839 resultados para Time-sharing computer systems
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Vita.
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"Supported in part by Atomic Energy Commission Contract AT(11-1)-1469."
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On cover: COO-1469-0046.
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"Supported in part by the Atomic Energy Commission under Contract no. US AEC AT(11-1) 1018."
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"February 1, 1966."
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Bibliography: p. 43.
The statistical estimation of throughput and turnaround functions for a university computer system /
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Vita.
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Originally presented as the author's thesis (M.S.), University of Illinois.
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"July 5, 1965"
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"This report reproduces a thesis of the same title submitted to the Alfred P. Sloan School of Management, Massachusetts Institute of Technology, in partial fulfillment of the requirements for the degree of Doctor of Philosophy, June 1969."--p. 2.
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Item 247.
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"Under the auspices of the U.S. Department of Energy by the Los Alamos National Laboratory under contract W-7405-Eng.36"--P. [3] of cover.
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Fieldbus communication networks aim to interconnect sensors, actuators and controllers within process control applications. Therefore, they constitute the foundation upon which real-time distributed computer-controlled systems can be implemented. P-NET is a fieldbus communication standard, which uses a virtual token-passing medium-access-control mechanism. In this paper pre-run-time schedulability conditions for supporting real-time traffic with P-NET networks are established. Essentially, formulae to evaluate the upper bound of the end-to-end communication delay in P-NET messages are provided. Using this upper bound, a feasibility test is then provided to check the timing requirements for accessing remote process variables. This paper also shows how P-NET network segmentation can significantly reduce the end-to-end communication delays for messages with stringent timing requirements.
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In this paper, we analyse the ability of P-NET [1] fieldbus to cope with the timing requirements of a Distributed Computer Control System (DCCS), where messages associated to discrete events should be made available within a maximum bound time. The main objective of this work is to analyse how the network access and queueing delays, imposed by P-NET’s virtual token Medium Access Control (MAC) mechanism, affect the realtime behaviour of the supported DCCS.
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Transportation Department, Washington, D.C.