Operations Management Scheduling
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1. What is sub-optimization in scheduling?
2. Describe how cost accounting is sometimes antithetical to the Theory of Constraints (TOC).
3. What is the difference between finite and infinite loading?
4. You are responsible for an operation that has 12 distinct jobs. Seven of those jobs must be processed in two operations. All seven jobs must go through D and E in that sequence, i.e., D first and then E. Determine the optimal order in which the jobs should be sequenced through the process using the following times:
Job Process D Time Process E Time
1 9 6
2 8 5
3 7 7
4 6 3
5 1 2
6 2 6
7 4 7
5. A machine shop has two machines, A and B. Four jobs need to be processed through machine A first and B second. Job 1 will take one hour on machine A and three hours on machine B. Job 2 will take three hours on A and two hours on B. Job 3 will take seven on A and three on B. Job 4 will take five hours on A and one hour on B. Using Johnson's rule, in what order should these jobs be done?
6. A work center has five jobs assigned to it. They are labeled, in the order of their arrival in the shop, as jobs A, B, C, D, and E. The work center may work on only one job at a time and must complete any job it starts before starting another job. Job A has a processing time of 6 days and is due to the customer in 9 days. Job B has a processing time of 2 days and is due in 16 days. Job C has a processing time of 4 days and is due in 10 days. Job D has a processing time of 3 days and is due in 7 days. Job E has a processing time of 5 days and is due in 12 days. Using the earliest due date (EDD) priority rule, what will be the average lateness of these orders?
7. What is the role of judgment and evaluation in simulation?
8. Discuss the most common approach to determining the appropriate run length of a simulation.
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Solution Summary
The solution to questions based on different concepts of operations management. Sub-optimization in scheduling is examined. The expert describes how cost accounting is sometimes antithetical to the Theory of Constraints (TOC).
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OPERATIONS MANAGEMENT
1. Sub-optimization is a schedule that works well for one part of the organization but creates problem for other parts of the organization or for customer.
2. Theory of constraints is a production planning and control system reported to improve manufacturing performance surpassing both materials requirement planning and just-in-time systems (Spenser, 1993).
The goal of theory of constraints is maximize profit and throughput. Constraints are anything which can limit the system from attaining its goals. While there can be many constraints to a system, only can be critical or dormant at a given time. By breaking these constraints, organization can overcome limitations in the way of achieving it performance related objectives.
One of the basic requirements for TOC is the assumption of a cost accounting system that is very different from traditional accounting system. For example, while traditional accounting aims to maximize contribution margin, TOC does not consider many of the variable costs truly ...
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