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High performnace speed control of interior permanent magnet synchoronous motors with maximum power factor operation

High performnace speed control of interior permanent magnet ...

引用

2003 10th IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2003

作者： Fazai, Reza Jalili-Kharaajoo, Mahdi Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran P.O. Box 14395/515 Tehran Iran

ISBN: (纸本)0780381637

In this paper, a high performance control applied to speed control of interior permanent magnet synchronous motors. The design strategy is performed with constraint on the power factor, i.e., the power factor is maximized. In order to enhance the performance of the control system, a decoupling current vector control strategy is developed to ensure high performance operation. Simulation results reveal the effectiveness of the proposed controller. © 2003 IEEE.

关键词： Speed control

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An optimization framework for dynamic, distributed real-time systems

An optimization framework for dynamic, distributed real-time...

引用

International Parallel and Distributed Processing Symposium, IPDPS 2003

作者： Ecker, Klaus Juedes, David Welch, Lonnie Chelberg, David Bruggeman, Carl Drews, Frank Fleeman, David Parrott, David Pfarr, Barbara Department of Computer Science Technical University of Clausthal Clausthal-Zellerfeld38678 Germany Center for Intelligent Distributed and Dependable Systems School of Electrical Engineering and Computer Science Ohio University AthensOH45701 United States Real-Time Software Engineering Branch NASA Goddard Space Flight Center BaltimoreMD20771 United States

ISBN: (纸本)0769519261

The paper presents a model that is useful for developing resource allocation algorithms for distributed real-time systems that operate in dynamic environments. Interesting aspects of the model include dynamic environments, utility and service levels, which provide a means for graceful degradation in resource-constrained situations and support optimization of the allocation of resources. The paper also provides an allocation algorithm that illustrates how to use the model for producing feasible, optimal resource allocations. © 2003 IEEE.

关键词： Constrained optimization

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Experiments in automatic programming for general purposes

Experiments in automatic programming for general purposes

引用

International Conference on Tools for Artificial Intelligence (ICTAI)

作者： M. Reformat Chai Xinwei J. Miller Software Technology Engineering and Measurement research center Department of Electrical and Computer Engineering University of Alberta AB Canada

Although the generation and application of software clones is relatively unexplored, it is believed that this is a fundamental technology that can have many different applications within a software engineering environment. For example, software clones could be used in software fault tolerance. Clearly, for these clones to be usable, their production needs to be automated. An interesting approach to this automatic production or generation problem is the application of evolutionary-based genetic programming (GP). Using the paradigms of best fit, selection, crossover and mutation a number of clones, satisfying specific requirements, can be automatically generated. In general, GP is a flexible and powerful algorithm suitable for solving variety of different problems. The paper presents the results of studies that have been conducted in order to answer questions related to feasibility of using GP for clone generation: what features of GP are important? What works and what does not? How GP can be "tuned" for the problem? The results have been used to draw a set of suggestions and conclusions that indicate possible usability of GP-based approach to automatic generation of clones.

关键词： Automatic programming Cloning Genetic programming Application software Production software engineering computer industry Costs Electric variables measurement software measurement

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Synthesizing distributed controllers for the safe operation of ConnectedSpaces

Synthesizing distributed controllers for the safe operation ...

引用

作者： Sridharan, Baskar Mathur, Aditya P. Cai, Kai-Yuan Software Engineering Research Center Department of Computer Sciences Purdue University West Lafayette IN 47907 United States Department of Automatic Control Beijing University of Aeronautics and Astronautics Beijing 100083 China

A collection of one or more devices, each described by its Digital Device Manual and reachable over a network, is a ConnectedSpace. A set of safety policies may be enforced on a ConnectedSpace to ensure the safety of the environment in which the ConnectedSpace is deployed. The enforcement of these safety policies by one or more safety controllers governs the behavior of the devices within the ConnectedSpace. We propose a policy-based partitioning scheme for synthesizing k distributed safety controllers such that (a) each device is guaranteed to be controlled by no more than two controllers, and (b) each policy is guaranteed to be enforced by exactly one controller. We present an experimental evaluation of our scheme. The experimental results show that the scheme is scalable with respect to the number of devices and the number of policies. We also show how safety controllers, that are correct with respect to the policies, are synthesized using the theory of supervisory control. © 2003 IEEE.

关键词： Digital devices

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Sliding mode control applied to motion control of linear structural systems under earthquake excitation 3

Sliding mode control applied to motion control of linear str...

引用

3rd IFAC Workshop on Automatic Systems for Building the Infrastructure in Developing Countries, DECOM-TT 2003

作者： Jalili-Kharaajoo, Mahdi Feizi-Khankandi, Siamak Gholami, Arash Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran P.O. Box 14395/515 Tehran Iran Civil Engineering Dep. University of Tehran P.O. Box 14395/525 Tehran Iran

For dynamical systems expressed in state-space form or for systems with non-classical damping, the reduction of the structural model into the modal co-ordinales involves complex modal analysis with complex modal co-ordinates. In this paper, application of sliding mode control for vibration control of a linear structural system under earthquake excitation is investigated. The proposed controller is applied to a three-storey building structure and the motion of the floors under El-Centro earthquake is investigated. Simulation results show that using the proposed sliding mode controller the displacement of the floors is decreased significantly. This controller can be similarly applied for higher order building. Copyright © 2003 IFAC.

关键词： Floors

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A new joint channel estimation and detection algorithm for MIMO channels

A new joint channel estimation and detection algorithm for M...

引用

Asia-Pacific Conference on Communications

作者： E. Karami M. Shiva Center of Excellence on Applied Electromagnetic Systems Department of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran

In this paper, a new joint channel estimation and detection algorithm for frequency selective fading multiple-input multiple-output (MIMO) channels is proposed. In the channel estimation section, using a generalized form of least square (LS) algorithm, a very accurate estimate of channel parameters is obtained. The procedure of detection is done in two stages. In the first stage the inter-symbol-interference (ISI) of previous stages is subtracted and then in the second stage, using a joint detection algorithm, the transmitted symbols are estimated. Parallel-interference-cancellator (PIC) and minimum-mean-square-estimator (MMSE) are used as MIMO detectors. The efficiency of the proposed algorithm, in time-varying MIMO channels is confirmed through various simulations.

关键词： Channel estimation Detection algorithms MIMO Signal processing algorithms Detectors Frequency estimation Fading Antenna arrays Transmitters Intersymbol interference

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A new interference cancellation technique for CDMA signals

A new interference cancellation technique for CDMA signals

引用

IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： E. Karami M. Shiva Center of Excellence on Applied Electromagnetic Systems Department of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran

In this paper, an efficient method for multiuser detection of Code Division Multiple Access (CDMA) signals is proposed which provides soft output with remained noise distribution close to Gaussian. Therefore the proposed algorithm is efficient for both coded and uncoded signals. This algorithm is simulated for BPSK signals with random spreading. The performance of the receiver is analyzed in terms of Bit Error Rate (BER) of each user for under load, full load and overload conditions. Simulation results show that performance of the proposed algorithm is very close to optimum receiver for both coded and uncoded user signals, moreover, it also outperforms the previous proposed algorithms.

关键词： Interference cancellation Multiaccess communication Multiuser detection Wireless communication Multiple access interference Computational complexity Decorrelation Gaussian noise Binary phase shift keying Bit error rate

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From cognitive psychology to cognitive informatics

From cognitive psychology to cognitive informatics

引用

IEEE International Conference on Cognitive Informatics

作者： V. Chiew Yingxu Wang Theoretical and Empirical Software Engineering Research Center Department of Electrical and Computer Engineering University of Calgary Calgary AB Canada

Cognitive informatics is the transdisciplinary study of cognitive and information sciences that investigates into the internal information processing mechanism and processes of the natural intelligence - human brains and minds. This paper presents an extensive literature review on related research in psychology, or cognitive science, informatics, computer science that led to the emergence of cognitive informatics.

关键词： Psychology Cognitive informatics Cognitive science Humans Information processing computer science Artificial intelligence Cognition Knowledge acquisition software engineering

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Formal description of a real-time operating system using RTPA

Formal description of a real-time operating system using RTP...

引用

Canadian Conference on Electrical and computer engineering (CCECE)

作者： Y. Wang C.F. Ngolah Theoretical and Empirical Software Engineering Research Center Department of Electrical and Computer Engineering University of Calgary Calgary AB Canada

Most industrial computing systems are real-time systems where rigid time constraints must be met. Great attention should therefore be given to the design of real-time operating system (RTOS) because its malfunction may result in a disaster both to business and human life. Current RTOS's are target-machine and application specific. This paper develops a new architecture of RTOS's, RTOS+, which is generic and portable to different platforms. We adopt real-time process algebra (RTPA) to specify and describe RTOS+, particularly its architecture and dynamic behaviours. On the basis of the formal specification, architecture, behaviours, and correctness of RTOS+ can be guaranteed. The core operations of RTOS+, such as task scheduling, time, event and resource management can be rigorously described for better real-time performance and improved resource utilization.

关键词： Real time systems Operating systems Resource management Control systems Algebra Formal specifications Job shop scheduling Processor scheduling software engineering Drives

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Air/fuel ratio control in SI1 engines using a combined neural network and estimator

Air/fuel ratio control in SI1 engines using a combined neura...

引用

IEEE Conference on Control Technology and Applications (CCTA)

作者： M.J. Yazdanpanah A. Kalhor Intelligent Control & Processing Center of Excellence Department Of Electrical And Computer Engineering Faculty Of Engineering University Of Tehran Tehran Iran

In this paper by using a controller based on a neural network and an estimator, an efficient method in A/F ratio for SI engines is presented. This combined method improves plant performance effectively and provides robustness against disturbances due to work point changing. It is shown that by combining two separate methods, a useful control strategy may be generated. Simulation results reveal the superiority of this method.

关键词： Fuels Intelligent networks Neural networks Internal combustion engines Engine cylinders Manifolds Gases Testing Delay Sliding mode control

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