OPERATION MANAGEMENT
2nd Edition
ISBN: 9781260242423
Author: CACHON
Publisher: MCG
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Chapter 18, Problem 17PA
Summary Introduction
To determine: The lateness of Job C.
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Currently a company that designs Web sites has six customers in its backlog. The time since the order arrived, processing time, and promised due dates are given in the following table.
Job
Time Since Order Arrived
(days ago)
Processing Time
(days)
Due Date
(days from now)
A
6
18
48
B
4
22
52
C
1
30
70
D
10
14
28
E
7
12
56
F
5
20
62
Develop a schedule by using the first-come, first-served (FCFS) rule and calculate the average flow time and average days past due for the schedule.
Develop a schedule by using the earliest due date (EDD) rule and calculate the average flow time and average days past due for the schedule.
Comment on the performance of the FCFS and EDD rules relative to average flow time and average days past due.
Five jobs are waiting for processing through two work centers. Their processing time (in minutes) at each work center
is contained in the table below. Each job requires work center Alpha before work center Beta. According to Johnson's
rule, which job should be scheduled first in the sequence?
O A. V
OB. U
O C. R
OD. S
O E. T
Job
R
S
T
Alpha
20
23
50
26
55
Beta
34
35
20
26
75
Courtney is a programmer receiving requests each week to analyze a large data base. Five jobs were on her desk
Monday morning, and she must decide in what order to write the code. Assume that all jobs arrived today (day 1 and
hour 1), in the order shown below. Courtney has assigned the number of hours required to do the coding as noted.
Note that Courtney works an 8-hour day and today is a work day.
JOB
DUE DATE (HOURS
HENCE)
18
36
10
22
14
E
a) Sequence the jobs according to EDD.
According to the EDD rule, the sequence of jobs should be
b) What is the average completion (flow) time?
The average completion (flow) time is
c) What is the average job lateness?
The average job lateness is
d) What is the average number of jobs in the system?
The average number of jobs in the system is
place).
DURATION (HOURS
REQUIRED)
3
19
4
9
5
days (round your response to one decimal place)
days (round your response to one decimal place).
jobs (round your response to one decimal
Chapter 18 Solutions
OPERATION MANAGEMENT
Ch. 18 - Prob. 1CQCh. 18 - Prob. 2CQCh. 18 - Prob. 3CQCh. 18 - Prob. 4CQCh. 18 - Prob. 5CQCh. 18 - Prob. 6CQCh. 18 - With weighted shortest processing time, jobs are...Ch. 18 - Prob. 8CQCh. 18 - Prob. 9CQCh. 18 - Prob. 10CQ
Ch. 18 - Prob. 11CQCh. 18 - Prob. 12CQCh. 18 - Prob. 13CQCh. 18 - Prob. 14CQCh. 18 - Prob. 15CQCh. 18 - Prob. 16CQCh. 18 - Prob. 1PACh. 18 - Prob. 2PACh. 18 - Prob. 3PACh. 18 - Prob. 4PACh. 18 - Prob. 5PACh. 18 - Prob. 6PACh. 18 - Prob. 7PACh. 18 - Prob. 8PACh. 18 - Prob. 9PACh. 18 - Prob. 10PACh. 18 - Prob. 11PACh. 18 - Prob. 12PACh. 18 - Prob. 13PACh. 18 - Prob. 14PACh. 18 - Prob. 15PACh. 18 - Prob. 16PACh. 18 - Prob. 17PACh. 18 - Prob. 18PACh. 18 - Prob. 19PACh. 18 - Prob. 1CCh. 18 - Prob. 2CCh. 18 - Prob. 3CCh. 18 - Prob. 4C
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