OPERATIONS MANAGEMENT IN THE SUPPLY CHAIN: DECISIONS & CASES (Mcgraw-hill Series Operations and Decision Sciences)
7th Edition
ISBN: 9780077835439
Author: Roger G Schroeder, M. Johnny Rungtusanatham, Susan Meyer Goldstein
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 12, Problem 6P
The Security Life Insurance Company processes all new life insurance policies through three departments: incoming mail (I), underwriting (U), and policy control (P). The incoming mail department receives applications and customer payments and then routes the files to the underwriting department. After checking on the applicants' qualifications for life insurance, the underwriting department forwards the file to policy control for the issue of the policy. At the present time, the company has five new policy applications waiting to be processed. The time required for processing in each department is shown below.
Policy Department/Hours | |
1 | 1/3, U/6, P/8 |
2 | 1/2, P/10 |
3 | 1/1, U/3, P/4 |
4 | 1/2, U/8, P/6 |
5 | 1/1, P/6 |
- a. Prepare a Gantt chart
schedule for these policies.
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Questions
1. Use the shortest-processing-time (SPT) sequencing rules to sequence the jobs. Compute the flow time, tardiness, and lateness for each job, and the average flow time, average tardiness, and average lateness for all jobs. Use minus sign to enter negative lateness values, if any. Round the average values to two decimal places.
Sequence
Job
Processing Time
Due Date
Flow Time
Lateness
Tardiness
1
2
3
4
5
Average
2. Use the earliest-due-date (EDD) sequencing rules to sequence the jobs. Compute the flow time, tardiness, and lateness for each job, and the average flow time, average tardiness, and average lateness for all jobs. Use minus…
The first five columns of the following table contain information about a set of four jobs that just arrived (end of Hour 0 or beginning of Hour 1) at an engine lathe. They are the only ones now waiting to be processed. Several operations, including the one at the engine lathe, remain to be done on each job. Determine the schedule by using (a) the CR rule and (b) the S/RO rule. Compare these schedules to those generated by FCFS, SPT, and EDD.
Job
ProcessingTime at EngineLathe (hours)
TimeRemainingUntil Due Date(days)
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8
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12
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7.8
14.5
10.2
2.46
1.28
1.38
0.78
0.89
1.10
0.46
-0.44
Chapter 12 Solutions
OPERATIONS MANAGEMENT IN THE SUPPLY CHAIN: DECISIONS & CASES (Mcgraw-hill Series Operations and Decision Sciences)
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Ch. 12 - Prob. 11DQCh. 12 - Students must complete two activities to register...Ch. 12 - Prob. 2PCh. 12 - Sequence the jobs shown below by using a Gantt...Ch. 12 - In problem 3, assume there are two machines of...Ch. 12 - In problem 2, assume there are two machines of...Ch. 12 - The Security Life Insurance Company processes all...Ch. 12 - At the University Hospital, five blood samples...Ch. 12 - Prob. 8PCh. 12 - Prob. 9PCh. 12 - Using the Gantt charts developed in the following...Ch. 12 - How would the theory of constraints be used to...
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