EBK OM
6th Edition
ISBN: 9781305888210
Author: Collier
Publisher: YUZU
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Chapter 14, Problem 8PA
Summary Introduction
Interpretation: the average flow time after every job is completed, tardiness, and lateness individually for SPT sequence, EDD sequence and for the sequence of 2-1-5-3-4 is to be calculated based on the given information.
Concept Introduction: The process of planning the ordering of the activities involves based on the elements such as, priority, set up time and such other is referred to as sequencing.
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Students have asked these similar questions
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
The following jobs are waiting to be processed at Jeremy LaMontagne's machine center. Today is day 250. Using the critical ratio scheduling rule, in what sequence would the jobs be processed?
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- The following jobs are waiting to be processed atJeremy LaMontagne’s machine center. Today is day 250. Using the critical ratio scheduling rule, in what sequencewould the jobs be processed?arrow_forwardWhat are the benefits and drawbacks of the shortest processing time rule (SPT)?arrow_forwardThe 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…arrow_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_forwardThe following jobs are waiting to be processed at Rick Solano’s machine center. Solano’s machine center has a relatively long backlog and sets a fresh schedule every 2 weeks, which does not disturb earlier schedules. Below are the jobs received during the previous 2 weeks. They are ready to be scheduled today, which is day 241 (day 241 is a workday). Job names refer to names of clients and contract numbers. Job Date job received Productiondays needed Date job due BR-02 228 15 300 CX-01 225 25 270 DE-06 230 35 320 RG-05 235 40 360 SY-11 231 30 310 a. Complete the following table. (Show your supporting calculations.) b.Which dispatching rule has the best score for flow time? c. Which dispatching rule would you select? Support your decision.arrow_forwardUsing the SPT (shortest processing time) decision rule for sequencing the jobs, the order is (to resolve a tie, use the order in which the jobs were received): Sequence 1 Job The following jobs are waiting to be processed at Rick Solano's machine center. Solano's machine center has a relatively long backlog and sets a fresh schedule every 2 weeks, which does not disturb earlier schedules. Below are the jobs to be scheduled today, which is day 241 (day 241 is a work day). Job names refer to names of clients and contract numbers. Compute all times based on initiating work on day 241. 2 3 4 5 ... The total flow time for the sequence developed using the SPT rule = days (round your response to two decimal places). The percentage utilization for the sequence developed using the SPT rule = ☐ % (enter your response as a percentage rounded to two decimal places). The average number of jobs in the system for the sequence developed using the SPT rule = jobs (round your response to two decimal…arrow_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_forwardThe following jobs are waiting to be processed at a small machine center: DUE DATE 250 242 250 260 265 JOB 10 20 30 40 50 DURATION (DAYS) 20 10 16 34 6 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 LPT. According to the LPT rulle, 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 jobs (round your response to one decimal place). days (round your response to one decimal place). days (round your response to ane decimal place).arrow_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
- The following five overhaul jobs a re waiting to be processed at Avianic's Engine Repair Inc. These jobs were logged as they arrived. All dates are specified as planning calendar days.Assume that all jobs arrived on day 180; today's date is 200 Using the critical ratio scheduling rule, in what sequence would the jobs be processed?arrow_forwardThe following jobs are waiting to be processed at thesame machine center. Jobs are logged as they arrive:JOB DUE DATE DURATION (DAYS)A 313 8B 312 16C 325 40D 314 5E 314 3 In what sequence would the jobs be ranked according to the follow-ing decision rules: (a) FCFS, (b) EDD, (c) SPT, and (d) LPT? All dates are specified as manufacturing planning calendar days. Assumethat all jobs arrive on day 275. Which decision is best and why?arrow_forwardDe Law Construction has a gotten some construction jobs to build some starter housing units in a few areas. The building time for each housing unit to be completed as well as the date that each unit is to be completed is shown in the table below. Today is Day 471. Which of the sequences, EDD OR SPT should the company use to sequence the order in which they do the jobs, assuming that because of resource constraints it cannot do the jobs simultaneously? HOUSING UNIT Building Time (days) Due Date Marabella 39 Day 502 Tabaquite 23 Day 528 San Juan 30 Day 515 Mayaro 33 Day 498 D’Abadie 41 Day 535 Preysal 40 Day 510 Some time after starting the jobs according to the sequence you decided on, it was found that because of inclement weather the last three housing units in the sequence have been delayed. You now have to prioritise and decide in which order to expedite those three jobs, using the Critical Ratio model. It is now…arrow_forward
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