Production and Operations Analysis, Seventh Edition
Production and Operations Analysis, Seventh Edition
7th Edition
ISBN: 9781478623069
Author: Steven Nahmias, Tava Lennon Olsen
Publisher: Waveland Press, Inc.
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Chapter 9, Problem 34AP
Summary Introduction

Interpretation: The sequence for the treatment of the patients for the minimization of the weighted value of the mean flow time is to be determined.

Concept Introduction:

Shortest processing time rule is used for the minimization of mean time flow of the project and hence it is used to minimize the time of mean flow of a process.

Tardiness is used to calculate the difference between the actual completion time and the required due date of the job. Any tardy jobs get completed after the due date of the job.

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The operation Management Computer Lab at the PUPR has two student software statistical package assignment assistant. The students form a single line to wait for help from the computer laboratory assistant. The students are helped first come, first served. On the average students arrive for help, following a triangular distribution (x1 5, y1 0).(x2 15, y2 ?) minutes. Each computer laboratory assistant, on the average can help 1 student per 15 minute (add all the numbers in your student ID) minutes and the service rate follow an exponential distribution. Determine Y2 or h. O a. H = 0.33 POb.H=2 OC.H=0.25 O d. H-0.2
Consider a workstation that has one maintenance mechanic to repair failed machines. We can think of the mechanic as the processor (scarce resource) and the machines awaiting repair as the jobs. Let us assume that six machines are down, with estimated repair times given here, and that no new machines fail. 2 3 4 Job (fix machine #) Processing time (hours) Compute the flow time for each job using both the FCFS rule and the SPT rule, and compare the average flow times. Round your answers for average values to the nearest whole number. 1 NO † 4 5 6 Sequence -Seled- Average flow time (FCFS rule): -Select- Y -Select- -Select- V FCFS Rule -Select- Y 7 1 Flow Time (hours) SPT rule Flow Time (hours) hours Average flow time (SPT rule): hours -Select- ✔ minimizes flow time and gets the most work done in the least amount of time.
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?
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