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American control Conference (ACC)

作者： K. Galkowski W. Paszke B. Sulikowski E. Rogers S. Xu J. Lam D.H. Owens Institute of Control and Computation Engineering University of Zielona Góra Poland Institute of Control and Computation Engineering University of Zielona Gόra Poland Department of Electronics and Computer Science University of Southampton UK Department of Mechanical Engineering University of Hong Kong China Department of Automatic Control and Systems Engineering University of Sheffield UK

In this paper we give new results on the analysis and control of differential linear repetitive processes, which are a distinct class of 2D linear systems of both systems theoretic and applications interest. The new results relate to stability and control in the presence of uncertainty in the process state space model. The family of control laws used has a well defined physical basis in terms of the underlying process dynamics.

关键词： control systems Linear systems Stability analysis Algorithm design and analysis automatic control Iterative algorithms Optimal control System testing control engineering computing computer science

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control of discrete linear repetitive processes with application to a material rolling process

Control of discrete linear repetitive processes with applica...

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European control Conference (ECC)

作者： B. Sulikowski K. Galkowski E. Rogers D. H. Owens Institute of Control and Computation Engineering University of Zielona Góra Poland Department of Electronics and Computer Science University of Southampton Southampton SO17 1BJ UK Department of Automatic Control and Systems Engineering University of Sheffield UK

Repetitive processes are a distinct class of 2D systems of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard or 2D systems theory. Here we give new results on the design of physically based feedback control laws. These results relate to design for performance and are illustrated on data for a model which arises in the modelling of a physical process.

关键词： Stability analysis Process control Asymptotic stability Numerical stability Linear systems Feedforward neural networks Frequency modulation

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Randomized algorithms for semi-infinite programming problems

Randomized algorithms for semi-infinite programming problems

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European control Conference (ECC)

作者： Vladislav B. Tadić Sean P. Meyn Roberto Tempo Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Illinois USA IEIIT-CNR Politecnico di Torino Torino Italy

In this paper, we explore the possibility of applying Monte Carlo methods (i.e., randomization) to semi-infinite programming problems. Equivalent stochastic optimization problems are derived for a general class of semi-infinite programming problems. For the equivalent stochastic optimization problems, algorithms based on stochastic approximation and Monte Carlo sampling methods are proposed. The asymptotic behavior of the proposed algorithms is analyzed and sufficient conditions for their almost sure convergence are obtained.

关键词： Programming Approximation algorithms Optimization Approximation methods Stochastic processes Monte Carlo methods Algorithm design and analysis

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An overview of software cybernetics

An overview of software cybernetics

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IEEE International Workshop on Software Technology and engineering Practice (STEP)

作者： Kai-Yuan Cai J.W. Cangussu R.A. DeCarlo A.P. Mathur Department of Automatic Control Beijing Aeronautics and Astronautics University Beijing China Department of Computer Science University of Texas Dallas Richardson TX USA Department of Electrical and Computer Engineering Purdue University West Lafayette IN USA Department of Computer Science Purdue University West Lafayette IN USA

Software cybernetics explores the interplay between software and control and is motivated by the fundamental question whether or not and how software behavior can be controlled. In this paper, we formulate the underlying motivations and ideas of software cybernetics and review various existing research topics in this emerging area, including feedback mechanisms in software processes, bisimulation and controllability, adaptive software, software synthesis, software test process control, and adaptive testing. We identify software rejuvenation and performance control, software fault-tolerance, logical foundation for control systems, and communication complexity for control systems as potential research topics. Several on-going research projects are also summarized.

关键词： Cybernetics Communication system control control systems Programmable control Adaptive control Software testing Communication system software Software performance Feedback controllability

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Entropy vector median filter

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1st Iberian Conference on Pattern Recognition and Image Analysis, IbPRIA 2003

作者： Lukac, Rastislav Smolka, Bogdan Plataniotis, Konstantinos N. Venetsanopoulos, Anastasios N. Slovak Image Processing Center Jarkova 343 Dobsina049 25 Slovakia Department of Automatic Control Silesian University of Technology Akademicka 16 Str Gliwice44-101 Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 10 King’s College Road Toronto Canada

ISBN: (纸本)3540402179

In this paper, a new adaptive multichannel filter for the detection and removal of impulsive noise, bit errors and outliers in digital color images is provided. The proposed nonlinear filter takes the advantages of the concept of the local entropy contrast and the robust order-statistics theory. The new entropy based vector median is computationally attractive, robust for a wide range of the impulsive noise corruption and significantly improves the signal-detail preservation capability of the standard vector median filter. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Impulse noise

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Fault detection of non-linear systems based on multi-form quasi-armax modeling and its application to the ship benchmark

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IFAC Proceedings Volumes 2003年第16期36卷 1047-1052页

作者： K. Kumamaru K. Inoue Y. Hosoyamada T. Söerström Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Kawazu 680-4 Iizuka 820-8502 Fukuoka Japan Department of Automatic Control and System Analysis Institute of Technology Uppsala University P.O.Box 27 Uppsala Sweden

This paper is concerned with an application study of model-based fault detection method to a ship propulsion system. When modeling the object system, Quasi-ARMAX model with multi-model form is used. In this model, the system non-linearity is incorporated into model parameters by using non-linear non-parametric models (NNMs). Kullback discrimination Information (KDI) is introduced as fault detection index to evaluate the distortion in identified model, which is caused by a fault. The effectiveness of the method is verified through simulation studies on the ship propulsion system.

关键词： Fault detection Kullback discrimination information non-linear system parameter estimation quasi-ARMAX model

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Noisy heart sequences filtering by optimal median based operators 5

Noisy heart sequences filtering by optimal median based oper...

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5th IFAC Symposium on Modelling and control in Biomedical Systems 2003

作者： Lukac, Rasto Smolka, Bogdan Zavarsky, Pavol Plataniotis, Kostas N. Venetsanopoulos, Anastasios N. Slovak Image Processing Center Jarkova 343 Dobsina049 25 Slovakia Department of Automatic Control Silesian University of Technology Akademicka 16 Str. Gliwice44-101 Poland Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka940-2188 Japan Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Canada

Bit errors and impulses introduced into cardiographic image sequences prohibit to process and evaluate the heart dynamics correctly. Thus, biomedical imaging such as vascular imaging and quantification of heart dynamics is closely related to digital filtering. We provide three-dimensional impulse detection based adaptive median filters designed to perform the optimal filtering situation, where the robust median filter affects only noisy samples, whereas the desired image features remains unchanged. The proposed method holds excellent preserving characteristics and takes the advantage of the superposition property despite the nonlinearity of the median filtering. Copyright © 2003 IF AC.

关键词： Median filters

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Practical evaluation of messages latencies in CAN

Practical evaluation of messages latencies in CAN

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： J. Gamiz J. Samitier J.M. Fuertes O. Rubies UE de Electronica EU d'Enginyeria Técnica UPC Barcelona Spain Department Electronica Universitat de Barcelona Barcelona Spain Automatic Control & Computer Engineering Department Technical University of Catalonia Barcelona Spain

In the area of process automation it is increasingly frequent to find control loops that close through communication networks, giving as a result what we know as distributed control systems. The CAN fieldbus (controller area network) is a solid industrial network, with a high baud rate and a capacity for error detection that makes it ideal for aggressive electromagnetic environments. The special idiosyncrasy of CAN, with protocols based on message priority, makes it especially interesting for the implementation of real-time control systems. Here, a CAN node realization is presented. This is useful for industrial and/or educational applications because it allows the study and analysis of the delays suffered by the messages. It is based on a model for the planning of deadline monotonic (DM) type tasks in a global system controlled by CANalyzer. The calculation of the worstcase delay has been carried out by means of the jCAN1 software tool, previously validated on a specific theoretical example. Finally, the results are evaluated and verified, and discussed with reference to the practical results obtained in a multi-node system constituted by a group of identical nodes to the one designed here.

关键词： Delay automatic control Communication system control control systems Electrical equipment industry Automation Communication networks Distributed control Field buses Solids

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Weighted vector median optimization

Weighted vector median optimization

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IEEE Region 8 International Symposium on Video/Image Processing and Multimedia Communications (EURASIP)

作者： R. Lukac K.N. Plataniotis B. Smolka A.N. Venetsanopoulos Slovak Image Processing Center Dobsina Slovakia Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto Toronto Canada Department of Automatic Control Silesian University of Technology Gliwice Poland

In this paper, a vector generalization of weighted median optimization approaches is provided. The proposed optimized weighted vector median filters utilize the relationship between standard median filter and vector median filter and also take the advantage of the generalized adaptive optimization algorithms initially developed for weighted median filters.

关键词： Adaptive filters Image processing Color Filtering Working environment noise Colored noise Vectors Linear approximation Strontium Educational institutions

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Generalized entropy vector filters

Generalized entropy vector filters

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IEEE Region 8 International Symposium on Video/Image Processing and Multimedia Communications (EURASIP)

作者： R. Lukac K.N. Plataniotis B. Smolka A.N. Venetsanopoulos Slovak Image Processing Center Dobsina Slovakia Department of Automatic Control Silesian University of Technology Gliwice Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto Toronto Canada

We provide new adaptive multichannel filtering schemes for the detection and removal of impulsive noise, bit errors and outliers in digital color images. The proposed nonlinear filter is based on the generalized multichannel concept of the local entropy contrast and the robust order-statistics theory. The proposed entropy based directional distance filter is computationally attractive, robust for a wide range of the impulsive noise corruption and significantly improves the signal-detail preservation capability of the standard multichannel filters outputting the lowest ranked vector as the output sample.

关键词： Entropy Color Filtering Noise robustness Smoothing methods Image processing Colored noise Nonlinear filters Working environment noise Strontium

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