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检索条件"任意字段=Conference on Advances in Optical Data Storage Technology"

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Proceedings of the 1994 IEEE Global Telecommunications conference - GLOBECOM'94. Part 2 (of 3)

Proceedings of the 1994 IEEE Global Telecommunications Confe...

引用

Proceedings of the 1994 IEEE Global Telecommunications conference - CLOBECOM'94. Part 1 (of 3)

The proceedings contains 115 articles. Topics discussed include advances in modulation and coding, architectures for future mobile systems, testbeds and trials of networks and applications, multiple access satellite systems for fixed and mobile users, bandwidth allocation in ATM networks, new and emerging software technology, source coding for audio and video, multimedia applications and systems, ATM congestion control and performance guarantee, advanced communication systems, PCS multiple access and modulation, satellite transmission techniques, performance modeling of ATM networks, modeling and simulation of high-speed digital communication, signal processing and detection for storage 1, optical systems, ATM traffic and bandwidth management, and network operation and management.

关键词： Communication systems

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CONTROL PROCESSING SYSTEM ARCHITECTURE FOR THE optical COMMUNICATION DEMONSTRATOR 6

CONTROL PROCESSING SYSTEM ARCHITECTURE FOR THE OPTICAL COMMU...

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conference on Free-Space Laser Communication Technologies VI

作者： VOISINET, L JET PROP LAB PASADENACA 91109

ISBN: (纸本)0819414166

A processing system was designed and implemented to support beacon acquisition, precision beam pointing, and command/control functions for the optical Communications Demonstrator. The central processor operates as a command controlled embedded system, but by blending real-time and linear design techniques, a single digital signal processor handles all spaceborne functions. Real-time functions include operation of a CCD array detector, calculation of centroids, computation of point-ahead error, and execution of a steering mirror servo loop at 2 kHz update rate. Linear functions include command interpretation, diagnostic control of all functions, storage and interpolation of data for acquisition and point-ahead calculation, downlinking of status information, hardware control, transmit laser control, and image capture.

关键词： Control systems Signal processing Digital signal processing Space operations Telecommunications optical communications Charge-coupled devices Mirrors Beam controllers Computer simulations

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HIGH-SPEED, HIGH-PERFORMANCE 1M PIXEL IMAGER FOR MACHINE VISION APPLICATIONS 4

HIGH-SPEED, HIGH-PERFORMANCE 1M PIXEL IMAGER FOR MACHINE VIS...

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conference on Charge-Coupled Devices and Solid State optical Sensors IV

作者： SCHAEFFER, CJ STOLDT, H DILLEN, BGM PEEK, HL HOEKSTRA, W PHILIPS IMAGING TECHNOL EINDHOVEN WAG 115656 AA EINDHOVENNETHERLANDS

ISBN: (纸本)0819414670

Philips Imaging technology has succeeded in fabricating an image sensor especially suited for digital image processing. The FT12 sensor is of the frame transfer type and designed for 2/3' optical format. It has a high resolution (1024 X 1024 in interlaced mode), overexposure handling by means of vertical anti-blooming and square pixels of 7.5 micrometers by 7.5 micrometers . The data rate is 60 fields per second in interlaced mode. Its single output register can run up to 40 MHz. The register can be clocked bi-directionally, which makes it possible to produce a mirrored image. These properties make it perfectly suited for machine vision applications, like pattern recognition and real-time process monitoring. The paper describes the sensor, simulation results, measurements, as well as the implementation of the sensor in a camera module.

关键词： Sensors Clocks Electrons Modulation transfer functions Image sensors Machine vision Image storage Imaging systems Digital image processing Imaging technologies

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CONFORMANCE IN THE CONTEXT OF IMPORT-EXPORT FOR DICOM-3.0 INFORMATION OBJECTS

CONFORMANCE IN THE CONTEXT OF IMPORT-EXPORT FOR DICOM-3.0 IN...

引用

conference on PACS: Design and Evaluation

作者： HEWETT, AJ BARTH, A JENSCH, P CARL VON OSSIETZKY UNIV OLDENBURG FACHBEREICH INFORMATD-26111 OLDENBURGGERMANY

ISBN: (纸本)0819414603

The recent publication of the DICOM 3.0 standard for transferring images and other medical information between computers promises greatly enhanced communication and interoperability for medical applications. As part of a prototype implementation of the DICOM 3.0 standard we have also considered the problem of converting DICOM Information Objects into other standard image formats. This paper concentrates on the issues involved in converting DICOM image formats into IPI (Image Processing and Interchange) formats. The issue of conformance is restricted to consideration of information attributes which can be adequately represented in IPI formats and the tradeoffs involved when using different encoding schemes.

关键词： Computer programming Image processing Chemical elements Standards development data conversion Computing systems Imaging systems Medical imaging data storage Information technology

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Optimizing storage of objects on mass storage systems with robotic devices 4th

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4th International conference on Extending database technology, EDBT 1994

作者： Chen, Ling Tony Rotem, Doron Lawrence Berkeley Laboratory BerkeleyCA94720 United States Department of MIS School of Business San Jose State University United States

ISBN: (纸本)9783540578185

Automated robotic devices that mount and dismount tape cartridges and optical disks are an important component of a mass storage system. Optimizing database performance in such environments poses additional challenges as the response time to a query may involve several costly volume mounts and dismounts in addition to seek distances within a volume. In this paper we analyze some optimization problems concerning placement of data on such devices. We present a dynamic programming algorithm for optimal loading of data on a robotic device to minimize expected query response time. The method is general in the sense that it can be tailored to work for different hardware characteristics such as seek and mounting times. A variant of the method is also presented which achieves optimal response times subject to storage utilization constraints. © 1994, Springer Verlag. All rights reserved.

关键词： Dynamic programming

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ACOUSTIC-EMISSION SENSING IN AN ON-BOARD SMART STRUCTURAL HEALTH MONITORING-SYSTEM FOR MILITARY AIRCRAFT

ACOUSTIC-EMISSION SENSING IN AN ON-BOARD SMART STRUCTURAL HE...

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conference on Smart Sensing, Processing, and Instrumentation

作者： MARANTIDIS, C VANWAY, CB KUDVA, JN NORTHROP CORP HAWTHORNECA 90250

ISBN: (纸本)0819414867

A smart structural health monitoring system (SHMS) requires various sensing technologies to detect and locate flaws, and assess their criticality to the structural integrity of the aircraft. To realize its full potential, a SHMS must be capable of remotely sensing flaw growth and location. Acoustic emission (AE) is one of the few sensing technologies that is capable of direct and remote sensing of flaw growth. Currently, there are two AE sensing techniques used for monitoring, detecting and locating flaw growth in structural components. In one technique, specific AE event parameters are captured by narrowband transducers and are studied to identify their source and location. The other technique studies the whole AE waves captured by wideband transducers and then detects and locates flaw growth based on waveform analysis and the wave propagation characteristics of the structure being monitored. This paper investigates both AE techniques, establishes their limitations, and defines the goals that need to be achieved in AE technology before it can successfully be implemented into a SHMS.

关键词： Sensors Structural health monitoring Remote sensing Sensing systems Transducers Acoustics Composites data processing data storage Acoustic emission

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An extended fiber-optic backplane for multiprocessors

An extended fiber-optic backplane for multiprocessors

引用

Annual Hawaii International conference on System Sciences (HICSS)

作者： A.V. Ramanan H.F. Jordan J.R. Sauer D.J. Blumenthal Department of Electrical and Computer Engineering University of Colorado Boulder Boulder CO USA School of Electrical Engineering Georgia Institute of Technology Atlanta GA USA

This paper describes a parallel by wavelength, packet-switched, extended photonic backplane for multiprocessors. Packet-switching is implemented with minimal optoelectronic conversion at switching nodes, with the payload data maintained in optical format. Since, currently it is not possible to provide efficient asynchronous storage in optics, the deflection routing protocol is used to avoid static buffering at nodes. Space-time switching at nodes is utilized to reduce contention for spatial channels. The ShuffleNet topology yields packet flight times that grow logarithmically with size of the system. With current technology, our approach can support up to 100 bits in parallel at network cycle times of the order of 4ns. The architecture is capable of supporting hundreds to thousands of processors separated by distances up to a few hundred meters.< >

关键词： Backplanes optical packet switching Computer architecture Payloads optical interconnections Bandwidth optical devices optical fibers optical fiber devices Switches

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Cavity build-up and transient fluctuations in optical-fibre-loop memories

Cavity build-up and transient fluctuations in optical-fibre-...

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conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： M. Calzavara CSELT (Centro Studi E Laboratori Telecommunicazioni) Via Reiss Romoli 274 10148 Torino Italy

The use of fibre-loop memories is being experimented for solving routing contention of data cells in photonic high bit rate ATM switching fabrics.1 The simplest fiber-loop memory looks like a ring laser consisting of a semiconductor laser amplifier (SOA), a span of fibre introducing a delay of the order of an ATM cell duration (10–6-sec) and a 50/50 directional coupler (Fig. 1). To compensate for the power tapping at the directional coupler while avoiding the onset of laser oscillations, the SOA is biased above the ring laser threshold only for a limited number of round trips, then the bias current is switched off. The memory is thus driven through the transition from a state ruled by spontaneous emission toward a state above lasing threshold, in which stimulated emission is predominant. Far enough from the beginning of the transition the intensity fluctuations display a maximum.2,3 The transition is completed after a time depending on the final state intensity.2 These features significantly affect the maximum storage time and noise behavior of the memory.

关键词： Fluctuations optical fiber networks Telecommunications optical interconnections optical computing Space technology Routing Wavelength division multiplexing Circuits Clocks

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Synthesis and properties of polyacetylene formed using Ti(OBu)/sub 4/-polyalumoxane catalysts

Synthesis and properties of polyacetylene formed using Ti(OB...

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International conference on Science and technology of Synthetic Metals, ICSM

作者： L.I. Tkachenko V.I. Krinichnyi O.S. Roshchupkina G.I. Kozub G.P. Belov Institute of Chemical Physics Russian Academy of Sciences Russia

Summary form only given. Polyacetylene films were synthesized using homogeneous catalytic systems based on Ti(O-C/sub 4/H/sub 9/)/sub 4/, Al(C/sub 2/H/sub 5/)/sub 3/, poly(isobutylalumoxanes) (MM=470,900) and poly(ethylalumoxane) (MM=560). The physic-chemical characteristics of these films were studied with IR spectrometry, 2-mm ESR, cyclic voltammetry and conductometry. Polyacetylene synthesized using Ti(O-C/sub 4/H/sub 9/)/sub 4/-poly(isobutylalumoxane) (MM=900) catalyst has a higher density, a lower rate of oxidation and ageing as well more stable electric properties after six months of storage in argon at 0/spl deg/C. Thus, it can be concluded from the data obtained that an isobutyl substituent in polyalkylalumoxanees is more preferable that the ethyl one and increase of molecular mass of poly(isobutylatumoxanes) leads, both to the higher mechanical strength and conductivity of polyacetylene films.

关键词： Conductive films optical films optical harmonic generation Electrons Chemicals Physics Infrared spectra Spectroscopy Paramagnetic resonance Oxidation

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Characterization of waveguide and grating formation in As/sub 2/S/sub 3/

Characterization of waveguide and grating formation in As/su...

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IEEE Photonics conference (IPC)

作者： J.P. Guo S. Ramachandran S.G. Bishop D.J. Brady Center fir Optoelectronic Science and Technology Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA

Photodarkening in the chalcogenide glass As/sub 2/S/sub 3/ makes it attractive for applications in integrated optics and data storage. Various optical devices can be fabricated using the laser-induced change of refractive index in this material. Waveguides, directional couplers, and holographic gratings have been fabricated on thin films and bulk samples of As/sub 2/S/sub 3/. This paper reports studies of the dynamics of waveguide and grating formation on the surface of bulk As/sub 2/S/sub 3/. Spatial and temporal characteristics of laser-induced refractive index changes are described. Several different materials effects are shown to contribute to the index modulation.

关键词： Gratings optical waveguides Laser transitions Waveguide lasers Refractive index optical materials Photochromism Glass Integrated optics Memory

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