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Date: Wednesday, 31st of  October, 2018

Time: 2:45 PM – 4 : 00 PM

Location: Building 22, Room  125




Dr. Omar AL-Sawafy

Assistant Professor

Systems Engineering Department

King Fahd University of Petroleum and Minerals


Abstract :


This seminar will introduce discrete production systems where items are produced one at a time. Manufacturing of large iron castings and special precast panels are examples of such production systems. If the produced items are always conforming, classical production-inventory models are applicable. We consider the case where, the production process is imperfect resulting in nonconforming items that may be reworked or scrapped. If many items are produced, the number of possible sequences of conforming and nonconforming items is enormously huge even for reasonable production periods.  We will present a very efficient approach to study such systems. A major issue that faces the manufacturer is the time it takes to produce a given number of items, customer order, which we call Promise Time (PT).  In this research, we study two possibilities for the rework process. In the first case, rework may not be perfect and it may be repeated as many times as needed until a conforming item is produced. In the second case, rework results in a conforming item. In addition the third case is considered with perfect rework, in which the produced item could be a conforming item, reworkable item, or a scrapped one. Numerical examples will be provided to illustrate these approaches.



Speaker Bio:


Dr. Omar AL-Sawafy is currently an Assistant Professor in Systems Engineering Department at King Fahd University of Petroleum and Minerals (KFUPM), Saudi Arabia. He received his PhD. and MSc. degrees from KFUPM in the same field of production planning and Inventory Control.  His research interests cover areas of Optimization, Production Planning and Inventory Control, Supply Chain Management, and Quality Control.

All faculty, researchers and graduate students are invited to attend.

Systems Engineering Department, College of Computer Sciences and Engineering
Telephone:+966 (13) 860 2988, Email:, Website:
Copyright © 2014 King Fahd University of Petroleum & Minerals


31 Oct 2018


02:45 PM to 04:00 PM