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IEEE International Symposium on Intelligent control (ISIC)

作者： Weimin Wu Hongye Su Jian Chu W.M. Wonham National Laboratory of Industrial Control Technology & Institute of Advanced Process Control University of Zhejiang Hangzhou China Department of Electrical and Computer Engineering University of Toronto Toronto ONT Canada

Usually, the maximally permissive control of Petri nets with an OR-logic constraint is difficult to implement. In this paper, OR-logic is easily enforced using a colored Petri net. A colored Petri net place, named colored monitor place, is designed to monitor the states of constraints. A so-called guard function of colored Petri nets that maps certain transitions into a Boolean expression is suitably defined on the colored sets. The maximally permissive control is then obtained via the guard function. In addition, a constraint transformation method for marked graphs with uncontrollable transitions is proposed.

关键词： Petri nets Vectors control systems Laboratories Industrial control Process control computerized monitoring Logic Glass Force control

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Very fast phase angle estimation algorithm for a single-phase system having sudden phase angle jumps

Very fast phase angle estimation algorithm for a single-phas...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Hong-Seok Song Kwanghee Nam P. Mutschler Division of Electrical and Computer Engineering POSTECH University Pohang South Korea Department of Power Electronics and Control of Drives Darmstadt University of Technology Darmstadt Germany

This work proposes a very fast phase angle estimation algorithm for a single-phase system under a sudden phase angle jump condition. When a source voltage changes in a step manner, the normal phase angle detector, such as a phase locked loop (PLL) and a (low pass) filter, typically generates phase delay and results in a sluggish response, and causes some time-critical machine to malfunction. This work proposes a method of estimating the fundamental component, the phase angle and the frequency of a single-phase line voltage without a significant delay, even when the amplitude and the phase angle of the line voltage changes in a step manner, by using the weighted least-squares estimation (WLSE) method with the covariance resetting technique. An example application of a single-phase pulse width modulation (PWM) rectifier for a traction is presented in an appendix. This method can be applied to uninterruptable power supply (UPS), PWM rectifier, active filters, etc.

关键词： Phase estimation Pulse width modulation Voltage Delay estimation Frequency estimation Phase locked loops Active filters Amplitude estimation Rectifiers Phase detection

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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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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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NONSINGULAR TERMINAL SLIDING MODE control OF A CLASS OF NONLINEAR DYNAMICAL SYSTEMS

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IFAC Proceedings Volumes 2002年第1期35卷 161-165页

作者： Xinghuo Yu Man Zhihong Yong Feng Zhihong Guan Faculty of Informatics and Communication Central Queensland University Rockhampton QLD 4702 Australia School of Computer Engineering Nanyang Technological University Singapore Department of Electrical Engineering Harbin Institute of Technology Harbin 150006 China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 China

In this paper, a nonsingular terminal sliding mode concept is introduced for the control of a class of nonlinear dynamical systems. This nonsingular terminal sliding mode control not only enables the £nite time convergence of the system equilibrium, but also eliminates the singularity problem associated with conventional terminal sliding mode control. Simulations are presented to show the effectiveness of the design.

关键词： Sliding modes £nite time nonlinear systems stability

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Robustness analysis of the heat shock response in E. coli

Robustness analysis of the heat shock response in E. coli

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American control Conference (ACC)

作者： H. El-Samad M. Khammash H. Kurata J. Doyle Electrical and Computer Engineering Iowa State University Ames USA Department of Biochemical Science and Engineering Kyushu Institute of Technology Izuka Japan Control and Dynamical Systems California Institute of Technology Pasadena USA

The bacterial heat shock response refers to the mechanism by which bacteria react to a sudden increase in the ambient temperature of growth. The consequences of such an unmediated temperature increase at the cellular level is the unfolding, misfolding, or aggregation of cell proteins, which threatens the life of the cell. Cells respond to the heat stress by initiating the production of heat-shock proteins whose function is to refold denatured proteins into their native states. The heat shock response, through the elevated synthesis of molecular chaperones and proteases, enables the repair of protein damage and the degradation of aggregated proteins. In a previous work (Kurata et al., 2001), we have devised a dynamic model for the heat shock response in E. coli. In the present paper, we provide a thorough discussion of the dynamical nature of this model. We use sensitivity analysis and simulation tools to illustrate the remarkable efficiency, robustness, and stability of the heat shock response system.

关键词： Robustness Electric shock Proteins Microorganisms Temperature Robust stability Stress Production Degradation Sensitivity analysis

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Global optimal realizations of finite precision digital controllers

Global optimal realizations of finite precision digital cont...

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IEEE Conference on Decision and control

作者： Jun Wu Sheng Chen Gang Li Jian Chu National Key Laboratory of Industrial Control Technology University of Zhejiang Hangzhou China Department of Electronics and Computer Science University of Southampton Southampton UK School of Electrical and Electronic Engineering Nanyang Technological University Singapore

ISBN: (纸本)0780375165

The paper analyzes global solutions to the optimal digital controller realization problem based on maximizing a finite word length (FWL) closed-loop stability measure. For each closed-loop eigenvalue, a single-pole FWL stability function is first introduced, and a single-pole FWL stability measure is then defined as the maximum of the corresponding single-pole stability function over all the controller realizations. It is shown that the minimum of the single-pole stability measures for all the closed-loop eigenvalues is an upper bound of the optimal value for the optimal realization problem. An analytical method to compute a single-pole stability measure is developed, and an expression for all the realizations which achieve a given single-pole measure is derived. When a realization, which is a solution of the minimum single-pole measure, further satisfies the condition that the values of all its single-pole stability functions are not less than the minimum single-pole measure, the minimum single-pole measure is the optimal value of the optimal realization problem and this realization is the solution for the optimal realization problem. A computationally simple algorithm is presented.

关键词： Optimal control Digital control control systems Stability analysis Eigenvalues and eigenfunctions Uncertainty Laboratories Industrial control Industrial electronics computer science

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On global synchronization of chaotic systems

On global synchronization of chaotic systems

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American control Conference (ACC)

作者： Xiaoxin Liao Guanrong Chen H.O. Wang Department of Control science and Engineering Huazhong University of Science and Technology Wuhan P. R. China Department of Electronic Engineering City University of Hong Kong Kowloon Hong Kong P. R. China Department of Electrical and Computer Engineering Duke University Durham NC USA

The paper discusses the basic problem of chaos synchronization and derives some simple yet explicit conditions for its global convergence verification.

关键词： Chaos control systems Nonlinear control systems Convergence Error correction Equations Laboratories Intelligent control Jacobian matrices Lyapunov method

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Random walk approach to noise reduction in color images 9th

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9th International Conference on computer Analysis of Images and Patterns, CAIP 2001

作者： Smolka, B. Szczepanski, M. Plataniotis, K.N. Venetsanopoulos, A.N. Silesian University of Technology Department of Automatic Control 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)9783540425137

In this paper we propose a new algorithm of noise reduction in color images. The new technique of image enhancement is capable of reducing impulsive and Gaussian noise and it outperforms the standard methods of noise reduction. In the paper a smoothing operator, based on a random walk model and on a fuzzy similarity measure between pixels connected by a digital self avoiding path is introduced. The efficiency of the proposed method was tested on the test color image using the objective image quality measures and the results show that the new method outperforms standard noise reduction algorithms. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Noise abatement

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Fast modified vector median filter 9th

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9th International Conference on computer Analysis of Images and Patterns, CAIP 2001

ISBN: (纸本)9783540425137

A new filtering approach designed to eliminate impulsive noise in color images, while preserving fine image details is presented in this paper. The computational complexity of the new filter is signif- icantly lower than that of the Vector Median Filter. The comparison shows that the new filter outperforms the VMF, as well as other standard procedures used in color image processing, when the impulse noise is to be eliminated. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Impulse noise

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