Practical Operations Management
2nd Edition
ISBN: 9781939297136
Author: Simpson
Publisher: HERCHER PUBLISHING,INCORPORATED
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Chapter 14, Problem 14P
Summary Introduction
Interpretation: Job’s tardiness of Job A where the Job A is due in 4 weeks and the flow time is 2 weeks.
Concept Introduction:
In the
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Students have asked these similar questions
Wood Log Company has forecasted the demand for wooden log for next month. The company has
listed the processing time, and the due date for each task to produce wood log as follows
t; (days) d, (days)
1
3
7
3
5
7
14
5
25
7
19
10
39
12
18
15
25
10
18
40
The company wants to minimize the average flow time. What will be the sequence and schedule,
makespan, average flow time, average lateness, and how many tardiness if:
a. The company have machine to process the wood
b. The company have 2 machine to process the wood
6
7.
4)
The following table contains information regarding jobs that are to be scheduled through one machine:
Job
Processing Time (Days)
Due date
A
4
20
B
12
30
C
2
15
D
11
16
E
10
18
F
3
5
G
6
9
Qus 1: Find the FCFS Schedule?
Qus 2: Find the SOT Schedule?
Qus 3:Find the DDate Schedule?
Qus 4: What are the mean flow time and average lateness for each of the schedule above?
Qus 5: Which priority rule is appropriate for job scheduling? Justify your answer.
The owner/operator of the local franchise of Handyman, Inc., has four jobs to do today, shown in the order they were received:
Job
processing time
hrs due from now
W
4
4
X
3
5
Y
2
2
Z
1
1
If he uses the earliest due date first priority rule to schedule these jobs, what will be the average job tardiness?
Chapter 14 Solutions
Practical Operations Management
Ch. 14 - Prob. 1DQCh. 14 - Prob. 2DQCh. 14 - Prob. 3DQCh. 14 - Prob. 4DQCh. 14 - Prob. 5DQCh. 14 - Prob. 1PCh. 14 - Prob. 2PCh. 14 - Prob. 3PCh. 14 - Prob. 4PCh. 14 - Prob. 6P
Ch. 14 - Prob. 7PCh. 14 - Prob. 8PCh. 14 - Prob. 9PCh. 14 - Prob. 10PCh. 14 - Prob. 11PCh. 14 - Prob. 12PCh. 14 - Prob. 13PCh. 14 - Prob. 14PCh. 14 - Prob. 15PCh. 14 - Prob. 16PCh. 14 - Prob. 17PCh. 14 - Prob. 18PCh. 14 - Prob. 19PCh. 14 - Prob. 20PCh. 14 - Prob. 21PCh. 14 - Prob. 22PCh. 14 - Prob. 23PCh. 14 - Prob. 24PCh. 14 - Prob. 25PCh. 14 - Prob. 26PCh. 14 - Prob. 27PCh. 14 - Prob. 28PCh. 14 - Prob. 29PCh. 14 - Prob. 30PCh. 14 - Prob. 1.1QCh. 14 - Prob. 1.2QCh. 14 - Prob. 1.3QCh. 14 - Prob. 1.4Q
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- Ron Satterfield's excavation company uses both Gantt scheduling charts and Gantt load charts. Today, which is the end of day 7, Ron is reviewing the Gantt chart depicting these schedules: Day Job #151 was scheduled to begin on day 3 and to take 6 days. It got started on time and is 1 day ahead of schedule. Job #177 was scheduled to begin on day 1 and take 4 days. It is currently on time. Job #179 was scheduled to start on day 7 and take 2 days. It actually got started on day 6 and is progressing according to plan. Job #211 was scheduled to begin on day 5, but missing equipment delayed it until day 6. It is progressing as expected and should take 3 days. Job #215 was scheduled to begin on day 4 and take 5 days. It got started on time but has since fallen behind 2 days. Job 12 3 4 56 789 10 11 -- 151 177 + This exercise contains only part a. 179 a) Add the actual progress to the Gantt schedule shown on the right (on which the planned timings have been already plotted). Using the line…arrow_forwardWhich aspects of Priority Scheduling are comparable to those of Shortest Job First Scheduling?arrow_forwardRon Satterfield's excavation company uses both Ganit scheduling charts and Gantt load charts. Today, which is the end of day 7, Ron is reviewing the Gantt chart depicting these schedules: Job #151 was scheduled to begin on day 3 and to take 5 days. It got started on time and is 1 day ahead of schedule. Job #177 was scheduled to begin on day 1 and take 4 days. It is currently on time. Job #179 was scheduled to start on day 6 and take 2 days. It actually got started on day 5 and is progressing according to plan. Job #211 was scheduled to begin on day 5, but missing equipment delayed it until day 6. It is progressing as expected and should take 3 days. Job #215 was scheduled to begin on day 5 and take 5 days. It got started on time but has since fallen behind 1 day. This exercise contains only part a a) Add the actual progress to the Gantt schedule shown on the right (on which the planned timings have been already plotted as blue lines). Using the line drawing tool, plot the actual…arrow_forward
- Ron Satterfield’s excavation company uses bothGantt scheduling charts and Gantt load charts.a) Today, which is the end of day 7, Ron is reviewing theGantt chart depicting these schedules:◆ Job #151 was scheduled to begin on day 3 and to take6 days. As of now, it is 1 day ahead of schedule.◆ Job #177 was scheduled to begin on day 1 and take4 days. It is currently on time.◆ Job #179 was scheduled to start on day 7 and take2 days. It actually got started on day 6 and is progressing according to plan.◆ Job #211 was scheduled to begin on day 5, but missing equipment delayed it until day 6. It is progressing asexpected and should take 3 days.◆ Job #215 was scheduled to begin on day 4 and take5 days. It got started on time but has since fallen behind2 days.Draw the Gantt scheduling chart for the activities above.b) Ron now wants to use a Gantt load chart to see how muchwork is scheduled in each of his three work teams: Able,Baker, and Charlie. Five jobs constitute the current workload for…arrow_forwardRon Satterfield's excavation company uses both Gantt scheduling charts and Gantt load charts. Today, which is the end of day 7, Ron is reviewing the Gantt chart depicting these schedules: Job #151 was scheduled to begin on day 3 and to take 7 days. It got started on time and is 1 day ahead of schedule. Job #177 was scheduled to begin on day 3 and take 5 days. It is currently on time. Job #179 was scheduled to start on day 6 and take 3 days. It actually got started on day 5 and is progressing according to plan. Job #211 was scheduled to begin on day 5, but missing equipment delayed it until day 6. It is progressing as expected and should take 3 days. Job #215 was scheduled to begin on day 4 and take 5 days. It got started on time but has since fallen behind 2 days. This exercise contains only part a. a) Add the actual progress to the Gantt schedule shown on the right (on which the planned timings have been already plotted as blue lines). Using the line drawing tool, plot the actual…arrow_forwardKamauf Custom Glass, Inc., manufactures custom windows primarily for homes and churches. Small repair jobsmay take a few hours, but larger jobs may take hundreds ofhours. How to schedule the jobs is a continuing issue. The schedulerhas decided to see what insight can be gained by examiningsome common sequencing rules, namely FCFS, EDD, SPT, andLPT, on the criteria of average completion (flow) time, averagelateness, and average number of jobs in the system. Her sampleis the six jobs on the scheduler's desk Monday morning. Assumethat all jobs on the scheduler's desk arrived today (day 100, whichis a workday) in the order shown below. The estimated times tocomplete the jobs and their due dates are noted. a) Sequence the jobs according to the following decision rules:FCFS, EDD, SPT, and LPT.b) For the FCFS sequence, compute the average completion(flow) t ime, average lateness, and average number of…arrow_forward
- Eva, the owner of Eva's Second Time Around Wedding Dresses, currently has five dresses to be altered, shown in the order in which they arrived: Job VWX Y Z Processing Time (hrs) 7 1 9 3 5 Due (hrs from now) 5 1 4 2 3 If Eva uses the shortest processing time first (SPT) priority rule to schedule these jobs, what will be the average completion time?arrow_forwardIf the cycle time is 65.4 seconds and A is assigned as the first task in Workstation #1, what is the idle time after assigning task A? Task Task Time (seconds) Tasks That Must Precede Other Tasks Number of Following Tasks A 28 - 7 B 13 - 8 C 35 B 7 D 11 A 6 E 20 C 6 F 6 D, E 5 G 23 F 3 H 25 F 2 I 37 G 1 J 11 G, H 1 K 27 I, J 0 Total 236 a. 26.9 minutes b. 37.4 seconds c. 28.5 seconds d. 31.6 seconds e. 57.6 secondsarrow_forwardProcessing times and due dates for five jobs are shown in the table below. Assume the jobs are processed using the earliest-due-date rule. Job A B C D E Processing time (weeks) 2 0.7 1 4 1.3 Due time (weeks) 1 8 4 5 2 12. What would be the lateness of job B? What would be the tardiness of job E? 14. What is the maximum tardiness for this set of jobs? Note: Round your answer to 1 decimal place. 15. What is the average flow time for this set of jobs? Note: Round your answer to the nearest whole number.arrow_forward
- Relative to job-based scheduling, how does a finite load differ from an infinite load?arrow_forward← Using the FCFS rule for scheduling, the sequence is 1-2-3 For the schedule developed using the FCFS rule, the total length of time taken to complete the three suits (including delivery)= 225 hours (enter your response as a whole number). Using Johnson's rule for 2-machine scheduling, the sequence is A Sunny Park Tailors has been asked to make three different types of wedding suits for separate customers. The table below highlights the time taken in hours for cutting and sewing (process 1) and delivery (process 2) of each of the suits. Times Taken for Different Activities (hours) Cut and Sew 7 4 5 Suit 1 2 3 Deliver 2 3 6 Assume that orders for suits have been listed in the above table in the order in which they were receivedarrow_forwardGiven the projects displayed in Table 18.21, if SPT is used to sequence the jobs, what isthe average inventory of the projects (in projects)?arrow_forward
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