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

共 2518 条记录，以下是2251-2260 订阅

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Proceedings of the 1997 IEEE Global Telecommunications conference. Part 3 (of 3)

Proceedings of the 1997 IEEE Global Telecommunications Confe...

引用

Proceedings of the 1997 IEEE Global Telecommunications conference. Part 2 (of 3)

This Volume 3 of the conference proceedings contains 125 papers. Topics discussed include satellite communication systems, mitigating wireless channel impairments through diversity processing, synchronization, signal processing and coding for storage systems, advances in wireless ATM and wireless broadband access, wireless architecture and multimedia issues, ATM traffic management, fault management and reliability, traffic modeling, enterprise network management, performance enhancement for wireless CDMA systems, coding and error control, modeling and simulation techniques, issues in building wireless communication infrastructure, wireless: channel assignments and access protocols, ATM traffic management, configurable systems, services, agents and middleware technology: methods and tools, networking systems modeling and virtual path management and routing.

关键词： Telecommunication networks

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Large-scale contents publishing architecture based on reliable multicast

Large-scale contents publishing architecture based on reliab...

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Proceedings of the 1997 15th Annual International conference on Computer Documentation

作者： Shiroshita, Teruji Takahashi, Osamu Shiokawa, Shizuo NTT Information and Communication Systems Lab Yokosuka Japan

communication networks have matured to realize online digital contents publishing. This paper proposes a contents publishing architecture which makes a large-scale contents delivery available using recent networks. Multicast is a promising network technology to provide large-scale efficient delivery. However, the issues of reliable and restricted delivery using multicast need to be solved to realize a practical contents publishing. A reliable multicast tool is proposed for error free and confirmed delivery to thousands of users. A contents publishing procedure including service access control and delivery charge is also proposed for commercial publishing.

关键词： Electronic publishing

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Implementing new technologies for public safety communication: Competing frequency demands and standardization issues

Implementing new technologies for public safety communicatio...

引用

conference on Training, Education, and Liability issues for Law Enforcement Scientists and Engineers

作者： Stevens, KJ Allen County Sheriff Dept. (United States)

ISBN: (纸本)0819423416

Attempting to incorporate new technology into an existing environment is often very difficult. The problems are lengthy to resolve, wrought with confusion and seldom turn out like anyone expected. This document represents an overview of one such attempt. It outlines the general areas of concern which could be affected by a transition, and potential problems that may be encountered as a result of the effort. Over the past several decades, many local, state and federal agencies are pressing for more efficient use of frequency spectrums. The urgency of this issue has grown due to the demands of several groups wanting access to these channels for commercial use. Pager systems, cellular telephones, radio systems for private businesses all demand more space. Public safety agencies are starting to fear their needs will diminish in importance as the available channel spectrums are consumed by commercial ventures. How to share these channels, purchase appropriate equipment to meet your needs, and stay within a reasonable budget are not easy tasks. Public safety agencies who rely on communication networks in the performance of their jobs also know why encryption is important. Protecting the rights of citizens as police exchange information over the air, maintaining the integrity of an investigation and officer safety are all concerns police must address each time they use a radio.

关键词： liability public safety communication technology transition wireless

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Design issues for interconnection networks in massively parallel processing systems under advanced VLSI and packaging constraints

Design issues for interconnection networks in massively para...

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作者： Lacy, William Stephen Georgia Institute of Technology

学位级别：Ph.D.

The design of interconnection networks for massively parallel processing (MPP) systems is inherently responsive to advances in VLSI and packaging technology. Optimizing the cost and performance of interconnection networks under these constraints requires an understanding of how technology trends affect network design tradeoffs at the architectural level. Technology trends expected to exert a major influence on the cost-performance of MPP interconnection networks include "gigascale integration" (GSI) capability at the chip-level ($>$one billion devices per chip), die bonding techniques permitting greater than 1000 I/Os, the use of advanced multichip substrates, and the development of high-performance three-dimensional interconnects using both electrical and optical connections for through-wafer signaling. The research focus of this thesis is to explore how MPP network architecture can be designed to best exploit VLSI and packaging advances. This problem is explored in the context of two primary research contributions. The first major contribution is a new MPP network topology, the offset cube, designed to leverage the three-dimensional packaging advantages of through-wafer optical interconnects without sacrificing the architectural efficiency required in a multicomputer network. High-performance, deadlock-free wormhole routing protocols are developed for the offset cube and evaluated using flit-level network simulation. The second major contribution is an integrated modeling framework for exploring the interaction of architectural features and implementation technology in VLSI communication routers. The framework consists of a hierarchy of models describing router microarchitecture, chip-area requirements, and internal flow-control delays as a function of both architectural and technological parameters. The framework also includes a flit-level network simulator incorporating behavioral models for router architectural features. Using these models, a set of experimenta

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Data management, IN services and interworking in DAWN - A distributed architecture for wireless PCS networks: An overview

Data management, IN services and interworking in DAWN - A di...

引用

1997 IEEE 6th International conference on Universal Personal communications Record (ICUPC 97)

作者： Kalbag, RS Medhi, D Univ of Missouri-Kansas City Kansas City United States

ISBN: (纸本)0780337778

In this paper we present enhancements for a wireless PCS architecture which distributes processing from the mobile switching centers and cell sites. In a wireless environment all the call processing components need access to the subscriber data. The subscriber profile distributing scheme envisioned for this architecture provides a method to localize data in clusters and access it remotely, which leads to reduction in service profile transfers and better load sharing. Our propagation model of service profile transfers also reduces the number of times service profile updating is required. We also introduce a way to incorporate wireless intelligent network services in the call control phase and provide processing of these services in a distributed manner. The interworking needed to allow coexistence with conventional wireless networks is also presented.

关键词： Personal communication systems

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Experiments of Dicom over ATM in LAN and WAN networks

Experiments of Dicom over ATM in LAN and WAN networks

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conference on PACS Design and Evaluation - Engineering and Clinical issues, at the Medical Imaging 1997 Meeting

作者： Venturi, G Uras, C Cabitza, G CRS4 (Italy)

ISBN: (纸本)0819424463

communication data systems play a central role in Medical Imaging. Both PACS internal image networks and teleradiology systems need a very large bandwidth to operate. Until recently, industrial standarized protocols have proved to be inadequate to meet the requirements of image transfer at a speed compatible with patient-care needs. PACS vendors, especially when using a shared memory architecture, have developed and inserted proprietary protocols in their systems, causing the well known drawbacks of not standardized environments. Recent technological advances provide potential solutions to these constraints. ATM, above all, provides the aggregate bandwidth and throughput that may be satisfactory to the medical imaging community. At the moment there are no references of working PACS using ATM but several experiments have been reported. This work reports the experiences acquired using ATM as a backbone for a distributed medical imaging system under development at CRS4. The attention is focussed, in particular, on the performance of DICOM over ATM. It is well known that the transmission subset of DICOM typically uses TCP/IP protocols. A protocol stack is created for running over ATM, where each layer segments and reassembles data according to its rules. This configuration has the great advantage of allowing ATM communication without any change in the DICOM protocol. Moreover it allows the optimization of different networks segment, using different low level protocols, within a single DICOM environment. As a drawback, an overload of protocol data is introduced, lowering the troughput to values for below the nominal ones.

关键词： ATM DICOM TCP/IP communication networks LAN WAN

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Use of commercial products for configuration management of military networks

Use of commercial products for configuration management of m...

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Proceedings of the 1997 MILCOM conference. Part 3 (of 3)

作者： Fonzo, Anthony G. Bradley, Mark K. Garhart, Jack S. U.S. Army Communication-Electronics Command Fort Monmouth United States

There is a need for an automated architecture engineering tool to support advanced communication networking efforts. Agencies, such as the US Army's communications-Electronics Command (CECOM) and Program Executive Office Command, control, and communications systems (PEO-C3S) have the requirement for a suite of applications to provide detailed diagramming, definition and analysis. Many COTS and GOTS products are available to perform some of the tasks required in analyzing, designing, developing, and implementing a network. Many tools which are graphically oriented for use in designing a network, do not provide the capability of automated analysis. While many other network analysis tools are not graphical or user-friendly, they lack the ability to store relevant `user' data. Some of the information to populate the network architectures exists in inventory databases but the data is not easily accessible and does not contain all the information required.

关键词： Military communications

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Design considerations and performance of an adaptive HF systems architecture

Design considerations and performance of an adaptive HF syst...

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7th International conference on HF Radio systems and Techniques

作者： Street, M Darnell, M Hunt, B Honary, B Arthur, P Maundrell, M Univ Leeds Leeds W Yorkshire England

ISBN: (纸本)0852966881

This paper describes an adaptive HF radio systems architecture, from concept through to implementation. The key to adaptivity lies in software, and some of the software issues which affect the design and realisation of an HF 'software radio' will be discussed, Mitola (1), Lackey and Upmal (2). This adaptive system has been developed with the aim of providing a flexible testbed upon which to test new techniques for automated HF radio systems. The requirements of such a testbed placed a number of constraints upon the adaptive system which affected the design and functionality. One of these requirements was that the adaptive system should comply with the US MIL-STD 188-141A standard for Automatic Link Establishment (ALE), US DoD (3). The relative performance of the adaptive system and commercial equipment operating to this standard shows that the flexibility offered by an adaptive system does not impair performance in the MIL-STD 188-141A interoperable mode. The operation of an Automatic Radio control System (ARCS) can be divided into 3 distinct phases, Arthur & Maundrell (4). The radio link is set up using ALE procedures;once the link is in use the changeable nature of the HF channel makes some form of Automatic Link Maintenance (ALM) necessary. In order to select the optimum channel upon which to establish the link Automatic Channel Selection (ACS) requires some mechanism to sense or predict the current channel conditions. all 3 of these phases must be implemented in a system capable of providing a testbed for new techniques for ARCS, and must be implemented with some flexibility in terms of functionality and configuration if the system is to be either a useful testbed or an effective adaptive system.

关键词： Radio communication

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Personal communications services over HFC CATV networks

Personal communications services over HFC CATV networks

引用

Canadian conference on Electrical and Computer Engineering (CCECE)

作者： A.A. Elfeitori V.C.M. Leung Department of Electrical Engineering University of British Columbia Vancouver BC Canada

We propose a cost effective deployment of personal communications services (PCS) over hybrid fibre coaxial (HFC) CATV networks. Our proposal utilizes the emerging IEEE 802.14 network architecture and the medium access control (MAC) protocol. This paper presents the proposed network architecture and addresses some PCS mobility issues such handoff (HO), and location registration and update.

关键词： Personal communication networks Hybrid fiber coaxial cables TV broadcasting Media Access Protocol Helium network topology Costs optical fiber communication Coaxial components Power cables

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A study of train communication systems for future railways using multimeter-wave radio

A study of train communication systems for future railways u...

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International conference on Parallel and Distributed systems (ICPADS)

作者： K. Abe T. Hattori H. Koizumi University of Tohoku Japan Mitsubishi Electric Corporation Limited Japan

This paper presents a concept of multimedia railway information and communication system for train operation and passengers, which is intra-network system for railway information connected to public network. And this paper proposes a new train radio communication system between trains and ground facilities which adopts subcarrier multiplexed (SCM) lightwave system in feeder links and 45 GHz band millimeter wave radio communication system in radio links, for aiming high-speed and large-capacity communication such as multi-channel quasi-videos. Also this paper describes performance estimation of this proposed system obtained by computer simulation. Results of estimation show a high degree of feasibility in all cases.

关键词： Rail transportation Millimeter wave communication Base stations communication system control Transmitting antennas Proposals optical fiber cables optical fiber communication Radio control Radio spectrum management

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