SIMULATION: Transactions of The Society for Modeling and Simulation International

McLeod, John; McLeod, Suzette; Schiesser, W.E.

doi: 10.1177/003754977702900310pmid: N/A

Landauer, J. Paul

doi: 10.1177/003754977702900301pmid: N/A

George, Laurence L.

doi: 10.1177/003754977702900302pmid: N/A

Prediction of replacement requirements for components (such as manufacturing equipment or engines) requires analysis of a replacement process. Unfortunately, unless component lives are exponentially distributed, that analysis requires transform methods, approxima tions, or simulation. Only simulation or approxima tion may be used for prediction of replacement re quirements when the replacement process is complicat ed, when it is subdivided into several periods of time, when replacements are not all new, or when several identical components that operate simulta neously are supplied from the same stock of spares.This paper shows that in a simulation the use of complementary antithetic random variates in the generation of component lifetimes reduces the vari ance of the sample mean number of replacements in a multiple-component multiple-period replacement process in which the components may be either new or used. Reducing the variance results in more accurate predictions for fixed simulation runtimes or, alter natively, allows shorter runtimes (and hence lower costs) to achieve specified accuracy.

Ranfft, Roland; Rein, Hans-Martin

doi: 10.1177/003754977702900303pmid: N/A

This article describes a simple but efficient analog computer which has been specially developed for the transient analysis of nonsaturated bipolar transistor circuits. Its advantages, when compared to the usual digital computer simulation, are low costs, simple operation, and short simulation time, allowing a fast man-machine dialog. This simulation method has already been successfully used in the design of several high-speed integrated circuits.

Griffin, Antony

doi: 10.1177/003754977702900304pmid: N/A

Morse, M.J.; Gilbert, B.R.

doi: 10.1177/003754977702900306pmid: N/A

A number of advantages may be gained when a digital replacement for an analogue computer is used in a hybrid computing system. This paper describes the interfacing characteristics of the MBD-24 parallel digital simulator and the language which has been developed to control it from a Data General NOVA 820 minicomputer. The language uses the CALL statement of Data General's extended BASIC and the necessary format of these statements is explained. To illus trate the use of the hybrid system and the language, the simulation and measurement of the transfer func tion of the active filter is described.

Huntsinger, Ralph; Madrigal, Orlando; Shah, Subhash N.

doi: 10.1177/003754977702900307pmid: N/A

Innis, George S.

doi: 10.1177/003754977702900308pmid: N/A

doi: 10.1177/003754977702900309pmid: N/A

Cox, James F.; Ledbetter, William N.; Smith, Jeannette M.

doi: 10.1177/003754977702900305pmid: N/A

This article both discusses and measures the use of sim ulation modeling in decision support systems in major cor porations in the U.S.A. The effective use of quantitative techniques requires that managers develop decision sup port systems which include both adequate data bases and the capability of structuring decision models compatible with their corporations' information systems. Since simu lation is one of the most widely used quantitative tech niques, its use in such decision support systems is exam ined. Specifically, this paper attempts (1) to measure the development and use of simulation at all decision- making levels (operational, tactical, and strategic), (2) to examine the use of simulation within each functional area of business, and (3) to identify specific areas within each of the business functions where simulation is being used.