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International Conference on Magnetics (INTERMAG)

作者： M. Oka M. Enokizono Department of computer and Control Engineering Oita National College of Technology Oita Japan Faculty of Engineering Oita University Oita Japan

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Interoperability issues in sharing electronic healthcare records-the Synapses approach

Interoperability issues in sharing electronic healthcare rec...

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IEEE International Conference on engineering of Complex computer Systems

作者： J. Grimson E. Felton G. Stephens W. Grimson D. Berry Department of Computer Science Trinity College Dublin Dublin Ireland School of Control Systems and Electrical Engineering Dublin Institute of Technology Ireland

This paper describes the approach to information sharing being adopted by Synapses, a pan-European project funded under the EU Health Telematics Programme. The emphasis in Synapses is on developing standards to enable sharing, in whole or in part, of electronic healthcare records between distributed healthcare providers and institutions. The current technological solutions available for data sharing, including federated database systems, gateways, data warehousing, messaging and the web are insufficient on their own to meet the needs of Synapses. Thus in Synapses several different, but complementary technologies are merged in an open, distributed object-oriented environment. Furthermore, in order to safeguard the legal, ethical and clinical integrity of the record, it is essential not only to preserve the meaning of the data being transferred, but also its context and structure. Synapses solves this problem by defining a standard architecture for the federated electronic healthcare record.

关键词： Medical services Database systems Standards development Warehousing computer science Educational institutions control systems Telematics Law Legal factors

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Robust control of cupola iron furnaces

Robust control of cupola iron furnaces

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American control Conference (ACC)

作者： M.A. Abdelrahman K.L. Moore Electrical and Computer Engineering Department Tennessee Technological University Cookeville TN USA Measurement and Control Engineering Research Center Idaho State University College of Engineering Pocatello ID USA

We present the results of a continuing effort towards the introduction of automatic control to the operation of cupola iron furnaces. The cupola furnace has played an important role in the foundry industry since its invention in 1794. The main aim of this research is to improve the operational efficiency and performance of the cupola furnace. A lumped model for the cupola is used for the controller design. The controller is divided into three parts. A feedforward controller is used to decouple the model into delayed and undelayed dynamics. A robust controller is designed for the delayed dynamics of the model based upon a combination of H/sub /spl infin// control and a Smith predictor. The controller for the undelayed portion of the model is designed using an LQR procedure.

关键词： Robust control Iron Furnaces Foundries Temperature control Delay Electric variables measurement control engineering Educational institutions Automatic control

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Developing a prototype concurrent design tool for composite topside structures

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 279-290页

作者： Dirlik, S Hambric, S Azarm, S Marquardt, M Hellman, A Bartlett, S Castelli, V Steve Dirlik:began his career at the Naval Surface Warfare Center Carderock Division in 1981 as an aerospace engineer co-op student. He completed his bachelor of science degree in aeropace and ocean engineering from Virginia Polytechnic Institute and State University in 1985 and his master of science degree in aerospace engineering from the University of Maryland in 1990. Mr. Dirlik recently completed a master of science program in applied physics at The Johns Hopins University and currently works in the Radar Cross Section and Target Physics Branch of the Signatures Directorate at the Naval Surface Warfare Center Corderoke Division. He has worked on Navy low observable programs since 1990. Stephen Hambric:is a research associate at the Applied Research Laboratory at The Pennsylvania State University. He received his B. S. and M.S. degree in mechanical engineering from Virginia Polytechnic Institute and State University and his D. Sc. in mechnical engineering from the George Washington University. He has worked on several computer aided multidiscikplinary design and optimization projects over the years including an automated propeller design system and a structural acoustic optimization capability. Dr. Shpour Azarm:is currently working as an associate professor with the Design and Manufacturing Group of the Department of Mechanical Engineering at the University of maryland at College Park. Dr Azarm's expertise is in the areas of optimization-based designed and concurrent design and optimization of multidisciplinary systems. He was a consultant at Black & Decker Corporation (summer 1996) and worked as a Navy senior summer faculty fellow (summer 1995) and a NASA summer faculty fellow (summer 1994). He was a visiting scientist at NASA Langley Research Center for Multidisciplinary Analysis and Applied Structural Optimzatiom at the University of Siegen in Germany (spring 1992) and the Design Institute of the Technical University of Denmark (summer 1990). Dr Azarm was an associate technical editor of the ASME Jour

A prototype concurrent engineering tool has been developed for the preliminary design of composite topside structures for modern navy warships. This tool, named GELS for the Concurrent engineering of Layered Structures, provides designers with an immediate assessment of the impacts of their decisions on several disciplines which are important to the performance of a modern naval topside structure, including electromagnetic interference effects (EMI), radar cross section (RCS), structural integrity, cost, and weight. Preliminary analysis modules in each of these disciplines are integrated to operate from a common set of design variables and a common materials database. Performance in each discipline and an overall fitness function for the concept are then evaluated. A graphical user interface (GUI) is used to define requirements and to display the results from the technical analysis modules. Optimization techniques, including feasible sequential quadratic programming (FSQP) and exhaustive search are used to modify the design variables to satisfy all requirements simultaneously. The development of this tool, the technical modules, and their integration are discussed noting the decisions and compromises required to develop and integrate the modules into a prototype conceptual design tool.

关键词： Warships

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Induction motor servo system using variable structure control with fuzzy sliding surface

Induction motor servo system using variable structure contro...

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International Conference on Industrial Electronics, control and Instrumentation

作者： Duk-Heon Kim Hack-Seong Kim Jae-Mun Kim Chung-Yuen Won Sei-Chan Kim Department of Electrical Sang Ji Technical College Luxembourg Department of Electrical Engineering SungKyunKwan University Suwon Kyunggi South Korea Department of Computer Control Bu Cheon Technical College South Korea

ISBN: (纸本)0780327756

Sliding mode control has been widely used in induction motor servo drives. It provides attractive features such as fast dynamic response, insensitivity to variations in plant parameters and external disturbance. However, one difficult problem, which has meant that the sliding mode controlled servo system has not yet become popular, is due to chattering. This paper presents a new fuzzy-sliding mode controller for a vector-controlled induction motor servo system not only to guarantee the stability of the system but to practically eliminate the chattering problem. The performance of the proposed system is compared with that of traditional sliding mode control and sliding mode control with boundary layer method.

关键词： Induction motors Servomechanisms control systems Fuzzy control Fuzzy systems Sliding mode control Electric variables control Educational institutions Stability Robustness

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Phase stabilization of reference signals in analog fiber-optic links

Phase stabilization of reference signals in analog fiber-opt...

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International Topical Meeting on Microwave Photonics (MWP)

作者： M. Shadaram V. Gonzalez J. Ceniceros N. Shah J. Mayers S. Pappert D. Lafaw Electrical and Computer Engineering Department University of Texas El Paso El Paso TX USA Control and Ocean Survedhce Center Research Development Test & Evaluation Division Naval Command San Diego CA USA Laboratory of Physical Science College Park MD USA

A feedback technique that utilizes a special optical modulator is used to reduce the phase noise of RF signals in microwave fiber-optic links. Experimental results indicate a reduction in the phase noise of a 150 MHz ... 详细信息

关键词： Phase noise Frequency Optical receivers Optical feedback Optical modulation Optical noise Phase modulation Optical transmitters Phase detection Optical sensors

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Roles of neural and evolutionary computing in intelligent software systems

British Telecom technology journal

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British Telecom technology journal 1996年第4期14卷 46-54页

作者： Tsui, K.C. Azvine, B. Plumbley, M. Hong Kong Polytechnic University of Essex Kings College University of London BT Laboratories Manchester University Dynamics and Control Research Group Engineering Department Manchester University Contr. and Instrum. Research Group Staffordshire University Intelligent Systems Research Group Churchill College Cambridge United Kingdom Thorn-EMI Ctrl. Res. Laboratories Cambridge Univ. Eng. Department Centre for Neural Networks King's College London Department of Computer Science Electron. and Electrical Engineering King's College London United Kingdom European Neural Network Society

This paper describes two computing paradigms known as neural computing and evolutionary computing, and their potential contribution to building intelligent software systems. The paper begins by giving a brief introduction to the origins of each paradigm. Then two sections introduce the basic principles, and identify the role of each paradigm in intelligent system design. Each section ends with a number of applications that have been or are being investigated. These include connection admission control, modem communication, adaptive model-based control, face and handwriting recognition, frequency assignment, help-desk scheduling, financial time-series prediction, face recognition and evolving agent behavior. A section introduces the idea of using communications theory to design neural networks and the paper concludes with the authors' views on the future of neural and evolutionary computing for intelligent software systems.

关键词： Artificial intelligence

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Accurate global positioning via fuzzy logic Kalman filter-based sensor fusion technique

Accurate global positioning via fuzzy logic Kalman filter-ba...

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International Conference on Industrial Electronics, control and Instrumentation

作者： K. Kobayashi K.C. Cheok K. Watanabe F. Munekata School of Engineering and Computer Science Oakland University Rochester MI USA Instrument and Control Engineering Department College of Engineering Hosei University Koganei Tokyo Japan

The ability to determine accurate global position of a vehicle has many useful commercial and military applications. Differential Global Positioning System (DGPS) is one of the practical navigation tools used for this purpose. However, DGPS has limitations arising from slow updates, signal interference and limited accuracy. This paper describes how vehicle rate sensors can be used to help a DGPS overcome these limitations. The theoretical background for the sensor fusion is based on the principle of Kalman filtering and a fuzzy logic scheme. Validity of the method was examined by using experimental data from an actual automobile navigating around an urban area. The results demonstrated that the path of the automobile can be continuously traced with high accuracy and repeatability.

关键词： Fuzzy logic Kalman filters Global Positioning System Vehicles Navigation Automobiles Interference Sensor phenomena and characterization Sensor fusion Filtering

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Estimation of absolute vehicle speed using fuzzy logic rule-based Kalman filter

Estimation of absolute vehicle speed using fuzzy logic rule-...

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American control Conference (ACC)

作者： K. Kobayashi K.C. Cheok K. Watanabe School of Engineering and Computer Science Oakland University Rochester MI USA Instrument and Control Engineering Department College of Engineering Hosei University Koganei Tokyo Japan

Accurate knowledge on the absolute or true speed of a vehicle, if and when available, can be used to enhance advanced vehicle dynamics control systems such as anti-lock brake systems (ABS) and auto-traction systems (ATS) control schemes. Current conventional method uses wheel speed measurements to estimate the speed of the vehicle. As a result, indication of the vehicle speed becomes erroneous and, thus, unreliable when large slips occur between the wheels and terrain. This paper describes a fuzzy rule-based Kalman filtering technique which employs an additional accelerometer to complement the wheel-based speed sensor, and produce an accurate estimation of the true speed of a vehicle. We use the Kalman filters to deal with the noise and uncertainties in the speed and acceleration models, and fuzzy logic to tune the covariances and reset the initialization of the filter according to slip conditions detected and measurement-estimation condition. Experiments were conducted using an actual vehicle to verify the proposed strategy.

关键词： Fuzzy logic control systems Wheels Velocity measurement Accelerometers Vehicle dynamics Kalman filters Filtering Sensor phenomena and characterization Acceleration

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First passage risk-sensitive criterion for stochastic evolutions

First passage risk-sensitive criterion for stochastic evolut...

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American control Conference (ACC)

作者： C.D. Charalambous J.L. Hibey Measurement and Control Engineering Research Center College of Engineering Idaho State University Pocatello ID USA Department of Electrical and Computer Engineering Old Dominion University Norfolk VA USA

The purpose of this paper is to investigate in an infinite dimensional space, the first passage problem with a risk-sensitive performance criterion, and to illustrate the asymptotic behavior of the associated value function, as related to differential games arising in robust control theory. The model of interest is described by a controlled stochastic evolution with small Wiener noise intensity. The Wiener and state processes take values in infinite dimensional Hilbert spaces. The objective is to control the evolution of the state process, so as to keep it in some compact set G. By using a logarithmic transformation, it is shown that in the limit as the small noise parameter, /spl epsiv//spl rarr/0, the risk-sensitive value function converges to the value of a deterministic differential game. In the limit as the risk parameter, /spl theta//spl rarr/0, the risk-sensitive value function converges to the value function corresponding to the mean escape time problem. In addition, a lower bound on the first escape time is derived which is slightly different from the known bound for finite dimensional systems. The magnitude of the lower bound derived here, increases as /spl theta/ increases, thus robustness is achieved.

关键词： Stochastic processes Hilbert space Equations Electric variables measurement control engineering Educational institutions Game theory Robust control Stochastic resonance Robustness

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