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3rd International Conference on Autonomic and Autonomous systems, ICAS 2007

作者： Na, Meng Ding, Li Jia, Peifa State Key Laboratory of Intelligent Technology and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)076952799X

The significant research objective of virtual human is to generate realistic movement like real-life person. For the most frequent daily activity of target reaching movement of human upper limb, teach and playback method is proposed to generate vivid human motion, which combines respective merits of parametric keyframe, kinematics, dynamics, and motion capture methods together. First, the tip trajectory and velocity rules are learned and estimated by a weighted least squares support vector machine (WLS-SVM) and a combined half-Gaussians model respectively. Then an inverse kinematic method with dynamic constraint, damped least squares (DLS), is used to calculate the joint angles of the upper limb. Finally, the experimental results show that once the target position is appointed, the 3D virtual human skeleton model can generate realistic reaching movement. © 2007 IEEE.

关键词： Inverse kinematics

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Design of a silicon beam for detecting deflagration of trace explosive

Design of a silicon beam for detecting deflagration of trace...

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International Conference on Information Acquisition, ICIA 2007

作者： Qi, Yongguang Zhu, Jianbin Kong, Deyi Wang, Xiaohua State Key Laboratory of Transducer Technology Institute of Intelligent Machines Chinese Academy of Sciences Hefei 230031 China Department of Automation University of Science and Technology of China Hefei 230026 China

ISBN: (纸本)1424412196

Deflagration experiments of trace explosive were presented;A kind of sensitive silicon beam for detecting radiation in the deflagration of trace explosive was designed. The silicon beam had a heating and a thermal resistors on it, used as stimulating and detecting elements respectively. Thermal -Electric simulation of the silicon beam was carried out by finite element analysis software ANSYS, and some silicon beams of this kind have already been fabricating now. These works provide basis for developing a new device for detecting trace explosive. ©2007 IEEE.

关键词： Explosives

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Frequency recovery of band-limited seismic data based on sparse spike train deconvolution 77

Frequency recovery of band-limited seismic data based on spa...

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77th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2007

作者： Lu, Wen-Kai Liu, Dong-Qi Key State Lab. of Intelligent Technology and System Institute of Information Processing Department of Automation Tsinghua University China Institute of Geophysics PetroChina Research Institute of Petroleum Exploration and Development China

ISBN: (纸本)9781604238976

An iterative algorithm is presented for the frequency recovery of the band-limited seismic data based on the sparse spike train deconvolution (SSTD) method using the minimum entropy criterion. In this method, we exploit an upper limit nonlinear function to construct a new entropy measure, which is insensitive to the large value. Furthermore, a parameter of the nonlinear function is adopted to control the sparsity of the deconvolved signal. Synthetic data experiments are provided and the results show that this method performs well at low computation time. © 2007 Society of Exploration Geophysicists. All rights reserved.

关键词： Functions

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Recent advances in networked control systems

Recent advances in networked control systems

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International Conference on Control, automation and systems, ICCAS 2007

作者： Sun, Zengqi Li, Hongbo Wang, Yan Department of Computer Science and Technology State Key Laboratory of Intelligent Technology and Systems Tsinghua University Beijing 100084 China School of Automation Science and Electrical Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

ISBN: (纸本)8995003871

This paper presents a comprehensive overview of the current state of research in the area of Networked control systems (NCSs) first. Then two modeling and control methods are introduced for NCSs in details. The first one is a stochastic control method, which investigates the H∞ control problem for NCSs with random network-induced delay. The second one is a switch control method, which focuses on solving the stabilization problem for NCSs in discrete-time domain, where both network-induced delay and packet dropout are taken into account. Illustrative examples are given to demonstrate the effectiveness of the proposed approaches. Finally, this paper concludes with the discussion of possible future development of NCSs from a control perspective.

关键词： Networked control systems

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Optimal Dimensionality Discriminant Analysis and Its Application to Image Recognition

Optimal Dimensionality Discriminant Analysis and Its Applica...

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Conference on Computer Vision and Pattern Recognition (CVPR)

作者： Feiping Nie Shiming Xiang Yangqiu Song Changshui Zhang State Key Laboratory of Intelligent Technology and Systems Department of Automation Tsinghua University Beijing China

Dimensionality reduction is an important issue when facing high-dimensional data. For supervised dimensionality reduction, linear discriminant analysis (LDA) is one of the most popular methods and has been successfully applied in many classification problems. However, there are several drawbacks in LDA. First, it suffers from the singularity problem, which makes it hard to preform. Second, LDA has the distribution assumption which may make it fail in applications where the distribution is more complex than Gaussian. Third, LDA can not determine the optimal dimensionality for discriminant analysis, which is an important issue but has often been neglected previously. In this paper, we propose a new algorithm and endeavor to solve all these three problems. Furthermore, we present that our method can be extended to the two-dimensional case, in which the optimal dimensionalities of the two projection matrices can be determined simultaneously. Experimental results show that our methods are effective and demonstrate much higher performance in comparison to LDA.

关键词： Image analysis Image recognition Linear discriminant analysis Laboratories Scattering intelligent systems automation Preforms Face recognition Information science

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Teach and Playback of Realistic Target Reaching Movement of Virtual Human Upper Limb

Teach and Playback of Realistic Target Reaching Movement of ...

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International Conference on Autonomic and Autonomous systems (ICAS)

作者： Meng Na Li Ding Peifa Jia State Key Laboratory of Intelligent Technology and System Department of Computer Science and Technology Tsinghua University Beijing China

关键词： Humans Joints Kinematics Skeleton Motion control Motion analysis Mathematics Laboratories intelligent systems Computer science

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Structure design of sensor for detecting deflagration of trace explosive

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Weixi Jiagong Jishu/Microfabrication technology 2007年第2期 36-40页

作者： Zhu, Jian-Bin Qi, Yong-Guang Kong, De-Yi Wang, Xiao-Hua State Key Laboratory of Transducer Technology Institute of Intelligent Machines Chinese Academy of Sciences Hefei 230031 China Department of Automation University of Science and Technology of China Hefei 230026 China

Explosive detecting technology can be used in usual explosive and mine detection, available in both military and civilian affairs. Different explosives have different deflagration temperatures and exothermic phenomena and these characteristics can be used as criterions of explosive detecting. The deflagration phenomena and rule of the trace TNT were experimentally studied. By the experimental results, a highly sensitive silicon beam integrated of heating and detecting elements was designed. The finite element simulation results of the silicon beam indicate that the silicon beam can be rapidly heated to deflagration temperature of the explosives and the temperature is uniformly distributed. So, it can detect 1 ng of TNT. This work lays a foundation for the silicon beam fabrication using MEMS technology and development of a new Portable explosive detector.

关键词： Deflagration Silicon beam Trace explosive

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Dynamic Surface Control for Hypersonic Aircraft Using Fuzzy Logic system

Dynamic Surface Control for Hypersonic Aircraft Using Fuzzy ...

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2007 IEEE International Conference on automation and Lofistics

作者： DaoXiang Gao ZengQi Sun TianRong Du State Key Laboratory of Intelligent Technology and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)9781424415304;1424415306

An adaptive fuzzy control strategy is proposed for the hypersonic aircraft. Fuzzy logic system is used to compensate the unknown nonlinearities and modeling errors caused by changes of flight conditions. The DSC method eliminates the "explosion of terms" inherent existing in the conventional back-stepping method. Stability analysis shows that the control law can guarantee the semi-globally uniform boundedness of the solution of the closed-loop system. Numerical simulation use the longitudinal model of a hypersonic aircraft to demonstrate the effectiveness of the proposed strategy.

关键词： Back-stepping Dynamic surface control Adaptive fuzzy control Flight control Hypersonic aircraft

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Robust Tracking Control of a Three-DOF Planar Under-actuated Manipulator

Robust Tracking Control of a Three-DOF Planar Under-actuated...

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International Conference on Control and automation (ICCA)

作者： Licheng Wu Shengping Liu Zhen Lu State Key Laboratory of Intelligent Technology and System Tsinghua University Beijing China School of Automation Science and Electrical Engineering Beijing Aeronautics and Astronautics University Beijing China

A manipulator with free joints is a class of under-actuated mechanisms. Control of such systems is one of major topics in robotics and control engineering. In this paper, we develop a nonlinear feedback controller to force a three-dof planar under-actuated manipulator affected by smooth, bounded uncertainties to globally asymptotically track a reference trajectory. This under-actuated manipulator moving in a horizontal plane has two prismatic actuated joints and one revolute free joint. The control development is based on some coordinate transformations, Lyapunov's direct method and popular integrator backstepping technique. Numerical simulations are presented that demonstrate the effectiveness of the controller.

关键词： Robust control Manipulators Control systems Robot kinematics Control engineering Adaptive control Force control Force feedback Uncertainty Trajectory

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Computer Vision Method in Human Motion Detection

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Defence technology（防务技术） 2007年第1期3卷 54-58页

作者：傅莉方帅徐心和 Department of Autocontrol Shenyang Institute of Aeronautical Engineering Key Laboratory of Process Industry Automation Ministry of Education Northeastern University State Key Laboratory of Intelligence Technology and System Tsinghua University Beijing 100084 China

Human motion detection based on computer vision is a frontier research topic and is causing an increasing attention in the field of computer vision research. The wavelet transform is used to sharpen the ambiguous edges in human motion image. The shadow’s effect to the image processing is also removed. The edge extraction can be successfully realized. This is an effective method for the research of human motion analysis system.

关键词：计算机视觉法人体运动检测图象重建小波变换

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