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20th Congress of the International Commission for Optics

作者： Noriaki Miura Naoki Kodama Hiroshi Ohkama Hideaki Odagiri Naoshi Baba Hiroshi Kita Reizaburou Kitai Satoru Ueno Kiyoshi Ichimoto Takashi Sakurai Kitami Institute of Technology Department of Computer Sciences 165 Koen-cho Kitami 090-8507 Japan. Kitami Institute of Technology Department of Computer Sciences 165 Koen-cho Kitami 090-8507 Japan. Muroran Institute of Technology Department of Electrical and Electric engineering 27-1 Mizumoto-cho Muroran 050-8585 Japan. Muroran Institute of Technology Department of Electrical and Electric engineering 27-1 Mizumoto-cho Muroran 050-8585 Japan. Hokkaido University Department of Applied Physics Faculty of Engineering Sapporo 060-8628 Japan. Hokkaido University Department of Applied Physics Faculty of Engineering Sapporo 060-8628 Japan. Hida Observatory School of Science Kyoto University Kamitakara Takayama 506-1314 Japan. Hida Observatory School of Science Kyoto University Kamitakara Takayama 506-1314 Japan. National Astronomical Observatory 2-21-1 Ohsawa Mitaka 181-8588 Japan. National Astronomical Observatory 2-21-1 Ohsawa Mitaka 181-8588 Japan.

This paper describes a PC-cluster-based observation system for improving the angular resolution of solar images. The system consists of two equipments separately working: one equipment realizes automa

关键词： Solar image improvement, blind deconvolution, superresolution, PC cluster

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Network coding for wireless applications

Network coding for wireless applications

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Unmanned/Unattended Sensors and Sensor Networks II

作者： Lun, Desmond S. Ahmed, Ebad Brothers, L. Reggie DeBardelaben, James A. Effros, Michelle Ho, Tracey Karger, David Koetter, Ralf Lee, Anna MacMullan, Samuel J. Médard, Muriel Zhao, Fang Laboratory for Information and Decision Systems Massachusetts Institute of Technology Cambridge MA 02139 United States DARPA ATO 3701 N. Fairfax Dr. Arlington VA 22203 United States Johns Hopkins University Applied Physics Laboratory 11100 Johns Hopkins Rd. Laurel MD 20769 United States Data Compression Laboratory California Institute of Technology Pasadena CA 91125 United States Department of Electrical Engineering California Institute of Technology Pasadena CA 91125 United States Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology Cambridge MA 02139 United States Coordinated Science Laboratory University of Illinois at Urbana-Champaign Urbana IL 61801 United States Lorenz Research Associates Inc. 4443 Brookfield Corporate Dr. Chantilly VA 20151 United States

The advent of network coding promises to change many aspects of networking. Network coding moves away from the classical approach of networking, which treats networks as akin to physical transportation systems. We overview some of the main features of network coding that are most relevant to wireless networks. In particular, we discuss the fact that random distributed network coding is asymptotically optimal for wireless networks with and without packet erasures. These results are extremely general and allow packet loss correlation, such as may occur in fading wireless channels. The coded network lends itself, for multicast connections, to a cost optimization which not only outperforms traditional routing tree-based approaches, but also lends itself to a distributed implementation and to a dynamic implementation when changing conditions, such as mobility, arise. We illustrate the performance of such optimization methods for energy efficiency in wireless networks and propose some new directions for research in the area.

关键词： Signal encoding

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Development of QTAT online electronic circuit patterning system

Development of QTAT online electronic circuit patterning sys...

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作者： Wakasugi, Katsuhiko Wakimoto, Satoshi Akamichi, Takayuki Nakada, Akira Kubota, Hiroshi Inokuchi, Tsuneo Suzuki, Shinji Aikawa, Sou Kosaka, Kouji Nakamura, Kazumitsu Morimoto, Tatsuo IEEE Graduate School of Science and Technology Kumamoto University Kumamoto 860-8555 Japan Kumamoto Technology Center Sony Semiconductor Kyushu Corporation Kumamoto 869-1102 Japan Ushio Inc. Yokohama 225-0002 Japan Tecnos Co. Ltd. Nara 630-8113 Japan Kumamoto Technology Inc. Kumamoto 861-2202 Japan Kumamoto Technology and Industry Foundation Kumamoto 861-2202 Japan New Industry Creation Hatchery Center Tohoku University Sendai 980-8579 Japan Japan Society of Applied Physics Institute of Electronics Information and Communication Engineering Department of Electrical and Computer Engineering Faculty of Engineering Kumamoto University Graduate School of Science and Technology Kumamoto University Shock Wave and Condensed Matter Research Center Kumamoto University Sony Semiconductor Kyushu Corporation Kagoshima Japan Sony Semiconductor Kyushu Corporation Kumamoto Technology Center Kumamoto Japan Department of Electronic Engineering Tokyo University of Agriculture and Technology Tokyo Tecnos Co. Ltd. Nara Japan Tokyo Technology Co. Ltd. Tokyo Japan Kumamoto Technology Co. Ltd. Kumamoto Japan Japan Society of Precision Engineering Kumamoto Technology and Industry Foundation Kumamoto Japan American Vacuum Society New Industry Creation Hatchery Center Tohoku University

An arbitrary pattern exposure system has been developed by employing a liquid crystal display (LCD) with 1600 × 1200 pixels for the formation of projection images in place of a conventional reticle. The minimum pattern size becomes 11.5 μm, which corresponds to the aperture size of each pixel on the LCD. For the purpose of quick turnaround time (TAT), the exposure system was directly connected to the circuit design system with the transmission control protocol/internet protocol network. From the experimental results on patterning of a typical electronic circuit data with the area of 46 × 46 mm, it was confirmed that the TAT from the output of design data to the finish of the exposure becomes less than 28 min. By using this system, reduction of the production cost in the printed wiring boards fabrication is expected. © 2005 IEEE.

关键词： Online systems

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Nanophysics of electron dynamics near surfaces in high power microwave devices and systems

NanoPhysics of electron dynamics near surfaces in high power...

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IVESC2004 - 5th International Vacuum Electron Sources Conference Proceedings

作者： Luhmann Jr., N.C. Caryotakis, G. Heritage, J.P. Umstadd, R. Department of Applied Science University of California Davis Electrical and Computer Engineering University of California Davis Department of Physics Naval Postgraduate School Monterey CA

ISBN: (纸本)0780384377

High-density vertically aligned nanotube towers and gated individual nanotube field emitters were used to study the electron dynamics near surfaces in high power microwave device and systems. Triode-like gated individual nanotube field emitters was developed by performing controlled synthesis to grow individual vertical nanotubes at desired sites. A comprehensive experimental and computational program was implemented to investigate the RF breakdown issue. The experimental arrangement was used in a previous Multidisciplinary University Research Initiative (MURI) program and was found to be much more effective than an earlier method of inserting the cavity in a resonant ring to provide the required sustained power.

关键词： Nanotechnology

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Finite element modeling of ultrasonic separation at the microscale

Finite element modeling of ultrasonic separation at the micr...

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2004 IEEE Ultrasonics Symposium

作者： Araz, Muhammet Kürşad Lee, Chung-Hoon Lal, Amit Applied and Engineering Physics Cornell University Ithaca NY Veeco Probes Santa Barbara CA Electrical and Computer Engineering Department Son/cMEMS Lab Cornell University Ithaca NY

In this paper, working principle of the acoustic chromatography device is investigated by the analytical and Finite Element Modeling (FEM) approach. Analytical and simulation results compared to the inteferometric scan and the experimental results confirm that the inertial field due to the flexural waves on the capillary has the major role for manipulation of particles. Disagreement between phase velocity from the simple beam bending solution and experiments at high frequencies are also discussed. ©2004 IEEE.

关键词： Ultrasonics

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Optimization of bi-periodic photonic crystal waveguides for optical integrated circuits

Optimization of bi-periodic photonic crystal waveguides for ...

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Frontiers in Optics, FiO-2004

作者： Jafarpour, Aliakbar Adibi, Ali Lee, Reginald K. Xu, Yong School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA30332-0259 United States Department of Applied Physics California Institute of Technology PasadenaCA91125 United States

ISBN: (纸本)1557527792

A second period i it yof the dielectric constant adjacent to the core of photon it crytal wavegu ides shifts tge peak of distributed Bragg reflections toward the edge of the proton it *** report here, the complete investigation of mode spectrum in these wavegu ides to explain different features of the experimental resuIts. © 2004 OSA/FIO 2004

关键词： Timing circuits

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Sm(Co, Fe, Cu, Zr, C)8.2 ribbons for high-temperature magnets

Sm(Co, Fe, Cu, Zr, C)8.2 ribbons for high-temperature magnet...

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作者： Makridis, Sofoklis S. Litsardakis, George Efthimiadis, Kostas G. Höfinger, Sabine Fidler, Josef Niarchos, Dimitris Department of Electrical and Computer Engineering Aristotle University GR-54124 Thessaloniki Greece Department of Physics Aristotle University Thessaloniki 54124 Greece Institute of Applied and Technical Physics Vienna University of Technology A-1040 Vienna Austria Institute of Materials Science NCSR Demokritos 15310 Athens Greece

The effect of carbon substitution for cobalt on the structure and magnetic properties at room and high temperature of melt spun ribbons with composition Sm(Co0.86-xFe0.1Zr0.04Cx)8.2 and Sm(Co0.74-xFe0.1Cu0.12Zr0.04C x)8.2 (x = 0 - 0.015) has been studied. Arc-melted bulk samples have Th2Ni17-type structure while ribbons have TbCu7-type structure. Average grain size for Cu-free sample with x = 0.005 is 23 nm while for Cu-doped samples it varies from 53 to 22 nm when x varies from 0.005 to 0.015, respectively. Coercive as-spun samples have H c∼2.2-7.8kOe and reduced remanence mr= M r/Ms up to 0.74. Ribbons of the Cu-free composition with x = 0 and 0.005 and annealed at 750°C for 1 h have TbCu7-type structure with coercivity values 4.9 and 3.0 kOe respectively, while for x = 0.01 and 0.015, FCC-Co is the dominant phase. Cu-doped ribbons with x = 0.005, after annealing at 750°C for 2h, are characterized at room temperature by square hysteresis loop with Hc = 8.3 kOe, reduced remanence m r = 0.75 and (BH)max = 6.3 MGOe. Loops at higher temperatures are also square with high mr;for x = 0.01 the magnetization is 89 emu/g and the coercive field is 1.8 kOe at 400°C. © 2004 Elsevier B.V. All rights reserved.

关键词： Magnets

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Non-Equilibrium Acceptor Concentration in GaN:Mg Grown by Metalorganic Chemical Vapor Deposition

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MRS Online Proceedings Library 2004年第1期798卷 448-453页

作者： Y. Gong Y. Gu Igor L. Kuskovsky G. F. Neumark J. Li J. Y. Lin H. X. Jiang I. Ferguson Department of Applied Physics and Applied Mathematics Columbia University New York USA Department of Physics Kansas State University Manhattan USA School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta USA

It is shown that the high p-type conductivity in GaN:Mg, grown by metal-organic chemical vapor deposition followed by post-growth annealing, is due to non-equilibrium acceptor concentrations. A series of samples cut from a single GaN:Mg wafer, which initially had undergone rapid thermal annealing (RTA) after growth, has been investigated. The samples were annealed at various temperatures in nitrogen ambient for over 12 hours, and temperature-dependent Hall effect measurements were performed. For samples annealed at temperatures higher than 850°C, the hole concentrations decrease by at least an order of magnitude, compared with the original sample. This behavior is explained by an Mg acceptor concentration in excess of its equilibrium solubility limit in the original sample; thus, at high enough temperatures, in the absence of hydrogen, Mg acceptors diffuse either to form electrically inactive precipitates or are eliminated. It is worth noting that the acceptor activation energy remains the same for all samples.

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Toward building a robust and intelligent video surveillance system: A case study

Toward building a robust and intelligent video surveillance ...

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2004 IEEE International Conference on Multimedia and Expo (ICME)

作者： Chang, Edward Y. Wang, Yuan-Fang Wang, I.-Jeng Department of Electrical Engineering University of California Santa Barbara CA 93106 Department of Computer Science University of California Santa Barbara CA 93106 Applied Physics Laboratory Johns Hopkins University 11100 Johns Hopkins Road Laurel MD 20723

ISBN: (纸本)0780386035

With the proliferation of inexpensive cameras, availability of large-capacity disk storages, and ubiquitous presence of high-speed, broad-band communication networks, it is now economically and technically feasible to construct and deploy multi-camera video surveillance systems. In line with this is the need of intelligent, robust, (semi-)automated video analysis paradigms to assist the operators in scene analysis and event classification. In this paper, we summarize our current research work toward realizing such a multi-camera video surveillance system. Interested readers can visit our web sites http://***/∼echang and http://***/∼yfwang for more information.

关键词： Video signal processing

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Onset of synchronization in systems of globally coupled chaotic maps

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Physical Review E 2004年第6期69卷 066210-066210页

作者： Seung-Jong Baek Edward Ott Department of Electrical and Computer Engineering Institute for Research in Electronics and Applied Physics University of Maryland College Park Maryland 20742 USA Department of Physics University of Maryland College Park Maryland 20742 USA

We study the transition to coherence of an ensemble of globally coupled chaotic maps allowing for ensembles of nonidentical maps and for noise. The transition coupling strength is determined from a kind of transfer function of the perturbation evolution. We present analytical results, and we test these results using numerical experiments for several large systems consisting of ensembles of many coupled maps. The later includes ensembles of identical noiseless maps, identical maps subject to noise, and ensembles of nonidentical maps. One of our examples suggests that the validity of the perturbation theory approach can be problematic for an ensemble of noiseless identical maps if the maps are nonhyperbolic. However, for such a case, noise and/or parameter spread seems to have a regularizing effect restoring the validity of perturbation theory.

关键词： Synchronization

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