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检索条件"任意字段=Conference on All-Optical Communication Systems: Architecture, Control and Network Issues"

共 2533 条记录，以下是2201-2210 订阅

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1998 28th European Microwave conference, EuMC 1998

1998 28th European Microwave Conference, EuMC 1998

引用

1998 28th European Microwave conference, EuMC 1998

The proceedings contain 270 papers. The topics discussed include: accurate analysis and modeling of slot coupled patch antennas by the TLM-IE and the FDTD methods;a Ka-band high power monolithic HEMT VCO using a sub-resonator circuit with phase control architecture;novel wide bandwidth GaAs sampling MMIC using microstrip based nonlinear transmission line (NLTL) and NLTL shock wave generator design;a 23 GHz baseband HBT distributed amplifier for optical communication systems;accurate characterization of bent waveguide short circuit in waveguide slot arrays;a network and transport layers for mobile computing over Internet;transistor conversion matrix for noise simulations in monolithic microwave oscillators;AWACS concept for ATM wireless broadband multimedia communications;mobile radio interface for UMTS / IMT-2000 and related investigations in the acts frames project;and HEMT oscillators for millimeter wave systems in coplanar waveguide technology.

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1998 28th European Microwave conference, EuMC 1998

1998 28th European Microwave Conference, EuMC 1998

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1998 28th European Microwave conference, EuMC 1998

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Effective and comprehensive solution to traffic grooming and wavelength assignment in SONET/WDM rings

Effective and comprehensive solution to traffic grooming and...

引用

Proceedings of the 1998 conference on all-optical networking: architecture, control, and Management issues

作者： Zhang, Xijun Qiao, Chunming State Univ of New York at Buffalo Buffalo NY United States

In high-speed SONET/WDM rings, the dominant system cost may be the cost of electronic components, or in other words, the cost of SONET ADMs (S-ADMs). The number of S-ADMs can be dramatically reduced by using wavelength ADMs (WADMs) and grooming traffic (i.e., multiplexing lower rate signals) appropriately. In this paper, we propose optimal or near-optimal algorithms for traffic grooming and wavelength assignment to reduce both the number of wavelengths and the number of S-ADMs. The algorithms proposed are generic in that they can be applied to both unidirectional and bidirectional rings with an arbitrary number of nodes under both uniform and non-uniform traffic with an arbitrary grooming (multiplexing) factor. Lower bounds on the number of wavelengths and S-ADMs required for a given traffic pattern are derived, and used to determine the optimality of the proposed algorithms. Our study shows that these lower bounds can be closely approached in most cases or even achieved in some cases using the proposed algorithms. In addition, even when using the minimum number of wavelengths, the savings in S-ADMs due to traffic grooming (and the use of WADMs) are significant, especially for large networks.

关键词： optical communication

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Evaluation of PACS in a multi-hospital environment

Evaluation of PACS in a multi-hospital environment

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PACS Design and Evaluation conference

作者： Siegel, EL Reiner, BI Protopapas, Z Baltimore VA Med Ctr Baltimore MD 21201 USA

ISBN: (纸本)0819427845

Although a number of authors have described the challenges and benefits of filmless operation using a hospital-wide Picture Archival and communication System (PACS), there have been few descriptions of a multi-hospital wide area PACS. The purpose of this paper is to describe our two and a half year experience with PACS in an integrated multi-facility health care environment, the Veterans Affairs Maryland Health Care System (VAMHCS). On June 17, 1995, the Radiology and Nuclear Medicine services became integrated for four medical centers forming the VA Maryland Health Care System creating a single multifacility imaging department. The facilities consisted of the Baltimore VA (acute and outpatient care, tertiary referral center), Ft. Howard (primarily long term care), Perm Point (primarily psychiatric care), and the Baltimore Rehabilitation and extended care facility (nursing home). The combined number of studies at all four sites is slightly more than 80,000 examinations per year. In addition to residents and fellows, the number of radiologists at Baltimore was approximately seven, with two at Ferry Point, one at Pt. Howard, and no radiologists at the Rehabilitation and Extended Care facility. A single HIS/RIS, which is located physically at the Baltimore VAMC is utilized for all four medical centers. The multi-facility image management and communication system utilizes two separate PAC systems that are physically located at the Baltimore VA Medical Center (BVAMC). The commercial system (GE Medical systems) has been in place in Baltimore for more than 4 1/2 years and is utilized primarily in the acquisition, storage, distribution and display of radiology and nuclear medicine studies. The second PACS is the VISTA Imaging System, which has been developed as a module of the VA's HIS/RIS by and for the Department of Veterans Affairs. all of the radiology images obtained on the commercial PACS are requested by the VISTA Imaging System using DICOM query/retrieve commands an

关键词： PACS hospital information system radiology information system network virtual radiology

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Complementary concept for an image archive and communication system in cardiological department based on CD-medical, on-line archive, and network facilities

Complementary concept for an image archive and communication...

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PACS Design and Evaluation conference

作者： Oswald, H Mueller-Jones, K Builtjes, J Fleck, E Deutsch Herzzentrum Berlin & Charite D-13353 Berlin Germany

ISBN: (纸本)0819427845

The developments in information technologies - computer hardware, networking and storage media - has led to expectations that these advances make it possible to replace 35 mm film completely by digital techniques in the catheter labaratory. Besides the role of an archival medium, cine film is used as the major image review and exchange medium in cardiology. None of the today technologies can fullfill completely the requirements to replace cine film. One of the major drawbacks of cine film is the single access in time and location. For the four catheter labaratories in our institutions we have designed a complementary concept combining the CD-R, also called CD-medical, as a single patient storage and exchange medium, and a digital archive for on-line access and image review of selected frames or short sequences on adequate medical workstations. The image data from various modalities as well as all digital documents regarding to a patient are part of an electronic patient record. The access, the processing and the display of documents is supported by an integrated medical application.

关键词： picture archiving and communications systems DICOM meta patient record

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PHOTON-results from the WDM field trial network over 520 km with up to 10 Gbit/s per channel and optical cross-connecting

PHOTON-results from the WDM field trial network over 520 km ...

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European conference on optical communication (ECOC)

作者： M. Lehdorfer M. Rasztovits-Wiech D. Werner B. Hein W. Mullner Siemens AG Vienna Austria University of Technology Vienna Austria Lucent Technologies Network Systems GmbH Deutsche Telekom AG Post und Telekom Austria

This paper presents the results of the final laboratory experiments on WDM transmission and the implemented architecture of the all-optical cross-connect as well as results of the initial field trial phase of the ACTS... 详细信息

关键词： Wavelength division multiplexing WDM networks optical attenuators optical filters optical distortion Repeaters Scanning probe microscopy Stimulated emission Bidirectional control optical fiber networks

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Project MICAS: A multi-vendor, open system incremental approach to implementing an integrated enterprise-wide PACS - Works-In-Progress

Project MICAS: A multi-vendor, open system incremental appro...

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PACS Design and Evaluation conference

作者： Smith, EM Wright, J Fontaine, MT Robinson, A Univ Rochester Med Ctr Dept Radiol Rochester NY 14642 USA

ISBN: (纸本)0819427845

The Medical Information, communication and Archive System (MICAS) is a multi-vendor incremental approach to PACS. MICAS is a multi-modality integrated image management system that incorporates the radiology information system (RIS) and radiology image database (RID) with future "hooks" to other hospital databases. Even though this approach to PACS is more risky than a single-vendor turn-key approach, it offers significant advantages. The vendors involved in the initial phase of MICAS are IDX Corp., ImageLabs, Inc. and Digital Equipment Corp. (DEC). The network architecture: operates at 100 MBits per sec except between the modalities and the stackable intelligent switch which is used to segment MICAS by modality. Each modality segment contains the acquisition engine for the modality, a temporary archive and one or more diagnostic workstations. all archived studies are available at all workstations, but there is no permanent archive at this time. At present, the RIS vendor is responsible for study acquisition and workflow as well as maintenance of the temporary archive. Management of study acquisition, workflow and the permanent archive will become the responsibility of the archive vendor when the archive is installed in the second quarter of 1998. The modalities currently interfaced to MICAS are MRI, CT and a Howtek film digitizer with Nuclear Medicine and computed radiography (CR) to be added when the permanent archive is installed. There are six dual-monitor diagnostic workstations which use ImageLabs Shared Vision viewer software located in MRI, CT, Nuclear Medicine, musculoskeletal reading areas and two in Radiology's main reading area. One of the major lessons learned to date is that the permanent archive should have been part of the initial MICAS installation and the archive vendor should have been responsible for image acquisition rather than the RIS vendor. Currently an archive Vendor is being selected who will be responsible for the management of the archive

关键词： PACS multi-modality multi-vendor turn-key RIS workstation archive network architecture

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Evaluation of the multimedia Ka-band satellite systems 17th

Evaluation of the multimedia Ka-band satellite systems

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17th AIAA International communications Satellite systems conference and Exhibit, 1998

作者： Rusch, Roger J. Emmert, Charles TelAstra Inc P.O. Box 4620 Palos VerdesCA90274 United States Telcom Applications Group United States

In late 1993 and early 1994, two companies proposed extensive Ka-band "Multimedia" satellite networks. They proposed to deliver global, high data rate, digital communications services directly to individual end users. These systems were designed to provide broadband transmission, including television broadcasting, public high data rate Internet access, and private business "intranets". Some hybrid systems would offer both digital data at Ka-band and TV broadcasting services at Ku-band. all of the multimedia systems are intended to substantially expand the role of space-based communications. They are larger and more capable in every aspect than the current satellite systems. The multimedia systems will provide up to 230,000 - 384 kbps duplex circuits worldwide. The systems are also designed to provide T-l (1.544 Mbps), E-l (2.0 Mbps), and higher data rates. The new satellite technology includes multibeam antennas which expand the bandwidth on every satellite and optical intersatellite links. High speed, onboard processing and switching of signals enable a full mesh architecture and eliminate the need for extensive processing in gateway stations. These proposals set off a frenzy of interest in Ka-band. A total of 14 proposals were submitted to the FCC and numerous systems were proposed in Europe and elsewhere in the world. Some of these systems expect to begin construction in 1998. The authors have completed an in-depth study of the business, financial, and market aspects of these new systems for the European Space Agency, which forms the basis, in large part, for this paper. (Any opinions expressed in this paper, however, are solely those of the authors, and do not imply concurrence by ESA.) This study included an examination of the demand for space based high data rate communications services. These systems raise a number of questions which will bear on the success of the new services. The paper briefly discusses some of these issues: Terrestrial alternatives, GEO a

关键词： Satellite communication systems

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Topology management of transmission networks using auto-recognition by "autonomously controlled network elements"

Topology management of transmission networks using auto-reco...

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IEEE conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： T. Kubo M. Tomizawa NTT Network Service Systems Laboratories Musashino Tokyo Japan

In the future multimedia age, path connections will be changed frequently, so network carriers should manage the networks flexibly. The distributed architecture, wherein a small operations system is included in each network element, appears suitable as the network management architecture given this situation. This paper provides a method that automatically recognizes the physical network topology in the distributed control environment, and evaluates its performance. The method reduces the burdens of network operators because network operation requires only the physical construction of equipment and fiber connections.

关键词： network topology Quality of service Costs control systems optical fiber devices Laboratories Distributed control Capacity planning communication system control Data communication

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optical packet switching without packet alignment

Optical packet switching without packet alignment

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European conference on optical communication (ECOC)

作者： P.B. Hansen S.L. Danielsen K.E. Stubkjaer Center for Broadband Telecommunications Department of Electromagnetic Systems Technical University of Denmark Lyngby Denmark

Operation without packet alignment of an all-optical packet switch is proposed and predicted feasible through a detailed traffic analysis. Packet alignment units are eliminated resulting in a simple switch architectur... 详细信息

关键词： optical packet switching optical switches Wavelength division multiplexing optical buffering optical signal processing optical network units Packet switching Analytical models Delay lines Solid modeling

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