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International Conference on Power System Technology (POWERCON)

作者： Rong-fu Sun Yue Fan Yong-hua Song Yuan-zhang Sun Department of Electrical Engineering Tsinghua University Beijing China Northwest China Grid Company Xi'an Shanxi Province China School of Engineering and Design Brunel University London UK Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing China

In the environment of the power market, available transfer capability (ATC) is a measure of transfer capability remaining in the physical transmission network for future commercial activity over and above already committed uses, then it is an important parameter for all companies participating in the power transmission activities. Widely used ATC calculation software-Powerworld simulates power transfer increment through decreasing generation output in sink area (receiving-end) using the repeated power flow method, but this simulation model does not accord with the actual circumstances of electricity shortage in China. In this paper, a combined method including linear distribution factors and repeated power flow (RPF) is proposed to perform ATC calculation, meanwhile, two scenarios can be selected to simulate power transfer increment: One is to increase the total generation output in source area as the load in sink area increases; The other is to decrease the same amount of generation in sink area while the generation output in source area is to be increased. According to the tests applied in the Northwest China power network to perform ATC calculation and analysis, this method guarantees more exact results by simulating actual transfer increasing mode of the Northwest China power network.

关键词： Application software Power generation Load flow Power markets Power measurement Particle measurements Power transmission Testing Performance evaluation Performance analysis

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An Improved Particle Swarm Optimization and Its Application to Power System Transfer Capability Calculation

An Improved Particle Swarm Optimization and Its Application ...

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International Conference on Power System Technology (POWERCON)

作者： Chang-hua Zhang Rong-fu Sun Chong-xu Liu Yue Fan Shuan-bao Niu Yong-hua Song Key Laboratory of Complex Systems Intelligence Science Institute of Automation Chinese Academy and Sciences Beijing China Department of Electrical Engineering Tsinghua University Beijing China Northwest China Grid Company Limited Xi'an Shanxi China School of Engineering and Design Brunei University London UK

In this paper, an algorithm based on particle swarm optimization (PSO) for power system transfer capability calculation is presented. A dual fitness scheme that takes both objective and constraint into account is adopted to evaluate the survival chance of any particle, thus avoid the drawbacks of traditional penalty method. In the evolution process, if the population best particle has no update during a prescribed number of consecutive generations, it is regarded as a local optimum solution and the searching space around this particle is locked to prevent other particles flying into it. And this particle is saved as one of the candidate solution. In the end, by comparing the fitness of all saved particles and the current population best particle, the optimum value can be obtained. This improved particle swarm algorithm is then successfully applied to IEEE118 bus system optimization problem. Compared with a traditional well-known method, sequential quadratic programming (SQP), our proposal obtains better solutions for this problem.

关键词： Particle swarm optimization Power systems Power system reliability Optimization methods Power generation Power system modeling Sun Load flow Mathematical model Equations

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Real-time and interactive freehand three-dimensional ultrasound imaging system

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Ruan Jian Xue Bao/Journal of Software 2006年第SUPPL.期17卷 28-37页

作者： Dai, Ya-Kang Tian, Jie Xue, Jian Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing 100080 China Graduate School Chinese Academy of Sciences Beijing 100049 China

Conventional freehand three-dimensional (3-D) ultrasound imaging systems cannot achieve real-time and interactive reconstruction. The overall design idea, 3-D reconstruction method, and hardware/software system structure of the developed real-time and interactive freehand 3-D ultrasound imaging system, which is called RIF-3DUSIS, is introduced in this article. The characteristics of RIF-3DUSIS are as follows: (1) acquisition, 3-D reconstruction, and interactive manipulation of the reconstructed volume model in real time during scanning process;(2) While scanning, not only displaying reconstructed volume dynamically to provide visual feedback, but also updating display of reconstructed ratio sequentially to conduct reconstruction plan quantitatively;(3) Showing instruction information before each operation step so as to instruct operator's work. Experimental results indicate the effectiveness of real-time reconstruction and the flexibility of dynamic interaction of RIF-3DUSIS.

关键词： Imaging systems

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Correlation Analysis between TCM Syndromes and Physicochemical Parameters

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Chinese Journal of Biomedical Engineering(English Edition) 2006年第3期15卷 93-102页

作者： SUN Zhan-quan XI Guang-cheng Li Hai-xia YI Jian-qiang WANG jie Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Academy of Sciences Beijing. 100080 China Guanganmen Hospital Chinese Academy of Traditional Chinese Medicine Beijing 100053 China

Traditionally, differentiation of syndromes of Traditional Chinese Medicine (TCM) mainly depends on the information obtained from four diagnosis methods. Now many physicochemical parameters are available in clinic. There exists great correlation between TCM syndromes and physicochemical parameters. The objective of the paper is to analyze the correlation between TCM syndromes and physicochemical parameters quantitatively. Correlation analysis has been widely studied and many analysis methods have been developed. Mutual information based on entropy can measure arbitrary dependence between variables. It has been applied to many kinds of fields, especially to pattern recognition. But most works are restricted to discrete variables and little work has been done to study the relation between discrete and continuous variables. A novel algorithm is proposed to calculate the mutual information between discrete and continuous variables. It is used to analyze the correlation between TCM syndromes and physicochemical parameters.

关键词： Bayesian estimation Correlation Mutual information Entropy

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Structure-Constrained Obstacles Recognition for Power Transmission Line Inspection Robot

Structure-Constrained Obstacles Recognition for Power Transm...

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2006 IEEE/RSJ International Conference on Intelligent Robots and systems

作者： Siyao Fu Weiming Li Yunchu Zhang Zize Liang Zengguang Hou Min Tan Wenbo Ye Bo Lian Qi Zuo Key laboratory of complex systems and intelligence science Institute of Automation Chinese Academy and Sciences Beijing China National laboratory of pattern recognition Institute of Automation Chinese Academy and Sciences Beijing China Faculty of Information and Electrical Engineering Shandong University of Architecture and Engineering Jinan China Zunyi Power Supply Bureau Guizhou Power Grid Corporation Zunyi China Department of Automation North-China University of Technology Beijing China

Inspection robot must plan its behavior to detect the obstacles from the complex background according to their types when it is crawling along the power transmission line in order to negotiate reliably. However, in most instances, detecting the obstacles from the complex background is a hard task. For this purpose, a novel and fast visual obstacle recognition algorithm is designed based on the structure of the 220 KV power transmission line. Basic principle and architecture of the algorithm are given. By this approach, three typical obstacles on the power transmission line such as insulator strings, counterweights and suspension clamps can be recognized with high accuracy. Experiments in the real power transmission line show its effectiveness. This method can contribute to the process of the mobile robot negotiating obstacles

关键词： Power transmission lines Inspection Mobile robots Robotics and automation Sensor arrays Robot sensing systems Intelligent robots Insulation Power system reliability Laboratories

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Special properties of Eshelby tensor for a regular polygonal inclusion

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Acta Mechanica Sinica 2005年第3期21卷 267-271页

作者： Baixiang Xu Minzhong Wang State Key Laboratory for Turbulence and Complex Systems and Department of Mechanics and Engineering Science Beijing 100871 China

When studying the regular polygonal inclusion in 1997, Nozaki and Taya discovered numerically some remarkable properties of Eshelby tensor： Eshelby tensor at the center and the averaged Eshelby tensor over the inclusion domain are equal to that of a circular inclusion and independent of the orientation of the inclusion. Then Kawashita and Nozaki justified the properties mathematically. In the present paper, some other properties of a regular polygonal inclusion are discovered. We find that for an N-fold regular polygonal inclusion except for a square, the arithmetic mean of Eshelby tensors at N rotational symmetrical points in the inclusion is also equal to the Eshelby tensor for a circular inclusion and independent of the orientation of the inclusion. Furthermore, in two corollaries, we point out that Eshelby tensor at the center, the averaged Eshelby tensor over the inclusion domain, and the line integral average of Eshelby tensors along any concentric circle of the inclusion are all identical with the arithmetic mean.

关键词： Eshelby tensor Regular polygonal inclusion Arithmetic mean Center of regular polygon Average

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Development and Research of Intelligent Transportation systems in China's Tenth Five-Year Plan

Development and Research of Intelligent Transportation Syste...

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International Conference on Intelligent Transportation

作者： Shuming Tang Fei-Yue Wang Gang Wang Xingwu Jia Fasheng Liu University of Science and Technology Qingdao China Xi'an Jiaotong University Xi'an China Chinese Academy and Sciences Beijing China Institute of Automation Shandong Academy of Sciences Jinan China Key Laboratory for Complex Systems and Intelligence Science of Institute of Automation Chinese Academy and Sciences Beijing China University of Arizona Tucson Tucson USA Beijing Municipal Committee of Communications Beijing China Traffic Management Department Shandong Public Security Bureau Jinan China Shandong University of Science and Technology Qingdao China

This paper presents a brief summary of the development and research of intelligent transportation systems in the period of China's tenth five-year plan. The developed integrated systems shown in this paper include traffic street intersection signal control, digital bus station, integrated traffic network control and management. The key researched techniques introduced in this paper are focused on agent-based and vision-based technologies; traffic modeling, control, and simulation; communication and location-based services and driving safety and assistance. A proposed strategy of artificial transportation systems will be a potential approach to solve complex traffic problems

关键词： Intelligent transportation systems Communication system traffic control Traffic control Industrial economics Intelligent systems Automation Control systems Intelligent networks Digital control Safety

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Dynamic crack growth in a fiber-reinforced composite plate

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Chinese science Bulletin 2005年第15期50卷 1565-1569页

作者： LIU Kaixin LIU Weifu Zhang dinxiang LI Rong ZHANG Guohua FU Bin State Key Laboratory for Turbulence and Complex Systems and Department of Mechanics and Engineering Science Peking University100871 China

This paper reports an experiment on the failure of a precracked plate made of unidirectional glass-epoxy fi-ber-reinforced composites subjected to three-point bending impact load. In the experiment, the whole process of crack growth was recorded by using high-speed photographic technique, in which a transmitted light path was adopted. Moreover, a new phenomenon of dynamic fracture has been observed. Based on the results, some preliminary studies have been carried out on the rate and path of the crack growth, as well as the failure mode.

关键词：支架桥面光纤加固合成高速摄影动态断裂过程

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The compliance contact model of cylindrical joints with clearances

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Acta Mechanica Sinica 2005年第5期21卷 451-458页

作者： Caishan Liu Ke Zhang Lei Yang Department of Mechanics and Engineering Science State Key Laboratory of Turbulence and Complex SystemsPeking University Beijing 100871 China Chinese Academe of Space Technology Beijing 100086 China

This paper is concerned with the determination of the normal force-displacement （NFD） relation for the contact problem of cylindrical joints with clearance. A simple formulation for this contact problem is developed by modeling the pin as a rigid wedge and the elastic plate as a simple Winkler elastic foundation. The numerical results show that the normal displacement relation based on Hertz theory is only valid for the case of large clearance with a small normal load, and the NFD relation based on Persson theory is only effective in the case of very small clearance. The proposed approximate model in this paper gives better results than Hertz theory and Persson theory in a large range of clearances as seen from the comparison with the results of FEM.

关键词： Cylindrical joint with clearance .Conformalcontact. FEM

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A review of Petri Net based modeling and verification for embedded real-time systems

A review of Petri Net based modeling and verification for em...

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DETC2005: ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference

作者： Zhang, Haitao Wang, Fei-Yue Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing 100080 China Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences China

ISBN: (纸本)0791847411

Petri Nets are widely applied to the modeling of embedded real-time systems. Classical Petri Nets are continuously improved to adapt embedded real-time systems. This paper addresses various extended Petri Nets and their characteristic in the modeling of embedded real-time systems. At last, some methods of the formal modeling and verification using Petri Nets are introduced. Copyright © 2005 by ASME.

关键词： Petri nets

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