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2004 MRS Fall Meeting

作者： Xi, Y. Xi, J.-Q. Gessmann, Th. Shah, J.M. Kim, J.K. Schubert, E.F. Fischer, A.J. Crawford, M.H. Bogart, K.H.A. Allerman, A.A. Future Chips Constellation Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy NY 12180 Future Chips Constellation Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180 Compound Semiconductor Research Laboratory Sandia National Laboratories Albuquerque NM 87185

The junction temperature of AlGaN/GaN ultraviolet (UV) Light-Emitting Diodes (LEDs) emitting at 295 nm is measured by using the temperature coefficients of the diode forward voltage and emission peak energy. The high-energy slope of the spectrum is explored to measure the carrier temperature. A linear relation between junction temperature and current is found. Analysis of the experimental methods reveals that the diode-forward voltage is the most accurate method (± 3°C). A theoretical model for the dependence of the diode junction voltage (Vj) on junction temperature (T) is developed that takes into account the temperature dependence of the energy gap. A thermal resistance of 87.6 K/W is obtained with the AlGaN/GaN LED sample mounted with thermal paste on a heat sink. © 2005 Materials Research Society.

关键词： Light emitting diodes

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Recognizing interaction from a robot's perspective

Recognizing interaction from a robot's perspective

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IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： T. Salter F. Michaud K. Dautenhahn D. Letourneau S. Caron LABORIUS-Research Laboratory on Mobile Robotics and Intelligent Systems Department of Electrical Engineering and Computer Engineering Université de Sherbrook Sherbrooke QUE Canada Adaptive Systems Research Group School of Computer Science University of Herfordshire Hatfield UK

For meaningful interaction between a robot and a human, an autonomous robot must recognize whether the experienced situation is created by people or by the environment. Using only proprioceptive data from a mobile robotic platform, we discover that it is possible to distinguish sensory data patterns involving interaction. These patterns are obtained whilst navigating varying environments, both human populated and unpopulated. The paper reports the initial set of trials using Roball, a spherical mobile robot. Also described is the experimental methodology currently followed to validate the hypothesis that child interaction can be perceived directly from navigation sensors onboard a robotic platform.

关键词： Robot sensing systems Mobile robots Human robot interaction Navigation Intelligent robots Sensor phenomena and characterization Infrared sensors Educational institutions Plastics Mobile computing

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Performance of optimum combining with channel estimation errors

Performance of optimum combining with channel estimation err...

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IEEE Conference on Vehicular Technology (VTC)

作者： B. Kecicioglu M. Torlak A. Kavak Wireless Information Systems Laboratory(WISLAB) Department of Electrical Engineering University of Texas Dallas Richardson TX USA Department of Computer Engineering Kocaeli University Izmir Turkey

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Design and experimental validation of a multiphase VRM controller

Design and experimental validation of a multiphase VRM contr...

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作者： Mazumder, S.K. Kamisetty, S.L. Laboratory for Energy and Switching-Electronics Systems Department of Electrical and Computer Engineering University of Illinois 851 S Morgan St 1020 SEO Chicago IL 60607 United States Servo Tech Inc. 1747 W. Roosevelt Road Chicago IL 60680 United States

By combining the concepts of multiple-sliding-surface and integral-variable-structure controls, one can develop a robust controller for a multiphase 9V VRM, which comprises four parallel DC-DC synchronous buck converters operating at 300kHz. The advantages of the control scheme are its simplicity in design, good dynamic response, robustness, ability to nullify the bus-voltage error and the error between the load currents of the converter modules, and ability to reduce the impact of high-frequency dynamics due to parasitics on the closed-loop control system. Unlike a conventional variable-structure controller (VSC), which achieves superior transient performance by optimising (and hence, by varying) the switching frequency, the novel controller is able to retain the excellent dynamic performance of a conventional VSC and yet maintain a constant-frequency operation of a PWM controller under 'steady-state' condition. The latter is achieved by obtaining a duty-ratio signal;however, unlike a PWM controller, the new controller calculates the duty ratio based on Lyapunov's stability crietrion. Thus, the new controller also permits interleaved operation of the VRM modules. © IEE, 2005.

关键词： Control equipment

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Power system optimization and coordination of damping controls by series FACTS devices

Power system optimization and coordination of damping contro...

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IEEE Power engineering Society Conference and Exposition in Africa, PowerAfrica

作者： Jung-Wook Park R.G. Harley G.K. Venayagamoorthy LG Electronics Inc. Seoul South Korea School of Electrical and Computer Engineering Georgia Institute of Technology USA Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA

Controllable series line compensation by series flexible ac transmission system (FACTS) devices can provide significant transient stability improvement and effective power oscillation damping. The work presented in this paper gives an overview of control issues of series FACTS devices contributing to stable power system operation when applying suitable controllers with appropriately selected system measurements. Firstly, this paper describes two internal control schemes, which are based on the automatic power flow control mode and line impedance compensation mode, for a switching converter type based series FACTS device. Secondly, it shows that the external (secondary) control can give a solution for overall system optimization by providing well-established supplementary controls and adaptive reference changes to the internal controller. Case studies are presented with simulation results by applying the proposed controllers to the series FACTS device on a power system

关键词： Power systems Damping Control systems Automatic control Power system stability Power system transients Flexible AC transmission systems Power system simulation Power system measurements Power system control

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An adaptive Mamdani fuzzy logic based controller for a static compensator in a multimachine power system

An adaptive Mamdani fuzzy logic based controller for a stati...

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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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A retraining methodology for enhancing agent intelligence

A retraining methodology for enhancing agent intelligence

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International Conference on Integration of Knowledge Intensive Multi-Agent systems (KIMAS)

作者： P.A. Mitkas A.L. Symeonidis I.N. Athanasiadis Intelligent Systems and Software Engineering Laboratory Informatics and Telematics Institute CERTH Thessaloniki Greece Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

Data mining has proven a successful gateway for discovering useful knowledge and for enhancing business intelligence in a range of application fields. Incorporating this knowledge into already deployed applications, though, is highly impractical, since it requires reconfigurable software architectures, as well as human expert consulting. In an attempt to overcome this deficiency, we have developed agent academy, an integrated development framework that supports both design and control of multiagent systems (MAS), as well as agent training. We define agent training as the automated incorporation of logic structures generated through data mining into the agents of the system. The increased flexibility and cooperation primitives of MAS, augmented with the training and retraining capabilities of agent academy, provide a powerful means for the dynamic exploitation of data mining extracted knowledge. In this paper, we present the methodology and tools for agent retraining. Through experimental results with the agent academy platform, we demonstrate how the extracted knowledge can be formulated and how retraining can lead to the improvement - in the long run - of agent intelligence.

关键词： Intelligent agent Delta modulation Data mining Humans Companies Application software Software architecture Multiagent systems Reconfigurable logic Collaborative software

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Optimal dynamic neurocontrol of a gate-controlled series capacitor in a multi-machine power system

Optimal dynamic neurocontrol of a gate-controlled series cap...

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

作者： S. Ray G.K. Venayagamoorthy E.H. Watanabe F.D. de Jesus Real-Time Power and Intelligent Systems (RTPIS) Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA Department of Electrical Engineering Federal University of Rio Grande do Sul Brazil

This paper presents the design of an optimal dynamic neurocontroller for a new type of FACTS device - the gate controlled series capacitor (GCSC) incorporated in a multi-machine power system. The optimal neurocontroller is developed based on the heuristic dynamic programming (HDP) approach. In addition, a dynamic identifier/model and controller structure using the recurrent neural network trained with backpropagation through time (BPTT) is employed. Simulation results are presented to show the effectiveness of the dynamic neurocontroller and its performance is compared with that of the conventional PI controller under small and large disturbances

关键词： Power system dynamics Capacitors Power systems Neurocontrollers Power system modeling Power system simulation Optimal control Control systems Dynamic programming Recurrent neural networks

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A haptic interface for human-in-the-loop manipulation at the nanoscale 1

A haptic interface for human-in-the-loop manipulation at the...

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1st Joint Eurohaptics Conference and Symposium on Haptic Interfaces for Virtual Environment and Teleoperator systems - World Haptics Conference, WHC 2005

作者： Tan, Hong Z. Walker, Laron Reifenberger, Ron Mahadoo, Sorubh Chiu, George Raman, Arvind Helser, Aron Colilla, Pablo Haptic Interface Res. Lab School of Electrical and Computer Engineering United States Nanophysics Laboratory Department of Physics Purdue University West LafayetteIN47907 United States Spira Laboratories for Electromechanical Systems School of Mechanical Engineering United States 3rdTech Chapel HillNC United States Nanotec Electronica Spain

ISBN: (纸本)0769523102

This paper outlines major challenges that we are facing in interfacing a human user with objects in the nanoworld via a haptic interface. After a review of prior efforts at haptically-enabled nanomanipulation systems, we present the current state of our nanomanipulator system. We then discuss current research issues including the direct-Z mode, force modeling, data transfer rates and the stability of the haptic interface. Results of nanomanipulation of single-walled carbon nanotubes are presented. It is our hope that the insight gained by the human user of a haptic interface to SPM leads to scanning algorithms that can automatically adjust the SPM parameters based on the properties of the nanosample and the substrate under investigation. © 2005 IEEE.

关键词： Haptic interfaces

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