Homework – Assignment Example
1. What are the implications of not allocating material in a shop order after availability checking? It is essential that the Material Resource Planning (MRP) system mirror actual shop conditions; that is both the physical system and the information system have to cope with scrap, incorrect counts, changes in customer needs, incorrect bills of material, engineering design changes, and poor vendor performance. (Juvva, 1998)
Should non-allocation material in a shop order after availability checking occurs, this would indicate that a requirement has been offset into the past period and subsequently added to any requirement in the first or most immediate time bucket. This condition means an order should have been placed in the past. But since it was not, lead times through the various production levels must be compressed to meet the end-item schedule.
Making a bad decision in any of these areas will not only create bottlenecks but will also make the company lose money. A few examples are given below:
If a company purchases insufficient quantities of an item used in manufacturing, or the wrong item, they may be unable to meet contracts to supply products by the agreed date; or eventually produce substandard products.
Beginning production of an order at the wrong time can cause customer deadlines to be missed.
Another implication would reflect damage on Processing all the records in one computer which is called regeneration. This signifies that all part number records are completely reconstructed each time the records are processed. The problem with processing less frequently is that the portrayal of component status and needs expressed in the records becomes increasingly out of date and inaccurate. More frequent processing of the MRP records increases computer costs but results in fewer unpleasant surprises (net-change systems).
2. Provide some examples of static and dynamic scheduling problems
Examples of Dynamic scheduling problems:
Problem change during the solving process, Examples:
unscheduled resource breakdown
new jobs appear during solving phase
shorter/longer processing time than expected
Examples of Static Scheduling problems: a new activity to schedule,
or a machine breakdown; problems in school timetabling
Chase, R., Jacobs, F.R., and Aquilano, N.J., Operations Managemetn for Competitive Advantage: Sychronous Manufacturing and Theory of Constraints. On line Learning Center. Retrieved from http://highered.mcgraw-hill.com/sites/0072983906/student_view0/chapter18/
Marte, M. (2002). Models and Algorithms for School Timetabling- A Constraint-Programming Apporach. (Unpublished doctoral dissertation) Universit ¨atM¨unchen. Retrieved from http://www.google.com.ph/search?client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&channel=s&hl=en&source=hp&q=Models+and+Algorithms+for+School+Timetabling+%E2%80%93+A+Constraint-Programming+Approach+Dissertation&meta=&btnG=Google+Search
Materials Requirement Planning. n.a. (July 26, 2010) In Wikipedia. Retrieved July 30, 2010, from http://en.wikipedia.org/wiki/Material_requirements_planning.
Siar, H., Habibe, S. and H. Nabavi. (2010). Static Task Scheduling in Cooperative Distributed Systems Based on Soft Computing Techniques. Australian Journal of Basic and Applied Sciences 4(6): 1518-1526