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13th European Signal Processing Conference, EUSIPCO 2005

作者： Duan, Zhisheng Zhang, Jingxin Zhang, Cishen Mosca, Edoardo State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering Science Peking University Beijing 100871 China Department of Electrical and Computer Systems Engineering Monash University Claydon VIC 3800 Australia School of Electrical and Electronic Engineering Nanyang Technological University Singapore Singapore Dipartimento di Sistemi e Informatica Universitá di Firenze Italy

ISBN: (纸本)1604238216

The model matching problem minR(z)W(z)-R(z)E(z) involved in multirate filter banks design is addressed. A method is presented to design the synthesis filter bank R(z) with the order of W(z) which is the polyphase representation of the time delay of the reconstructed signal. The existence conditions of such low-order R(z) are given in linear matrix inequalities (LMIs). The corresponding H2 model matching problem is solved in the same fashion. The results are illustrated through examples. Examples demonstrate the possibility of improving signal reconstruction error and reducing the order of synthesis filters simultaneously by increasing moderately time delay.

关键词： Time delay

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Body tracking in human walk from monocular video sequences

Body tracking in human walk from monocular video sequences

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Canadian Conference on computer and Robot Vision, CRV

作者： F. Jean R. Bergevin A.B. Albu Computer Vision and Systems Laboratory (CVSL) Department of Electrical and Computer Engineering Laval University Sainte-Foy QUE Canada

This paper proposes a method to automatically track human body parts in the context of gait modelisation and recognition. The proposed approach is based on a five points human model (head, hands, and feet) where the points are detected and tracked independently. Tracking is fully automatic (no manual initialization of the five points) since it will be used in a real-time surveillance system. Feet are detected in each frame by first finding the space between the legs in the human silhouette. The issue of feet self-occlusion is handled using optical flow and motion correspondence. Skin color segmentation is used to find hands in each frame and tracking is achieved by using a bounding box overlap algorithm. The head is defined as the mass center of a region of the upper silhouette.

关键词： Video sequences Biological system modeling Humans Surveillance Image motion analysis Cameras Legged locomotion computer vision Biomedical optical imaging Optical variables control

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Smart archive: a component-based data mining application framework

Smart archive: a component-based data mining application fra...

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International Conference on Intelligent systems Design and Applications (ISDA)

作者： P. Laurinen L. Tuovinen J. Roning Intelligent Systems Group Computer Engineering Laboratory Department of Electrical and Information Engineering University of Oulu Finland

Implementation of data mining applications is a challenging and complicated task, and the applications are often built from scratch. In this paper, a component-based application framework, called smart archive (SA) designed for implementing data mining applications, is presented. SA provides functionality common to most data mining applications and components for utilizing history information. Using SA, it is possible to build high-quality applications with shorter development times by configuring the framework to process application-specific data. The architecture, the components, the implementation and the design principles of the framework are presented. The advantages of a framework-based implementation are demonstrated by presenting a case study which compares the framework approach to implementing a real-world application with the option of building an equivalent application from scratch. In conclusion, the paper presents a lucid framework for creating data mining applications and illustrates the importance and advantages of using the presented approach.

关键词： Data mining Application software Delta modulation computer architecture Decision support systems Software architecture Intelligent systems Algorithm design and analysis systems engineering and theory Laboratories

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"Wireless" control of spatially distributed power electronics

"Wireless" control of spatially distributed power electronic...

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Annual IEEE Conference on Applied Power Electronics Conference and Exposition (APEC)

作者： S.K. Mazumder K. Acharya M. Tahir Laboratory of Energy and Switching Electrmics Systems Department of Electrical and Computer Engineering University of Illinois Chicago IL USA Laboratory of Energy and Switching Electmics Systems Department of Electrical and Computer Engineering University of Illinois Chicago IL USA

We propose a wireless control technique for spatially distributed power electronic systems and demonstrate its applicability for master-slave control of two parallel converters, namely a two-module parallel buck converter and a two-module parallel single-phase voltage source inverter. This scheme uses radiofrequency based communication to eliminate the need for multiple physical connections among the various modules of the parallel converters and is expected to lead to simpler and redundant design of distributed power systems that is achievable using the droop method, while maintaining load sharing among the various modules. The proposed method can also be used as a backup for wire-based control of parallel converters, in applications where fault tolerance is of critical importance

关键词： Distributed control Power electronics Communication system control Voltage control Control systems Master-slave Buck converters Inverters Radio frequency Power system faults

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Simulation of a LV power distribution cable as communication medium - a finite element approach

Simulation of a LV power distribution cable as communication...

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Power Tech Conference

作者： G. T. Andreou D. P. Labridis Power Systems Laboratory of the Department of Electrical & Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece

Many models proposed in the literature to describe Low Voltage power distribution networks in consumer premises as communication media require knowledge of the electrical parameters of the cables comprising these networks. These parameters are nevertheless affected by a large number of factors which may vary greatly from case to case, making it thus very difficult to achieve an exact estimation about them. In this work a finite element approach is used for the simulation of a power distribution cable as communication medium, and the operational series impedance per unit length of a widely used cable type is derived. Moreover, the variation of the cable's operational series impedance versus current frequency, cable distance from earth and earth resistivity is presented.

关键词： Power distribution Power cables Communication cables Finite element methods Impedance Earth Low voltage Power systems Frequency Conductivity

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Inference with minimal communication: a decision-theoretic variational approach 05

Inference with minimal communication: a decision-theoretic v...

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Proceedings of the 19th International Conference on Neural Information Processing systems

作者： O. Patrick Kreidl Alan S. Willsky Department of Electrical Engineering and Computer Science MIT Laboratory for Information and Decision Systems Cambridge MA

Given a directed graphical model with binary-valued hidden nodes and real-valued noisy observations, consider deciding upon the maximum a-posteriori (MAP) or the maximum posterior-marginal (MPM) assignment under the restriction that each node broadcasts only to its children exactly one single-bit message. We present a variational formulation, viewing the processing rules local to all nodes as degrees-of-freedom, that minimizes the loss in expected (MAP or MPM) performance subject to such online communication constraints. The approach leads to a novel message-passing algorithm to be executed offline, or before observations are realized, which mitigates the performance loss by iteratively coupling all rules in a manner implicitly driven by global statistics. We also provide (i) illustrative examples, (ii) assumptions that guarantee convergence and efficiency and (iii) connections to active research areas.

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Comet: a scalable coordination space for decentralized distributed environments

Comet: a scalable coordination space for decentralized distr...

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International Workshop on Hot Topics in Peer-to-Peer systems

作者： Zhen Li M. Parashar Applied Software Systems Laboratory Department of Electrical and Computer Engineering Rutgers University NJ USA

The scale, heterogeneity, and dynamism of emerging distributed and decentralized environments make coordination a significant and challenging problem. In this paper we present Comet, a scalable peer-to-peer content-based coordination space. Comet provides a global virtual shared-space that can be associatively accessed by all peer nodes in the system, and access is independent of the physical location of the tuples or identifiers of the host. Dynamically constructed, transient coordination spaces are also supported to enable context locality to be explicitly exploited for improving system performance. The design, implementation, and experimental evaluation of Comet using the PlanetLab platform are presented.

关键词： Peer to peer computing Distributed computing Context Software systems System performance Disaster management Runtime Management information systems Grid computing Pervasive computing

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Equivalent resistivity approximation of two-layer earth structures for earth return impedance calculations

Equivalent resistivity approximation of two-layer earth stru...

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Power Tech Conference

作者： D. A. Tsiamitros G. K. Papagiannis P. S. Dokopoulos Department of Electrical & Computer Engineering Power Systems Laboratory Aristotle University of Thessaloniki Thessaloniki Greece

The equivalence conditions between homogeneous and two-layer earth structures are investigated in this paper. The analysis is based on the comparison between the two-layer and the homogeneous earth return impedance relations. The aim is the derivation of a new simple formula to connect the homogeneous earth equivalent resistivity with the two-layer earth electromagnetic and geometric properties. Thus, the relatively simple expressions for the impedance calculation of the homogeneous earth case can be used for two-layer earth models. The new formula is implemented for six actual cases of two-layer earth models. The two-layer earth impedances are calculated for various configurations, including overhead transmission lines, underground cable systems and a combination of overhead line and underground conductor. The calculated impedances are compared to the corresponding for the homogeneous earth, using the equivalent resistivity given by the new formula.

关键词： Earth Impedance Conductors Cables Permeability Power transmission lines Power system modeling Permittivity Conductivity measurement Soil

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DYNAMIC GAIT PATTERN GENERATION WITH REINFORCEMENT LEARNING

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IFAC Proceedings Volumes 2005年第1期38卷 151-156页

作者： Mustafa Suphi Erden Kemal Leblebicioĝlu Department of Electrical & Electronics Engineering Computer Vision and Intelligent Systems Research Laboratory Middle East Technical University 06531 Ankara Turkey

This paper presents the gait pattern generation work performed for the six-legged robot EA308 developed in our laboratory. The aim is to achieve a dynamically developing gait pattern generation structure using reinforcement learning. For the six legged robot a simplified simulative model is constructed. The algorithm constructs a radial basis function neural network (RBFNN) to command proper leg configurations to the simulative robot. The weights of the RBFNN are learned using reinforcement learning. The developed structure succeeded in learning gait patterns compatible with different speeds of the robot.

关键词： Six-legged robot walking gait pattern reinforcement learning radial basis function neural network

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A neural network based Wide Area Monitor for a power system

A neural network based Wide Area Monitor for a power system

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2005 IEEE Power engineering Society General Meeting

作者： Li, Xiaomeng Venayagamoorthy, Ganesh K. IEEE Real-Time Power and Intelligent Systems Laboratory University of Missouri Rolla MO 65409 United States Department of Electrical and Computer Engineering University of Missouri Rolla United States South African Institute of Electrical Engineers IEEE St. Louis Computational Intelligence Department of Task Force on Intelligent Control Systems Secretary of the Intelligent Systems Subcommittee IEEE Power Engineering Society

ISBN: (纸本)078039156X

With the deregulation of power industry, many tie lines between control areas are driven to operate near their maximum capacity, especially those serving heavy load centers. Wide area controllers (WACs) using wide-area or global signals can provide remote auxiliary control signals to local controllers such as automatic voltage regulators, power system stabilizers, etc to damp out inter-area oscillations. The power system is highly nonlinear system with fast changing dynamics. In order to have an efficient WAC, an online system monitor/predictor is required to provide inter-area information to the WAC from time to time. This paper presents the design of an online Wide Area Monitor (WAM) using a neural network called the Wide Area Neuroidentifier (WANI). The WANI is used to predict ahead the speed deviations of generators in the different areas using phasor measurement unit (PMU). Results are presented to show the effectiveness of the wide area monitor for different disturbances. © 2005 IEEE.

关键词： Wide area networks

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