represent speech production efficiently, a time-varying ARMAX (ARMA with eXogeneous input) model with a glottal source model is introduced. This model provides two MA processes, one for the white Gauss input and the other for the exogeneous input, which is generated by the glottal source model. A new speech analysis method is proposed that is based on the speech production model to extract speech characteristics accurately. In the proposed method, the Rosenberg–Klatt (RK) model [Klatt et al., J. Acoust. Soc. Am. 87, 820–857 (1990)] is adopted to generate a glottal wave. The glottal source and ARMAX parameters are estimated pitch synchronously and simultaneously, so as to optimize error criterion jointly by using an adaptive MIS method [Miyanaga et al., IEEE Trans. Acoust. Speech Signal Process. ASSP-34, 423–433] in ARMAX identification. Experiments have already been conducted using synthetic speech, which is generated by an ARMAX process with the RK model glottal source and a white Gauss input. The experimental result shows that the proposed method makes it possible to estimate accurate vocal tract and voice source characteristics (such as open quotient) from the speech signal.
Furukawa, T, Rye, DC, Dissanayake, MWMG & Barratt, AJ 1996, 'Automated polishing of an unknown three-dimensional surface', Robotics and Computer-Integrated Manufacturing, vol. 12, no. 3, pp. 261-270.
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Gambino, PMB & Burnett, IS 1996, 'Low delay pitch detection using dynamic-programming/Viterbi techniques', Proceedings of the International Symposium on Signal Processing and its Applications, ISSPA, vol. 1, pp. 77-80.
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An algorithm for the detection of the Fundamental Pitch Period (F 0) at low delay, utilizing Dynamic Programming (DP) Techniques and those of the Viterbi Algorithm (VA) is presented. The algorithm results in a low delay, accurate pitch detector which is vital for low rate speech coders, such as those utilizing Prototype Waveform Interpolation (PWI) techniques. Current methods, based on autocorrelation incur a significant look-ahead delay and are therefore considered unsuitable for use in such speech coders. The algorithm described uses improved, non-linear Pitch Detection, with a substantial extension of a Viterbi-type tracking algorithm to maintain a smooth pitch track.
Glover, BM, Ishizuka, Y, Jeyakumar, V & Tuan, HD 1996, 'Complete Characterizations of Global Optimality for Problems Involving the Pointwise Minimum of Sublinear Functions', SIAM Journal on Optimization, vol. 6, no. 2, pp. 362-372.
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Necessary and sufficient global optimality conditions are presented for certain nonconvex minimization problems subject to inequality constraints that are expressed as the pointwise minimum of sublinear (MSL) functions. A generalized Farkas lemma for ine
Guan, L 1996, 'Adaptive scaled mean square error filtering by neural networks', Journal of Electronic Imaging, vol. 5, no. 4, pp. 460-460.
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Guo, YJ, Paez, A, Sadeghzadeh, RA & Barton, SK 1996, 'A patch antenna for HIPERLAN', Wireless Personal Communications, vol. 3, no. 4, pp. 389-396.
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A patch antenna suited for indoor HIPERLAN is presented. The antenna operates in T M 02 mode and its radiation pattern is omnidirectional in azimuth and has a null in the normal direction. An experimental prototype has been designed and tested. A 6.1 % bandwidth of VSWR ≤ 2 and 4.2 dB antenna gain were measured at 5 GHz band. © 1996 Kluwer Academic Publishers.
Gurung, SR, Stewart, RB, Loganathan, P & Gregg, PEH 1996, 'Aluminium-organic matter-fluoride interactions during soil development in oxidised mine waste', SOIL TECHNOLOGY, vol. 9, no. 4, pp. 273-279.
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A three year field trial assessing the suitability of mine waste rock as a surrogate subsoil with different depths of topsoil showed that pasture yield was significantly lower in the unmodified waste rock (UWR) treatments compared to waste rock modified with lime and potassic superphosphate (MWR) during the first two years but there was no difference in yield in the third year between the waste rock treatments. The reduced yield in UWR during the first two years was considered to be due to phytotoxic levels of aluminium (Al) in the UWR soil solution. Soil samples from the waste rock interface (A) and waste rock at depth ≤ 300 mm (B) collected at the end of the three year trial were analysed for different forms of soil Al, total soluble fluoride (F), dissolved organic carbon (DOC) and soil pH to determine whether organic matter and F leachate from the topsoil reduced Al toxicity at the waste rock interface (A) during soil development over 3 years. Results showed that after 3 years, 0.02 M CaCl2 extractable Al (Al(Ca)) and 1 M KCl extractable exchangeable + soluble Al (Al(K)) were effectively reduced in the MWR interface (A) by lime and fertiliser applications but they remained at very high phytotoxic levels (Al(Ca) = 17-21 μg g-1, Al(K)=261-339 μg g-1) in the UWR interface (A) irrespective of topsoil depth treatment. The corresponding organic bound Al (Al(OM)) ranged from 200 to 214 μg g-1 and DOC was in the range 169-203 μg g-1 in both UWR and MWR interfaces (A). These values were a significant two-fold higher than the values at depth ≤300 mm (B) which were considered to be the original levels of Al(OM) and DOC in UWR. The increase in Al(OM) and DOC by the third year is probably due to progressive leaching of organic ligands produced from the decomposition of organic matter in the topsoil subject to an annual rainfall of 2500 mm. This evidence for the reduction in Al toxicity by organic matter is further supported by significant dry root density (DRD) in the UWR ...
Ha, QP 1996, 'Proportional-integral controllers with fuzzy tuning', ELECTRONICS LETTERS, vol. 32, no. 11, pp. 1043-1044.
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Some simple fuzzy logic schemes for online tuning of proportional-integral controller parameters to improve system robustness are outlined. Simulation results indicate that, with fuzzy tuning, the reference response is well damped with adequately fast dynamics, and the maximum deviation of the disturbance response is reduced even in the case of changing plant parameters.
Ha, QP 1996, 'Robust sliding mode controller with fuzzy tuning', ELECTRONICS LETTERS, vol. 32, no. 17, pp. 1626-1628.
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A new technique is presented for linearised systems with uncertainties using sliding mode control with fuzzy tuning. The validity of the proposed approach is verified by the control of a two-mass servo-system.
Hawryszkiewycz, IT, Maciaszek, LA & Getta, JR 1996, 'Coordination and artifact semantics in asynchronous distributed cooperation', Journal of Systems and Software, vol. 33, no. 2, pp. 179-188.
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The trend towards an information-based society calls for computers to assist people to collaborate across time and space. Such collaboration is now frequently needed to bring expertise together to develop artifacts such as documents, project plans, or ot
Heiber, M, Marchese, A, Nguyen, T, Heng, HHQ, George, SR & O'Dowd, BF 1996, 'A Novel Human Gene Encoding a G-Protein-Coupled Receptor (GPR15) Is Located on Chromosome 3', Genomics, vol. 32, no. 3, pp. 462-465.
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We used sequence similarities among G-protein-coupled receptor genes to discover a novel receptor gene. Using primers based on conserved regions of the opioid-related receptors, we isolated a PCR product that was used to locate the full-length coding region of a novel human receptor gene, which we have named GPR15. A comparison of the amino acid sequence of the receptor encoded by GPR15 with other receptors revealed that it shared sequence identity with the angiotensin II AT1 and AT2 receptors, the interleukin 8b receptor, and the orphan receptors GPR1 and AGTL1. GPR15 was mapped to human chromosome 3q11.2-q13.1.
Hoffman, DM, Crampton, L, Sernia, C, Nguyen, TV & Ho, KK 1996, 'Short-term growth hormone (GH) treatment of GH-deficient adults increases body sodium and extracellular water, but not blood pressure.', J Clin Endocrinol Metab, vol. 81, no. 3, pp. 1123-1128.
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Initiation of GH treatment in adults is frequently complicated by the development of symptomatic fluid retention. To investigate the mechanism and extent of fluid retention that occurs with dosages of GH used in the treatment of GH-deficient adults, we conducted a double blind study in which seven GH-deficient patients (aged 24-74 yr) each received in random order daily sc injections of placebo, a physiological dose of GH (0.04 U/kg, low dose), and a supraphysiological dose of GH (0.08 U/kg, high dose) for 7 days, separated by 21-day washout periods. On the seventh day, measurements were made of serum insulin-like growth factor I, body weight, exchangeable sodium, plasma volume, angiotensinogen, PRA, aldosterone, atrial natriuretic peptide (ANP), and mean 24-h ambulatory heart rate and blood pressure. GH significantly increased mean insulin-like growth factor I levels from 105 +/- 11 to 304 +/- 45 micrograms/L during low dose treatment (P = 0.006) and 400 +/- 76 micrograms/L during high dose treatment (P = 0.004). High dose GH caused a 1.2 +/- 0.3 kg increase in body weight (P = 0.01) and a 193 +/- 65 mmol increase in exchangeable sodium (P = 0.008). Low dose GH had a lesser effect, with no significant increase in body weight, but an increase in exchangeable sodium of 113 +/- 37 mmol (P = 0.02). Plasma volume was not significantly affected by GH treatment. Mean supine angiotensinogen levels were significantly higher during both GH treatments compared to placebo (low dose, P = 0.017; high dose, P = 0.028) as were mean supine PRA levels (low dose, P = 0.0002; high dose, P = 0.0025). Supine angiotensin II, aldosterone, and ANP levels were not significantly affected by GH treatment. There was no significant change from placebo in any of the sodium-regulating hormones in the erect posture. The mean 24-h heart rate was significantly higher during low dose (82 +/- 2 beats/min; P = 0.0001) and high dose (88 +/- 3 beats/min; P = 0.0001) GH treatment than during placebo (6...
Hui, SYR, Zhu, JG & Ramsden, VS 1996, 'A generalized dynamic circuit model of magnetic cores for low- and high-frequency applications .2. Circuit model formulation and implementation', IEEE TRANSACTIONS ON POWER ELECTRONICS, vol. 11, no. 2, pp. 251-259.
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This paper describes the formulation and implementation of a generalized dynamic magnetic core circuit model suitable for both low- and high-frequency applications. The behavior of magnetic cores with any arbitrary flux waveforms is modeled by a simple l
Imai, H, Miyanaga, Y & Tochinai, K 1996, 'Nonlinear spectrum estimation using a new neural network with a level estimator', The Journal of the Acoustical Society of America, vol. 100, no. 4_Supplement, pp. 2575-2575.
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This paper proposes a new nonlinear signal processing by using a three-layered network which is trained with self-organized clustering and supervised learning. The network consists of three layers, i.e., a self-organized layer, an evaluation layer, and an output layer. Since the evaluation layer is designed as a simple perceptron network and the output layer is designed as the fixed weight linear nodes, the training complexity is the same as the self-organized clustering and a simple perceptron network. In other words, quite high speed training can be realized. Generally speaking, since the data range usually used in signal processing is arbitrarily large, the network output should also cover this range. However, it may be difficult for only one node in the network to output these data. Instead of this technique, if this dynamic range is covered by using several nodes, the complexity of each node is reduced and the associated range is also quite limited. This results in a higher performance of this network than the conventional ones. As one of the objectives, this paper introduces the spectrum envelope estimation of speech waveforms. It is shown that accurate spectrum envelopes can be obtained.
Indraratna, B 1996, 'Utilization of lime, slag and fly ash for improvement of a colluvial soil in New South Wales, Australia', Geotechnical & Geological Engineering, vol. 14, no. 3, pp. 169-191.
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In Australia, colluvial soils form large terrains which are often subjected to considerable erosion and mass movement. This study presents a laboratory evaluation of the improvement effected by hydrated lime, milled blast furnace slag and fly ash on a fine grained (erosive) colluvial soil in New South Wales, Australia. Geotechnical tests were conducted to determine the compaction and consolidation characteristics and the compressive and shear strength properties of the blended and natural soil specimens. The effect of these additives on the Atterberg limits and pH levels is also investigated. As large amounts of fly ash and steel slag are produced in New South Wales, it is economically attractive to utilize these industrial by-products for ground improvement rather than employing conventional methods such as lime treatment. This study demonstrates that for the colluvial soil tested, milled slag is the most effective in terms of improving the internal friction angle of the treated soil, while lime is the most suitable for achieving the optimum compressive strength. Non-pozzolanic fly ash is found to be inappropriate as a soil improving agent. The cost of ground treatment using the various additives is also estimated and compared. © 1996 Chapman & Hall.
Indraratna, B & Lasek, G 1996, 'Laboratory evaluation of the load-deflection behaviour of clay beams reinforced with galvanised wire netting', Geotextiles and Geomembranes, vol. 14, no. 10, pp. 555-573.
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In Australia the utilisation of clay in the construction of landfill liners has recently come under criticism either due to the difficulty in reproducing the laboratory results on site, or because of the potential for cracking of the compacted liner after construction. Realising that clay is weak in tension and given the possibility of certain areas of the liner being subjected to flexure, a testing program was undertaken to determine the effects of placement (compaction), moisture content and internal reinforcement on the potential failure of clay liners. In particular, this paper discusses the load carrying capacity and deformation sustained by compacted clay beams in flexure, and the improvement gained through the introduction of an economical reinforcement in the form of galvanised steel wire netting. Results obtained by flexural bending tests are discussed in detail, and the extent of improvement provided by galvanised wire netting is evaluated. © 1997 Elsevier Science Ltd. All rights reserved.
INDRARATNA, B, DILEMA, ELG & VAFAI, F 1996, 'AN EXPERIMENTAL STUDY OF THE FILTRATION OF A LATERITIC CLAY SLURRY BY SAND FILTERS.', Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, vol. 119, no. 2, pp. 75-83.
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In many parts of the world, residual soils are used for the construction of impervious dam cores. This paper discusses the experimental details and design aspects of sand filters in the retention of a range of particle sizes in a clay slurry. Lateritic residual soil has a propensity to crack at relatively small tensile strains, if compacted either at low moisture content or at energy levels greater than the standard Proctor method. From laboratory results, a distinct demarcation between effective and noneffective filters was identified in considering the filter permeability and a specific particle size of the base soil (clay floes) retained by the filter. The equivalent of specific grain size <5g5, determined by hydrometer analysis was considered as the reference base particle, and the cation concentration of the base soil slurry was taken to represent the typical reservoir water chemistry of several dams in Thailand. The permeability of the filter was examined as a function of the sand grain sizes and the resulting empirical relationships are given in the paper. The performance of granular filters, including clogging behaviour, has'been studied according to~the particle sizes and uniformity coefficients of the filter media. The applicability of the proposed empirical relationships in practice is discussed in contrast to the conventional filter criteria.
Ishizuka, Y & Tuan, HD 1996, 'Directionally differentiable multiobjective optimization involving discrete inclusions', Journal of Optimization Theory and Applications, vol. 88, no. 3, pp. 585-616.
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Jacobs, M & Leydekkers, P 1996, 'Specification of synchronization in multimedia conferencing services using the TINA lifecycle model.', Distributed Syst. Eng., vol. 3, no. 3, pp. 185-196.
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Multimedia conferencing services have specific performance requirements with respect to the exchange of continuous media. One of these requirements is the synchronization within and between related streams. This article identifies synchronization requirements and solutions relevant for conferencing services that operate in an open distributed environment as defined in TINA-C. Based on the TINA service lifecycle, synchronization requirements and policies are described from different stakeholder perspectives. Synchronization is then specified in detail using the TINA information, computational and engineering languages. Finally, a description of the implementation of synchronization for a multimedia conferencing service is provided using a DPE platform. The synchronization object is proposed as an additional component available for the DPE that needs to deal with real-time audio-visual streams.
Janos, M, Canning, J & Sceats, MG 1996, 'Incoherent scattering losses in optical fiber Bragg gratings', OPTICS LETTERS, vol. 21, no. 22, pp. 1827-1829.
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Janos, M, Canning, J & Sceats, MG 1996, 'Transient transmission notches induced in Er3+ doped optical fibre Bragg gratings', ELECTRONICS LETTERS, vol. 32, no. 3, pp. 245-246.
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Jones, G, White, C, Nguyen, T, Sambrook, PN, Kelly, PJ & Eisman, JA 1996, 'Prevalent vertebral deformities: Relationship to bone mineral density and spinal osteophytosis in elderly men and women', Osteoporosis International, vol. 6, no. 3, pp. 233-239.
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Juang, CF & Lin, CT 1996, 'Self-organizing neural fuzzy inference network for indentification and control', Journal of Control Systems and Technology, vol. 4, no. 4, pp. 269-280.
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A Self-Organizing Neural Fuzzy Inference Network (SONFIN) with on-line learning ability is proposed in this paper. The SONFIN in inherently a fuzzy rule-based model possessing neural network's learning ability. In contrast to the general adaptive neural fuzzy networks, where the rules should be decided in advance before parameter learning is performed, there are no rules initially in the SONFIN. They are created and adapted as on-line learning proceeds via simultaneous structure and parameter identification. In this structure identification of the precondition part, the input space is partitioned in a flexible way according to an aligned clustering-based algorithm. As to the structure identification of the consequent part, only a singleton value selected by a clustering method is assigned to each rule initially. Afterwards, some additional terms (a linear combination of input variables) are added to the consequent part when necessary. Furthermore, to enhance the knowledge representation ability of the SONFIN, a linear transformation for each input variable can be incorporated into the network so that much fewer rules are needed or higher accuracy can be achieved. Proper linear transformation are also learned dynamically in the parameter identification phase of the SONFIN. To demonstrate the capability of the proposed SONFIN, simulations in identification and control problems are done. Effectiveness of the SONFIN is verified from these simulations.
Keen, RW, Nguyen, T, Sobnack, R, Perry, LA, Thompson, PW & Spector, TD 1996, 'Can biochemical markers predict bone loss at the hip and spine?: A 4-year prospective study of 141 early postmenopausal women', Osteoporosis International, vol. 6, no. 5, pp. 399-406.
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Kolakowski, LF, Jung, BP, Nguyen, T, Johnson, MP, Lynch, KR, Cheng, R, Heng, HHQ, George, SR & O'Dowd, BF 1996, 'Characterization of a human gene related to genes encoding somatostatin receptors', FEBS Letters, vol. 398, no. 2-3, pp. 253-258.
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We report the identification of a gene, named SLC-1, encoding a novel G protein-coupled receptor (GPCR). A customized search procedure of a database of expressed sequence tags (dbEST) retrieved a human cDNA sequence that partially encoded a GPCR. A genomic DNA fragment identical to the cDNA was obtained and used to screen a library to isolate the full-length coding region of the gene. This gene was intronless in its open reading frame, and encoded a receptor of 402 amino acids, and shared -40% amino acid identity in the transmembrane (TM) regions to the five known human somatostatin receptors. Northern blot analysis revealed that SLC-1 is expressed in human brain regions, including the forebrain and hypothalamus. Expression in the rat was highest in brain, followed by heart, kidney, and ovary. Expression of SLC-1 in COS-7 cells failed to show specific binding to radiolabelled Tyr1-somatostatin-14, naloxone, bremazocine, 1,3-di(2-tolyl)guanidine (DTG), or haloperidol. A repeat polymorphism of the form (CA)(n) was discovered in the 5'-untranslated region (UTR) of the gene and SLC-1 was mapped to chromosome 22, q13.3.
Kondo, M, Miyanaga, Y & Tochinai, K 1996, 'Dynamic network for identification of character locations using self-organized clustering', Electronics and Communications in Japan (Part III: Fundamental Electronic Science), vol. 79, no. 7, pp. 11-21.
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Lam, S, Shen, Y, Nguyen, T, Messier, TL, Brann, M, Comings, D, George, SR & O'Dowd, BF 1996, 'A Serotonin Receptor Gene (5HT1A) Variant Found in a Tourette's Syndrome Patient', Biochemical and Biophysical Research Communications, vol. 219, no. 3, pp. 853-858.
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Serotonergic pathway disturbances have been implicated in neuropsychiatric disorders such as Tourette's syndrome (TS), substance abuse, and depression. In order to search for the presence of an association between these neuropsychiatric disorders and particular serotonin receptors isolated from these patients, we have started to analyze the structure of these receptor genes. We now report that a missense nucleotide change in the 5HT1A receptor gene produces a variant form of the 5HT1A receptor (Arg219 to Leu) identified in DNA extracted from a TS patient. Also, in several DNA samples examined, both in controls and in the patients, we found a second missense nucleotide change which resulted in an amino acid change (Asn417 to Lys) located in the carboxyl tail of the receptor. Several other polymorphic changes have been reported previously in the human 5HT1A receptor and we have also confirmed these findings in our samples.
Lee, S, Vigneswaran, S & Bajracharya, K 1996, 'Phosphorus transport in saturated slag columns: Experiments and mathematical models', Water Science and Technology, vol. 34, no. 1-2, pp. 153-160.
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Excessive phosphorus (P as orthophosphate) is one of the major pollutants in natural water that are responsible for algal blooms and eutrophication. P removal by slag is an attractive solution if the P sorption capacity of slag is significant. To design an efficient land treatment facility, basic information on the behaviour of P in the media-water environment is required. In this study, detailed column experiments were conducted to study the P transport under dynamic condition, and mathematical models were developed to describe this process. The column experiments conducted with dust and cake waste products (slag) from a steel industry as adsorbing media indicated that they had higher sorption capacity of P than that of a sandy loam soil from North Sydney, Australia. P transport in the dust and cake columns exhibited characteristic S-shaped or curvilinear breakthrough curves. The simulated results from a dynamic physical non-equilibrium sorption model (DPNSM) and Freundlich isotherm constants satisfactorily matched the corresponding experimental breakthrough data. The mobility of P is restricted by the adsorbents and it is proportional to the sorption capacity of them.
Li, JY & Chow, TWS 1996, 'Functional Approximation of Higher-Order Neural Networks', Journal of Intelligent Systems, vol. 6, no. 3-4, pp. 239-260.
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Li, Y, Miyanaga, Y & Tochinai, K 1996, 'Memorizing and regenerating spatiotemporal patterns with a structured recurrent neural network', Electronics and Communications in Japan (Part III: Fundamental Electronic Science), vol. 79, no. 8, pp. 65-73.
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LIN, C-T 1996, 'Adaptive subset hood for neural fuzzy control', International Journal of Systems Science, vol. 27, no. 10, pp. 937-955.
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LIN, C-T, KAN, M-C & CHUNG, I-F 1996, 'A NEURAL NETWORK THAT LEARNS FROM FUZZY DATA FOR LANGUAGE ACQUISITION', International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems, vol. 04, no. 06, pp. 581-603.
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This paper proposes a four-layered fuzzy language acquisition network (FLAN) for acquiring fuzzy language. It can catch the intended information from a sentence (command) spoken in natural language with fuzzy terms. The intended information includes a meaningful semantic action and the fuzzy linguistic information of that action (for example, the phrase “move forward” represents the meaningful semantic action and the phrase “very high speed” represents the linguistic information in the fuzzy command “Move forward in a very high speed.”). The proposed FLAN has two important features. First, we can make no restrictions whatever on the fuzzy language input which is used to specify the desired information, and the network requires no acoustic, prosodic, grammar and syntactic structure. Second, the linguistic information of an action is learned automatically and it is represented by fuzzy numbers based on α-level sets. A supervised learning scheme is proposed to train the FLAN on fuzzy training data. This learning scheme consists of the mutual-information (MI) supervised learning algorithm for learning meaningful semantic actions, and the fuzzy backpropagation (FBP) learning algorithm for learning linguistic information. An experimental system is constructed to illustrate the performance and applicability of the proposed FLAN.
Lippman, A & Kermode, R 1996, 'Media Banks: Entertainment and the Internet', IBM Systems Journal, vol. 35, no. 3.4, pp. 272-291.
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Liu, ZM, Mohan, AS & Aubrey, TA 1996, 'Em scattering using nonuniform mesh fdtd, pml and mur's abc', Electromagnetics, vol. 16, no. 4, pp. 341-358.
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In this paper, techniques are presented to extend FDTD, PML and Mur's second order ABC to the non-uniform mesh case for scattering problems from a consideration of improving the efficiency of computer codes to run on parallel computers. An alternative method to obtain the space derivatives in non-uniform mesh FDTD and non-uniform mesh PML ABC is presented which provides a second order accuracy. Mur's second order ABC has also been extended to the non-uniform mesh case with a First order accuracy which is an improvement over an existing method. A method of extending the pure scattered-field formulation to the PML medium is described. The electric fields inside a single layer dielectric sphere as well as a three layer dielectric sphere illuminated by a sinusoidal uniform plane wave have been computed which compare well with the results from an exact formulation. © 1996 Taylor & Francis.
Liu, ZM, Mohan, AS & Aubrey, TA 1996, 'EM Scattering Using Nonuniform Mesh FDTD, PML and Mur's ABC', Electromagnetics, vol. 16, no. 4, pp. 341-358.
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In this paper, techniques are presented to extend FDTD, PML and Murs second order ABC to the non-uniform mesh case for scattering problems from a consideration of improving the efficiency of computer codes to run on parallel computers. An alternative met
Loganathan, P, Hedley, MJ, Gregg, PEH & Currie, LD 1996, 'Effect of phosphate fertiliser type on the accumulation and plant availability of cadmium in grassland soils', NUTRIENT CYCLING IN AGROECOSYSTEMS, vol. 46, no. 3, pp. 169-178.
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Cadmium (Cd), a potentially toxic heavy metal for humans and animals, accumulates in the liver and kidneys of older animals grazing New Zealand and Australian pastoral soils. Phosphorus (P) fertiliser is the major input of Cd into these farming systems. A study was conducted to evaluate the effects, over 10 years, of annual application (30 kg P ha-1 yr-1) of four forms of P fertilisers having different solubilities and Cd contents [41, 32, 10 and 5 μg Cd g-1 for North Carolina phosphate rock (NCPR), single superphosphate (SSP), diammonium phosphate (DAP) made from low Cd phosphate rocks and Jordan phosphate rock (JPR) respectively] on soil and herbage Cd concentrations. Ten years of fertiliser application caused a marked increase in surface soil Cd concentrations. Total soil Cd was significantly higher in SSP and NCPR treatments compared to control (no P fertiliser), JPR and DAP treatments in the 0-30 and 30-75 mm soil depths. Plant-available Cd (0.01 M CaCl2 extractable Cd) was higher in SSP treatments than in control and other fertiliser treatments. Chemical analysis of herbage samples showed that there was no significant difference in Cd concentration in pasture grasses between treatments in the second year of the trial but in the eighth and tenth year, plots fertilised with SSP and NCPR had significantly higher Cd in pasture grasses in most of the seasonal cuts compared to control, JPR and DAP. Cadmium recovery by both grasses and clover was less than 5% of Cd applied in fertiliser. Clover Cd concentration and yield were much lower than those for grass and therefore its contribution to pasture Cd uptake was very low (< 7%). A strong seasonal effect on grass Cd concentration, which is inversely related to pasture growth rate, was observed in all three sampling years - Cd concentration was highest during autumn and lowest in spring. Total Cd contents of the fertilisers and their rate of dissolution rather than soil pH [pH (H2O) at 30-75 mm depth of 5.39, 5.20, ...
Manoharan, V, Loganathan, P, Parfitt, RL & Tillman, RW 1996, 'Changes in soil solution composition and aluminium speciation under legume-based pastures in response to long-term phosphate fertiliser applications', AUSTRALIAN JOURNAL OF SOIL RESEARCH, vol. 34, no. 6, pp. 985-998.
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This study describes some of the effects of 8 years of annual application of 6 types of phosphatic fertilisers on the chemical composition and aluminium (Al) speciation in soil solution extracted from a soil under pasture. Soil samples at 2 depths, 0-30 and 30-75 mm, were collected at the end of 8 years. Soil solutions were extracted by centrifuging at 12 000 RCF and analysed for Al, Na, K, Ca, Mg, F, NO3, Cl, and SO4, as well as pH and ionic strength. Soil and soil solution pH were significantly increased at both depths by application of North Carolina phosphate rock (NCPR) compared with the control. In contrast, diammonium phosphate (DAP) significantly decreased the soil and solution pH. Single superphosphate (SSP) did not have any significant effect on soil or solution pH compared with the untreated control. The surface soil (0-30 mm) solution pH was on average 0.6 of a unit higher than the subsurface soil (30-75 mm) solution pH. Total monomeric Al concentration [Al], measured by the pyrocatecol violet (PCV; 4 min) method, ranged from 1.5 to 4.8 μM in the surface soil and 2.5 to 12.2 μM in the subsurface soil. The DAP and higher rates of SSP application resulted in a large increase in total and inorganic monomeric [Al] in the soil solution extracted from the subsurface soil. Total soluble [F] ranged from 2.7 to 23.5 μM and 3.2 to 25.6 μM in the surface and subsurface soils, respectively, and was significantly increased by the application of NCPR and by higher rates of SSP. The predominant forms of inorganic monomeric Al present in the soil solution were estimated to be the non-phytotoxic Al-F complexes, AIF2+, and AIF2/+. There was a marked decrease in toxic Al species (Al3+, Al(OH)2+, Al(OH)2/+) in soil solution following NCPR and SSP application. This was due primarily to complexation of Al with F derived from these fertilisers forming non-toxic Al-F complexes. The results suggest that the long-term application of reactive phosphate rock such as NCPR may con...
Manoharan, V, Loganathan, P, Tillman, RW & Parfitt, RL 1996, 'Assessing aluminum phytotoxicity in long-term phosphate fertilized pasture soils', COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS, vol. 27, no. 5-8, pp. 1731-1748.
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Miyanaga, Y & Tochinai, K 1996, 'High-speed and high-accuracy learning using a self-organization network and a supervised network', Electronics and Communications in Japan (Part III: Fundamental Electronic Science), vol. 79, no. 7, pp. 41-50.
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Nakagaki, A, Shibata, K, Miyanaga, Y & Tochinai, K 1996, 'Adaptive spectrum estimation considering the time variation in analysis intervals', Electronics and Communications in Japan (Part III: Fundamental Electronic Science), vol. 79, no. 12, pp. 38-47.
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Ngo, HH & Vigneswaran, S 1996, 'Application of downflow floating medium flocculator/prefilter (DFF) - coarse sand filter (CSF) in nutrient removal', Water Science and Technology, vol. 33, no. 8, pp. 63-70.
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In this study, the applicability and the advantages of the downflow floating medium filter (DFF) in wastewater treatment were examined. The experimental results indicated that the DFF with in-line flocculation addition is a good pretreatment unit to reduce phosphorus load (up to 80-89% removal). The DFF also resulted in uniform filterable-flocs of 32-42 µm throughout the filter run. Thus it can also successfully be used as a flocculator. The backwashing of floating medium was achieved with a small quantity of water and at low backwash velocity. The introduction of floating medium filter bed on top of a coarse sand filter unit (CSF) increased the filter run time and removal efficiency (more than 87 and 94% of NH3-N and T-P removal respectively), particularly at a low filtration rate (5 m3/m2.h).
Ngo, HH & Vigneswaran, S 1996, 'Application of downflow floating medium flocculator/prefilter (DFF) - Coarse sand filter (CSF) in nutrient removal', WATER SCIENCE AND TECHNOLOGY, vol. 33, no. 8, pp. 63-70.
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In this study, the applicability and the advantages of the downflow floating medium filter (DFF) in wastewater treatment were examined. The experimental results indicated that the DFF with in-line fiocculation addition is a good pretreatment unit to reduce phosphorus load (up to 80â89% removal). The DFF also resulted in uniform filterable-floes of 32â42 (am throughout the filter run. Thus it can also successfully be used as a flocculator. The backwashing of floating medium was achieved with a small quantity of water and at low backwash velocity. The introduction of floating medium filter bed on top of a coarse sand filter unit (CSF) increased the filter run time and removal efficiency (more than 87 and 94% of NH3-N and T-P removal respectively), particularly at a low filtration rate (5 m3/m2.h).
Ngo, HH, Vigneswaran, S & Jegatheesan, V 1996, 'Mathematical modelling of downflow floating medium filter (DFF) with in-line flocculation arrangement', WATER SCIENCE AND TECHNOLOGY, vol. 34, no. 3-4, pp. 355-362.
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A laboratory-scale set-up consisting of rapid mixing device and floating medium filter was used to study the use of a downflow floating medium filter (DFF) with an in-line flocculation arrangement as a static flocculator and a prefilter. The semi-empirical mathematical model formulated incorporates flocculation within the filter, particle/floc attachment onto the filter and the detachment of flocs from the medium. The mathematical model for filtration takes into account the expansion of the filter bed. The removal efficiency of DFF and headloss development were successfully simulated for different conditions of filtration velocity, filter depth and influent suspended solids (SS). The values of attachment coefficient ap and headloss coefficient were found to be independent of filtration velocity, filter depth and influent SS concentration.
Ngugyen, TV, Eisman, JA, Kelly, PJ & Sambroak, PN 1996, 'Risk Factors for Osteoporotic Fractures in Elderly Men', American Journal of Epidemiology, vol. 144, no. 3, pp. 255-263.
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Nguyen, HT, Luzio, SD, Dolben, J, West, J, Beck, L, Coates, PA & Owens, DR 1996, 'Dominant risk factors for retinopathy at clinical diagnosis in patients with type II diabetes mellitus', Journal of Diabetes and its Complications, vol. 10, no. 4, pp. 211-219.
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A study of 270 newly presenting, previously untreated, type II diabetic patents revealed that 38 patients (14%) had already developed diabetic retinopathy (DR). Among this group, 26 patients had lesions of background diabetic retinopathy and 12 patients
Nguyen, TV, Morrison, NA, Sambrook, PN, Kelly, PJ & Eisman, JA 1996, 'Vitamin D receptor gene and osteoporosis.', J Clin Endocrinol Metab, vol. 81, no. 4, pp. 1674-1675.
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O'Dowd, BF, Nguyen, T, Lynch, KR, Kolakowski, LF, Thompson, M, Cheng, R, Marchese, A, Ng, G, Heng, HHQ & George, SR 1996, 'A novel gene codes for a putative G protein-coupled receptor with an abundant expression in brain', FEBS Letters, vol. 394, no. 3, pp. 325-329.
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Following the cloning of the dopamine receptors we continued a search of the human genome for related genes. We searched an EST data base and discovered cDNA fragments encoding novel G protein-coupled receptor genes. The available GenBank sequence of one of these EST fragments showed that it encoded a receptor with closest similarity to the D2 dopamine and adrenergic receptors. This cDNA was used to isolate the gene (GPR19), and the encoded receptor also demonstrated similarity with the neuropeptide Y receptor. The gene was mapped to chromosome 12, in region p13.2-12.3. Northern blot analysis revealed expression of GPR19 in peripheral regions, and brain regions significantly overlapping with the D2 receptor gene expression. A sequence of the rat orthologue of GPR19 was obtained and in situ hybridization analysis demonstrated a very abundant expression in rat brain.
ONO, E, HOSOE, S, TUAN, HD & HAYASHI, Y 1996, 'NonlinearH∞Control of Active Suspension', Vehicle System Dynamics, vol. 25, no. sup1, pp. 489-501.
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Oppermann, I & Vucetic, BS 1996, 'Capacity of a coded direct sequence spread spectrum system over fading satellite channels using an adaptive LMS-MMSE receiver', IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E79-A, no. 12, pp. 2043-2049.
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This paper examines the performance of a direct sequence, spread spectrum (DSSS) multiple access (MA) system used over two typical, frequency-selective, fading satellite channels. In an attempt to increase the system efficiency, an adaptive receiver described by Rapajic and Vucetic [1] has been implemented. This system has been combined with soft-decision convolutional coding in order to improve the system performance under the fading conditions relative to the uncoded system and to allow as many simultaneous users as possible. Various code rates have been examined and the results are given. This paper specifically focuses on DSSS-MA systems with low spreading ratios. The satellite channels used in this paper were produced by models developed as a result of experimental measurements of fading satellite channels for rural and urban environments.
Oppermann, I, White, B & Vucetic, BS 1996, 'A Markov model for wide-band fading channel simulation in micro-cellular systems', IEICE TRANSACTIONS ON COMMUNICATIONS, vol. E79B, no. 9, pp. 1215-1220.
Perry, SW & Guan, L 1996, 'A Partitioned Modified Hopfield Neural Network Algorithm for Real-Time Image Restoration', Real-Time Imaging, vol. 2, no. 4, pp. 215-224.
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Pham, DH & Burnett, IS 1996, 'Quantisation techniques for Prototype Waveforms', ISSPA 96 - FOURTH INTERNATIONAL SYMPOSIUM ON SIGNAL PROCESSING AND ITS APPLICATIONS, PROCEEDINGS, VOLS 1 AND 2, vol. 1, pp. 53-56.
Saleh, A & Parsanejad, S 1996, 'Application of orthogonalised load/deflection states to the collapse behaviour of grout-filled damaged tubular members', Structural engineering review, vol. 8, no. 2-3, pp. 269-275.
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Framed off-shore structures are normally made of tubular members. These members are prone to damage by collision from supply boats or by the impact of dropped objects. Experimental and theoretical work has indicated that such damage can cause a significant loss of member strength and the grouting is an effective way of repair for tubular members with a moderate degree of damage. An existing numerical approach based on the method of orthogonalised load/deflection states has been successfully employed to establish the pre- and post-ultimate force/displacement relationships of damaged tubes and grout-filled damaged tubes. The paper comprises an explanation of the analytical method used, adaptation of the method for analysis of fully grout-filled damaged tubes and the presentation of the results. A comparison is made between the experimental and analytical results.
Sawamura, S, Kanda, H, Miyanaga, Y & Tochinai, K 1996, 'Maximum likelihood estimation of multiple sources using a local optimization method', Electronics and Communications in Japan (Part III: Fundamental Electronic Science), vol. 79, no. 11, pp. 14-24.
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Shimizu, J, Miyanaga, Y & Tochinai, K 1996, 'Signal enhancement using a robust adaptive total least squares algorithm.', Journal of the Acoustical Society of Japan (E), vol. 17, no. 6, pp. 285-293.
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An adaptive enhancement algorithm of signal disturbed by the impulse noise and the white Gaussian noise is proposed in this paper. If the strong dependence between signal enhancement and needed-parameter estimation exists in an algorithm, it is difficult to reduce a large bias occurring in the first estimation. To weaken their relationship, it is considered to introduce a total least squares (TLS) algorithm which estimates model parameters directly from disturbed signals. However, the TLS estimation accuracy is dramatically deteriorated by the impulse noise, even if the TLS estimation accuracy is held to the non-Gaussian noise in some degree. Hence, we ensure the robustness of the algorithm by replacing a high amplitude signal with an estimated value based on a likelihood ratio test. Using these signals, we develop an algorithm based on the TLS and the EM algorithm for enhancing the disturbed signal. We also show the effectiveness of the proposed algorithm through computer simulations.
Shimizu, J, Miyanaga, Y & Tochinai, K 1996, 'Tracking capability and floating-point error analysis in multirate complex recursive weighted least squares algorithm', Electronics and Communications in Japan (Part III: Fundamental Electronic Science), vol. 79, no. 3, pp. 11-22.
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Smith, CL & Voinov, A 1996, 'Resource management: Can it sustain pacific northwest fishery and forest systems?', Ecosystem Health, vol. 2, no. 2, pp. 156-158.
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The relative effectiveness of resource management regimes is widely discussed. Sustainability and ecosystem health are two dimensions upon which the effect of management is judged. Evaluating resource management requires long time spans. We look at the impact of management on fish and forest resources by taking a life cycle approach to the exploitation of natural capital. Russian ethnographer Gumilev (1990) describes the process of how human systems go through a set of phases that parallel the birth, growth, maturity, and death stages of the life cycle. The process of adaptive renewal proposed by Holling (1992), too, has life cycle characteristics. The primary variables used to represent the phases of the renewal cycle are the amount of capital that is accumulated and the connectedness in the system. We apply the renewal cycle to a fishery and forestry example in the U.S. Pacific Northwest to see how management regimes alter the capital stock of these systems. In these two examples, 90% of the natural capital is lost or projected to be lost over a century and a half of exploitation. The management regime in both cases evolves toward greater inflexibility. Based on these two examples, resource management does not seem to lead to sustainability or ecosystem health. © 1996 Blackwell Science, Inc.
Sprey, MA & Bird, TS 1996, 'Minimise pattern degradation when subreflector vertex shaping is used to improve feed match', Electronics Letters, vol. 32, no. 9, pp. 781-781.
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Sreenivasan, SV & Waldron, KJ 1996, 'Displacement Analysis of an Actively Articulated Wheeled Vehicle Configuration With Extensions to Motion Planning on Uneven Terrain', Journal of Mechanical Design, vol. 118, no. 2, pp. 312-317.
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This manuscript presents a displacement analysis of actively articulated wheeled vehicles on uneven terrain. These vehicles are distinct from traditional wheeled systems since they have the ability to actively adapt to variations in the terrain and they can actively influence the forces at the wheel-terrain contact locations. They also possess special mobility capabilities such as obstacle climbing and self-recovery from an over-turn failure. The problem of solving for the configuration of these vehicles on uneven terrain has been addressed in detail. The displacement analysis leads to multiple solutions due to the inherent nonlinearity in the position kinematic equations. Geometric reasoning has been used to identify the particular configuration that represents the “correct” vehicle geometry on the terrain. Applications of the displacement analysis algorithms to vehicle planning on uneven terrain have been discussed. An obstacle climbing maneuver of a three-module actively articulated wheeled vehicle has been described.
Sreenivasan, SV, Waldron, KJ & Mukherjee, S 1996, 'Globally Optimal Force Allocation in Active Mechanisms With Four Frictional Contacts', Journal of Mechanical Design, vol. 118, no. 3, pp. 353-359.
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Mechanisms interacting with their environments that possess complete contact force controllability such as multifingered hands and walking vehicles are considered in this article. In these systems, the redundancy in actuation can be used to optimize the force distribution characteristics. The resulting optimization problems can be highly nonlinear. Here, the redundancy in actuation is characterized using geometric reasoning which leads to simplifications in the formulation of the optimization problems. Next, advanced polynomial continuation techniques are adapted to solve for the global optimum of an important nonlinear optimization problem for the case of four frictional contacts. The algorithms developed here are not suited for real-time implementation. However, these algorithms can be used in off-line force planning, and they can be used to develop look-up tables for certain applications. The outputs of these algorithms can also be used as a baseline to evaluate the effectiveness of sub-optimal schemes.
Staveley-Smith, L, Wilson, WE, Bird, TS, Disney, MJ, Ekers, RD, Freeman, KC, Haynes, RF, Sinclair, MW, Vaile, RA, Webster, RL & Wright, AE 1996, 'The Parkes 21 cm Multibeam Receiver', Publications of the Astronomical Society of Australia, vol. 13, no. 3, pp. 243-248.
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Several extragalactic HI surveys using a λ21 cm 13-beam focal plane array will begin in early 1997 using the Parkes 64 m telescope. These surveys are designed to detect efficiently nearby galaxies that have failed to be identified optically because of low optical surface brightness or high optical extinction. We discuss scientific and technical aspects of the multibeam receiver, including astronomical objectives, feed, receiver and correlator design and data acquisition. A comparison with other telescopes shows that the Parkes multibeam receiver has significant speed advantages for any large-area λ21 cm galaxy survey in the velocity range range 0–14000 km s−1.
Stewart, MG 1996, 'Optimization of serviceability load combinations for structural steel beam design', Structural Safety, vol. 18, no. 2-3, pp. 225-238.
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In Australia, typical design load combinations for serviceability are ψsQ and G + ψsQ (D and D + L in the US) where G and Q are design dead and live loads, respectively, and ψs is a short-term live load factor. Code calibration is conducted herein for Australian and US serviceability load combinations, for structural steel beams in flexure. The effects that office, retail, domestic and car parking loads and tributary areas have on serviceability reliability is described. It was found that serviceability reliabilities for different floor uses vary considerably for Australian and US serviceability load combinations; whereas the differences between serviceability reliabilities for one year and duration of a single tenancy reference periods were not great. Short-term live load factors for most floor uses were adjusted (sometimes significantly) to ensure that serviceability reliabilities exceed the minimum target level of 1.65. Consequently, the present paper provides suggested values for short-term live load factors that may be used in Australian and possibly in US codes. Copyright © 1996 Elsevier Science Ltd.
Stewart, MG 1996, 'Serviceability Reliability Analysis of Reinforced Concrete Structures', Journal of Structural Engineering, vol. 122, no. 7, pp. 794-803.
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A probabilistic model is developed to estimate immediate, creep, and shrinkage deflections. Monte Carlo simulation is used to estimate deflections and probabilities of serviceability failure (lifetime and for each 8 yr tenancy) for reinforced concrete beams sized according to the span-to-depth ratio serviceability requirements of Australian, British, and American Concrete Structures Codes. Serviceability failure is denned to occur when a deflection exceeds an allowable deflection limit as a result of flexure. It was found that the span-to-depth ratio serviceability requirements of these codes produce significantly different serviceability reliabilities. This is probably a consequence of the fact that the serviceability specifications of these codes have not been subjected to code calibration. A code-calibration exercise considering load factors, loading combinations, and/or allowable deflection limits may minimize these variations in serviceability reliabilities.
Szuladzinski, G & Saleh, A 1996, 'Analysis of braking a cylindrical boulder and application to bench blasting', Acta Mechanica, vol. 115, no. 1-4, pp. 79-85.
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Tellambura, C, Guo, YJ & Barton, SK 1996, 'Co-channel and self-interference analysis for indoor wireless channels', Wireless Personal Communications, vol. 3, no. 4, pp. 411-419.
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To achieve a user data rate of 20 Mbit/s in the high performance local area network (HIPERLAN) system operating in indoor environments, channel equalization must be used to mitigate the effects of multipath propagation. If, however, the indoor channel impulse response length is too long, then the multipath power outside of the equalisation capability of the equalizer acts as a form of self interference. Moreover, co-channel interference may also be present at the detector input. Considering these two effects as well as the rms delay spread, this paper derives analytical expressions for the probability of outage. © 1996 Kluwer Academic Publishers.
Tellambura, C, Guo, YJ & Barton, SK 1996, 'Equaliser Performance for HIPERLAN in indoor channels', Wireless Personal Communications, vol. 3, no. 4, pp. 397-410.
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In order to accomplish practical deployment modelling for system performance evaluation and comparison for possible modulation and equalisation schemes to be used in HIPERLAN, a wide band tapped delay line (WTDL) channel model has been adopted by ETSI to characterise the multipath fading in the indoor radio environment. Based on this statistical channel model, and using Monte Carlo method, this paper evaluates the average probability of error for linear and decision feedback equalisers as a function of signal-to-noise ratio. It also evaluates the matched filter bound for this channel model. The results show the optimum performance levels achievable via the use of any equaliser. © 1996 Kluwer Academic Publishers.
Thomas, PS 1996, 'Dependence of the friction process on the molecular structure and architecture of thin polymer films', Tribology International, vol. 29, no. 8, pp. 631-637.
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Tuan, HD 1996, 'On solution sets of nonconvex Darboux problems and applications to optimal control with endpoint constraints', The Journal of the Australian Mathematical Society. Series B. Applied Mathematics, vol. 37, no. 3, pp. 354-391.
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AbstractWe prove a continuous version of a relaxation theorem for the nonconvex Darboux problem xlt ε F(t, τ, x, xt, xτ). This result allows us to use Warga's open mapping theorem for deriving necessary conditions in the form of a maximum principle for optimization problems with endpoint constraints. Neither constraint qualification nor regularity assumption is supposed.
Tuan, HD & Hosoe, S 1996, 'Comments on consistency of quadratic forms', IEEE Transactions on Automatic Control, vol. 41, no. 8, pp. 1215-1216.
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Tuan, HD & Hosoe, S 1996, 'On linearization technique in robust nonlinear ∞ control', Systems & Control Letters, vol. 27, no. 1, pp. 21-27.
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Vigneswaran, S, Boonthanon, S & Prasanthi, H 1996, 'Filter backwash water recycling using crossflow microfiltration', Desalination, vol. 106, no. 1-3, pp. 31-38.
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Experiments were carried out using crossflow microfiltration (CFMF) for treating filter backwash water from a water treatment plant, It was found that CFMF with backflush is technically feasible and highly efficient. The condition of the backflush freque
Vigneswaran, S, Prasanthi, H & Dharmappa, HB 1996, 'Implications of particle size to transient stage of deep bed filtration', Korean Journal of Chemical Engineering, vol. 13, no. 6, pp. 565-572.
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This study was aimed at investigating the effect of particle size, mostly in the submicron range, on break-through stage of filtration. Latex beads, with diameters ranging from 0.46- to 2.967-μm were filtered through filter grains of diameters 0.1-, 0.175- and 0.45-mm. Experimental conditions were chosen so as to obtain breakthrough curves. The experimental results showed that the initial efficiency follows the pattern reported by previous experimental and theoretical studies, i.e., lower efficiency for 0.825-μm particles which fall in the range of critical size. However, the particle removal during the transient stage increased with an increase in particle size for the range of sizes studied. This pattern is qualitatively confirmed by the theoretical predictions of Vigneswaran and Chang (1986) model. This study also provides experimental verification of the effect of the ratio of particle size and grain size at different stages of filtration.
Vinh, H, Wain, J, Vo, TN, Cao, NN, Mai, TC, Bethell, D, Nguyen, TT, Tu, SD, Nguyen, MD & White, NJ 1996, 'Two or three days of ofloxacin treatment for uncomplicated multidrug-resistant typhoid fever in children', Antimicrobial Agents and Chemotherapy, vol. 40, no. 4, pp. 958-961.
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An open randomized comparison of 2 days (Ofx2) versus 3 days (Ofx3) of oral ofloxacin treatment (15 mg/kg/day) was conducted with Vietnamese children between 1 and 15 years of age with suspected typhoid fever. Of 108 children enrolled, 100 were blood culture positive for Salmonella typhi, and 86% of the isolates were multidrug resistant. There were no significant adverse effects. The therapeutic responses were similar in both groups, with mean (+/- standard deviation) fever clearances of 107 +/- 60 h in the Ofx3 group and 100 +/- 64 h in the Ofx2 group (P > 0.2). There were six 'clinical' failures in the Ofx2 group and two clinical failures in the Ofx3 group (P > 0.2), in which fever and symptoms persisted for more than 1 week after the start of treatment, but only one of these was culture positive (Ofx3). There was one suspected relapse, and one carrier was identified. Short courses of ofloxacin are simple, inexpensive, safe, and effective for the treatment of uncomplicated multidrug-resistant typhoid fever.
Von Bibra, ML, Canning, J & Roberts, A 1996, 'Mode profile modification of H+ ion beam irradiated waveguides using UV processing', Journal of Alloys and Compounds, vol. 239, no. 1, pp. 121-125.
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Buried channel waveguides made by a direct-write focussed hydrogen ion beam in high quality fused silica were investigated for mode and spectral changes under 193 nm ultra violet irradiation. The guides exhibited a negative index change of approximately 10% of the core cladding difference after a dose of 1 kJ cm-2, and an increase in attenuation at infrared wavelengths. This effect could have application in tailoring the shape of mode field profiles for efficient cou-pling between waveguides. © 1998 Elsevier Science B.V. All rights reserved.
Waldron, KJ & Sreenivasan, SV 1996, 'A Study of the Solvability of the Position Problem for Multi-Circuit Mechanisms by Way of Example of the Double Butterfly Linkage', Journal of Mechanical Design, vol. 118, no. 3, pp. 390-395.
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It is frequently forgotten that the common methods of position analysis of planar linkages, which are based on dyadic decomposition, are not general. This is true regardless of whether a graphical or analytical approach is used. It is demonstrated in this paper that relatively simple linkages can give rise to problems that cannot be addressed by dyadic decomposition methods, and that solution of these problems can be far more complex.
Ying, MS 1996, 'When is the ideal completion of abstract basis algebraic', THEORETICAL COMPUTER SCIENCE, vol. 159, no. 2, pp. 355-356.
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The concepts of abstract basis and its ideal completion play an important role in domain theory because the category of bases (and approximable relations) is equivalent to the category of continuous domains (and continuous mappings) (cf. [1, Theorem 2.2.
Zhou, JL, Fileman, TW, Evans, S, Donkin, P, Mantoura, RFC & Rowland, SJ 1996, 'Seasonal distribution of dissolved pesticides and polynuclear aromatic hydrocarbons in the Humber Estuary and Humber coastal zone', Marine Pollution Bulletin, vol. 32, no. 8-9, pp. 599-608.
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Zhu, JG, Hui, SYR & Ramsden, VS 1996, 'A generalized dynamic circuit model of magnetic cores for low- and high-frequency applications .1. Theoretical calculation of the equivalent core loss resistance', IEEE TRANSACTIONS ON POWER ELECTRONICS, vol. 11, no. 2, pp. 246-250.
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Alkussayer, HM, Guo, YJ & Barton, SK 1970, 'Low-cost multi-user receiver for synchronous CDMA systems', Conference Record / IEEE Global Telecommunications Conference, pp. 1588-1591.
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The effect of noise enhancement of the linear decorrelating detector (LDD) is investigated by studying a low complexity receiver for synchronous Code Division Multiple Access (CDMA) systems. Using Gold codes as the spreading sequences a general formula of the decorrelating matrix is obtained, which leads to a simplified receiver structure and explicit expression of the bit error ratio (BER). It is shown that even with multiple access interference (MAI) reduced, the BER of the system is still dependent on the bandwidth efficiency. For a given bandwidth, efficiency, the system performance improves when the processing gain is increased.
Alkussayer, HM, Zheng, FC, Guo, YJ & Barton, SK 1970, 'Time diversity decorrelator (TDD); a near-far resistant detector for asynchronous CDMA system', IEEE Vehicular Technology Conference, pp. 564-568.
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In this paper a near-far resistance detector for asynchronous Code-Division Multiple-Access (CDMA) systems operating in Additive White Gaussian Noise (AWGN) channels is presented. The multi-user interference caused by K users transmitting simultaneously, each with a specific signature sequence, is completely removed at the receiver. The complexity of this detector grows only linearly with the number of users, as compared to the optimum multi-user detector which requires exponential complexity in the number of users. A modified algorithm based on time diversity is described. It performs detection on a bit-by-bit basis and overcomes the complexity of using a sequence detector. The performance of this detector is shown to be superior to that of the conventional receiver.
Arkwright, J, Atkins, G, Canning, J, Chu, P, Janos, M, Sceats, M & Wu, B 1970, 'Resonantly enhanced nonlinearities in rare earth doped fibres and waveguides', DOPED FIBER DEVICES, Conference on Doped Fiber Devices, SPIE - INT SOC OPTICAL ENGINEERING, DENVER, CO, pp. 172-182.
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Baweja, D, Roper, H & Sirivivatnanon, V 1970, 'Corrosion of steel in marine concrete: Long-term half-cell potential and resistivity data', American Concrete Institute, ACI Special Publication, pp. 89-110.
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This paper presents some results from a major research project carried out on corrosion of steel reinforcement in concrete. The performance of a range of Portland and blended cement concretes containing fly ash and blast furnace slag exposed to simulated marine conditions was evaluated over a period of six years. A large amount of data relating to corrosion of embedded steel in concrete was obtained in this project. Long-term half cell potential data on reinforcement within concrete slabs and resistivity data on the same concrete specimens has been considered in detail in this paper. Rates of corrosion of steel in concrete were also measured using potentiodynarnic anodic polarization procedures. Trends observed in the data were different for the portland and blended cement concretes investigated. It was found that concrete resistivity may influence the measured half cell potential of steel in concrete. This factor needs to be taken into account for half cell potential data interpretations.
Bird, TS 1970, 'Modelling arrays of circular horns with choke rings', IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), pp. 226-229.
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Arrays of circular waveguides or horns are commonly used in directly radiating arrays or as feeds for reflectors. An application of the latter that holds continuing interest is the production of shaped beams with satellite antennas and the ability to design cycling time. Arrays of circular horns was modeled for satellite antennas taking into account coaxial-choke rings. This paper outlines methods in computer software that has been developed to take this factor into account. Some results are presented to demonstrate the accuracy of the software and its application.
Brookes, W & Indulska, J 1970, 'Teaching internet literacy to a large and diverse audience', Proceedings of the second Australasian conference on Computer science education - ACSE '97, the second Australasian conference, ACM Press, pp. 7-15.
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© 1997 ACM. Very large and diverse audiences pose a variety of problems for lecturers and students alike [l]. This paper presents an approach used in the School of Information Technology at The University of Queensland to teach an Internet literacy course to a diverse student audience. The course provides an introduction to computer networks and teaches students from various university faculties how to effectively use a variety of Internet services. The subject integrates efforts on teaching Internet literacy at the university in order to minimise teaching effort and to maximise quality of teaching. The paper discusses the variety of means deployed in order to provide a flexible, self-directed learning environment for the course. This led to: The inclusion of QUIKF'ro!, a specially developed Computer Based Training package on Internet services and resources; providing easy access to learning materials from campus or from home; and using innovative assessment methods which aim at improving the process and quality of assessment. Assessment was carried out online and used anonymous assessment, peer assessment and criterion-referenced marking.
Burnett, IS & Parry, JJ 1970, 'On the effects of accent and language on low rate speech coders', International Conference on Spoken Language Processing, ICSLP, Proceedings, pp. 291-294.
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Telecommunications networks are exposed to a plethora of accents and languages. Fundamental to current and future systems are low rate speech coders. This paper examines the problems associated with speech coding of different languages and accents. Our investigations show that most low-rate (8 kb/s and below) speech coders show bias towards non-accented English. When the coders are used for heavily accented English or other languages, significant performance degradation is noted. This paper examines the reasons for such variations and some approaches for improving coder performance.
Chin-Teng Lin & Chia-Feng Juang 1970, 'An adaptive neural fuzzy filter and its applications', Proceedings of IEEE 5th International Fuzzy Systems, IEEE 5th International Fuzzy Systems, IEEE, pp. 564-569.
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A new kind of nonlinear adaptive filter, the adaptive neural fuzzy filter (ANFF), based upon neural network's learning ability and fuzzy if-then rule structure is proposed in this paper. The ANFF is inherently a feedforward multilayered connectionist network which can learn by itself according to numerical training data or expert knowledge represented by fuzzy if-then rules. The adaptation here includes the construction of fuzzy if-then rules (structure learning), and the tuning of the free parameters of membership functions (parameter learning). There are no hidden nodes (i.e., no membership functions and fuzzy rules) initially, and both the structure learning and parameter learning are performed concurrently as the adaptation proceeds. Two major advantages of the ANFF are: 1) a priori knowledge can be incorporated into the ANFF which makes the fusion of numerical data and linguistic information in the filter possible; and 2) no predetermination, like the number of hidden nodes, must be given, since the ANFF can find its optimal structure and parameters automatically. To demonstrate the performance of the ANFF, two applications, the nonlinear channel equalization and the adaptive noise cancellation, are simulated.
Chin-Teng Lin, Chia-Feng Juang & Chung-Ping Li 1970, 'Temperature control with a neural fuzzy inference network', Soft Computing in Intelligent Systems and Information Processing. Proceedings of the 1996 Asian Fuzzy Systems Symposium, Soft Computing in Intelligent Systems and Information Processing. 1996 Asian Fuzzy Systems Symposium, IEEE, KENTING, TAIWAN, pp. 91-96.
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Cuthbert, J & Braun, RM 1970, 'Multi-h modulation indexes selection using the PBIL algorithm', Proceedings of IEEE. AFRICON '96, IEEE. AFRICON '96, IEEE, STELLENBOSCH, SOUTH AFRICA, pp. 1109-1114.
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Fuente, MP, Guo, YJ & Barton, SK 1970, 'New scheme for direct sequence spread spectrum radio LANs', IEEE International Symposium on Spread Spectrum Techniques & Applications, pp. 1320-1324.
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A new direct sequence spread spectrum scheme for ISM band Radio Local Area Networks using BPSK modulation and matched filter receivers is presented. It employs an optimized 22-chip sequence whose two 11-chip segments are alternately used as spreading sequences for adjacent symbols. Owing to the low cross-correlation between the two 11-chip segments, the inter-symbol interference caused by long delays in multipath channels is significantly reduced. In the paper, a receiver structure using the optimized sequence and time diversity is described and simulation results are given. Compared with the schemes using the short 11-chip Barker code and long M-sequences, the new scheme offers superior system performance.
Gorton, I, Hawryszkiewycz, I & Fung, L 1970, 'Enabling software shift work with groupware: a case study', Proceedings of HICSS-29: 29th Hawaii International Conference on System Sciences, Proceedings of HICSS-29: 29th Hawaii International Conference on System Sciences, IEEE, pp. 72-81.
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Describes a software development trial to evaluate the use of a groupware support environment for widely geographically separated software development teams. A four-person dislocated team, working in (simulated) disjoint time zones, was assigned a development task to carry out over a two-week period. Due to the time and location displacement, the developers were denied almost all opportunities for synchronous communications and had to rely on support from a prototype software engineering support system developed in Lotus Notes for interactions and coordination. In addition, the tasks in the trial were allocated such that productivity gains could be experienced through positive exploitation of time-zone differences, effectively giving around-The-clock working. This paper describes the design and organisation of the trial, reports on the progress of the trial, and presents both quantitative and qualitative results regarding the use of the Notes prototype.
Hadgraft, R & Wigan, M 1970, 'Evaluating hypertext', 1996 IEEE International Conference on Multi Media Engineering Education. Conference Proceedings, 1996 IEEE International Conference on Multi Media Engineering Education. Conference Proceedings, IEEE, UNIV MELBOURNE, MELBOURNE, AUSTRALIA, pp. 403-408.
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Hadgraft, R & Wigan, M 1970, 'Insights from modelling user behaviour in a hypertext', 1996 IEEE International Conference on Multi Media Engineering Education. Conference Proceedings, 1996 IEEE International Conference on Multi Media Engineering Education. Conference Proceedings, IEEE, UNIV MELBOURNE, MELBOURNE, AUSTRALIA, pp. 419-424.
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Hoang, DB & James, MR 1970, 'AMI: A model of intelligence', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Springer Berlin Heidelberg, pp. 181-192.
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© Springer-Verlag Berlin Heidelberg 1996. It is reasonable to say that so far neural networks have performed very well on many specific tasks of reasonable size, but their performance is far from satisfactory when applied to realistic but complex tasks such speech recognition and language processing. Yet the brain can perform these tasks efficiently and effortlessly (seemingly) using its optimized mechanisms. It is believed crucial to discover these mechanisms. In this paper, a neural network model of the isocortex as basic building block of intelligent systems is consolidated. The model incorporates mechanisms extracted from cortical circuit as suggested from the study of neuroanatomy. The learning rule compatible with what is known about synaptic adaptation in the neocortex is introduced. Simulations results, which verify the mathematical proof of the model stability and robustness, are presented.
Horita, E, Nishikawa, K & Miyanaga, Y 1970, 'A fast recursive least-squares with a weighting factor based an a 2-D NSHP AR model and its application to spectral estimation', 1996 IEEE Digital Signal Processing Workshop Proceedings, 1996 IEEE Digital Signal Processing Workshop Proceedings, IEEE, LOEN, NORWAY, pp. 339-342.
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Jordaan, GD, Du Plooy, CE & Braun, RM 1970, 'Clock recovery scheme for 7PRS signals', IEEE AFRICON Conference, pp. 397-401.
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Baseband PRS signals do not contain any spectral components at the symbol rate or submultiples thereof. For this reason difficulty is frequently experienced in synchronizing a PRS receiver with the data transmitter. This is a description of a novel synchronization scheme developed for such signals - using digital signal processing (DSP) techniques. A channel filter with a response derived from the raised cosine (RC) frequency response is used. This is followed by a limited amount of processing, resulting in a substantial signal at the required frequency.
Leaney, J, Peterson, C & Drane, C 1970, 'Computer systems engineering in large groups', Proceedings - Frontiers in Education Conference, 26th Annual conference on Frontiers in Education - Technology-Based Re-Engineering Engineering Education (FIE 96), I E E E, SALT LAKE CITY, UT, pp. 1491-1494.
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The subjects Computer Systems Analysis and Computer Systems Design within the computer systems engineering degree at UTS concern themselves with the specification, architecture, design and implementation of a computer based system of moderate complexity, covering electrical and mechanical hardware, computer hardware and software. Students are expected to develop the system to appropriate standards, using suitable techniques, within a defined process and operating within a team. The computer based system is concerned with the problem of the automatic assembly of (pseudo) chocolates into (pseudo) chocolate boxes. There are a variety of boxes and a variety of chocolates, which have to be assembled to (operator entered) orders. The class is divided into teams. A team comprises five groups. Each of four groups is responsible for one of the major subassemblies, and the fifth group is responsible for the systems engineering and telecommunications. The major subassemblies are the assembly robot, the box conveyor and (Vision) recognition system, the chocolate recognition system, and the supervisory control system. The project has been running for five years and this paper summarizes the history, reports on the development and analyses educational aspects. Student appreciation of the subjects has been entirely positive, with the most often made comment that finally they have understood why they have studied engineering for the previous four to five years.
Marjanovic, O & Cecez-Kecmanovic, D 1970, 'Collaborative distance learning', 1996 IEEE International Conference on Multi Media Engineering Education. Conference Proceedings, 1996 IEEE International Conference on Multi Media Engineering Education. Conference Proceedings, IEEE, UNIV MELBOURNE, MELBOURNE, AUSTRALIA, pp. 59-64.
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Miyanaga, Y, Motoyoshi, K & Tochinai, K 1970, 'Recognition of three dimensional objects using a directional coupled neural network', 1996 IEEE Digital Signal Processing Workshop Proceedings, 1996 IEEE Digital Signal Processing Workshop Proceedings, IEEE, LOEN, NORWAY, pp. 259-262.
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Nel, EJ & Braun, RM 1970, 'Development of a directional coupler to be used on the two-wire sections of dial-up telephone lines', IEEE AFRICON Conference, 1996 IEEE AFRICON / 4th AFRICON Conference in Africa - Electrical Energy Technology, Communication Systems, Human Resources, I E E E, STELLENBOSCH, SOUTH AFRICA, pp. 570-575.
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This project aims to develop a directional coupler for use on dial-up telephone lines. The need for such a coupler originated with the acceptance of the CCITT's (International Telegraph and Telephone Consultative Committee) V.32 bis recommendation regarding the operation of high-speed modems. This standard allows modems to communicate on the telephone network both simultaneously as well as within the same frequency band. The modems involved use a mechanism called echo cancellation to overcome this problem (with echo cancellation the modem subtracts that which it transmits from the signal on the line to get the signal it wishes to receive). However, a third party surveying the (two-wire sections of the) line is unable to interpret the signals on the line as there appears to be only one garbled signal. This paper develops the theoretical basis necessary for a directional coupler that will separate this garbled signal into its constituent signals and thus enable interpretation of such signals by a third party.
Ono, E, Hosoe, S, Tuan, HD & Doi, S 1970, 'Robust stabilization of vehicle dynamics by active front wheel steering control', Proceedings of the IEEE Conference on Decision and Control, 35th IEEE Conference on Decision and Control, I E E E, KOBE, JAPAN, pp. 1777-1782.
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A control strategy of the active front wheel steering system is presented to protect the vehicle from spin and to realize improved cornering performance. Vehicle spin behavior is analyzed using bifurcation theory. The saturation characteristics of rear tires are modeled by a linear function with uncertainty terms of a special structure. The vehicle unstability is caused by a saddle-node bifurcation and depends heavily on the rear tire side force saturation.
Oppermann, I & Vucetic, BS 1970, 'Capacity of a coded direct sequence spread spectrum system over fading satellite channels using an adaptive LMS-MMSE receiver', IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, IEEE 4th International Symposium on Spread Spectrum Techniques and Applications (IEEE ISSSTA 96), IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, MAINZ, GERMANY, pp. 2043-2049.
Oppermann, I & Vucetic, BS 1970, 'Coded direct sequence spread spectrum systems over satellite channels using an adaptive receiver', Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications, ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications, IEEE, MAINZ, GERMANY, pp. 940-944.
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Oppermann, I, Vucetic, BS & Talvitie, J 1970, 'Capacity of a low mobility spread spectrum system over a wireless local loop', Proceedings of GLOBECOM'96. 1996 IEEE Global Telecommunications Conference, GLOBECOM'96. 1996 IEEE Global Telecommunications Conference, IEEE, QUEEN ELIZABETH II CONFERENCE CTR, WESTMINSTER, LONDON, ENGLAND, pp. 1761-1765.
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Peng, M, Guo, YJ & Barton, SK 1970, 'One-shot linear decorrelating detector for asynchronous CDMA', Conference Record / IEEE Global Telecommunications Conference, pp. 1301-1305.
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A one-shot linear decorrelating detector(LDD) for the detection of asynchronous CDMA is presented. By treating every user as two independent users and using maximal ratio combining, a bit-by-bit detection is obtained. By applying a phase estimation algorithm on the output of the one-shot LDD, it is shown that the proposed detector can be used for the detection of asynchronous CDMA without the knowledge of carrier phase of any user. Simulation results show that the performance of the proposed detector approaches that of the optimum detector for single user transmission.
Purchase, H, Hussey, A, Brookes, W & Leadbetter, D 1970, 'Fostering interest in information technology', Proceedings of the second Australasian conference on Computer science education - ACSE '97, the second Australasian conference, ACM Press, pp. 126-134.
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© 1997 ACM. Fostering an interest in Information Technology (IT) in school students is important both for the IT industry and for universities: We therefore enthusiastically welcomed the opportunity to hold an Information Technology vacation school for year 12 students in April 1996. Initiated and sponsored by the Australian Computer Society and Rotary International, the school enabled 60 secondary students who were in the process of making decisions about tertiary study to spend three days participating in a variety of computer-related activities at The University of Queensland Department of Computer Science, and experiencing life as a university student. The students developed skills in programming in Smalltalk, and using information systems and Internet resources. In addition, they visited other departments on campus and companies in the city to see a variety of uses of IT. We hoped to give the students the opportunity to make an informed decision about their future careers. A follow-up survey in early 1997 revealed that 80% of the students felt that attendance at the school helped them with their post-school career decisions. This paper describes our experiences with running the school: The program, components, feedback, and future plans. It was a very rewarding and worthwhile experience: We hope that this paper will encourage other universities to attempt similar programs.
Rowe, D, Leaney, J & Lowe, D 1970, 'Development of a systems architecting process for computer based systems', Proceedings of ICECCS '96: 2nd IEEE International Conference on Engineering of Complex Computer Systems (held jointly with 6th CSESAW and 4th IEEE RTAW), ICECCS '96: 2nd IEEE International Conference on Engineering of Complex Computer Systems (held jointly with 6th CSESAW and 4th IEEE RTAW), IEEE Comput. Soc. Press, MONTREAL, CANADA, pp. 200-203.
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Scheding, S, Dissanayake, G, Nebot, E & Durrant-Whyte, H 1970, 'Inertially aided navigation system for an LHD', Proceedings of the Australian Data Fusion Symposium, 1st Australian Data Fusion Symposium (ADFS-96), I E E E, ADELAIDE, AUSTRALIA, pp. 77-82.
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This paper describes the theoretical development and experimental evaluation of a guidance system for an autonomous Load, Haul and Dump truck (LHD) for use in underground mining. The particular contributions of this paper are in designing the navigation system to be able to cope with vehicle slip in rough uneven terrain using information from an Inertial Navigation System (INS) and a bearing only laser. Results are presented using data obtained during field trials.
Sirivivatnanon, V, Marsh, P & Nelson, P 1970, 'Field performance of portland cement and fly ash concrete subjected to flowing seawater', American Concrete Institute, ACI Special Publication, pp. 463-479.
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The concrete lining the outfall canal of Munmorah Power Station, built by the Electricity Commission of New South Wales (now operating as Pacific Power) in the mid-1960s, has been subjected to flowing sea water for 30 years. Two type of concretes, a portland-cement concrete and a fly-ash concrete, were used for the construction of the canal. This presented an ideal opportunity for a comparison to be made of the performance of the two binders in concretes which were subjected to the same aggressive environment. Limited information was available on the concretes from trial mixture records. A recent field investigation revealed similar chloride ingress into the two concretes in the tidal zone. This was so despite the fact that the fly-ash concrete had a lower binder content than the portland-cement concrete. As such, a lower strength grade and hence a fly-ash concrete with higher water permeability can perform as well as a portland-cement concrete. In the dry area above the high tide mark, the carbonation depth of the fly-ash concrete was greater than the portland-cement concrete. No corrosion was found in any reinforcing steel as there were sufficient cover in both concretes to prevent the chloride ions or carbonation front reaching the steel. The effectiveness of a number of investigative techniques was evaluated during the investigation. It was found that the apparent chloride diffusion coefficients, determined from short-term immersion, the water permeability coefficients, and copper to copper sulfate half-cell potential measurements were poor indicators of the real long-term performance.
Stepanov, DY, Canning, J, Bassett, IM & Cowle, GJ 1970, 'Distributed-Feedback Ring All-Fiber Laser', Optics InfoBase Conference Papers, pp. 291-295.
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Continuous-wave, low-threshold and 6.5 kHz linewidth single longitudinal mode operation is achieved in a novel distributed-feedback (DFB) ring all-fiber laser configuration, using an Er3+/Yb3+-doped phosphosilicate fiber. Self-Q-switching due to saturable absorption has also been observed in the DFB ring configuration using a heavily erbium doped germanosilicate fiber.
Stepanov, DY, Canning, J, Bassett, IM & Cowle, GJ 1970, 'Distributed-Feedback Ring All-Fiber Laser', Advanced Solid State Lasers, Advanced Solid State Lasers, OSA.
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Talvitie, J, Hovinen, V, Hamalainen, M & Oppermann, I 1970, 'Wideband channel measurement and characterisation for wireless local loops', Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications, PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications, IEEE, TAIPEI, TAIWAN, pp. 5-9.
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van de Groenendaal, JG & Braun, RM 1970, 'Novel low cost direct sequence spread spectrum synchroniser', Canadian Conference on Electrical and Computer Engineering, 1996 Canadian Conference on Electrical and Computer Engineering - Glimpse into the 21st-Century, I E E E, UNIV CALGARY, CALGARY, CANADA, pp. 36-39.
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This paper presents a novel spread spectrum synchroniser that may be simpler and more cost effective than other synchronisation system. Acquisition and tracking is achieved using one network, and the decision as to whether the system is in lock only occurs once the two sequences are aligned. No intermediate decision is required on the state of synchronisation. This feature of the synchroniser makes it cost effective and easy to implement. Although the synchroniser is not suitable for low signal-to-noise applications, it does highlight that it is possible to simplify the overall synchronisation process, while still having the benefits of spread spectrum.
Waldron, KJ 1970, 'Steering Algorithms for an Actively Configurable Wheeled Vehicle', Volume 2B: 24th Biennial Mechanisms Conference, ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference, American Society of Mechanical Engineers.
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Abstract
This article describes strategies and algorithms used to steer an unconventionally configured vehicle with twelve continuously controllable degrees of freedom. The WAAV vehicle is a laboratory scale prototype of a vehicle configuration first conceived and studied in simulation as a Mars roving vehicle. It’s configuration is quite different from an automotive vehicle and requires different approaches to directional control. The work described here is restricted to smooth, level terrain, but will be generalized for use on arbitrary, rough terrain.
Wang, JG, Mohan, AS & Aubrey, TA 1970, 'Angles-of-arrival of multipath signals in indoor environments', IEEE Vehicular Technology Conference, IEEE 46th Vehicular Technology Conference - Mobile Technology for the Human Race (VTC 96), I E E E, ATLANTA, GA, pp. 155-159.
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In this work, an attempt is made to estimate the (AOA) Angles-of-Arrival) of multipath signal propagation in both azimuth and elevation inside a classroom and a convention hall using partially smoothed MUSIC (Multiple Signal Classification) algorithm. The MDL (Minimum Descriptive Length) criterion is used to decide the number of significant multipath components. The algorithms used in obtaining AOA from measured data are validated by computer simulations. Measurement results indicate that for the same transmitter power, a small room has more significant multipath reflections than a big room and such multipath reflections decrease as the distance between the transmitter and a receiver increases.
Wong, EPK, Guan, L & Perry, SW 1970, '<title>Neural network implementation of the SMSE filter for imaging processing</title>', SPIE Proceedings, Electronic Imaging: Science & Technology, SPIE, SAN JOSE, CA, pp. 77-85.
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Woodward, G, Oppermann, I & Vucetic, BS 1970, 'Adaptive techniques for increased satellite cellular mobile system capacity', Proceedings of Vehicular Technology Conference - VTC, Vehicular Technology Conference - VTC, IEEE, ATLANTA, GA, pp. 1235-1239.
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Yacef, K & Alem, L 1970, 'Evaluation of learner's skills in the context of dynamic and complex systems', INFORMATION INTELLIGENCE AND SYSTEMS, VOLS 1-4, 1996 IEEE International Conference on Systems, Man and Cybernetics - Information, Intelligence and Systems, INT ACADEMIC PUBL, BEIJING, PEOPLES R CHINA, pp. 2200-2204.
Ying, MS & BouchonMeunier, B 1970, 'Quantifiers, modifiers and qualifiers in fuzzy logic', SOFT COMPUTING IN INTELLIGENT SYSTEMS AND INFORMATION PROCESSING, IEEE, Kenting, Taiwan, pp. 490-495.
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In this paper, we propose a formalization of fuzzy logic and obtain some interesting results on fuzzy quantifiers, modifiers and qualifiers in this setting.
Zhang, DM & Alem, L 1970, 'Management of exercise-based training process', INFORMATION INTELLIGENCE AND SYSTEMS, VOLS 1-4, 1996 IEEE International Conference on Systems, Man and Cybernetics - Information, Intelligence and Systems, INT ACADEMIC PUBL, BEIJING, PEOPLES R CHINA, pp. 2910-2915.
Zowghi, D, Ghose, AK & Peppas, P 1970, 'A framework for reasoning about requirements evolution', Proceedings of the 4th Pacific Rim International Conference on Artificial Intelligence (PRICAI’96), Pacific Rim International Conference on Artificial Intelligence, Springer Berlin Heidelberg, Cairns, Australia, pp. 157-168.
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