EBK OM
6th Edition
ISBN: 9781305888210
Author: Collier
Publisher: YUZU
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Chapter 14, Problem 7PA
A
Summary Introduction
Interpretation: The average flow time after every job is completed is to be calculated based on the given information.
Concept Introduction: The prescribing and arranging of jobs and activities involved in the manufacturing process wherever it is required is called as
B
Summary Introduction
Interpretation: The average flow time after every job is completed is to be completed based on the given information, under the SPT rule.
Concept Introduction: The prescribing and arranging of jobs and activities involved in the manufacturing process wherever it is required is called as Scheduling.
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The data for five tax analysis jobs waiting to be processed by Martha at T. R. Accounting Service has been collected in the Microsoft Excel Online file below. Open the spreadsheet and perform the required analysis to answer the questions below.
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…
What are the advantages and disadvantages of the shortest processing time (SPT) rule?
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
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, operations-management and related others by exploring similar questions and additional content below.Similar questions
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- Given the data below, using the SPT heuristic sequencing rule, determine the completion date and tardiness for each job as well as the average completion time and average tardiness for all four jobs. Which of the following statements is true? Job Processing time (days) Due date (in days) A 10 10 B 5 8 C 15 25 D 8 15 a.Jobs B and D will have no tardiness b.The tardiness for Job A is 12 days c.The average tardiness is 19.75 d.The average completion time is 6.5arrow_forwardUsing 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) : hours (enter your response as a whole number). = G 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 3 5 6 Suit 1 2 7 3 Deliver 4 2 ∞ N 8 Assume that orders for suits have been listed in the above table in the order in which they were received.arrow_forwardFive jobs are planned to be scheduled. Each of the jobs must be processed on three machines (A, B, and C) in the same order. The processing times are listed below. Use Johnson's Rule to determine the optimal sequence of jobs. Job B 16 10 11 10 14 20 12 3 10 8 4 1 O a) 3-1-2-4-5 O b) Johnson's Rule is not an Optimal Technique O c) 1-2-3-4-5 O d) 5-4-3-1-2 O e) 5-4-3-2-1 O) 5-4-2-1-3 O e) 5-4-2-3-1 2345arrow_forward
- in a short essay explain the advantages and disadvantages of shortest processing time (SPT) and earliest due date (EDD) sequencing rules. Under what circumstances might you prefer one over the other?arrow_forwardConsider the following process at a pharmacy.Customers drop off their prescriptions either in the drive-through counter or in the front counter of the pharmacy. Customers can request that their prescription be filled immediately. In this case, they have to wait between 15 minutes and one hour depending on the current workload. Most customers are not willing to wait that long, so they opt to nominate a pickup time at a later point during the day. Generally, customers drop their prescriptions in the morning before going to work (or at lunchtime) and they come back to pick up the drugs after work, typically between 5pm and 6pm. When dropping their prescription, a technician asks the customer for the pick-up time and puts the prescription in a box labelled with the hour preceding the pick-up time. For example, if the customer asks to have the prescription be ready at 5pm, the technician will drop it in the box with the label 4pm (there is one box for each hour of the day). Every hour, one…arrow_forwardConsider the following process at a pharmacy. Customers drop off their prescriptions either in the drive-through counter or in the front counter of the pharmacy. Customers can request that their prescription be filled immediately. In this case, they have to wait between 15 minutes and one hour depending on the current workload. Most customers are not willing to wait that long, so they opt to nominate a pickup time at a later point during the day. Generally, customers drop their prescriptions in the morning before going to work (or at lunchtime) and they come back to pick up the drugs after work, typically between 5pm and 6pm. When dropping their prescription, a technician asks the customer for the pick-up time and puts the prescription in a box labelled with the hour preceding the pick-up time. For example, if the customer asks to have the prescription be ready at 5pm, the technician will drop it in the box with the label 4pm (there is one box for each hour of the day). Every hour, one…arrow_forward
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