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A TISSUE P SYSTEM BASED SOLUTION TO QUADRATIC ASSIGNMENT PROBLEM

INTERNATIONAL JOURNAL OF FOUNDATIONS OF COMPUTER SCIENCE 2012年第7期23卷 1511-1522页

作者： Niu, Yunyun Subramanian, K. G. Venkat, Ibrahim Abdullah, Rosni Huazhong Univ Sci & Technol Dept Control Sci & Engn Key Lab Image Proc & Intelligent Control Wuhan 430074 Peoples R China Univ Sains Malaysia Sch Comp Sci George Town 11800 Malaysia

The quadratic assignment problem (QAP) is one of the fundamental combinatorial optimization problems, which models many real-life problems. However, it is considered as one of the most difficult NP-hard problems, which means that no polynomial-time algorithm is known to solve this intractable problem effectively. Even small instances of QAP may require vast computation time. In this work, a uniform cellular solution to QAP is proposed in the framework of membrane computing by using a family of recognizer tissue P systems with cell division. In the design of the solution, we encode the given instances in binary notations. The paper can be considered as a contribution to the study of considering a binary encoding of the information in P systems.

关键词： Membrane computing Tissue P system cell division quadratic assignment problem

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A Note on Observers for Discrete-Time Lipschitz Nonlinear Systems

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 2012年第2期59卷 123-127页

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

This brief considers observer design for a class of discrete-time nonlinear systems with Lipschitz nonlinearities. We first remark some statements and results in a recent brief by Zemouche and Boutayeb. In particular, we show that their results are more conservative than an existing one, rather than less conservative as claimed. Moreover, most of the existing results are only applicable to some particular classes of Lipschitz systems with a Lipschitz constant less than one. In order to obtain less conservative results, the concept of a one-sided Lipschitz condition, which is an extension of its well-known Lipschitz counterpart, is introduced. Sufficient conditions ensuring the existence of state observers for one-sided Lipschitz nonlinear systems are then presented. A numerical example is included to illustrate the advantages and effectiveness of the proposed design.

关键词： Discrete-time nonlinear systems linear matrix inequality (LMI) Lyapunov stability observer design one-sided Lipschitz condition

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Complex Dynamical Behaviors Analysis of a Voltage-controlled Memristive System

Complex Dynamical Behaviors Analysis of a Voltage-controlled...

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10th World Congress on intelligent control and Automation (WCICA)

作者： Sun, Junwei Shen, Yi Zhang, Guodong Huazhong Univ Sci & Technol Dept Control Sci & Engn Key Lab Minist Educ Image Proc & Intelligent Control Wuhan 430074 Hubei Peoples R China

ISBN: (纸本)9781467313988

The contribution is concerned on structural properties and general features of the new ideal circuit element, a memristor. The previous memristive system is only focused on the voltage versus current curves with increasing frequency.. of the alternating voltage source. The paper extends the notion of the voltage versus current curves, the resistance versus current curves and the voltage versus resistance curves, and those which are influenced by the initial conditions, frequency, voltage, alpha and beta, and input excitation. The paper has emulated by MATlab, more comprehensive and systematic analyzes and obtains a lot of the new characteristics of memristive system and important information.

关键词： Memristive system Input excitation Initial conditions

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A NOVEL VISUAL SERVOING MICROASSEMBLY SYSTEM

A NOVEL VISUAL SERVOING MICROASSEMBLY SYSTEM

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2nd IEEE International Conference on Cloud Computing and intelligent Systems (CCIS)

作者： Huang, Xinhan Mao, Shangqin Wang, Min Huazhong Univ Sci & Technol Dept Control Sci & Engn Key Lab Image Proc & Intelligent Control Minist Educ China Wuhan 430074 Peoples R China

ISBN: (纸本)9781467318556;9781467318570

The focus of this paper is the design and development of an automatic system for microassembly. The automatic processing is made possible by (i) the development of a machine vision algorithm to identify the targets and end-effectors, (ii) an uncalibrated visual servoing algorithm to lead the end-effector to grasp the micro-pieces and then assemble the target. The experimental results demonstrate that this prototype microassembly system is effective and practicable for automatic microassembly applications.

关键词： microassembly target recognition visual servoing

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Reliable H∞ Filter Design for a Class of Mixed-Delay Markovian Jump Systems with Stochastic Nonlinearities and Multiplicative Noises via Delay-Partitioning Method

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INTERNATIONAL JOURNAL OF control AUTOMATION AND SYSTEMS 2012年第4期10卷 711-720页

作者： Wen, Shiping Zeng, Zhigang Huang, Tingwen 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 Texas A&M Univ Doha 5825 Qatar

This paper is concerned with the problem of reliable H-infinity filter design for a class of mixed-delay Markovian jump systems with stochastic nonlinearities and multiplicative noises. The mixed delays comprise both discrete time-varying delay and distributed delay. The stochastic nonlinearities in the form of statistical means cover several well-studied nonlinear functions. And the multiplicative disturbances are in the form of a scalar Gaussian white noise with unit variance. Furthermore, the failures of sensors are quantified by a variable varying in a given interval. A filter is designed to guarantee that the dynamics of the estimation error is asymptotically mean-square stable. Sufficient conditions for the existence of such a filter are obtained by using a new Lyapunov-Krasovskii functional and delay-partitioning method. Then a linear matrix inequality (LMI) approach for designing such a reliable H-infinity filter is presented. Finally, the effectiveness of the proposed approach is demonstrated by a numerical example.

关键词： Delay partitioning H-infinity filter Markovian jump multiplicative noise reliable filtering stochastic nonlinearity

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STABILITY OF IMPULSIVE STOCHASTIC NEUTRAL PARTIAL DIFFERENTIAL EQUATIONS WITH INFINITE DELAYS

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ASIAN JOURNAL OF control 2012年第6期14卷 1706-1709页

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

In this paper, we study the existence and asymptotic stability in the pth moment of the mild solutions to impulsive stochastic neutral partial differential equations with infinite delays. Sufficient conditions ensuring the stability of the impulsive stochastic system are established. The results are obtained via the Banach fixed point theorem.

关键词： Asymptotic stability mild solution impulsive stochastic neutral partial differential equations infinite delay

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Optimal Ascent Guidance based on Direct Optimization Method

Optimal Ascent Guidance based on Direct Optimization Method

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2012 International Conference on Modelling,Identification and control(建模、辨别与控制国际会议 ICMIC 2012)

作者： Xuefang Lu Yongji Wang Candidate of Key Laboratory of Ministry of Education for Image Processing and Intelligent Control Hu Key Laboratory of Ministry of Educationfor Image Processing and Intelligent Control Huazhong Univers

ISBN: (纸本)9781467315241

In this paper, an optimal guidance algorithm is proposed for atmospheric *** optimal guidance algorithm updates the reference trajectory to deal with the impact of disturbance by solving an optimal control problem *** the strong nonlinear ascent dynamic, the optimal control problem is transformed into nonlinear programming problem by trajectory *** direct optimization method is implemented for this nonlinear programming *** a segment of the reference trajectory is updated by the optimal guidance *** to the small amount of the discrete nodes and the initial guess solution which is close to the optimization solution, the direct optimization method is fast enough to generate a new reference *** simulation for the Generic Hypersonic Vehicle model and scramjet engine is done for different cases of the aerodynamic coefficient *** results show the accuracy and the effectiveness of this optimal guidance algorithm.

关键词： Optimal Guidance, Ascent, Direct Optimization

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Adaptive synchronization of memristor-based Chua's circuits

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PHYSICS LETTERS A 2012年第44期376卷 2775-2780页

In this Letter, a memristor-based Chua's system is presented, and the chaotic behavior of this system is demonstrated by phase portraits. This Letter also deals with the problem of adaptive synchronization control of this chaotic system using the drive-response concept, and presents an adaptive control scheme for the synchronization of memristor-based Chua's circuit, when the parameters of the drive system are fully unknown and different with those of the response system. The sufficient condition for the adaptive synchronization has been analyzed. Moreover, the controller design method is further extended to more general cases, where the physical plant contains parameter uncertainties, represented in either polytopic or structured frameworks. Numerical simulations are used to demonstrate these results. (C) 2012 Elsevier B.V. All rights reserved.

关键词： Memristor Chua's circuit Adaptive synchronization

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Robust H∞ output tracking control for fuzzy networked systems with stochastic sampling and multiplicative noise

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NONLINEAR DYNAMICS 2012年第2期70卷 1061-1077页

作者： Wen, Shiping Zeng, Zhigang Huang, Tingwen Huazhong Univ Sci & Technol Dept Control Sci & Engn Wuhan 430074 Peoples R China Control Educ Minist China Key Lab Image Proc & Intelligent Wuhan 430074 Peoples R China Texas A&M Univ Qatar Doha 5825 Qatar

In this paper, the problem of robust sampled-data H (a) output tracking control is investigated for a class of fuzzy networked systems with stochastic sampling, multiplicative noise and time-varying norm-bounded uncertainties. For the sake of technical simplicity, only two different sampling periods are considered, their occurrence probabilities are given constants and satisfy Bernoulli distribution, and they can be extended to the case with multiple stochastic sampling periods. By using an input-delay method, the probabilistic system is transformed into a stochastic continuous time-delay system. A new linear matrix inequality(LMI)-based procedure is proposed for designing state-feedback controllers, which would guarantee that the closed-loop networked system with stochastic sampling tracks the output of a given reference model well in the sense of H (a). Conservatism is reduced by taking the probability into account. Both network-induced delays and packet dropouts have been considered. Finally, an illustrative example is given to show the usefulness and effectiveness of the proposed H (a) output tracking design.

关键词： Output tracking control Stochastic sampling Uncertainty Multiplicative noise

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Exponential stability analysis of memristor-based recurrent neural networks with time-varying delays

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NEUROCOMPUTING 2012年 97卷 233-240页

This paper investigates the exponential stability problem about the memristor-based recurrent neural networks. Having more rich dynamic behaviors, neural networks based on the memristor will play a key role in the optimistic computation and associative memory, therefore, stability analysis of memristor-based neural networks are quite important. Based on the knowledge of memristor and recurrent neural network, the model of the memristor-based recurrent neural networks is established;and the stability of memristor-based neural networks with time-varying delays is studied. Several sufficient conditions for the global exponential stability of these neural networks are presented. These results ensure global exponential stability of memristor-based neural networks in the sense of Filippov solutions. In addition to providing criteria for memristor-based neural networks with time-varying delays, these stability conditions can also be used for memristor-based neural networks with constant time delays or without time delays. Furthermore, it is convenient to estimate the exponential convergence rates of this neural network by using the results. An illustrative example is given to show the effectiveness of the obtained results. (C) 2012 Elsevier B.V. All rights reserved.

关键词： Memristor Recurrent neural networks Global exponential stability Filippov solutions

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