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Asia International Conference on Modeling & Simulation

作者： Kashinath Basu Frank Ball Department of Computing Oxford Brookes University Wheatley UK School of Design Engineering and Computing Bournemouth University Poole Dorset UK

This paper presents the development and evaluation of a model for mapping the quality of service (QoS) requirements and traffic characteristics of aggregated IP traffic flows belonging to multiple classes of continuous media (audio and video) sources onto a single ATM virtual channel (VC) that is also shared with a number of IP data classes. This model was developed as part of a wider range of research activity focused on supporting QoS in future IP networks. The model presented in this paper offers improvements on an earlier model that used an "idealized" scheduler and was validated only for homogeneous continuous media sources. The paper discusses the improved scheduling mechanism that can minimize the effects of imperfections in cell level scheduling and presents a simulation experiment to validate the new model for aggregated heterogeneous continuous media sources

关键词： Quality of service Traffic control Processor scheduling Virtual colonoscopy Nonhomogeneous media Bandwidth Delay Telecommunication traffic IP networks Resource management

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Neural Networks Applied for Cork Tiles Image Classification

Neural Networks Applied for Cork Tiles Image Classification

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IEEE Symposium on Computational Intelligence in Image and Signal Processing, CIISP

作者： A. Georgieva I. Jordanov T. Rafik School of Computing University of Portsmouth Portsmouth UK School of Product and Engineering Design University of Wales Institute of Science and Technology Cardiff UK

In this paper a hybrid global optimization method GLPTS is further investigated and applied for feed-forward neural networks supervised learning. The method is initially tested on several benchmark problems and subsequently employed for pattern recognition problem. The proposed technique is used for training neural networks (NN) that have to inspect and classify three types of cork tiles images. During the feature extraction phase, statistical textural characteristics are obtained from the tiles' images and then used for training several different NN architectures. Results from the testing phase are discussed and analysed, showing good generalization abilities of the trained NN. Finally, directions of future work are briefly stated

关键词： Neural networks Tiles Image classification Optimization methods Feedforward systems Feedforward neural networks Supervised learning Benchmark testing Pattern recognition Feature extraction

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Distributed Video Coding With MIMO for Video Wireless Communications

Distributed Video Coding With MIMO for Video Wireless Commun...

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IEEE International Conference on Signal Processing and Communications, ICSPC

作者： W.A.R.J. Weerakkody W.A.C. Fernando K. Muraleetharan S. Adedoyin Centre for Communications Systems Research University of Surrey Guildford UK Electronics and Computing Engineering School of Engineering and Design Brunei University Uxbridge UK

The research on distributed video coding (DVC) has been increasingly popular in recent times due to its promising features. In video communications over wireless channels, the noise and multipath fading effects have a significant effect on the perceptual video quality. However, it is noted that in all the research literature on DVC, an error free ideal communication channel is assumed. In this paper, we take into account the effects of noise and fading in a wireless channel on the performance of a DVC codec with necessary modifications to the decoding algorithm while proposing a multiple-in-multiple-out (MIMO) based diversity scheme. Simulation results show that the proposed DVC system with 2×2 MIMO channel outperformed the state of the art H.264/AVC video codec at channel SNR levels below 16 dB under similar conditions. Further, possible enhancements to the MIMO configuration are also discussed in this paper.

关键词： Video coding MIMO Wireless communication Decoding Fading Costs design engineering Codecs Signal processing algorithms ISO standards

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An Architectural Approach for Integrating Performance Evaluation into the Systems design Process

An Architectural Approach for Integrating Performance Evalua...

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Asia International Conference on Modeling & Simulation

作者： Frank Ball Irfan Awan Rubem Pereira School of Design Engineering and Computing Bournemouth University Poole Dorset UK Network and Performance Engineering Research Group University of Bradford Bradford UK School of Computing and Mathematical Sciences Liverpool John Moores University Liverpool UK

This paper presents work aimed at integrating performance evaluation into the systems design process. It considers the problem of providing a performance evaluation service to system designers that will allow practitioners from different application areas to specify the system in a level of abstraction that is readily understandable in their own particular application area, and then to use this specification to automatically generate a solution for the performance evaluation of that system. It presents the proposal for an open-systems-like architectural approach to the problem of providing these services and outlines the research issues that need to be addressed in the development of this architecture

关键词： Object oriented modeling design engineering Computer networks Proposals Real time systems Application software Process design Programming Software performance Computational modeling

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A review of particle swarm optimization. Part II: hybridisation, combinatorial, multicriteria and constrained optimization, and indicative applications

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Natural computing 2007年第1期7卷 109-124页

作者： Alec Banks Jonathan Vincent Chukwudi Anyakoha Tornado In-Service Software Maintenance Team Royal Air Force Wiltshire UK Software Systems Modelling Group School of Design Engineering and Computing Bournemouth University Poole UK

Particle Swarm Optimization (PSO), in its present form, has been in existence for roughly a decade, with formative research in related domains (such as social modelling, computer graphics, simulation and animation of natural swarms or flocks) for some years before that; a relatively short time compared with some of the other natural computing paradigms such as artificial neural networks and evolutionary computation. However, in that short period, PSO has gained widespread appeal amongst researchers and has been shown to offer good performance in a variety of application domains, with potential for hybridisation and specialisation, and demonstration of some interesting emergent behaviour. This paper aims to offer a compendious and timely review of the field and the challenges and opportunities offered by this welcome addition to the optimization toolbox. Part I discusses the location of PSO within the broader domain of natural computing, considers the development of the algorithm, and refinements introduced to prevent swarm stagnation and tackle dynamic environments. Part II considers current research in hybridisation, combinatorial problems, multicriteria and constrained optimization, and a range of indicative application areas.

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Restoration of noisy and band limited archived speech records with linear predictor and harmonic noise models

Restoration of noisy and band limited archived speech record...

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European Signal Processing Conference (EUSIPCO)

作者： Qin Yan Saeed Vaseghi Esfandiar Zavarehei Ben Milner School of Engineering and Design Brunel University London School of Computer and Information Engineering Hohai University Nanjing P. R. China School of Computing Sciences University of East Anglia Norwich UK

A method is presented for restoration of noisy bandlimited archived speech records. Speech is modeled with a formant-tracking linear prediction (FTLP) model of the spectral envelope and a harmonic noise model (HNM) of the excitation. The time-varying trajectories of the parameters of the LP and HNM models are tracked with Viterbi classifiers and denoised with Kalman filters. A frequency domain pitch estimation is proposed, which searches for the peak SNRs at the harmonics. The LP-HNM model is used to deconstruct noisy speech, de-noise its LP and HNM models and then reconstitute the cleaned speech. The missing spectrum at lower and higher frequency bands are reconstructed through spectral extrapolation of the LP-HNM model. Comparative evaluations show the performance gains obtained from the proposed method.

关键词： Speech Harmonic analysis Power harmonic filters Noise Noise measurement Kalman filters Estimation

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An investigation of the potential for enhancing the computational turbomachinery design cycle using surrogate models and high performance parallelisation

An investigation of the potential for enhancing the computat...

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2007 ASME Turbo Expo

作者： Kipouros, Timoleon Parks, Geoffrey T. Molinari, Massimillano Savill, Mark Dawes, William N. Jenkins, Karl W. Engineering Design Centre Department of Engineering University of Cambridge Cambridge CB2 1PZ United Kingdom Computational Aerodynamics and Design Group Department of Aerospace Sciences Cranfield University Cranfield MK43 OAL United Kingdom Computational Fluid Dynamics Laboratory Department of Engineering University of Cambridge Cambridge CB2 1PZ United Kingdom Applied Mathematics and Computing School of Engineering Cranfield University Cranfield MK43 0AL United Kingdom

ISBN: (纸本)079184790X

This paper describes the deployment of supplementary tools to the modern industrial aerodynamic design cycle in the context of multi-objective optimisation. The benefits arising through the use of these tools are demonstrated through a single-row stator compressor test case, minimising two of the flow characteristics most critical to the efficiency of the turbomachine: blockage and entropy generation rate. The automatic integrated design system used, MOBOS3D, is equipped with an application-specific optimiser and a RBF surrogate model, in order to decrease the computational cost of the design evaluation process. The metamodel is utilised inside the system and is constantly trained in real time from the current database of the simulated test cases. In addition, a new parallelisation strategy is implemented, which exploits the possibility of executing simulations on a cluster of clusters, reducing significantly the wall-clock time required for the design optimisation process of real-world applications. Copyright © 2007 by ASME.

关键词： Turbomachinery

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Dynamic Pooling for the Combination of Forecasts generated using Multi Level Learning

Dynamic Pooling for the Combination of Forecasts generated u...

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International Joint Conference on Neural Networks (IJCNN)

作者： Silvia Riedel Bogdan Gabrys Lufthansa Systems Berlin GmbH Berlin Germany Computational Intelligence Research Group School of Design Engineering & Computing Bournemouth University Poole UK

In this paper we provide experimental results and extensions to our previous theoretical findings concerning the combination of forecasts that have been diversified by three different methods: with parameters learned at different data aggregation levels, by thick modeling and by the use of different forecasting methods. An approach of error variance based pooling as proposed by Aiolfi and Timmermann has been compared with flat combinations as well as an alternative pooling approach in which we consider information about the used diversification. An advantage of our approach is that it leads to the generation of novel multi step multi level forecast generation structures that carry out the combination in different steps of pooling corresponding to the different types of diversification. We describe different evolutionary approaches in order to evolve the order of pooling of the diversification dimensions. Extensions of such evolutions allow the generation of more flexible multi level multi step combination structures containing better adaptive capabilities. We could prove a significant error reduction comparing results of our generated combination structures with results generated with the algorithm of Aiolfi and Timmermann as well as with flat combination for the application of Revenue Management seasonal forecasting.

关键词： Covariance matrix Predictive models Neural networks Estimation error Analysis of variance Risk analysis Computational intelligence design engineering Knowledge engineering Costs

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Digital phoenix project: A multidimensional journey through time

Digital phoenix project: A multidimensional journey through ...

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10th International Conference on Computers in Urban Planning and Urban Management, CUPUM 2007

作者： Guhathakurta, S. Kobayashi, Y. Patel, M. Holston, J. Lant, T. Crittenden, J. Li, K. Konjevod, G. Date, K. School of Planning College of Design Arizona State University Tempe AZ 85287-2005 United States School of Architecture + Landscape Architecture College of Design Arizona State University Tempe AZ 85287-1605 United States Department of Visual Communication Design College of Design Arizona State University Tempe AZ 85287-2105 United States Herberger Center College of Design Arizona State University Tempe AZ 85287-1905 United States Decision Theatre Arizona State University Tempe AZ 85287-8409 United States Department of Civil and Environmental Engineering Arizona State University Tempe AZ 85287-5306 United States School of Computing and Informatics Arizona State University Tempe AZ 85287-8809 United States

ISBN: (纸本)9788585205775

The Digital Phoenix project is a multiyear project aimed at developing a realistic digital representation of the Phoenix metropolitan area through space and time that can be experienced in Arizona State University's Decision Theater. A significant objective of this project is to create an environment for querying, researching, and visualizing critical issues confronting a rapidly urbanizing area about urban sustainability. By creating a multidimensional virtual model of Phoenix from a variety of data sources, we can visualize patterns of growth and development, as well as their consequences emerging across the continuums of space and time. The modeling of future environments will enable the assessment of policy scenarios and guide desired future urban-environmental patterns. A digitally constructed model of the city will also allow us to discover what Phoenix could have been like, starting with historical data as the basis for projecting to the present and into the future.

关键词： Sustainable development

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GRIDCC: A real-time grid workflow system with QoS

GRIDCC: A real-time grid workflow system with QoS

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作者： McGough, A. Stephen Akram, Asif Guo, Li Krznaric, Marko Dickens, Luke Colling, David Martyniak, Janusz Powell, Roger Kyberd, Paul Huang, Chenxi Kotsokalis, Constantinos Tsanakas, Panayiotis London E-Science Centre Imperial College London London United Kingdom High Energy Physics Group Imperial College London London United Kingdom Brunel University School of Engineering and Design Uxbridge United Kingdom Computing Systems Laboratory National Technical University of Athens Athens Greece

The over-arching aim of Grid computing is to move computational resources from individual institutions where they can only be used for in-house work, to a more open vision of vast online ubiquitous 'virtual computational' resources which support individuals and collaborative projects. A major step towards realizing this vision is the provision of instrumentation - such as telescopes, accelerators or electrical power stations - as Grid resources, and the tools to manage these resources online. The GRIDCC project attempts to satisfy these requirements by providing the following four co-dependent components;a flexible wrapper for publishing instruments as Grid resources;workflow support for the orchestration of multiple Grid resources in a timely manner;the machinery to make reservation agreements on Grid resources;and the facility to satisfy quality of service (QoS) requirements on elements within workflows. In this paper we detail the set of services developed as part of the GRIDCC project to provide the last three of these components. We provide a detailed architecture for these services along with experimental results from load testing experiments. These services are currently deployed as a test-bed at a number of institutions across Europe, and are poised to provide a 'virtual lab' to production level applications. © 2007 - IOS Press and the authors. All rights reserved.

关键词： Grid computing

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