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D-step-ahead nonlinear predictors using neural networks

IFAC Proceedings Volumes 1999年第2期32卷 8584-8589页

作者： Yonghong Tan Achiel R. Van Cauwenberghe School of Computer Sciences Guilin Institute of Electronic Technology 541004 Guilin P.R. China Dept. of Control Engineering and Automation University of Ghent Technologiepark 9 B-9052 Ghent Belgium

In this paper, three neural network based d-step-ahead prediction strategies, i.e. a recursive d-step-ahead neural predictor, a non-recursive d-step-ahead neural predictor, and a Smith type neural predictor are presented for time-delay compensation for nonlinear systems. Both the recursive and the non-recursive predictors have been extended to the case of long-range prediction. Finally, the proposed neural network based predictors are applied to the prediction of the manifold pressure process in an automotive engine. The predictive result of the corresponding first principles model based nonlinear predictor is also illustrated for comparison. The experimental results show that the neural network based predictive methods have obtained better performance.

关键词： Neural networks prediction nonlinearity time delay modelling

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Hybrid specification and implementation of an aircraft engine controller

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IFAC Proceedings Volumes 1999年第2期32卷 8734-8739页

作者： Julian M. Bass Mohamed S. Hajji Peter J. Fleming School of Electronic Engineering and Computer Systems University of Wales Bangor Dean Street Bangor Gwynedd UK Tel: + 44 (0)1248 382793 Fax: + 44 (0)1248 361429 Dept. of Automatic Control and Systems Engineering University of Sheffield UK

control of a gas-turbine engine requires management of continuous and discrete (state-event) behaviour. A design environment- the Development Framework, is used to define both the continuous and discrete aspects of a turbine engine controller. The approach uses purpose-built software translation tools to capture the system's specification from commercial simulation tools. A unified design model based on a data flow notation, comprising both continuous and state-event behaviour is automatically generated. Specification and design models of selected gas-turbine engine controller subsystems are presented. The complexity of the application suggests that the approach can be used for industrial scale projects.

关键词： continuous systems discrete-event systems design systems software specification software engineering

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Robust control of the longitudinal and lateral dynamics of the BELL 205 helicopter

Robust control of the longitudinal and lateral dynamics of t...

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American control Conference (ACC)

作者： D.J. Walker M.C. Turner A.J. Smerlas M.E. Strange A.W. Gubbeis Dept. of Eng. Leicester Univ. UK Control Systems Research Group Department of Engineering University of Leicester Leicester UK Flight Management and Control Department Defence Evaluation and Research Agency Bedford UK

We describe the design and testing of longitudinal and lateral controllers for the Bell 205 helicopter. The controllers were designed using H/sub /spl infin// optimization in conjunction with low-order linearization taken from a nonlinear flight mechanic model. During flight-tests, decoupled responses were obtained, and desired handling qualities achieved. Tuning the design parameters to bring about desired changes in performance was straight-forward. The bandwidths achieved in flight were close to those predicted by linear analysis.

关键词： Robust control Helicopters Aerospace control Aerodynamics Predictive models Military aircraft Aerospace engineering Aerospace testing Councils Design optimization

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State fence diagrams - a graphical representation for designing reactive systems

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Systems and computers in Japan 1999年第6期30卷 13-22页

作者： Kobayashi, Hiromi Ichinose, Satoru Shidama, Yasunari Department of Management Engineering Tokai University Hiratsuka 259-1292 Japan Dept. of Information Engineering Shinshu University Nagano 380-0922 Japan National Defense Academy Shinshu University Nagano Japan Department of Management Engineering Tokai University Hiratsuka Japan IEEE Computer Society IPS Japan IEICE Shinshu University Hosei University Tokyo Japan Keio University Tokyo Japan Dept. of Information Engineering Shinshu University Nagano Japan SICE

This paper first provides definitions of state fence diagrams (SFD). SFDs are proposed for use in systems analysis and design of reactive systems, such as sequence control systems. The SFDs introduced in this paper include ordered SFD (OSFD), traced SFD (TSFD), normalized SFD (NSFD), and event-ordered SFD (ESFD). A TSFD represents a state space and a time series. An ESFD easily represents event concurrency. We show that these diagrams can be obtained from an event trace diagram (ETD). This paper also presents master/slave relationships among events in an SFD. Interlock, mutual exclusion, and spurious event problems are discussed by using SFD. These are essential factors for safety design. Furthermore, using SFD, safety design for models of a sequence control system and a railroad crossing are shown.

关键词： computer systems

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An integrated framework for development of real-time distributed control software based on can-bus

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IFAC Proceedings Volumes 1999年第2期32卷 8710-8715页

作者： Marga M. Marcos Julian M. Bass Javier Portillo P.J. Fleming Dept Ingenierie'a de Sistemas y Automática Univ. of the Basque Country Spain Tel -34 94 4 2 7 80 55 Fax 34 94 441 40 41 School of Electronic Engineering and Computer Science Univ. of Wales Bangor UK Dept. of Automatic Control and Systems Eng. Univ. of Sheffield UK Associate Professor in Control Engineering

Embedded systems are computer-based systems which must respond to external stimuli within time scales determined by the external environment. Such systems are required to achieve ever more demanding behavioural. performance and safety requirements. Embedded systems are found in applications such as primary flight control, gas-turbine engine control and railway traffic management Often complex embedded systems are distributed, typically to achieve demanding performance or dependability requirements, and must operate within hard real-time constraints. Considerable effort is required to select optimal design solutions and ensure adherence to specified requirements. In embedded systems safety, reliability and response-times are considered as strict constraints on the system design. Achievement of these constraints requires meticulous analysis, typically through the use of specialist modelling and simulation techniques. Integration of knowledge and understanding obtained from disparate detailed models remains a considerable challenge. Ideally, a system which has both continuous dynamics and event-driven parts. would be modelled in one environment, using the most appropriate techniques for each part, and allowing the analysis of the whole system to be carried out simultaneously. The paper presents an integrated approach in order to translate automatically the information manipulated during the different phases of the design: specification. analysis, design and implementation.

关键词： Distributed computer control systems state charts real time systems software tools fieldbus

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Cross-positive vector fields: directed stability

Cross-positive vector fields: directed stability

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IEEE Conference on Decision and control

作者： D.G. Meyer T.L. Piatt A.P. Engelmann J. Hauser Dept. of Electr. & Comput. Eng. Colorado Univ. Boulder CO USA Nonlinear and Real-Time Control Laboratory Electrical & Computer Engineering Department University of Colorado Boulder CO USA University of Colorado Boulder Boulder CO US

Builds on the previous work by the authors (1998) by defining local versions of cross-positivity for vector fields, especially as related to shifted cones. The paper also furthers the development of a stability theory by introducing preliminary concepts of directed stability. The motivation is to apply this theory to analyzing the control of certain directionally constrained models, such as those found in materials processing.

关键词： Materials processing

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Abstracts of presentations on selected topics at the XIVTH International Plant Protection Congress (IPPC) - July 25-30, 1999 - International Convention Center, Jerusalem, Israel

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PHYTOPARASITICA 1999年第4期27卷 299-332页

作者： [Anonymous] Norwich UK State Institute for Quality Control of Agricultural Products (RIKILT-DLO) AE Wageningen The Netherlands Dept. of Entomology and Nematology University of Florida Gainesville USA Ecology and Biocontrol Group National Environment Research Council-(NERC) Inst. of Virology and Environmental Microbiology Oxford UK Consejo Superior de Investigaciones Cientificas — Centro de Ciencas Medioamhiental.es Madrid Spain Friedrich Miescher Institute Basel Switzerland Dept. of Field Crops Faculty of Agricultural Food and Environmental Quality The Hebrew University of Jerusalem Rehovot Israel Leeds Institute for Plant Biotechnology and Agriculture The University of Leeds Leeds UK Plant Genetic Systems Gent Belgium Jealott’s Hill Research Centre Zeneca Agrochemicals Bracknell UK Plant Quarantine Policy Branch Australian Quarantine and Inspection Service (AQIS) Canberra Australia International Plant Genetic Resources Institute (IPGRI) International Network for the Improvement of Banana and Plantain (INIBAP) Parc Scientifique Agropolis II France Dept. of Virology ARO The Volcani Center Bet Dagan Israel Beratungsgruppe Entwicklungsorientierte Agrarforschung (BEAF) Bonn Germany Dept. of Crop Protection Extension Service Ministry of Agriculture and Rural Development Tel Aviv Israel National Food Safety & Toxicology Center Michigan State University East Lansing Center for Minor Crop Pest Management Rutgers University New Brunswick USA ARS/USDA Beltsville USA Dept. of Entomology and Interdepartmental Graduate Program in Genetics University of California Riverside USA Dept. of Virology Wageningen Agricultural University ES Wageningen The Netherlands Dept. of Entomology ARO The Volcani Center Bet Dagan Israel Dept. of Theoretical Production Ecology Wageningen Agricultural University ES Wageningen The Netherlands Dept. of Entomology University of California Davis USA Dept. of Plant Sciences Tel-Aviv University Tel Aviv Israel Inst. of Plant Biochemistry Consejo

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Healthcare Informatics Society of Ireland

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Irish Journal of Medical Science 1999年第4期168卷 276-282页

作者： Rigby, M. Sheridan, A. Draper, R. Stephens, G. Gaffney, P. Grimson, J. Avalos, G. Comerford, F. R. Kanagaratnam, B. Dineen, B. Hamilton, I. Jung, B. Felton, E. Berry, D. Grimson, W. Rice, D. H. Healy, M. Bruce, A. Kelly, J. Carroll, T. Grogan, A. Hurl, G. A. Hyland, D. Roberts, J. Brazil, J. Callanan, I. Devitt, A. O’Brien, T. O’Sullivan, U. M. Peyton, K. Wilson, M. J. Collins, R. Crawley, L. Foley, D. Strachan, H. McBrearty, P. Murnane, R. Murphy, E. Keane, V. Mulvany, F. Sweeney, P. D. Kenny, D. O’Connell, P. R. Balfe, P. Minogue, G. Centre for Health Planning & Management Keele University Keele Staffordshire Britain St. John of God Hospital Stillorgan Hospitaller Order of St. John of God Stillorgan Dept. of Computer Science Trinity College Dublin Clinical Chemistry Laboratory Tallaght Hospital Tallaght Dublin 24 Department of Experimental Medicine Faculty of Medicine National University of Ireland Galway Department of Health Promotion Faculty of Medicine National University of Ireland Galway School of Control Systems & Electrical Engineering Dublin Institute of Technology Ireland Shared Medical Systems Malvern USA Healy Services Dublin Universal Learning Systems Ltd. Dublin The Rotunda Hospital Dublin Mater Misericordiae Hospital Dublin Institute for Healthcare Informatics Dublin First Consulting Group Macclesfield Britain Virus Reference Laboratory UCD Belfield Dublin 4 Cappagh Orthopaedic Hospital Dublin Ireland Southern Health Board Cork Mater Misericordiae Hospital Dublin 7 DSS Dublin Ltd. Ireland University College Dublin Ireland Mary Aikenhead School of Nursing St. Vincent’s Hospital Dublin Blackrock Clinic Dublin Borders Community Health Services NHS Trust Britain James Connolly Memorial Hospital Blanchardstown Dublin 15 Kildare and West Wicklow Mental Health Service for People with A Learning Disability Eastern Health Board Dublin Health Research Board Dublin General Practice Research Unit The Medical Centre Dungloe Dept. of Clinical Biochemistry Our Lady’s Hospital for Sick Children Crumlin Dublin 12

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Stepwise selection of perceptual texture features 7th

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7th Joint IAPR International Workshop on Structural and Syntactic Pattern Recognition, SSPR 1998 and 2nd International Workshop on Statistical Techniques in Pattern Recognition, SPR 1998

作者： Grau, Antoni Aranda, Joan Climent, Joan Dept. Of Computer Engineering and Automatic Control Polytechnic University of Catalonia Spain

ISBN: (纸本)3540648585

In computer vision, texture plays an important role. In this work we propose five human perceptual texture features heuristically extracted. Since a modeling can not be obtained from these features, we use a discriminant analysis technique to examine the discriminant power of each texture descriptor in order to select the most relevant. This task is done by a stepwise inclusion of variables indicating, furthermore, whether all of them are valuable and necessary producing a set of optimal discriminant variables. These selection procedures have been tested using Brodatz texture images, a benchmark in texture analysis. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Discriminant analysis

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A numerical algorithm for implementing the single-stage maximization criterion for multichannel blind deconvolution 9

A numerical algorithm for implementing the single-stage maxi...

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9th European Signal Processing Conference, EUSIPCO 1998

作者： Ohno, Shuichi Inouye, Yujiro Tanebe, Kazuaki Dept. of Mathematics and Computer Science Shimane University Shimane690-0823 Japan Dept. of Electronic and Control Systems Engineering Shimane University Shimane690-0823 Japan Dept. of Systems Engineering Osaka University Osaka560 Japan

We give an algorithm for the single-stage maximization criterion to attain multichannel blind deconvolution. This criterion determines the coefficients of equalizers for all channels simultaneously. However, the original maximization criterion has many constrains so that it is difficult to directly implement it as a numerical algorithm. By exploiting pre-whitening and lattice representations of paraunitary systems, we can reduce the original maximization problem into a simple constraint-free one and then present a stochastic gradient algorithm.

关键词： Stochastic systems

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