22 research outputs found

    Factory environment networking :

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    Local computer networks :a study

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    This thesis examines the principles underlying the design of local computer networks. It then reviews the features of several existing long-haul and local networks. The design and construction of Bassernet - a network using an Ethernet type protocol on a loop topology is described. Measurements of the performance of Bassernet are presented and commented on. Finally, some speculations are made on the future of the Bassernet network

    DECENTRALIZED CONTROL OF DISTRIBUTED PROCESSING SYSTEMS

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    This thesis presents a methodology for implementing decentralized scheduling for distributed systems. The environment in which the controlling entities make decisions is stochastic and can be described as uncertain since each entity may have a different view of the system state. As a consequence, these entities may make inconsistent decisions. The methodology is based on defining the system state as a set of distributions and using a queueing model to predict the future behaviour of the system. The predicted state is used to schedule the individual job tasks based on minimum predicted job response time. A hypothetical real system is simulated. The methodology was tested using different queueing models and under different environments. An evaluation of the proposed technique using the simulation results indicates a consistent performance improvement over the no network case. Suggestions for extending this research are also presented

    Performance of buffer insertion LANs

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    This thesis presents an evaluation of the performance of some ring local area network protocols, specifically the buffer insertion ring and the token ring. Both dual and single versions of each are considered, and performance statistics are obtained by measurements on real networks, by mathematical analysis, and by computer simulation. New packet routing protocols for dual contrarotating buffer insertion and token ring networks are described and their performance is examined. It is found that, due to the bandwith reuse properties of the routing methods, maximum throughputs of 800% and 200% are achievable, for the dual buffer insertion ring and the dual token ring respectively

    The integrity of serial data highway systems

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    The Admiralty Surface Weapons Establishment (ASWE) have developed a Local Area Network System. This thesis describes the development of a replacement for this LAN system, based around 16 bit microprocessor hosts, as opposed to the minicomputers currently used. This change gave a substantial reduction in size, and allowed the new system to be installed on a ship and tested under operational conditions. Analysis of the data collected during the tests gave performance information on the ASWE system. The performance of this LAN is compared to that of other leading types of LAN. The design of a portable network controller/ monitor unit is presented, which may be manufactured as a standard controller for the ASWE Serial Highway

    Pipeline rings and integrated services rings.

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    Wong, Po-Choi.Summary in Chinese.Thesis (Ph.D.)--Chinese University of Hong Kong, 1989.Bibliography: leaves 156-164

    Computer structures for distributed systems

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