A tool for local area network modeling and analysis
Article Abstract:
Predicting the performance of local area networks (LAN) is a difficult task. Existing analytical models are often too restrictive to apply to cases of interest. The results from previous studies are often difficult to extrapolate to other cases. Individual simulation models for local area networks have been developed in the past. Still, translating the description of the network under study between these models is not straightforward. A general LAN analysis system (GLAS) has been developed to address the performance issues in a common environment. This system models carrier sense multiple areas with collision detection (CSMA/CD), token ring, token bus, fiber distributed data interface (FDDI), networks using the standards defined by IEEE. Also, the logical link control protocol related to these standards is modeled, as are the priority mechanisms. Arbitrary topology and node traffic is allowed. A menu driven interface provides a convenient mechanism for the description of the LAN under study. New variance reduction techniques are included to increase the efficiency of the simulation model. Simply analytical models are included in GLAS to provide estimates of network performance when appropriate. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1990
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A comparative study of finite difference and multiquadric schemes for the Euler equations
Article Abstract:
We present a true scattered-data , grid free spatial approximation scheme called multiquadrics (MQ) first developed by Hardy. We have modified the original MQ scheme and demonstrated that it is exceptionally accurate for not only surface approximations, but also partially derivative estimates. Unlike familiar polynomial approximations, MQ is excellent for moderate to steep gradient regions, but rather poor in relatively flat regions. For that reason, we advocate a hybrid scheme which uses MQ in moderate to steep regions, but switches to the familiar polynomial methods in relatively flat regions. In this paper, we compare the accuracy and operation counts of finite differences and MQ schemes for the solution of time dependent nonlinear set of hyperbolic partial differential equations. We have demonstrated both from an operations count and accuracy that MQ is superior to the familiar finite difference scheme. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1988
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