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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2311-2320 订阅

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An optical Bus Computer Cluster with a deferred cache coherence protocol

An Optical Bus Computer Cluster with a deferred cache cohere...

引用

International conference on Parallel and Distributed systems (ICPADS)

作者： S. Shibayama K. Hamaguchi T. Fukui Y. Sudo T. Shimoyama S. Nakamura Media Technology Laboratory Canon Inc. Japan Canon Kabushiki Kaisha Ota-ku Tokyo JP Media Technol. Lab. Canon Inc. Japan

In this paper, we first propose a class of workstation cluster which utilizes optical wavelength-division multiplexing (WDM) technology to connect nodes (work-stations) of the cluster. The optical Bus Computer Cluster (OBCC) falls in the class of cache coherent non-uniform memory access (CC-NUMA) multiprocessors. The basic topology of the cluster is star-shaped with an optical star-coupler in the center to enable one-hop simultaneous broadcasting of information packets from one node to all other cluster nodes. WDM technology not only multiplies by N times the network bandwidth using a single optical fiber, where N is the degree of wavelength multiplexing, but also provides independent communication paths between pairs of cluster nodes by properly assigning wavelengths to inter-node communication. Then we identify the cache subsystem requirements for the OBCC and propose or deferred cache coherence protocol suitable for the OBCC. The basic coherence maintenance scheme is to lazy-evaluate the cache coherence transactions among cluster nodes, utilizing the weak consistency memory model. By deferring the transactions, it is possible to combine multiple transaction issues into one transaction by accumulating modified status bits in the enhanced cache status fields. Since not only the remote memory access but also coherence transaction are costly operations in CC-NUMA systems, the deferred invocation of coherence transactions is particularly useful in CC-NUMA systems such as OBCC. We then give a performance evaluation by simulation that the coherence protocol effectively reduces coherence transactions, particularly in situations where false sharing of longer cache lines becomes noticeable.

关键词： optical computing Coherence Wavelength division multiplexing Workstations network topology Broadcasting Bandwidth optical fibers WDM networks Protocols

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Distributed communication services in the Masix system

Distributed communication services in the Masix system

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International Phoenix conference on Computers and communications (IPCCC)

作者： F. Mevel J. Simon Laboratoire MASI Université Paris VI Paris France Laboratoire SYSMIC Institut Supérieur d''Electronique de Paris Paris France

Masix is a distributed multi-server operating system based on the Mach microkernel, with multiple personality support. Its main feature is a distributed generic layer (DGL), which offers distributed services to the personalities. The distributed multi-server architecture of Masix grants it a high modularity, but also raises many issues, such as transparency, security and performance, which cannot be solved without adequate communication services. To provide total transparency, we extend the traditional Mach communication model to a workstation network by interposing a generic network server (GNS) between the tasks and the microkernel. We defined a global name service, based on a name resolution protocol, which allows any pair of Mach remote tasks to communicate transparently, using the local Mach IPC semantics. Our name server also provides local and remote authentication mechanisms, based on digital signatures and a secret key algorithm. To prevent eavesdropping, all remote communications are transparently encrypted by the GNS, using a public key algorithm. These security measures can be easily merged into the name service, to yield a secure distributed name resolution protocol. Microkernel based-systems are traditionally criticized for their relatively poor performance. As far as network services are concerned, experiments show that a good performance level can be reached, provided that the distinctive features of microkernels are taken into account.

关键词： Operating systems Kernel Workstations communication system security network servers Protocols Memory management Authentication Digital signatures Cryptography

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Parallel simulation of mesh routing algorithms

Parallel simulation of mesh routing algorithms

引用

International conference on Distributed Computing systems

作者： S. Rahman C.R. Das Strategic Semiconduct or Operations Motorola Inc. Boynton Beach FL USA Department of Computer Science & Engineering Pennsylvania State University University Park PA USA

Performance of a network depends primarily on the network topology, switching mechanism, flow control protocol and the underlying routing algorithm. While many routing algorithms have been proposed recently for direct networks, there is no time efficient technique to evaluate and compare all of them. A conventional routing algorithm simulation of a network on a uniprocessor takes unacceptably large computing time. The simulation can be made very time efficient by parallelizing it and running on a parallel test bed. This research is focussed on designing a parallel routing algorithm simulator for n-dimensional mesh connected networks with wormhole switching and virtual channel flow control. The research addresses partitioning mapping, synchronization issues, and implementation of various routing algorithms for 2-D and 3-D mesh architectures. Experimental results show that the parallel simulator can provide significant speedup compared do a uniprocessor environment.

关键词： Computational modeling Discrete event simulation network topology Computer networks Testing Algorithm design and analysis Clocks Routing protocols Partitioning algorithms communication system control

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Enhanced customer value enabled by synergies between protection and control in high voltage substations

Enhanced customer value enabled by synergies between protect...

引用

Fourth International conference on Power System control and Management (Conf. Publ. No. 421)

作者： V.W. Lohmann H. Kattemolle T.E. Jones ABB Network Partner AG Switzerland ABB Industries BV Netherlands UK

The concept of an integrated communication network supporting substation intelligent electronic devices (IED) for protection, control, and data acquisition applications is illustrated. The network architecture is required to provide access to IED data for users in all utility-owned facilities including the local substation, other substations, control centres and corporate offices. A secondary but growing class of application is the digital monitoring of power system primary equipment, e.g. switchgear, transformers, lines, buses and feeders and the transfer of protection system data between IEDs not only in the substation but also to external systems. The areas which are to be examined for seeking improved business performance are related to asset management support. Asset maintenance, refurbishment and replacement options are to be examined and decision support systems are to be specified. The paper indicates possibilities to solve the key questions which are to be considered for the implementation of the new technologies: What benefits can be gained in replacing secondary systems (protection and control equipment)? Can the primary plant, circuit breakers, transformers etc. be better utilised? Can primary plant maintenance be optimised? Is it possible to extend the lifetime of primary plant?.

关键词： Substations

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CDMA network deployment of 8 kbps and 13 kbps voice services

CDMA network deployment of 8 kbps and 13 kbps voice services

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International conference on Universal Personal communications

作者： J. Ketchum M. Wallace R. Walton TELEcode Inc. Concord MA USA

network deployment of voice services based on IS-95 CDMA using both 8 kbps and 13 kbps service options are explored from the standpoint of capacity and coverage. Specifically, issues regarding the various performance tradeoffs associated with operation at 8 kbps and 13 kbps are examined. Significant differences in the system performance exist between these service options, particularly on the forward link. System processing gain, E/sub b//N/sub t/ link performance, forward link power control, along with voice activity and Erlang variations, all contribute to system performance differences. The impact of these and other deployment-related variables on the delivered end-to-end quality of voice services in a large network are addressed. The functionality of a CDMA radio network computer model, TELE*design, which can be used for RF planning of CDMA-based cellular and PCS systems is also discussed.

关键词： Multiaccess communication System performance Performance gain Power control Radio network Computer networks Power system modeling Radio frequency Cellular networks Personal communication networks

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Performance of multiservice dynamic reservation (MDR) TDMA for multimedia wireless networks

Performance of multiservice dynamic reservation (MDR) TDMA f...

引用

International conference on Universal Personal communications

作者： B. Jafarian A.H. Aghvami Centre for Telecommunications Research London WC2R 2LSEngland King''s College London UK

Personal communication network (PCN) technology has become the most important topic in next-generation telecommunication systems. This technology is going to deliver a set of communication services to a hand-held unit at any location. In order to support all these services, asynchronous transfer mode (ATM) technology has been proposed as the choice for mixed data, voice and video communications over a single network. It has been recognised that multimedia wireless networks have become a natural way of providing wireless extensions for future broadband networks. These networks, based on an ATM transport architecture, are designed to support a mix of broadband ISDN services including constant bit-rate (CBR), variable bit-rate (VBR) and packet data. MDR-TDMA is one of the proposed protocols for the medium access control (MAC) sublayer of such a network. We analyze the performance of this protocol for a multimedia scenario. Simulation results of quality-of-service (QoS) and other parameters are presented for this system.

关键词： Time division multiple access Asynchronous transfer mode Personal communication networks Access protocols Media Access Protocol communications technology Next generation networking Wireless networks Broadband communication B-ISDN

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Adaptive resource allocation for embedded parallel applications

Adaptive resource allocation for embedded parallel applicati...

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International conference on High Performance Computing

作者： R. Jha M. Muhammad S. Yalamanchili K. Schwan D. Ivan-Rosu C. deCastro Honeywell Technology Center Minneapolis MN USA Georgia Institute of Technology Atlanta GA USA

Parallel and distributed computer architectures are increasingly being considered for application in a wide variety of computationally intensive embedded systems. Many such applications impose highly dynamic demands for resources (processors, memory, and communication network), because their computations are data-dependent, or because the applications must constantly interact with a rapidly changing physical environment, or because the applications themselves are adaptive. This paper presents a set of dynamic resource allocation techniques aimed at maintaining high levels of application performance in the presence of varying resource demands. It focuses on a class of applications structured as multiple pipelines of data-parallel stages, as this structure is common to many sensor-based applications. We discuss the issues involved in resource management for such applications, and present preliminary results from our implementations on Intel Paragon. Our approach uses feedback control-a real-time monitoring system is used to detect significant performance shortfalls, and resources are reallocated among the application components in an attempt to improve performance. The main contribution of this work is that it combines real-time monitoring of an application's performance with dynamic resource allocation, and focuses on practical implementations rather than simulation and analysis.

关键词： Resource management Application software Monitoring Computer architecture Concurrent computing Distributed computing Embedded computing Embedded system communication networks Computer networks

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all-optical communication systems: architecture, control, and network issues

All-Optical Communication Systems: Architecture, Control, an...

引用

all-optical communication systems: architecture, control, and network issues 1995

The proceedings contain 33 papers. The topics discussed include: characterization of an all-optical clock recovery figure-eight laser for systems applications;simplified tuned optical receivers for use in lightwave optical subcarrier multiplex systems;improved formulation for optically preamplified PPM receivers incorporating timing jitter effects;photonic switch size limitations imposed by phase noise from semiconductor optical amplifiers;widely tunable source generating subpicosecond pulses at 1550 nm;description of all-optical network test bed and applications;digital pulse interval and width modulation for optical fiber communications;design and realization of a suboptimum presynchronization filtering strategy for optical receivers;controlled switching of solitons in fiber nonlinear directional couplers;and comparison and classification of all-optical CDMA systems for future telecommunication networks.

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all-optical communication systems: architecture, control, and network issues

All-Optical Communication Systems: Architecture, Control, an...

引用

Collision Avoidance and Automated Traffic Management Sensors

ISBN: (纸本)0819419788

The proceedings contains 33 papers. Some of the specific topics discussed are: widely tunable source generating picosecond pulses at 1550 nm;description of all-optical network test bed and applications;asymmetry of free space optical links;compressed HDTV over the optical fiber network using PPM CDMA;Kautz topologies for all-optical self-routing networks;and pulse-time modulation for subcarrier-multiplexed systems.

关键词： optical communication

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Evaluation of a model of blocking probability in all-optical mesh networks without wavelength changers

Evaluation of a model of blocking probability in all-optical...

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conference on all-optical communication systems: architecture, control and network issues

作者： Barry, RA Marquis, D MIT LINCOLN LABLEXINGTONMA 02173

ISBN: (纸本)0819419788

We describe the design and performance of a wide-area all-optical network. An improved model of the benefits of wavelength changers in all-optical mesh networks is presented and comparisons are made to simulations. The model is shown to be accurate for a moderate number of wavelengths and a small blocking probability for a variety of networks.

关键词： all-optical networks wavelength changers network modeling

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