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New criteria for exponential stability of delayed recurrent neural networks

Neurocomputing 2014年 134卷 182-188页

作者： Jian Xiao Zhigang Zeng Ailong Wu School of Automation Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China Wuhan 430074 China College of Mathematics and Statistics Hubei Normal University Huangshi 435002 China

In this paper, we investigate exponential stability of delayed recurrent neural networks. By using the delay partitioning method, some sufficient conditions are established to guarantee exponential stability of delayed recurrent neural networks under two different conditions with constructing new Lyapunov–Krasvoskii functional. This partitioning approach can reduce the conservatism comparing with some previous results of stability. At last, numerical examples are given out to show the effectiveness and advantage of our results.

关键词： Recurrent neural networks Exponential stability Time delay Delay partitioning approach

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Stability Analysis of Impulsive Positive Systems

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IFAC Proceedings Volumes 2014年第3期47卷 5987-5991页

作者： Ji-Shi Zhang Yan-Wu Wang Jiang-Wen Xiao Zhi-Hong Guan School of Automation Huazhong University of Science and Technology Wuhan 430074 China School of Software Henan University Kaifeng 475004 China Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China Wuhan 430074 China

This paper is concerned with the problems of stability for a class of impulsive positive systems. An impulsive positive system model is introduced for the first time and a necessary and sufficient condition guaranteeing the positivity of this kind of system is proposed. Several sufficient criteria of global exponential stability and global asymptotical stability for impulsive positive systems are established respectively by using a linear copositive Lyapunov function. Two numerical examples are given to illustrate the effectiveness and applicability of the proposed results.

关键词： Impulsive positive system Positivity Exponentially stable Asymptotically stable Linear copositive Lyapunov function

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Indoor localization system based on wearable posture sensors with incomplete observations

Indoor localization system based on wearable posture sensors...

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International Conference on Modelling, Identification and control (ICMIC)

作者： Yuan Wang Jian Huang Yongji Wang Chunjing Tao Heping Yan Lifang Ma Key Laboratory of Image Processing and Intelligent Control Huazhong University of Science and Technology Wuhan China R&D department of National Research Center for Rehabilitation Technical Aids Beijing China

ISBN: (纸本)9781479951055

Radio Frequency Identification (RFID) based indoor localization becomes a hotspot in the robotic research field recently. To overcome the shortcoming that plentiful tags are required in a normal RFID based localization system, this paper presents an indoor localization method by fusing measurements from wearable posture sensors and the absolute position information from scattered RFID tags. From the posture sensors, we can obtain the relative indoor localization data by summing up the vectors composed of step length and heading direction. Since this relative localization is highly affected by the cumulative error, the absolute positions of RFID tags are used as corrections if they are found within a read-range to the user. Because the RFID tags are sparsely placed in the indoor environment, the corrections can be achieved only at incomplete time instants. Therefore, a revised Kalman filter with incomplete observation is applied to the sensor fusion between the posture sensors and RFID tags. Experimental results show that the cumulative error of the system can be significantly reduced and the localization accuracy is enhanced through the sensor fusion.

关键词： Kalman filters Sensor systems Vectors RFID tags Magnetic sensors

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Design and control of an intelligent walking-aid robot

Design and control of an intelligent walking-aid robot

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International Conference on Modelling, Identification and control (ICMIC)

作者： Rui Han Chunjing Tao Jian Huang Yongji Wang Heping Yan Lifang Ma Key Laboratory of Image Processing and Intelligent Control Huazhong University of Science and Technology Wuhan China R&D department of National Research Center for Rehabilitation Technical Aids Beijing China

ISBN: (纸本)9781479951055

An intelligent walking-aid robot is presented for walking assistance, training and rehabilitation of the elderly. The robot is intended to provide physical support and mobility aid for the old people during their walking based on recognizing their motion intentions online. A force measuring system comprised of force sensing resisters (FSRs) is designed to obtain the interaction forces between the user and the robot. The user's motion intention is then estimated by analyzing the relationship between the measured interaction forces and human intention force/torque. Further the estimated intention is used to guide the admittance based motion control of robot. To ensure a safe walking, a laser range finder (LRF) is used to detect the distance between the robot and the user's legs. A distance restraint control is also designed and taken into action when the distance is found beyond a safe threshold. Experiments were conducted and the results verified the effectiveness of the developed robot system and control methods.

关键词： Legged locomotion Robot sensing systems Force measurement Force Motion measurement Laser modes

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Adaptive control for power and thermal management of an integrated 5kW solid oxide fuel cell system

Adaptive control for power and thermal management of an inte...

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第十五届全国氢能会议暨第7届两岸三地氢能研讨会

作者： Lin Zhang Jianhua Jiang Xi Li Huan Cheng Jie Yang Jian Li School of Automation Key Laboratory of Education Ministry for Image Processing and Intelligent ControlHuazhong University of Science & TechnologyWuhan430074China School of Materials Science and Engineering State Key Laboratory of Material Processing and Die and Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074China

A 5-kW dynamic solid oxide fuel cell(SOFC)system with a second air bypass has been developed with a model to perform both steady-state and dynamic analysis in this *** identifies and addresses the control challenges a... 详细信息

关键词： Solid oxide fuel cell (SOFC) Optimal set-points Load transitions RBF network based direct adaptive controller

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The influencesof different gas flow types on solid oxide fuel cell stack temperature distribution

The influencesof different gas flow types on solid oxide fue...

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第十五届全国氢能会议暨第7届两岸三地氢能研讨会

作者： Huan Cheng Xi Li Jianhua Jiang Yali Liu Jian Li School of automation Key Laboratory of Education Ministry for Image Processing and Intelligent ControlHuazhong University of Science & TechnologyWuhan430074China School of Materials Science and Engineering State Key Laboratory of Material Processing and Die and Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074China

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MULTI-TRACKING OF FIRST ORDER MULTI-AGENT NETWORKS VIA SELF-TRIGGERED control

MULTI-TRACKING OF FIRST ORDER MULTI-AGENT NETWORKS VIA SELF-...

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西南大学2014年全国博士生学术论坛(电子技术与信息科学领域)

作者： Guang-Song Han Zhi-Hong Guan Jie Chen Ding-Xin He Ming Chi College of Automation Huazhong University of Science and Technology Wuhan 430074 China and the Key Laboratory of Image Information Processing and Intelligent Control (Huazhong University of Science and Technology) Ministry of Education Wuhan 430074 China

A multi-tracking problem of multi-agent networks is investigated in this paper where multi-tracking refers to that the states of multiple agents in each subnetwork asymptotically converge to the same desired trajectory in the presence of information exchanges among *** multi-tracking of first order multi-agent networks with directed topologies was ***-triggered protocols were proposed along with triggering functions to solve the stationary multi-tracking and bounded dynamic *** self-triggered scheduling is obtained, and the system does not exhibit Zeno *** examples are provided to illustrate the effectiveness of the obtained criteria.

关键词： Multi-agent networks stationary multi-tracking bounded dynamic multi-tracking self-triggered control

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An Activity-List based Nested Partitions algorithm for Resource-Constrained Project Scheduling

An Activity-List based Nested Partitions algorithm for Resou...

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World Congress on intelligent control and Automation (WCICA)

作者： Lei Xiao Jing Tian Zhenyuan Liu School of Automation Huazhong University of Science and Technology Wuhan Hubei Province China Key Laboratory of Education Ministry for Image Processing and Intelligent Control University of Science and Technology Wuhan Hubei Province China

In this paper, we propose an Activity-List based Nested Partitions algorithm for solving the Resource-Constrained Project Scheduling Problem(RCPSP). This algorithm is based on traditional Serial Scheduling scheme (SSS) and partitions the feasible solution space which is formulated by activity-lists into subregions by the nested partitions approach. We also utilize Double Justification as local search to improve the solutions. The algorithm is tested on J120 in PSPLIB with the result that the algorithm is relatively effective for solving large-scale, complex RCPSPs.

关键词： Partitioning algorithms Algorithm design and analysis Heuristic algorithms Job shop scheduling Educational institutions Processor scheduling

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An improved column generation algorithm for crew scheduling problems

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Journal of Information and Computational Science 2013年第1期10卷 175-183页

作者： Chen, Shijun Shen, Yindong Image Processing and Intelligent Control Key Laboratory of Education Ministry Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

Column Generation (CG) technique is popularly applied in solving the crew scheduling problem of large size, which is generally modeled as an Integer Linear Programming (ILP) problem. The traditional CG algorithms for bus and rail crew scheduling encounter difficulties on either the generation of all potential shifts or solving subproblems. A subproblem embedded in the CG is generally represented as a Resource-constrained Shortest Path Problem (RCSPP), which is NP-hard and constitutes a major reason for the CG's slow convergence. This paper presents a novel CG strategy to improve the efficiency of the proposed crew scheduling approach. The main idea is that a reasonably large set of "good" potential shifts (called a shift-pool) is pre-compiled using problem-specific knowledge. During the CG process, the RCSPP is not constructed to generate potential shifts as new columns until no columns with Negative Reduced Cost (NRC) exist in the shift-pool. Experiments are carried out on a series of Chinese real-world problem instances, and the computational results show that the solving process is significantly accelerated. © 2013 by Binary Information Press.

关键词： Integer programming

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Mean-risk analysis of radio frequency identification technology in supply chain with inventory misplacement: Risk-sharing and coordination

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Omega 2014年 46卷 86-103页

作者： Shuang Chen Hongwei Wang Yong Xie Chao Qi Key Laboratory of Image Processing and Intelligent Control Institute of Systems Engineering Huazhong University of Science & Technology Wuhan 430074 PR China Economic Research Centre Technical Economy and Consultation Department Guangdong Electric Power Design Institute Guangzhou 510663 PR China

This paper investigates the application of radio frequency identification (RFID) technology to eliminate the misplacement problems in the supply chain, which consists of a risk-neutral manufacturer and a risk-averse retailer. By considering both fixed cost and tag cost of RFID implementation, we study the agents' incentives to adopt RFID in both uncoordinated and coordinated cases. We focus on analyzing the impact of risk attitudes on the agents’ incentives and on the supply chain coordination. The central semi-deviation is adopted to measure the retailer's risk attitude. In the uncoordinated case, we find that, in order to induce the retailer to adopt RFID, the manufacturer must assume more fixed cost if the retailer is more risk-averse. In the coordinated case, we first show that the standard revenue sharing contract does not always coordinate the channel. If the channel is coordinated, we observe that the agents’ incentives will be perfectly aligned and independent of the risk attitudes, if the revenue sharing ratio equals the fixed cost sharing ratio. Then we propose a risk-sharing contract that offers the risk protection to the retailer, to achieve the channel coordination. An interesting finding is that the manufacturer's incentive will not decrease with the tag cost, if she takes much risk from the retailer. The corresponding impacts of RFID adoption on the two contracts are also analyzed in this paper. Finally, a case study in a tobacco industry is presented to show the real RFID cost in practice.

关键词： RFID radio frequency identification MV mean–variance CSD central semi-deviation SSD second-order stochastic dominance PDF probability density function CDF cumulative density function Radio frequency identification Inventory misplacement Central semi-deviation Risk-averse Risk sharing Coordination

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