Operations Management
17th Edition
ISBN: 9781259142208
Author: CACHON, Gérard, Terwiesch, Christian
Publisher: Mcgraw-hill Education,
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Chapter 18, Problem 2PA
Summary Introduction
To determine: Average flow rate of the projects in FCFS sequence.
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Courtney 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 be
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 LPT
state whether or not each situation would be considered “compensable time” (and why or why not).
An employee of a fast food chain has to arrive at work 15 minutes early to change into the“mascot” costume and it typically takes another 15 minutes at the end of the shift to change outof the costume and properly store it. Due to the cost of the costume, employees are notallowed to take the costume home. The “mascots” typically work from 10am – 2pm, to coverthe lunch rush periods. How much time would be “compensable” for the mascots, assumingthe conditions/schedule listed above?2) George is a Radiology Technician at a local hospital and when on call, is required to be nofurther than 30 minutes away from the facility. Is the “on call” time, compensable?
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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- Patients are arriving at a clinic at a rate of two per minute. Each patient’s visit consists of four steps: check in, record vital signs, receive treatment, and check out. A receptionist takes 1 minute to check a patient in. A nurse takes 2 minutes to record the patient’s vital signs. A doctor spends 10 minutes with a patient. A staff member takes 3 minutes to check a patient out. What is the cycle time of the process in minutes?arrow_forwardSo how to calculate the following below: Avg. lateness = ? days Avg. completion time = ?? days Avg. number of jobs in the system = ? jobsarrow_forwardApply 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_forward
- 1/ Katie Posh runs an upscale nail salon. The service process includes five activities that are conducted in the sequence described below. (The time required for each activity is shown in parentheses):Activity 1: Welcome a guest. (1 minute)Activity 2: Clip and file nails. (3 minutes)Activity 3: Paint. (5 minutes)Activity 4: Dry. (10 minutes)Activity 5: Check out the customer. (4 minutes)Three servers (S1, S2, and S3) offer the services in a worker-paced line. The assignment of tasks to servers is the following: S1 does Activity 1. S2 does Activities 2 and 3. S3 does Activities 4 and 5. The drying process does not require server 3’s constant attention; she/he needs to only escort the customer to the salon’s drying chair (equipped with fans for drying). The time to do this is negligible. There exists only one drying chair in the salon.a. What is the utilization of server 2 (in decimal form)? Assume that there is unlimited demand and that the process only admits customers at the rate of…arrow_forwardJoe'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_forwardFive jobs are waiting for processing through two work centers. Their processing time (in minutes) at each work center is contained in the table below. Each job requires work center Alpha before work center Beta. According to Johnson's rule, which job should be scheduled first in the sequence? O A. V OB. U O C. R OD. S O E. T Job R S T Alpha 20 23 50 26 55 Beta 34 35 20 26 75arrow_forward
- If the 13th unit processed requires 87.00 minutes and the 26th unit requires 64.00 minutes, how much time would you estimate the 50th unit requires? (round to nearest whole number) Group of answer choices 35 minutes 48 minutes 18 minutes 55 minutes 40 minutesarrow_forwardYou observe a vehicle registration department at your local township. Assume that allemployees are ready to work at 9 a.m. You arrive at 9 a.m. sharp and are the first customer. Is your time through the empty process longer or shorter than the flow time averaged across all customers that arrive over the course of the day?a. Longer than the average flow timeb. Shorter than the average flow timearrow_forwardCurrently a company that designs Web sites has six customers in its backlog. The time since the order arrived, processing time, and promised due dates are given in the following table. Job Time Since Order Arrived (days ago) Processing Time (days) Due Date (days from now) A 6 18 48 B 4 22 52 C 1 30 70 D 10 14 28 E 7 12 56 F 5 20 62 Develop a schedule by using the first-come, first-served (FCFS) rule and calculate the average flow time and average days past due for the schedule. Develop a schedule by using the earliest due date (EDD) rule and calculate the average flow time and average days past due for the schedule. Comment on the performance of the FCFS and EDD rules relative to average flow time and average days past due.arrow_forward
- To control queue and make deadlines, two things are essential: must schedule and plan carefully , what are these ?arrow_forwardDepending on how jobs arrive to a resource, it is possible that the average flow time of the jobswith first-come-first-served is lower than that with shortest processing time. True or false?a. Trueb. Falsearrow_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 must 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 pick-up 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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