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An improvement on binary-swap compositing for sort-last parallel rendering

An improvement on binary-swap compositing for sort-last para...

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Proceedings of the 2003 ACM Symposium on Applied Computing

作者： Takeuchi, Akira Ino, Fumihiko Hagihara, Kenichi Department of Informatics Grad. School of Engineering Science Osaka University 1-3 Machikaneyama Toyonaka Osaka 560-8531 Japan Department of Computer Science Grad. Sch. of Info. Sci./Technology Osaka University 1-3 Machikaneyama Toyonaka Osaka 560-8531 Japan

Sort-last parallel rendering is a good rendering sch.me on distributed memory multiprocessors. This paper presents an improvement on the binary-swap (BS) method, which is an efficient image compositing algorithm for sort-last parallel rendering. Our compositing method uses three acceleration techniques, compared to the original BS method. Through the use of the three techniques, our method balances the compositing load among processors, exploits more sparsity of the image, and reduces the cost of communication. We also show some experimental results on a PC cluster. The results show that our method completes the image compositing faster than the original BS method, and its speedup to the original increases with the number of processors.

关键词： Multiprocessing systems

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Wide-angle radar imaging using time-frequency distributions

Wide-angle radar imaging using time-frequency distributions

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作者： Lanterman, A.D. Munson Jr., D.C. Wu, Y. Sch. of Elec./Computer Engineering Georgia Institute of Technology Mail Code 0250 Atlanta GA 30332 United States Coordinated Science Laboratory Department of Electrical Engineering Univ. Illinois at Urbana-Champaign Urbana IL 61801 United States DSO National Laboratories Singapore 118230 Singapore

Low-frequency radar systems provide some attractive advantages in a few niche applications, such as foliage penetration and covert operation. In low-frequency imaging systems, data must be collected over a wide range of angles to obtain cross-range resolution comparable to that obtainable from a competing small-angle high-frequency system. The reflectivity of a target varies with aspect angle;although this variation is usually ignored by traditional radar imaging algorithms, it sometimes cannot be neglected in wide-angle scenarios. To account for aspect dependence of reflectivity, time-frequency transforms have been invoked to generate a series of images corresponding to different look angles;these images may be considered individually or synthesised into a single image. A simple theoretical analysis with a point scatter illustrates why the angular dependence needs explicit consideration. The potential of time-frequency methods is illustrated via simulations.

关键词： Radar

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Equilibrium analysis of lattice-mismatched nanowire heterostructures

Equilibrium analysis of lattice-mismatched nanowire heterost...

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Quantum Confined Semiconductor Nanostructures

作者： Ertekin, E. Greaney, P.A. Sands, T.D. Chrzan, D.C. Dept. of Materials Science and Eng. University of California Berkeley Berkeley CA United States Materials Science Division Lawrence Berkeley National Lab. Berkeley CA United States School of Materials Engineering Sch. of Electrical and Computer Eng. Purdue University West Lafayette IN United States

The quality of lattice-mismatched semiconductor heterojunctions is often limited by the presence of misfit dislocations. Nanowire geometries offer the promise of creating highly mismatched, yet dislocation free heterojunctions. A simple model, based upon the critical thickness model of Matthews and Blakeslee for misfit dislocation formation in planar heterostructures, illustrates that there exists a critical nanowire radius for which a coherent heterostructured nanowire system is unstable with respect to the formation of misfit dislocations. The model indicates that within the nanowire geometry, it should be possible to create perfect heterojunctions with large lattice-mismatch.

关键词： Heterojunctions

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EPOCHS: Integrated commercial off-the-shelf software for agent-based Electric Power and Communication Simulation

EPOCHS: Integrated commercial off-the-shelf software for age...

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Proceedings of the 2003 Simulation Conference: Driving Innovation

作者： Hopkinson, Kenneth M. Birman, Kenneth P. Giovanini, Renan Coury, Denis V. Wang, Xiaoru Thorp, James S. Computer Science Department Cornell University Ithaca NY 14853 United States Department of Electrical Engineering Sch. of Eng. at São Carlos University of São Paulo São Carlos SP 13566-590 Brazil School of Electrical Engineering Cornell University Ithaca NY 14853 United States

This paper reports on the development of the Electric Power and Communication Synchronizing Simulator (EPOCHS), a distributed simulation environment. Existing electric power simulation tools accurately model power systems of the past, which were controlled as large regional power pools without significant communication elements. However, as power systems increasingly turn to protection and control systems that make use of computer networks, these simulators are less and less capable of predicting the likely behavior of the resulting power grids. Similarly, the tools used to evaluate new communication protocols and systems have been developed without attention to the roles they might play in power scenarios. EPOCHS utilizes multiple research and commercial off-the-shelf (COTS) systems to bridge the gap. EPOCHS is also notable for allowing users to transparently encapsulate complex system behavior that bridges multiple domains through the use of a simple agent-based framework.

关键词： Electric power systems

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Pulsed Laser Deposition of Aluminum Tris-8-hydroxyquinline and TPD Thin Films

Pulsed Laser Deposition of Aluminum Tris-8-hydroxyquinline a...

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Organic and Polymeric Materials and Devices

作者： Ebihara, Kenji Shin, Pail-Kyun Ohshima, Tamiko Kurihara, Hiroshi Ikegami, Tomoaki Yamaguchi, Toshihisa Sakai, Takamasa Dept. of Elec. Computer Engineering Grad. Sch. of Science and Technology Kumamoto University 2-39-1 Kurokami Kumamoto 860-8555 Japan Kumamoto Technol./Indust. Foundation 2081-10 Tahara Mashiki 861-2202 Japan

Thin films of low molecular weight electroluminescence (EL) materials, Alq3 (aluminum tirs-8-hydoroxyquinline), TPD (N, N′-diphenyl-N, N′-bis (3methylphenyl)-(1, 1′-biphenyle)-4, 4′-diamine) were deposited by pulsed laser ablation (PLA) method using KrF excimer laser and Nd: YAG laser. Optical absorption property, surface morphology and photoluminescence of the films were investigated. Alq3 films by Nd:YAG laser show slight absorption at around 400 nm, and TPD films by either KrF laser or Nd:YAG laser showed absorption at 320 nm and 360 nm. It was found that TPD thin films for EL devices can be deposited by PLA method usig Nd:YAG laser.

关键词： Thin films

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SIP session-based access to bluetooth application profiles

SIP session-based access to bluetooth application profiles

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Proceedings of the Third IASTED International Conference on Wireless and Optical Communications

作者： Liscano, Ramiro Hu, Hao Jost, Allan Sch. of Info. Technol./Engineering University of Ottawa Ottawa Ont. K1N 6N5 Canada Faculty of Computer Science Dalhousie University Dalhousie NS B3H 1W5 Canada

ISBN: (纸本)0889863741

An approach is presented for the service discovery of Bluetooth application profiles during a SIP-based communication session. A system architecture and methodology is presented that leverages the IETF SIP protocol in order trigger a service discovery request between the end points in a session. The end points may support a Wireless Personal Area Network (WPAN) like Bluetooth, so that the end effect is the extension of the WPAN network across the Internet in a controlled and managed manner. The result is a mechanism that can support the exchange of Bluetooth service profiles between Bluetooth devices, a Bluetooth device and a PC, and/or a Bluetooth device and an IR device located at the end points of an IP network.

关键词： Wireless telecommunication systems

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ARC: An Integrated Admission and Rate Control Framework for CDMA Data Networks Based on Non-Cooperative Games

ARC: An Integrated Admission and Rate Control Framework for ...

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Proceedings of the Ninth Annual International Conference on Mobile Computing and Networking, MobiCom 2003

作者： Lin, Haitao Chatterjee, Mainak Das, Sajal K. Basu, Kalyan Ctr. Res. Wireless Mobility/N. Dept. of Comp. Sci. and Engineering University of Texas at Arlington Arlington TX 76019-0015 United States Sch. of Elec. Eng./Computer Science University of Central Florida Orlando FL 32816-2450 United States

ISBN: (纸本)9781581137538

The competition among wireless data service providers brings in an option for the customers to switch their providers, due to unsatisfactory service or otherwise. However, the existing resource management algorithms for wireless networks fail to fully capture the far-reaching impact of this competitiveness. From this perspective, we propose an integrated admission and rate control (ARC) framework for CDMA based wireless data networks. The admission control is at the session (macro) level while the rate control is at the link layer packet (micro) level. The ARC framework is based on a novel game theoretic formulation which defines non-cooperative games between the service providers and the customers. A user's decision to leave or join a provider is based on a finite set of strategies. A service provider can also construct its game strategy set so as to maximize the utility (revenue) yet attaining its target churn rate (the probability of users leaving the network). We show that the pure strategy Nash equilibrium can be established for both under-loaded and fully-loaded systems such that the providers have clearly defined admission criteria as outcome from this game. Users are categorized into multiple classes and offered differentiated services based on the price they pay and the service degradation they can tolerate. We show that the proposed ARC framework significantly increases the provider's revenue and also successfully offers differentiated QoS to the users.

关键词： computer networks

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Design and Implementation of Reduced GIS Data Format and Basic System based on Mobile Environments

Design and Implementation of Reduced GIS Data Format and Bas...

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Proceedings of the International Conference on Wireless Networks, ICWN'03

作者： Kim, Chang-Soo Kim, Seong Pyo Dept. of Computer Science PuKyong National University 599-1 Daeyeon3-Dong Nam-gu Busan 608-737 Korea Republic of Sch. of Interdisc. Comp./Engineering University of Missouri-Kansas City 5100 Rockhill Rd Kansas City MO 64110 United States

ISBN: (纸本)1932415041

Mobile computing environments have serious limitations such as small capacity of memory in spite of many advantages. To overcome these limitations of mobile environments, we propose a very reduced GIS (Geographic Information Service) data format for NGI(National Geography Institute) digital map of Korea, and we implement digital map guidance system which can be usable in PDA environments based on the proposed GIS data format. The implemented system is a client-oriented GIS browser that can execute most of functions in client environments and excludes receipt of digital map of another regions and information exchange such traffic information between server and clients. We suggest message format for information exchange in network module, and also include GPS procedure functions for coordinate conversion.

关键词： Geographic information systems

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A study on the receiving signal level in relation with the location of electrodes for wearable devices using human body as a transmission channel

A study on the receiving signal level in relation with the l...

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2003 IEEE International Antennas and Propagation Symposium and USNC/CNC/URSI North American Radio science Meeting

作者： Fujii, Katsuyuki Ito, Koichi Tajima, Shigeru Grad. Sch. of Science and Technology Chiba University 1-33 Yayoi-cho Inage-ku Chiba 263-8522 Japan Faculty of Engineering Chiba University 1-33 Yayoi-cho Inage-ku Chiba 263-8522 Japan Sony Computer Science Labs. Inc. 3-14-13 Higashigotanda Shinagawa-ku Tokyo 141-0022 Japan

Studies of wearable computers have attracted public attention in these days. And one of the area of interest is the communication system adopted in those wearable computers. As an example, wearable devices which use the human body as a transmission channel, have been developed. This communication system uses near field region of the electromagnetic wave generated by the device which is eventually coupled to human body by electrodes. Hence, the structure of electrodes is one of the key issues for the transmission using human body. However, little is known about the transmission mechanism of such devices in the physical layer [1-3]. In this paper, we propose calculation models of the transmitter and the receiver attached to the arm using the FDTD method. From this model, we estimated the difference in the received signal level due to the electrode structures of the transmitter and the receiver under various conditions. Moreover, in order to verify the validity of these calculation models, we compared the calculated received signal levels to the measured ones by using the biological tissue-equivalent phantom [4] with the transmitter and the receiver. The result shows a good agreement of the calculated and measured received signal levels. In addition, it is found that the GND electrode of the transmitter strengthens the generated electric field around the arm. However, the existence of a GND electrode for the receiver reduces the received signal level.

关键词： Wearable computers

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Spectral Image Acquisition with Rewritable Color Filters

Spectral Image Acquisition with Rewritable Color Filters

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Final Program and Proceedings of the PICS Conference: The Digital Photography Conference

作者： Hauta-Kasari, Markku Miyazawa, Kanae Toyooka, Satoru Parkkinen, Jussi Jaaskelainen, Timo Department of Computer Science University of Joensuu P.O.Box 111 FIN-80101 Joensuu Finland Department of Physics University of Joensuu P.O.Box 111 FIN-80101 Joensuu Finland Grad. Sch. of Sci. and Engineering Saitama University 255 Shimo-okubo Saitama 338-8570 Japan

We present techniques for spectral image acquisition. The spectral domain of the images is represented by a low-dimensional component image set, which is used to obtain an efficient compression of the high-dimensional spectral data. First, computational techniques to design color filters with a constraint of positive spectral values is described. Then, we present two prototypes of our spectral imaging systems that can be used to acquire the low-dimensional component image set optically through rewritable color filters. The first prototype is based on a spectral synthesizer that illuminates the sample with the light corresponding to a wanted color filter. The second prototype is based on a linear variable filter (LVF) and a liquid crystal spatial light modulator (LCSLM) that implements the rewritable color filter in front of a CCD-camera. We also show how liquid crystal tunable filter (LCTF) based system can be used to implement arbitrary color filters. The optically acquired component image set can be used for computational spectral image reconstruction or it can be directly used for pattern recognition tasks.

关键词： Color image processing

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