SIMULATION: Transactions of The Society for Modeling and Simulation International

Pratt, Charles A.

doi: 10.1177/003754978805000601pmid: N/A

Wildberger, A. Martin

doi: 10.1177/003754978805000602pmid: N/A

Havlik, Ivo; Votruba, Jaroslav

doi: 10.1177/003754978805000603pmid: N/A

We present a simulation language GASP/S, an extension of a well- known FORTRAN-based simulation language GASP IV. GASP IV language has been extended using an integration package for solving models of continuous and combined systems described by a set of stiff ordinary differential equations. The V Runge-Kutta- England integration procedure employed in standard GASP IV is unsuitable for problems of this nature. The integration package STIFFSOLVER-81 used in GASP/S has been developed primarily for use in the field of microbial engineering and chemical kinetics.

Fan, I.S.; Sackett, P.J.

doi: 10.1177/003754978805000604pmid: N/A

A simulation model of an in-line Flexible Manufacturing System has been built using the declarative computer programming lan guage PROLOG. The model is a vehicle for the study of dynamic responses of Flexible Manufacturing System control. Animation of system status and powerful user interaction are essential for this application.A simple but effective structure has been formulated in PROLOG as a core kernel of the simulator. The decision making process is modelled as a set of functional queues. Partitioning of the de cision functions permits modeling of complex peer-to-peer co ordinated decision making in non-trivial control environments. This offers many advantages over traditional manufacturing simu lation systems.The authors describe appropriate strategies for the realization of acceptable computational performance while retaining the powerful benefits of the PROLOG environment. The result is a practical operational system which features an incremental de velopment upgrade path, quick prototyping, fast and clearly understood code changes.

Raczynski, Stanislaw

doi: 10.1177/003754978805000605pmid: N/A

Process hierarchy and inheritance make it possible to add new properties to existing objects of simulation models. Thus, the user can construct complex models using a code developed earlier. This feature is discussed and its implementation in the language PASION is pointed out. Examples are given.

Taha, Hamdy A.; Goforth, R.R.

doi: 10.1177/003754978805000606pmid: N/A

Simulation is used to determine the number of sorting devices needed in an automated postal system facility. The model deals with mail types with great variability in processing characteristics. Interactions between continuously and sequentially processed batches at the sorting stations introduces a bias in conventionally collected statistics. This type of interaction in effect necessitates computation of statistics based on moving averages. Unfortu nately, none of the simulation languages provide this capability as a standard output. Although the logic of the basic simulation is straightforward, the model must be significantly modified to produce unbiased or undistorted statistics. SIMNET and SLAM II are used for independently developed final models.

McLeod, John; McLeod, Suzette

doi: 10.1177/003754978805000607pmid: N/A