Computation - Operations Research Models and Methods

Computation Section

Computation

Adding a Queue

Queuing Results

Non-Markovian Queues

Non-Markovian User Functions

Job Shop Example

Non-Markovian Networks

Closed Networks

Queue Simulation

	Queuing Add-in
	- Adding a Queue

		To add a Queuing model on the worksheet, place the cursor at a cell where the model is to be described and select Add Queue from the menu. The dialog box below allows entry of the parameters of the model. The interarrival and service distributions are assumed to be Exponential, so no entry is required regarding distributions. Specify the name, arrival rate, service rate and number of channels. If the queue is finite, check the appropriate box and enter the maximum number in the system (the maximum number in both queue and service). If the arrival population is finite, check the box and enter the number in the population. If the replication entry is greater than 1, the number entered determines the number of Queuing models put on the worksheet. This is useful when comparing queues with different sets of parameters.

	For an infinite calling population, the arrival rate does not depend on the number in the system, so the arrival rate is the arrival rate to the system. For a finite calling population, the arrival rate is for each individual. The check boxes on the dialog determine optional presentation of the steady state results. Checking the "show titles" box causes titles to be added to the worksheet. When defining a series of Queuing models in sequential cells, it is useful to show the titles for the first model, and then skip the titles for the remaining models. On clicking OK, the add-in places the following display on the worksheet. The data for the queuing system is the first 6 rows and the computed results are in the following yellow cells. These results are computed with functions provided by the add-in.

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Operations Research Models and Methods
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by Paul A. Jensen
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