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IEEE International Symposium on Industrial Electronics (ISIE)

作者： B. Smolka A. Chydzinski R. Lukac K.N. Plataniotsis A.N. Venetsanopoulos Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Gliwice Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto Toronto ONT Canada

In this paper a novel approach to the impulsive noise removal in color images is presented. The proposed technique employs the switching scheme based on the impulse detection mechanism using the so called peer group concept. Compared to the vector median filter, the proposed technique consistently yields better results in suppressing both the random-valued and fixed-valued impulsive noise. The main advantage of the proposed noise detection framework is its enormous computational speed, which enables efficient filtering of large images in real-time applications.

关键词： Nonlinear filters Vectors Colored noise Color Noise reduction automatic control computer science Strontium Educational institutions Filtering

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The system reliability analysis based on the relation of fuzzy infection

The system reliability analysis based on the relation of fuz...

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International Conference on control and Automation (ICCA)

作者： Chuan Sun Yongji Wang Xiangou Zhu Department of Mechanic and Dynamic Engineering HuangShi Polytechnic College Huangshi Hubei China Department of Automatic Control Huazhong University of Science and Technology Wuhan Hubei China College of Computer Science and Engineering WenZhou University Wenzhou Zhejiang China

In this paper, using the fuzzy theory and gray theory, a concept of the degree of fuzzy infection and a new reliability analysis method based on the relation of fuzzy infection were proposed, and the mathematical mode of series connection and parallel connection system was first set up and their rationalities were proven. An illustrational example was given to demonstrate the effectiveness of this theory.

关键词： Fuzzy systems Reliability theory Fuzzy control Fuzzy set theory Reliability engineering Educational institutions Sun control systems computer science Failure analysis

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Fast norm-optimal iterative learning control for industrial applications

Fast norm-optimal iterative learning control for industrial ...

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American control Conference (ACC)

作者： J. Ratcliffe L. van Duinkerken P. Lewin E. Rogers J. Hatonen T. Harte D. Owens School of Electronics and Computer Science University of Southampton Southampton UK Department of Applied Mathematics Delft University of Technnology Delft Netherlands Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK Systems Engineering Laboratory University of Oulu Oulu Finland

Norm-optimal iterative learning control has potential to significantly increase the accuracy of many trajectory tracking tasks which can be found in industry. The algorithm can achieve very low levels of tracking error and the number of iterations required to reach minimal error is small compared to many other iterative learning control algorithms. However, in the current format, the algorithm is not attractive to industry because it requires a large number of calculations to be performed at each sample instant. This implies that control hardware must be very fast which is expensive, or that the sample frequency must be reduced which can result in reduced performance. To remedy these problems, a revised version, fast norm-optimal iterative learning control is proposed which is significantly simpler and faster to implement. The new version is tested both in simulation and in practice on a three axis industrial gantry robot.

关键词： Industrial control control systems Trajectory Iterative algorithms Error correction Frequency Service robots Robotic assembly Systems engineering and theory Hardware

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Reduced-order model-based feedback controller design for subsonic cavity flows

Reduced-order model-based feedback controller design for sub...

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43rd AIAA Aerospace sciences Meeting and Exhibit

作者： Yuan, X. Caraballo, E. Yan, P. Özbay, H. Serrani, A. DeBonis, J. Myatt, J.H. Samimy, M. Collaborative Center of Control Science Ohio State University United States Department of Electrical and Computer Engineering Department of Mechanical Engineering United States Bilkent Univ. Dept. of Electrical and Electronics Eng. Ankara Turkey NASA Glenn's Quiet Aircraft Technology Program United States Air Force Research Laboratory Air Vehicles Directorate WPAFB United States

This paper explores feedback controller design for cavity flows based on reduced-order models derived using Proper Orthogonal Decomposition (POD) along with Galerkin projection method. Our preliminary analysis shows that the equilibrium of the POD model is unstable and a static output feedback controller cannot stabilize it. We develop Linear Quadratic (LQ) optimal state feedback controllers and LQ optimal observers for the linearized models. The linear controllers and observers are applied to the nonlinear system using simulations. The controller robustness is numerically tested with respect to different POD models generated at different forcing frequencies. An estimation for the region of attraction of the linear controllers is also provided.

关键词： Subsonic flow

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DSA image registration based on multiscale Gabor filters and mutual information

DSA image registration based on multiscale Gabor filters and...

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International Conference on Information and Automation (ICIA)

作者： Zhiguo Cao Xiaoxiao Liu Bo Peng Yiu-Sang Moon Key Laboratory of Ministry of Education for Image Processing and Intelligent Control Institute for Pattern Recognition and Artificial Intelligence Huazhong University of Science and Technology Wuhan China Department of Computer Science and Engineering Chinese University of Hong Kong New Territories Hong Kong China

In clinical practice, digital subtraction angiography (DSA) is a powerful technique for the visualization of blood vessels in X-ray image sequences. Different with traditional DSA image registration processes, in our proposed image registration method, the control points are selected from the vessel centerlines using multiscale Gabor filters, and mutual information (MI) is then taken as the similarity criterion to find the correspondences. Experimental results demonstrate our algorithm efficiently yields satisfying registration result for DSA images.

关键词： Image registration Gabor filters Mutual information Biomedical imaging Angiography Visualization Displacement control Blood vessels Image sequences Pixel

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Development of high speed PCB design techniques on industrial control computer motherboards

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Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (science and technology) 2005年第SUPPL.期36卷 738-742页

作者： Yang, Meng-Fei Zhou, Xin-Fa Ma, Fei Liu, Xin Sun, Zeng-Qi Laboratory of Intelligent Technology and Systems Department of Computer Science and Technology Tsinghua University Beijing 100083 China Beijing Institute of Control Engineering Beijing 100080 China

A design technique of high speed digital signal PCB and investigates simulation, and verification methods based on IBIS models for CompactPCI bus single board computers was developed. The results on real application s... 详细信息

关键词： computer motherboards High speed PCB IBIS model

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Generating multi-folded torus chaotic attractors

Generating multi-folded torus chaotic attractors

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International Conference on Physics and control

作者： Simin Yu Jinhu Lu Henry Leung Guanrong Chen College of Automation Guangdong University of Technology Guangzhou China Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy and Sciences Beijing China Department of Electrical and Computer Engineering University of Calgary AB Canada Department of Electronic Engineering City University of Hong Kong China

A systematic methodology for generating multi-folded torus chaotic attractors from a simple three-dimensional piecewise-linear system is presented in this paper. Theoretical analysis shows that multi-folded torus chaotic attractors can be created via alternative switching between two piecewise-linear systems. A novel circuit diagram is designed for physically creating multi-folded torus chaotic attractors. This is the first time in the literature to experimentally verify a maximum 9-folded torus chaotic attractor that is generated by an analog circuit.

关键词： Chaos Piecewise linear techniques Oscillators Laboratories Analog circuits Electric breakdown Bifurcation Educational institutions Automation automatic generation control

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Auto-tuning PID controller of Internet congestion control system

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Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural science Edition) 2005年第SUPPL.期35卷 67-70页

作者： Yang, Hongyong Zhang, Fuzeng Lin, Xiangze Zong, Guangdeng Department of Computer Science and Technology Yantai Normal College Yantai 264025 China Department of Automatic Control Engineering Southeast University Nanjing 210096 China Institute of Automation Qufu Normal University Qufu 273165 China

Internet congestion control system is considered as a closed-loop feedback system with time-delay. A proportional-integral-differential (PID) controller is then established as active queue management (AQM) scheme to adjust the congestion marked possibility at the links in Internet, whose parameters is auto-tuned by applying the minimization of an integral criterion for adapting the change of the network system. The simulations show that the new AQM scheme can control the size of the queue in the buffer to an expected length and has the robustness for the loading perturbation and the parameter change in the network.

关键词： Congestion control (communication)

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Transport of Mars-Crossing Asteroids from the Quasi-Hilda Region

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Physical Review Letters 2005年第23期94卷 231102-231102页

作者： Michael Dellnitz Oliver Junge Martin W. Lo Jerrold E. Marsden Kathrin Padberg Robert Preis Shane D. Ross Bianca Thiere Faculty of Computer Science Electrical Engineering and Mathematics University of Paderborn D-33095 Paderborn Germany Navigation and Mission Design Jet Propulsion Laboratory California Institute of Technology M/S 301-140L 4800 Oak Grove Drive Pasadena California 91109 USA Control and Dynamical Systems California Institute of Technology MC 107-81 Pasadena California 91125 USA Department of Aerospace and Mechanical Engineering University of Southern California Los Angeles California 90089 USA

We employ set oriented methods in combination with graph partitioning algorithms to identify key dynamical regions in the Sun-Jupiter-particle three-body system. Transport rates from a region near the 3∶2 Hilda resonance into the realm of orbits crossing Mars’ orbit are computed. In contrast to common numerical approaches, our technique does not depend on single long term simulations of the underlying model. Thus, our statistical results are particularly reliable since they are not affected by a dynamical behavior which is almost nonergodic (i.e., dominated by strongly almost invariant sets).

关键词： .graph orbits partitioning week ending Asteroids Preis Mars-Crossing Quasi-Hilda

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Virtual attractive-repulsive potentials for cooperative control of second order dynamic vehicles on the Caltech MVWT

Virtual attractive-repulsive potentials for cooperative cont...

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American control Conference (ACC)

作者： B.Q. Nguyen Yao-Ling Chuang D. Tung Chung Hsieh Zhipu Jin Ling Shi D. Marthaler A. Bertozzi R.M. Murray Department of Electrical Engineering Vision Laboratory University of California Los Angeles Los Angeles CA USA Department of Physics Duke University Durham NC USA Department of Computer Science Vision Laboratory University of California Los Angeles Los Angeles CA USA Department of Electrical Engineering California Institute of Technology Pasadena CA USA Control and Dynamical Systems California Institute of Technology Pasadena CA USA Department of Mathematics Vision Laboratory University of California Los Angeles Los Angeles CA USA

We consider a motion planning method based on cooperative biological swarming models with virtual attractive and repulsive potentials (VARP). We derive a map between the model and fan speeds for the Kelly, a second order vehicle on the Caltech multi vehicle wireless testbed. The motion planning map results leads to the development and implementation of a point to point controller which is subsequently used as part of a cooperative searching algorithm. The VARP control method is scalable and can be used to organize a swarm of robotic vehicles.

关键词： Vehicle dynamics Motion control Biological system modeling Testing Open loop systems Motion planning Robot kinematics Remotely operated vehicles Equations Propulsion

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