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Control of Halo-Chaos in Beam Transport Network via Neural Network Adaptation with Time-Delayed Feedback

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Communications in Theoretical Physics 2006年第1期45卷 117-120页

作者： FANG Jin-Qing luo xiao-shu Guo-Xian China institute of Atomic Energy P.O. Box 275-27 Beijing 102413 China Department of Physics and Electronic Science Guangxi Normal University Guilin 541004 China

Subject of the halo-chaos control in beam transport networks （channels） has become a key concerned issue for many important applications of high-current proton beam since 1990＇. In this paper, the magnetic field adaptive control based on the neural network with time-delayed feedback is proposed for suppressing beam halo-chaos in the beam transport network with periodic focusing channels. The envelope radius of high-current proton beam is controlled to reach the matched beam radius by suitably selecting the control structure and parameter of the neural network, adjusting the delayed-time and control coefficient of the neural network.

关键词： beam transport network periodic focusing channels high-current proton beam halo-chaos neural network adaptation control time-delayed feedback

Noise-Induced Voltage Collapse in Power Systems

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Chinese Physics Letters 2012年第3期29卷 44-47页

作者： WEI Du-Qu luo xiao-shu ZHANG Bo College of Electronic Engineering Guangxi Normal UniversityGuilin 541004 College of Electric Power South China University of TechnologyGuangzhou 510640

We investigate numerically the influences of Gaussian white noise on the dynamical behaviors of power *** studied model is a three-bus system at some specific parameters,and it demonstrates a stable regime that is far from *** is found that with the increasing noise intensityσ,power systems become unstable and fall into oscillations;asσis further increased,noise-induced voltage collapse in power systems takes *** results confirm that the presence of noise has a detrimental effect on power system ***,the possible mechanism behind the action of noise is addressed based on a dynamical approach where the bifurcation of the system is *** results may provide useful information for avoiding instability problems in power systems.

关键词： system systems unstable

Coupling Strength and System Size Induce Firing Activity of Globally Coupled Neural Network

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Communications in Theoretical Physics 2008年第7期50卷 267-270页

作者： WEI Du-Qu luo xiao-shu ZOU Yan-Li College of Physics and Electronic Engineering Guangxi Normal University Guilin 541004 China

We investigate how firing activity of globally coupled neural network depends on the coupling strength C and system size N. Network elements are described by space-clamped FitzHugh- Nagumo （SCFHN） neurons with the values of parameters at which no firing activity occurs. It is found that for a given appropriate coupling strength, there is an intermediate range of system size where the firing activity of globally coupled SCFHN neural network is induced and enhanced. On the other hand, for a given intermediate system size level, there exists an optimal value of coupling strength such that the intensity of firing activity reaches its maximum. These phenomena imply that the coupling strength and system size play a vital role in firing activity of neural network.

关键词： firing activity space-clamped FitzHugh-Nagumo neuron coupling strength system size

Study Under AC Stimulation on Excitement Properties of Weighted Small-World Biological Neural Networks with Side-Restrain Mechanism

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Communications in Theoretical Physics 2007年第2期47卷 369-373页

作者： YUAN Wu-Jie luo xiao-shu JIANG Pin-Qun College of Physics and Electronic Engineering Guangxi Normal University Guilin 541004 China Department of Physics Huaibei Coal Industry Teachers College Huaibei 235000 China

In this paper, we propose a new model of weighted small-world biological neural networks based on biophysical Hodgkin-Huxley neurons with side-restrain mechanism. Then we study excitement properties of the model under alternating current （AC） stimulation. The study shows that the excitement properties in the networks are preferably consistent with the behavior properties of a brain nervous system under different AC stimuli, such as refractory period and the brain neural excitement response induced by different intensities of noise and coupling. The results of the study have reference worthiness for the brain nerve electrophysiology and epistemological science.

关键词： small-world networks biological neural networks side-restrain mechanism Hodgkin-Huxley equations

Random Long-Range Interaction Induced Synchronization in Coupled Networks of Inertial Ratchets

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Chinese Physics Letters 2011年第11期28卷 28-30页

作者： WEI Du-Qu luo xiao-shu CHEN Hong-Bin ZHANG Bo College of Electronic Engineering Guangxi Normal UniversityGuilin 541004 College of Engineering and Information Science Huaqiao UniversityXiamen 361021 College of Electric Power South China University of TechnologyGuangzhou 510640

We investigate how the random long-range interactions affect the synchronization features in networks of inertial ratchets,where each ratchet is driven by a periodic time-dependent external force,under the influence of an asymmetric periodic *** is found that for a given coupling strength𝐶,the synchronization of the coupled ratchets is induced as the fraction of random long-range interactions𝑝increases and the ratchet networks reach full synchronization for a larger𝑝.It is also found that the system reaches synchronization more effectively for a stronger coupling strength.

关键词： potential strength coupling

Nonlinear dynamics in Internet congestion control model with TCP Westwood under RED

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The Journal of China Universities of Posts and Telecommunications 2009年第4期16卷 53-58页

作者： DING Da-wei ZHU Jie luo xiao-shu HUANG Lin-sheng HU Yan-jun Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei 230039 China Department of Electronic Engineering Shanghai Jiaotong University Shanghai 200240 China School of Electronic Engineering Guangxi Normal University Guilin 541004 China

This article develops a discrete time dynamic feedback model of a congestion control system for a simple network with TCP Westwood （TCPW） connections and a single bottleneck link with random early detection （RED） gateway. By using this model, the nonlinear dynamics of the TCPW/RED network are analyzed and its parameter sensitivities are studied. It is shown that periodic doubling bifurcation occurs when the RED control parameters or other parameters are varied. By theoretical analysis, the fixed point, the critical value of parameters and the nature of the bifurcation are determined. Moreover, by using bifurcation diagrams and Lyapunov exponent, the result of theoretical analysis is validated and the bifurcation and chaotic phenomena are numerically studied of the congestion control system with TCPW connections and RED gateway.

关键词： nonlinear system bifurcation chaos congestion control TCP Westwood RED

Controlling Beam Halo-Chaos

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Chinese Physics Letters 2001年第12期18卷 1554-1557页

作者： FANG Jin-Qing luo xiao-shu CHEN Guan-Rong WENG Jia-Qiang China Institute of Atomic Energy P.O.Box 275-27Beijing 102413 Department of Physics and Electronic Science Guangxi Normal UniversityGuilin 541004 Department of Electronic Engineering City University of Hong KongHong Kong

Beam halo-chaos is essentially a complex spatiotemporal chaotic motion in a periodic-focusing channel of a highpower linear proton accelerator. The controllability condition for beam halo-chaos is analysed qualitatively. A special nonlinear control method, i.e. the wavelet-based function feedback, is proposed for controlling beam halochaos. Particle-in-cell simulations are used to explore the nature of halo-chaos formation, which has shown that the beam hMo-chaos is suppressed effectively after using nonlinear control for the proton beam with an initial full Gaussian distribution. The halo intensity factor Hav is reduced from 14%o to zero, and the other statistical physical quantities of beam halo-chaos are more than doubly reduced. The potential applications of such nonlinear control in experiments are briefly pointed out.

关键词： beam chaos nonlinear

Cooperation in the Mixed Population Minority Game with Imitation

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Chinese Physics Letters 2001年第9期18卷 1156-1158页

作者： QUAN Hong-Jun WANG Bing-Hong HUI Pak-Ming luo xiao-shu Department of Modern Physics and Center of Nonlinear Sciences University of Science and Technology of ChinaHefei 230026 Department of Physics Shaoguan UniversityShaoguan 512005 Department of Physics Chinese University of Hong KongShatinNew TerritoriesHong Kong

After studying the effects of imitation on the mixed population of adaptive agents with different memories competing in a minority game, we have found that when the pure population lies in a crowded regime, the introd... 详细信息

关键词： Population money regime

Control of Beam Halo-Chaos by Fraction Power-Law Function in Hackle Periodic-Focusing Channel

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Communications in Theoretical Physics 2008年第12期50卷 1365-1368页

作者： YU Hai-Jun BAI Long WENG Jia-Qiang luo xiao-shu FANG Jin-Qing Department of Physics Huainan Normal University Huainan 232001 China College of Science China Unversity of Mining and Technology Xuzhou 221008 China College of Physics and Information Technology Guangxi Normal University Guilin 541004 China China Institute of Atomic Energy Beijing 102413 China

The Kapchinsky Vladimirsky(K-V)beam through a hackle periodic-focusing magnetic field is studiedusing the particle-core *** beam halo-chaos is found,and an idea of fraction power-law function controller isproposed based on the mechanism of halo formation and the strategy of controlling *** method is appliedto the multi-particle simulation to control the *** numerical results show that the halo-chaos and its regenerationcan be eliminated effectively by using the fraction power-law function control *** the same time,the radialparticle density is uniform at the beam's center as long as the control method and appropriate parameter are chosen.

关键词： beam halo-chaos hackle periodic-focusing magnetic field fraction power-law function