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1999 IEEE Region 10 Conference, TENCON 1999

作者： Kim, Young-Jo Choi, Jung-Soo Kim, Young-Seok Dept. of Control and Instrumentation Engineering Yuhan College 1 SS-34Gyean-Dong Sosa-Ku Pucheon-Si Kyunggi-Do Korea Republic of School of Electrical and Computer Engineering Inha University 253 Yonghyun-Dong Nam-Ku Incheon402-75 1 Korea Republic of

ISBN: (纸本)0780357396

When the air-gap flux is saturated, the conventional adaptive speed estimator cannot remove the influence of the nonlinear inductance variation. Without speed sensors, it is difficult to identify inductance variation using a reactive power model because the model contains a rotor speed term in itself In this paper, we propose a novel speed estimator having hybrid architecture in order to estimate both the rotor speed and the inductance variation simultaneously when the induction motor is operated under the saturation condition. The proposed estimator consists of the error between the flux induced from the stator voltage equation and the flux estimated from the rotor flux observer. Introducing the correction term into the estimator increases the estimation ability of the conventional speed estimator even though the motor flux is saturated. The convergence of the speed estimation error is examined by simulation. Furthermore, the experimental results show the validity of the proposed method. © 1999 IEEE.

关键词： Induction motors

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A Reliable control System for an Underwater Hidrojet Explorer Camera

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IFAC Proceedings Volumes 1999年第2期32卷 8261-8266页

作者： J. Amat R. Villà J. Aranda Institut de Robòotica Industrial IRI (UPC-CSIC) Dept. Automatic Control and Computer Engineering (UPC). Pau Gargallo 5. 08028 Barcelona Spain

Access to restricted spaces underwater requires a small unencumbered camera. A low cost solution has been envisaged. It consists of an hermetic capsule enclosing the camera and lights, joined to the host by an umbilical. Along the umbilical go six water carrying ducts. Three of them end at backwards pointing nozzles located at the capsule body. The jets of water flowing from the nozzles are controlled and their forces allow some restricted positioning of the camera. Another three ducts end at nozzles located some distance up the umbilical, and allow greater maneuverability.

关键词： Marine systems stereovisions tracking systems

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D-step-ahead nonlinear predictors using neural networks

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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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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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Bas-relief ambiguity

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International Journal of computer Vision 1999年第1期35卷 33-44页

作者： Belhumeur, Peter N. Kriegman, David J. Yuille, Alan L. Center for Comp. Vision and Control Dept. of Electrical Engineering Yale University New Haven CT 06520 United States Beckman Institute Department of Computer Science Univ. of Illinois Urbana-Champaign Urbana IL 61801 United States Smith-Kettlewell Eye Res. Institute San Francisco CA 94115 United States

When an unknown object with Lambertian reflectance is viewed orthographically, there is an implicit ambiguity in determining its 3-d structure: we show that the object's visible surface f(x, y) is indistinguishable from a `generalized bas-relief' transformation of the object's geometry, f¯(x, y) = λf(x, y)+μx+vy, and a corresponding transformation on the object's albedo. For each image of the object illuminated by an arbitrary number of distant light sources, there exists an identical image of the transformed object illuminated by similarly transformed light sources. This result holds both for the illuminated regions of the object as well as those in cast and attached shadows. Furthermore, neither small motion of the object, nor of the viewer will resolve the ambiguity in determining the flattening (or scaling) λ of the object's surface. Implications of this ambiguity on structure recovery and shape representation are discussed.

关键词： Object recognition

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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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