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SIMSCRIPT II.5 Programming Language

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<strong>SIMSCRIPT</strong> <strong>II.5</strong> <strong>Programming</strong> <strong>Language</strong><br />

There are many other ways to formulate the job shop model. A more realistic approach can be<br />

found in the book, Building Simulation Models with <strong>SIMSCRIPT</strong> <strong>II.5</strong>. In that version, there are any<br />

number of machines clustered in groups. Each group has different machines but within a group,<br />

machines are identical. Instead of having a routing associated with each job that comes into the<br />

shop, there are a number of job prototypes. Each job prototype consists of a sequence of tasks. Each<br />

task comprising the prototype has a specified machine group and mean task completion time. Task<br />

completion times are sampled from exponential distributions using the given mean.<br />

Each job arrives according to a Poisson process, at which time its job prototype is randomly selected<br />

according to a statistical distribution provided as input data. Each job is routed through the sequence<br />

of machine groups needed to do its selected prototype's tasks.<br />

The output report from that simulation is as follows.<br />

246

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