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IEEE Annual Conference on Wireless and Microwave Technology (WAMICON)

作者： Charles Baylis Lawrence Dunleavy Rick Connick Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX USA Center of Wireless and Microwave Information Systems Department of Electrical Engineering University of South Florida Tampa FL USA Modelithics Inc. Tampa FL USA

The success of simulation-based design of power amplifiers for wireless communications is limited by the accuracy of nonlinear models that are used to represent the transistors. This paper provides some considerations that should be taken into account in measurement-based modeling of GaN transistors. With GaN modeling, particular attention needs to be paid to thermal and trapping issues. The use of pulsed measurements as part of the modeling process is critical to obtaining reliable GaN models. Established models such as EEHEMT, Angelov, and CFET can be successfully used in representing GaN devices.

关键词： Gallium nitride HEMTs Pulse measurements Equations Power system modeling Current measurement Power measurement Microwave devices Power amplifiers Testing

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Duty cycle dependent pulsed IV simulation and thermal time constant model fitting for LDMOS transistors

Duty cycle dependent pulsed IV simulation and thermal time c...

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ARFTG Conference

作者： Sivalingam Somasundaram Meena Charles Baylis Lawrence Dunleavy Marvin Marbell Center of Wireless and Microwave Information Systems Department of Electrical Engineering University of South Florida Tampa FL USA Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX USA Modelithics Inc. Tampa FL USA

A pulsed simulation approach is demonstrated for prediction of duty-cycle dependent thermal effects in transistors. Also a novel method is shown for fitting and/or validating electro-thermal models using pulsed IV measurements and pulsed IV simulations. A commercial LDMOS device is used to demonstrate the new methods. After extracting the thermal time constant, good agreement is achieved between measured and simulated pulsed IV results under a wide range of different pulse conditions including DC, very short (<0.1%) duty cycles, and varied pulse widths between these extremes. A three-pole electro-thermal equivalent circuit model was shown to improve the model data fitting for intermediate pulse widths.

关键词： Pulse measurements Space vector pulse width modulation Predictive models MOSFETs Thermal resistance Heating Pulse circuits Circuit simulation computer simulation Thermal engineering

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A novel anti-collision algorithm for high-density RFID tags

A novel anti-collision algorithm for high-density RFID tags

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International Conference on electrical engineering/Electronics, computer, Telecommunications and Information Technology, ECTI-CON

作者： Sarawut Makwimanloy Piya Kovintavewat Urachada Ketprom Charturong Tantibundhit Electrical and Computer Engineering Department Thammasat University Thailand RFID Technology and Applications Research Unit Nakhon Pathom Rajabhat University Nakhon Pathom Thailand RFID Program National Electronics and Computer Technology Center Thailand

In a radio frequency identification (RFID) system, when more than one tag communicates with a reader at the same time, a collision will occur resulting in the failure of that communication. Many anti-collision algorithms, such as binary tree (BT), FSA, and DFSA have been used in ISO and EPC standards to prevent such a collision. This paper develops a new anti-collision algorithm based on the BT and the DFSA algorithms. Specifically, all tags are divided into many groups using the DSFA algorithm. Then, the tags in each group are identified using the BT algorithm. Results indicate that the proposed algorithm performs better than the existing ones in terms of the number of used time slots (the less the used time slot, the faster the algorithm).

关键词： RFID tags Radiofrequency identification Partitioning algorithms Binary trees ISO standards Application software Radio frequency Access control Animals Logistics

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Controller design to regulate the DC voltage of a VSC converter

Controller design to regulate the DC voltage of a VSC conver...

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IEEE Canada Electric Power Conference, EPEC

作者： Carlos A. Hidalgo Mora Nelson L. Diaz Laboratorio de Investigacion en Fuentes Alternativas de Engergia LIFE of Universidad Distrital F J C Bogota Colombia Department of Electrical and Computer Engineering Graduate Program in Engineering-Industrial Automation LIFAE Universidad Nacional de Colombia Bogota Colombia

ISBN: (纸本)9781424445080;9781424445097

The basic function of VSCs is to convert the DC voltage stored in a capacitor into AC voltages or AC voltages into DC voltage. One of the advantages of the VSC is that this kind of electronic converters allow to control the active and reactive power flow with an ac-grid independently. This paper presents a short analysis of the characteristics and dynamic of VSC-HVDC, identification techniques to find transfer function to DC Voltage and Reactive Power in a rectifier station are explored, and finally controller design to regulate the DC voltage is exposed and tested by simulations using Matlab Simulink and its toolbox SimpowerSystems.

关键词： Voltage control Converters Power conversion Reactive power control Rectifiers Inverters Virtual colonoscopy Reactive power HVDC transmission Power system reliability

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AAAI 2008 workshop reports

AAAI 2008 workshop reports

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作者： Anand, Sarabjot Singh Bunescu, Razvan Carvcdho, Vitor Chomicki, Jan Conitzer, Vincent Cox, Michael T. Dignum, Virginia Dodds, Zachary Dredze, Mark Furcy, David Gabrilovich, Evgeniy Göker, Mehmet H. Guesgen, Hans Hirsh, Haym Jannach, Dietmar Junker, Ulrich Ketter, Wolfgang Kobsa, Alfred Koenig, Sven Lau, Tessa Lewis, Lundy Matson, Eric Metzler, Ted Mihalcea, Rada Mobasher, Bamshad Pineau, Joelle Poupart, Pascal Raja, Anita Ruml, Wheeler Sadeh, Norman Shani, Guy Shapiro, Daniel Smith, Trey Taylor, Matthew E. Wagstaff, Kiri Walsh, William Zhou, Rong Department of Computer Science University of Warwick United Kingdom School of Electrical Engineering and Computer Science Ohio University United States Microsoft Live Labs United States computer science and engineering University at Buffalo United States Computer science and economics Duke University United States Intelligent Computing group of BBN Technologies Utrecht University Netherlands Department of Computer science Harvey Mudd College United States University of Pennsylvania United States University of Wisconsin United States Yahoo Research PricewaterhouseCoopers Center for Advanced Research United States Department of Computer science School of Engineering and Advanced Technology Massey University New Zealand Departent of Computer science Rutgers University United States Department of Computer Science Dortmund University of Technology. Germany ILOG Rotterdam School of Management Erasmus University Netherlands Donald Bren School of Information and Computer Sciences University of California Irvine United States Depatrment of Computer science University of Southern California United States IBM Almaden Research Center United States Department of Computer Information Technology Southern New Hampshire University United States Computer and Information Technology Program College of Technology Purdue University United States Hughes Program for Religion and Science Dialogue Oklahoma City University United States Department of Computer Science and Engineering University of North Texas United States School of Computing DePaul University United States Department of Computer Science McGill University Canada School of Computer Science University of Waterloo Canada Department of Software and Information Systems University of North Carolina Charlotte United States University of New Hampshire United States Microsoft Research Institute for the Study of Learning and Expertise Applied Reactivity Inc. United States NASA Ames Research Center Carnegie Mellon University West

AAAI was pleased to present the AAAI-08 Workshop program. held Sunday and Monday, July 13-14, in Chicago, Illinois, USA. The program.included the following 15 workshops: Advancements in POMDP Solvers;AI Education Workshop Colloquium;Coordination, Organizations, Institutions, and Norms in Agent Systems, Enhanced Messaging;Human Implications of Human-Robot Interaction;Intelligent Techniques for Web Personalization and Recommender Systems;Metareasoning: Thinking about Thinking;Multidisciplinary Workshop on Advances in Preference Handling;Search in Artificial Intelligence and Robotics;Spatial and Temporal Reasoning;Trading Agent Design and Analysis;Transfer Learning for Complex Tasks;What Went Wrong and Why: Lessons from AI Research and Applications;and Wikipedia and Artificial Intelligence: An Evolving Synergy. Copyright © 2009, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Human robot interaction

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Performance optimization of power supply networks using renewable energy resources

Performance optimization of power supply networks using rene...

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Annual North-American Power Symposium

作者： James A. Momoh Keisha D'Arnaud Arunsi Chuku Fannie Posey-Eddy Department of Electrical and Computer Engineering Howard University College of Medicine Washington D.C. DC USA Department of Electrical and Computer Engineering (ECE) Howard University Washington DC USA Howard University Washington DC Dept. of ECE Howard University DOE-NREL Minority University Research Associates Program (MURA) National Renewable Energy Laboratory (NREL) Colorado USA

ISBN: (纸本)9781424444281

This paper presents results on an ongoing work in the area of power quality and network performance improvements utilizing Distributed Energy Resources (DERs) in power systems. The work presented particularly addresses the optimization of switching and selection of installed DERs within the network and the analysis of their impacts on the power quality, particularly, performance measures related to the voltage deviations in the network.

关键词： Optimization Power supplies Renewable energy resources Power quality Energy resources Power system analysis computing Power system measurements Performance analysis Power measurement Particle measurements

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Dynamics of SU(1,1) coherent states for the damped harmonic oscillator

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Physical Review A 2009年第5期79卷 054103-054103页

作者： Jeong Ryeol Choi Kyu Hwang Yeon School of Electrical Engineering and Computer Science Kyungpook National University 1370 Sankyuk-dong Buk-gu Daegu 702–701 Republic of Korea Department of Physics and BK21 Physics Program College of Natural Science Chungbuk National University Cheongju Chungbuk 361-763 Republic of Korea

Gerry, Ma, and Vrscay [Phys. Rev. A 39, 668 (1989)] studied the time evolution of SU(1,1) coherent states for the damped harmonic oscillator by introducing the Kanai-Caldirola Hamiltonian. The purposes of this Brief Report are to demonstrate that there are somewhat serious errors on their results and to correct them. Most of the figures given in their work are reproduced with correction in order to facilitate our explanation of results.

关键词： correction explanation results damped harmonic oscillator ANNIHILATION OPERATORS dynamics

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Multi-area integrated E/MEG and fMRI modeling

Multi-area integrated E/MEG and fMRI modeling

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Medical Imaging 2009: Biomedical Applications in Molecular, Structural, and Functional Imaging

作者： Babajani-Feremi, Abbas Bowyer, Susan Moran, John Elisevich, Kost Podell, Kenneth Soltanian-Zadeh, Hamid Image Analysis Lab. Radiology Department Henry Ford Hospital Detroit MI 48202 United States Neuromagnetism Lab. Neurology Department Henry Ford Hospital Detroit MI 48202 United States Department of Neurology Henry Ford Hospital Detroit MI 48202 United States Division of Neuropsychology and Sports Concussion Safety Program Henry Ford Hospital Detroit MI 48202 United States Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran 14395-515 Iran

ISBN: (纸本)9780819475138

Functional magnetic resonance imaging (fMRI) has complementary spatiotemporal resolution compared to Electroencephalography (EEG) as well as Magnetoencephalography (MEG). Thus, their integrated analysis should improve the overall resolution. To integrate analysis of E/MEG and fMRI, we extend our previously proposed integrated E/MEG and fMRI neural mass model to a multi-area model by defining two types of connections: the Short-Range Connections (SRCs) between minicolumns within the areas and Long-Range Connections (LRCs) between inter-areas minicolumns. The nonlinear input/output relationship in the proposed model is derived from the state space representation of the multi-area model. The E/MEG signals are originated from the overall synaptic activities of the pyramidal cells of all minicolumns and can be calculated using the lead field matrix (i.e., forward electromagnetic model). The fMRI signal is extracted from the proposed integrated model by calculating the overall neural activities in the areas and using it as the input of the extended balloon model (EBM). Using the simulation results, the capabilities of the proposed model to generate E/MEG and fMRI signals is shown. In addition, changes in the dynamics of the model to variations of its parameters were evaluated and lead us to the appropriate ranges for the parameters. In conclusion, this work proposes an effective method to integrate E/MEG and fMRI for the more effective use of these techniques in functional neuroimaging. © 2009 SPIE.

关键词： Electroencephalography

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Printed detection and resonant circuit for AM radio

Printed detection and resonant circuit for AM radio

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2009 IEEE International Symposium on Assembly and Manufacturing, ISAM 2009

作者： Noh, Jinsoo Lim, Namsoo Kim, Jaeyoung Subramanian, Vivek Cho, Gyoujin Department of Printed Electronics World Class University Program Sunchon National University 413 Jungangro Sunchon Jeonnam 540-742 Korea Republic of Printed Electronics Research Institute PARU Co. Industrial Complex Sunchon 42-2 Jeonnam Sunchon 540-813 Korea Republic of Electrical Engineering and Computer Sciences University of California Berkeley 571 Cory Hall Berkeley CA 94720-1770 United States

ISBN: (纸本)9781424446278

In this paper, we have employed printing technologies to print resonant circuit and detection circuit for an amplitude modulation system (AM radio), which consist of a printed inductor, capacitor, resistor and diode on plastic foils for using as an AM radio circuit. To test the printed inductor, capacitor, resistor and diode as components of AM radio, we selected 640 KHz, the strongest AM frequency in Sunchon City, Korea and monitored the audio signal by replacing each components by printed one. ©2009 IEEE.

关键词： Resonant circuits

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Printed detection and resonant circuit for AM radio

Printed detection and resonant circuit for AM radio

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IEEE International Symposium on Assembly and Manufacturing (ISAM)

作者： Jinsoo Noh Namsoo Lim Jaeyoung Kim Vivek Subramanian Gyoujin Cho Department of Printed Electronics of World Class University Program Sunchon National University Sunchon Jeonnam South Korea Printed Electronics Research Institute PARU Company Sunchon South Korea Electrical Engineering and Computer Sciences University of California Berkeley Berkeley CA USA

关键词： RLC circuits Inductors Capacitors Resistors Diodes Printing Amplitude modulation Plastics Circuit testing Frequency

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