Download Introduction to Operations Research, Seventh Edition by Gerald J. Lieberman Frederick S. Hillier PDF

By Gerald J. Lieberman Frederick S. Hillier

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4-1. Refer to pp. 18–20 of the article footnoted in Sec. 2 that describes an OR study done for the Rijkswaterstaat of the Netherlands. Describe an important lesson that was gained from model validation in this study. 4-2. Read Selected Reference 5. Summarize the author’s viewpoint about the roles of observation and experimentation in the model validation process. 23 (c) OMEGA is constantly being updated and extended to reflect changes in the operating environment. Briefly describe the various kinds of changes involved.

A system of this type was developed for Texaco1 to help plan and schedule its blending operations at its various refineries. Called OMEGA (Optimization Method for the Estimation of Gasoline Attributes), it is an interactive system based on a nonlinear optimization model that is implemented on both personal computers and larger computers. Input data can be entered either manually or by interfacing with refinery databases. , questions about what would happen if the assumed conditions change). OMEGA is maintained centrally by Texaco’s information technology department, which enables constant updating to reflect new government regulations, other business changes, and changes in refinery operations.

4 ALGORITHMS AND OR COURSEWARE An important part of this book is the presentation of the major algorithms (systematic solution procedures) of OR for solving certain types of problems. Some of these algorithms are amazingly efficient and are routinely used on problems involving hundreds or thousands of variables. You will be introduced to how these algorithms work and what makes them so efficient. You then will use these algorithms to solve a variety of problems on a computer. The CD-ROM called OR Courseware that accompanies the book will be a key tool for doing all this.

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