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Firth IEEE International Conference on Cognitive Informatics(第五届认知信息国际会议)

作者： Zhihua Cui Jianchao Zeng Guoji Sun State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an. 710049 Division of System Simulation and Computer Application Taiyuan University of Science and Technology State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an. 710049

ISBN: (纸本)1424404754;9781424404759

The standard particle swarm optimization (PSO) may prematurely converge on suboptimal solution partly because of the insufficiency information utilization of the velocity. The time cost by velocity is longer than position of each particle of the swarm, though the velocity, limited by the constant Vmax, onfy provides the positional displacement To avoid premature convergence, a new modified PSO, predicted PSO, is proposed owning two different swarms in which the velocity without limitation, considered as a predictor, is used to explore the search space besides providing the displacement while the position considered as a corrector. The algorithm gives some balance between global and local search capability. The optimization computing of some examples is made to show the new algorithm has better global search capacity and rapid convergence rate.

关键词： Particle swarm optimization Predicted velocity Exploration capability Exploitation capability

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Self-organized criticality and scale-free properties in emergent functional neural networks

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Physical Review E 2006年第4期74卷 045101(R)-045101(R)页

作者： Chang-Woo Shin Seunghwan Kim []Asia Pacific Center for Theoretical Physics National Core Research Center for System Biodynamics and Nonlinear and Complex Systems Laboratory Department of Physics Pohang University of Science and Technology San 31 Hyoja-dong Nam-gu Pohang Gyungbuk Korea 790-784

Recent studies on complex systems have shown that the synchronization of oscillators, including neuronal ones, is faster, stronger, and more efficient in small-world networks than in regular or random networks. We show that the functional structures in the brain can be self-organized to both small-world and scale-free networks by synaptic reorganization via spike timing dependent synaptic plasticity instead of conventional Hebbian learning rules. We show that the balance between the excitatory and the inhibitory synaptic inputs is critical in the formation of the functional structure, which is found to lie in a self-organized critical state.

关键词： SYNAPTIC PLASTICITY complex NETWORKS

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Sporadic feedback control of flow turbulence

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Physical Review E 2006年第5期73卷 056307-056307页

作者： Guoning Tang Gang Hu Department of Physics Beijing Normal University Beijing 100875 China College of Physics and Information Technology Guangxi Normal University Guilin 541004 China Chinese Center for Advanced Science and Technology (World Laboratory) Beijing 8730 China Beijing-Hong Kong-Singapore Joint Center of Nonlinear & Complex Systems (Beijing) Beijing Normal University Beijing 100875 China

In this work we consider the problem of flow turbulence control in a two-dimensional Navier-Stokes equation. We suggest a control strategy which sporadically applies global feedback to a single velocity component of the velocity field. It is found that this control strategy can significantly enhance the control efficiency when the optimal fraction for the control period is suitably chosen, both larger and smaller control time fractions may reduce the control precision. The physical mechanism underlying this interesting and strange behavior is heuristically analyzed, based on mode-mode interactions.

关键词： CONTROLLING SPATIOTEMPORAL CHAOS PARTIAL-DIFFERENTIAL EQUATIONS systems PATTERNS DRAG

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Suppression of Winfree turbulence under weak spatiotemporal perturbation

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Physical Review E 2006年第6期73卷 060901(R)-060901(R)页

作者： Ning-Jie Wu Hong Zhang He-Ping Ying Zhoujian Cao Gang Hu Zhejiang Institute of Modern Physics and Department of Physics Zhejiang University Hangzhou 310027 China Department of Physics and The Beijing-Hong Kong-Singapore Joint Centre for Nonlinear and Complex Systems (Beijing) Beijing Normal University Beijing 100875 China Chinese Center for Advanced Science and Technology (World Laboratory) Beijing 8730 China

Winfree turbulence is a chaotic wave pattern developing through negative-tension instability of scroll wave filaments in three-dimensional weak excitable media. Here, we investigate the response of Winfree turbulence to a spatiotemporal forcing in the form of a traveling-wave modulation of the medium excitability. It is shown that turbulent waves can be suppressed much more rapidly by this method, in comparison with the space-uniform modulation of the medium excitability. Since the occurrence of Winfree turbulence is currently regarded as one of the possible mechanisms underlying cardiac fibrillation, this method turns out to be suggestive of a possible low-amplitude defibrillation approach.

关键词： SPIRAL-WAVE DYNAMICS EXCITABLE MEDIA SCROLL WAVES MUSCLE MODEL

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Self-organization of chaos synchronization and pattern formation in coupled chaotic oscillators

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Physical Review E 2006年第1期74卷 015202(R)-015202(R)页

作者： Xiaoming Zhang Maolin Fu Jinghua Xiao Gang Hu Department of Physics Beijing Normal University Beijing 100875 China School of Mathematics and Physics Nanhua University Hengyang 421001 China School of Science Beijing University of Posts and Telecommunications Beijing 100876 China Chinese Center for Advanced Science and Technology (World Laboratory) Beijing 8730 China Beijing–Hong Kong–Singapore Joint Center of Nonlinear and Complex Systems Beijing Normal University Branch Beijing China

Pattern formation in spatiotemporal chaotic systems is investigated. Temporally chaotic and spatially ordered patterns are observed by varying the coupling strength. Spatial orderings emerge spontaneously due to self-organization of partial and nonlocal chaos synchronization, governed by various types of spatial symmetries. The first and secondary bifurcations from spatially disordered chaos to chaos with different levels of spatial orderings are observed and the scaling behaviors associated with these bifurcations are statistically analyzed.

关键词： SPATIOTEMPORAL CHAOS ELECTROCHEMICAL OSCILLATORS SYNCHRONOUS CHAOS systems POPULATIONS FLUID

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Controlling drift-wave turbulence using time-delay and space-shift autosynchronization feedback

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Physical Review E 2006年第5期73卷 056303-056303页

作者： Guoning Tang Kaifen He Gang Hu Department of Physics Beijing Normal University Beijing 100875 China College of Physics and Information Technology Guangxi Normal University Guilin 541004 China Institute of Low Energy Nuclear Physics Beijing Normal University Beijing 100875 China Chinese Center for Advanced Science and Technology (World Laboratory) Beijing 8730 China Beijing-Hong Kong-Singapore Joint Center of Nonlinear and Complex Systems Beijing Normal University Branch-Beijing China

Drift-wave turbulence control in a one-dimensional nonlinear drift-wave equation driven by a sinusoidal wave is considered. We apply time-delay and space-shift feedback signals, to suppress turbulence. By using global and local pinning strategies, we show numerically that the turbulent state can be controlled to periodic states effectively if appropriate time-delay length and space-shift distance are chosen. The physical mechanism of the control scheme is understood based on the energy-minimum principle.

关键词： CONTROLLING SPATIOTEMPORAL CHAOS TRANSPORT DEVICES PLASMA

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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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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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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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EQUIVALENCE OF REFINED THEORY AND DECOMPOSED THEOREM OF AN ELASTIC PLATE

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Applied Mathematics and Mechanics(English Edition) 2005年第4期26卷 486-494页

作者：赵宝生王敏中 School of Mechanical Engineering and Automation Anshan University of Science and Technology State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering Science Peking University Beijing 100871 P.R.China

A connection between Cheng's refined theory and Gregory's decomposed theorem is analyzed. The equivalence of the refined theory and the decomposed theorem is given. Using operator matrix determinant of partial differential equation, Cheng gained one equation, and he substituted the sum of the general integrals of three differential equations for the solution of the equation. But he did not prove the rationality of substitute. There, a whole proof for the refined theory from Papkovich?_Neuber solution was given. At first expressions were obtained for all the displacements and stress components in term of the mid_plane displacement and its derivatives. Using Lur'e method and the theorem of appendix, the refined theory was given. At last, using basic mathematic method, the equivalence between Cheng's refined theory and Gregory's decomposed theorem was proved, i.e., Cheng's bi_harmonic equation, shear equation and transcendental equation are equivalent to Gregory's interior state, shear state and Papkovich_Fadle state, respectively.

关键词： elastic plate isotropic plate refined theory decomposed theorem Papkovich_Neuber general solution

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