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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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?
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?
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…
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- What are the advantages and disadvantages of the shortest processing time (SPT) rule?arrow_forwardThe 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?arrow_forwardThe following jobs are waiting to be processed at the same machine center. Jobs are logged as they arrive: In what sequence would the jobs be ranked according to the following decision rules: (a) FCFS, (b) EDD, (c) SPT, and (d) LPT? Alldates are specified as manufacturing planning ca.lendar days. Assumethat all jobs arrive on day 275. Which decision is best and why?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_forwardSequence the following jobs by (a) SPT, (b) DDATE, and(c) SLACK. Calculate mean flow time, mean tardiness, andmaximum tardiness. Which sequencing rule would yourecommend? Why?arrow_forwardWhat are the benefits and drawbacks of the shortest processing time rule (SPT)?arrow_forward
- If the jobs displayed in Table 18.23 are processed using the earliest-due-date rule, whatis the maximum tardiness?arrow_forwardwhere the consulting company has five jobs in its backlog. Create a schedule usingthe EDD rule, calculating the average days past due and flow time. In this case, does EDD outperformthe FCFS rule?arrow_forwardThe 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 -0.44arrow_forward
- The Security Life Insurance Company processes all new life insurance policies through three departments: incoming mail (I), underwriting (U), and policy control (P). Theincoming mail department receives applications and customer payments and then routes the files to the underwriting department. After checking on the applicants’qualifications for life insurance, the underwriting department forwards the file to policy control for the issue of the policy. At the present time, the company has five new policy applications waiting to be processed. The time required for processing in each department is shown below. Policy Department/Hours 1 I/3, U/6, P/8 2 I/2, P/10 3 I/1, U/3, P/4 4 I/2, U/8, P/6 5 I/1, P/6a. Prepare a Gantt chart schedule for these policies.arrow_forwardin 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_forwardIf the jobs displayed in Table 18.23 are processed using the earliest-due-date rule, whatis the average flow time?arrow_forward
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