Operations Management
2nd Edition
ISBN: 9781260484687
Author: CACHON, Gerard
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 18, Problem 16PA
Summary Introduction
To determine: The lateness of Job A.
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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
What are the advantages and disadvantages of the shortest processing time (SPT) rule?
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
Operations 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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- The following jobs are waiting to be processed at a small machine center. JOB 10 20 30 40 50 DUE DATE 260 256 260 265 275 DURATION (DAYS) According to the LPT rule, the sequence of jobs should be 10, 50, 40, 20, 30 b) What is the average completion (flow) time? The average completion (flow) time is 62.8 days (round your response to one decimal place) c) What is the average job lateness? The average job lateness is 11.0 days (round your response to one decimal place). d) What is the average number of jobs in the system? The average number of jobs in the system is jobs (round your response to one decimal place). 28 12 8 18 22 D Points: 2 of 4 All dates are specified as manufacturing planning calendar days. Assume that all jobs arrived on day 200 (yesterday) in the order shown but are not scheduled to begin until day 201 (today). a) Sequence the jobs according to LPTarrow_forwardIn a POAM, an action is a scheduled event that indicates the completion of a task or group of tasks. True Falsearrow_forwardCourtney 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. Due date Duration (hours required) Job (hours hence) A 8 16 2 C 24 10 32 16 E 12 6 In what sequence would the jobs be ranked according to the following decision rules: FCFS, EDD, SPT, LPT? According to the FCFS rule, the sequence of jobs should be According to the EDD rule, the sequence of jobs should be According to the SPT rule, the sequence of jobs should be According to the LPT rule, the sequence of jobs should bearrow_forward
- Apply the four popular sequencing rules to the five jobs shown in the table below. For each sequence determine: The average completion time (sum of total flow time/number of jobs) Utilisation measure (Total job work time/Sum of total flow time) Average number of jobs in system (Sum of total flow time/Total job work time) Average job lateness (Total late days/Number of jobs) Job Due Job Work (Processing) Time Date (Days) (Days) 8 6 18 15 23 Job ABCDE 6 W ∞ NO 6 2 8 3 9arrow_forwardJoe's Twenty-four Seven Laundromat has the following jobs waiting to be processed. The first step of the process includes washing and drying the clothes; the second step is pressing the clothing. Joe wants to minimize the amount of time it takes to do all the jobs. The five jobs waiting to be processed are shown here. Job Wash andDry (hours) Press(hours) A 5 4 B 3 4 C 2 3 D 7 5 E 4 2 Wash and Dry Using FCFS, assume the jobs arrive in the order shown (A, then B, then C, etc.). Show the beginning time for each job and ending time for the whole process adding hours throughout the process. A -0 number of hours B-5 number of hours C-8 number of hours D-10 number of hours E-17 number of hours A B C D E 0 enter a number of hours enter a number of hours enter a number of hours enter a number of hours enter a number of hours enter a number of hours Pressarrow_forwardIn her last semester at SPC, Polly Hedron needs to take Statistics, Composition 2, and Ethics. Because Polly is registering early, she has 17 choices for her section of Statistics, 11 choices for her section of Composition, and 19 choices for her section of Ethics. From how many possible schedules can Polly choose? (You may presume that none of these sections interfere with each other) Your Answer:arrow_forward
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