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17th International Symposium on Power Semiconductor Devices and ICs, ISPSD'05

作者： Zmeck, M. Balk, L.J. Heiderhoff, R. Osipowicz, T. Watt, F. Phang, J.C.H. Khambadkone, A.M. Niedernostheide, F.-J. Schulze, H.-J. Fachbereich Elektrotechnik and Informationstechnik Lehrstuhl für Elektronik Bergische Universität Wuppertal Rainer-Gruenter-Straße 21 D-42119 Wuppertal Germany Centre for Ion Beam Applications Department of Physics National University of Singapore 2 Science Drive 3 117542 Singapore Singapore Centre for Integrated Circuit Failure Analysis and Reliability Department of Electrical and Computer Engineering National University of Singapore 10 Kent Ridge Crescent Singapore 119260 Singapore Centre for Power Electronics Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117576 Singapore Infineon AG Balanstrasse 59 D-81541 München Germany

In this paper time resolved Ion Beam Induced Charge (IBIC) microscopy is introduced as a tool for the characterization of electrical field distributions within reverse biased high-power devices. Two dimensional maps of different parameters of the measured IBIC transients are discussed and compared with simulated IBIC data. © 2005 IEEE.

关键词： Ion microscopes

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Analysis of premature breakdown in high-power devices using IBIC microscopy

Analysis of premature breakdown in high-power devices using ...

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2005 European Conference on Power Electronics and applications

作者： Zmeck, M. Balk, L.J. Pugatschow, A. Niedernostheide, F.-J. Schulze, H.-J. Osipowicz, T. Watt, F. Phang, J.C.H. Khambadkone, A.M. Fachbereich Elektrotechnik Informationstechnik Medientechnik Elektronik Bergische Universität Wuppertal Rainer-Gruenter-Straße 21 D-42119 Wuppertal Germany Infineon Technologies AG Balanstr. 59 D-81541 Munich Germany Centre for Ion Beam Applications Department of Physics National University of Singapore 2 Science Drive 3 117542 Singapore Singapore Centre for Integrated Circuit Failure Analysis and Reliability Department of Electrical and Computer Engineering National University of Singapore 10 Kent Ridge Crescent Singapore 119260 Singapore Centre for Power Electronics Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 117576 Singapore Singapore

ISBN: (纸本)9075815085

Ion Beam Induced Charge (IBIC) microscopy is used mainly for analysis of various semiconductor parameters such as diffusion length and lifetime of the charge carriers. In this paper, we show that IBIC microscopy is also useful for the visualization of the electrical field distribution within depletion regions of electronic devices. The ions penetrating into the semiconductor generate electron-hole pairs that are separated and accelerated depending on the internal electric field distribution. The shape of the resulting current induced in this way is dependent on the electric field. This dependence and the large penetration depth of the light ions allow the analysis of electric field distributions within semiconductor devices up to a few tens of microns below the device surface. Therefore, IBIC microscopy is a very useful analytical tool for the characterization of the electrical field distribution within high-power devices, even when the semiconductor is covered with thick passivation or metallization layers.

关键词： Electric breakdown

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Analysis and Test of a High-Speed Axial Flux Permanent Magnet Synchronous Motor

Analysis and Test of a High-Speed Axial Flux Permanent Magne...

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IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： L. Zheng T.X. Wu K.B. Sundaram J. Vaidya L. Zhao D. Acharya C.H. Ham J. Kapat L. Chow School of Electrical Engineering and Computer Science University of Central Florida Orlando FL USA ElectroDynamic Applications Inc. Oviedo FL USA Department of Mechanical Materials and Aerospace Engineering University of Central Florida Orlando FL USA

This paper gives the analysis and test of a surface mounted axial flux permanent magnet synchronous motor (PMSM) for a high-speed centrifugal compressor drive. Both analytical analysis and 3-D electromagnetic finite element method (FEM) are used to calculate flux density in the airgap, rotor back iron, and stator iron. 3-D FEM is used to simulate the electromotive force (back EMF) and torque. The motor has been tested up to 87,000 rpm using an open-loop controller. The advantages and disadvantages of this kind of structure are analyzed, and some improvements of this design are also considered and partially verified by experiments

关键词： Magnetic analysis Testing Permanent magnet motors Electromagnetic analysis Iron Electromagnetic forces Finite element methods Rotors Stators Analytical models

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Active and passive millimeter and sub-millimeter-wave imaging

Active and passive millimeter and sub-millimeter-wave imagin...

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Technologies for Optical Countermeasures II;Femtosecond Phenomena II;and Passive Millimetre-Wave and Terahertz Imaging II

作者： Petkie, Douglas T. De Lucia, Frank C. Casto, Corey Helminger, Paul Jacobs, Eddie L. Moyer, Steven K. Murrill, Steve Halford, Carl Griffin, Steve Franck, Charmaine Department of Physics Wright State University Dayton OH United States Department of Physics Ohio State University Columbus OH United States Department of Physics University of South Alabama Mobile AL United States Night Vision and Electronic Sensors Directorate Fort Belvoir VA United States Army Research Laboratory Adelphi MD United States Department of Electrical and Computer Engineering University of Memphis Memphis TN United States Science Applications International Corporation United States

We have developed several millimeter/submillimeter/terahertz systems to study active and passive imaging and associated phenomenology. For measuring the transmission and scattering properties of materials, we have developed a dual rotary stage scattering system with active illumination and a Fourier Transform spectrometer. For imaging studies, we have developed a system based on a 12-inch diameter raster-scanned mirror. By interchange of active sources and both heterodyne and bolometric detectors, this system can be used in a variety of active and passive configurations. The laboratory measurements are used as inputs for, and model calibration and validation of, a terahertz imaging system performance model used to evaluate different imaging modalities for concealed weapon identification. In this paper, we will present examples of transmission and scattering measurements for common clothing as well as active imaging results that used a 640 GHz source and receiver.

关键词： Imaging techniques

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Relevance vector machine for content-based retrieval of 3D head models

Relevance vector machine for content-based retrieval of 3D h...

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International Conference on Information Visualisation (IV)

作者： Pui Fong Yeung Hau San Wong Bo Ma H.H.-S. Ip Department of Computer Science and Information Engineering City University of Hong Kong Hong Kong China Centre for Innovative Applications of Internet and Multimedia Technologies (AIMtech) Centre City University of Hong Kong Hong Kong China

In this paper, we propose a novel 3D head model retrieval approach in which the queries are 2D face views instead of less readily available 3D head models. The basic idea is to characterize the corresponding relations between 2D view feature and 3D model feature based on a machine learning approach. Thus the subsequent feature matching can be carried out in 3D feature space. As an effective solution to regression problems, relevance vector machine is used in this paper to establish an association between 2D and 3D features. Experimental results show that our proposed 2D query based method is comparable with the direct 3D query based one.

关键词： Content based retrieval Magnetic heads Information retrieval Image retrieval Predictive models computer science Application software Internet Machine learning Videos

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Modeling of human driving behavior based on piecewise linear model

Modeling of human driving behavior based on piecewise linear...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Jong-Hae Kim S. Okuma Young-Woo Kim Don-Ha Hwang Min-Huei Kim Dong-Hee Kim Department of Electrical Engineering and Computer Science Graduate School of Engineering University of Nagoya Japan Space Robotics Research Center Toyota Technological Institute Nagoya Japan Industry Applications Research Laboratory Korea Electrotechnology Research Institute Changwon South Korea Department of Electrical & Automation Engineering Yeungnam College of Science and Technology Daegu South Korea Department of Electrical Engineering Yeungnam University Kyungbuk South Korea

This paper presents the development of the modeling strategy of the human driving behavior based on the expression as Piecewise Linear (PWL) model focusing on the driver’s stopping maneuver. The driving data are collected by using the three-dimensional driving simulator based on CAVE, which provides stereoscopic immersive vision. In our modeling, the relationship between the driver’s sensory information and the operation of the driver such as braking amount is expressed by PWL model, which is a class of Hybrid Dynamical System (HDS). The identification problem for the PWL model is formulated as the Mixed Integer Linear Programming (MILP) by transforming the switching conditions into binary variables. From the obtained results, it is found that the driver appropriately switches the ‘control low’ according to the sensory information. These results enable us to capture not only the physical meaning of the driving skill, but also the decision-making aspect (switching conditions) in the driver’s stopping maneuver.

关键词： Humans Piecewise linear techniques Hidden Markov models Decision making computer science Space technology Robotics and automation Switches Automatic control Service robots

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CONSERVATION OF FILTERING IN MANUFACTURING SYSTEMS

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IFAC Proceedings Volumes 2005年第1期38卷 165-170页

作者： Jingshan Li Emre Enginarlar Semyon M. Meerkov Manufacturing Systems Research Lab General Motors Research & Development Center Warren MI 48090-9055 Decision Applications Division Los Alamos National Laboratory Los Alamos NM 87545 Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109-2122

This paper addresses the issue of reliable satisfaction of customer demand by unreliable production systems. Using a simple Production-Storage-Customer model, we show that this can be accomplished by filtering out production randomness. The filtering of randomness is ensured by finished goods buffers (filtering in space) and shipping periods (filtering in time). The following question is considered: How are filtering in space and in time interrelated? As an answer, we show that there exists a conservation law: In lean manufacturing systems, the amount of filtering in space multiplied by the amount of filtering in time (both measured in appropriate dimensionless units) is practically constant.

关键词： Manufacturing systems Filtering Conservation law

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Mining top – k ranked webpages using simulated annealing and genetic algorithms

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2nd Asian Applied Computing Conference, AACC 2004

作者： Deepa Shenoy, P. Srinivasa, K.G. Thomas, A.O. Venugopal, K.R. Patnaik, L.M. Department of Computer Science and Engineering University Visvesvaraya College of Engineering Bangalore India Microprocessor Applications Laboratory Indian Institute of Science Bangalore India

ISBN: (纸本)9783540236597

Searching on the Internet has grown in importance over the last few years, as huge amount of information is invariably accumulated on the Web. The problem involves locating the desired information and corresponding URLs on the WWW. With billions of webpages in existence today, it is important to develop efficient means of locating the relevant webpages on a given topic. A single topic may have thousands of relevant pages of varying popularity. Top - k document retrieval systems identifies the top - k ranked webpages pertaining to a given topic. In this paper, we propose an efficient top-k document retrieval method (TkRSAGA), that works on the existing search engines using the combination of Simulated Annealing and Genetic Algorithms. The Simulated Annealing is used as an optimized search technique in locating the top-k relevant webpages, while Genetic Algorithms helps in faster convergence via parallelism. Simulations were conducted on real datasets and the results indicate that TkRSAGA outperforms the existing algorithms. © Springer-Verlag Berlin Heidelberg 2004.

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Harmonic control for maximum bus utilization

Harmonic control for maximum bus utilization

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Collection of Technical Papers - 2nd International Energy Conversion engineering Conference

作者： Brzezinski, Brent J. Haskew, Tim A. Dawson, Charlie Electrical and Computer Engineering University of Alabama Tuscaloosa AL 35487 Science Applications International Corporation Huntsville AL 35805 Department of Electrical and Computer Engineering Box 870286 Tuscaloosa AL 35487

ISBN: (纸本)1563477157

In typical electric vehicle applications, the user input is effectively a torque command. Ideally, a constant maximum steady-state speed is available through a constant maximum steady-state torque. A permanent magnet synchronous machine (PMSM) is used in many electric vehicles. For a given mechanical load level, in steady state, a PMSM appears as a purely resistive electrical load. Operation reduces to a linear relationship between maximum steady-state speed and required line-line terminal voltage. Pulse width modulated power semiconductors allow variable speed operation of a PMSM. Addition of the third harmonic to a sinusoidal modulating function increases the maximum line-line voltage by increasing the fundamental of the developed voltage. Additional harmonics can be added to the modulation function to produce a larger fundamental voltage. Additional non-triplen harmonics are not filtered by the three-phase system. An equation for third harmonic magnitude, subject to minimization of the magnitude of an added fifth harmonic, necessary to produce a required fundamental voltage is presented with experimental results. Copyright © 2004 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Electric vehicles

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Efficient encoding and decoding algorithms for distributed resampling

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Journal of the Indian Society of Remote Sensing 2004年第3期32卷 269-286页

作者： Vamsi Kiran, D. Srinivasa Rao, C. Ramakrishnan, R. Gupta, P. Department of Computer Science and Engineering Indian Institute of Technology Kanpur Kanpur - 208 016 India Space Applications Center Indian Space Research Organization Ahmedabad - 380 015 India

This paper discusses algorithms for compressing floating point data which is encountered while performing resampling algorithm for rectifying geometric distortions on the images transmitted by the remote sensing satellite on a distributed computing environment. Two efficient algorithms Ibr encoding and decoding floating point data compression, (i) 3-byte packing and (ii) 3-byte + 2-bit packing have been proposed. Both algorithms are tested to execute resampling algorithm on radiometrically corrected for IRS- LISS-III 4 bands data on a distributed system. First algorithm compresses 4-byte floating point data to 3-byte obtaining 25% compression while later one compresses 4-byte floating point data to 3-byte + 2-bit achieving about 18.75% compression. The computational time is reduced by 22% as compared to the distributed resampling algorithms without compression. Further it is found that in Iossy compression algorithm only 220 pixels out of 37.4 MB pixels have utmost one Gray count difference, which will not pose any issues for digital classification or any other methods that will be employed in the corrected image by Image Analysts.

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