Operations Management
17th Edition
ISBN: 9781259142208
Author: CACHON, Gérard, Terwiesch, Christian
Publisher: Mcgraw-hill Education,
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Chapter 18, Problem 10PA
Summary Introduction
To determine: The average flow time of the jobs.
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Assume the jobs displayed in Table 18.22 need to be processed on a single resource andare sequenced with the WSPT rule. What is the average flow rate of the jobs (in jobs perminute)?
What are the advantages and disadvantages of the shortest processing time (SPT) rule?
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
9
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. 1CCh. 18 - Prob. 2CCh. 18 - Prob. 3CCh. 18 - Prob. 4C
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- Joe'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_forwardAn architect has five projects to complete. She estimates that three of the projects willrequire one week to complete and the other two will require three weeks and four weeks.During the time these projects are completed (and assuming no other projects areworked on during this time), what is the architect’s flow rate (projects per week)?arrow_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
- At the campus copy shop, six jobs have arrived in the order shown (A, B, C, D, E, and F) at the beginning of the day 1 (today, which is a work day). All of the jobs are due at various times today. Your job is to evaluate four common sequencing rules. JOB DUE (IN HOURS) DURATION (HOURS REQUIRED) A 8 (this job is due in 8 hours) 1.65 B 5.5 (this job is due in 5.5 hours) 1.20 C 4.5 (this job is due after lunch in 4.5 hours) 0.85 D 6 (this job is due in 6…arrow_forwardA work system has five stages with processing times of 58, 247, 91, 262, and 175 mins/unit. A product must go through these stages in a sequential order. What is the bottleneck processing time in mins/unit? (Only enter a number, do not enter any unitsarrow_forwardPayroll: Risks and Controls Below are some of the processes that are typically executed before, during, and after a payroll cycle: Employees record their hours worked. The supervisor reviews and approves each employee's time records with their signature. An officer from the Human Resources department updates employee files after receiving authorized records of overtime and leaves (vacations, illness, etc.) from the supervisor. Afterward, approved records are sent to the payroll officer in the accounting department. The payroll officer calculates the gross payment, applies deductions, and calculates the net payment. Subsequently, the final payroll is sent for the controller's approval. Payments are issued to employees using their preferred delivery method (check or direct deposit). Entries are generated for the corresponding payroll transactions. Withholdings for payroll taxes, Social Security, and Medicare are respectively remitted to the Department of Treasury and the Internal…arrow_forward
- A work system has five serial stations that have process times of 5, 9, 4, 9, and 8. To complete processing, a unit needs to go through all stations. What is the process cycle time of the system?arrow_forwardThe following six jobs are to be scheduled on a single machine: Job 1 2 3 4 5 6 Processing time (min.) 110 120 220 90 180 80 Suppose the jobs are processed in FCFS numerical order. Compute the makespan, flow time for each job, and overall average flow time. Round your answers to the nearest whole number. Job Flow Time (min) 1 2 3 4 5 6 Makespan: minutes Average flow time: minutes In what order would the jobs be processed using the SPT rule? The SPT sequence is - - - - - . Compute the average flow time after each job is completed. Round your answer to the nearest whole number. Average flow time: minutes Compare this answer with your answer to part a. The minimizes flow time and gets the most work done in the least amount of time.arrow_forwardIf the jobs displayed in Table 18.23 are processed using the earliest-due-date rule, whatis the average flow time?arrow_forward
- 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_forwardThe constraints governing the jobs are as fo1lows: A and B are start jobs; A controls C, D and E; B controls F and J; G depends upon C; H depends on D; E and F control I and L; K follows J; L is also controlled by K; G, H, I and L are the last jobs. Draw the network,arrow_forwardA key part of work center scheduling is job sequencing—deciding in what order jobs are scheduled to start/complete. What is the term for the simple rules used to aid this process using a single piece of data about the jobs?arrow_forward
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