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doi: 10.1177/003754978504500403pmid: N/A
Software engineering has proven useful in reducing the cost of developing large and complex software systems and improving the quality of the resulting product. Since many simulation models are both large and complex, simulation-oriented pro gramming languages should be designed to support software engineering techniques. Some key concepts of software enginer ing are discussed, with particular emphasis on modular design and structured programming. Fundamental language structures to support the use of these techniques are proposed for inclu sion in simulation-oriented programming languages. Several ex amples demonstrating the use of these language structures are presented, with particular attention given to their use in com bined discrete/continuous simulation.
doi: 10.1177/003754978504500404pmid: N/A
An engineering industry job shop that manufactures 19 types of products against orders is described, with the objective of evaluating a new sequencing rule based on the monetary value of the job and its processing time, the highest value time ratio rule. Analysis of this rule has not appeared in literature on job shop scheduling.For purposes of comparison, based on the performances in past studies, the following four sequencing rules are included:(1) Shortest processing time rule (2) Slack per operation rule (3) First-in, first-out rule (4) Due date rule.These rules were evaluated on the following criteria: work-in- process inventory in monetary terms, and delivery performance, and a combination of the two measures.Results of the study show that the highest value time ratio rule results in minimum work-in-process inventory. The shortest pro cessing time rule results in maximum delivery performance; the same rule is superior on combined measure of performance.
doi: 10.1177/003754978504500405pmid: N/A
There is a problem with transporting programs so that they will efficiently execute in a new object environment. A review in dicates that the Transportable Programming Language (TPL) method leads to greater execution-time efficiency. However, a hardware implementation of the emulation method can increase the flexibility of the TPL method.
doi: 10.1177/003754978504500406pmid: N/A
Computer simulations of physical systems often include effects of random disturbances. A method is derived for including those disturbances in continuous system simulation language (CSSL) computations. This note shows that the effects of white (or colored) noise are easily implemented by using a random number generator of proper variance. The numerical example of an exponentially correlated random variable illustrates the simulation technique.
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