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Theoretical analysis of current density distribution in superconducting plate of flat type superconducting fault current limiter

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Journal of Physics: Conference Series 2006年第1期43卷 933-936页

作者： Shimizu, H. Sannomiya, K. Watanabe, N. Yokomizu, Y. Matsumura, T. Shibuya, M. Ichikawa, M. Kado, H. Department of Electrical System Engineering Polytechnic University Sagamihara Kanagawa 229-1196 4-1-1 Hashimotodai Japan Department of Electrical Engineering and Computer Science Nagoya University Chikusa-ku Nagoya 464-8603 Furo-cho Japan Electric Power Engineering Research Laboratory Central Research Institute of Electrical Power Industry Yokosuka Kanagawa 240-0196 2-6-1 Nagasaka Japan

We have proposed an inductive (magnetic shielding) type of superconducting fault current limiter which consists of a high Tc superconducting plate in doughnut shape and spiral coil as the primary winding. In this pape...

We have proposed an inductive (magnetic shielding) type of superconducting fault current limiter which consists of a high T_c superconducting plate in doughnut shape and spiral coil as the primary winding. In this paper, the current density distribution in the superconducting plate was theoretically investigated to understand the fundamental performance of this type of current limiter. For the analysis, we developed the calculation method for the current density. The current density is distributed almost uniformly in the superconducting plate. The impedance of the current limiter changes every moment not only in current limiting operation but also normal operation. That is because the resistance in the superconducting plate and magnetic coupling condition in the current limiter also change with time. Relatively large impedance rapidly appears in the current limiter when the current density in all the area of the superconducting plate attain to the critical current density. © 2006 IOP Publishing Ltd.

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Lessons learned from automated analysis of industrial UML class models (an experience report) 05

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8th International Conference on Model Driven engineering Languages and systems, MoDELS 2005

作者： Cheng, Betty H. C. Stephenson, Ryan Berenbach, Brian Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI 48824 United States Siemens Corporate Research Inc.

ISBN: (纸本)3540290109

Automated analysis of object-oriented design models can provide insight into the quality of a given software design. Data obtained from automated analysis, however, is often too complex to be easily understood by a designer. This paper examines the use of an automated analysis tool on industrial software UML class models, where one set of models was created as part of the design process and the other was obtained from reverse engineering code. The analysis was performed by DesignAdvisor, a tool developed by Siemens Corporate research, that supports metrics-based analysis and detection of design guideline violations. The paper describes the lessons learned from using the automated analysis techniques to assess the quality of these models. We also assess the impact of design pattern use in the overall quality of the models. Based on our lessons learned, identify design guidelines that would minimize the occurrence of these errors. © Springer-Verlag Berlin Heidelberg 2005.

关键词： computer aided design

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Handling missing values via decomposition of the conditioned set

Handling missing values via decomposition of the conditioned...

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2005 IEEE International Conference on Information Reuse and Integration, IRI - 2005

作者： Shyu, Mei-Ling Kuruppu-Appuhamilage, Indika Priyantha Chen, Shu-Ching Chang, Li Wu Department of Electrical and Computer Engineering University of Miami Coral Gables FL 33124 United States Distributed Multimedia Information System Laboratory School of Computer Science Florida International University Miami FL 33199 United States Center for High Assurance Computer Systems Naval Research Laboratory Washington DC 20375 United States

ISBN: (纸本)0780390938

In this paper, a framework for replacing missing values in a database is proposed since a real-world database is seldom complete. Good data quality in a database can directly improve the performance of any data mining algorithm in various applications. Our proposed framework adopts the basic concepts from conditional probability theories and further develops an algorithm to facilitate the capability of handling both nominal and numerical values, which addresses the problem of the inability of handling both nominal and numerical values with a high degree of accuracy in the existing algorithms. Several experiments are conducted and the experimental results demonstrate that our framework provides a high accuracy when compared with most of the commonly used algorithms such as using the average value, using the maximum value, and using the minimum value to replace missing values. © 2005 IEEE.

关键词： Data handling

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End-to-end quality of service provisioning for nternet access via third generation wireless networks

End-to-end quality of service provisioning for nternet acces...

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作者： Jiang, Zhifeng Leung, Victor C. M. Department of Electrical and Computer Engineering University of British Columbia Canada Communication Technology Labs China Network Communication Group Beijing China Laboratory Beijing China Telus Mobility Research Department Department of Graduate Affairs IEEE

Large bandwidth, guaranteed quality of service (QoS), and ease of deployment, coupled with great advancements in semiconductor technologies for wireless devices make third generation (3G) wireless networks a very attractive solution for mobile users to access the Internet. 3G wireless networks will support interactive multimedia services, so QoS support is crucial. In this paper, we briefly survey 3G network architecture and specifications for supporting QoS, using UMTS as a specific example. We also identify the problems of end-to-end QoS provisioning in the context of UMTS interworking with other public networks that form the Internet. To address these problems, we present potential solutions based on existing Internet QoS provisioning schemes.

关键词： Internet

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Abstracts from the 6th International Conference on the engineering of Sport, 10-14 July 2006, Olympic Hall, Munich, Germany Abstracts

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SPORTS engineering 2006年第2期9卷 107-127页

作者： [Anonymous] University of Massachusetts Lowell USA Science & Mathematics Department Kettering University Flint USA University of Illinois USA Western Michigan University USA Washington State University USA Casecade Engine USA Kanazawa University Japan Sumitomo Light Metal Japan Massachusetts Institute of Technology USA Nanyang Technological University Bioengineering Singapore University of Vienna Anthropology Austria Department of Mechanical Engineering University of Bath UK INSA Lyon France PETZL France Sports Materials Research Group University of Birmingham UK Laboratoire de Modélisation des Activités Sportives Bourget du Lac France Technical University Kaiserslautern Germany Department of Engineering Mechanics United States Air Force Academy Colorado Springs USA SRAM Corporation Colorado Springs USA Sports Engineering Research Group University of Sheffield UK Sports Engineering CSES Sheffield Hallam University USA Sports Engineering CSES Sheffield Hallam University UK Technische Universität München Germany Rush University Medical Center Chicago USA Faculty of Sports Science Department of Sport Equipment & Materials TU München Germany RMIT University Australia Institute of Health and Sports Sciences University of Tsukuba Ibaraki Japan Machine and Control Department Polytechnic University Kanagawa Japan SRI Sports Ltd. Hyogo Japan SRI Research and Development Ltd. Hyogo Japan Mizuno Corporation Osaka Japan Fukuoka Institute of Technology Fukuoka Japan University of Limerick Éire Graduate School of Engineering Hokkaido University Japan Faculty of Engineering Kitami Institute of Technology Japan University of Calgary Canada TaylorMade-adidas Golf Company USA Davis Mechanical Engineering University of California USA Davis Mechanical & Aeronautical Engineering University of California USA University of Wales Institute Cardiff Cardiff School of Sport UWIC Cardiff Cardiff School of Sport UWIC Wales Loughborough University UK Cranfield University UK Cr

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The modeling and characterization of nano-scale MOSFET resistance

The modeling and characterization of nano-scale MOSFET resis...

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2005 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2005

作者： Lee, Jun-Ha Lee, Hoong-Joo Lee, Woo-Hee Kang, Eu-Seok Lee, Ju-Yul Byun, Ki-Ryang Kang, Jeong-Won Hwang, Ho-Jung Kwon, Oh-Keun Information Display Research Center Department of Computer System Engineering Sangmyung Univerisity Chonan Korea Republic of School of Electrical and Electronic Engineering Nano Electronic Future Technology Laboratory Chung-Ang University Seoul Korea Republic of Department of E-Commerce Semyung University Jecheon Korea Republic of

ISBN: (纸本)0976798522

The current drive in an MOSFET is limited by the intrinsic channel resistance. All the other parasitic elements in a device structure play a significant role and degrade the device performance. These other resistances need to be less than 10%-20% of the channel resistance. To achieve the requirements, we should investigate the methodology of separation and quantification of those resistances. In this paper, we developed the extraction method of resistances using calibrated TCAD simulation. The resistance of the extension region is also partially determined by the formation of a surface accumulation region that forms under the gate in the tail region of the extension profile. This resistance is strongly affected by the abruptness of the extension profile because the steeper the profile is, the shorter this accumulation region will be.

关键词： Nanostructured materials

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Guest editorial wireless overlay networks based on mobile IPv6

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IEEE Journal on Selected Areas in Communications 2005年第11期23卷 2089-2090页

作者： Chao, Han-Chieh Huang, Nen-Fu Kuo, Sy-Yen Perkins, Charles E. Stuttgen, Heinrich Bux, W. National Ilan University Department of Electronic Engineering I-Lan 260 Taiwan National Tsing Hua University Department of Computer Science Hsin-Chu 300 Taiwan National Taiwan University Department of Electrical Engineering Taipei 106 Taiwan Nokia Research Center Communication Systems Laboratory Mountain View CA 94043 United States NEC Europe Ltd. Network Laboratories Heidelberg D 69115 Heidelberg Germany Department of Electronic Engineering Taiwan Library and Information Technology Office National Ilan University I-Lan Taiwan IPv6 Steering Committee Taiwan Taiwan IPv6 Forum Taiwan Department of Computer Science National Tsing Hua University Taiwan IPv6 Working Group NICI Ipv6 Steering Committee IPv6 Forum Taiwan Department of Electrical Engineering National Taiwan University Taiwan Computer Science and Engineering Department Chinese University of Hong Kong Hong Kong IEEE Computer Society Networking Technology Laboratory Nokia Research Center Mountain View CA United States IEEE Vehicular Technology Conference Networking Track NEC Europe Ltd. Germany NEC's Network Laboratories Heidelberg Germany Board of Governors IEEE Communications Society Japan Department of ComSoc's Switching Routing Technical Committee

No abstract available

关键词： Internet Wireless networks Mobile computing computer networks Land mobile radio cellular systems Access protocols GSM Pervasive computing Mobile communication computer architecture

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On the sciences obtained from ADEOS-II mission

On the sciences obtained from ADEOS-II mission

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Sensors, systems, and Next-Generation Satellites IX

作者： Nakajima, Takashi Y. Sumi, Akimasa Imaoka, Keiji Kikuchi, Nobuyuki School of Engineering II Department of Network and Computer Engineering Tokai University 2-28-4 Tomigaya Shibuya-ku Tokyo 151-0063 Japan Center for Climate System Research University of Tokyo 5-1-5 Kashiwanoha Kashiwa Chiba 277-8568 Japan Earth Observation Research and Application Center JAXA 1-8-10 Harumi Chuo-ku Tokyo 104-6032 Japan

The scientific results, present status, and future plan of the ADEOS-II mission, especially for AMSR and GLI sensor, are presented in the paper. Five specific sensors aboard the ADEOS-II satellite were designed for making overall observation of land, atmosphere, ocean, and cryosphere from the sun-synchronous polar orbit. The AMSR and GLI are two of the primary sensors aboard the ADEOS-II satellite. The AMSR, a microwave scanner, retrieved the physical parameters related to global water cycle such as total precipitable water, cloud liquid water, precipitations and soil moisture. One the other hand, the GLI, a near ultraviolet to infrared imager, had captured many environmental events such as volcano eruptions, forest fires, and dust events with moderate spatial resolution of 250 m or 1 km. It also observed ocean colors, sea surface temperature, vegetation indices, aerosol and cloud properties, and precipitable water over land area. The ADEOS-II science activities continue in future. The primary objective of the next phase is the data utilization toward the future satellite missions, and the synergy of satellite data and climate models.

关键词： Satellite communication systems

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A Discontinuous Carrier-based PWM Modulation Method for the Control of the Neutral Point Voltage of Three-Phase Three-Level Diode Clamped Converters

A Discontinuous Carrier-based PWM Modulation Method for the ...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： O. Ojo S. Konduru Department of Electrical and Computer Engineering/Center for Energy System Research Laboratory for Electric Machines and Power Electronics Tennessee Technological University Cookeville TN USA

The neutral-point voltage of the three-level, three-phase converter is regulated using a hysteresis controller which selects the appropriate expression for the zero sequence voltage signal which augments the modulation signal used in the discontinuous carrier-based PWM modulation scheme for voltage control. The analytical expressions for the zero sequence voltages are generalized to three sets making its DSP implementation very easy. Simulation and experimental results verify the usefulness of the proposed neutral-point regulation technique

关键词： Pulse width modulation Pulse width modulation converters Voltage control Diodes Capacitors Space vector pulse width modulation Topology Control systems Phase modulation Stress

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A speed control of an interior permanent magnet motor drive ensuring minimum electrical loss

A speed control of an interior permanent magnet motor drive ...

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IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： O. Ojo Zhiqiao Wu Department of Electrical and Computer Engineering/Center for Energy System Research Laboratory for Electric Machines and Power Electronics Tennessee Technological University Cookeville TN USA

ISBN: (纸本)0780389875

Nonlinear input-output linearization with decoupling concepts are used to effect a high performance speed control of the interior permanent magnet motor drives which also achieves the minimization of the electrical losses - the copper and core losses. This control scheme is unique in that saturation dependent parameters such as the d and q axis inductances and the voltage dependent core loss resistance are all included in the controller structure formulation and implementation. The proposed control scheme differs from known schemes which are either based on perturbation and search methods or on steady state fitted graphs that map the command q and d axis currents based on reference torques. Here, an optimization formulation that dynamically determines the reference currents/voltages required to achieve high performance speed control and total electrical loss minimization is used. The control structure methodology, the nature of the variations of the machine parameters and how they influence the machine efficiency and performance are clearly laid out in experimental and computer simulation results

关键词： Velocity control Permanent magnet motors Performance loss Core loss Voltage control Copper Electric resistance Torque control Search methods Steady-state

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