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作者： Mohammadzadeh, M. Shahabadi, M. Soltanian-Zadeh, H. Tavakoli, A. Rafiei, B. Javidnia, D. Oghabian, M.A. Department of Physics Amir-Kabir University of Technology Tehran Iran School of Electrical and Computer Engineering University of Tehran Tehran Iran Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran Iran Image Analysis Laboratory Department of Radiology Henry Ford Health System Detroit MI United States Department of Electrical Engineering Amir-Kabir University of Technology Tehran Iran Medical Imaging Center Imam Khomeyni Hospital Tehran Iran Research Center for Science and Technology in Medicine Tehran University of Medical Sciences Tehran Iran

In this paper, design principles and application of a thin and flexible intravascular top hat monopole probe with increased signal-to-noise ratio (SNR) and improved longitudinal and radial coverage are described and compared with the conventional monopole probe. The top hat probe is constructed by removing a segment of the shield of a coaxial cable. A flexible thin copper foil in contact with the inner conductor of the cable is added to the end section of the cable. The copper foil acts as an antenna top hat load increasing the uniformity of the current distribution on the probe and establishes a uniform region of SNR distribution around the probe. Improvement of the SNR distribution of the top hat probe relative to the conventional monopole probe is evaluated using quantitative indices. Experimental results show that for the top hat probe, the ratio of the maximum image SNR to its relative standard deviation (SR) is 2.73 times higher than that of a conventional probe. © 2006 IOP Publishing Ltd.

关键词： Medical imaging

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Modeling and Analyzing Multi-agent Task Plans for Intelligent Virtual Training System using Petri Nets

Modeling and Analyzing Multi-agent Task Plans for Intelligen...

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World Congress on Intelligent control and Automation (WCICA)

作者： Linqin Cai Tao Mei Yining Sun Lei Sun Zuchang Ma Department of Automation Center for Biomimetic Sensing and Control Research Center for Biomimetic Sensing and Control ResearchChinese Academy of sciences University of Science and Technology of China Hefei China Institute of Computer Application Chinese Academy of Engineering and Physics Mianyang China

Integrated virtual reality with intelligent tutoring system, a multi-agent architecture was proposed for intelligent virtual training system (IVTS) for mine safety training. In order to make sure IVTS agent's task plans reliable and adaptive, a Petri nets-based declarative method was applied to model the virtual training task planning knowledge, which was represented as task planning knowledge Petri nets (TP-PNets), and an algorithm was implemented to construct TP-PNets. Then, hierarchy colored Petri nets (HCPN) was used to model multi-agent task planning behaviors for IVTS, and simulation and message sequence chart was used to analyze and verify the agent task planning HCPN model

关键词： Intelligent systems Petri nets Machine intelligence Virtual reality Railway safety Sun Biomimetics Automatic control control systems computer architecture

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Anti-windup control for an air-breathing hypersonic vehicle model

Anti-windup control for an air-breathing hypersonic vehicle ...

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AIAA Guidance, Navigation, and control Conference 2006

作者： Groves, Kevin P. Serrani, Andrea Yurkovich, Stephen Bolender, Michael A. Doman, David B. Collaborative Center of Control Science Ohio State University Columbus OH 43210 United States Air Force Research Laboratory Wright-Patterson AFB OH 45433 United States Harris Corporation FL United States Department of Electrical and Computer Engineering 2015 Neil Ave. AIAA United States Department of Electrical and Computer Engineering 2015 Neil Ave. Columbus OH United States AFRL/VACA 2210 Eighth St. United States

ISBN: (纸本)1563478196

An anti-windup controller modification is implemented in control system design for a model of the longitudinal dynamics of an air-breathing hypersonic vehicle. Anti-windup control allows the input constraints to be considered explicitly in the design of linear controllers to track a reference trajectory for the vehicle velocity, altitude, and angle of attack. The presence of anti-windup alleviates the need of keeping large penalties on the magnitude of the control input to avoid the occurrence of saturation. This, in turn, allows tighter tuning of the controller gains to obtain faster and more accurate trajectory tracking. The paper employs recent developments in anti-windup design to deal with the presence of exponentially unstable dynamics, which are typically encountered in air-breathing vehicle models. Simulation results on a fully nonlinear model are presented to validate the controller design. Copyright © 2006 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Hypersonic aerodynamics

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Automatic Text Summarization for Dialogue Style

Automatic Text Summarization for Dialogue Style

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International Conference on Information and Automation (ICIA)

作者： Chuanhan Liu Yongcheng Wang Fei Zheng Department of Computer Science and Engineering Shanghai Jiaotong University Shanghai China Center for Biomimetic Sensing and Control Research Institute of Intelligent Machines CAS Hefei Anhui China

Automatic text summarization for dialogue style is a relatively new research area. Some key techniques are proposed in this paper, such as identifying whether or not the style of document is dialogue, identifying all of questions and their corresponding answers and linking them to form question-answer pairs. Due to the interactive nature of dialogue documents, local regions of coherence often stretch across different speakers. An approach to automatically identify those regions of local coherence is presented. Firstly, we identify all question paragraphs in a given document. Secondly, we detect the answer paragraphs of each question paragraph and exploit text segmentation to form question-answer pairs. Lastly, we extract some sentences from the generic content and the question-answer pairs to generate a complete summary. Experimental results show that our approach is high efficient and improves significantly the coherency of the summary while not compromising informativeness

关键词： Data mining Logic programming Internet Information retrieval Natural languages computer science Biomimetics Machine intelligence Content addressable storage Joining processes

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Approximate feedback linearization of an air-breathing hypersonic vehicle

Approximate feedback linearization of an air-breathing hyper...

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AIAA Guidance, Navigation, and control Conference 2006

作者： Parker, Jason T. Serrani, Andrea Yurkovich, Stephen Bolender, Michael A. Doman, David B. Collaborative Center of Control Science Ohio State University Columbus OH 43210 United States Air Force Research Laboratory Wright-Patterson AFB OH 45433 United States Department of Electrical and Computer Engineering 2015 Neil Ave. United States AIAA United States AFRL/VACA 2210 Eighth St. United States

ISBN: (纸本)1563478196

This paper describes the design of a nonlinear control law for an air-breathing hypersonic vehicle. The model of interest includes flexibility effects and intricate couplings between the engine dynamics and flight dynamics. To overcome the analytical intractability of this model, a nominal control-oriented model is constructed for the purpose of feedback control design. Analysis performed on the nominal model reveals the presence of unstable zero dynamics with respect to the output to be controlled, namely altitude and velocity. By neglecting certain weaker couplings and resorting to dynamic extension at the input side, a simplified nominal model with full vector relative degree with respect to the regulated output is obtained. Standard dynamic inversion can then be applied to the simplified nominal model, and this results in approximate linearization of the nominal model. Finally, a robust outer loop control is designed using LQB, with integral augmentation in a model reference scheme. Simulation results are provided to demonstrate that the approximate feedback linearization approach achieves excellent tracking performance on the truth model for two choices of the system output. Finally, a brief case study is presented to qualitatively demonstrate the robustness of the design to parameter variations. Copyright © 2006 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Hypersonic aerodynamics

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Exponential stability for switched delay systems based on average dwell time technique and Lyapunov function method

Exponential stability for switched delay systems based on av...

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American control Conference (ACC)

作者： Xi-Ming Sun G.M. Dimirovski Jun Zhao Wei Wang Research Center of Information and Control Dalian University of Technology Dalian China SS Cyril Ss Cyril and Methodius University Skopje Macedonia Department of Computer Engineering Dogus University Istanbul Turkey School of Information Science and Engineering Northeastern University Shenyang China

This paper considers the problem of guaranteed exponential stability of switched delay systems by using Lyapunov function method, Razumikhin technique. The scheme of average dwell time is introduced into the switched delay systems. Based on the scheme of average dwell time, sufficient conditions for exponential stability of switched delay systems are presented. For a certain class of switched delay systems, a lower bound on the average dwell time guaranteeing exponential stability can be explicitly calculated via the solutions of some linear matrix inequalities (LMIs). A numerical example is given to illustrate the effectiveness of the proposed method

关键词： Delay systems Lyapunov method Switched systems Delay effects Stability analysis Sun Sufficient conditions Linear matrix inequalities control systems Asymptotic stability

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Stereo Vision based Relative Pose and Motion Estimation for Unmanned Helicopter Landing

Stereo Vision based Relative Pose and Motion Estimation for ...

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International Conference on Information and Automation (ICIA)

作者： Cui Xu Liankui Qiu Ming Liu Bin Kong Yunjian Ge Department of Automation University of Science and Technology Hefei Anhui China Center for Biomimetic Sensing and Control Research Institute of Intelligent Machines Chinese Academy and Sciences Hefei Anhui China Department of Electrical and Computer Systems Engineering Monash University Melbourne VIC Australia

In this paper, we present a real-time stereo vision based pose and motion estimation system that will be used for landing an unmanned helicopter on a moving target such as a ship deck. The vision algorithm mainly consists of a feature extraction task and a pose and motion estimation task. The 2D planer target with regular features defined can significantly simplify the feature extraction task such as corner detection and feature points matching. To effectively estimate the distance between the camera carrier and target a stereo camera system is applied. By means of sub-pixel corner location the precisions of pose estimation and relative motion detection can be improved. We present results from semi-physical simulation which show that our vision algorithm is accurate and robust. The methodology provides an effective subsystem for the development of autonomous robot helicopter that will land on a given target under the guide of vision.

关键词： Stereo vision Motion estimation Helicopters Feature extraction Cameras Robot vision systems Real time systems Marine vehicles Metalworking machines computer vision

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Development of Portable Wireless Brain computer Interface with Embedded Systems

Development of Portable Wireless Brain Computer Interface wi...

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2006 IEEE Biomedical Circuits and Systems Conference (BioCAS 2008)

作者： Chin-Teng Lin Hung-Yi Hsieh Li-Wei Ko May Lin Sheng-Fu Liang Department of Electrical and Control Engineering Computer Science National Chiao Tung University Hsinchu Taiwan Department of Electrical and Control Engineering Brain Research Center National Chiao Tung University Hsinchu Taiwan Department of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan

In this paper, we propose an embedded multi-task scheduling system to make the wireless brain computer interface to real-time receive electroencephalogram signal more accurate. This method we propose also can increase the flexibility of the system. Base on the method, we can change the peripheral devices easily. And the tasks are taken as modules, so it also can increase the flexibility of system programs. The proposed system integrates electroencephalogram signal amplifier technique, wireless transmission technique, and embedded real-time system. The OMAP (Open Multimedia Architecture Platform) is used as a development platform and an embedded operating system is also used.

关键词： Wireless communication Digital signal processing Electroencephalography Real time systems Band pass filters Logic gates Memory management

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Fabrication and characterization of GaAs/AlGaAs planar resonant tunneling transistor

Fabrication and characterization of GaAs/AlGaAs planar reson...

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IEEE Nanotechnology Materials and Devices Conference (NMDC)

作者： SeungHun Son JungIl Lee YongJu Park YunSeop Yu SungWoo Hwang Doyal Ahn Departmentof Electronics & Computer Engineering Korea University Seoul South Korea Semiconductor Materials Laboratory Nano Device Research Center Korea Institute of Science and Technology Seoul South Korea Department of Information & Control Engineering Hankyong National University Anseong Gyeonggi South Korea Institute of Quantum Information Processing & Systems University of Seoul Seoul South Korea

We have demonstrated electron transport in enhancement mode in-plane-gate (IPG) quantum dot (QD) transistors. A deep etched trench allows a large positive bias on the IPG, with negligible leakage current. Such enhancement mode operation has made it possible to populate ultra-small QDs with electrons. Strong NDR peaks and SET are observed in a wide gate bias window. The position of the NDR peaks systematically moves with the change of gate bias until, and also after the SET regime is reached. The size of the QD is estimated from the SET data, giving quantum energy level spacing consistent with the evolved NDR positions.

关键词： Fabrication Gallium arsenide Resonant tunneling devices Capacitance Quantum computing Electrons Etching Transistors Quantum dots Energy states

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Abstracts from the 6th International Conference on the engineering of Sport, 10-14 July 2006, Olympic Hall, Munich, Germany Abstracts

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SPORTS engineering 2006年第2期9卷 107-127页

作者： [Anonymous] University of Massachusetts Lowell USA Science & Mathematics Department Kettering University Flint USA University of Illinois USA Western Michigan University USA Washington State University USA Casecade Engine USA Kanazawa University Japan Sumitomo Light Metal Japan Massachusetts Institute of Technology USA Nanyang Technological University Bioengineering Singapore University of Vienna Anthropology Austria Department of Mechanical Engineering University of Bath UK INSA Lyon France PETZL France Sports Materials Research Group University of Birmingham UK Laboratoire de Modélisation des Activités Sportives Bourget du Lac France Technical University Kaiserslautern Germany Department of Engineering Mechanics United States Air Force Academy Colorado Springs USA SRAM Corporation Colorado Springs USA Sports Engineering Research Group University of Sheffield UK Sports Engineering CSES Sheffield Hallam University USA Sports Engineering CSES Sheffield Hallam University UK Technische Universität München Germany Rush University Medical Center Chicago USA Faculty of Sports Science Department of Sport Equipment & Materials TU München Germany RMIT University Australia Institute of Health and Sports Sciences University of Tsukuba Ibaraki Japan Machine and Control Department Polytechnic University Kanagawa Japan SRI Sports Ltd. Hyogo Japan SRI Research and Development Ltd. Hyogo Japan Mizuno Corporation Osaka Japan Fukuoka Institute of Technology Fukuoka Japan University of Limerick Éire Graduate School of Engineering Hokkaido University Japan Faculty of Engineering Kitami Institute of Technology Japan University of Calgary Canada TaylorMade-adidas Golf Company USA Davis Mechanical Engineering University of California USA Davis Mechanical & Aeronautical Engineering University of California USA University of Wales Institute Cardiff Cardiff School of Sport UWIC Cardiff Cardiff School of Sport UWIC Wales Loughborough University UK Cranfield University UK Cr

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