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International conference on Massively Parallel Processing Using optical Interconnections

作者： R.G. Rozier F.E. Kiamilev A.V. Krishnamoorthy UNC-Charlotte Charlotte NC USA Bell Labs Lucent Technologies Inc. Holmdel NJ USA

We present the design of a parallel high-performance chipset for computing 1-D complex fast Fourier transforms (FFTs). The chipset is composed of two chips-a photonic FFT processing engine (PFFT) and a photonic data storage element (PRAM). Using this chipset, a number of high-speed systems can be created. The chipset is compatible with a number of available interconnect technologies, such as free-space optical interconnection schemes involving the flip-chip integration of submicron CMOS ICs with GaAs chips containing 2-D arrays of multiple quantum well diode optical receivers and transmitters.

关键词： optical arrays Concurrent computing Fast Fourier transforms Flexible printed circuits Engines Phase change random access memory CMOS technology optical interconnections Gallium arsenide Diodes

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Evaluation of solar radiation energy as a first-hand option in the preliminary evaluation of PV pumping systems

Evaluation of solar radiation energy as a first-hand option ...

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conference Record of the Twenty Fifth IEEE Photovoltaic Specialists conference - 1996

作者： N. Argaw Tampere University of Technology Tampere Finland

Daily average global solar radiation data of Addis Ababa, Ethiopia, station from year 1970-1994 was taken in the evaluation. The percentage ratio of the solar radiation energy below 3 kWh/m/sup 2//d based on the number of consecutive days, and the probability density and the cumulative frequency distribution of the solar radiation energy were calculated for each month. The evaluation shows that the cost of PV systems can be reduced by carefully evaluating the consecutive bad solar radiation days and the daily water balance. The consecutive negative water balance values are summed, and the lowest value from the series of values is the worst consecutive bad solar radiation days. This lowest value is exactly the amount of the extra water required to fulfil the water demand, and is equal to the size of the water tank. This is the optimum tank size that makes the PV system operating at full capacity.

关键词： Solar radiation Batteries Costs Rain Probability Frequency Water storage Energy storage Cows optical arrays

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A high resolution marine particle analysis system

A high resolution marine particle analysis system

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OCEANS

作者： T.T. Sutton T.L. Hopkins L.C. Langebrake Department of Marine Science University of South Florida Saint Petersburg FL USA Center for Ocean Technology University of South Florida Saint Petersburg FL USA

Suspended particulate matter is a primary variable with respect to biological and physical processes in the marine environment. The authors have developed an integrated towed instrument platform system to analyze as broad a spectrum of particulate sizes as possible using state-of-the-art technology to address basic oceanographic, environmental and military issues. The High Resolution Sampler (HRS) system uses several technologies to address different size classes of the marine particle spectrum. The 50 /spl mu/ to 2 cm (spherical diameter, SD) size classes are quantified using optical Plankton Counters (OPC, Focal Technologies, Inc.), employed alone or in tandem. The 50 /spl mu/ and greater size classes are also quantified using a non-intrusive laser light sheet/video system as well as a collimated dual light sheet system under development. As an alternative to optical systems, the authors are developing a multiple frequency, miniaturized forward-looking "chirp" sonar for ensonifying a parcel of water directly ahead of the light sheet (see Remsen et al., this volume). All data are collected in situ and transferred to deck for real-time display and storage. Verification systems include a plankton cod-end (50-162 /spl mu/ mesh) carousel (20 positions) net system for collecting particles which have passed through the optical sensors. The integrated optical-electronic sensor package is mounted on a towed vehicle which has been sea tested over several years in the Gulf of Mexico and Weddell Sea.

关键词： optical sensors Marine technology Biomedical optical imaging Marine vegetation Instruments Counting circuits optical collimators Frequency Sonar Displays

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Text segmentation for automatic document processing

Text segmentation for automatic document processing

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International conference on Emerging Technologies and Factory Automation (ETFA)

作者： D.P. Mital Goh Wee Leng School of Electrical & Electronic Engineering Nanyang Technological University Singapore

There is a considerable interest in designing automatic systems that can scan a given paper document and store it on electronic media for easier storage, manipulation and access. Most documents contain graphics and images, in addition to text. Thus, the document image has to be segmented to identify text and image regions, so that appropriate techniques may be applied to those regions. In this paper, we have presented a new technique for image segmentation in which text and image regions, in a given document image, are automatically identified. Technique is based on differential-processing text extraction concept. The proposed technique is capable of analysing complex document image layouts. Document image is processed by using textural feature analysis. Results of the proposed method are presented with test images which demonstrate the robustness of the technique.

关键词： Image segmentation optical character recognition software Graphics storage automation data mining Image analysis Technical drawing Image converters Design engineering Paper technology

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Interactive on-line manufacturing and repair system (io-MARS)

Interactive on-line manufacturing and repair system (io-MARS...

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International Automatic Testing conference, AUTOTESTCON

作者： H.H. Scott Crane Division Naval Surface Warfare Center Crane IN USA

The conceptualization of a new manufacturing and repair system began in 199l. This paper explains how the system of 1991 evolved into the system of 1996. The original system proposed consolidating diverse activities into a single, modern facility, built especially for the repair of electronic modules. Management's role was to coordinate all activities from a central point and repair technicians would be given the tools to communicate with all relevant systems. Only a portion of the similar activities have been consolidated into one building. Management decided that oversight, not control, was a goal that all systems did not need to be fully integrated. The original concept envisioned mainframes for central control. LANs, cable, and fiber optics were the connecting links for workstations and other systems. Technicians would enter data, support systems would supply technical and managerial information and databases would accumulate data and produce information. Support systems would schedule work and deliver items to the work areas, as required, without human intervention. Personnel would be free to devote their time to value added tasks. As the system developed, management realized that people needed stress relief and social contact. People needed to leave their work area for breaks; therefore, they created reasons to leave their work area, such as manually scheduling workload or going to the storage location to query the operator about a specific part and then hand carry that part back to the workbench. Full integration of support systems with io-MARs is coming with Internet and Netscape, a new technology not envisioned in the original plans. End item tracking, automated storage and retrieval recording of repair processes; and some integration to outside systems have been completed. But automated material stocking and ordering, production control, test processing, videogenics, certification of processes and people, and failure analysis are enhancements we are still

关键词： Manufacturing Job shop scheduling Control systems Centralized control optical fiber cables optical fibers Joining processes Workstations Information management databases

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Low temperature MOCVD growth of V/VI materials via a Me3SiNMe2 elimination reaction

Low temperature MOCVD growth of V/VI materials via a Me3SiNM...

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International conference on Thermoelectrics (ICT)

作者： T.J. Groshens R.W. Gedridge R. Scheri T. Cole Naval Air Warfare Center Weapons Division Research and Technology Division China Lake CA USA

The reactive precursors M(NMe/sub 2/)/sub 3/ (M=Sb, Bi) and (Me/sub 1/Si)/sub 2/Te were used to deposit films of M/sub 2/Te/sub 3/ (M=Sb, Bi) on Si(111) cut 4/spl deg/ off-axis, GaAs(100), and Kapton substrates between 25/spl deg/C and 150/spl deg/C in a low pressure MOCVD reactor. The film growth process is a novel N,N-dimethylamino-trimethylsilane (Me/sub 3/SiNMe/sub 2/) elimination reaction and not pyrolysis reactions employed in conventional MOCVD techniques. X-ray diffraction data show the crystalline quality and orientation of the resulting polycrystalline films were dependent on the substrate structure and growth temperature. Amorphous films were deposited below 50/spl deg/C. Films deposited at 75/spl deg/C for Sb/sub 2/Te/sub 3/ and 125/spl deg/C for Bi/sub 2/Te/sub 3/ were highly oriented with the (015) reflection plane parallel to the substrate surface. Films of Sb/sub 2/Te/sub 3/ deposited at 150/spl deg/C were highly oriented with the [00l] reflection planes parallel to the substrate surface. The electrical properties and composition of Bi/sub 2/Te/sub 3/ films deposited at 125/spl deg/C on Kapton were independent of the V/VI precursor ratio used. Variation in the composition of a Sb/sub x/Bi/sub 2-x/Te/sub 3/ ternary film across the susceptor was observed due to differences in the reaction kinetics for formation of Sb/sub 2/Te/sub 3/ and Bi/sub 2/Te/sub 3/. This unique deposition reaction provides an alternative route to prepare group V chalcogenide materials which have potential applications in solar cells, reversible optical storage, and thermoelectrics.

关键词： Temperature MOCVD Tellurium Bismuth optical films Substrates optical reflection Material storage Semiconductor films Inductors

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HOLOGRAPHIC storage - THE QUEST FOR THE IDEAL MATERIAL CONTINUES

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optical MATERIALS 1995年第2-3期4卷 370-375页

作者： SINCERBOX, GT IBM Almaden Research Center San Jose CA 95120 USA

Throughout the 30-year history of holographic storage, an enormous number of material systems have been studied for use as the recording medium. In spite of the years and effort expended, the ideal material has not been identified and interest in holographic storage has waned. Recently, however, advances in both organic and inorganic photorefractive materials has rekindled interest in volume holography, not only for information storage but also as a technology that may be important for optical interconnects, neural networks and optical computing. Interest is further enhanced by continuing development in some of the enabling technologies, such as CCD arrays and spatial light modulators, necessary to make a viable storage product. After a brief introduction to holographic storage, this paper will concentrate on defining the systems requirements that drive material selection and review recent advances in photorefractive materials and techniques that address key issues. Included will be a discussion of multiplexing methods as well as various means to inhibit, or at least manage, destructive writing and reading. The paper will conclude with a discussion of the remaining critical issues as a focus for continued research and development.

关键词： optical data storage

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What's driving hard disk storage cost?

What's driving hard disk storage cost?

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1995 Topical Meeting on optical data storage

作者： COVAULT, M HEWLETT PACKARD CORP DIV DISK MEMORYBOISEID 83714

advances in hard disk magnetic recording technology are accelerating the increase in areal density. With the advent of MR heads and PRML channels, the drive industry is doubling the capacity of high performance driver... 详细信息

ISBN: (纸本)0819418730

关键词： DISK DRIVES COST/MB MR PRML AREAL DENSITY DUAL STRIPE MR GMR

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advances in oscillatory optical scanners.

Advances in oscillatory optical scanners.

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conference on Miniaturized Systems with Micro-Optics and Micromechanics/Laser Diode Optics II/optical Engineering for data storage and Laser Imaging

作者： MARSHALL, GF MONTAGU, J GEN SCANNING INC WATERTOWNMA 02172

ISBN: (纸本)0819417300

Technical developments in the past few decades have led to scanners with greater accuracy and higher frequencies of operation at larger scan angles with wider apertures. The causes of this evolution of galvanometric and resonant scanners, whose attributes make sophisticated applications possible, are given in order to anticipate future requirements and technologies for the next generation of these scanning devices.

关键词： BEAM STEERING, BEAM DEFLECTORS, FLEXURES SCANNERS, OSCILLATORY, GALVANOMETRIC, MOVING IRON, MOVING MAGNET, AND RESONANT DIGITAL SYSTEMS, DISPLAYS

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optical MEMORY MEDIA VIA POLYMER-TCNQ CHARGE-TRANSFER COMPLEX

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SYNTHETIC METALS 1995年第1-3期71卷 2215-2216页

作者： KIM, J CHO, O MIN, K PARK, K Materials & Devices Research Center Samsung Advanced Institute of Technology P.O. Box 111 Suwon Korea

Polymer-TCNQ(tetracyanoquinodimethane) charge transfer complexes were synthesized using organic polycations as electron donor, These materials are soluble in organic solvents and spin coatable. The materials are spin coated on polycarbonate substrate with aluminium reflecting layer, and their optical memory effects ate tested at 830nm. With the recording power of 8mW and recording speed of 1. 2m/s, the maximum CNR(carrier to noise ratio) of 40dB was observed.

关键词： Films signal to noise ratios Organic solvents reflecting layer Soluble Memory effect Spin Films charge transfer complex optical data storage polycations Electron donors

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