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作者： Chen, Feifei Sang, Nong Gao, Changxin Kuang, Xiaoqin Key Laboratory of Ministry of Education for Image Processing and Intelligent Control School of Automation Huazhong University of Science and Technology China

ISBN: (纸本)9781479957514

Recent methods based on mid-level visual concepts have shown promising capability in human action recognition field. Automatically discovering semantic entities such as parts for an action class remains challenging. In this paper, we focus on discovering distinctive action parts for recognition of human actions by learning and selecting a small number of discriminative part detectors directly from training videos. We initially train a large collection of candidate Exemplar-LDA detectors from clusters obtained by clustering spatiotemporal patches in whitened space. A novel Coverage-Entropy curve is proposed as a means of measuring the representative and discriminative capabilities of part detectors, and used to select a set of compact and meaningful detectors out of the vast candidates. By integrating these mined detectors into 'bag of parts' representation, our approach demonstrates state-of-the-art performance on the UCF50 dataset. © 2014 IEEE.

关键词： Semantics

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A fuzzy optimal sliding-mode guidance for intercepting problem 19

A fuzzy optimal sliding-mode guidance for intercepting probl...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Hou, Zhiwei Su, Mao Wang, Yongji Liu, Lei School of Automation Key Laboratory of Ministry of Education for Image Processing and Intelligent Control Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783902823625

In this paper, a novel terminal guidance law is proposed to solve the problem of exo-atmospheric interception. It is designed based on the proportional navigation (PN) and the classical optimal sliding-mode guidance (OSMG). It overcomes the shortcoming of these two traditional guidance laws and inherits their merits. Particularly, in the scenario of exo-atmospheric interception, when the maneuvering information of the targets are unavailable, the proposed guidance law has superior performance than the traditional guidance law. Briefly, to enhance the interceptive performance, we introduce the optimal control and sliding-mode control methods to the guidance law for maneuvering target's interception. On the other hand, the traditional proportional navigation law is introduced to intercept the target with a constant speed. After that, a fuzzy switching function is provided to harmonize both situations above, according to the real-time estimation of maneuver. To guarantee the stability of the law, a Lyapunov based condition is obtained. Finally, different from the two-dimensional simulation in most of the literatures of terminal guidance law researches, we illustrate our method in the nonlinear discrete three-dimensional simulation environment by the Runge-Kutta method. Compared with the pure OSMG and PN, the proposed law performs better. © IFAC.

关键词： Environmental regulations

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Different human behavior patterns in web surfing

Different human behavior patterns in web surfing

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International Conference on Vehicle and Mechanical Engineering and Information Technology, VMEIT 2014

作者： Pan, Jun Shan Hu, Han Ping Key Laboratory of Image Processing and Intelligent Control of Education Ministry School of Automation Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783038350606

Recently, understanding and modeling human behavior have attracted increasing interests. In this paper, we provide some statistical research on human behavior in Web surfing during special stage called Flash Crowd(FC). Approximate entropy is used to find out the FC stage. We quantify behavior patterns by interval time between two consecutive request behaviors. Kolmogorov-Smirnov statistical test is used to estimate the appropriate probability distribution function of interval time. The results show that the request behavior patterns varied in different stages. © (2014) Trans Tech Publications, Switzerland.

关键词： Distribution functions

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Exponential stability of impulsive positive systems with mixed time-varying delays

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IET control Theory and Applications 2014年第15期8卷 1537-1542页

作者： Wang, Yan-Wu Zhang, Ji-Shi Liu, Meng School of Automation Huazhong University of Science and Technology Wuhan430074 China School of Software Henan University Kaifeng475004 China Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China China

This study addresses the problem of exponential stability for a class of impulsive positive systems with mixed time-varying delays. A delayed 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. By using a copositive Lyapunov-Krasovskii functional and the average impulsive interval method, a sufficient criterion of global exponential stability for delayed impulsive positive systems is established in terms of linear programming problems. A numerical example is given to show the effectiveness of the proposed method. © 2014 The Institution of Engineering and Technology.

关键词： Lyapunov functions

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H∞ based decoupling tracking control of hypersonic vehicle 19

H∞ based decoupling tracking control of hypersonic vehicle

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Lan, Xuejing Wang, Zhishen Liu, Lei Wang, Yongji School of Automation Key Laboratory of Ministry of Education for Image Processing and Intelligent Control Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9783902823625

The H∞ based decoupling tracking control is studied in this paper. A virtual system constituted by the controlled system and the no coupling reference model is firstly set up. The controlled system is driven to follow the reference model to realize the decoupling. And the tracking error can be formulated by the H∞ norm of the virtual system. Then the controller is derived by minimizing the H∞ norm, which can be described by Linear Matrix Inequalities (LMIs). The necessary and sufficient condition of existence of controller is derived based on the LMIs above. A flight control example is given to illustrate the effectiveness of the proposed method. The simulation results show that the proposed method is of better control performance than Linear Quadratic (LQ) tracking controller. © IFAC.

关键词： controllers

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An optimal software maintenance policy based on reliability and risk

An optimal software maintenance policy based on reliability ...

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2014 International Joint Conference on Neural Networks, IJCNN 2014

作者： Xiaoping, Wang Fang, Zhou Yi, Shen School of Automation Key Laboratory of Ministry of Education for Image Processing and Intelligent Control Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781479914845

Software maintenance is assuming ever more a crucial role in the lifecycle of software due to the increase of software requirements and the high variability of software environment. Common approaches of studying software maintenance are to consider them as a static by-product of software operation and only the maintenance cost is covered. In this paper, software maintenance policies are studied with the consideration of software reliability and risk. An optimization model is defined to drive the choice of a maintenance schedule. The solution of the model provides the best maintenance policy and the choice of actual actions that will minimize the average maintenance cost while the software reliability and risk are acceptable. Finally, a numerical example is given to show the analysis process of our proposed policy. © 2014 IEEE.

关键词： Software reliability

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Optimal tuning of PI controller for full-order flux observer of induction motor using the immune genetic algorithm

Communications in Computer and Information Science

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Communications in Computer and Information Science 2014年 472卷 295-299页

作者： Luo, Hui Lv, Yunfei Yin, Quan Zhang, Huajun Key Laboratory of Ministry of Education for Image Processing and Intelligent Control Department of Control Science and Engineering Huazhong University of Science and Technology WuhanHubei430074 China The Second Ship Design Institution WuhanHubei430064 China

ISBN: (纸本)9783662450482

This paper presents a new method to tune the parameters of the adaptation PI controller of full-order flux observer. The method employs an Immune Genetic Algorithm (IGA) based optimization routine that can be implemented off-line. A novel fitness function is designed to assess both the estimation accuracy and the noise sensitivity of the rotor speed estimation system when each antibodys parameters are employed. The diversity of population is guaranteed by the evaluating of the antibody similarities function. The Roulette-wheel selection is used to choose the parents and large mutation probability is adopted to prevent the evolution from prematurity. The simulation results verify that the IGA has better performance in convergence speed and computation efficiency compared to the traditional GA. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Induction motors

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Quantum statistical edge detection using path integral monte carlo simulation

Communications in Computer and Information Science

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Communications in Computer and Information Science 2014年 472卷 430-434页

作者： Sun, Yangguang State Key Laboratory of Software Engineering Wuhan University WuhanHubei430072 China School of Computer Science South-Central University for Nationalities Key Laboratory of Education Ministry for Image Processing and Intelligent Control Huazhong University of Science and Technology WuhanHubei430074 China

ISBN: (纸本)9783662450482

A novel statistical method using path integral Monte Carlo simulation based on quantum mechanics to detect edges of interested objects was proposed in this paper. Our method was inspired by essential characteristics of quantum, and based on the quantum particle movement evolved towards the edge position with high probability density in the gradient-based image potential field. The discussion about computational complexity and parameter settings demonstrated the feasibility and robustness of our method. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Quantum theory

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Circuit design and exponential stabilization of memristive neural networks

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Neural networks : the official journal of the International Neural Network Society 2015年 63卷 48-56页

作者： Shiping Wen Tingwen Huang Zhigang Zeng Yiran Chen Peng Li Department of Control Science and Engineering 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. Electronic address: wenshiping226@***. Texas A & M University at Qatar Doha 5825 Qatar. Electronic address: tingwen.huang@qatar.tamu.edu. Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China Wuhan 430074 China. Electronic address: zgzeng527@***. Electrical and Computer Engineering Department University of Pittsburgh Pittsburgh PA 15261 USA. Electronic address: yic52@pitt.edu. Department of Electrical and Computer Engineering Texas A & M University College Station TX 77843 USA. Electronic address: pli@tamu.edu.

This paper addresses the problem of circuit design and global exponential stabilization of memristive neural networks with time-varying delays and general activation functions. Based on the Lyapunov-Krasovskii functional method and free weighting matrix technique, a delay-dependent criteria for the global exponential stability and stabilization of memristive neural networks are derived in form of linear matrix inequalities (LMIs). Two numerical examples are elaborated to illustrate the characteristics of the results. It is noteworthy that the traditional assumptions on the boundness of the derivative of the time-varying delays are removed.

关键词： Memristor Neural networks Stabilization

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An improved character segmentation algorithm based on local adaptive thresholding technique for Chinese NvShu documents

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Journal of Networks 2014年第6期9卷 1496-1501页

作者： Sun, Yangguang Cai, Zhihua College of Computer Science South-Central University for Nationalities Key Laboratory of Education Ministry for Image Processing and Intelligent Control Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Software Engineering Wuhan University College of Computer Science South-Central University for Nationalities Wuhan 430072 China

For the structural characteristics of Chinese NvShu character, by combining the basic idea in LLT local threshold algorithm and introducing the maximal betweenclass variance algorithm into local windows, an improved character segmentation algorithm based on local adaptive thresholding technique for Chinese NvShu documents was presented in this paper. Because of designing the corresponding correction parameters for the threshold and using secondary search mechanism, our proposed method could not only automatically obtain local threshold, but also avoid the loss of the character image information and improve the accuracy of the character image segmentation. Experimental results demonstrated its capability to reduce the effect of background noise, especially for Chinese NvShu character images with uneven illumination and low contrast. © 2014 Academy Publisher.

关键词： image segmentation

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