Abry, P, Veitch, D & Flandrin, P 1998, 'Long-range Dependence: Revisiting Aggregation with Wavelets', Journal of Time Series Analysis, vol. 19, no. 3, pp. 253-266.
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Andren, J, Hilding, M & Veitch, D 1998, 'Understanding end-to-end Internet traffic dynamics', Conference Record / IEEE Global Telecommunications Conference, vol. 2, pp. 1118-1122.
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An investigative tool for the direct study of end-to-end Internet traffic is presented, featuring a hybrid timing mechanism allowing high resolution timestamping of packet departures in a UNIX environment. A method for the elimination of timing artifacts due to variations in clock rates, essential for the study of delay, is also presented. A preliminary report is given on the detailed structure of end-to-end delay and loss processes using the tool. A number of consistent properties of interest are found including long range dependence in delay and a very simple structure for loss.
Aslund, M, Canning, J & Bazylenko, M 1998, 'High-temperature stable gratings in germanosilicate planar waveguides', OPTICS LETTERS, vol. 23, no. 24, pp. 1898-1900.
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Attard, MM & Stewart, MG 1998, 'A two parameter stress block for high-strength concrete', ACI Structural Journal, vol. 95, no. 3, pp. 305-317.
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The rectangular stress block parameters in the current ACI Code are limited to concrete strengths in the range 20 to 50 MPa (2900 to 7250 psi). This paper looks at the applicability of the ACI rectangular stress block parameters to high-strength concretes. New rectangular stress block parameters are proposed that are based on a probabilistic analysis using a stress-strain relationship for high-strength concrete and that include estimates of variability and distribution of the input properties. A sensitivity analysis is also carried out to ascertain the effect of parameter uncertainty. The probabilistic models proposed can be used in a code calibration of design formula for high-strength concrete. It is shown that for a ductile singly-reinforced rectangular section, the ultimate moment capacity is relatively insensitive to the stress block model. Estimates of the ductility level at both ultimate and column capacity in primary compression failure, however, are significantly affected by the choice of the stress block model.
Ball, JE & Luk, KC 1998, 'Modeling Spatial Variability of Rainfall over a Catchment', Journal of Hydrologic Engineering, vol. 3, no. 2, pp. 122-130.
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Ball, JE, Jenks, R & Aubourg, D 1998, 'An assessment of the availability of pollutant constituents on road surfaces', SCIENCE OF THE TOTAL ENVIRONMENT, vol. 209, no. 2-3, pp. 243-254.
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Bateman, DG, Bird, TS & Mohan, AS 1998, 'Asymptotic approximation of some integrals involved in EFIE solutions using the method of moments', IEE Proceedings - Microwaves, Antennas and Propagation, vol. 145, no. 4, pp. 361-361.
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It is well known that, in electromagnetic-field analysis using the method of moments, the matrix-filling time can dominate the total solution time. Therefore, having an efficient means of calculating the elements of the matrix is important. Asymptotic an
Baweja, D, Roper, H & Sirivivatnanon, V 1998, 'Chloride-induced steel corrosion in concrete: Part 1 - Corrosion rates, corrosion activity, and attack areas', ACI MATERIALS JOURNAL, vol. 95, no. 3, pp. 207-217.
Bazylenko, MV, Moss, D & Canning, J 1998, 'Complex photosensitivity observed in germanosilica planar waveguides', OPTICS LETTERS, vol. 23, no. 9, pp. 697-699.
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Besong, AA, Tipper, JL, Ingham, E, Stone, MH, Wroblewski, BM & Fisher, J 1998, 'Quantitative comparison of wear debris from UHMWPE that has and has not been sterilised by gamma irradiation', The Journal of Bone and Joint Surgery, vol. 80, no. 2, pp. 340-344.
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Boon, JR, Zekou, E, McGloin, D & Dunn, MH 1998, 'Prediction of inversionless gain in a mismatched Doppler-broadened medium', Physical Review A, vol. 58, no. 3, pp. 2560-2566.
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Butchart, K & Braun, RM 1998, 'An adaptive modulation scheme for low Earth orbit satellites', Proceedings of the 1998 South African Symposium on Communications and Signal Processing-COMSIG '98 (Cat. No. 98EX214), pp. 43-46.
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Canning, J & Moss, D 1998, 'Grating-based transmission bandpass filters using dispersion-matched mode conversion', OPTICS LETTERS, vol. 23, no. 3, pp. 174-176.
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Canning, J, Moss, D, Aslund, M & Bazylenko, M 1998, 'Negative index gratings in germanosilicate planar waveguides', ELECTRONICS LETTERS, vol. 34, no. 4, pp. 366-367.
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Center, JR, Nguyen, TV, Pocock, NA, Noakes, KA, Kelly, PJ, Eisman, JA & Sambrook, PN 1998, 'Femoral Neck Axis Length, Height Loss and Risk of Hip Fracture in Males and Females', Osteoporosis International, vol. 8, no. 1, pp. 75-81.
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Chen, P-H, Lai, J-H & Lin, C-T 1998, 'Application of fuzzy control to a road tunnel ventilation system', Fuzzy Sets and Systems, vol. 100, no. 1-3, pp. 9-28.
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Chia-Feng Juang & Chin-Teng Lin 1998, 'An online self-constructing neural fuzzy inference network and its applications', IEEE Transactions on Fuzzy Systems, vol. 6, no. 1, pp. 12-32.
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Chin-Teng Lin & Ming-Chih Kan 1998, 'Adaptive fuzzy command acquisition with reinforcement learning', IEEE Transactions on Fuzzy Systems, vol. 6, no. 1, pp. 102-121.
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Chong, NR, Burnett, IS & Chicharo, JF 1998, 'AN IMPROVED DECOMPOSITION METHOD FOR WI USING IIR WAVELET FILTER BANKS', 5th International Conference on Spoken Language Processing, ICSLP 1998, vol. 5, pp. 1799-1802.
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In this paper, we present an alternative characteristic waveform (CW) decomposition mechanism for the Waveform Interpolation (WI) paradigm based on the Pitch Synchronous Wavelet Transform (PSWT). In this technique, IIR filters replace the conventional FIR filters of the PSWT, offering computational and spectral magnitude performance advantages, in addition to significant delay reductions. Previously, the PSWT has only incorporated filter banks with slowly reacting FIR wavelet filters. While these filters possess the desirable properties of linear phase, and design simplicity, a large delay is incurred which increases exponentially with increasing resolution. The progression to IIR filter banks gives rise to a multi-resolution decomposition mechanism, beneficial for real-time applications, such as speech coding, where delay is an important issue.
Chong, NR, Burnett, IS, Chicharo, JF & Thomson, MM 1998, 'Use of the pitch synchronous wavelet transform as a new decomposition method for WI', Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181), vol. 1, pp. 513-516.
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Cucchiara, R, Neri, G & Piccardi, M 1998, 'A real-time hardware implementation of the hough transform', Journal of Systems Architecture, vol. 45, no. 1, pp. 31-45.
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The paper presents a hardware implementation of algorithms based on the Hough transform (HT) for real-time straight line detection. In particular, the basic HT on the edge points (EHT) and the Gradient-Weighted Hough transform (GWHT) for gray-level image
Cuthbert, JA & Braun, RM 1998, 'Selection of Multi-h modulation sets using a stochastic search algorithm', IEE PROCEEDINGS-COMMUNICATIONS, vol. 145, no. 1, pp. 41-46.
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Multi-h CPFSK modulation is simple to implement, spectrally efficient, and has inherent error correction properties. Multi-h requires large parameter sets to obtain high coding gain. Large numbers of combinations may need to be investigated. A fast effic
de Notaristefani, F, Iacopi, F, Leonetti, C, Maini, CL, Malatesta, T, Mali, P, Semprebene, A, Torrioli, S, Tuma, L & Vittori, F 1998, 'A YAP camera 40/spl times/40 mm/sup 2/ with fast readout electronics', IEEE Transactions on Nuclear Science, vol. 45, no. 5, pp. 2302-2308.
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El-Ghundi, M, George, SR, Drago, J, Fletcher, PJ, Fan, T, Nguyen, T, Liu, C, Sibley, DR, Westphal, H & O'Dowd, BF 1998, 'Disruption of dopamine D1 receptor gene expression attenuates alcohol-seeking behavior', European Journal of Pharmacology, vol. 353, no. 2-3, pp. 149-158.
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The role of the dopamine D1 receptor subtype in alcohol-seeking behaviors was studied in mice genetically deficient in dopamine D1 receptors (D1-/-). In two-tube free choice limited (1-5 h) and continuous (24 h) access paradigms, mice were exposed to water and increasing concentrations of ethanol (3%, 6% and 12% w/v). Voluntary ethanol consumption and preference over water were markedly reduced in D1-/- mice as compared to heterozygous (D1+/-) and wild-type (D1+/+) controls, whereas overall fluid consumption was comparable. When offered a single drinking tube containing alcohol as their only source of fluid for 24 h, D1-/- mice continued to drink significantly less alcohol than D1+/+ and D1+/- mice. Dopamine D2 receptor blockade with sulpiride caused a small but significant reduction in alcohol intake and preference in D1+/+ mice and attenuated residual alcohol drinking in D1-/- mice. Dopamine D1 receptor blockade with SCH-23390 very effectively reduced alcohol intake in D1+/+ and D1+/- mice to the level seen in untreated D1-/- mice. These findings suggest involvement of both dopamine D1 and D2 receptor mechanisms in alcohol-seeking behavior in mice; however, these implicate D1 receptors as having a more important role in the motivation for alcohol consumption. Copyright (C) 1998 Elsevier Science B.V.
Garcia, JE & Brandwood, A 1998, 'Incompatibility of insulin pens and cartridges', The Lancet, vol. 351, no. 9105, pp. 832-833.
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Gemmell, J, Schooler, E & Kermode, R 1998, 'An architecture for multicast telepresentations', Journal of Computing and Information Technology, vol. 6, no. 3, pp. 255-272.
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We have developed a scalable reliable multicast architecture for delivering one-to-many telepresentations. Whereas the transport for interactive real-time audio and video is concerned with timely delivery, other media, such as slides, images and animations require reliability. We propose to support reliability by combining multicast with forward error correction (FEC), as well as additional techniques depending on the nature of the data. Two related but distinct protocols are used for dynamic and persistent session data. For dynamic session data, we use erasure-correcting scalable reliable multicast (ECSRM), an enhanced version of SRM by Floyd et al. that is based on NACK suppression, but improves scalability and rate control. Session-persistent data is delivered using Feast, a protocol that combines FEC and data carouseling with no back-channel from receiver to sender. Our approach is scalable to large heterogeneous receiver sets, and supports late-joining receivers. We have implemented our approach in a layered, multicast version of PowerPoint, a graphical slide presentation tool.
Gough, A, Sambrook, P, Devlin, J, Huissoon, A, Njeh, C, Robbins, S, Nguyen, T & Emery, P 1998, 'Osteoclastic activation is the principal mechanism leading to secondary osteoporosis in rheumatoid arthritis.', J Rheumatol, vol. 25, no. 7, pp. 1282-1289.
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OBJECTIVE: To use clinical measures and biochemical markers of bone turnover to investigate mechanisms of generalized bone loss in early rheumatoid arthritis (RA). METHODS: We studied 232 patients with RA of less than 2 years' duration and 72 healthy controls using serial dual x-ray absorptiometry scanning of lumbar spine and hips. Patients attended the clinic for clinical and laboratory assessment with storage of serum, urine, and plasma at each visit. Change in bone mineral density (BMD) was calculated for patients and controls and compared with baseline and mean serial values of bone markers over the same intervals. Serum was assayed for procollagen I carboxyterminal propeptide (PICP) and skeletal alkaline phosphatase (sALP); urine for pyridinoline and deoxypyridinoline corrected for creatinine; and plasma for interleukin 1 (IL-1) and IL-6. RESULTS: Patients lost bone significantly faster than controls at all sites (p < 0.01 for all). At first visit patients had significantly lower PICP levels than controls (p < 0.05) and sALP correlated with initial BMD in both patients (p < 0.01, r > 0.35, all sites) and controls (p < 0.0001, r > 0.50, all sites). We rescanned 167 patients at one year and 121 patients at 2 years. Mean urinary pyridinoline and deoxypyridinoline levels correlated strongly with BMD change at all sites, were increased in patients with active disease (p < 0.005), and correlated closely with mean C-reactive protein (CRP) (p < 0.005, r > 0.41 for both). CONCLUSION: This study suggests that osteoclastic activation, rather than suppression of bone formation, is the dominant process leading to bone loss in early RA. Although urinary pyridinoline and deoxypyridinoline were excellent markers of BMD change, CRP was found to be best overall. This provides a rational approach for selecting and treating patients with RA to reduce their established longterm risk of osteoporotic fracture.
Gough, A, Sambrook, P, Devlin, J, Lilley, J, Huisoon, A, Betteridge, J, Franklyn, J, Nguyen, T, Morrison, N, Eisman, J & Emery, P 1998, 'Effect of vitamin D receptor gene alleles on bone loss in early rheumatoid arthritis.', J Rheumatol, vol. 25, no. 5, pp. 864-868.
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OBJECTIVE: Rheumatoid arthritis (RA) is a polygenic disease characterized by localized joint destruction and generalized osteoporosis resulting in increased fracture risk. The pathogenetic mechanisms that determine the severity of generalized bone loss in RA are poorly understood. Polymorphisms in the vitamin D receptor (VDR) gene have been described as a significant determinant of bone turnover and mass. In this prospective study we describe VDR gene allele effects on bone loss in patients with early RA. METHODS: We recruited 232 patients with early RA. Bone mineral density measurements were repeated in 167 patients. Serial clinical and laboratory measures were recorded during the period of followup. DNA extraction, polymerase chain reaction amplification, and restriction fragment length polymorphism analysis of VDR alleles were performed using standard techniques. Presence of the Taq restriction site for both alleles was denoted 'tt', and absence 'TT'. RESULTS: In women with RA the tt genotype group lost bone more rapidly than subjects with TT genotype at both the lumbar spine (-0.1 vs -4.9% p.a, respectively; p < 0.05) and femoral neck (-3.9 vs -9.6%, respectively; p < 0.01). The effect was independent of other disease characteristics. CONCLUSION: The presence of the VDR gene 't' allele in female patients with RA was associated with accelerated bone loss.
Ha, QP, Nguyen, HQ, Rye, DC & Durrant-Whyte, HF 1998, 'Sliding mode control with fuzzy tuning for an electro-hydraulic position servo system', International Conference on Knowledge-Based Intelligent Electronic Systems, Proceedings, KES, vol. 1, pp. 141-148.
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This paper presents a novel robust sliding mode controller for a class of nonlinear systems. The control signal consists of an equivalent control to assign desired dynamics to the closed-loop system, a switching control to guarantee a sliding mode, and a fuzzy control to enhance fast tracking and to attenuate chattering. Sufficient conditions for asymptotic tracking are achieved when matching conditions are satisfied. The control method is applied to the position control of an electro-hydraulic servo system. To verify the potential and effectiveness of the proposed controller, simulation results demonstrate its strong robustness against a large range of parameter variations, load disturbance, and nonlinear spring stiffness.
Hadgraft, RG 1998, 'Problem-based learning: A vital step towards a new work environment', International Journal of Engineering Education, vol. 14, no. 1, pp. 14-23.
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As educators, we dream of highly motivated students who devour our courses with relish, and who are then able to competently apply what they have learned. Similarly, employers wish for highly motivated employees who will give 100% effort to their work. These are very similar requirements. In Australia, the Federal Government has offered $80M for each of the last three years, to encourage universities to develop quality assurance procedures. Although some good has come of this (e.g. an Education Policy at the author's university), little has really changed in the classroom. We still have not tackled motivation, probably the number one factor in student performance. This paper considers some of the literature on quality management, particularly of quality management, management of software teams and building creative organisations. It shows that problem-based learning (PBL) is a first step towards creating a new culture in university departments based on trust and respect for student contributions. It suggests that our departments will be the better for such a change, but that such a change will not be trivial.
Harris, M, Nguyen, TV, Howard, GM, Kelly, PJ & Eisman, JA 1998, 'Genetic and Environmental Correlations Between Bone Formation and Bone Mineral Density: A Twin Study', Bone, vol. 22, no. 2, pp. 141-145.
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Henderson, RJ, Hart, MG, Lal, SKL & Hunyor, SN 1998, 'The effect of home training with direct blood pressure biofeedback of hypertensives', Journal of Hypertension, vol. 16, no. 6, pp. 771-778.
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Home training in self-lowering of blood pressure using continuous blood pressure feedback has not previously been reported. Enhancement of laboratory-learned skills was hypothesized on the basis of outcomes from other intellectual, emotional and physical endeavours. To examine the supplementary effect of home blood pressure biofeedback training. Thirty unmedicated, mild hypertensives participated in a randomized, double-blinded, modified contingency placebo-controlled study. After suitable screening and baseline blood pressure measurements subjects undertook eight laboratory biofeedback sessions and then 12 home training sessions over 4 weeks using continuous finger blood pressure monitoring. In the laboratory those being administered active therapy (n = 16) lowered systolic pressures by 5 +/- 5.4 mmHg compared with a lowering of 4 +/- 4.2 mmHg with placebo (NS), During the fourth week at home lowering for the active group (11 +/- 8 mmHg) was greater than that with placebo (4 +/- 6.2 mmHg, P = 0.017), Arm-cuff blood pressures were not statistically different for groups and with time but that of the active group was lower by 9 +/- 15.4/7 +/- 0.2 mmHg, which is a clinically relevant change, after home biofeedback. The efficacy of self-lowering of systolic blood pressure in mild hypertensives by continuous feedback was enhanced by 6 mmHg with 4 weeks of practice at home. Standard arm-cuff blood pressure was reduced by a clinically relevant amount The home environment proved cost effective for this 'high-tech' approach.
Howard, GM, Nguyen, TV, Harris, M, Kelly, PJ & Eisman, JA 1998, 'Genetic and Environmental Contributions to the Association Between Quantitative Ultrasound and Bone Mineral Density Measurements: A Twin Study', Journal of Bone and Mineral Research, vol. 13, no. 8, pp. 1318-1327.
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Huang, S & Zhang, S 1998, 'Comments on 'design of decentralized control for symmetrically interconnected systems'', Automatica, vol. 34, no. 7, pp. 929-933.
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It is shown in this note that the Lemma in Kashlan and Geneidy (1996) is not correct. Moreover, two kinds of decentralized pole assignment problems for symmetrically interconnected systems are studied and lower-dimensional necessary and sufficient conditions for the problems to be solvable are presented. © 1998 Elsevier Science Ltd. All rights reserved.
Huang, S & Zhang, S 1998, 'Structural properties of circulant composite systems', Zidonghua Xuebao/Acta Automatica Sinica, vol. 24, no. 6, pp. 798-801.
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The structural properties of circulant composite systems is studied. It is shown that the structural controllability and existence of structurally fixed modes for such a system can be determined by the corresponding properties of its modified subsystem.
Huang, S & Zhang, S 1998, 'The solving of Riccati equations for large-scale systems with symmetric circulant structure', Kongzhi Lilun Yu Yingyong/Control Theory and Applications, vol. 15, no. 1.
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This paper discusses the solving of the algebraic Riccati equations and the Lyapunov matrix equations for large-scale systems with symmetric circulant structure. It is shown that the solving of the algebraic Riccati equations and the Lyapunov matrix equations for such a system can be simplified by solving N/2+1 independent equations of dimension N times smaller than the original equations. As an application, the problems of the linear quadratic optimal control and the robust linear quadratic optimal control for such a system can also be simplified.
Huynh, BP 1998, 'A NUMERICAL INVESTIGATION OF NON-ISOTHERMAL EXTRUSION THROUGH ANNULAR DIES', International Journal of Engineering Science, vol. 36, no. 2, pp. 171-188.
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Indraratna, B & Redana, IW 1998, 'Development of the smear zone around vertical band drains', Proceedings of the Institution of Civil Engineers - Ground Improvement, vol. 2, no. 4, pp. 165-178.
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This study describes the effect of smear on the settlements of soft clay foundations which have been improved by installation of vertical drains. The smear zone propagation around a band-shaped drain was monitored using a large, radial drainage consolidometer. The test results reveal that a significant reduction in the horizontal permeability takes place towards the central drain, whereas the vertical permeability remains relatively unchanged. The estimated smear zone was about 3–4 times the cross-section area of the band-shaped drain (mandrel). In the analysis, the classical axisymmetric solution for consolidation by vertical drain has been converted into an equivalent 2D plane strain analysis. The plain strain model is subsequently applied to a number of embankments stabilized with vertical drains. It is revealed that the inclusion of smear effects improves the settlement prediction significantly.
Indraratna, B & Redana, IW 1998, 'Laboratory Determination of Smear Zone due to Vertical Drain Installation', Journal of Geotechnical and Geoenvironmental Engineering, vol. 124, no. 2, pp. 180-184.
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INDRARATNA, B, HAQUE, A & AZIZ, N 1998, 'Laboratory modelling of shear behaviour of soft joints under constant normal stiffness conditions', Geotechnical and Geological Engineering, vol. 16, no. 1, pp. 17-44.
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Shear behaviour of regular sawtooth rock joints produced from casting plaster are investigated under constant normal stiffness (CNS) conditions. Test results obtained in this investigation are also compared with the constant normal load (CNL) tests. It is observed that the peak shear stress obtained under CNL conditions always underestimates the peak shear stress corresponding to the CNS condition. Plots of shear stress against normal stress show that a nonlinear (curved) strength envelope is acceptable for soft rock joints subjected to a CNS condition, in comparison with the linear or bilinear envelopes often proposed for a CNL condition. Models proposed by Patton (1966) and Barton (1973) have also been considered for the predictions of peak shear stress of soft joints under CNS conditions. Although Patton's model is appropriate for low asperity angles, it overestimates the shear strength in the low to medium normal stress range at higher asperity angles. In contrast, while Barton's model is realistic for the CNL condition, it seems to be inappropriate for modelling the shear behaviour of soft joints under CNS conditions. The effect of infill material on the shear behaviour of the model joints is also investigated, and it is found that a small thickness of bentonite infill reduces the peak stress significantly. The peak shear stress almost approached that of the shear strength of infill when the infill thickness to asperity height ratio (t/a) reached 1.40. This paper also introduces an original, empirical shear strength envelope to account for the change in normal stress and surface degradation during CNS shearing.
Indraratna, B, Ionescu, D & Christie, HD 1998, 'Shear Behavior of Railway Ballast Based on Large-Scale Triaxial Tests', Journal of Geotechnical and Geoenvironmental Engineering, vol. 124, no. 5, pp. 439-449.
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Jin, H, Miyanaga, Y & Tochinai, K 1998, 'On the optimum design of cluster structures by using a genetic algorithm', Electronics and Communications in Japan (Part II: Electronics), vol. 81, no. 3, pp. 53-63.
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Kandasamy, JK & Melville, BW 1998, 'Maximum local scour depth at bridge piers and abutments', JOURNAL OF HYDRAULIC RESEARCH, vol. 36, no. 2, pp. 183-198.
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Keenan, T, Glasson, K, Cummings, F, Bird, TS, Keeler, J & Lutz, J 1998, 'The BMRC/NCAR C-Band Polarimetric (C-POL) Radar System', Journal of Atmospheric and Oceanic Technology, vol. 15, no. 4, pp. 871-886.
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Keenan, T, Glasson, K, Cummings, F, Bird, TS, Keeler, J & Lutz, J 1998, 'The BMRC/NCAR C-band polarimetric (C-POL) radar system', Journal of Atmospheric and Oceanic Technology, vol. 15, no. 4, pp. 871-886.
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The development of the first Australian C-band polarimetric/Doppler meteorological radar system (C-POL) is described. Motivated by the need to obtain improved rainfall estimation and the vertical profile of hydrometeors, C-POL was developed jointly by the Bureau of Meteorology (BOM), the Commonwealth Scientific and Industrial Research Organisation of Australia, and the National Center for Atmospheric Research. C-POL is based on a standard operational C-band radar employed by the BOM but modified to be capable of transmitting linear horizontal and vertical polarizations and receiving the co- and cross polarizations on a pulse-to-pulse basis. Standard variables extracted include horizontal reflectivity (ZHH), radial velocity (Vr), spectral width (συ), differential reflectivity (ZDR), differential phase shift (ΦDP), and zero lag correlation coefficient [ρHV(0)]. With the addition of a second receiver chain, the linear depolarization ratio will soon be available. Initial results with the radar are discussed to give examples of the data quality, as well as some of the problems inherent in using a C-band radar in the Tropics.
Kenney, TC, Reddi, LN & Indraratna, B 1998, 'Discussions and Closure: Analytical Model for Particle Migration within Base Soil-Filter System', Journal of Geotechnical and Geoenvironmental Engineering, vol. 124, no. 10, pp. 1044-1047.
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Kermode, RG 1998, 'Scoped hybrid automatic repeat reQuest with forward error correction (SHARQFEC)', ACM SIGCOMM Computer Communication Review, vol. 28, no. 4, pp. 278-289.
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Reliable multicast protocols scale only as well as their ability to localize traffic. This is true for repair requests, repairs, and the session traffic that enables receivers to suppress extraneous requests and repairs. We propose a new reliable multicast traffic localization technique called Scoped Hybrid Automatic Repeat reQuest with Forward Error Correction (SHARQFEC). SHARQFEC operates in an end-to-end fashion and localizes traffic using a hierarchy of administratively scoped regions. Session traffic is further reduced through the use of a novel method for indirectly determining the distances between session members. For large sessions, this mechanism reduces the amount of session traffic by several orders of magnitude over non-scoped protocols such as Scalable Reliable Multicast (SRM). Forward Error Correction is selectively added to regions which are experiencing greater loss, thereby reducing the volume of repair traffic and recovery times. Receivers request additional repairs as necessary. Simulations show that SHARQFEC out performs both SRM and non-scoped hybrid Automatic Repeat reQuest / Forward Error Correction protocols. Assuming the widespread deployment of administrative scoping, SHARQFEC could conceivably provide scalable reliable delivery to tens of millions of receivers without huge increases in network bandwidth.
Khalili, N & Khabbaz, MH 1998, 'A unique relationship for χ for the determination of the shear strength of unsaturated soils', Géotechnique, vol. 48, no. 5, pp. 681-687.
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Kolakowski, LF, O'Neill, GP, Howard, AD, Broussard, SR, Sullivan, KA, Feighner, SD, Sawzdargo, M, Nguyen, T, Kargman, S, Shiao, L-L, Hreniuk, DL, Tan, CP, Evans, J, Abramovitz, M, Chateauneuf, A, Coulombe, N, Ng, G, Johnson, MP, Tharian, A, Khoshbouei, H, George, SR, Smith, RG & O'Dowd, BF 1998, 'Molecular Characterization and Expression of Cloned Human Galanin Receptors GALR2 and GALR3', Journal of Neurochemistry, vol. 71, no. 6, pp. 2239-2251.
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Galanin is a 29- or 30-amino acid peptide with wide-ranging effects on hormone release, feeding behavior, smooth muscle contractility, and somatosensory neuronal function. Three distinct galanin receptor (GALR) subtypes, designated GALR1,2, and 3, have been cloned from the rat. We report here the cloning of the human GALR2 and GALR3 genes, an initial characterization of their pharmacology with respect to radioligand binding and signal transduction pathways, and a profile of their expression in brain and peripheral tissues. Human GALR2 and GALR3 show, respectively, 92 and 89% amino acid sequence identity with their rat homologues. Radioligand binding studies with 125I-galanin show that recombinant human GALR2 binds with high affinity to human galanin (K(D) = 0.3 nM). Human GALR3 binds galanin with less affinity (IC50 of 12 nM for porcine galanin and 75 nM for human galanin). Human GALR2 was shown to couple to phospholipase C and elevation of intracellular calcium levels as assessed by aequorin luminescence in HEK-293 cells and by Xenopus melanophore pigment aggregation and dispersion assays, in contrast to human GALR1 and human GALR3, which signal predominantly through inhibition of adenylate cyclase. GALR2 mRNA shows a wide distribution in the brain (mammillary nuclei, dentate gyrus, cingulate gyrus, and posterior hypothalamic, supraoptic, and arcuate nuclei), and restricted peripheral tissue distribution with highest mRNA levels detected in human small intestine. In comparison, whereas GALR3 mRNA was expressed in many areas of the rat brain, there was abundant expression in the primary olfactory cortex, olfactory tubercle, the islands of Calleja, the hippocampal CA regions of Ammon's horn, and the dentate gyrus. GALR3 mRNA was highly expressed in human testis and was detectable in adrenal gland and pancreas. The genes for human GALR2 and 3 were localized to chromosomes 17q25 and 22q12.2-13.1, respectively.
Krunz, M, Zhao, W & Matta, I 1998, 'Scheduling and bandwidth allocation for the distribution of archived video in VOD systems', Telecommunication Systems, vol. 9, no. 3/4, pp. 335-355.
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Krunz, MM & Makowski, AM 1998, 'Modeling video traffic using M/G/∞ input processes: a compromise between Markovian and LRD models', IEEE Journal on Selected Areas in Communications, vol. 16, no. 5, pp. 733-748.
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Kwon, D & Vigneswaran, S 1998, 'Influence of particle size and surface charge on critical flux of crossflow microfiltration', Water Science and Technology, vol. 38, no. 4-5, pp. 481-488.
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The effect of particle size and ionic strength of the feed suspension on critical flux was studied. The critical flux was defined in two different ways (strong and mild definition). The fouling, the increase of resistance (which is the basis of the mild definition of the critical flux) was relatively sensitive to the deposition of particles of 0.46 μm on the membrane of 0.2 μm mean pore. On the other hand, the deposition of large particles of 3.2 μm to a certain value on the membrane surface of 0.2 μm mean pore did not lead to the increase in resistance. In case of 11.9 μm particles, the transmembrane pressure did not increase even with significant amount of deposition of particles. The ionic strength of suspension had significant effect on the critical flux. For an ionic strength less than 1Ã10â1.5 M, there was a decrease in the critical flux. This could be due to the dense layer of deposit which is the result of less diffuse layer thickness of particles. Above this ionic strength, a significant increase in critical flux was noticed which may be due to the aggregation of particles.
Lakatos, L, Hutvágner, G & Bánfalvi, Z 1998, 'Potato protein kinase StCPK1: a putative evolutionary link between CDPKs and CRKs', Biochimica et Biophysica Acta (BBA) - Gene Structure and Expression, vol. 1442, no. 2-3, pp. 101-108.
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Calcium-dependent protein kinases (CDPKs) in plants are characterized by a four-domain structure including conserved sequences in the catalytic domain, and in the C-terminal calmodulin-like domain. Based on this conservation we have PCR amplified and iso
Lal, SKL, Henderson, RJ, Carter, N, Bath, A, Hart, MG, Langeluddecke, P & Hunyor, SN 1998, 'Effect of feedback signal and psychological characteristics on blood pressure self-manipulation capability', Psychophysiology, vol. 35, no. 4, pp. 405-412.
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Blood pressure presentation mode and personality are likely to influence biofeedback outcome. Thirty-six normotensive subjects were randomly assigned to visual or auditory continuous systolic feedback. Distracting speech and broad band noise were also su
Li, H, Fane, AG, Coster, HGL & Vigneswaran, S 1998, 'Direct observation of particle deposition on the membrane surface during crossflow microfiltration', Journal of Membrane Science, vol. 149, no. 1, pp. 83-97.
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In the crossflow microfiltration of particles, a deposit cake layer tends to form on the membrane and this usually controls the performance of the filtration process. This paper presents observations of particle deposition on membrane surfaces using a non-invasive, in situ, continuous direct observation through the membrane (DOTM) technique. The particles used in the experiments were typical of microfiltration processes, yeast (mean diameter 5 μm) and latex beads (3, 6.4 and 12 μm). The filtration tests were conducted in the imposed flux mode, so that the flux could be controlled at, below, or above the âcritical fluxâ. Below the critical flux, the particle deposition was negligible; near the critical flux the particle deposition was significant; and above the critical flux, particle layers were formed on the membrane surface. Rolling of the particles was observed during the filtration of 6.4 μm latex near the critical flux whereas a flowing cake layer was observed during the filtration of 3 μm latex. The particle size distribution of the deposited particles changed with the crossflow velocity, with smaller particles deposited on the membrane at higher crossflow velocity. Comparison of the normalised flux (J/ÎP) with the membrane area coverage by the particles revealed that for filtration of latex particles âflux percentage (with respect to the clean membrane)â was marginally greater than the percentage of uncovered membrane area, whereas for filtration of yeast, the âflux percentageâ was significantly less than the uncovered area percentage due to the deposition of smaller cell debris species. This paper demonstrates that DOTM is a powerful technique for the study of fundamentals of particle deposition and interactions between the particles and the membrane.
Li, QS, Fang, JQ, Liu, DK & Jeary, AP 1998, 'Vibration analysis of tall buildings with narrow rectangular plane configuration', Structural Design of Tall Buildings, vol. 7, no. 4, pp. 307-322.
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In this paper, tall buildings of narrow rectangular plane configuration are treated as one-step or multi-step cantilever flexural-shear plates for the analysis of their free vibrations. The governing differential equations for the vibration of flexural-shear plates considering the effects of both flexural and shear deformation are established. The general solutions for one-step flexural-shear plates are derived and used to obtain the eigenvalue equation for multi-step cantilever flexural-shear plates. A new exact approach is presented which combines the transfer matrix method and a closed-form solution for a uniform flexural-shear plate. A numerical example demonstrates that the calculated natural frequencies and mode shapes of a tall building are in good agreement with the experimentally measured data. It is also shown that the effect of shear deformation on the fundamental natural frequency can be ignored, but its effect on the higher natural frequencies should be considered. © 1998 John Wiley & Sons, Ltd.
LIN, C-T, JOU, C-P & LIN, C-J 1998, 'GA-based reinforcement learning for neural networks', International Journal of Systems Science, vol. 29, no. 3, pp. 233-247.
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Lu, RQ & Ying, MS 1998, 'A model of reasoning about knowledge', SCIENCE IN CHINA SERIES E-TECHNOLOGICAL SCIENCES, vol. 41, no. 5, pp. 527-534.
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A modal logical language and its Kripke semantics and Aumann semantics are introduced. A complete for mal deduction system is established to describe reasoning about knowledge in multi-agent systems involving different languages, and an institution of lo
McGloin, D, Simpson, NB & Padgett, MJ 1998, 'Transfer of orbital angular momentum from a stressed fiber-optic waveguide to a light beam', Applied Optics, vol. 37, no. 3, pp. 469-469.
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Nguyen, TV, Eisman, JA, Mizunuma, H & Okano, H 1998, 'Does Postmenopausal Bone Loss Occur in Two Phases?', Journal of Bone and Mineral Research, vol. 13, no. 8, pp. 1350-1351.
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Nguyen, TV, Howard, GM, Kelly, PJ & Eisman, JA 1998, 'Bone Mass, Lean Mass, and Fat Mass: Same Genes or Same Environments?', American Journal of Epidemiology, vol. 147, no. 1, pp. 3-16.
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Nguyen, TV, Sambrook, PN & Eisman, JA 1998, 'Bone Loss, Physical Activity, and Weight Change in Elderly Women: The Dubbo Osteoporosis Epidemiology Study', Journal of Bone and Mineral Research, vol. 13, no. 9, pp. 1458-1467.
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O'Dowd, BF, Nguyen, T, Marchese, A, Cheng, R, Lynch, KR, Heng, HHQ, Kolakowski, LF & George, SR 1998, 'Discovery of Three Novel G-Protein-Coupled Receptor Genes', Genomics, vol. 47, no. 2, pp. 310-313.
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We report here the molecular cloning, tissue distribution, and chromosomal localization of novel genes encoding G-protein-coupled receptors (GPCRs). A search of a mouse database of expressed sequence tags revealed an EST partially encoding a GPCR, which was used to screen a mouse genomic library to obtain the translational open reading frame (ORF). The resultant clone, GPR27, contained an intronless ORF, encoding a receptor of 379 amino acids. In an alternate strategy, human genomic DNA was subjected to polymerase chain reaction (PCR) amplification, using degenerate oligonucleotides based on GPR1. Two PCR products partially encoding GPCRs were isolated and used to screen a genomic library to obtain the translational ORF. One of the resultant clones, GPR30, contained an intronless ORF encoding a receptor of 375 amino acids. The other clone, GPR35, also contained an intronless ORF encoding a receptor of 309 amino acids. Transcripts corresponding to GPR27 and GPR30 were detected in several areas of human and rat CNS, while GPR35 expression was detected only in the rat intestine. Through fluorescence in situ hybridization analysis the gene encoding GPR30 was localized to chromosome 7p22 and GPR35 to chromosome 2q37.3.
Ono, E, Hosoe, S, Hoang D. Tuan & Doi, S 1998, 'Bifurcation in vehicle dynamics and robust front wheel steering control', IEEE Transactions on Control Systems Technology, vol. 6, no. 3, pp. 412-420.
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Oppermann, I & Grant, C 1998, 'Performance of a CDMA System with an Adaptive Receiver and a New Family of Complex Valued Spreading Sequences', Wireless Personal Communications, vol. 7, no. 2/3, pp. 111-134.
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This paper presents the results of a capacity evaluation for a direct-sequence (DS), code-division, multiple access (CDMA) system over both an additive white Gaussian noise (AWGN) channel and a Rayleigh fading channel. The system considered uses an adaptive receiver. The performance of sets of sequences from various binary and complex valued families is examined. The performance of the system is measured in terms of the total efficiency, and it is shown that the new sequence sets offer higher system capacity and lower signal-to-noise power spectral density ratios.
Oppermann, I, van Rooyen, P & Vucetic, B 1998, 'Effect of sequence selection on MAI suppression in limited spreading CDMA systems', Wireless Networks, vol. 4, no. 6, pp. 471-478.
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Parfitt, AJ & Bird, TS 1998, 'Computation of aperture antenna mutual coupling using FDTD and Kirchhoff field transformation', Electronics Letters, vol. 34, no. 12, pp. 1167-1167.
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Parry, JJ, Burnett, IS & Chicharo, JF 1998, 'USING LINGUISTIC KNOWLEDGE TO IMPROVE THE DESIGN OF LOW-BIT RATE LSF QUANTISATION', 5th International Conference on Spoken Language Processing, ICSLP 1998, vol. 6, pp. 2599-2602.
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In this paper we investigate an alternative approach to the design of low-bit rate (LBR) quantisation. This approach incorporates phonetic information into the structure of Line Spectral Frequency (LSF) codebooks. In prior work vector quantisation (VQ) has been used to quantise stochastic processes. Speech signals can, however, be described in terms of phonetic segments and linguistic rules. A trained LSF codebook, like the phonetic inventory of a language, is a static description of spectral behaviour of speech. As clear relationships exist between phonetic segments and LSFs the structure of an LSF codebook can be analysed in terms of the phonetic segments. The investigation leads to the conclusion that phonetic information can be usefully employed in codebook training in terms of perceptual performance and bit-rate reductions.
Randell, AG, Bhalerao, N, Nguyen, TV, Sambrook, PN, Eisman, JA & Silverman, SL 1998, 'Quality of life in osteoporosis: reliability, consistency, and validity of the Osteoporosis Assessment Questionnaire.', J Rheumatol, vol. 25, no. 6, pp. 1171-1179.
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OBJECTIVE: To determine the reliability, consistency, and clinical utility of the Osteoporosis Assessment Questionnaire (OPAQ), an AIMS2 based self-assessment questionnaire. METHODS: Reliability of individual questions, scales, and domains were evaluated in 40 subjects by test-retest and intraclass correlation coefficients and internal consistency by Cronbach's alpha. Construct validity was evaluated by disease state. The relationships between domains and scales were modeled by confirmatory factor analysis. RESULTS: Mean kappa (79 questions) and intraclass correlation (18 health scales) coefficients were 0.58+/-0.16 (mean+/-SD) and 0.82+/-0.07, respectively. Internal consistency was greater than 0.8 in all but 3 scales. Construct validity was confirmed. Patients with hip fracture recorded lower OPAQ scores than patients with vertebral fracture. Correlation and confirmatory factor analyses grouped the 18 health scales into 7 domains. CONCLUSION: These findings suggest that OPAQ is a reliable, consistent, and valid instrument capable of distinguishing hierarchy of functional loss in disease states in osteoporosis.
Saban, D & Braun, RM 1998, 'Multi-carrier direct sequence CDMA in fading situations', Proceedings of the 1998 South African Symposium on Communications and Signal Processing-COMSIG '98 (Cat. No. 98EX214), pp. 33-38.
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Saban, G & Braun, RM 1998, 'Wireless local loop and packet radio technology for developing communities', Proceedings of the 1998 South African Symposium on Communications and Signal Processing-COMSIG '98 (Cat. No. 98EX214), pp. 1-6.
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Seaman, B & Braun, RM 1998, 'Using cyclostationarity in the modulation classification of analogue signals', Proceedings of the 1998 South African Symposium on Communications and Signal Processing-COMSIG '98 (Cat. No. 98EX214), pp. 261-266.
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Shannon, AG 1998, 'Incompatibility of insulin pens and cartridges', LANCET, vol. 351, no. 9105, pp. 833-833.
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Simpson, NB, McGloin, D, Dholakia, K, Allen, L & Padgett, MJ 1998, 'Optical tweezers with increased axial trapping efficiency', Journal of Modern Optics, vol. 45, no. 9, pp. 1943-1949.
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Sleiman, RJ, Catchpoole, DR & Stewart, BW 1998, 'Drug-induced death of leukaemic cells after G2/M arrest: higher order DNA fragmentation as an indicator of mechanism', British Journal of Cancer, vol. 77, no. 1, pp. 40-50.
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Many reports have documented apoptotic death in different cell types within hours of exposure to cytotoxic drugs; lower drug concentrations may cause cell cycle arrest at G2/M and subsequent death, which has been distinguished from 'classic' apoptosis. We have analysed etoposide-induced cell death in two lymphoblastoid T-cell lines, CCRF-CEM and MOLT-4, specifically in relation to DNA cleavage as indicated by pulse-field gel and conventional electrophoresis. High (5 μM) concentration etoposide causes 50-kb cleavage of DNA that occurs at the same time as apoptotic morphology and internucleosomal cleavage. At lower concentrations (0.5-0.05 μM), sequential change may be discerned with altered gene expression being similar to that at high dose, but preceding cell cycle arrest and 50-kb cleavage. These last changes, in turn, clearly precede internucleosomal fragmentation of DNA, vital dye staining and morphological evidence cell death. The pattern of higher order fragmentation constitutes a sensitive indicator of commitment to cell death in these cells. Morphological evidence of cell death is associated with internucleosomal fragmentation in one of the lines, but the pattern of 50-kb DNA cleavage provides the clearest evidence of commonality in death processes occurring at low and high drug concentration.
Sriwongsitanon, N, Ball, JE & Cordery, I 1998, 'An investigation of the relationship between the flood wave speed and parameters in runoff-routing models', HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES, vol. 43, no. 2, pp. 197-213.
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Stewart, MG & Rosowsky, DV 1998, 'Time-dependent reliability of deteriorating reinforced concrete bridge decks', Structural Safety, vol. 20, no. 1, pp. 91-109.
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A structural deterioration reliability model is developed to calculate probabilities of structural failure (flexure) for a typical reinforced concrete continuous slab bridge. Corrosion may be initiated from the application of de-icing salts or atmospheric exposure in a marine environment. It is assumed that corrosion will lead to a reduction in the cross-sectional area of the reinforcing steel. Monte Carlo simulation is used to calculate probabilities of failure for annual increments over the lifetime of the structure (75 years). The application of de-icing salts or atmospheric marine exposure is shown to cause significant long-term deterioration and reduction in structural safety. Reducing the cover from that currently specified for design results in a significant increase in failure probabilities. © 1998 Elsevier Science Ltd. All rights reserved.
Sundaravadivel, M, Doeleman, JA & Vigneswaran, S 1998, 'Combined surface sewerage: a low-cost option for effective sanitation in semi-urban areas of India', Environmental Engineering and Policy, vol. 1, no. 3, pp. 181-189.
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Current prescriptions for sanitation technologies in developing countries are predominantly in the context of either large cities or rural areas. In India, however, there are a large number of small cities and towns with population in the range of 20000±100000 that account for over 50 million of the country's urban population. This paper discusses the inappropriateness (in terms of techno-economic viability and environmental desirability) of commonly recommended on-site sanitation technologies and capital intensive conventional sewage collection systems for these `semi-urban' areas. While emphasising the need for a different approach for provision of sanitation services to such cities and towns, it identifies the limitations of recent developments of non-conventional sewerage systems. Based on the field research carried out in four `semi-urban' towns in India, the paper proposes the concept of `combined surface sewerage' that can utilise existing infrastructure to a maximum to effect better sanitation at lower costs. The suggested system involves converting the existing open drains on the roadsides, as decentralized networks with simple structural modifications and covering them with concrete slabs. These decentralized networks would convey sullage, septic tank overflow and storm water run-off for appropriate low-cost treatment prior to disposal.
Tellambura, C, Guo, YJ & Barton, SK 1998, 'Channel estimation using aperiodic binary sequences', IEEE Communications Letters, vol. 2, no. 5, pp. 140-142.
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Estimating a channel impulse response using a known aperiodic sequence is considered. The problem can be reduced to minimizing the trace of the inverse of a Toeplitz matrix. An efficient algorithm for computing this trace is developed and optimal binary sequences up to length 32 are found and tabulated. The use of complementary sequences in this context is also investigated. It is shown that the eigenvalues of the autocorrelation matrices of a pair of complementary sequences sum to a known constant.
Tews, A & Lister, R 1998, 'Self-organisation in a simple pursuit game', Complexity International, vol. 6.
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This paper concerns dynamic team formation in multi-agent systems, where each agent determines its own action by observing the other agents. The test bed is a simple pursuit game. Identical mobile agents learn to form teams to most effectively catch individual stationary targets. The decision-making component is not manually encoded, but instead it self-learns, without an external teacher, by the method of temporal differences. Agents do not negotiate, nor do they explicitly form or communicate commitments. Instead, agents determine their own actions by a behaviourist approach: they reason only from the relative positions of other agents, not from an interpretation of the intent of those other agents. Experimental results demonstrate that the agents do coordinate their activities, by forming teams, In this paper, self-organisation is manifested in three forms: the formation of teams by the pursuer agents, the temporal difference algorithm by which agents learn to cooperate, and in the representation of the learnt knowledge as the weights in a perception.
Tipper, JL, Ingham, E, Cove, JH, Todd, NJ & Kerr, KG 1998, 'Survival and multiplication of Burkholderia cepacia within respiratory epithelial cells', Clinical Microbiology and Infection, vol. 4, no. 8, pp. 450-459.
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Objective: To investigate the ability of both clinical and environmental strains of Burkholderia cepacia, along with control strains of Pseudomonas aeruginosa and Escherichia coli, to invade a respiratory epithelial cell line, A549. Methods and Results: Using a double immunofluorescence labeling technique, a clinical strain of B. cepacia, C1359, and the clonally related strains A509 and J2315, were shown to invade A549 cells at a high level (2-8% A549 cells invaded) compared to environmental strains of B. cepacia NCTC 10661 and NCTC 10743 (0.5-1% of A549 cells invaded). Control strains of P. aeruginosa PAO1 and E. coli C600 did not appear to be able to invade respiratory epithelial cells using this method. Ceftazidime protection assays revealed that B. cepacia C1359 and NCTC 10743 were able to survive and multiply within A549 cells for > 24 h. In contrast, B. cepacia NCTC 10661, P. aeruginosa PAO1 and E. coli C600 failed to multiply within A549 cells, showing a significant decrease in numbers after 24 h. Conclusions: The ability to survive and multiply within respiratory epithelial cells may be an important virulence factor of B. cepacia infection in cystic fibrosis.
Tran, TS, Jamulitrat, S, Chongsuvivatvong, V & Geater, A 1998, 'Postoperative hospital-acquired infection in Hungvuong Obstetric and Gynaecological Hospital, Vietnam', Journal of Hospital Infection, vol. 40, no. 2, pp. 141-147.
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Val, DV, Stewart, MG & Melchers, RE 1998, 'Effect of reinforcement corrosion on reliability of highway bridges', Engineering Structures, vol. 20, no. 11, pp. 1010-1019.
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This paper presents several aspects of a method for reliability assessment of reinforced concrete (RC) slab bridges with corroded reinforcement. It is assumed that corrosion will lead to a reduction in cross-sectional area of the reinforcing steel and/or a reduction in bond strength. Two types of corrosion are considered: general and localized corrosion. The method includes a non-linear finite element structural model and probabilistic models for traffic loads, corrosion propagation, bond characteristics, material properties, element dimensions and reinforcement placement. Reliability is estimated in terms of the reliability index using the first-order reliability method (FORM). For illustrative purposes, bridge reliabilities are calculated for a deteriorating, simple-span RC slab bridge, for ultimate strength and serviceability limit states.
van Rooyen, P, Kohno, R & Oppermann, I 1998, 'DS-CDMA performance with maximum ratio combining and antenna arrays', Wireless Networks, vol. 4, no. 6, pp. 479-488.
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Voinov, AA 1998, 'Paradoxes of sustainability', Zhurnal Obshchei Biologii, vol. 59, no. 2, pp. 209-218.
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Some problems and controversies of sustainability are treated within the framework of system analysis. It seems difficult to reconcile the concept of sustainability with such system categories as hierarchy and cycling.
Voinov, AA, Fitz, HC & Costanza, R 1998, 'Surface water flow in landscape models:', Ecological Modelling, vol. 108, no. 1-3, pp. 131-144.
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Wang, Y-J & Lin, C-T 1998, 'A second-order learning algorithm for multilayer networks based on block Hessian matrix', Neural Networks, vol. 11, no. 9, pp. 1607-1622.
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Yi-Jen Wang & Chin-Teng Lin 1998, 'Runge-Kutta neural network for identification of dynamical systems in high accuracy', IEEE Transactions on Neural Networks, vol. 9, no. 2, pp. 294-307.
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Ying, MS 1998, 'Compactness in fuzzy logic', CHINESE SCIENCE BULLETIN, vol. 43, no. 14, pp. 1166-1171.
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Compactness in Pavelka's fuzzy logic for some compact lattices of truth values is shown, and the concept of gradual compactness is introduced to establish some corresponding results in a more general setting.
Ying, MS & Bouchon-Meunier, B 1998, 'Approximate reasoning with linguistic modifiers', INTERNATIONAL JOURNAL OF INTELLIGENT SYSTEMS, vol. 13, no. 5, pp. 403-418.
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We analyze the influence of some usual linguistic modifiers, such as scalar product, normalization, Bouchon-Meunier modifiers, perturbation, and (weakening and reinforcement) power, in the process of approximate reasoning and clarify the difference betwe
Zhou, JL, Fileman, TW, Evans, S, Donkin, P, Llewellyn, C, Readman, JW, Mantoura, RFC & Rowland, SJ 1998, 'Fluoranthene and pyrene in the suspended particulate matter and surface sediments of the Humber Estuary, UK', Marine Pollution Bulletin, vol. 36, no. 8, pp. 587-597.
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Zhou, JL, Huang, PL & Lin, RG 1998, 'Sorption and desorption of Cu and Cd by macroalgae and microalgae', Environmental Pollution, vol. 101, no. 1, pp. 67-75.
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Zhu, JG & Ramsden, VS 1998, 'Improved formulations for rotational core losses in rotating electrical machines', IEEE TRANSACTIONS ON MAGNETICS, vol. 34, no. 4, pp. 2234-2242.
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This paper presents the measurement and modeling of rotational core losses in electrical steel sheets and rotating electrical machines. Novel formulations of rotational hysteresis, eddy current, and excess losses in electrical sheet steels with circular
Zoysa, AKN, Loganathan, P & Hedley, MJ 1998, 'Effect of forms of nitrogen supply on mobilisation of phosphorus from a phosphate rock and acidification in the rhizosphere of tea', AUSTRALIAN JOURNAL OF SOIL RESEARCH, vol. 36, no. 3, pp. 373-387.
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Nitrogen (N) is the main fertiliser input to tea plantations because of the large removal of this element with regular harvests of young shoots in the field. The form of N supply is known to influence the uptake of other plant nutrients, notably phosphorus (P), through its effect on soil pH in the rhizosphere. A glasshouse study was conducted to test the effect of N form (NH4/+, NO3/-, or both) on the transformation of soil P in the rhizosphere and its availability to tea (Camellia sinensis L.) plants fertilised with sparingly soluble Eppawala phosphate rock (EPR). Four-month-old tea (TRI 2025) plants were grown in rhizosphere study containers containing an Ultisol from Sri Lanka (pH 4.5 in water) amended with EPR and KCl at 200 μg P or K/g soil, and mixed with (NH4)2SO4 (100% NH4/+-N), NH4NO3 (50% NH4/+-N and 50% NO3/--N), and Ca(NO3)2 (100% NO3/--N) at the rate of 200 μg N/g soil, with a control (no N fertiliser), as treatments. Rhizosphere pH decreased compared with the bulk soil when N was supplied as NH4/+ or NH4/+-NO3/- forms, and increased when N was supplied as NO3/-. The cation-anion balance estimations in the plants showed that the plants had taken up more NO3/- than NH4/+ even in (NH4)2SO4 treated soil, suggesting high nitrification rates, especially in the rhizosphere, in spite of using a nitrification inhibitor. More EPR dissolved in the rhizosphere compared with that in the bulk soil, regardless of the N form applied. The (NH4)2SO4 treatment had the highest dissolution rate of EPR in the rhizosphere, whereas Ca(NO3)2 treatment had the lowest, reflecting the degree of acidification in the rhizosphere. Resin-P and NaOH-P(i) (inorganic P) concentrations were lower and NaOH-P(o) (organic P) concentration was higher in the rhizosphere than in the bulk soil. Plant and possible microbial uptake of P is the main reason for the decrease in resin-P and NaOH-P(i). The increase in NaOH-P(o) concentration in the rhizosphere is believed to be due to transformatio...
Zoysa, AKN, Loganathan, P & Hedley, MJ 1998, 'Phosphate rock dissolution and transformation in the rhizosphere of tea (Camellia sinensis L.) compared with other plant species', EUROPEAN JOURNAL OF SOIL SCIENCE, vol. 49, no. 3, pp. 477-486.
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Tea (Camellia sinensis L.) is generally grown in highly weathered acidic Ultisols of the humid tropics. The low pH, large P fixing capacity and moisture content of these soils favour the dissolution of phosphate rock. Plant species differ widely in their ability to take up P from phosphate rock, and we have compared phosphate mobilization in the rhizosphere of tea with that under calliandra (Calliandra calothyrsus L.), Guinea grass (Panicum maximum L.) and bean (Phaseolus vulgaris L.) by studying the changes in the concentration of P fractions at known distances from the root surface in an acidic (pH in water 4.5) Ultisol from Sri Lanka treated with a phosphate rock. Plants were grown in the top compartment of a two-compartment device, comprising two PVC cylinders physically separated by a 24-μm pore-diameter polyester mesh. A planar mat of roots was formed on the mesh in the top compartment, and the soil on the other side of the mesh in the lower compartment was cut into thin slices parallel to the rhizosphere and analysed for pH and P fractions. All plant species acidified the rhizosphere (pH [water] difference between bulk and rhizosphere soils was 0.17-0.26) and caused more rock to dissolve in the rhizosphere (10-18%) than in the bulk soil (8-11%). Guinea grass was most effective, though the rate of acidification per unit root surface area was least (0.02 μmol H+ cm-2) among the four species. Tea produced the largest rate of acidification per unit root surface area (0.08 μmol H+ cm-2). All species depleted P extracted by a cation-anion exchange resin and inorganic P extracted by 0.1 m NaOH. All except tea depleted organic P extracted by 0.1 m NaOH in the rhizosphere. The external P efficiencies (mg total P uptake) of Guinea grass, bean, tea and calliandra in soil fertilized with phosphate rock were 4.82 ± 0.42, 4.02 ± 0.32, 1.06 ± 0.02 and 0.62 ± 0.02, respectively, and the corresponding internal P efficiencies (mg shoot dry matter production per mg plant P) ...
Alem, L 1970, 'Learning in the workplace: Initial requirements of a lessons learned centred corporate memory', INTELLIGENT TUTORING SYSTEMS, 4th International Conference on Intelligent Tutoring Systems (ITS 98), SPRINGER-VERLAG BERLIN, SAN ANTONIO, TEXAS, pp. 216-223.
Alem, L & Marcenac, P 1970, 'Management of worker's experiences: A knowledge-based approach', PRICAI'98: TOPICS IN ARTIFICIAL INTELLIGENCE, 5th Pacific Rim International Conference on Artificial Intelligence (PRICAI 98), SPRINGER-VERLAG BERLIN, SINGAPORE, SINGAPORE, pp. 216-227.
Andren, J, Hilding, M & Veitch, D 1970, 'Understanding end-to-end internet traffic dynamics', Global Telecommunications Conference, 1998. GLOBECOM 1998. The Bridge to Global Integration. IEEE, IEEE, pp. 1118-1122.
Banh, BAJ, Anido, GJ & Dutkiewicz, E 1970, 'Handover re-routing schemes for connection oriented services in mobile ATM networks', Proceedings. IEEE INFOCOM '98, the Conference on Computer Communications. Seventeenth Annual Joint Conference of the IEEE Computer and Communications Societies. Gateway to the 21st Century (Cat. No.98CH36169), IEEE INFOCOM'98 Conference on Computer Communications Seventeenth Annual Joint Conference of the IEEE Computer and Communications Societies Gateway to the 21st Century, IEEE, pp. 1139-1146.
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Wireless ATM (WATM) will be used to support broadband applications for future generation mobile services. To achieve this, the existing ATM protocol must be augmented with mobility management capabilities. One of the important components of mobility management is the ability of the network to seamlessly re-route existing connections to different parts of the network. To date, a number of schemes have been proposed for broadband wireless networks. These schemes can potentially be used in WATM networks. In this paper, we compare the performance of these schemes in terms of their complexity, handover latency, communication disruption period and buffer and bandwidth requirements.
Barattin, M, Cucchiara, R & Piccardi, M 1970, 'A Rule-based Vehicular Traffic Tracking System', Proceedings of the Joint Conference on Information Sciences, pp. 334-337.
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The paper presents a computer vision-based approach to the problem of vehicular traffic monitoring. The approach associates a high-level tracking system to a low-level system that performs moving vehicles detection. The high-level module is based on a large set of rules and is able to keep tracks of all moving or stopped vehicles along the image sequence.
Beydoun, G & Hoffmann, A 1970, 'Building Problem Solvers Based on Search Control Knowledge', 11th Knowledge Acquisition for Knowledge-Based Systems Workshop (KAW98), Canada.
Beydoun, G & Hoffmann, A 1970, 'Building Search Heuristics at The Knowledge Level', Pacific Rim Knowledge Acquisition Workshop (PKAW98).
Beydoun, G & Hoffmann, A 1970, 'Simultaneous modelling and knowledge acquisition using NRDR', PRICAI'98: TOPICS IN ARTIFICIAL INTELLIGENCE, 5th Pacific Rim International Conference on Artificial Intelligence (PRICAI 98), SPRINGER-VERLAG BERLIN, SINGAPORE, SINGAPORE, pp. 83-95.
Bird, TS 1970, 'Recent progress in reflector antenna analysis & design', 1998 Symposium on Antenna Technology and Applied Electromagnetics, 1998 Symposium on Antenna Technology and Applied Electromagnetics, IEEE, Ottawa, Canada, pp. 3-6.
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© 1998 IEEE. The latter part of the 20th century has seen significant changes and improvements in the design and practice of reflectorantennas. As well as traditional users of reflectors, such as defence, telecommunication utilities and radio astronomy, significant consumer markets have now opened up. For instance, it is common for many homes and offices to have a dish connected to a wall or roof. At the same time design techniques for reflectors and associated feed systems have also undergone change. Until a few years ago effectsthat were poorly modelled or completely ignored that can now be analysed include, reflectoredge diffraction, near-field effects, grid, composite and painted surfaces, accurate feed models, mutual coupling and scattering in feed arrays, and reflector/feedinteractions. Shaped reflectors are now widely used on satellite antennas, and dielectric-loaded horns are replacing corrugated horns in some earth station applications. It is the purpose here to outline some recent changes and improvements in the design and synthesis techniques used for reflectors and feeds.
Blumenstein, M & Verma, B 1970, 'A neural based segmentation and recognition technique for handwritten words', 1998 IEEE International Joint Conference on Neural Networks Proceedings. IEEE World Congress on Computational Intelligence (Cat. No.98CH36227), ICNN '98 - International Conference on Neural Networks, IEEE, pp. 1738-1742.
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Artificial Neural Networks (ANNs) have been successfully applied to Optical Character Recognition (OCR) yielding excellent results. In this paper a technique is presented that segments difficult printed and cursive handwriting, and then classifies the segmented characters. A conventional algorithm is used for the initial segmentation of the words, while an ANN is used to verify whether an accurate segmentation point has been found. After all segmentation points have been detected another NN is used to identify the characters which remain following the segmentation process. The C programming language, the SP2 supercomputer and a SUN workstation were used for the experiments. The technique has been tested on real-world handwriting scanned from various staff at Griffith University, Gold Coast. Some preliminary experimental results are presented in this paper.
Canning, J, Sceats, MG & Carter, ALG 1970, 'UV-induced structural changes in photosensitive optical fibres', JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, International Workshop on Structure and Functional Optical Properties of Silica and Silica-Related Glasses, JAPAN SOC APPLIED PHYSICS, TOYOTA MOTOR CORP, MIKKABI CREAT CTR, SHIZUOKA, JAPAN, pp. 59-61.
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Chia-Feng Juang & Chin-Teng Lin 1970, 'Genetic reinforcement learning through symbiotic evolution for fuzzy controller design', 1998 IEEE International Conference on Fuzzy Systems Proceedings. IEEE World Congress on Computational Intelligence (Cat. No.98CH36228), 1998 IEEE International Conference on Fuzzy Systems IEEE World Congress on Computational Intelligence, IEEE, ANCHORAGE, AK, pp. 1281-1285.
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Chilakapati, N, Ramsden, VS, Ramaswamy, V & Zhu, J 1970, 'Investigation of doubly fed twin stator induction motor as a variable speed drive', 1998 International Conference on Power Electronic Drives and Energy Systems for Industrial Growth, 1998. Proceedings., 1998 International Conference on Power Electronics Drives and Energy Systems for Industrial Growth, IEEE, Perth, Australia, pp. 160-165.
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Cucchiara, R & Piccardi, M 1970, 'Exploiting image processing locality in cache pre-fetching', Proceedings. Fifth International Conference on High Performance Computing (Cat. No. 98EX238), Proceedings. Fifth International Conference on High Performance Computing, IEEE Comput. Soc, CHENNAI, INDIA, pp. 466-472.
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Di Zenobio, D, Santella, G, Vucetic, B & Oppermann, I 1970, 'A comparative analysis of CABSINET/ACTS project uplink performance', IEEE GLOBECOM 1998 (Cat. NO. 98CH36250), IEEE GLOBECOM 1998, IEEE, SYDNEY, AUSTRALIA, pp. 2419-2424.
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Esselle, KP & Foroughipour, M 1970, 'Enhanced FD-TD equations for sharp, diagonal, metal edges at arbitrary angles', IEEE Antennas and Propagation Society International Symposium. 1998 Digest. Antennas: Gateways to the Global Network. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.98CH36194), IEEE Antennas and Propagation Society International Symposium. 1998 Digest. Antennas: Gateways to the Global Network. Held in conjunction with: USNC/URSI National Radio Science Meeting, IEEE, ATLANTA, GA, pp. 604-607.
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Funaki, K, Miyanaga, Y & Tochinai, K 1970, 'On robust speech analysis based on time-varying complex AR model', 5th International Conference on Spoken Language Processing (ICSLP 1998), 5th International Conference on Spoken Language Processing (ICSLP 1998), ISCA.
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We have already developed time-varying complex AR (TV-CAR) parameter estimation based on minimizing mean square error (MMSE) for analytic speech signal. Although the MMSE approach is commonly and successfully applied in various parameter estimation such as conventional LPC, it is well-known that an MMSE method easily suffers from biased and inaccurate spectrum estimation due to non-Gaussian nature of glottal excitation for voiced speech in the context of speech analysis. This paper offers robust parameter estimation algorithm for the TV-CAR model by applying Huber's robust M-estimation approach and two kinds of robust algorithms are derived: Newton-type algorithm and weighted least squares (WLS) algorithm. The preliminary experiments with synthetic signal generated by glottal source model excitation and natural speech uttered by female speaker demonstrate that the time-varying complex AR. method is sufficiently robust against non-Gaussian nature of glottal source excitation owing to the improved resolution in the frequency domain.
Gemmell, J, Schooler, E & Kermode, R 1970, 'A scalable multicast architecture for one-to-many telepresentations', Proceedings. IEEE International Conference on Multimedia Computing and Systems (Cat. No.98TB100241), IEEE International Conference on Multimedia Computing and Systems, IEEE Comput. Soc, AUSTIN, TX, pp. 128-139.
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Guo, Y, Zhu, J & Ramsden, VS 1970, 'Development of a Single Phase Claw Pole Permanent Magnet Motor Using Composite Soft Magnetic Material', Proceedings of Australasian Universities Power Engineering Conference, University of Tasmania, Australia, Hobart, Australia, pp. 659-664.
Guo, YJ, Vadgama, S, Davies, M, Khalab, J, Zarri, M & Spink, D 1970, 'Adaptive antenna for CDMA', IEEE International Symposium on Spread Spectrum Techniques & Applications, pp. 590-594.
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A decision directed adaptive antenna array for the uplink of CDMA cellular systems, which is based on a normalized least mean square algorithm (NLMS), is presented. The bit error ratio performance of the adaptive antenna in various scenarios, which include the use of transmission power control (TPC) and diversity combining, is studied. It is shown that the adaptive antenna outperforms the steering beam technique when the signal-to-noise ratio is large and the active users are clustered. However, the performance of the adaptive antenna becomes very similar to that of the steering beam when there are a large number of randomly distributed active users in the sector.
Hawryszkiewycz, I 1970, 'An approach to teaching cooperative systems', Proceedings. 1998 International Conference Software Engineering: Education and Practice (Cat. No.98EX220), 1998 International Conference Software Engineering: Education and Practice, IEEE Comput. Soc, pp. 296-303.
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This paper discusses issues concerned with teaching of use of Internet technologies and groupware in information systems. It identifies three strongly related parts in this subject area, namely, technical, social and design processes and describes how they differ from existing transaction based systems. The paper then suggests an approach for teaching about cooperative systems. It then outlines the kinds of topics that should be included in curricula and illustrates with an example of an ongoing course.
Hawryszkiewycz, I & Debenham, J 1970, 'A workflow system based on agents', Database and Expert Systems Applications, 9th International Conference, DEXA '98, Vienna, Austria, August 24-28, 1998, Proceedings, International Conference on Database and Expert Systems Applications, Springer Berlin Heidelberg, Vienna, Austria, pp. 135-144.
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Hawryszkiewycz, IT 1970, 'A Workflow Approach to Designing Cooperative Systems', Proceedings of the 3rd International Conference on the Design of Cooperative Systems (COOP '98), Cannes, France, pp. 165-174.
Hoang, D & Williamson, G 1970, 'A mixture of global and local gated experts for the prediction of high frequency foreign exchange rates', Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Springer Berlin Heidelberg, pp. 329-340.
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© Springer-Verlag Berlin Heidelberg 1998. This paper presents a new mixture of experts neural network architecture for the prediction of the US Dollar Swiss Franc exchange rate. This architecture achieves improved prediction results on noisy and non-stationary data. In contrast to previous efforts the current system was designed with a particular emphasis on solving the problems of local overfitting & underfitting caused by non-stationarity and noise in the data. The cascade correlation constructive neural network training algorithm was used for the fast training of near optimal complexity global & local experts. The Kohonen Self Organizing Map was used to find regions of the data on which to train local experts. Improved results were obtained by using a combination of the outputs of the global & local experts.
Hooli, K & Oppermann, I 1970, 'Effect of signal quantization on the performance of LMMSE receiver in WLL channels', IEEE International Symposium on Spread Spectrum Techniques & Applications, IEEE 5th International Symposium on Spread Spectrum Techniques and Applications, IEEE, SUN CITY, SOUTH AFRICA, pp. 536-540.
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This paper examines the effect of signal quantization on the performance of an adaptive LMMSE DS-CDMA receiver in the uplink of low mobility, high data rate wireless local loop (WLL) application. The baseband receiver considered is the LMS-LMMSE receiver which includes the finite quantization of the incoming signal. Both AWGN channel and multipath channel model based on actual channel measurements are used in the computer simulations. Also the effect of imperfect power control on the signal quantization is considered. It is shown that the degradation in the performance of the receiver is relatively insignificant with practical levels of quantization.
Hubert, CJ, Waldron, KJ & Venkataraman, SC 1970, 'Dynamic and Static Simulators for Wheeled Vehicles', Robotics 98, Third ASCE Specialty Conference on Robotics for Challenging Environments, American Society of Civil Engineers, pp. 216-222.
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Terrain adaptive wheeled vehicles offer great promise for locomotion on rugged terrain. In order to properly design terrain adaptive vehicles or control schemes for such vehicles, one needs an effective simulator. Many simulators are based on detailed dynamic analysis. Featherstone's method of articulated inertias makes such dynamic simulators reasonably efficient. However, rover vehicles often operate at low speeds that make the dynamic analysis unnecessary. A simpler approach is to use only velocity and position information to obtain the next state. Simulation on rugged terrain requires the program to account for gravitational and contact forces. An algorithm using potential energy methods is proposed as an alternate rough terrain simulator. © 1998 American Society of Civil Engineers.
Kim, JG & Krunz, M 1970, 'Effective bandwidth in wireless ATM networks', Proceedings of the 4th annual ACM/IEEE international conference on Mobile computing and networking, MobiCom98: 4th Annual ACM International Conference on Mobile Computing and Networking, ACM.
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Krunz, M & Makowski, A 1970, 'A source model for VBR video traffic based on M/G/∞ input processes', Proceedings. IEEE INFOCOM '98, the Conference on Computer Communications. Seventeenth Annual Joint Conference of the IEEE Computer and Communications Societies. Gateway to the 21st Century (Cat. No.98CH36169), IEEE INFOCOM'98 Conference on Computer Communications Seventeenth Annual Joint Conference of the IEEE Computer and Communications Societies Gateway to the 21st Century, IEEE, SAN FRANCISCO, CA, pp. 1441-1448.
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Latva-aho, M, Juntti, M & Oppermann, I 1970, 'Reconfigurable adaptive RAKE receiver for wideband CDMA systems', VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151), VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to a Global Wireless Revolution, IEEE, OTTAWA, CANADA, pp. 1740-1744.
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Ling Guan, Perry, S, Romagnoli, R, Hausan Wong & Haosong Kong 1970, 'Neural vision system and applications in image processing and analysis', Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181), 1998 IEEE International Conference on Acoustics, Speech, and Signal Processing, IEEE, SEATTLE, WA, pp. 1245-1248.
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Liu, RP, Richards, A & Rogers, G 1970, 'MARSHNet, a superimposed QoS guaranteed virtual path network', Conference Record / IEEE Global Telecommunications Conference, IEEE Global Telecommunications Conference (GLOBECOM 98), IEEE, SYDNEY, AUSTRALIA, pp. 7-12.
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This paper describes the design and configuration of a metropolitan ATM network consisting of two superimposed virtual networks. Virtual paths and virtual switches were created to construct the two Virtual Path Networks (VPNs). Creative ideas and novel techniques were employed for network partitioning, bandwidth sharing and QoS guarantees. These techniques did allow most of the design objectives to be met.
Lu, HY, Zhu, JG, Hui, SYR & Ramsden, VS 1970, 'A generalized dynamic transformer circuit model including all types of core losses', 1998 International Conference on Power Electronic Drives and Energy Systems for Industrial Growth, 1998. Proceedings., 1998 International Conference on Power Electronics Drives and Energy Systems for Industrial Growth, IEEE, pp. 978-983.
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© 1998 IEEE. This paper describes a generalized dynamic transformer circuit model that includes all types of core losses, nonlinear magnetic characteristics, skin effects of eddy currents in the core, and thermal effects on hysteresis of core materials. A TLM-based transform with variable time steps is employed in the simulation. This model can provide an accurate prediction of transformer performance and core losses and is suitable for simulation of high frequency switching mode converters using transformer isolated outputs. Some interesting issues such as stray capacitance, are discussed. Simulations of a 500 W transformer in a full bridge inverter operated at 15 kHz and 25 kHz have been confirmed by experiments.
Lu, HY, Zhu, JG, Hui, SYR, Ramsden, VS, IEEE, IEEE & IEEE 1970, 'Dynamic circuit modeling of a high frequency transformer', PESC 98 RECORD - 29TH ANNUAL IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1 AND 2, 29th Annual IEEE Power Electronics Specialists Conference, IEEE, FUKUOKA, JAPAN, pp. 1479-1485.
Luk, KC, Ball, JE & Sharma, A 1970, 'Rainfall forecasting through artificial neural networks', HYDROINFORMATICS '98, VOLS 1 AND 2, 3rd International Conference on Hydroinformatics, A A BALKEMA PUBLISHERS, COPENHAGEN, DENMARK, pp. 797-804.
Madhavan, R, Dissanayake, MWMG & Durrant-Whyte, HF 1970, 'Autonomous underground navigation of an LHD using a combined ICP-EKF approach', Proceedings. 1998 IEEE International Conference on Robotics and Automation (Cat. No.98CH36146), IEEE International Conference on Robotics and Automation, IEEE, KATHOLIEKE UNIV LEUVEN, LEUVEN, BELGIUM, pp. 3703-3708.
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Moss, D, Canning, J & Bazylenko, M 1970, 'Bragg gratings in hollow-cathode PECVD germanosilica planar waveguides', Technical Digest. Summaries of Papers Presented at the Conference on Lasers and Electro-Optics. Conference Edition. 1998 Technical Digest Series, Vol.6 (IEEE Cat. No.98CH36178), Technical Digest Summaries of papers presented at the Conference on Lasers and Electro-Optics Conference Edition. 1998 Technical Digest Series, Vol.6, IEEE, p. 425.
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Waveguide gratings were fabricated in intrinsically low-loss (0.2 dB/cm with no annealing) germanosilica waveguide layers without the use of any material presensitization. The waveguides were grown by a novel technique called hollow-cathode PECVD.
Nagai, H, Miyanaga, Y & Tochinai, K 1970, 'An edge detection by using self-organization', Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181), 1998 IEEE International Conference on Acoustics, Speech, and Signal Processing, IEEE, SEATTLE, WA, pp. 2749-2752.
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Naishadham, K & Esselle, K 1970, 'A hybrid implementation of the FDTD and moment methods', IEEE Antennas and Propagation Society International Symposium. 1998 Digest. Antennas: Gateways to the Global Network. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.98CH36194), IEEE Antennas and Propagation Society International Symposium. 1998 Digest. Antennas: Gateways to the Global Network. Held in conjunction with: USNC/URSI National Radio Science Meeting, IEEE, ATLANTA, GA, pp. 574-577.
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O'Neill, T & Leaney, J 1970, 'Open complex computer systems are no silver bullet', Proceedings. Fourth IEEE International Conference on Engineering of Complex Computer Systems (Cat. No.98EX193), Fourth IEEE International Conference on Engineering of Complex Computer Systems. ICECCS '98, IEEE Comput. Soc, pp. 79-86.
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© 1998 IEEE. Open systems, through the use of public, consensus based specifications or standards, are focussed on achieving the interoperability between, and the portability of components. In accommodating standards, open systems promise the advantages of plug-n-play technology, rapid prototyping and component re-use, while at the same time preventing system integration misfits, short system lifespan and difficulty in maintenance. In the development of open systems, it has been recognised that the specification and standardisation of interfaces, nor components, is of critical importance to realising these advantages. Due to the critical role of interfaces in open systems, the quality of the interface specifications used to engineer the interfaces is fundamental to the fulfilment of the promises of open systems. The authors contend that since current specifications and standards are deficient, then open complex computer systems, built using these specifications and standards, will indeed be no silver bullet. The authors present several ways forward, based on the inter-relationships between components, so that in the future the promises of open complex computer systems may still be fulfilled.
Oppermann, I 1970, 'Capacity of a DS-CDMA system supporting mixed modulation', IEEE GLOBECOM 1998 (Cat. NO. 98CH36250), IEEE GLOBECOM 1998, IEEE, SYDNEY, AUSTRALIA, pp. 3403-3407.
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Oppermann, I 1970, 'Quantization effects on a family of complex valued spreading sequences', 1988 IEEE 5th International Symposium on Spread Spectrum Techniques and Applications - Proceedings. Spread Technology to Africa (Cat. No.98TH8333), ISSSTA'98 International Symposium on Spread Spectrum Techniques and Applications, IEEE, SUN CITY, SOUTH AFRICA, pp. 696-700.
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Oppermann, I & Latva-Aho, M 1970, 'Capacity of a packetised wideband LMMSE CDMA system with antenna diversity', 1988 IEEE 5th International Symposium on Spread Spectrum Techniques and Applications - Proceedings. Spread Technology to Africa (Cat. No.98TH8333), ISSSTA'98 International Symposium on Spread Spectrum Techniques and Applications, IEEE, SUN CITY, SOUTH AFRICA, pp. 786-791.
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Oppermann, I & Latva-Aho, M 1970, 'Efficient packetised CDMA system for a high mobility urban environment', VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151), VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to a Global Wireless Revolution, IEEE, OTTAWA, CANADA, pp. 2192-2196.
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Parfitt, AJ & Bird, TS 1970, 'Application of a near-field transform algorithm to antenna coupling using the FDTD method', IEEE Antennas and Propagation Society International Symposium. 1998 Digest. Antennas: Gateways to the Global Network. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.98CH36194), IEEE Antennas and Propagation Society International Symposium. 1998 Digest. Antennas: Gateways to the Global Network. Held in conjunction with: USNC/URSI National Radio Science Meeting, IEEE, pp. 500-503.
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© 1998 IEEE. The finite-difference time-domain (FDTD) method is useful in many antenna applications because it facilitates modelling of complex structures and is capable of characterising antenna performance over a wide-frequency band. However, for antenna arrays of even modest size, the excessive computer storage and run-time may become prohibitive for design and optimisation purposes. Some work has been done with time-domain transform methods for computing weak coupling between antennas (Page et al. 1996). In this paper, an algorithm is developed using the Kirchhoff near-field to near-field transformation (Shlager and Smith, 1995) for the one-way coupling between antenna elements. This coupling representation is then applied to arrays in a manner analogous to an element-by-element analysis in the frequency domain, except that in the method described here the coupled currents at the antenna-feed ports are added in the time-domain so as to permit the introduction of true-time delays for wide-band beam steering. The advantages of the transform method over a full FDTD method are smaller computer storage and a reduction in late-time FDTD effects associated with reflections from the absorbing boundary on the outer surface of the computational domain and also from numerical dispersion and instabilities.
Perry, S & Sutton, J 1970, 'Sonar image enhancement in turbid environments', 1998 Joint Conference on Information Sciences, Research Triangle Park, North Carolina, USA.
Perry, SW & Ling Guan 1970, 'A statistics-based weight assignment in a Hopfield neural network for adaptive image restoration', 1998 IEEE International Joint Conference on Neural Networks Proceedings. IEEE World Congress on Computational Intelligence (Cat. No.98CH36227), ICNN '98 - International Conference on Neural Networks, IEEE, ANCHORAGE, AK, pp. 922-927.
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Perry, SW & Ling Guan 1970, 'Perception based adaptive image restoration', Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP '98 (Cat. No.98CH36181), 1998 IEEE International Conference on Acoustics, Speech, and Signal Processing, IEEE, SEATTLE, WA, pp. 2893-2896.
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Roughan, M, Veitch, D & Rumsewicz, M 1970, 'Computing queue-length distributions for power-law queues', Proceedings. IEEE INFOCOM '98, the Conference on Computer Communications. Seventeenth Annual Joint Conference of the IEEE Computer and Communications Societies. Gateway to the 21st Century (Cat. No.98CH36169), IEEE INFOCOM'98 Conference on Computer Communications Seventeenth Annual Joint Conference of the IEEE Computer and Communications Societies Gateway to the 21st Century, IEEE, IEEE, pp. 356-363.
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Roughan, M, Veitch, D, Abry, P, IEEE & IEEE 1970, 'On-line estimation of the parameters of long-range dependence', GLOBECOM 98: IEEE GLOBECOM 1998 - CONFERENCE RECORD, VOLS 1-6, IEEE Global Telecommunications Conference (GLOBECOM 98), IEEE, SYDNEY, AUSTRALIA, pp. 3716-3721.
Shoudong Huang & Siying Zhang 1970, 'Decentralized fault tolerant stabilization for symmetric composite systems', Proceedings of the 1998 American Control Conference. ACC (IEEE Cat. No.98CH36207), Proceedings of the 1998 American Control Conference (ACC), IEEE, PHILADELPHIA, PA, pp. 2477-2480.
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Sirivivatnanon, V & Khatri, RP 1970, 'Selective use of Fly Ash concrete', American Concrete Institute, ACI Special Publication, pp. 37-57.
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Structural grade fly ash (FA) concrete and concrete with high volume of fly ash (HVFA) are well accepted and utilized in the Australian construction industry. These are concretes with fly ash (ASTM C 618 type F) making up between 10 and 50 %by weight of the total cementitious material. This paper is intended to demonstrate the importance of the selection of the appropriate amount of FA content for a range of applications. The durability performance of the FA concretes was compared with portland cement concretes of equivalent 28-day compressive strength, in terms of the resistance to carbonation, chloride penetration and sulfate attack. Some mixture design data for both FA and HVFA concretes and their mechanical properties are given. The likely optimum fly ash percentages for a range of applications are highlighted with respect to their properties and construction demands. It was found that a lower fly ash dosage would be more suitable for above-ground structures where a carbonation-related deterioration mechanism applied. However, for structures in aggressive sulfate ground condition or in marine environments, HVFA concrete was found to be much more suitable. Available field performance data have confirmed laboratory evaluated performance.
Stepanov, DY, Canning, J & Brodzeli, Z 1970, 'High-resolution measurements of fibre Bragg grating transmission spectra', 24th European Conference on Optical Communication. ECOC '98 (IEEE Cat. No.98TH8398), ECOC '98 - 24th European Conference on Optical Communication, Telefonica, MADRID, SPAIN, pp. 407-408.
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Tellambura, C, Parker, MG & Barton, SK 1970, 'Channel estimation using discrete Fourier transform techniques', GLOBECOM 98: IEEE GLOBECOM 1998 - CONFERENCE RECORD, VOLS 1-6, IEEE Global Telecommunications Conference (GLOBECOM 98), IEEE, SYDNEY, AUSTRALIA, pp. 148-152.
Voinov, A, Costanza, R, Wainger, L, Boumans, R, Villa, F, Maxwell, T & Voinov, H 1970, 'Integrated ecological economic modeling of watersheds', PROCEEDINGS OF THE 1998 CONFERENCE ON MISSION EARTH: MODELING AND SIMULATION OF THE EARTH SYSTEM, Conference on Mission Earth - Modelling and Simulation of the Earth System, at the 1998 Western MultiConference, SOC COMPUTER SIMULATION, SAN DIEGO, CA, pp. 35-40.
von Bibra, ML, Canning, J & Roberts, A 1970, 'Mode profile modification of H+ ion beam irradiated waveguides using UV processing', JOURNAL OF NON-CRYSTALLINE SOLIDS, Glass and Optical Materials Division / Bragg Gratings, Photosensitivity and Poling in Glass Fibers and Waveguides - Applications and Fundamentals Meeting, ELSEVIER SCIENCE BV, WILLIAMSBURG, VIRGINIA, pp. 121-125.
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Waldron, KJ 1970, 'Lower-Pair Joint Geometry', Volume 1B: 25th Biennial Mechanisms Conference, ASME 1998 Design Engineering Technical Conferences, American Society of Mechanical Engineers.
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Abstract
This paper contains a geometrically based proof that the six lower pair joint types identified by Reuleaux are the only possible kinematic joints for which contact occurs solely over surfaces. The surface geometries for which line contact can occur and the relationship between the geometry of the contacting surfaces and the connectivity, or number of degrees of freedom of the joint is also discussed.
Wang, YJ & Lin, CT 1970, 'Runge Kutta Neural Network for identification of continuous systems', Proceedings of the IEEE International Conference on Systems, Man and Cybernetics, IEEE International Conference on Systems, Man, and Cybernetics - Intelligent Systems for Humans in a Cyberworld (SMC 98), IEEE, SAN DIEGO, CA, pp. 3277-3282.
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This paper proposes Runge Kutta Neural Networks (RKNNs) for identification of continuous-time nonlinear systems. These networks are constructed according to the Runge Kutta approximation method. The RKNNs can thus precisely model continuous-time systems and do long-term prediction of system state trajectories. Since the RKNNs model continuous-time systems, they can incorporate available continuous relationship (physical laws) of the identified systems into their structures directly. Also, they are insensitive to the size of sampling interval in prediction. We also show theoretically the superior generalization and long-term prediction capability of the RKNNs over the normal neural networks. A class of novel recursive least square (RLS) algorithms, called nonlinear recursive least square (NRLS) learning algorithms, are developed for the RKNNs. Computer simulations demonstrate the proved properties of the RKNNs.
Watterson, PA 1970, 'Phasor analysis of six-step 120° conduction permanent magnet motor drives', 1998 International Conference on Power Electronic Drives and Energy Systems for Industrial Growth, 1998. Proceedings., 1998 International Conference on Power Electronics Drives and Energy Systems for Industrial Growth, IEEE, pp. 558-561.
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© 1998 IEEE. The simplest drive for a permanent magnet motor is a three-phase bridge inverter switched according to the six-step, »120° conduction» algorithm. For the more complicated, higher frequency, switching algorithms which give (approximately) a sinusoidal current, phasor analysis of the per-phase equivalent circuit provides a simple accurate description of the phase current and voltage, at least for a motor with near-sinusoidal back-emf and near-uniform inductance. But for six-step switching, there are no well-known general formulae, even describing the relationship between applied DC voltage and motor no-load speed. This paper presents exact analytic phasor analysis for six-step, 120° conduction switching of permanent magnet motors with sinusoidal back-emf. Formulae are given for the fundamental components of voltage and current and for the inferred torque. These formulae enable the DC voltage and the switching advance angle to be determined to operate the motor at any desired torque, speed and fundamental current advance angle. In particular, it is frequently desired to operate the motor with minimum copper loss for a given torque. The copper loss will be close to minimum if the current fundamental is aligned with the back-emf. Using the formulae presented in the paper and a two-dimensional root-finding algorithm, the required switching angle and commutation angle can be determined and the DC link voltage inferred. The paper thus allows simple phasor analysis theory to be translated into six-step switching prescriptions.
Wu, XB & Esselle, KP 1970, 'Analytical formulation for three-dimensional scattering from an anisotropic-material-coated conducting rod', IEEE Antennas and Propagation Society International Symposium. 1998 Digest. Antennas: Gateways to the Global Network. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.98CH36194), IEEE Antennas and Propagation Society International Symposium. 1998 Digest. Antennas: Gateways to the Global Network. Held in conjunction with: USNC/URSI National Radio Science Meeting, IEEE, ATLANTA, GA, pp. 2160-2163.
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Zhang, DM & Alem, L 1970, 'A generic case-based framework for assisting instructional design', ADVANCES IN CASE-BASED REASONING, 4th European Workshop on Case-Based Reasoning (EWCBR 98), SPRINGER-VERLAG BERLIN, TRINITY COLL, DUBLIN, IRELAND, pp. 322-333.
Zhong, M, Zhu, J, Ramsden, VS & Guo, Y 1970, 'Magnetic Properties of Composite Soft Magnetic Materials with 2-D Fluxes', Proceedings of Australasian Universities Power Engineering Conference, University of Tasmania, Australia, Hobart, Australia, pp. 377-382.
Zhu, JG, Lu, HY, Ramsden, VS & Tran, K 1970, 'Temperature dependence of magnetic hysteresis of soft ferrites', NON-LINEAR ELECTROMAGNETIC SYSTEMS, 8th International Symposium on Non-Linear Electromagnetic Systems (ISEM Braunschweig), I O S PRESS, BRAUNSCHWEIG, GERMANY, pp. 495-498.
Zowghi, D & Nurmuliani, N 1970, 'Investigating Requirements Volatility During Software Development: Research in Progress', Proceedings of the Third Australian Conference on Requirements Engineering, Australian Workshop on Requirements Engineering, Victoria.
