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International Conference on Intelligent systems Applications to Power systems (ISAP)

作者： S. Mohagheghi G.K. Venayagamoorthy R.G. Harley School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA University of KwaZulu-Natal South Africa

An adaptive Mamdani based fuzzy logic controller has been designed for controlling a static compensator (STATCOM) in a multimachine power system. Such a controller does not need any prior knowledge of the plant to be controlled and can efficiently control a STATCOM during different disturbances in the network. A model free approach using the controller output error is applied for training purposes that adaptively changes the controller output parameters based on a gradient descent method. Moreover, shrinking span membership functions are used for a more stable and accurate control performance. Simulation results show that the proposed controller outperforms the conventional PI controller during dynamic and transient disturbances

关键词： Programmable control Adaptive control Fuzzy logic Control systems STATCOM Power systems Automatic voltage control Power system modeling Adaptive systems Error correction

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Guest Editorial Wireless Ad Hoc Networks—Part I

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IEEE Journal on Selected Areas in Communications 2005年第1期23卷 1-6页

作者： J.E. Wieselthier E. Altman A. Ephremides J.P. Macker H.B. Russell M. Steenstrup S.B. Wicker A. Segall Information Technology Division Naval Research Laboratory Washington DC USA INRIA Sophia-Antipolis Cedex France Electrical and Computer Engineering Department and the Institute for Systems Research University of Maryland College Park MD USA Department of Electrical and Computer Engineering Clemson University Clemson SC USA Clemson University Stow Research L.L.C. Clemson Flanders SC NJ USA School of Electrical and Computer Engineering Cornell University Ithaca NY USA

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Run-to-run overlay control of steppers in semiconductor manufacturing systems based on history data analysis and neural network modeling

Run-to-run overlay control of steppers in semiconductor manu...

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作者： Park, Seong-Jin Lee, Moon-Sang Shin, Sung-Young Cho, Kwang-Hyun Lim, Jong-Tae Cho, Bong-Su Jei, Young-Ho Kim, Myung-Kil Park, Chan-Hoon Department of Electrical and Computer Engineering Ajou University Suwon Korea Republic of Semiconductor Business Samsung Electronics Hwasung Korea Republic of School of Electrical Engineering University of Ulsan Ulsan Korea Republic of College of Medicine Korea Bio-MAX Institute Seoul National University Seoul Korea Republic of Department of Electrical Engineering Korea Advanced Institute of Science and Technology Taejon Korea Republic of Memory Division Samsung Electronics Korea Republic of College of Medicine Seoul National University Seoul Korea Republic of Bio-MAX Institute Seoul National University Korea Republic of Systems Biology Laboratory Korea Republic of IEE Korea Republic of KIEE Korea Republic of ICASE United States Division of Electrical Engineering Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Taejon Korea Republic of KITE Memory Division Samsung Electronics Korea Republic of Photolithography Technology of Semiconductor FAB

This paper presents a new run-to-run control scheme to reduce overlay misalignment errors in steppers and demonstrates the feasibility of the scheme by real-time experimental tests. The overlay misalignment error mainly depends on two factors: one is the internal dynamics of photo processes and steppers and the other is the process history of lots, such as base equipment and reticles. Based on these observations, a new control scheme was designed to find the stepper inputs minimizing the misalignment errors based on history data analysis and neural network models. Moreover, we demonstrated that the proposed control scheme reduces the spec-out ratios as well as the number of engagements of the send-ahead wafer process, which thereby results in the increase of product yield in semiconductor manufacturing. © 2005 IEEE.

关键词： Semiconductor materials

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Multiobjective Optimization of Air-Core Linear Permanent Magnet Synchronous Motors for Improved Thrust and Low Magnet Consumption

Multiobjective Optimization of Air-Core Linear Permanent Mag...

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2005国际电机与系统学术会议

作者： S.Vaez-Zadeh A. Hassanpour Isfahani Advanced Motion Systems Research Laboratory Department of Electrical and Computer Engineering University of Tehran North Kargar Avenue P.O. Box 14395/515 Tehran IRAN Advanced Motion Systems Research Laboratory Department of Electrical and Computer Engineering University of Tehran North Kargar Avenue P.O. Box 14395/515 Tehran IRAN

In this paper a multiobjective design optimization of an air-core linear permanent magnet synchronous motor is presented. Thrust, thrust ripple and consumed magnet volume are chosen as objectives for design optimizati... 详细信息

关键词： net Multiobjective Optimization of Air-Core Linear Permanent Magnet Synchronous Motors for Improved Thrust and Low Magnet Consumption

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Electromechanical modeling of high power RFMEMS switches with ohmic contact

Electromechanical modeling of high power RFMEMS switches wit...

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2005 European Microwave Conference

作者： Tan, S.G. McErlean, E.P. Hong, J.-S. Cui, Z. Wang, L. Greed, R.B. Voyce, D.C. Department of Electrical Electronic and Computer Engineering Heriot-Watt University Edinburgh EH14 4AS United Kingdom Central Microstructure Facility Rutherford Appleton Laboratory Didcot United Kingdom Technology Research Centre BAE Systems Chelmsford Essex CM2 8HN United Kingdom

ISBN: (纸本)2960055128

This paper presents a study of the behaviour of electrically actuated RF-MEMS switches with ohmic contact. We will discuss about the relationship between the actuation voltage, displacement and the corresponding contact force experienced by the switch. We will demonstrate the linear behaviour of the switch when factors such as width or length of the switch arm are varied. Experimental results for DC actuation are also presented.

关键词： Electric switches

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2 × 2 RF MEMS switch matrix

2 × 2 RF MEMS switch matrix

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作者： McErlean, E.P. Hong, J.-S. Tan, S.G. Wang, L. Cui, Z. Greed, R.B. Voyce, D.C. Department of Electrical Electronic and Computer Engineering Heriot-Watt University Edinburgh EH14 4AS United Kingdom Central Microstructure Facility Rutherford Appleton Laboratory Didcot United Kingdom Advanced Technology Research Centre BAE Systems Chelmsford Essex CM2 8HN United Kingdom

The authors report on the recent development of a 2 × 2 RF MEMS switch matrix for high power applications. The RF design and modelling of the switch matrix using full-wave electromagnetic (EM) simulations are described. The method of fabrication and experimental setup are presented. Results for the recorded RF performance for on and off states are presented. Power handling characteristics of the switch are also examined. Some challenging issues for the development of this type of device are addressed.

关键词： Microelectromechanical devices

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A comparison of PSO and backpropagation for training RBF neural networks for identification of a power system with STATCOM

A comparison of PSO and backpropagation for training RBF neu...

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IEEE Swarm Intelligence Symposium, SIS

作者： S. Mohaghegi Y. del Valle G.K. Venayagamoorthy R.G. Harley School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA Professor Emeritus University of KwaZulu-Natal South Africa

Backpropagation algorithm is the most commonly used algorithm for training artificial neural networks. While being a straightforward procedure, it suffers from extensive computations, relatively slow convergence speed and possible divergence for certain conditions. The efficiency of this method as the training algorithm of a radial basis function neural network (RBFN) is compared with that of particle swarm optimization, for neural network based identification of a small power system with a static compensator. The comparison of the two methods is based on the convergence speed and robustness of each method.

关键词： Neural networks Power systems Automatic voltage control Artificial neural networks Backpropagation algorithms Convergence Radial basis function networks Particle swarm optimization STATCOM Robustness

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A hybrid approach to decrease port influence in transmission line characterization

A hybrid approach to decrease port influence in transmission...

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IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： Jianmin Zhang D.J. Pommerenke J.L. Drewniak R.E. DuBroff Zhiping Yang Wheling Cheng J. Fisher S. Camerlo Electromagnetic Compatibility Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla Rolla MO USA Cisco Systems Inc. San Jose CA USA

Characterization and models for multi-gigabit signaling is an important issue in modern digital system. A good physical based model relies on a precise characterization of the test board. Typically, the characterization of the test board is associated with scattering matrix parameter measurement, which can be done with a VNA (vector network analyzer) in the frequency-domain or a TDR (time domain reflectometer) in the time-domain. The commonly used launch techniques on PCBs (printed circuit boards) associated with the VNA or TDR measurement in the microwave frequency range use SMA or 3.5 mm connectors, in edge-launch or vertical-launch fashions. The transition between the launch port and the DUT (device under test) introduces errors in the measurement. Embedding/de-embedding techniques are used to remove the port influences in the measurement generally. For example, TRL (through, reflect, and line) calibration is the typical method used in measurement to eliminate port influences. However, extra test kits are needed for TRL calibration, and furthermore the TRL calibration is sometimes difficult to implement, such as in coupled differential lines. In this paper, an effective hybrid approach for transmission line characterization is proposed, which includes choosing a suitable port launch technique for the test board, port parasitic parameters estimation, and building up a proper circuit model for evaluation with genetic algorithms (GA).

关键词： Transmission lines Circuit testing Calibration Transmission line matrix methods Transmission line measurements Frequency measurement Time domain analysis Digital systems Scattering parameters Time measurement

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An alternative dynamic channel assignment technique for use in satellite-aided cellular systems

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WSEAS Transactions on Communications 2005年第7期4卷 345-354页

作者： Dimitriadou, E. Ioannou, K. Panoutsopoulos, I. Mougiakakou, S. Stavroulakis, P. Kotsopoulos, S. Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece Automation Laboratory Department of Electronic and Computer Engineering Technical University of Crete Kounoupidiana 73100 Chania Greece Institute of Communication and Computer Systems 9 Iroon Polytechniou Str. 15780 Zographou Athens Greece

This paper presents an alternative dynamic channel assignment technique for use in Satellite-Aided Cellular systems. It is based on a three-layer cellular architecture. The use of the proposed technique optimizes the QoS of Ultra High-Speed (UHSMT) and High-Speed Moving Terminals (HSMT). The lower layer of the proposed architecture absorbs the traffic loads of Low Speed Moving Terminals (LSMT). The second layer absorbs the traffic load of the HSMT and the higher layer based on a satellite cell absorbs the traffic load of UHSMT. The results of simulating the proposed technique show that assigning the optimum number of channels in every layer, the QoS of UHSMT and HSMT are optimized especially in High Traffic Conditions, having a small negative effect on the QoS of LSMT.

关键词： Cellular radio systems

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Wavelength-selective integrated optical MEMS filter in InP

Wavelength-selective integrated optical MEMS filter in InP

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IEEE International Conference on Micro Electro Mechanical systems

作者： M. Datta M.W. Pruessner K. Amarnath J. McGee S. Kanakaraju R. Ghodssi MEMS Sensors and Actuators Laboratory (MSAL) Department of Electrical and Computer Engineering Institute of Systems Research University of Maryland College Park MD USA Laboratory of Physical Science College Park MD USA

This paper presents a low-power, electrostatically-actuated integrated optical filter on an InP MEMS platform. The micromachined filter achieves a resonant wavelength shift of 12nm (1513-1525nm) at a low operating voltage (7V). The filter consists of a half-wavelength long resonant cavity bound by two highly reflective distributed Bragg reflector (DBR) mirrors fabricated by lithography and dry-etching. The filter is integrated monolithically with a doubly-clamped suspended-beam capacitive microactuator and optical waveguides. This paper discusses the fabrication as well as experimental results, showing good agreement between the measured and simulated performance of the filter. The novelty of the device lies in its in-plane MEMS actuation scheme enabling easy integration with other waveguide-based planar integrated optical active and passive components on an InP optoelectronic chip.

关键词： Optical filters Integrated optics Micromechanical devices Indium phosphide Optical waveguides Resonance Distributed Bragg reflectors Low voltage Mirrors Lithography

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