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第十届全国钙信号和细胞功能研讨会

作者： Pan-Pan Hou Feng Xiao Hao-Wen Liu Ming Yuchi Guo-Hui Zhang Ying Wu Wei Wang Wen-Ping Zeng Ming-Yue Ding Zheng-Xing Wu Jian-Ming Cui Jiu-Ping Ding Key Laboratory of Molecular Biophysics Huazhong University of Science and TechnologyMinistry of EducationCollege of Life Science and Technology Key Laboratory of Image Processing and Intelligent Control Huazhong University of Science and TechnologyMinistry of EducationDepartment of Biomedical EngineeringCollege of Life Science and Technology Department of Biomedical Engineering Center for the Investigation of Membrane Excitability DisordersCardiac Bioelectricity and Arrhythmia CenterWashington University Department of pharmacology Soochow University college of pharmaceutical Sciences

Large-conductance calcium-activated K+(BK-type,mSlo1 or mutations)channels,abundantly distributed in the excitable cells,response to the intracellular Ca2+signal to regulate membrane ***,all the kinetic properties of BK were acquired under circumstance of uniform Ca2+.It is extremely important to explore dynamic sensitivities of BK channels under variety of rapid Ca2+-release or calcium *** photolysis provides the most rapid Ca2+-

关键词： Dynamic Ca sensitivity of BK channels

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Hopf bifurcation of a predator-prey system with predator harvesting and two delays

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NONLINEAR DYNAMICS 2013年第4期73卷 2119-2131页

作者： Zhang, Guodong Shen, Yi Chen, Boshan Huazhong Univ Sci & Technol Dept Control Sci & Engn Wuhan 430074 Peoples R China Educ Minist China Key Lab Image Proc & Intelligent Control Wuhan 430074 Peoples R China Hubei Normal Univ Coll Math & Stat Huangshi 435002 Peoples R China

In this paper, we consider the differential-algebraic predator-prey model with predator harvesting and two delays. By using the new normal form of differential-algebraic systems, center manifold theorem and bifurcation theory, we analyze the stability and the Hopf bifurcation of the proposed system. In addition, the new effective analytical method enriches the toolbox for the qualitative analysis of the delayed differential-algebraic systems. Finally, numerical simulations are given to show the consistency with theoretical analysis obtained here.

关键词： Stability Hopf bifurcation Periodic solutions Time delay Biological system

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Observer-based H∞ control of discrete Markovian jump delay systems with random packet losses and multiplicative noises

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OPTIMAL control APPLICATIONS & METHODS 2013年第6期34卷 728-741页

作者： Wen, Shiping Zeng, Zhigang Huang, Tingwen Bao, Gang Huazhong Univ Sci & Technol Dept Control Sci & Engn Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Key Lab Image Proc & Intelligent Control Educ Minist China Wuhan 430074 Peoples R China Texas A&M Univ Doha 5285 Qatar

This paper investigates the observer-based H control problem for a class of mixed-delay Markovian jump systems with random communication packet losses and multiplicative noises. The mixed delays comprise both discrete time-varying delays and distributed delays, the random packet losses are described by a Bernoulli distributed white sequence that obeys a conditional probability distribution, and the multiplicative disturbances are in the form of a scalar Gaussian white noise with unit variance. In the presence of mixed delays, random packet losses and multiplicative noises, sufficient conditions for the existence of an observer-based feedback controller are derived such that the closed-loop control system is asymptotically mean-square stable and preserves a guaranteed H performance. Then, a linear matrix inequality approach for designing such an observer-based H controller is presented. Finally, a numerical example is provided to illustrate the effectiveness of the developed theoretical results. Copyright (c) 2012 John Wiley & Sons, Ltd.

关键词： observer-based H control random packet loss multiplicative noise

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Passivity analysis of delayed neural networks with discontinuous activations via differential inclusions

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NONLINEAR DYNAMICS 2013年第1-2期74卷 213-225页

作者： Xiao, Jian Zeng, Zhigang Shen, Wenwen Wu, Ailong Huazhong Univ Sci & Technol Dept Control Sci & Engn Wuhan 430074 Peoples R China Educ Minist China Key Lab Image Proc & Intelligent Control Wuhan 430074 Peoples R China Hubei Normal Univ Coll Math & Stat Huangshi 435002 Peoples R China

Without assuming the boundedness and monotonicity of neuron activations, we investigate passivity of delayed neural networks with discontinuous activations. Based on differential inclusion theory, sufficient conditions are established in form of linear matrix inequality by employing the generalized Lyapunov approach. In addition, a kind of control input is designed to stabilize neural network with activation functions having special form. Finally, some numerical examples are proposed to show the effectiveness of developed results.

关键词： Neural networks Discontinuous activation Passivity Differential inclusion

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controllability of Second-Order Multiagent Systems with Multiple Leaders and General Dynamics

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MATHEMATICAL PROBLEMS IN ENGINEERING 2013年第1期2013卷

作者： Liu, Bo Feng, Hongke Wang, Li Li, Rong Yu, Junyan Su, Housheng Xie, Guangming North China Univ Technol Coll Sci Beijing 100144 Peoples R China North China Univ Technol Beijing Key Lab Urban Intelligent Traff Control T Beijing 100144 Peoples R China Shanghai Finance Univ Dept Appl Math Sci Shanghai 201209 Peoples R China Univ Elect Sci & Technol China Coll Math Sci Chengdu 611731 Peoples R China Huazhong Univ Sci & Technol Dept Control Sci & Engn Key Lab Image Proc & Intelligent Control Educ Minist China Wuhan 430074 Peoples R China Peking Univ Coll Engn Dept Ind Engn & Management Intelligent Control LabCtr Syst & Control Beijing 100871 Peoples R China

This paper proposes a new second-order discrete-time multiagent model and addresses the controllability of second-order multiagent system with multiple leaders and general dynamics. The leaders play an important role in governing the other member agents to achieve any desired configuration. Some sufficient and necessary conditions are given for the controllability of the second-order multiagent system. Moreover, the speed controllability of the second-order multiagent system with general dynamics is discussed. Particularly, it is shown that the controllability of the whole system relies on the number of leaders and the connectivity between the leaders and the members. Numerical examples illustrate the theoretical results.

关键词： controllability

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H∞ Synchronization of Directed Complex Dynamical Networks with Mixed Time-Delays and Switching Structures

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CIRCUITS SYSTEMS AND SIGNAL processing 2013年第4期32卷 1575-1593页

作者： Wang, Guan Yin, Quan Shen, Yi Jiang, Feng Huazhong Univ Sci & Technol Dept Control Sci & Engn Wuhan 430074 Hubei Peoples R China Minist Educ Image Proc & Intelligent Control Key Lab Wuhan 430074 Hubei Peoples R China Zhongnan Univ Econ & Law Sch Math & Stat Wuhan 430073 Hubei Peoples R China

This paper is concerned with the H (a) synchronization problem of directed complex dynamical networks. For the system under study, mixed time-delays and stochastic factors are taken into consideration. By stochastic analysis techniques, we establish sufficient conditions under which the network is synchronized to the prescribed system in the H (a) sense. Moreover, the effect of exogenous disturbance on synchronization performance is reduced to a given H (a) norm. Finally, numerical simulations are given to verify the usefulness and effectiveness of our results.

关键词： H-infinity synchronization Directed complex dynamical networks Stochastic perturbations Markovian switching Mixed time-delays

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Observer-Based H∞ Synchronization and Unknown Input Recovery for a Class of Digital Nonlinear Systems

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CIRCUITS SYSTEMS AND SIGNAL processing 2013年第6期32卷 2867-2881页

作者： Zhang, Wei Su, Housheng Zhu, Fanglai Wang, Miaomiao Shanghai Univ Engn Sci Lab Intelligent Control & Robot Shanghai 201620 Peoples R China Huazhong Univ Sci & Technol Sch Automat Key Lab Image Proc & Intelligent Control Minist Educ China Wuhan 430074 Peoples R China Tongji Univ Coll Elect & Informat Engn Shanghai 200092 Peoples R China Huazhong Univ Sci & Technol Sch Automat Wuhan 430074 Peoples R China

This paper considers the synchronization and unknown input recovery problem for a class of digital nonlinear systems based on a nonlinear observer approach. A generalized Luenberger-like observer is introduced for a class of discrete-time Lipschitz nonlinear systems. Stability conditions for the existence of asymptotic observers are established in terms of some linear matrix inequalities. It is shown that the proposed conditions are less conservative than some existing ones in the recent literature. Moreover, an observer design method is used to address the problem of H (a) synchronization and unknown input recovery for a class of Lipschitz nonlinear systems in the presence of disturbances in both the state and output equations. Finally, a numerical example is provided to illustrate the effectiveness of the proposed design.

关键词： Nonlinear observer design Discrete-time systems Lipschitz nonlinear systems H-infinity synchronization Unknown input estimation

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Flocking of multiple autonomous agents with preserved network connectivity and heterogeneous nonlinear dynamics

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NEUROCOMPUTING 2013年 115卷 169-177页

作者： Wang, Miaomiao Su, Housheng Zhao, Miaomiao Chen, Michael Z. Q. Wang, Hongwei Huazhong Univ Sci & Technol Key Lab Educ Minist Image Proc & Intelligent Cont Dept Control Sci & Engn Wuhan 430074 Peoples R China Univ Hong Kong Dept Mech Engn Hong Kong Hong Kong Peoples R China

This paper investigates a flocking problem of multiple agents with heterogeneous nonlinear dynamics. In order to avoid fragmentation, we construct a potential function and a connectivity-preserving flocking algorithm to enable the multiple agents to move with the same velocity while preserving the connectivity of underlying networks with a mild assumption that the initial network is connected and the coupling strength of the initial network of the nonlinear velocity consensus term is larger than a threshold value. Furthermore the proposed flocking algorithm is extended to solve the problem of multi-agent systems with a nonlinear dynamical virtual leader. The result is that all agents' velocities asymptotically approach to the velocity of the virtual leader, and the distance between any two agents is asymptotically stabilized to avoid collisions among agents. Finally, some numerical simulations are presented to illustrate the effectiveness of the theoretical results. (C) 2013 Elsevier B.V. All rights reserved.

关键词： Flocking Connectivity-preserving Heterogeneous Nonlinear dynamics Multi-agent system

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Changes in spectrum mapping in rhythmic movement involved in walking after spinal cord injury

Changes in spectrum mapping in rhythmic movement involved in...

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2013 IEEE International Conference on Medical Imaging Physics and Engineering, ICMIPE 2013

作者： Wei, Li Zhiqiao, Yan Yue, Huang Jiang, Xu Image Processing and Intelligent Control Key Laboratory Education Ministry of China China School of Automation Huazhong University of Science and Technology Wuhan 430074 China Rehabilitation Department Tongji Hospital Wuhan 430074 China

ISBN: (纸本)9781467360128

Spectrum mapping reflects the strength of brain electrical activity in different frequency band. The current study analyzes changes in electroencephalography (EEG) after spinal cord injury (SCI) on the basis of spectrum mapping. Comparing spectrum mappings of SCI patients and normal subjects, the fact that beta rhythm dominated in brain electrical activity during walking period was concluded. In addition, the proportion of delta wave increased and slightly exceeded that of beta wave after spinal cord injury and power values in delta band of SCI patients performed greater than that of normal subjects. © 2013 IEEE.

关键词： Electroencephalography

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Medical image fusion based on Spiking Cortical Model

Medical image fusion based on Spiking Cortical Model

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9th Conference on Digital Pathology at the SPIE Medical Imaging Symposium

作者： Wang, Rui Wu, Yi Ding, Mingyue Zhang, Xuming Huazhong Univ Sci & Technol Sch Life Sci & Technol Key Lab Image Proc & Intelligent Control Dept Biomed EngnMinist Educ Wuhan 430074 Peoples R China

ISBN: (纸本)9780819494504

Medical image fusion plays an important role in clinical applications such as image-guided surgery, image-guided radiotherapy, non-invasive diagnosis, and treatment planning. Although numerous researches have been done in developing various medical image fusion algorithms, the disadvantage of these approaches is that they lack universality in dealing with different kinds of medical images. To address this problem, we have proposed a novel method of medical image fusion using the spiking cortical model (SCM) for the first time. In the paper, the mathematical model of SCM is firstly described, and then image fusion algorithm with SCM is introduced in detail. To show that the SCM based fusion method can deal with multimodal medical images, we have used three pairs of medical images with different modalities in the simulation experiments and made comparisons among the proposed method and the state-of-art fusion methods such as Laplacian pyramid, Contrast pyramid, Morphological pyramid and Ratio pyramid. The performance of various methods is investigated using such image assessment metrics as Mutual Information (MI), the edge preservation values (Q(AB/F)), the Local Structural Similarity (LSSIM) and the Universal image Quality Index (UIQI). The experimental results show that our proposed method outperforms other methods in both visual effect and objective evaluation. It demonstrates that the SCM based method is a highly effective method for multi-modal medical image fusion due to its versatility and stability.

关键词： Spiking Cortical Model Medical image fusion image processing

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