Yan-Wu Wang

Huazhong University of Science and Technology, Wu-han-shih, Hubei, China

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Publications (43)37.69 Total impact

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    ABSTRACT: This paper presents models for both the continuous-time and discrete-time directed complex dynamical networks (CDNs) with random packet loss, respectively. The packet loss may take place in the communication between every two neighbor nodes. The exponential mean-square stability and the exponential mean-square synchronization for both the continuous-time and discrete-time CDNs with random packet loss are investigated, respectively, by defining the packet loss probability matrix. In addition, two special cases, the CDN with synchronous packet loss and the CDN with node-dependent packet loss, are discussed. Numerical examples are provided for illustrations. Copyright © 2012 John Wiley & Sons, Ltd.
    International Journal of Circuit Theory and Applications 12/2013; 41(12). · 1.29 Impact Factor
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    ABSTRACT: This paper studies the synchronization problem of complex dynamical networks with stochastic delay which switches stochastically among several forms of time-varying delays. Both the discrete and distributed delays are considered, as well as the Markovian jump parameters. The occurrence probability distribution of the stochastic delay is assumed to be known in prior. By utilizing the Lyapunov–Krasovskii stability theory and stochastic analysis techniques, some sufficient exponential synchronization criteria are obtained, which depend not only on the size of delays, but also on the occurrence probability distribution of the stochastic delay. Moreover, the main results are successfully extended to multi-agent systems with stochastic delay. Several numerical examples are given to illustrate the feasibility and effectiveness of the proposed methods.
    Communications in Nonlinear Science and Numerical Simulation 05/2013; 18(5):1175–1192. · 2.77 Impact Factor
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    ABSTRACT: This paper studies the projective synchronization of a drive-response dynamical network of partially linear systems. The coupling-configuration matrix of the network is not necessarily symmetric. Two adaptive pinning control strategies are derived based on the Barbalat’s Lemma. In the first control strategy, the pinning control gain is adaptively updated to realize the projective synchronization. In the second control strategy, both the pinning control gain and the coupling strength between nodes are adaptively updated. Numerical simulation results show that the coupling strength needed in the second control strategy is smaller than that in the first control strategy to achieve the projective synchronization of the network.
    Applied Mathematics and Computation 11/2012; 219(5):2780–2788. · 1.35 Impact Factor
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    ABSTRACT: This paper presents a general model of singular complex switched networks, in which the nodes can be singular dynamic systems and switching behaviors act on both nodes and edges. The parametric uncertainties and unknown coupling topologies are also considered in this model. Two robust synchronization schemes are discussed respectively. In one scheme, the network is synchronized to a homogeneous orbit and in the other one the network is synchronized to a weighted average of all the nodes. Based on the Lyapunov stability theory, different robust synchronization conditions for the two schemes are obtained for this singular complex switched network model via impulsive control. The similarities and differences between these synchronization conditions for the two schemes are discussed. In addition, three useful robust results for the special cases of the singular complex switched networks are presented. Two systematic-design procedures are presented for the two schemes, and three numerical examples are provided for illustrations.
    Communications in Nonlinear Science and Numerical Simulation 11/2012; 17(11):4404–4416. · 2.77 Impact Factor
  • Zhi-Hong Guan, Feng Liu, Juan Li, Yan-Wu Wang
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    ABSTRACT: This paper investigates the chaotification problem of complex dynamical networks (CDN) with impulsive control. Both the discrete and continuous cases are studied. The method is presented to drive all states of every node in CDN to chaos. The proposed impulsive control strategy is effective for both the originally stable and unstable CDN. The upper bound of the impulse intervals for originally stable networks is derived. Finally, the effectiveness of the theoretical results is verified by numerical examples.
    Chaos (Woodbury, N.Y.) 06/2012; 22(2):023137. · 1.80 Impact Factor
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    ABSTRACT: Mean square average consensus for multi-agent systems with measurement noise and time delay under fixed digraph is studied in this article. The time-varying consensus-gain is introduced to attenuate the measurement noise. By combining the tools of algebraic graph theory, matrix theory and stochastic analysis, consensus protocols for multi-agent systems with measurement noise and time delay are elaborately analysed. The example and simulation results are given to illustrate the effectiveness of the obtained theoretical results. Moreover, the simulations demonstrate that, the proper consensus-gain function in the consensus protocol is the necessary and sufficient condition for the convergence of the multi-agent systems.
    International Journal of Systems Science 01/2012; · 1.31 Impact Factor
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    ABSTRACT: A class of complex dynamical networks with stochastic coupling delays is proposed in this paper. The occurrence probability distribution of the stochastic delay is assumed to be known in prior. By utilizing a novel Lyapunov-Krasovskii function and stochastic analysis techniques, a sufficient criterion for the asymptotical synchronization in the mean square is obtained in the form of linear matrix inequalities, and the derived condition depends not only on the delay bounds, but also on the occurrence probability distribution of the delay. Finally, a numerical example is given to illustrate the feasibility and effectiveness of the proposed method.
    Control Conference (CCC), 2012 31st Chinese; 01/2012
  • Tao Bian, Yan-Wu Wang
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    ABSTRACT: In this paper, the average consensus problem of multi-agent systems under logarithm quantized communication is investigated. The logarithm quantizer with finite quantization levels is considered. A sufficient condition is derived to ensure the convergence of the multi-agent system. Finally, a numerical example is given to show the effectiveness of the result obtained in this paper.
    Control Automation Robotics & Vision (ICARCV), 2012 12th International Conference on; 01/2012
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    ABSTRACT: This paper is concerned with the consensus problem of discrete-time multi-agent systems (MASs) over lossy communication channels. The communication connection between agents at initial time is assumed to be accessible, which ensures that the system can reach consensus over ideal communication channels. However, the communication channel can be fading in practice, packet loss occurs inevitably. In this paper by modeling the packet losses as a Markov process with defective transition probabilities, a new description of the scenario of packet losses is addressed. Since the transition probabilities considered here comprise three types: known, uncertain within given intervals, and unknown, our model is more general and practical than previous results. A distributed protocol is introduced to achieve dynamic consensus. Sufficient condition for the mean-square consensus of discrete-time MASs is derived in the form of linear matrix inequalities. Numerical example is also given to illustrate the effectiveness of the theoretical results.
    Control Automation Robotics & Vision (ICARCV), 2012 12th International Conference on; 01/2012
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    ABSTRACT: This paper studies the leader-following finite-time consensus problem for the second-order multi-agent networks with fixed and switched topologies. Based on the graph theory, matrix theory, homogeneity with dilation and LaSalle's invariance principle, finite-time consensus protocols are designed by the pinning control technique without assuming that the interaction graph is connected or the leader is globally reachable. Moreover, the control protocol of each agent using local information is presented, and some examples and simulation results are given to illustrate the effectiveness of the obtained theoretical results.
    Circuits and Systems I: Regular Papers, IEEE Transactions on 01/2012; 59(11):2646-2654. · 2.24 Impact Factor
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    ABSTRACT: In this paper, synchronization of continuous dynamical networks with discrete-time communications is studied. Though the dynamical behavior of each node is continuous-time, the communications between every two different nodes are discrete-time, i.e., they are active only at some discrete time instants. Moreover, the communication intervals between every two communication instants can be uncertain and variable. By choosing a piecewise Lyapunov-Krasovskii functional to govern the characteristics of the discrete communication instants and by utilizing a convex combination technique, a synchronization criterion is derived in terms of linear matrix inequalities with an upper bound for the communication intervals obtained. The results extend and improve upon earlier work. Simulation results show the effectiveness of the proposed communication scheme. Some relationships between the allowable upper bound of communication intervals and the coupling strength of the network are illustrated through simulations on a fully connected network, a star-like network, and a nearest neighbor network.
    IEEE Transactions on Neural Networks 12/2011; 22(12):1979-86. · 2.95 Impact Factor
  • Jing-Wen Yi, Yan-Wu Wang, Jiang-Wen Xiao
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    ABSTRACT: I���������������� ���,((( ) , , } , , , n , [ ) , ) , ) , , , ) , , . } , , , , , , , ) , , , ( , , , . t )) ( ) ( ( ) ( , , , , , ) , , , , , . )) ( , ), ( ), ( ( ) ( ) ( ) ( , , , , , , ) , , }, , , , { , . ) , , , [ ! , ; ) , , ( . ( . ) , , , , ) , , , , } , , , ) , , , ( ) , , , ( ] , , , [ , ) , , , " ] , , , ) , , } , , , ) , , , ( ) , , , ( , , , , , , , , # } , , , { , % % & & }, { ] , , , , , [ . % % % % , , , , . ’ ’ ’ ’ ’ ’ ’ ( ) * * * * * * * + , ] , , , } , , , { , . ) ( ] , , , [ ) ( , , ( ) ( ) , ( )) ( , ), ( ), ( ) ( ) ( ) ( ] , , , ) , ) ( , , , , , } , , , ) ( ) ( ) ( , , ( (
    01/2011;
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    ABSTRACT: In this paper, a general switched model of complex network with two types of delays is presented. The complex switched network (CSN) contains switching behaviors on both its nodes and topology configuration. Different from those CSNs studied in the existing literatures, the two switching signals dominating the nodes and topology are desynchronized. The two types of delays are the time-varying system delay in nodes and the time-varying coupling delay between nodes and they have different values. The inherent synchronization properties of the CSN have been studied not subject to any controllers. By defining a piecewise Lyapunov–Krasovskii function and by using the improved free-weighting matrix method, global exponential synchronizations are obtained. Illustrated example is presented to show the effectiveness of the proposed result.
    Neurocomputing. 01/2011; 74:3151-3157.
  • Tao Bian, Yan-Wu Wang, Jiang-Wen Xiao
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    ABSTRACT: In this paper, a stability analysis of a Cohen-Grossberg neural network (CGNN) with both time-varying delays and parametric uncertainties is given by employing Lyapunov-Krasovskii functional, delay partitioning method and free matrix approach. A sufficient condition is derived to ensure the stability of the uncertain CGNN with time-delay. It is noticeable that the theorem derived in this paper does not require the derivative of time-delay, which makes the result more general compared with former works. Besides, the lower bound of time-delay is also considered in this paper, which may lead to a less conservative result.
    01/2011;
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    ABSTRACT: In this paper, the synchronization of complex dynamical networks (CDNs) with system delay and multiple coupling delays is studied via impulsive distributed control. The concept of control topology is introduced to describe the whole controller structure, which consists of some directed connections between nodes. The control topology can be designed either to be the same as the non-delayed coupling topology of the network, or to be independent of the intrinsic network topology. Based on the concept of control topology, an impulsive controller is designed to achieve the exponential synchronization of CDNs, and moreover, the exponential convergence rate can be specified. Illustrated examples have been given to show the effectiveness of the proposed impulsive distributed control strategy.
    Circuits and Systems I: Regular Papers, IEEE Transactions on 09/2010; · 2.24 Impact Factor
  • Yan-Wu Wang, Jiang-Wen Xiao, Hua O. Wang
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    ABSTRACT: Network failure refers to the case that parts or all of the connections in the network become disconnected. In this paper, the global synchronization of complex dynamical networks with network failures is studied based on the framework of switching system. For simplicity, assume that the network becomes totally unavailable when network failures happen and it takes a period of time to fix the network. In order to ensure the global synchronization of CDNs with network failures, the upper bounds of both the unavailability rate of the network and the frequency of network failures are obtained, respectively. Illustrated examples and the simulation results also show the effectiveness of the proposed result. Copyright © 2009 John Wiley & Sons, Ltd.
    International Journal of Robust and Nonlinear Control 08/2010; 20(15):1667 - 1677. · 1.90 Impact Factor
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    ABSTRACT: This paper proposes a general complex dynamical network model with two types of time-varying delays. The model is more general than those in the existing literatures in that it contains nonlinear coupling term which implies that the network topology can be known or unknown. Besides, the two types of delays consist of the system delay at each node and the coupling delay between nodes. Based on the Lyapunov stability theory, an adaptive synchronization criterion is proposed theoretically. An illustrated example is given to show the effectiveness of the theoretical result.
    01/2010;
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    ABSTRACT: In this paper, the synchronization of complex dynamical networks (CDNs) under ‘successful’ but recoverable attacks is studied by utilizing the framework of switching systems. ‘Successful’ attacks refer to a class of attacks that break a network into a group of isolated clusters. Recoverable attacks refer to a class of attacks that the network can recover from after a period of time. To facilitate the investigation of the synchronization of a CDN under ‘successful’ but recoverable attacks, the attack frequency and the average recovering time are introduced. By using a piecewise Lyapunov function, the upper bounds of the attack frequency and the average recovering time are obtained to ensure that the whole network can achieve global synchronization under attacks.
    Automatica. 01/2010; 46:197-203.
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    ABSTRACT: This paper presents a general impulsively-coupled complex switched network (ICCSN) model with parametric uncertainties and multiple Time-varying Delays in both the linear and nonlinear terms. The model is more general than those in the literature in that it contains switching behaviors on nodes and impulsive effects in the whole topology. Robust synchronization of ICCSNs with parametric uncertainties and time-varying delays is investigated. Based on the Lyapunov stability theory, delay-independent synchronization conditions for ICCSNs with uncertainties and delays are obtained. In addition, we consider five special synchronization cases: ICCSNs with delays in both the linear and nonlinear terms, ICCSNs with parametric uncertainties and delays either in the linear or in the nonlinear term, ICCSNs without switching behaviors but with parametric uncertainties and delays, and impulsively-switched-coupled complex switched network with uncertainties and delays. A systematic-design procedure is presented, and a numerical example is carried out to demonstrate the effectiveness of the proposed synchronization strategy. A comparative study of the maximum impulsive intervals for synchronization is presented for all special cases.
    Nonlinear Analysis-real World Applications - NONLINEAR ANAL-REAL WORLD APP. 01/2010; 11(4):3008-3020.
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    ABSTRACT: This paper investigates the adaptive-impulsive synchronization of complex dynamical networks with two types of constant delays. Based on the stability analysis of impulsive control system, sufficient condition for the synchronization is derived and a hybrid controller, namely, an adaptive-feedback controller with impulsive control effects is designed. From another perspective, if the model is considered as a delayed network with pulse interference, then control strategy is only adaptive control. Numerical examples are presented to show the effectiveness of the presented method and the allowed upper bound for the time delays is given for the example.
    01/2010;