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15th World Congress of the International Federation of automatic control, 2002

作者： Galkowski, K. Paszke, W. Sulikowski, B. Rogers, E. Xu, S. Lam, J. Lin, Z. Owens, D.H. Institute of Control and Computation Engineering University of Zielona Gora Poland Department of Electronics and Computer Science University of Southampton SouthamptonSO17 1BJ United Kingdom Departament of Electrical and Computer Engineering University of Alberta EdmontonABT6G 2V4 Canada Department of Mechanical Engineering University of Hong Kong Hong Kong School of EEE Nanyang Technological University Nanyang Ave. Singapore639798 Singapore Department of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom

ISBN: (纸本)9783902661746

Repetitive processes are a distinct class of 2D linear systems with applications in areas ranging from long-wall coal cutting and metal rolling operations through to iterative learning control schemes. The main feature which makes them distinct from other classes of 2D linear systems is that information propagation in one of the two independent directions only occurs over a finite duration. This, in turn, means that a distinct systems theory must be developed for them, which can then be translated into efficient routinely applicable controller design algorithms for applications domains. In this paper, we give the first significant results on a positive realness based approach to the analysis of these processes. Copyright © 2002 IFAC.

关键词： Linear systems

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On the modified weighted vector median filter

On the modified weighted vector median filter

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International Conference on Digital Signal Processing (DSP)

作者： B. Smolka M. Szczepanski K.N. Plataniotis A.N. Venetsanopoulos Department of Automatic Control Akademicka 16 Str Silesian University of Technology Gliwice Poland Department of Electrical and Computer Engineering University of Toronto Toronto Canada

A new filtering approach designed to eliminate impulsive noise in color images, while preserving fine image details is presented. The computational complexity of the new filter is significantly lower than that of the weighted vector median filter (WVMF). The comparison shows that the new filter outperforms the WVMF, as well as other standard procedures used in color image filtering for the removal of impulsive noise.

关键词： Color Noise reduction Educational institutions Strontium Colored noise Tiles Ear Digital signal processing Nonlinear filters Length measurement

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A Virtual Laboratory for Macro Universities Using Mobile Agent Techniques

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International Journal of computer Processing of Languages 2002年第1期15卷 1-18页

作者： C. R. DOW C. C. SHEN J. H. LIN S. C. CHEN C. Y. LIN Department of Information Engineering and Computer Science Feng Chia University Taichung Taiwan R. O. C. Department of Automatic Control Engineering Feng Chia University Taichung Taiwan R. O. C.

This work designs, develops and implements a virtual laboratory for digital circuit design in Macro Universities that can create a rich learning environment for students from all over the world. Our system consists of four parts: agent execution environments, mobile agents, wrapper agents and experimental platforms. Mobile agents are received and executed in the agent execution environment, which provides locations and other resources for the mobile agents. The wrapper agent acts as a middleware for the mobile agent and the experimental platform. The experimental platform is an existing application program that could be a learning program, such as a CAI tool or a design tool, such as a CAD system. The major merit of our system is that it enables network capability for a standalone program without the need for the source code of the original program. The prototype of our virtual laboratory is targeted at a digital circuit laboratory. Experimental results demonstrate the feasibility of our approach.

关键词： Virtual Laboratory Macro University Mobile Agent Aglet Wrapper

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STABILIZATION AND ROBUST control OF METAL ROLLING MODELED AS A 2D LINEAR SYSTEM

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IFAC Proceedings Volumes 2002年第1期35卷 185-190页

作者： K. Galkowski W. Paszke E. Rogers D.H. Owens Institute of Control and Computation Engineering University of Zielona Gora Poland Department of Electronics and Computer Science University of Southampton Southampton SO17 1BJ UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD UK

Repetitive processes are a distinct class of 2D linear systems with applications in areas ranging from long-wall coal cutting and metal rolling operations through to iterative learning control schemes. The main feature which makes them distinct from other classes of 2D linear systems is that information propagation in one of the two independent directions only occurs over a finite duration. This, in turn, means that a distinct systems theory must be developed for them, which can then be translated (if appropriate) into efficient routinely applicable controller design algorithms for applications domains. In this paper, we give some new results on LMI based stabilization and robust control of so-called discrete linear repetitive processes and illustrate them by application to a metal rolling process.

关键词： 2D linear systems metal rolling robust control

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Model reference parametric adaptive iterative learning control 15th

Model reference parametric adaptive iterative learning contr...

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15th World Congress of the International Federation of automatic control, 2002

作者： Yu, H. Deng, M. Yang, T.C. Owens, D.H. School of Engineering and Computer Science Exeter University ExeterEX4 4QF United Kingdom School of Engineering and Information Technology Sussex University BrightonBN1 9QT United Kingdom Department of Automatic Control and Systems Sheffield University SheffieldS1 3JD United Kingdom

ISBN: (纸本)9783902661746

Most of iterative learning control (ILC) methods requires that the relative degree of the plant is less than 2 for a linear system or the plant is passive for a non-linear system. A new model reference parametric adaptive iterative learning control using the command generator tracker (CGT) theory is proposed in this paper. The method can be applied to control a plant with a higher relative degree and it only requires to iteratively adjust nm + 2 parameters for an SISO plant. Therefore, the ILC control system is very simple. The proposed method is in the spirit of simple adaptive control which has received intensive researches during past two decades. Simulation results show the effectiveness and usefulness of the proposed method. Copyright © 2002 IFAC.

关键词： Model reference adaptive control

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Delay differential control theory applied to differential linear repetitive processes

Delay differential control theory applied to differential li...

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American control Conference (ACC)

作者： E. Rogers K. Galkowski D.H. Owens Department Electronics and Computer Science University of Southampton Southampton UK Institute of Control and Computation Engineering University of Zielona Gora Zielona Gora Poland Dept Automatic Control and Systems Engineering University of Sheffield Sheffield UK

Differential linear repetitive processes are a distinct class of 2D continuous-discrete linear systems of both applications and systems theoretic interest. In applications, they arise in iterative learning control schemes and in iterative solution algorithms for nonlinear dynamic optimal control algorithms based on the maximum principle. Repetitive processes cannot be analysed/controlled by direct application of the existing systems theory and hence a 'mature' systems theory must be developed for them followed (where appropriate) by onward translation into efficient controller design algorithms. This paper continues the development of the former area by developing some significant new results on the application of currently available delay differential systems theory to these processes.

关键词： Delay control theory control systems Iterative algorithms automatic control Ear Metals industry Optimal control System testing computer science

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An algebraic approach to iterative learning control

An algebraic approach to iterative learning control

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IEEE International Symposium on Intelligent control (ISIC)

作者： J. Hatonen K.L. Moore D.H. Owens Automatic Control and Systems Engineering Department University of Sheffield Sheffield UK Systems Engineering Laboratory University of Oulu Linnanmaa Finland Department of Electrical and Computer Engineering College of Engineering Utah State University Logan UT USA

In this paper discrete-time iterative learning control (ILC) systems are analysed from an algebraic point of view. The algebraic analysis shows that an ILC synthesis problem can be considered as a tracking problem of a multi-channel step-function. Furthermore, the plant to be controlled is a static multivariable plant. Another major contribution of this paper is a general convergence theory of ILC systems in terms of their closed-loop poles. This convergence theory shows that time-variant ILC control laws should be typically used instead of time-invariant control laws in order to guarantee good transient tracking behaviour. Simulations high-light the different theoretical findings in this paper.

关键词： Iterative methods automatic control control systems Convergence Systems engineering and theory Intelligent systems Educational institutions Laboratories control system synthesis Modeling

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Enhancement of the DNA microarray chip images

Enhancement of the DNA microarray chip images

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International Conference on Digital Signal Processing (DSP)

作者： M.K. Szczepanski B. Smolka K.N. Plataniotis A.N. Venetsanopoulos 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

In this paper a novel method of noise reduction in color images is presented. The new technique is capable of attenuating both impulsive and Gaussian noise, while preserving and even enhancing the sharpness of the image edges. Extensive simulations reveal that the new method outperforms significantly the standard techniques widely used in multivariate signal processing. In this work we apply the new noise reduction method for the enhancement of the images of gene chips. We demonstrate that the new technique is capable of reducing various kinds of noise present in microarray images and that it enables efficient spot location and estimation of the gene expression level, due to the smoothing effect and preservation of the spot edges. This paper contains the comparison of the new technique of noise reduction with the standard procedures used for the processing of vector valued images, as well as examples of the efficiency of the new algorithm when applied to typical microarray images.

关键词： DNA Probes Fluorescence Noise reduction Gene expression Sequences Surface emitting lasers Strontium Educational institutions Color

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New technique for the restoration of noisy color images

New technique for the restoration of noisy color images

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International Conference on Digital Signal Processing (DSP)

作者： B. Smolka M.K. Szczepanski K.N. Plataniotis A.N. Venetsanopoulos 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

In this paper we propose a new efficient algorithm of noise suppression in color images. The new technique of multichannel image enhancement is capable of reducing impulsive and Gaussian noise and it outperforms the standard methods of noise reduction. In this paper a new smoothing operator, based on a random walk model and on a fuzzy similarity membership function of pixels connected by digital paths is introduced. The efficiency of the proposed method has been tested on the standard color images using the widely used objective image quality measures.

关键词： Image restoration Colored noise Color Image enhancement Gaussian noise Noise reduction Smoothing methods Testing Measurement standards Image quality

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ROBUST SPECIFICATION INFLUENCE ON FEEDBACK control STRATEGIES

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IFAC Proceedings Volumes 2002年第1期35卷 425-430页

作者： M. Gil-Martínez M. García-Sanz System Engineering and Automation Group Electrical Engineering Department University of La Rioja. Luis de Ulloa 20 26004 Logroño SPAIN Automatic Control and Computer Science Department Public University of Navarra. Campus Arrosadía 31006 Pamplona SPAIN

The feedback control structures are required in the presence of any kind of uncertainty. The benefits of the feedback are mainly paid with an excessive bandwidth that amplifies the sensor noise, saturating the actuators. This implies the necessity of design tradeoffs highly transparent from the Quantitative Feedback Theory. Supposing a given uncertainty for a plant, the set of performance and stability requirements will condition the problem solution. Taking advantage of the QFT bound typology and formulation, the contribution of the robust specification values to their simultaneous achievement will be analysed and particularly as regards the challenging task of the controller design.

关键词： Robust control Uncertain dynamical systems Quantitative Feedback Theory

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