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Conference on Lasers and Electro-Optics (CLEO)

作者： Wenhua Lin Chau-Han D. Lee Y.J. Chen D.R. Stone Department of Computer Science and Electrical Engineering and Joint Program for Advanced Electronic Materials University of Maryland

Wavelength division multiplexing (WDM) is emerging as one of the dominant technologies for future optical networks.

ISBN: (纸本)0780341252

Wavelength division multiplexing (WDM) is emerging as one of the dominant technologies for future optical networks.

关键词： Wavelength division multiplexing Optical crosstalk Arrayed waveguide gratings Optical waveguides Optical fiber networks Testing Optical switches Phased arrays Optical arrays Temperature

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Comparisons of fast 2D-DCT algorithms for parallel programmable digital signal processors

Comparisons of fast 2D-DCT algorithms for parallel programma...

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

作者： Hyuk-Jae Lee Jae-Beom Lee H. Byun Computer Science Program Louisiana Tech University Ruston LA USA Department of Electrical Engineering Columbia University New York NY USA Department of Computer Science Yonsei University Seoul South Korea

Recent advances in technology make it possible to integrate multiple processors into a single chip to build high performance parallel programmable digital signal processors (PPDSPs). These processors are expected to replace many dedicated digital signal processors to implement important image/signal processing algorithms such as discrete cosine transform (DCT). The paper addresses the issue of how to compare fast 2D-DCT algorithms when they are implemented on a PPDSP. Previously, the efficiency of these algorithms is compared based on the number of operations. This comparison is reasonable when these algorithms are implemented on a dedicated DSP. However, this comparison may not be suitable for general-purpose PPDSPs. The paper proposes to use three parameters, the number of data accesses, the number of communications, and the distance of communications, as new criterion for performance comparison of DCT algorithms. An algorithm-level technique is developed to estimate these parameters for DCT algorithms. The comparison results based on the parameters show that the algorithm proposed by Cho and Lee (1991) might be the best choice for a PPDSP unless it requires large overhead for communication between remote processors. In this case, the conventional row-column method with a fast 1D-DCT algorithm might be the most efficient.

关键词： Signal processing algorithms Digital signal processors Digital signal processing chips Discrete cosine transforms Digital signal processing computer science Costs Image coding Parameter estimation Concurrent computing

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Analysis of product codes for frequency-hopped spread-spectrum with partial band interference

Analysis of product codes for frequency-hopped spread-spectr...

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MILCOM, Military Communications Conference

作者： T.C. Nolan W.E. Stark Department of Defense graduate fellowship program Focused Research Initiative agreement Ann Arbor MI USA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

A jamming game is considered. A transmitter encodes the data, in a product code (PC), and transmits it in a slow frequency-hopped spread-spectrum (FHSS) system. A hostile jammer attempts to block correct packet reception by adjusting the fraction of the total band in which it distributes the jam power, /spl rho/. Two cases are considered. In the first case, the transmitter declares his strategy and the jammer uses this information to select his best jamming fraction. In the second case, the jammer declares his strategy first and the transmitter uses this information to select his best rates. Results are obtained using asymptotic analysis of a product code using singly extended Reed-Solomon (RS) row and column codes whose size grows large. This asymptotic analysis leads to good choices of the row and column rates for the PC in both cases.

关键词： Product codes Spread spectrum communication Interference Jamming Decoding Error correction codes Frequency shift keying Error correction Reed-Solomon codes Transmitters

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Incorporating contextual information in white blood cell identification 97

Incorporating contextual information in white blood cell ide...

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Proceedings of the 11th International Conference on Neural Information Processing Systems

作者： Xubo Song Yaser Abu-Mostafa Joseph Sill Department of Electrical Engineering California Institute of Technology Pasadena CA Dept. of Electrical Engineering and Dept. of Computer Science California Institute of Technology Pasadena CA Computation and Neural Systems Program California Institute of Technology Pasadena CA

In this paper we propose a technique to incorporate contextual information into object classification. In the real world there are cases where the identity of an object is ambiguous due to the noise in the measurements based on which the classification should be made. It is helpful to reduce the ambiguity by utilizing extra information referred to as context, which in our case is the identities of the accompanying objects. This technique is applied to white blood cell classification. Comparisons are made against "no context" approach, which demonstrates the superior classification performance achieved by using context. In our particular application, it significantly reduces false alarm rate and thus greatly reduces the cost due to expensive clinical tests.

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Unification of azo-polymer systems by photo-Induced molecular movement

Unification of azo-polymer systems by photo-Induced molecula...

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Sol-Gel and Polymer Photonic Devices: A Critical Review 1997

作者： Sekkat, Zouheir Knoesen, Andre Knoll, Wolfgang Miller, Robert D. Department of Electrical and Computer Engineering University of California DavisCA95616 United States Max -Planck -Institut Für Polymerforschung Ackermannweg 10 Mainz55128 Germany Frontier Research Program Wako Saitama351-01 Japan IBM Research Center Science and Technology 650 Harry Road San JoseCA95120-6099 United States

We review our recent research in the field of photochromic polymeric structures for optical data storage and nonlinear optics. We unify some of the sub -Themes of azopolymer structures in the light of photo -induced movement of azobenzene molecules. In particular, we discuss photo- induced effects in supramolecular assemblies containing azobenzene molecules (e.g. Langmuir- Blodgett -Kuhn structures and ultrathin silane layers). Reorientation of azobenzenes in these structures will be compared to that observed in spin -cast films. Photoisomerization and photo- induced orientation of azobenzene molecules is also studied at the molecular level by means of azosilane molecules chemisorbed on Silicon Oxide substrates. We establish a correlation between polymer architecture and sub -glass transition temperature (Tg) light- induced molecular movement in high Tg nonlinear optical azo- polyimide polymers. We show that the isomerization reaction itself depends on the polymer molecular structure, and we present evidence of light- induced molecular movement 325 °C below Tg of a rigid NLO azopolyimide polymer containing no flexible connector or tether. © (1997) 2017 SPIE.

关键词： Self assembled monolayers

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A parallel approach to digital holographic reconstruction with twin-image removal

A parallel approach to digital holographic reconstruction wi...

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IEEE Southeastcon

作者： Chihyung Tu J. Gerlach Sung-Chi Chu Ting-Chung Poon Computational Sciences Program Radford University Radford VA USA Department of Mathematics Radford University Radford VA USA Department of Computer Science Radford University Radford VA USA Bradley Department of Electrical Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

A parallel method developed for reconstructing images from holograms obtained with optical scanning holography is presented. A standard portable message-passing library, MPI or message-passing interface, is used to provide the environment of parallel programming. The parallel method is implemented using a network of workstations. The process of reconstructing images with twin-image removal from holograms is performed in parallel with respect to different reconstruction planes of interest. This process contributes to possible faster three-dimensional object identification to be investigated in future research.

关键词： Holography Image reconstruction Holographic optical components Optical recording Convolution Optical filters Concurrent computing Parallel processing Master-slave Mathematics

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Correction to "A Bioelectric Inverse Imaging Technique Based On Surface Laplacians"

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IEEE Transactions on Biomedical engineering 1997年第11期44卷 1163-1163页

作者： Bin He Dongsheng Wu Department of Electrical Engineering and Computer Scince and Bioengineering Program University of Illinois Chicago Chicago IL USA Bioengineering Program University of Illinois Chicago Chicago IL USA

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Operational systems, logistics engineering and technology insertion

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 205-220页

作者： Grubb, MJ Skolnick, A Michael J. Grubb:has perfomzed naval engineering at the Crane Division Naval Surface Warfare Center (NSWC) for more than twenty-five years. He currently the program manager for the Sustainable Hardware and Affordable Readiness Practice Program (SHARP). is a Navy-wide logistics research and development prgram aimed at the successful transiton of proved technologies inot the fleet. SHARP focuses on reducing acquisition performance capability reliability maintainability and readiness of these systems. Mr. Grubb has served as a department director for the past eleven years. His most recent assignment was as director of the Tactical Computer Resources and Test Equipment Department. This organization provided acquisition and in-service engineering support of the Navy's tectical embedded computers priphirals displays and mass memory storage devices. The organization also provided a complete range of product engineering and metrology engineerig services for SSP NevSeaSysCom and the Trident Program. Prior to this appointment Mr. Grubb was deptuy director psysical security programs department and site responsible for program management and system integration of ashore integrated security systems. Mr. Grubb holds a B.S. degree in industrial engineering from Iowa State Universtiy an M.S. degree in industrial engineering from Purdue University and has copleted the course work (Dec.'96 for a master's degree in public and environment affairs at Indiana University-Purdue Univeristy Indianapolis. Dr. Alfred Skolnick operates System Science Consultants (SSC) specilizing in strategic planning technical program definiton technology assessment and engineering analyses on selected matters of national interest. He has taught physics mathematics and management sciences at University of Virginia and Marymount University and is currently adjunct professor of mathematics at Northern Virginia Community College. Form 1985 to 1989 he was president of the American Society of Noval Engineers. Dr. Skolnick served at Applied Physic

In an era of fiscal austerity, downsizing and unforgiving pressure upon human and economic capital, it is an Augean task to identify resources for fresh and creative work. The realities of the day and the practical demands of more immediate fleet needs can often dictate higher priorities. Yet, the Navy must avoid eating its seed corn. Exercising both technical insight and management foresight, the fleet, the R&D community, the Office of the Chief of Naval Operations (OpNav) and the product engineering expertise of the Naval Surface Warfare Center (NSWC) are joined and underway with integrated efforts to marry new, fully demonstrated technologies and operational urgencies. Defense funding today cannot sponsor all work that can be mission-justified over the long term because budgets are insufficient to support product maturation within the classical development cycle. However, by rigorous technical filtering and astute engineering of both marketplace capabilities and currently available components, it is possible in a few select cases to compress and, in effect, integrate advanced development (6.3), engineering development (6.4), weapon procurement (WPN), ship construction (SCN), operation and maintenance (O&M,N) budgetary categories when fleet criticalities and technology opportunities can happily meet. In short, 6.3 funds can be applied directly to ''ripe gateways'' so modern technology is inserted into existing troubled or aging systems, sidestepping the lengthy, traditional development cycle and accelerating practical payoffs to recurrent fleet problems. To produce such constructive results has required a remarkable convergence of sponsor prescience and engineering workforce excellence. The paper describes, extensively, the philosophy of approach, transition strategy, polling of fleet needs, technology assessment, and management team requirements. The process for culling and selecting specific candidate tasks for SHARP sponsorship (matching operational need with t

关键词： Naval vessels

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Body surface Laplacian mapping from potential recordings in man

Body surface Laplacian mapping from potential recordings in ...

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Southern Biomedical engineering Conference

作者： N. Mehdi X. Yu D. Wu N. Jojic B. Baker P. Gosavi A. Seyd S. Bodak K. Umetani B. He Bioengineering Program University of Illinois Chicago USA Department of Electrical Engineering and Computer Science University of Illinois Chicago USA

Body surface Laplacian maps were studied from a set of unipolar potential data in healthy human subjects. The present results indicate that body surface Laplacian maps can be obtained with high reproducibility in the human subjects studied, and can reveal detailed information regarding the underlying ventricular conduction process.

关键词： Laplace equations Helium Humans Electrodes Electrocardiography Bioelectric phenomena Biomedical engineering Electric potential Board of Directors Reproducibility of results

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Development of a X-window based bioelectric mapping software system

Development of a X-window based bioelectric mapping software...

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Southern Biomedical engineering Conference

作者： X. Yu D. Wu B. He Department of Electrical Engineering and Computer Science University of Illinois Chicago USA Bioengineering Program University of Illinois Chicago USA

The authors have developed a multi-purpose X-window based mapping software system. This software system can be used to analyze and display body surface maps of the Laplacian electrocardiogram, potential electrocardiog... 详细信息

关键词： Bioelectric phenomena Software systems Laplace equations Electric potential Humans Electrocardiography Helium Data analysis Heart Signal processing

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