Concept explainers
a)
To determine: The best sequence for various rules.
b)
To calculate: The average completion time, average job lateness and the average number of jobs for the FCFS
c)
To calculate: The average completion time, average job lateness and the average number of jobs for EDD schedule.
d)
To calculate: The average completion time, average job lateness and the average number of jobs for the SPT schedule.
e)
To calculate: The average completion time, average job lateness and the average number of jobs for the LPT schedule.
f)
To explain: The best decision rule based on average completion time.
g)
To explain: The best decision rule based on average lateness.
Want to see the full answer?
Check out a sample textbook solutionChapter 15 Solutions
Pearson eText Principles of Operations Management: Sustainability and Supply Chain Management -- Instant Access (Pearson+)
- Which aspects of Priority Scheduling are comparable to those of Shortest Job First Scheduling?arrow_forwardEva, the owner of Eva's Second Time Around Wedding Dresses, currently has five dresses to be altered, shown in the order in which they arrived: Job VWX Y Z Processing Time (hrs) 7 1 9 3 5 Due (hrs from now) 5 1 4 2 3 If Eva uses the shortest processing time first (SPT) priority rule to schedule these jobs, what will be the average completion time?arrow_forwardWhich are the Principles of Workcenter Scheduling?arrow_forward
- Thomas has four assignments due in class tomorrow, and his class times are as follows. Class Time Marketing 304 8 am OM 385 10 am Finance 216 2 pm Psychology 4:30 pm Each class lasts one hour, and Thomas has no other classes. It is now midnight, and Thomas estimates that the marketing, OM, finance, and psychology assignments will take him six, three, four, and two hours, respectively. Use the Excel Sequencing template to determine how he should schedule the work. Can he complete all of it on time? (Hint: Using SPT and EDD. First, convert times to due dates past midnight).arrow_forwardWhich Priority Rules are used for Job Sequencing?arrow_forwardWhen compared to Shortest Job First Scheduling, in what ways does Priority Scheduling function similarly?arrow_forward
- 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 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_forwardAnalyze scheduling problems using priority rules and more specialized techniques.arrow_forwardA nursing home must schedule nurses in a manner that balances providing adequate patient care while keeping costs down. From historical records, administrators can project the minimum number of nurses to have on hand during each day/time slot. This data is shown below. Shift Time Slot Minimum number of nurses needed 1 12 am-4 10 2 4 am-8 6 3 8 am-12 8 4 12 pm-4 12 5 4 pm-8 10 6 8 pm-12 14 Nurses must start work at the beginning of one of the four-hour shifts (starting as early as 12 am midnight or as late as 8pm evening) and work for eight hours. Nurses who begin working at 8 pm will work until 4 am the next morning. Formulate and solve the nurse-scheduling problem so as to minimize excess stagging while satisfying minimum staffing requrements. What is the value of total excess staffing?arrow_forward
- Ron Satterfield's excavation company uses both Ganit scheduling charts and Gantt load charts. Today, which is the end of day 7, Ron is reviewing the Gantt chart depicting these schedules: Job #151 was scheduled to begin on day 3 and to take 5 days. It got started on time and is 1 day ahead of schedule. Job #177 was scheduled to begin on day 1 and take 4 days. It is currently on time. Job #179 was scheduled to start on day 6 and take 2 days. It actually got started on day 5 and is progressing according to plan. Job #211 was scheduled to begin on day 5, but missing equipment delayed it until day 6. It is progressing as expected and should take 3 days. Job #215 was scheduled to begin on day 5 and take 5 days. It got started on time but has since fallen behind 1 day. This exercise contains only part a a) Add the actual progress to the Gantt schedule shown on the right (on which the planned timings have been already plotted as blue lines). Using the line drawing tool, plot the actual…arrow_forwardRon Satterfield's excavation company uses both Gantt scheduling charts and Gantt load charts. Today, which is the end of day 7, Ron is reviewing the Gantt chart depicting these schedules: Job #151 was scheduled to begin on day 3 and to take 7 days. It got started on time and is 1 day ahead of schedule. Job #177 was scheduled to begin on day 3 and take 5 days. It is currently on time. Job #179 was scheduled to start on day 6 and take 3 days. It actually got started on day 5 and is progressing according to plan. Job #211 was scheduled to begin on day 5, but missing equipment delayed it until day 6. It is progressing as expected and should take 3 days. Job #215 was scheduled to begin on day 4 and take 5 days. It got started on time but has since fallen behind 2 days. This exercise contains only part a. a) Add the actual progress to the Gantt schedule shown on the right (on which the planned timings have been already plotted as blue lines). Using the line drawing tool, plot the actual…arrow_forwardsniparrow_forward
- Practical Management ScienceOperations ManagementISBN:9781337406659Author:WINSTON, Wayne L.Publisher:Cengage,Operations ManagementOperations ManagementISBN:9781259667473Author:William J StevensonPublisher:McGraw-Hill EducationOperations and Supply Chain Management (Mcgraw-hi...Operations ManagementISBN:9781259666100Author:F. Robert Jacobs, Richard B ChasePublisher:McGraw-Hill Education
- Purchasing and Supply Chain ManagementOperations ManagementISBN:9781285869681Author:Robert M. Monczka, Robert B. Handfield, Larry C. Giunipero, James L. PattersonPublisher:Cengage LearningProduction and Operations Analysis, Seventh Editi...Operations ManagementISBN:9781478623069Author:Steven Nahmias, Tava Lennon OlsenPublisher:Waveland Press, Inc.