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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Ligang Wu James Lam Wojciech Paszke Krzysztof Galkowski Eric Rogers Anton Kummert Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin P. R. China The University of Hong Kong Hong Kong Hong Kong China Institute of Control and Computation Engineering University of Zielona Góra Góra Poland School of Electronics and Computer Science University of Southampton Southampton U.K Faculty of Electrical Information and Media Engineering Communication Theory University of Wuppertal Germany

This paper considers the general filtering problem for a distinct class of two-dimensional (2-D) discrete linear systems, i.e. information propagation in two independent directions, known as discrete linear repetitive processes which are of both system-theoretic and applications interest. In particular, new results on the design of filters with guaranteed levels of performance are developed. These take the form of algorithms for the design of an H infin and l 2 -l infin dynamic output feedback filter which guarantees that the resulting filtering error process is stable and has prescribed disturbance attenuation performance as measured by H infin and l 2 -l infin norms.

关键词： Nonlinear filters Filtering Symmetric matrices Space technology Communication system control Attenuation measurement Algorithm design and analysis Iterative algorithms Optimal control Stability

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A Tutorial on the Mechanisms, Dynamics, and control of Atomic Force Microscopes

A Tutorial on the Mechanisms, Dynamics, and Control of Atomi...

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American control Conference (ACC)

作者： Daniel Y. Abramovitch Sean B. Andersson Lucy Y. Pao Georg Schitter Engineer in the Nanotechnology Group Agilent Laboratories Santa Clara CA USA Mechanical Engineering Boston University Boston MA USA Electrical and Computer Engineering University of Colorado Boulder Boulder CO USA Delft Center for Systems and Control Delft University of Technnology Delft Netherlands

The atomic force microscope (AFM) is one of the most versatile tools in nanotechnology. For control engineers this instrument is particularly interesting, since its ability to image the surface of a sample is entirely dependent upon the use of a feedback loop. This paper will present a tutorial on the control of AFMs. We take the reader on a walk around the control loop and discuss each of the individual technology components. The major imaging modes are described from a controls perspective and recent advances geared at increasing the performance of these microscopes are highlighted.

关键词： Tutorial Force control Atomic force microscopy Optical imaging Scanning electron microscopy Nanobioscience Transmission electron microscopy Image resolution Biomedical optical imaging Probes

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Output feedback control and sensor placement for a hypersonic vehicle model

Output feedback control and sensor placement for a hypersoni...

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AIAA Guidance, Navigation, and control Conference 2007

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

ISBN: (纸本)1563479044

This paper addresses issues related to output feedback control, including sensor placement, for a model of an air-breathing hypersonic vehicle. The model presents a number of control challenges, in particular because of strong couplings between the propulsive and aerodynamic forces. Because of the vehicle's low weight, slenderness, and length, the vehicle's flexibility has a large impact on stability and control of the vehicle. Two output feedback control methods are developed. One applies reconstruction of the flexible body system states, toward applications of state feedback control. The other uses a robust design that does not rely on an observer to ensure stabilization and performance throughout a given flight envelope. A rate gyroscope and an accelerometer have been modeled, incorporating the flexible effects, and strategies for sensor placement have been developed for the hypersonic vehicle model to enhance observability or to preserve certain system structures that are favorable for robust control design. Simulation results are provided to demonstrate the sensor placement strategies and output feedback control performances.

关键词： Feedback control

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Interior-Point Algorithms for Sum-Of-Squares Optimization of Multidimensional Trigonometric Polynomials

Interior-Point Algorithms for Sum-Of-Squares Optimization of...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Tae Roh Bogdan Dumitrescu Lieven Vandenberghe Electrical Engineering Department University of California Los Angeles Los Angeles CA USA International Center for Signal Processing Tampere University of Technology Tampere Finland Department of Automatic Control and Computer Politechnica University of Bucharest Romania

A wide variety of optimization problems involving nonnegative polynomials or trigonometric polynomials can be formulated as convex optimization problems by expressing (or relaxing) the constraints using sum-of-squares representations. The semidefinite programming problems that result from this formulation are often difficult to solve due to the presence of large auxiliary matrix variables. In this paper we extend a recent technique for exploiting structure in semidefinite programs derived from sum-of-squares expressions to multivariate trigonometric polynomials. The technique is based on an equivalent formulation using discrete Fourier transforms and leads to a very substantial reduction in the computational complexity. Numerical results are presented and a comparison is made with general-purpose semidefinite programming algorithms. As an application, we consider a two-dimensional FIR filter design problem.

关键词： Multidimensional systems Polynomials Signal processing algorithms Multidimensional signal processing Constraint optimization Discrete Fourier transforms computational complexity Finite impulse response filter Optimization methods Digital filters

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Meta-search utilizing evolutionary recommendation: A web search architecture proposal

Meta-search utilizing evolutionary recommendation: A web sea...

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1st International Workshop on Intelligent Web Based Tools, IWBT 2007 - In Conjunction with the 19th IEEE International conference on Tools with Artificial Intelligence, ICTAI 2007

作者： Húsek, Dušan Keyhanipour, Amir Moshiri, Behzad Owais, Suhail S.J. Snášel, Václav Krömer, Pavel Platoš, Jan Institute of Computer Science Academy of Sciences of the Czech Republic CZ182O7 Prague Czech Republic Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Iran Information Technology Al-Balqa' Applied University Ajloun University College P.O. Bo 6 JO 2681O Ajloun Jordan FEECS Dept. of Computer Science VŠB Technical University of Ostrava 17. listopadu 15 CZ 708 33 Ostrava-Poruba Czech Republic

An innovative meta-search engine named WebFusion has been presented. The search system learns the expertness of every particular underlying search engine in a certain category based on the users' preferences according to an analysis of click-through behavior. In addition, an intelligent re-ranking method based on ordered weighted averaging (OWA) was introduced. The re-ranking method was used to fuse the results' scores of the underlying search engines. Independently, a progressive application of evolutionary computing to optimize Boolean search queries in crisp and fuzzy information retrieval systems was investigated, evaluated in laboratory environment and presented. In this paper we propose an incorporation of these two innovative recent methods founding an advanced Internet search application.

关键词： Search engines

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The Stability Analysis of the Adaptive Fading Extended Kalman Filter

The Stability Analysis of the Adaptive Fading Extended Kalma...

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IEEE Conference on control Technology and Applications (CCTA)

作者： Kwang Hoon Kim Jang Gyu Lee Chan Gook Park Gyu In Jee Department of Electronics Engineering Brain Korea 21 Research Group Konkuk University Seoul South Korea School of Electrical Engineering and Computer Science and Automatic Control Research Center Seoul National University Seoul South Korea School of Mechanical and Aerospace Engineering and Institute of Advanced Aerospace Technology Seoul National University Seoul South Korea Department of Electronics Engineering Konkuk University Seoul South Korea

The well-known conventional Kalman filter gives the optimal solution but requires an accurate system model and exact stochastic information. Thus, the Kalman filter with incomplete information may be degraded or even diverged. In a number of practical situations, the system model and the stochastic information are incomplete. To solve this problem, a new adaptive fading Kalman filter (AFKF) using the forgetting factor has recently been proposed. This paper extends the AFKF to nonlinear system models to obtain an adaptive fading extended Kalman filter (AFEKF). The forgetting factor is generated from the ratio between the calculated innovation covariance and the estimated innovation covariance. Based on the analysis result of Reif for the EKF, the stability of the AFEKF is also analyzed.

关键词： Stability analysis Fading Stochastic systems Nonlinear equations Nonlinear systems Information filtering Information filters Adaptive filters control systems Degradation

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The Design of humanoid Robot Arm based on Morphological and Neurological Analysis of Human Arm

The Design of humanoid Robot Arm based on Morphological and ...

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IEEE International Conference on Mechatronics and Automation

作者： Yongseon Moon Kwang Seok Lee Cheol-Ho Yun Tae-Uk Jung Nak Yong Ko Youngchul Bae School of Information Communication Sunchon National University Suncheon South Korea Gwangju research center Korea Institute of Industrial and Technology Gwangju South Korea Department of Control and Instrumentation Engineering Chosun University Gwangju South Korea Division of Electrical Electronic Communication Computer Engineering Chonnam National University Yeosu South Korea

In this paper, we analyzed and verified possibility and validity of overcoming present limitations of humanoid robot by using morphological and neurological analysis of human arm. Through design, implementation and performance evaluation of humanoid robot arm, we will be verifying applicability and effectiveness of humanoid robot arm system based on SERCOS network that fulfills the concept of opening, networking and modularizations that are progressive direction of future robot.

关键词： Humanoid robots Humans Service robots Unified modeling language Information analysis Communication industry Mechatronics Design automation Robotics and automation Moon

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The Design of humanoid Robot Arm based on Morphological and Neurological Analysis of Human Arm

The Design of humanoid Robot Arm based on Morphological and ...

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Annual Conference of Industrial Electronics Society

作者： Yongseon Moon Jinju Park Cheol-Ho Yun Nak Yong Ko Hong Sik Moon Youngchul Bae School of Information Communication Sunchon National University Suncheon South Korea Gwangju research center Korea Institute of Industrial and Technology Gwangju South Korea Department of Control and Instrumentation Engineering Chosun University Gwangju South Korea Division of Electrical-Electronic Communication Computer Engineering Chonnam National University Yeosu South Korea

In this paper, we analyzed and verified the possibility and validity of overcoming present limitations of humanoid robots by using morphological and neurological analysis of human arm. Through design, implementation and performance evaluation of humanoid robot arm, we will be verifying applicability and effectiveness of humanoid robot arm system based on SERCOS network which fulfills the concept of opening, networking and modularizations which are progressive direction of future robot. Moreover, we proposed design and analysis of a single joint module for humanoid robot.

关键词： Humanoid robots Humans Service robots Information analysis ISO standards Moon Design engineering Performance analysis Actuators Industrial Electronics Society

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Phase-remapping attack in practical quantum-key-distribution systems

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Physical Review A 2007年第3期75卷 032314-032314页

作者： Chi-Hang Fred Fung Bing Qi Kiyoshi Tamaki Hoi-Kwong Lo Center for Quantum Information and Quantum Control Department of Electrical & Computer Engineering and Department of Physics University of Toronto Toronto Ontario Canada NTT Basic Research Laboratories NTT Corporation 3-1 Morinosato Wakamiya Atsugi-Shi Kanagawa 243-0198 Japan and CREST JST Agency 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan

Quantum key distribution (QKD) can be used to generate secret keys between two distant parties. Even though QKD has been proven unconditionally secure against eavesdroppers with unlimited computation power, practical implementations of QKD may contain loopholes that may lead to the generated secret keys being compromised. In this paper, we propose a phase-remapping attack targeting two practical bidirectional QKD systems (the “plug-and-play” system and the Sagnac system). We showed that if the users of the systems are unaware of our attack, the final key shared between them can be compromised in some situations. Specifically, we showed that, in the case of the Bennett-Brassard 1984 (BB84) protocol with ideal single-photon sources, when the quantum bit error rate (QBER) is between 14.6% and 20%, our attack renders the final key insecure, whereas the same range of QBER values has been proved secure if the two users are unaware of our attack; also, we demonstrated three situations with realistic devices where positive key rates are obtained without the consideration of Trojan horse attacks but in fact no key can be distilled. We remark that our attack is feasible with only current technology. Therefore, it is very important to be aware of our attack in order to ensure absolute security. In finding our attack, we minimize the QBER over individual measurements described by a general POVM, which has some similarity with the standard quantum state discrimination problem.

关键词： UNCONDITIONAL SECURITY CRYPTOGRAPHY DISCRIMINATION PROTOCOL STATES PROOF

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Voltage Injection Based Initial Rotor Position Estimation Method for Three-Phase Star-Connected Switched Reluctance Machines

Voltage Injection Based Initial Rotor Position Estimation Me...

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2007 International Conference on Power Electronics and Drive Systems (PEDS 2007), vol.2

作者： P. Somsiri P. Champa P. Wipasuramonton K. Tungpimonrut P. Aree Department or Electrical Engineering Thammasat University Thailland Industrial Control and Automation Lab National Electronics and Computer Technology Center Thailand

This paper presents a simple method to determine the initial rotor position of a three-phase star-connected switched reluctance machine (SRM) at standstill without position and current sensors. The principle of the initial rotor position estimation is based on the stator inductance variation related to the actual rotor position. In the proposed method, only two narrow voltage pulse injections are applied in sequence. In this method the machine parameters and phase current detection are not required. The method is suitable for low-cost SRM-drive applications. The experimental results were carried out on a 6/4 poles three-phase SRM and show the satisfactory accuracy of the proposed initial rotor position estimation.

关键词： Switched reluctance motor Rotor position estimation Standstill

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