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A Novel Mat-Based System for Position-Varying Wireless Power Transfer to Biomedical Implants

IEEE TRANSACTIONS ON MAGNETICS 2013年第8期49卷 4774-4779页

作者： Xu, Qi Wang, Hao Gao, Zhaolong Mao, Zhi-Hong He, Jiping Sun, Mingui Huazhong Univ Sci & Technol Dept Control Sci & Engn Educ Minist Key Lab Image Proc & Intelligent Control Wuhan 430074 Peoples R China Univ Pittsburgh Dept Neurosurg Pittsburgh PA 15213 USA Univ Pittsburgh Dept Elect & Comp Engn Pittsburgh PA 15261 USA Arizona State Univ Dept Bioengn Tempe AZ 85287 USA

Wireless power transfer via magnetically resonant coupling is a new technology to deliver power over a relatively long distance. Here, we present a mat-based design to wirelessly power moving targets based on this technology. Our design is specifically applied to transcutaneously power medical implants within free-moving laboratory animals. Our system comprises a driver coil array, a hexagonally packed transmitter mat, a receiver coil, and a load coil, and generates a nearly flat magnetic distribution over a defined area to produce an approximately constant power output independent of the location of the receiver coil. This paper also describes a novel power receiver coil design of the same shape as the exterior of the implant, allowing for maximum magnetic coupling, eliminating the space restrictions due to the coil within the implant, and matching the resonant frequencies of the implant and the transmitter coil. Our new transmitter and receiver designs significantly reduce the size of a biomedical implant and may provide a lifetime power supply to implanted circuits without the need for an internal battery. Our designs are also useful in various other applications involving moving targets, such as part of a robot or a vehicle.

关键词： Biomedical implant driver-coil array magnetically resonant coupling mat-based design wireless power transfer (WPT)

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Stability in the numerical simulation of stochastic delayed Hopfield neural networks

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NEURAL COMPUTING & APPLICATIONS 2013年第7-8期22卷 1493-1498页

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

This paper is concerned with the mean-square stability of the Split-Step Backward Euler method for stochastic delayed Hopfield neural networks. The sufficient conditions to guarantee the mean-square stability of the Split-Step Backward Euler method are given. Moreover, an example of the comparison of our method with the Euler-Maruyama method is used to show the superiority of our method.

关键词： Stochastic delayed Hopfield neural networks Mean-square stability Split-Step Backward Euler method Euler-Maruyama method

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A reentry corridor calculation method for reusable Launch Vehicles based on skipping trajectory

A reentry corridor calculation method for reusable Launch Ve...

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Chinese control Conference (CCC)

作者： Kunliang Wei Lei Liu Yongji Wang Songtao Chang Department of Control Science and Engineering Huazhong University of Science and Technology Key Laboratory of Image Processing and Intelligent Control Wuhan 430074 China

A new method to calculate the corridor of Reentry Launch Vehicles is proposed, based on their dynamic properties. The upper boundary of the corridor can be calculated by the skipping trajectories from the lower boundary of the corridor. By combination with a specific kinematic equations and a numerical simulation, the reliability and optimality of the method is analyzed. The results also show that the traditional reentry corridor estimated by quasi-equilibrium gliding conditions has its conservativeness, the reentry corridor that the new method calculated can better reflect the RLV's maneuvers abilities. Moreover, compared to the general methods, the direct and indirect methods to calculate the corridor, which are usually used to solve optimization problems, the proposed method has a smaller amount of calculation, shorter calculation time, stronger convergence, thus has stronger practicability.

关键词： Electronic mail Vehicles Trajectory Radio frequency Educational institutions laboratories image processing

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Semi-Global Leader-Following Consensus of Linear Multi-Agent Systems With Input Saturation via Low Gain Feedback

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS 2013年第7期60卷 1881-1889页

作者： Su, Housheng Chen, Michael Z. Q. Lam, James Lin, Zongli Huazhong Univ Sci & Technol Dept Control Sci & Engn Image Proc & Intelligent Control Key Lab Educ Minist China Wuhan 430074 Peoples R China Univ Hong Kong Dept Mech Engn Hong Kong Hong Kong Peoples R China Univ Virginia Dept Elect & Comp Engn Charlottesville VA 22904 USA

This paper investigates the problem of leader-following consensus of a linear multi-agent system on a switching network. The input of each agent is subject to saturation. Low gain feedback based distributed consensus protocols are developed. It is established that, under the assumptions that each agent is asymptotically null controllable with bounded controls and that the network is connected or jointly connected, semi-global leader-following consensus of the multi-agent system can be achieved. Numerical examples are presented to illustrate this result.

关键词： Consensus input saturation leader-following low gain feedback

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An ant colony optimization routing algorithm for two order pickers with congestion consideration

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Computers & Industrial Engineering 2013年第1期66卷 77-85页

作者： Fangyu Chen Hongwei Wang Chao Qi Yong Xie Key Laboratory of Image Processing and Intelligent Control Institute of Systems Engineering Huazhong University of Science & Technology Hubei Wuhan 430074 People’s Republic of China

This paper develops a routing method to control the picker congestion that challenges the traditional assumption regarding the narrow-aisle order picking system. We proposes a new routing algorithm based on Ant Colony Optimization (ACO) for two order pickers (A-TOP) with congestion consideration. Using two extended dedicated heuristics with congestion consideration as reference group, a comprehensive simulation study is conducted to evaluate the effectiveness of A-TOP. The simulation proves that A-TOP achieves the shortest total picking time in most instances and performs well in dealing with the congestion. The impacts of warehouse layout, order size, and pick:walk-time ratio on A-TOP and system performance are analyzed as well. A-TOP can adapt to different warehouse configurations, meanwhile, it can be easily extended to the situation with more than two order pickers.

关键词： Routing method Order picking Ant colony optimization Congestion Warehouse management

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Dynamic Ca2+ sensitivity of BK channels

Dynamic Ca2+ sensitivity of BK channels

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The 10th Chinese Symposium on Calcium Signaling(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 Image Processing and Intelligent Control Huazhong University of Science and Technology Ministry of Education Department of Biomedical Engineering College of Life Science and Technology Wuhan Hubei China Department of pharmacology Soochow University college of pharmaceutical Sciences Suzhou 215123China Key Laboratory of Molecular Biophysics Huazhong University of Science and Technology Ministry of Education College of Life Science and Technology Wuhan Hubei China Department of Biomedical Engineering Center for the Investigation of Membrane Excitability DisordersCardiac Bioelectricity and Arrhythmia Center Washington University St Louis MO 63130 USA

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Event-triggered consensus of nonlinear multi-agent systems with nonlinear interconnections

Event-triggered consensus of nonlinear multi-agent systems w...

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Chinese control Conference (CCC)

作者： Xiuxia Yin Dong Yue Key Laboratory of Ministry of Education for Image Processing and Intelligent Control Huazhong University of Science and Technology Wuhan Hubei CN

This paper investigates the consensus problem for a set of nonlinear multi-agent systems with nonlinear interconnections. First, in order to reduce the communication burden in the multi-agent network, a distributed event-triggered consensus control is designed by taking into account the effect of the nonlinear interconnections. Then, based on the Lyapunov functional method and the Kronecker product technique, sufficient conditions are obtained to guarantee the consensus in the form of linear matrix inequality (LMI). Finally, a simulation example is proposed to illustrate the effectiveness of the developed theory.

关键词： Tin Multi-agent systems control design Lead Bandwidth Ear Nickel

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An Adaptive Algorithm for the Determination of the Onset and Offset of Muscle Contraction by EMG Signal processing

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IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING 2013年第1期21卷 65-73页

作者： Xu, Qi Quan, Yazhi Yang, Lei He, Jiping Huazhong Univ Sci & Technol Dept Control Sci & Engn Minist Educ Image Proc & Intelligent Control Neural Interface & Rehabil Res CtrKey Lab Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Sch Publ Hlth Tongji Med Coll Wuhan 430030 Peoples R China Arizona State Univ Dept Bioengn Tempe AZ 86287 USA

Estimation of on-off timing of human skeletal muscles during movement is an ongoing issue in surface electromyography (sEMG) signal processing for relevant clinical applications. Widely used single threshold methods still rely on the experience of the operator to manually establish a threshold level. In this paper, a novel approach to address this issue is presented. Based on the generalized likelihood ratio test, the maximum likelihood (ML) method is improved with an adaptive threshold technique based on the signal-to-noise ratio (SNR) estimate in the initial time before accurate sEMG analyses. The dependence of optimal threshold on SNR is determined by minimizing the onset/offset estimate error on a large set of simulated signals with well-known signal parameters. Accuracy and precision of the algorithm were assessed by using a set of simulated signals and real sEMG signals recorded from two healthy subjects during elbow flexion-extension movements with and without workload. Comparison with traditional algorithms shows that with amoderate increase in the computational effort the ML algorithm performs well even for low levels of EMG activity, while the proposed adaptive method is most robust with respect to variations in SNRs. Also, we discuss the results of analyzing the sEMG recordings from the selected proximal muscles of the upper limb in two hemiparetic subjects. The detection algorithm is automatic and user-independent, managing the detection of both onset and offset activation, and is applicable in presence of noise allowing use by skilled and unskilled operators alike.

关键词： Adaptive decision threshold electromyography (EMG) signal maximum likelihood method muscle contraction

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

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JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS 2013年第8期350卷 2354-2370页

作者： Wen, Shiping Zeng, Zhigang Huang, Tingwen Chen, Yiran Huazhong Univ Sci & Technol Sch Automat Wuhan 430074 Peoples R China Educ Minist China Key Lab Image Proc & Intelligent Control Wuhan 430074 Peoples R China Texas A&M Univ Qatar Doha 5825 Qatar Univ Pittsburgh Dept Elect & Comp Engn Pittsburgh PA 15261 USA

This paper investigates the delay-dependent exponential passivity problem of the memristor-based recurrent neural networks (RNNs). Based on the knowledge of memristor and recurrent neural network, the model of the memristor-based RNNs is established. Taking into account of the information of the neuron activation functions and the involved time-varying delays, several improved results with less computational burden and conservatism have been obtained in the sense of Filippov solutions. A numerical example is presented to show the effectiveness of the obtained results. (C) 2013 The Franklin Institute, Published by Elsevier Ltd. All rights reserved.

关键词： Memristors

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Fuzzy modeling and synchronization of different memristor-based chaotic circuits

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PHYSICS LETTERS A 2013年第34-36期377卷 2016-2021页

This Letter is concerned with the problem of fuzzy modeling and synchronization of memristor-based Lorenz circuits with memristor-based Chua's circuits. In this Letter, a memristor-based Lorenz circuit is set up, and illustrated by phase portraits and Lyapunov exponents. Furthermore, a new fuzzy model of memristor-based Lorenz circuit is presented to simulate and synchronize with the memristor-based Chua's circuit. Through this new fuzzy model, two main advantages can be obtained as: (1) only two linear subsystems are needed;(2) fuzzy synchronization of these two different chaotic circuits with different numbers of nonlinear terms can be achieved with only two sets of gain K. Finally, numerical simulations are used to illustrate the effectiveness of these obtained results. (C) 2013 Elsevier B.V. All rights reserved.

关键词： Memristor Lorenz circuit Fuzzy system Synchronization

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