OPERATIONS MANAGEMENT CUSTOM ACCESS
11th Edition
ISBN: 9780135622438
Author: KRAJEWSKI
Publisher: PEARSON EDUCATION (COLLEGE)
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Chapter 10, Problem 20P
The Mowry Machine Shop still has five jobs to be processed as of 8 A.M. today (day 23) at its bottleneck opera lion. The day when the order arrived, processing time, and promised due dates are given in the following table. The jobs are listed in the order of arrival.
- Develop separate schedules by using the FCFS and EDD rules. Compare the schedules on the basis of average flow time and average days past due.
- Which rule gives the best
schedule , in your judgment? Why?
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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)
Number ofOperationsRemaining
Shop TimeRemaining(days)
CR
S/RO
1
2
3
4
2.3
10.5
6.2
15.6
15
10
20
8
10
2
12
5
6.1
7.8
14.5
10.2
2.46
1.28
1.38
0.78
0.89
1.10
0.46
-0.44
Write the Objectives of Workcenter Scheduling?
Sunny Park Tailors has been asked to make three dif-ferent types of wedding suits for separate customers. The table
below highlights the time taken in hours for (1) cutting and sewingand (2) delivery of each of the suits. Which schedule finishes sooner:first come, first served (123) or a schedule using Johnson’s rule?Times Taken for Different Activities (hours)SUIT CUT AND SEW DELIVER14 227 736 5
Chapter 10 Solutions
OPERATIONS MANAGEMENT CUSTOM ACCESS
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