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Over-current carrying characteristics of rectangular-shaped YBCO thin films prepared by MOD method

Journal of Physics: Conference Series 2008年第1期97卷

作者： Hotta, Naokatsu Yokomizu, Yasunobu Iioka, Daisuke Matsumura, Toshiro Kumagai, Toshiya Yamasaki, Hirohumi Shibuya, Masatoyo Nitta, Tanzo Department of Electrical Engineering and Computer Science Nagoya University Chikusa-ku Nagoya 464-8603 Furo-cho Japan Advanced Manufacturing Research Institute Advanced Industrial Science and Technology (AIST) AIST Tsukuba Central 5 Tsukuba Ibaraki 305-8565 Japan College of Engineering Kanto Gakuin University Kanazawa-ku Yokohama 236-8501 1-50-1 Mutsuurahigashi Japan Electric Power Engineering Research Laboratory Central Research Institute of Electric Power Industry (CRIEPI) Yokosuka Kanagawa 240-0196 2-6-1 Nagasaka Japan

A fault current limiter (FCL) may be manufactured at competitive qualities and prices by using rectangular-shaped YBCO films which are prepared by metal-organic deposition (MOD) method, because the MOD method can produce large size elements with a low-cost and non-vacuum technique. Prior to constructing a superconducting FCL (SFCL), AC over-current carrying experiments were conducted for 120 mm long elements where YBCO thin film of about 200 nm in thickness was coated on sapphire substrate with cerium oxide (CeO₂) interlayer. In the experiments, only single cycle of the ac damping current of 50 Hz was applied to the pure YBCO element without protective metal coating or parallel resistor and the magnitude of the current was increased step by step until the breakdown phenomena occurred in the element. In each experiment, current waveforms flowing through the YBCO element and voltage waveform across the element were measured to get the voltage-current characteristics. The allowable over-current and generated voltage were successfully estimated for the pure YBCO films. It can be pointed out that the lower n-value trends to bring about the higher allowable over-current and the higher withstand voltage more than tens of volts. The YBCO film having higher n-value is sensitive to the over-current. Thus, some protective methods such as a metal coating should be employed for applying to the fault current limiter. © 2008 IOP Publishing Ltd.

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Massive stripe cache and prefetching for massive file I/O

Massive stripe cache and prefetching for massive file I/O

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2007 Digest of Technical Papers International Conference on Consumer Electronics

作者： Sung, Hoon Baek Kyu, Ho Park Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology

ISBN: (纸本)142440763X

This paper presents a massive stripe prefetching (MSP) scheme on a massive stripe cache (MSC) structure, which has been implemented in a Linux kernel. Our schemes efficiently perform on massive files such as audio/video files and a bulk of small flies. MSC exploits spatial locality. MSP discriminates metadata reads and contiguous data reads in the stripe level, thereby boosting the read performance independently of a file-based prefetching. © 2007 IEEE.

关键词： Buffer storage

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Efficient parallel memory organization for turbo decoders

Efficient parallel memory organization for turbo decoders

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15th European Signal Processing Conference, EUSIPCO 2007

作者： Salmela, Perttu Gu, Ruirui Bhattacharyya, Shuvra S. Takala, Jarmo Institute of Digital and Computer Systems Tampere University of Technology Tampere Finland Department of Electrical and Computer Engineering Institute for Advanced Computer Studies University of Maryland College Park MD United States

ISBN: (纸本)9788392134022

An efficient turbo decoder must access memory in parallel and with two different access patterns. It is shown that the problem of accessing memory both with sequential and interleaved access patterns is analogous to the graph coloring problem. The derivation proves that the obtained graph is bipartite and, therefore, only two memory banks are required in theory. For practical implementations, a system with four memory modules and a buffer is proposed. It is shown that modest buffer length is sufficient for 3GPP standard interleavers. There is no performance degradation in the proposed system and the address generation and memory interfaces are of modest complexity. © 2007 EURASIP.

关键词： Decoding

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Band structure of ZnO from resonant x-ray emission spectroscopy

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Physical Review B 2008年第15期78卷 155114-155114页

作者： A. R. H. Preston B. J. Ruck L. F. J. Piper A. DeMasi K. E. Smith A. Schleife F. Fuchs F. Bechstedt J. Chai S. M. Durbin The MacDiarmid Institute for Advanced Materials and Nanotechnology Wellington 6140 New Zealand School of Chemical and Physical Sciences Victoria University of Wellington P.O. Box 600 Wellington 6140 New Zealand Department of Physics Boston University 590 Commonwealth Avenue Boston Massachusetts 02215 USA Institut für Festkörpertheorie und -optik Friedrich-Schiller-Universität Max-Wien-Platz 1 07743 Jena Germany Department of Electrical and Computer Engineering University of Canterbury Christchurch 8140 New Zealand

Soft x-ray emission and absorption spectroscopy of the O K-edge are employed to investigate the electronic structure of wurtzite ZnO(0001). A quasiparticle band structure calculated within the GW approximation agrees well with the data, most notably with the energetic location of the Zn 3d–O 2p hybridized state and the anisotropy of the absorption spectra. Dispersion in the band structure is mapped using the coherent k-selective part of the resonant x-ray emission spectra. We show that a more extensive mapping of the bands is possible in the case of crystalline anisotropy such as that found in ZnO.

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3D Monte Carlo simulation of transport in electro-statically confined silicon nanochannels

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physica status solidi c 2008年第1期5卷

作者： Mohamed Mohamed Pierre Martin Umberto Ravaioli Beckman Institute for Advanced Science and Technology and Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign 405 North Mathews Avenue Urbana Illinois 61801 USA

This study investigates transport and electrostatic behavior of quasi 1D nanowires adopting a relatively simple planar fabrication technique. The confined conduction channel is created by etching an oxide trench, realizing a T-gate structure. Since multiple channels are normally needed to realize sufficient current drive in practical applications, the behavior of single and coupled adjacent silicon nanowires is characterized using a 3D quantum corrected Monte Carlo approach. Results indicate that a single T-gate structure provides over 27% increase in current drive compared to conventional MOSFET at a drain voltage of 1 V . In addition, design consideration and recommendation is presented. Cross section of a T-gate MOSFET. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

关键词： 02.70.Uu 73.6299999999999954.−b 85.3499999999999943.−p

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Dual band Antennas using Metamaterial Transmission Lines

Dual band Antennas using Metamaterial Transmission Lines

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2008 IEEE Antennas and Propagation Society International Symposium (APSURSI 2008), vol.8

作者： Jae-Hyun Park Young-Ho Ryu Seung-Wook Lee Jeong-Hae Lee Eun-Seok Park Young-Eil Kim Department of Electronic Information and Communication Engineering Hongik University Seoul South Korea School of Electrical Engineering and Computer Science Kyungpook National University Daegu South Korea Embedded Systems Solution Laboratory Samsung Advanced Institute of Technology Yongin si Gyeonggi South Korea

ISBN: (纸本)9781424420414

The planar metamaterial transmission (MTL) line is a consequence of extraordinary permittivity and permeability. As it is known well, the composite right/left-handed (CRLH) transmission line (TL) has unique property of an infinite-wavelength wave at specific non-zero frequency because of zero permittivity and permeability [1-2]. Recently, the infinite wavelength resonator antenna based on the fundamental infinite wavelength property of artificial epsilon-negative (ENG) and mu-negative (MNG) TLs was also presented [3-4]. In this paper, dual band antennas using epsilon zero resonance (EZR) and mu zero resonance (MZR) are presented. Since an infinite wavelength of artificial ENG and MNG TLs occurs when their permittivity and permeability are zero, the resonance frequency does not depend on its electrical length. To design dual-band antennas, two ENG and MNG resonators with different resonance frequency which supports the infinite wavelength are analyzed. The resulting characteristics of dual band antennas using the metamaterial TLs will be presented.

关键词： dual band antennas resonant frequencies left-handed materials Electronystagmography Dielectric constant Transmission Lines Infinite wavelengths Zero Permeability

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Fabrication of multi-layered carbon nanotube films for label-free detection of DNA hybridization 11

Fabrication of multi-layered carbon nanotube films for label...

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11th International Conference on Miniaturized Systems for Chemistry and Life Sciences, uTAS 2007

作者： Baek, Youn-Kyoung Jung, Dae-Hwan Lee, Sang-Yup Choi, Yang-Kyu Jung, Hee-Tae Department of Chemical and Biomolecular Engineering and Computer Science Korea Advanced Institute of Science and Technology Korea Republic of Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Korea Republic of

ISBN: (纸本)9780979806407

We immobilized the probe DNA oligonucleotides onto single wall carbon nanotube(SWNT) films and hybridized target DNA oligonucleotides with the complementary or non-complementary bases, in which SWNT films with a wide range of conductivities were prepared by vacuum filtration methods. Single strand DNA oligonucleotides were covalently attached to prepatterned films through amide bond formation using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride. Sensing ability of the DNA hybridization was demonstrated by investigating a change of response to linked DNA and its complementarity. We show that resultant DNA-attached CNT multilayer films are shown to exhibit good specificity for their potential use in biosensors. © 2007 CBMS.

关键词： DNA

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Confidentiality-preserving rank-ordered search

Confidentiality-preserving rank-ordered search

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2007 ACM Workshop on Storage Security and Survivability, StorageSS'07

作者： Swaminathan, Ashwin Mao, Yinian Su, Guan-Ming Gou, Hongmei Varna, Avinash L. He, Shan Wu, Min Oard, Douglas W. Department of Electrical and Computer Engineering College Park MD 20742 United States College of Information Studies Institute for Advanced Computer Studies University of Maryland College Park MD 20742 United States

ISBN: (纸本)9781595938916

This paper introduces a new framework for confidentiality preserving rank-ordered search and retrieval over large document collections. The proposed framework not only protects document/query confidentiality against an outside intruder, but also prevents an untrusted data center from learning information about the query and the document collection. We present practical techniques for proper integration of relevance scoring methods and cryptographic techniques, such as order preserving encryption, to protect data collections and indices and provide efficient and accurate search capabilities to securely rank-order documents in response to a query. Experimental results on the W3C collection show that these techniques have comparable performance to conventional search systems designed for non-encrypted data in terms of search accuracy. The proposed methods thus form the first steps to bring together advanced information retrieval and secure search capabilities for a wide range of applications including managing data in government and business operations, enabling scholarly study of sensitive data, and facilitating the document discovery process in litigation. Copyright 2007 ACM.

关键词： Sensitive data

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Many-body excitations in the tunneling current spectra of a few-electron quantum dot

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Physical Review B 2008年第16期77卷 165340-165340页

作者： D. V. Melnikov T. Fujisawa D. G. Austing S. Tarucha J.-P. Leburton Beckman Institute for Advanced Science and Technology and Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign 405 North Mathews Avenue Urbana Illinois 61801 USA NTT Basic Research Laboratories NTT Corporation Atsugi-shi Kanagawa 243-0198 Japan and Tokyo Institute of Technology 2-12-1 Okayama Meguro-ku Tokyo 152-8551 Japan Institute of Microstructural Sciences M50 National Research Council of Canada Montreal Road Ottawa Ontario Canada K1A 0R6 ICORP Spin Information Project JST Atsugi-shi Kanagawa 243-0198 Japan and Department of Applied Physics University of Tokyo Hongo Bunkyo-ku Tokyo 113-8656 Japan

Inherent asymmetry in the tunneling barriers of few-electron quantum dots induces intrinsically different tunneling currents for forward and reverse source-drain biases in the nonlinear transport regime. We demonstrate that in addition to spin selection rules, overlap matrix elements between many-body states are crucial for the correct description of tunneling transmission through quantum dots at large magnetic fields. Signatures of excited (N−1)-electron states in the transport process through the N-electron system are clearly identified in the measured transconductances. Overall, the computed current spectra are found to be in very good agreement with the experimental data.

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Semantic business registry information model

Semantic business registry information model

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2nd International Conference on Convergent Information Technology, ICCIT 07

作者： Yohan, Roh Hangkyu, Kim Hak, Soo Kim Myoung, Ho Kim Jin, Hyun Son Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Taejon Korea Republic of Department of Computer Science and Engineering Hanyang University Ansan Korea Republic of

ISBN: (纸本)0769530389

For the intelligent business process management, ebXML registry needs to efficiently store and process semantic information. Even though ebXML registry provides two basic information models to define and associate semantics between registry objects;e.g., classification information model and association information model, they cannot express all semantics of the standard web ontology language (OWL) due to their generic differences in design goals and usage patterns. To support OWL semantics in ebXML registries is to provide a foundation for intelligent information processing in ebXML registries. In this paper, we address how to embed OWL semantics in the ebXML registry. To express OWL constructs in ebXML registries, we propose a new ebXML registry information model, i.e., a semantic information model (SIM). © 2007 IEEE.

关键词： Semantics

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