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第三十二届中国控制会议

作者： Song Wenjun Hong Yiguang Hu Xiaoming Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences Optimization and Systems Theory Royal Institute of Technology

ISBN: (纸本)9781479900305

This paper formulates and investigates the relative attitude formation problem of a group of rigid-body agents with directed and switching sensing topologies. Each agent can only measure the attitudes of its neighbors from the body-fixed frame of the agent. Based on the axis-angle representation of the error attitude, we present a distributed protocol and then show how to achieve the desired relative attitude formation, provided that the inter-agent topology graph is jointly connected and each relative attitude between agents initially is contained within a geodesic ball of radius less than 2π/3 centered at its desired relative attitude. A numerical example is provided to show the effectiveness of the proposed angular velocity control scheme.

关键词： Attitude formation, Axis-angle representation, Multi-agent systems, Joint connectivity

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Synchronization in complex networks and its application - A survey of recent advances and challenges

Synchronization in complex networks and its application - A ...

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作者： Tang, Yang Qian, Feng Gao, Huijun Kurths, Jürgen Potsdam Institute for Climate Impact Research Potsdam14473 Germany Institute of Physics Humboldt University of Berlin Berlin12489 Germany Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education East China University of Science and Technology Shanghai200237 China Research Institute of Intelligent Control and Systems Harbin Institute of Technology Harbin150080 China Institute for Complex Systems and Mathematical Biology University of Aberdeen AberdeenAB24 3UE United Kingdom Department of Control Theory Nizhny Novgorod State University Gagarin Avenue 23 Nizhny Novgorod606950 Russia King Abdulaziz University Jeddah21589 Saudi Arabia

Complex networks have, in recent years, brought many innovative impacts to large-scale systems. However, great challenges also come forth due to distinct complex situations and imperative requirements in human life nowadays. This paper attempts to present an overview of recent progress of synchronization of complex dynamical networks and its applications. We focus on robustness of synchronization, controllability and observability of complex networks and synchronization of multiplex networks. Then, we review several applications of synchronization in complex networks, especially in neuroscience and power grids. The present limitations are summarized and future trends are explored and tentatively highlighted. © 2014 Elsevier Ltd. All rights reserved.

关键词： Synchronization

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BSG-starcraft radius improvements of particle swarm optimization algorithm: An application to ceramic matrix composites

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8472卷 166-174页

作者： Chamoret, Dominique Salmon, SáEbastien Cesare, Noelie Di Xu, Yingjie J IRTES-M3M-EA7274 Universitée de Technologie de Belfort Montbáeliard Belfort France Optimization Command and Control Systems Besançcon France Engineering Simulation and Aerospace Computing Key Laboratory of Contemporary Design and Integrated Manufacturing Technology Northwestern Polytechnical University Xi’an710072 China

The thermal residual stresses (TRS) induced in ceramic matrix composites (CMCs) with multi-layered interphases when cooling down from the processing temperature, have a significant influence on the mechanical behavior and lifetime of CMCs. The objective of this work is to minimize the TRS of the unidirectional CMCs with multilayered interphases by controlling the interphases thicknesses. A new Particle Swarm optimization (PSO) algorithm is interfaced with a finite element code to find an optimal design and thereby significantly reduce the TRS within CMCs. This new PSO allows a faster convergence rate and gets a new effective stopping criteria based on real physical limits. © 2014 Springer International Publishing Switzerland. All Rights Reserved.

关键词： Finite element method

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Synchronization of Kuramoto Oscillators with Non-identical Natural Frequencies: a Quantum Dynamical Decoupling Approach

Synchronization of Kuramoto Oscillators with Non-identical N...

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IEEE Annual Conference on Decision and control

作者： Zhifei Zhang Alain Sarlette Zhihao Ling SYSTeMS research group Faculty of Engineering and Architecture Ghent University Technologiepark Zwijnaarde 914 9052 Zwijnaarde(Ghent) Belgium Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education East China University of Science and Technology No.130 Meilong Road Shanghai 200237 China

ISBN: (纸本)9781467360890

This paper proposes a method to counter the drift associated to unknown non-identical natural frequencies in the Kuramoto model of coupled oscillators. Inspired by the quantum dynamical decoupling technique, it builds on a time-varying variant of the dynamics to effectively bring the oscillator phases closer to the same value. This allows effective synchronization despite arbitrarily large differences in natural frequencies. For two agents admitting instantaneous position exchanges, we exactly compute how the relative phase converges to a stable periodic fixed point. The latter tends to zero when the dynamics switches at a faster rate. With continuous state evolutions, using a related dynamic controller instead of instantaneous jumps, we show with a Lyapunov function that exact phase synchronization is obtained. We generalize the method to multiple oscillators with instantaneous state exchanges, that can be implemented by cycling through a predefined or random sequence of exchanges. Simulation results illustrate the effectiveness of the algorithms.

关键词： Natural frequencies Oscillators DECOUPLING phase synchronization coupled oscillators dynamics quanta

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Advanced variable window stereo matching algorithm

Advanced variable window stereo matching algorithm

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4th International Conference on Intelligence Science and Big Data Engineering, IScIDE 2013

作者： Guo, Longyuan Sun, Changyin Zhang, Guoyun Wu, Jianhui Hunan Institute of Science and Technology Key Laboratory of Optimization and Control for Complex Systems College of Hunan Province Yueyang 414006 China School of Automation Southeast University Nanjing 210096 China

ISBN: (纸本)9783642420566

Variable window stereo matching methods overcome the disadvantages of fixed window methods. Using this base idea, an advanced Variable window stereo matching method is proposed. The method takes a certain threshold to determine matching windows. In order to improve the accuracy of matching further, a cost function using the non-parametric and gray value is proposed. The experimental results show that this method can generates more accurate disparity map. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Cost functions

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Denoising and rhythms extraction of EEG under +Gz acceleration based on wavelet packet transform

Denoising and rhythms extraction of EEG under +Gz accelerati...

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2013 7th ICME International Conference on Complex Medical Engineering, CME 2013

作者： Li, Yifeng Zhang, Tao Deng, Lue Wang, Bei Nakamura, Masatoshi Department of Automation Tsinghua University Beijing 100084 China Key Laboratory of Advanced Control and Optimization for Chemical Processes Shanghai 200237 China Air Force Institute of Aeromedicine Beijing 100142 China Research Institute of Systems Control Saga University Saga 840-0047 Japan

ISBN: (纸本)9781467329699

Filtering and feature extraction are very important in the analysis and study of EEG signal under +Gz acceleration. In this study, a new filter of different frequency characteristics of EEG signal under +Gz acceleration is constructed and four kinds of rhythms of EEG signal are extracted by using wavelet packet transformation. EEG under different G loads is analyzed and compared, and then EEG dynamic characteristics are studied in order to analyze its advantages and disadvantages. Experimental results show that wavelet packet method can effectively suppress interference bands in EEG, such as EMG, power and so on, and effectively reflect the dynamic characteristics of different rhythms, exhibiting good characteristics. The proposed method is also applicable for analyzing and studying other dynamic biomedical signals. © 2013 IEEE.

关键词： Extraction

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Variable window stereo matching based on phase congruency

Variable window stereo matching based on phase congruency

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2013 International Conference on Vehicle and Mechanical Engineering and Information Technology, VMEIT 2013

作者： Guo, Long Yuan Sun, Chang Yin Zhang, Guo Yun Wu, Jian Hui College of Information and Communication Hunan Institute of Science and Technology Yueyang 414006 China School of Automation Southeast University Nanjing 210096 China Key Laboratory of Optimization and Control for Complex Systems College of Hunan Province Yueyang 414006 China

ISBN: (纸本)9783037858202

The major challenge in area stereo matching algorithms is to find appropriate window size and shape. Phase congruency is robust to noise and can reflects the gray changes. With these benefits, the paper first detects image and determines pixels characteristics according to phase congruency. Then, different window will be used to matching according to different feature pixels. After using cost function which combined with non-parametric measure and gray value, the final disparity map will be obtained. The result of experiment indicates that the algorithm can generates more accurate disparity map. © (2013) Trans Tech Publications, Switzerland.

关键词： Pixels

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Distributed relative attitude formation control of multiple rigid-body agents with switching topologies

Distributed relative attitude formation control of multiple ...

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Chinese control Conference (CCC)

作者： Wenjun Song Yiguang Hong Xiaoming Hu Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing Beijing CN Optimization and Systems Theory Royal Institute of Technology Stockholm SE

This paper formulates and investigates the relative attitude formation problem of a group of rigid-body agents with directed and switching sensing topologies. Each agent can only measure the attitudes of its neighbors from the body-fixed frame of the agent. Based on the axis-angle representation of the error attitude, we present a distributed protocol and then show how to achieve the desired relative attitude formation, provided that the inter-agent topology graph is jointly connected and each relative attitude between agents initially is contained within a geodesic ball of radius less than 2p/3 centered at its desired relative attitude. A numerical example is provided to show the effectiveness of the proposed angular velocity control scheme.

关键词： Switches Attitude control Vectors Topology Synchronization Closed loop systems Angular velocity

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An image segmentation algorithm based on 3-D maximum between-cluster variance

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Journal of Computational Information systems 2013年第15期9卷 6055-6062页

作者： Qi, Qi He, Wei Zhang, Guoyun Yan, Taishan College of Information and Communication Engineering Hunan Institute of Science and Technology Yueyang 414006 China Key Laboratory of Optimization and Control for Complex Systems College of Hunan Province Yueyang 414006 China

A new method of image segmentation based on 3-D maximum between-cluster variance is proposed. The method uses gray distribution information, neighborhood related information and gradient structure information of pixels to construct 3-D observation space. Based on the complementation, competition and redundancy of all information, this algorithm improves the accuracy of segmentation. By applying the segmentation, predator prey particle swarm optimization (PPPSO) is used to search for the best threshold, which can reduce the searching time, and converge to global optimum rapidly. Theoretical analysis and experiment results show the superior performance of the proposed method in terms of segmentation accuracy, computation efficiency and robustness. © 2013 Binary Information Press.

关键词： Image segmentation

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Automatic Estimation of Sleep Level for Nap Based on Conditional Probability of Sleep Stages and An Exponential Smoothing Method

Automatic Estimation of Sleep Level for Nap Based on Conditi...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： Bei Wang Xingyu Wang Tao Zhang Masatoshi Nakamura Key Laboratory of Advanced Control and Optimization for Chemical Processes (East China University of Science and Technology) Ministry of Education Department of Automation Tsinghua University Research Institute of Systems Control Institute for Advanced Research and Education Saga University

ISBN: (纸本)9781457702150

An automatic sleep level estimation method was developed for monitoring and regulation of day time nap sleep. The recorded nap data is separated into continuous 5-second segments. Features are extracted from EEGs, EOGs and EMG. A parameter of sleep level is defined which is estimated based on the conditional probability of sleep stages. An exponential smoothing method is applied for the estimated sleep level. There were totally 12 healthy subjects, with an averaged age of 22 yeas old, participated into the experimental work. Comparing with sleep stage determination, the presented sleep level estimation method showed better performance for nap sleep interpretation. Real time monitoring and regulation of nap is realizable based on the developed technique.

关键词： Sleep level estimation Sleep stage Conditional probability Nap regulation

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