ALPHATECH, Inc. - Building Models With ALPHA/Sim

Building Models with ALPHA/Sim®

Here's how easy it is to build a model using ALPHA/Sim®
Once you identify your model application and collect the data you need to characterize it:

Define your token types.
Tokens represent the objects flowing through your system. Use the Token Type Edit Form to enter the object names and create the attributes that will be associated with them. Once saved, token types may be combined to form a new token type.

Draw your model.
Drag and drop icons from the palette to define the logical structure of your model. With ALPHA/Sim's® hierarchical approach, you build your model from the top-down, bottom-up, or both.

The screen on the left shows the top-level of a banking model. Double-clicking on a box opens up a new window displaying the contents of that box. For example, the screen on the right shows the inside of the Loans box. Double-clicking on any of the icons in the Loans box will open its data form.

Add timing, routing, logic, and attribute value assignments.
Use the place and transition forms to assign values to token attributes and to define timing parameters, queue disciplines, and branching rules based on probability, priority or expression evaluation. Below is an example of a transition form.

ALPHA/Sim® provides several standard distributions, over 30 built-in functions, and a full assortment of arithmetic and logical operators. You can also incorporate custom functions using ALPHA/Sim's® interface to external code.

Specify statistics for collection.
Enable statistics collection at any point in the model by selecting a check box in the place or transition form. You can collect statistics on places, transitions, or the values of any token attributes. ALPHA/Sim® supports aggregate, interval and sample statistics. Define runs and replications. Use the clock and replications forms to set the duration, number of replications, and random number seeds.

Debug the model.
ALPHA/Sim® automatically locates, lists, and describes any errors in your model.

Run your model.
Select Run to begin model execution. Monitor statistics by opening the statistics window for any place or transition. ALPHA/Sim® also provides single step execution.

For more information contact: alpha.sim@alphatech.com

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