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Annual North-American Power Symposium

作者： James A. Momoh Nadir Wade Arunsi Chuku Lateef L. Baruwa Center for Energy Systems and Control CESaC Howard University College of Medicine Washington D.C. DC USA Center for Energy Systems and Control (CESaC) Howard University Washington DC USA Center for Energy Systems and Control CESaC Department of Electrical and Computer Engineering ECE Howard University College of Medicine USA Dept. of Electrical and Computer Engineering (ECE) Howard University. Air Traffic Systems Division Federal Aviation Administration (FAA) Washington DC USA

The mitigation of the impact of lightning and the individual control cabinet (ICC) protection of an approach lighting system (ALS) against over-voltage is the focus of this paper. It is the objective of this paper to evaluate three proposed ALS topologies and select the grounding configuration which optimally mitigates the high voltage and current levels caused by lightning, as well as to assess the over-voltage reduction capability of a metal-oxide varistor and its ability to provide protection to the individual control cabinet to prevent damage. Simulation of the grounding system of each ALS topology using a sensitivity study, which incorporates changes in conductor and environmental characteristics, is performed to determine the robustness of each ALS topology. Performance of a hands-on destructive test is also carried out to obtain practical results to compare with simulation results. This paper provides the foundation for improving the current ALS grounding and protective measures by updating standards and specifications to promote increased reliability and safety, as well as reduced equipment cost.

关键词： Lightning Lighting control control systems Protection Topology Grounding Varistors Optimal control Voltage control Conductors

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Design and Simulation of Ultrasonic Linear Motor using Multilayer Ceramic Actuator

Design and Simulation of Ultrasonic Linear Motor using Multi...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Juhyun Yoo Sangho Lee Jaeil Hong Hyunsun Song Durkwon Park Eunsang Hwang Department of Electrical Engineering Semyung University Chungbuk South Korea Department of Computer Science Semyung University Chungbuk South Korea Dept. of Electrical Information Control Dongseoul College Seongnam Gyeonggi 461-714 Korea Semyung University Department of Computer Science Jechon Chungbuk 390-711 Korea

In comparison with conventional electromagnetic motors, ultrasonic motors have many advantages such as a large torque at the low velocity, good controllability, rapid response, quiet operation, simple structure and non electromagnetic field induction, etc. These features have led to the development of various ultrasonic motors in many industrial fields. Hence, in this study, ultrasonic linear motor using multilayer structured ceramic actuator was designed and simulated using ANSYS of finite element method(FEM) simulator for investigating the optimum conditions of it. The ultrasonic linear motor studied in this paper was designed using the 1st longitudinal (L 1 ) and 4th bending (B 4 ) vibration. The size of ceramic actuator is 15 mm long and 5 mm wide. And one-layer thickness of actuator is 60 mu m. The dimension of linear motor is 61 times 5 times 3 mm. The sectional size of projection is 1.5 times 5 mm. The driving voltage of the motor was very low as 5 Vrms. With the increase of the number of piezoelectric ceramic layers, displacement of node was increased up to 21 layered ceramic actuator and then decreased. Maximum z displacement of node was about 7.02 mum at the 21 layered ultrasonic motor.

关键词： Nonhomogeneous media Ceramics Hydraulic actuators Electromagnetic fields Induction motors Electromagnetic induction controllability Finite element methods Voltage Piezoelectric actuators

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Data modeling for content-based support environment (C-BASE): Application on epilepsy data mining

Data modeling for content-based support environment (C-BASE)...

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17th IEEE International Conference on Data Mining Workshops, ICDM Workshops 2007

作者： Siadat, Mohammad-Reza Soltanian-Zadeh, Hamid Fotouhi, Farshad Eetemadi, Ameen Elisevich, Kost Department ofComputer Science and Engineering Oakland University Rochester MI 48309 United States Radiology Image Analysis Lab. Henry Ford Health System Detroit MI 48202 United States Control and Intelligent Proc. Center of Excellence Dept. of Elec. and Comp. Eng. Univ. of Tehran Tehran 14395-515 Iran Department of Computer Science Wayne State University Detroit MI 48202 United States Department of Neurosurgery Henry Ford Health System Detroit MI 48202 United States

ISBN: (纸本)0769530192

Data Modeling is an essential first step for data preparation in any data mining procedure. Conventional entity-relational (E-R) data modeling is lossy, irreproducible, and time-consuming especially when dealing with unstructured image data associated with complex systems like the human brain. We propose a methodological framework for more objective E-R data modeling by eliminating the structured content-dependent metadata associated with the unstructured data. The proposed method is applied to epilepsy-related image data and a system called the human brain image database system (HBIDS) is developed accordingly. Supported with navigation, segmentation, data fusion, and feature extraction modules, HBIDS provides a content-based support environment (C-BASE). Such an environment potentially provides an unlimited (ad hoc) query support with a reproducible and efficient database schema. Switching between different modalities of data, while confining the feature extractors within the object(s) of interest, HBIDS yields anatomically specific query results. The price of such scheme is large storage requirements and relatively high computational cost. Examples of navigation through unstructured image data and content-based retrieval are presented in this paper. The results show the potential of HBIDS in content-based data management for decision support systems in real life medical applications. © 2007 IEEE.

关键词： Data mining

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Sensor fusion using dynamic Bayesian networks in livestock production buildings

Sensor fusion using dynamic Bayesian networks in livestock p...

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CIMCA 2006: International Conference on Computational Intelligence for Modelling, control and Automation, Jointly with IAWTIC 2006: International Conference on Intelligent Agents Web Technologies and International Commerce

作者： Hansen, Jens A. Nielsen, Thomas D. Schiøler, Henrik Dept. of Computer Science Aalborg University Dept. of Control Engineering Aalborg University

ISBN: (纸本)0769527310

The climate in modern livestock production buildings is controlled using a simple state controller. State controllers are typically not equipped to handle abnormal situations, e.g. sensors providing false or no readings, and they may therefore produce malformed climate control signals which may have severe consequences for the livestock. To make the system more robust, a sensor fusion system can be used to combine the different sensor readings and thereby produce a more reliable estimate of the climate state. A dynamic Bayesian network (DBN) model is constructed for this purpose. The model is tested in an online setup in a climate laboratory, where realtime behavior is archived by using the Boyen & Koller approximate inference algorithm. Preliminary experimental results show that the proposed model provides a promising framework for sensor fusion in livestock buildings. © 2006 IEEE.

关键词： Sensor data fusion

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Building automata - Type simulation models for undergraduate teaching industrial systems analysis

Building automata - Type simulation models for undergraduate...

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作者： Deligiannis, Vasileios Manesis, Stamatis Electrical and Computer Engineering Dept. Division of Systems and Control University of Patras Greece

ISBN: (纸本)9783902661074

Simulation has a significant role in control engineering. It provides the best solution for educating new engineers without expensive experimentation on real systems. This paper presents a guide for constructing simulation models based on a recently presented hyper-class of hybrid automata. New type's definition is given jointly with some examples of guide's use. Guide is applicable in various programming environments and is oriented for undergraduate teaching purposes. Copyright © 2006 IFAC.

关键词： Systems analysis

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Optimal deployment of distributed passive measurement monitors

Optimal deployment of distributed passive measurement monito...

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2006 IEEE International Conference on Communications, ICC 2006

作者： Chengchen, Hu Bin, Liu Zhen, Liu Shifang, Gao Dapeng, Wu Dept. of Computer Science and Technology Tsinghua University Beijing China Dept. of Automatic Control Northwest Polytechnical University Xi'an Shaanxi China Dept. of Electrical and Computer Engineering University of Florida Gainesville FL United States

ISBN: (纸本)1424403553

Flow-level traffic measurement is important for network management. The widely used centralized per-flow measurement faces a great challenge due to the demanding requirement on both memory bandwidth and memory size within a single traffic monitor. This paper addresses the issue of deploying a Distributed Passive Measurement System (DPMS) in a large scale network;specifically, we study how to optimally place traffic monitors and sample stochastic traffic flows, so that the probability of a packet being sampled (a.k.a. measurement coverage) is maximized. We formulate this problem as a Stochastic Chance Constrained Optimization (SCCO) problem;and we propose a Hybrid Intelligent (HI) algorithm to solve this problem. The HI algorithm consists of two major components, namely, uncertain function approximation and genetic algorithm. Equipped with the HI algorithm, we are able to address the optimal tradeoff between measurement coverage and deployment cost for networks with random traffic, which has not been studied before. Our simulations and experiments demonstrate the effectiveness of our algorithm, i.e., a small deployment cost or a small number of monitors are sufficient to maintain a high level of measurement coverage. © 2006 IEEE.

关键词： Telecommunication traffic

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ATQL: Adaptive target queue length adjustment for AQM controllers to meet dynamic traffic environment

ATQL: Adaptive target queue length adjustment for AQM contro...

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1st IEEE International Conference on Wireless Broadband and Ultra Wideband Communications, AusWireless 2006

作者： Fang, Shudong Sun, Jinsheng Berber, Stevan M. Dept. of Electrical and Computer Engineering Univ. of Auckland New Zealand Dept. of Automatic control Nanjing Univ. of Sci. and Tech. China

ISBN: (纸本)0977520005

An adaptive target queue length (ATQL) adjustment algorithm proposed in this paper cooperates with certain Active Queue Management (AQM) controllers to achieve more efficient buffer management for Internet congestion control. ATQL algorithm which estimates the average traffic load and dynamically adjusts the target queue length in dynamic traffic environment can be easily embedded into a series of AQM controllers. By engaging ATQL, AQM controllers are more suited to random and unpredictable traffic scenarios. Simulations are applied to validate ATQL's ability in assisting AQM controllers in sustaining stable drop probability, minimizing unnecessary packet loss, guaranteeing the link utility and maximizing the exploitation of buffer spaces.

关键词： Queueing theory

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Fault diagnosis for induction machines using kernel principal component analysis

Fault diagnosis for induction machines using kernel principa...

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3rd International Symposium on Neural Networks, ISNN 2006 - Advances in Neural Networks

作者： Park, Jang-Hwan Lee, Dae-Jong Chun, Myung-Geun Information and Control Engineering Chungju National University Chungju Korea Republic of Dept. of Electrical and Computer Engineering Chungbuk National University Korea Republic of

ISBN: (纸本)3540344829

For the fault diagnosis of three-phase induction motors, we set up an experimental unit and then develop a diagnosis algorithm based on pattern recognition. The experimental unit consists of induction motor drive and data acquisition module to obtain the fault signals. As the first step for diagnosis procedure, preprocessing is performed to make the acquired current simplified and normalized. To simplify the input data, three-phase currents are transformed into the magnitude of Concordia vector. As the next step, feature extraction is performed by kernel PCA. Finally, we used the linear classifier based on two types of distance measures. To show the effectiveness, the proposed fault diagnostic system has been intensively tested with the various data acquired under the different electrical and mechanical faults with varying load. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Induction motors

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BUILDING AUTOMATA – TYPE SIMULATION MODELS FOR UNDERGRADUATE TEACHING INDUSTRIAL SYSTEMS ANALYSIS

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IFAC Proceedings Volumes 2006年第6期39卷 297-302页

作者： Vasileios Deligiannis Stamatis Manesis Patras Electrical & Computer Engineering Dept. Division of Systems and Control

关键词： automata modelling simulation education industrial production systems

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Trajectory planning of space robot system for target berthing and reorientation after capturing

Trajectory planning of space robot system for target berthin...

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6th World Congress on Intelligent control and Automation, WCICA 2006

作者： Wenfu, Xu Bin, Liang Wenyi, Qiang Panfeng, Huang Yangsheng, Xu Dept. of Control Science and Engineering Harbin Institute of Technology Harbin 150001 China College of Astronautics Northwestern Polytechnical University Xi'An China Dept. of Automation and Computer-Aided Engineering Chinese University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)1424403324

A typical servicing operation in space mainly includes three phases: capturing the target, berthing and docking the target, and repairing the target. The attitude of a satellite usually changes after the capturing, because the control system is turned off during this phase for safety reasons. In this paper, a method is proposed to achieve the berthing of the target and reorientating the satellite attitude at the same time, both by involving manipulator motion only. Firstly, the constraints on the manipulator and the objective function are defined according to the planning problem. Then the joint trajectory is parameterized by sinusoidal function, whose argument is the polynomial. Finally, Genetic Algorithm is used to search for the global optimal resolution of the parameters. When the parameters are found, each joint trajectory can be determined. This planned trajectory is smooth and more applicable for the control of the free-floating robotic system. Our proposed method is verified by simulation. © 2006 IEEE.

关键词： Mobile robots

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