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Optical Fiber Communication (OFC) Conference

作者： R. Grover P.P. Absil V. Van J.V. Hryniewicz B.E. Little O. King F.G. Johnson L.C. Calhoun P.-T. Ho Laboratory for Physical Sciences College Park MD USA Department of Electrical and Computer Engineering University of Maryland College Park MD USA University System of Maryland Adelphi MD US Lab. for Phys. Sci. College Park MD USA

Single transverse mode vertically coupled semiconductor microring resonators were made using a novel fabrication technique without regrowth. GaAs-AlGaAs and GaInAsP-InP devices are demonstrated.

ISBN: (纸本)1557526559

Single transverse mode vertically coupled semiconductor microring resonators were made using a novel fabrication technique without regrowth. GaAs-AlGaAs and GaInAsP-InP devices are demonstrated.

关键词： Optical resonators Gallium arsenide Indium phosphide Polymers Polarization Etching Optical filters Refractive index Tellurium Resonance

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Vision expert system 3D-IMPRESS for automated construction of three dimensional image processing procedures

Vision expert system 3D-IMPRESS for automated construction o...

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International Conference on Virtual systems and MultiMedia

作者： Xiang-Rong Zhou A. Shimizu J. Hasegawa J. Toriwaki T. Hara H. Fujita Virtual System Laboratory Gifu University Gifu Japan Graduate School of Bio-Applications and Systems Engineering Tokyo University of Agriculture and Technology Tokyo Japan School of Computer and Cognitive Sciences Chukyo University Toyota Japan Department of Information Engineering University of Nagoya Nagoya Japan Department of Information Science Gifu University Gifu Japan

ISBN: (纸本)0769514022

In this paper a three dimensional (3D) image processing expert system called 3D-IMPRESS is presented. This system can automatically construct a 3D image processing procedure by using pairs of an original input image and a desired output figure called sample figure given by a user This paper describes the outline of 3D-IMPRESS and presents a method of procedure consolidation for generating a procedure commonly applicable to some other 3D gray images. Finally, we show segmentation results of 3D chest CT images by using the procedures generated by 3D-IMPRESS and discuss the performance of the system.

关键词： Machine vision Expert systems Image processing Computed tomography Agricultural engineering Image segmentation Laboratories systems engineering and theory Agriculture Biomedical engineering

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High repetition rate flat-topped pulse trains from an arrayed wavegulde grating

High repetition rate flat-topped pulse trains from an arraye...

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Conference on Lasers and Electro-Optics (CLEO)

作者： D.E. Leaird A.M. Weiner S. Shen A. Sugita S. Kamei H. Yamada M. Ishii K. Okamoto Center for Education and Research in Information Assurance and Security CERIAS Purdue University Indianapolis West Lafayette IN USA Purdue University System West Lafayette IN US Lucent Technologies Inc. Holmdel NJ USA NTT Photonics Laboratory Naka Ibaraki Japan School of Electrical & Computer Engineering Purdue University Indianapolis West Lafayette IN USA

Summary form only given. High repetition rate pulse bursts have been demonstrated from a specially designed AWG and a single short pulse source laser. The key requirement is that the free spectral range (FSR) of the device must be tailored so that multiple filter passbands fit within the input laser bandwidth. The unique properties of this device allow generation of identical, wavelength shifted, very high rate pulse trains for hybrid TDM/WDM communications and photonic signal processing. Initial work has been performed on tailoring the output temporal profile to generate a flat-topped pulse train burst. When applied to a high-repetition rate mode-locked source (> 10 GHz), these -devices could lead to continuous very-high repetition rate output trains (>500 GHz).

关键词： Optical pulses Optical pulse generation Optical design Band pass filters Passband Bandwidth Signal generators Hybrid power systems Time division multiplexing Wavelength division multiplexing

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system management framework and tools for Beowulf cluster 4

System management framework and tools for Beowulf cluster

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4th International Conference/Exhibition on High Performance Computing in the Asia-Pacific Region, HPC-Asia 2000

作者： Uthayopas, P. Paisitbenchapol, S. Angskun, T. Maneesilp, J. Computer and Network System Research Laboratory Department of Computer Engineering Faculty of Engineering Kasetsart University Bangkok10900 Thailand

ISBN: (纸本)0769505902

As the system size of Beowulf-Class cluster system scales up, system administration becomes challenging due to the increased complexity of the system. The lack of powerful tools for the administrative tasks even makes the matter worse. This paper presents a proposed framework for system management of large Beowulf cluster that divided the management task into well defined layers of service. A cluster management tool called SCMS (SMILE Cluster Management system) has been developed according to this framework. SCMS provides a rich set of services and tools for large cluster administration. The current implementation of SCMS is discussed referenced to the proposed framework. The software is now freely available on the Internet. © 2000 IEEE.

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Computational requirements for media signal processing

Computational requirements for media signal processing

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Asilomar Conference on Signals, systems & computers

作者： V.G. Oklobdzija Advanced Computer System Engineering Laboratory Electrical and Computer Engineering Department University of California Davis CA USA

ISBN: (纸本)0780365143

Media signal processing is characterized by high computing power and a great deal of parallelism on low precision data, which usually consists of simple integers with 8, 12, or 16 bits of precision. Efficient processing of media signals requires modifications of the traditional data-path found in general purpose processors. In this paper, we address those differences and propose adequate solutions for efficient implementation of datapath that support main classes of media instructions.

关键词： Signal processing Power engineering computing Concurrent computing Digital signal processing Discrete cosine transforms Motion compensation Data engineering Power engineering and energy Real time systems Registers

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system management framework and tools for Beowulf cluster

System management framework and tools for Beowulf cluster

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International Conference on High Performance Computing in the Asia-Pacific Region

作者： P. Uthayopas S. Paisitbenchapol T. Angskun J. Maneesilp Computer and Network System Research Laboratory Department of Computer Engineering Faculty of Engineering Kasetsart University Bangkok Thailand

关键词： Power system management Laboratories computer networks Power engineering and energy Large-scale systems Condition monitoring Java computer network management engineering management Power engineering computing

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Dynamic flip-flop with improved power

Dynamic flip-flop with improved power

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IEEE International Conference on computer Design: VLSI in computers and Processors, (ICCD)

作者： N. Nedovic V.G. Oklobdzija Advanced Computer System Design Laboratory Department of Electrical and Computer Engineering University of California Davis CA USA

An improved design of a dynamic flip-flop is presented. The proposed design overcomes the problem of the glitch at the output and improves power-delay product for about 27%, while preserving logic embedding property. This is accomplished by equalizing the t/sub pLH/ and t/sub pHL/ of the flip-flop and careful design of keeper elements in the circuit. New design introduces insignificant area increase.

关键词： Flip-flops Delay Logic Clocks Energy consumption MOSFETs Latches Topology Power engineering computing Laboratories

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Hybrid latch flip-flop with improved power efficiency

Hybrid latch flip-flop with improved power efficiency

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Symposium on Integrated Circuits and systems Design (SBCCI)

作者： N. Nedovic V.G. Oklobdzija Advanced Computer System Design Laboratory Department of Electrical and Computer Engineering University of California Davis CA USA

An improved design of a hybrid latch flip-flop is presented. The proposed design overcomes the problem of the glitch at the output and reduces the power consumption and delay of the circuit resulting in a total power-delay-product improvement of about 20%. It also exhibits better soft-clock edge properties compared to the original circuit. This is accomplished by careful design of keeper elements and introducing the feedback path to suppress unnecessary transitions in the circuit. The new design introduces an insignificant area increase.

关键词： Flip-flops Latches Energy consumption Delay Feedback circuits Power dissipation Clocks Power engineering computing Laboratories State feedback

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C4ISR architectures: I. Developing a process for C4ISR architecture design

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systems engineering 2000年第4期3卷 225-247页

作者： Levis, Alexander H. Wagenhals, Lee W. System Architectures Laboratory C3I Center MSN 4D2 George Mason University Fairfax VA 22030 United States Department of Electrical Computer and Systems Engineering C3I Center System Architectures Laboratory United States Institute of Electrical and Electronic Engineers (IEEE) Advancement of Science (AAAS) United States Center of Excellence Command Control Communications and Intelligence George Mason University Fairfax VA United States System Architectures Laboratory United States

The C4ISR Architecture Framework document issued by the Department of Defense specifies three views of an information architecture and defines a set of products that describe each view. These architecture views are to serve as the basis for C4ISR system development and acquisition. The Framework does not provide a process for architecture design. In this paper, information architectures are described in the context of Structured Analysis, and then the architecture views of the Framework and the related products are interpreted in that context. A methodology for architecture design is developed that is then implemented using Structured Analysis and object orientation in two companion papers. © 2000 John Wiley & Sons, Inc.

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Implementation of VRSE over multimedia framework

Implementation of VRSE over multimedia framework

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IEEE Region 10 International Conference TENCON

作者： Jeong-Woo Lee Hee-Choon Kwon Dae-Joon Hwang Multimedia System Laboratory School of Electirical and Computer Engineering Sungkyunkwan University Suwon South Korea

Technology advances and application development in the area of multimedia information systems have been rapidly increasing in recent years. An important issue to be considered in the design of a multimedia information system is the content-based retrieval of multimedia data, which helps users to retrieve the desired information based on the contents of multimedia data. In such systems, multimedia data are analyzed so that the descriptions of their content, i.e., metadata, can be extracted and stored in the multimedia database together with the original raw data. The multi-mode indexing scheme combines and extends the HG-tree, the signature file, and the hashing technique to support a wide range of user queries in a multimedia information system. We describe a new Visual Retrieval system Engine (VRSE) that goes with a visual database running with multimedia collaborative framework.

关键词： Multimedia databases Multimedia systems Information systems Information retrieval Content based retrieval Data analysis Data mining Indexing Engines Visual databases

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