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IEEE International Symposium on Industrial electronics (ISIE)

作者： Z. Mihajlovic A. Goluban M. Zagar Department of Electronics Microelectronics Computer and Intelligent Systems Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

This paper describes B-spline interpolation and compares it with other reconstruction methods, especially in three-dimensional space. We first consider the B-spline bases in the terms of convolution in signal processing. The presented analysis requires careful usage of continuous and discrete representation of B-spline. Emphasis is given to the important difference between B-spline interpolation and approximation. The difference is shown through frequency domain analysis, so we derive frequency responses of the B-spline interpolation and approximation. We conclude by demonstrating the use of several reconstruction filters and appropriate gradient estimators in volume rendering. Exact reconstruction in volume visualization is very important in many industrial applications, such as material cavity control.

关键词： Frequency domain analysis Spline Interpolation Image reconstruction Convolution Filters Polynomials Data visualization Frequency response Microelectronics

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Higher order discretization of differential linear repetitive processes

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IFAC Proceedings Volumes 1999年第2期32卷 1903-1908页

作者： K. Galkowski E. Rogers A. Gramacki J. Gramacki D.H. Owens Departments of Robotics and Software Engineering/Electronics and Informatics Technical University of Zielona Gora Poland. Department of Electronics and Computer Science University of Southampton Southampton SO17 1BJ UK School of Engineering and Computer Science University of Exeter Exeter EX4 4QF UK.

Differential linear repetitive processes are a class of linear systems which can be used, for example, to model industrial processes such as long-wall coal cutting operations. The key feature of interest in this paper is the fact that information propagation in one of the two separate directions in such processes evolves continuously over a finite fixed duration and in the other it is, in effect, discrete. This paper develops discrete approximations for the dynamics of these processes and examines the effects of the approximation techniques used on two key control related properties, i.e. stability and the 2D linear systems structure of the resulting discrete stale space models.

关键词： Repetitive dynamics discrete approximations stability 2D linear systems

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The B-spline interpolation in visualization

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Journal of Computing and Information Technology 1999年第3期7卷 245-253页

作者： Mihajlović, Željka Goluban, Alan Department of Electronics Microelectronics Computer and intelligent Systems Faculty of Electrical Engineering arid Computing University of Zagreb Unska 3 Zagreb10 000 Croatia Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Unska 3 Zagreb10 000 Croatia

The volume data is generally in the form of the large array of numbers. In order to render the object hidden in the volumetric data, we need to reconstruct or interpolate data values between the samples. The novelty presented in this paper is B-spline interpolation in the volumetric space. We show that this approach is better than currently used methods. We also present a hybrid approach, analyze this approach in frequency domain and compare it to B-spline interpolation. To enhance the quality during the volume visualization process it is important to enhance the quality of the reconstruction. It is of crucial importance to explore different undesired effects. If better reconstruction is performed the more accurate result of volume visualization process is achieved.

关键词： Volume rendering

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Lyapunov stability theory for linear repetitive processes - The 2D equation approach

Lyapunov stability theory for linear repetitive processes - ...

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1999 European control Conference, ECC 1999

作者： Benton, S.E. Rogers, E. Owens, D.H. Department of Electronics and Computer Science University of Southampton SouthamptonSO17 1BJ United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom

ISBN: (纸本)9783952417355

This paper develops the basis of a so-called 2D Lyapunov equation based approach to the stability analysis of discrete linear repetitive processes. The key feature of this equation is that, in contrast to the so-called ID Lyapunov equation approach, it is defined in terms of matrices with constant entries and has a 'similar' structure to the Lyapunov equation for standard, or ID, discrete linear systems. Here it is shown that the 2D Lyapunov equation gives, in general, a characterization of stability which is sufficient but not necessary. Despite this deficiency, it is also shown how the 2D Lyapunov equation can be used to characterize stability margins and robustness to uncertainty in the model description - very important topics for which few results are currently available. Some areas for short to medium term further research are also briefly noted. © 1999 EUCA.

关键词： Linear systems

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Lyapunov stability theory for linear repetitive processes - The 1D equation approach

Lyapunov stability theory for linear repetitive processes - ...

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1999 European control Conference, ECC 1999

作者： Rogers, E. Gramacki, J. Gramacki, A. Galkowski, K. Owens, D.H. Department of Electronics and Computer Science University of Southampton SouthamptonSO17 1BJ United Kingdom Department of Robotics and Software Engineering Technical University of Zielona Gora ul. Podgorna 50 Zielona Gora65-246 Poland Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom

ISBN: (纸本)9783952417355

This paper reports further development of the so-called ID Lyapunov equation based approach to the stability analysis of differential linear repetitive processes. In particular, it is shown that this approach leads to stability tests which can be implemented by computations with matrices which have constant entries, and that if the example under consideration is stable then physically meaningful information concerning one key aspect of 'transient' performance is available for no extra cost. The computational efficiency of these new stability tests against alternatives is also discussed and some areas for short to medium term further research briefly noted. © 1999 EUCA.

关键词： Linear systems

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Dynamic process initial conditions in repetitive processes. controllability and stability analysis

Dynamic process initial conditions in repetitive processes. ...

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Information, Decision and control (IDC)

作者： K. Galkowski E. Rogers A. Gramacki J. Gramacki D.H. Owens Institute of Robotics and Software Engineering Technical University of Zielona Góra Zielona Gora Poland Department of Electronics and Computer Science Image Speech and Intelligent Systems Research Group University of Southampton Southampton UK Institute of Computer Engineering and Electronics Technical University of Zielona Góra Zielona Gora Poland School of Engineering Centre for Systems and Control Engineering University of Exeter Exeter UK

Repetitive, or multipass, processes are a class of 2D systems of both practical and algorithmic/theoretical interest whose dynamics cannot be analysed or controlled using standard (1D) systems theory. Recently it has been shown that the modelling of the boundary conditions, also known as the process initial conditions, is a crucial feature in the analysis and control of these processes. This paper presents some further results on the effects of so-called 'dynamic' process initial conditions on the controllability and stability properties of discrete linear repetitive processes. Previous work has shown that these dynamic process initial conditions alone can destroy the stability properties of these processes. Hence their effects must be 'adequately' accounted for the process modelling stage in order to ensure that subsequent analysis does not lead to incorrect results/conclusions. The main results developed in this paper can be summarised as follows. (i) Computationally efficient stability tests which can, in effect, be applied using standard, or 1D, linear systems tests. (ii) Characterisation of so-called pass controllability in the form of matrix rank based conditions. (iii) Conditions under which the dynamic process initial conditions can be selected to ensure stability and pass controllability.

关键词： Stability controllability System testing control system analysis Algorithm design and analysis control systems Boundary conditions Process control Standards development Linear systems

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MATLAB based tools for 2D linear systems with application to iterative learning control schemes

MATLAB based tools for 2D linear systems with application to...

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IEEE International Symposium on computer Aided control System Design (CACSD)

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

Repetitive processes are a distinct class of 2D systems of both theoretic and practical interest. For example, they arise in the study of industrial processes such as long-wall coal cutting operations and also in the modeling of classes of iterative learning control schemes. This paper describes the development of MATLAB based tools for control related analysis/controller design in the case of so-called discrete linear repetitive processes with particular emphasis on the iterative learning control application. Some areas for short to medium term further development are also briefly noted.

关键词： MATLAB Linear systems control systems Iterative algorithms Electrical equipment industry Industrial control Mathematical model Machining Metals industry Informatics

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Robust controller design for RTP system using structured uncertainty approach

Robust controller design for RTP system using structured unc...

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SICE Annual Conference

作者： Sang Kyung Lee Jong Hae Kim Do Chang Oh Hong Bae Park Department of Computer Applied Control Doowon Technical College Ansung South Korea Sensor Technology Research Center Kyungpook National University Taegu South Korea Department of Information Electronics and Communication Engineering Konyang University South Korea School of Electronic and Electrical Engineering Kyungpook National University Taegu South Korea

In this paper, we propose an robust controller design of rapid thermal processing (RTP) system using the structured uncertainty approach. Using the weighted mixed sensitivity function, we solve the robust stability problem against disturbance and temperature variation, and design a /spl mu/ controller using the curve fitting method against structured uncertainty. Finally, the simulation results are proposed to show the validity of the proposed method.

关键词： Robust control control systems Uncertainty Temperature control Robust stability Thermal stresses Communication system control Temperature sensors Ovens Semiconductor device modeling

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Observer-based fuzzy H/sup /spl infin// control for uncertain nonlinear systems with time delays

Observer-based fuzzy H/sup /spl infin// control for uncertai...

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American control Conference (ACC)

作者： Kap Rai Lee Jong Hae Kim Eun Tae Jeung Han O Yun Hong Bae Park Department of Computer Applied Control Doowon Technical College Ansung Gyeonggi South Korea Sensor Technology Research Center Kyungpook National University Taegu South Korea Department of Control and Instrument Engineering Changwon NatE28099l University Kyungnam South Korea Department of Electronics Kumi College Kumi Gyeongbuk South Korea School of Electronic and Electrical Engineering Kyungpook National University Taegu South Korea

ISBN: (纸本)0780349903

This paper presents the problem of observer-based fuzzy H/sup /spl infin// control for a class of uncertain nonlinear systems with time-varying delayed systems on the basis of Takagi-Sugeno fuzzy model. First, we design a fuzzy observer such that destination error system is globally, exponentially stable. Next, we design a fuzzy H/sup /spl infin// controller such that the closed loop system is globally, exponentially stable and achieves L/sub 2/ gain performance. The fuzzy control systems utilize the concept of the so-called parallel distributed compensation. A sufficient condition for the existence of robust fuzzy H/sup /spl infin// controllers and observers are given in terms of linear matrix inequalities (LMIs). The control gains can also be directly obtained from the LMI solutions.

关键词： Fuzzy control Fuzzy systems Nonlinear control systems Nonlinear systems Time varying systems Delay systems Takagi-Sugeno model control systems Closed loop systems Performance gain

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A parallel analog intelligent vision sensor with a variable receptive field

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Systems and computers in Japan 1999年第1期30卷 60-69页

作者： Yagi, Tetsuya Kameda, Seiji Iizuka, Kunihiko Faculty of Computer Science and System Engineering Kyushu Institute of Technology Iizuka 820-8502 Japan Advanced Technology Research Laboratories Sharp Tenri 632-0004 Japan Institute of Physiological Science Okazaki Japan Nagoya Institute of Technology Japan Institute of Electronics Information and Communication Engineers Japan Society of Instrument and Control Engineers Japan Japanese Neural Network Society Japan Association for Research in Vision and Opthalmology Japan Kyushu Institute of Technology Japan Advanced Technology Research Laboratories Tenri Japan

The retina is an intelligent vision sensor indispensable in real-time image information processing of animals. The parallel image processing function of the retina was realized in an analog CMOS integrated circuit (vision chip). The chip was implemented with a one-dimensional Laplacian-Gaussian receptive field the size of which can be controlled by external signals. Active pixel sensors were used in the sensor part of the chip where the light sensitivity can be controlled by varying the accumulation time. Circuits compensating for noise due to the mismatch of transistor characteristics were incorporated, and the experimental results verified that sufficiently accurate outputs can be obtained under natural illumination. The chip can effectively extract the spatial frequency bandwidth of the signal in the presence of noise. © 1999 Scripta Technica.

关键词： Analog VLSI Laplacian-Gaussian Offset compensation Parallel processing Variable receptive field Vision chip

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