Document Type

Closed Project

Publication Date

Fall 2001


Timothy Anderson

Course Title

Operations Research

Course Number

EMGT 540/640


Operations research -- Case studies, Production scheduling -- Mathematical models, Mathematical optimization, Semiconductor industry -- Management


The high level scope of the project was to create an analysis I decision model for the prioritization of production units or wafers at individual constraint tool sets or modules in the manufacturing line. This model will be used by the operations managers to help in the prioritization of work for each shift at factory constraint modules. By managing the output of these constraints modules, a more consistent week-to-week output from the factory can be achieved.

The development of the model and the scenario analysis that was conducted, provided a greater understanding of the manufacturing constraint module. Proper management of factors such as the starting input values, changing the number of production tools (Production Capacity), and changing the cycle time (WIP turns) allows the constraint module to maintain nearly the same delta between committed output and actual output. The combination of the iterative shiftly model runs and reducing the time horizon ultimately showed the most promise for providing a useful and relatively accurate model. It was suggested in the next steps discussion with the customer that further investigation of this combination be conducted.


This project is only available to students, staff, and faculty of Portland State University

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