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International Conference on Power system Technology (POWERCON)

作者： Xueping Gu Claudio A. Canizares Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Department of Electrical and Computer Engineering University of Waterloo Waterloo ONT Canada

Determining loadability margins to various security limits is of great importance for the secure operation of a power system. A novel approach is proposed in this paper for fast prediction of loadability margins with respect to small-signal stability based on neural networks. Small-signal stability boundaries are constructed by means of loading the power system until the stability limits are reached from a base operating point along various loading directions. Back-propagation neural networks (BPNN) for different contingencies are trained to approximate these stability boundaries. A search algorithm is then proposed to predict the loadability margins from any stable operating point along arbitrary loading directions through an iterative technique based on the trained BPNNs. The simulation results for the IEEE two-area benchmark system demonstrate the effectiveness of the proposed method for on-line prediction of loadability margins.

关键词： Neural networks Power system stability Power system security Voltage Power system simulation Monitoring National security control systems Operating systems Bifurcation

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Design of a Humanoid Robot Eye: Models and Experiments

Design of a Humanoid Robot Eye: Models and Experiments

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IEEE-RAS International Conference on Humanoid Robots

作者： Giorgio Cannata Mirko D'Andrea Marco Maggiali Dept. of Communications Computer and System Sciences University of Genova Genova Italy Consiglio Nazionale delle Ricerche Area di Ricerca di Napoli 1 Napoli Campania IT Mechatronics and Automatic Control Laboratory University of Genova Genova Italy

ISBN: (纸本)1424401992;142440200X

Eye movements have the goal of optimizing visual perception, therefore the investigation of eye motion strategies play an important role in the design of humanoid robot eye systems. Saccades in humans and primates is a significant class of ocular motions, which obey the so called Listing's Law, which constrains the admissible eye's angular velocities and ensure zero torsion during motion. In this paper we present a model of the eye plant proving that listing's law implementation is strongly related with the geometry of the eye and its actuation system (extraocular muscles). The proposed model has been used to provide the guidelines for the design of a tendon driven humanoid robot eye. Experimental tests, presented in this paper, validate the model by performing a quantitative comparison of the performance of the robot eye with physiological data measured in humans and primates during saccades

关键词： Humanoid robots Humans Design optimization Visual perception Angular velocity Solid modeling Computational geometry Muscles Guidelines Tendons

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Hippocampus Volume and Texture Analysis for Temporal Lobe Epilepsy

Hippocampus Volume and Texture Analysis for Temporal Lobe Ep...

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IEEE International Conference on Electro-Information Technology

作者： Kourosh Jafari-Khouzani Hamid Soltanian-Zadeh Kost Elisevich Henry Ford Health System Radiology Image Analysis Laboratory Detroit MI USA Department of Computer Science Wayne State University Detroit MI USA Control and Intelligent Processing Center of Excellence ECE Department University of Tehran Tehran Iran Neurosurgery Department Henry Ford Health System Detroit MI USA

It has been previously shown that intensity and volume features of the hippocampus from MR images of the brain are useful in detecting the abnormality and consequently candidacy of the hippocampus for temporal lobe epilepsy (TLE) surgery. In this paper, we have studied and compared volume and texture features of hippocampus for TLE lateralization. Volume and some features describing the intensity non-uniformities are used. We use manual segmentation of the hippocampi from T1 weighted images and map them to the FLAIR images. Wavelet features as well as mean and variance of the hippocampus intensities of the FLAIR slices are used as texture features. A dataset of 55 patients with 28 right and 27 left abnormal sides was used in the experiments. Experimental results show that the volume and intensity features are useful in determining the abnormal side

关键词： Hippocampus Temporal lobe Epilepsy Image texture analysis Image segmentation Image analysis Shape Surgery Wavelet packets Radiology

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High SNR flexible top hat monopole probe for 1.5 T MRI

High SNR flexible top hat monopole probe for 1.5 T MRI

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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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Estimation of dynamic origin destination matrix of traffic systems

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Periodica Polytechnica Transportation Engineering 2005年第1-2期33卷 3-14页

作者： Kulcsár, Balázs Bécsi, Tamás Varga, István Department of Control and Transport Automation Budapest University of Technology and Economics Bertalan L. u. 2 H-1111 Budapest Hungary System and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H-1111 Budapest Hungary

The paper suggests the necessity of the estimation of unmeasured variables of traffic systems. The presented method proposes constrained state estimation of unmeasured traffic variable such as turning rates. The weighted constrained state approach uses moving horizon along the state trajectory which permits to handle equality and inequality constraints belonging to the nature of the traffic model. A numerical example illustrates the importance of constrained estimation.

关键词： Transportation

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An embedded tactile and force sensor for robotic manipulation and grasping

An embedded tactile and force sensor for robotic manipulatio...

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IEEE-RAS International Conference on Humanoid Robots

作者： G. Cannata M. Maggiali Mechatronics and Automatic Control Laboratory Department of Communications Computer and System Sciences University of Genoa Genoa Italy

A new fully embedded tactile/force sensor system is presented. The sensor has been designed to be installed on a dextrous robot gripper (MAC-HAND). The tactile sensor consists of a matrix of 64 electrodes, etched on a flexible PCB covered by a conductive rubber layer. The force sensor is an off-the-shelf integrated three components micro-joystick. The analog and digital electronics is fully embedded with the sensor that is a self-standing module mounted on each finger phalange

关键词： Force sensors Robot sensing systems Grippers Fingers Tendons Tactile sensors Mechanical sensors Sensor systems Torque Mechanical variables measurement

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Modelling and optimal digital tracker for analog neutral delay systems

Modelling and optimal digital tracker for analog neutral del...

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7th IASTED International Conference on control and Applications, CA 2005

作者： Tsai, Tzong J. Tsai, Jason S. H. Guo, Shu M. Chen, Guanrong Control System Laboratory Department of Electrical Engineering National Cheng Kung University Tainan 701 Taiwan Department of Computer Science and Information Engineering National Cheng Kung University Tainan 701 Taiwan Department of Electronic and Engineering City University of Hong Kong Kowloon Hong Kong

ISBN: (纸本)0889865027

This paper presents a new, practical, and realizable methodology and scheme for an optimal hybrid tracking control problem for continuous neutral time-delay system. A continuous-time linear quadratic cost function that has a high-gain property is used for tracking control specification. Two interpolation formulas together with an extended state vector are applied to directly convert the original analog optimal tracking problem into an equivalent digital optimal regulator problem. Then, using the discrete-time optimal control theory and an indirect digital redesign technique with a predictive feature, an effective low-gain digital tracker, without losing the pre-specified high-quality performance in the continuous domain, is designed for the original analog neutral time-delay system.

关键词： control system analysis

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Unknown Input Detection Using Receding Horizon Approach

Unknown Input Detection Using Receding Horizon Approach

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IEEE International Symposium on Intelligent control (ISIC)

作者： B. Kulcsar J. Bokor Department of Transport Automation Faculty of Transportation Engineering Budapest University슠of슠Technology슠and슠Economics Budapest Hungary System and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

The paper offers the possibility of the design of unknown input detection for dynamic systems under external noise effect. The presented geometric based fundamental problem in residual generation (FPRG) method uses on the one hand the Kalman filtering and on the other hand the moving horizon estimation (MHE) when stochastic noise on the input and on the output, with additive failure directions, are presents. The paper combines the optimal Kalman and MHE method with geometric based unknown input observer strategy. The MHE solution makes to treat constraints during the estimation process possible. A numerical example supports the necessity of constrained unknown input estimation

关键词： Fault detection State estimation control systems Kalman filters Space technology Additive noise Automation Stability Predictive models Predictive control

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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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Towards new real-time processor: The multioperand MSB-first real-time adder

Towards new real-time processor: The multioperand MSB-first ...

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Proceedings of the EUROMICRO systems on Digital system Design, DSD 2004

作者： Kuspriyanto Kerlooza, Yusrila Y. Lab. of Computer and Control System Dept. of Electrical Engineering Bandung Institute of Technology Hardware Laboratory Dept. of Computer Engineering Indonesian Computer University

ISBN: (纸本)0769522033

Arithmetic operation's execution time in real-time system is bounded by deadlines. The method commonly used to meet these deadlines is by employing any suitable process-scheduling algorithm, which may contain a potential weakness. If time needed to operate is longer than its deadline, then the result's quality will be poor. This is mainly caused by the algorithms of the arithmetic operations commonly used nowadays do not choose the most significant data to be processed first. This research tries to design new algorithm and its processing unit that works based on real-time principles, which starts its computation process from the highest valued digit and provides its intermediate-results that can be accessed anytime during the process. Designing tool used in this research is MAX+plus II Baseline 10.2 software. This research accomplishes in showing the performance of the new algorithm and its processing unit, which is better than the performance of the conventional algorithm.

关键词： Real time systems

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