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Link-state aware traffic scheduling for providing predictive QoS in wireless mobile multimedia networks

6th international conference on High Performance Computing, HiPC 1999

作者： Hossain, A.Z.M. Ekram Bhargava, Vijay K. Department of Electrical and Computer Engineering University of Victoria PO Box 3055 STN CSC Victoria BC V8W 3P6 Canada

ISBN: (纸本)3540441271

Performance of a centralized traffic priority based dynamic burst level cell scheduling scheme is investigated in a correlated fading channel. the scheduling scheme is designed for transmission of multi-service traffic over TDMA/TDD channels in a WATM (Wireless ATM) network. In this scheme, the number of slots allocated to a VC (Virtual Circuit) is changed dynamically depending on the traffic type, system traffic load, the TOE (Time of Expiry) value of the data burst and data burst length in addition to the channel error status. In fact, the scheme can be considered as a single integrated scheme for link-level traffic scheduling and ARQ-based error control for multi-service wireless networks. Performance of the proposed scheme is evaluated through computer simulation for realistic voice, video and data traffic models, the QoS requirements of different traffic classes in a wireless mobile network and correlated Rayleigh fading channel model. Simulation results show that, the proposed scheduling scheme can provide reasonably high channel utilization with predictive QoS guarantee in a multi-service traffic environment. At the same time such a scheme can result in an energy efficient TDMA/TDD medium access control protocol for broadband wireless access. © 1999 Springer-Verlag Berlin Heidelberg.

关键词： Quality of service

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A generalised neural-fuzzy well log interpretation model with a reduced rule base

A generalised neural-fuzzy well log interpretation model wit...

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international conference on Neural Information Processing

作者： Kok Wai Wong Chun Che Fung D. Myers Information Technology South East Metropolitan College Thornlie Australia School of Electrical and Computer Engineering Curtin University of Technology Bentley Australia

A generalised neural-fuzzy interpretation model combining the advantages of neural networks and fuzzy logic as an interpretation tool for well-log data analysis is reported in this paper. the model makes use of an artificial neural network to learn the underlying function from a set of training data and then it is used to generate a fuzzy rules-based model. the fuzzy rules-based model enables a log analyst to gain a better understanding of the model. Furthermore, the rule set may be manipulated to modify the performance of the model by incorporating the experience or knowledge of the analyst. However, the number of fuzzy rules generated can be very large. A method is proposed to substantially reduce this number to suit the conditions of the well under investigation. this allows easier interaction between the operator and the model while maintaining prediction accuracy.

关键词： Artificial neural networks predictive models Fuzzy logic Australia Electronic mail Training data Permeability Information technology Educational institutions Data analysis

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Effect of altering the Gaussian function receptive field width in RBF neural networks on aluminium fluoride prediction in industrial reduction cells

Effect of altering the Gaussian function receptive field wid...

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international conference on Neural Information Processing

作者： V. Karri F. Frost School of Science and Engineering University of Tasmania Hobart TAS Australia DCC Office Comalco Aluminium Limited Bell Bay TAS Australia

Artificial neural networks are increasingly useful computational models, consisting of highly interconnected parallel processing units. In particular, radial basis function, RBF, networks are emerging as important computational models for a broad range of applications. the Gaussian function used in RBF networks has an adjustable parameter, /spl sigma/, which specifies the diameter of the receptive field of the hidden layer neurons. the selection of /spl sigma/ is commonly carried out using heuristic techniques. the selection of /spl sigma/, as shown in this paper, plays an important role in the predictive capabilities of the RBF network. However, the use of a Gaussian function with the standard deviation of the training pattern output vector is shown to be associated with the minimum RMS error obtained using an optimum /spl sigma/ value derived using a heuristic technique. the aluminium fluoride, AlF/sub 3/, content of industrial reduction cell for aluminium production is well predicted using the RBF network with a Gaussian function /spl sigma/ value derived using the standard deviation of the training pattern output vector.

关键词： Radial basis function networks Industrial training Computer networks Computational modeling Aluminum Artificial neural networks Concurrent computing Parallel processing Neurons Metal product industries

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Optimization and integration of forward observer decision making model

Optimization and integration of forward observer decision ma...

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international conference on Knowledge-Based Intelligent Information engineering Systems (KES)

作者： V. Ivancevic L.C. Jain V. Puri D. Filippidis Knowledge Based Intelligent Engineering Systems Centre University of South Australia Mawson Lakes SA Australia Weapons Systems Division DSTO Australia Salisbury SA Australia

A previously formulated [A. Bouzerdoum, D. Filippidis, and V. Purl, 1998) forward-observer (FO) decision-making (DM) model is generalized using global mathematical analysis, optimized (physically and physiologically) and integrated using a computer algebra system (CAS) for application into live training and combat operation (CO). the global geometro-dynamical FO analysis includes: designing the phase-space manifold of the FO's action, the FO's DM system, CO dynamics as visualized by the FO, an integrated FO's DM-CO project, and the problem of chaos in the global DM-CO project. the FO's CAS contains active Mathematica notebooks for the evaluation and simulation of equations formulated in the global mathematical analysis. this includes three original packages: DM-CAS (applied for prediction of the fraction of casualties), CO simulation, and integrated DM-CO simulation.

关键词： Decision making Delta modulation Mathematical analysis Content addressable storage predictive models Mathematical model Physics computing Algebra Application software Visualization

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Discrete spatial simulations in structural mechanics and in environmental problems

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ADVANCES IN engineering software 1998年第7-9期29卷 723-731页

作者： Walukiewicz, H Bielewicz, E Gorski, J Gdansk Tech Univ Dept Struct Mech PL-80952 Gdansk Poland

Digital simulations of random variables or random fields in conjunction with probabilistic methods can be regarded as powerful tools in the analysis of the reliability of nonlinear models of structures and in modelling of environmental problems. In this paper three civil engineering problems are presented and solved using the same methodology of random sampling. the first problem concerns the stability of nonlinear randomly imperfect structures with special attention paid to the probability distribution of the limit loads. the second problem is devoted to the analysis of the effect of the material and load imperfections on the response of nonlinear shell structures. the third problem deals with the theoretical reconstruction of physical processes in soil, water or air on the basis of limited, fragmentary observed data. this paper presents a unified approach to solutions of nonlinear equations arising in time-independent discrete models with random parameters. (C) 1998 Elsevier Science Limited and Civil-Comp Limited. All rights reserved.

关键词： software engineering

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Some consistent finite element formulations of 1-D beam models: a comparative study

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ADVANCES IN engineering software 1998年第7-9期29卷 667-678页

作者： Ortuzar, JM Samartin, A Univ Politecn Madrid Escuela TS Ingn Caminos Canales & Puertos Dept Struct Mech E-28040 Madrid Spain

A consistent Finite Element formulation was developed For four classical 1-D beam models. this formulation is based upon the solution of the homogeneous differential equation (or equations) associated with each model. Results such as the shape functions, stiffness matrices and consistent force vectors for the constant section beam were found. Some of these results were compared with the corresponding ones obtained by the standard Finite Element Method (i.e. using polynomial expansions for the field variables). Some of the difficulties reported in the literature concerning some of these models may be avoided by this technique and some numerical sensitivity analysis on this subject are presented. (C) 1998 Elsevier Science Ltd and Civil-Comp Ltd. All rights reserved.

关键词： finite element formulation differential equations polynomial functions

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the development of a simulink toolbox for advanced electrical drives simulation 6

The development of a simulink toolbox for advanced electrica...

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6th international conference on Optimization of Electrical and Electronic Equipments, OPTIM 1998

作者： Teodorescu, Remus Iov, Florin Lungeanu, Florin Tataru, Ana Maria Dumitriu, Teodor Panaitescu, Razvan Dunarea de Jos University of Galati Electrical Engineering Department Domneasca Street No. 111 Galati Romania Transilvania University of Brasov Romania

ISBN: (纸本)9739851126

this paper demonstrates the practicality of Simulink dynamic block-oriented simulation software. A Simulink toolbox comprising the most widely used blocks in electrical drives, i.e. electrical machines, mechanical loads, power electronics and controllers was elaborated by the authors. In order to validate the models, the simulation results was compared against the experimental results. Its purpose is to collect a number of verified mathematical models and make them available for the students and researchers as a tool in the process of control stategies design for controlled electrical drives. © 1998 Institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： Power electronics

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Ultrasonic ranging system - A simulation study 6

Ultrasonic ranging system - A simulation study

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6th international conference on Optimization of Electrical and Electronic Equipments, OPTIM 1998

作者： Morar, S.-I. Aggoun, A. Morar, M.-D. De Montfort University Faculty of Computing Science and Engineering Gateway LeicesterLE1 9BH United Kingdom

ISBN: (纸本)9739851126

the objective of this paper is to build and develop a software package for simulating an ultrasonic ranging system, in such a way that the data can be integrated in an optical scanning system. In achieving the objective the following aspects are investigated. First, the ultrasonic transducer is modelled. A new model for an ultrasonic transducer is developed. the transducer is decomposed based on its filtering and damping properties. models for propagation medium and different targets are integrated into the simulation system. the Ranging System is simulated, using the proposed models. the simulated results are discussed by comparison with experimental measurements. © 1998 Institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： Ultrasonic transducers

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Developing the designer's toolkit with software comprehension models 13

Developing the designer's toolkit with software comprehensio...

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13th IEEE international conference on Automated software engineering

作者： Walenstein, A Simon Fraser Univ Sch Comp Sci Burnaby BC V5A 1S6 Canada

ISBN: (纸本)0818687509

Cognitive models of square comprehension are potential sources of theoretical knowledge for tool designers. Although their use in analysis of existing tools is fairly well-established the literature has shown only limited use of such models for directly developing design ideas. this paper suggests a way of utilizing existing cognitive models of software comprehension to generate design goals and suggest design strategies early in the development cycle. A crucial part of our method is a scheme for explaining the value of tool features by describing the mechanisms that are presumed to underly the expected improvements in task performance.

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Compression of Strings with Approximate Repeats 6

Compression of Strings with Approximate Repeats

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6th international conference on Intelligent Systems for Molecular Biology, ISMB 1998

作者： Allison, L. Edgoose, T. Dix, T.I. School of Computer Science and Software Engineering Monash University 3168 Australia

ISBN: (纸本)1577350537

We describe a model for strings of chariicters that is loosely bcised on the Lempel Ziv model with the addition that a repeated substring can be an approximate match to the original substring;this is close to the situation of DNA, for example. Typically there are many explanations for a given string under the model, some optimal and many suboptimal. Rather than commit to one optimal explanation, we sum the probabilities over all explanations under the model because this gives the probability of the data under the model. the model has a small number of parameters and these can be estimated from the given string by an expectation-maximization (EM) algorithm. Each iteration of the EM algorithm takes O(n2) time and a few iterations are typically sufficient. O(n2) complexity is impractical for strings of more than a few tens of thousands of characters and a faster approximation algorithm is also given. the model is further extended to include approximate reverse complementary repeats when aiicdyzing DNA strings. Tests include the recovery of parameter estimates from known sources and applications to real DNA strings. © 1998, AAAI (***). All rights reserved.

关键词： Hidden Markov models

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