4. A machining center in a job shop for a local fabrication company has five unprocessed jobsremaining at a particular point in time. The jobs are labeled 1, 2, 3, 4,and 5 in the order that theyentered the shop. The respective processing times and due dates are given in the table below.RuleFCFSSPTEDDCRa.Jobnumber Time12I.II.III.IV.Processing34511293112DueDate6145333132Determine the sequence of jobs, the average flow time, average tardiness and averagenumber of jobs at the work center for each of the following rules:FCFSSPTEDDCRSummarize the results for all four scheduling rules in the following table.b. Determine a sequence that will minimize the average tardiness.Average flowtime (days)AverageAverage number of jobs Sequencetardiness (days) at the work-center

Average flow time = Total flow time / number of jobsAverage tardiness = Total tardiness days /…

Answered: . A machining center in a job shop for…

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter2: Introduction To Spreadsheet Modeling

Section: Chapter Questions

Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...

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A machine center in a job shop for a local fabrication company has five unprocessed jobs remaining at a particular point in time. The jobs are labeled A, B, C, D, and E in the order that they entered the shop. The respective processing times and due dates are given in the table below. What is the sequence the of jobs by CR rules? Job Processing Time Due Date A 10 32 B. 55 34 C. 11 31 60 35
Currently a company that designs Web sites has five customers in its backlog. The time since the order arrived, processing time, and promised due dates are given in the following table. The customers are ready to be scheduled today, which is the start of day 190. Customer Time Since Order Arrived (days ago) Processing Time (days) Due Date (days from now) Upper AA 6 18 66 Upper BB 3 24 58 Upper CC 2 32 100 Upper DD 10 22 26 Upper EE 8 12 50 a. Develop separate schedules by using the FCFS and EDD rules. Compare the schedules on the basis of average flow time and average days past due. Part 2 Using the FCFS (first come, first served) decision rule for sequencing the customers, the order is: Sequence 1 2 3 4 5 Customer D E A B C Part 3 Using…
b. The Healthy Food Restaurant, a 24-hour restaurant, faces changing requirements from hour tohour. More workers are needed for peak hours, and fewer are needed in between. The followingTable 6 (below) shows the worker requirement for the first 12 hours in the restaurant:Table 6. Staff Requirement at the Healthy Food RestaurantTime Period 10AM11AM12PM1PM2PM3PM4PM5PM6PM7PM8PM9PMRequirement 8 10 12 12 9 7 6 7 9 10 12 8AssignedOn DutyOverstaffed8(i) You are required to apply the first-hour principle to staff each hour with the required number ofcafeteria staff, showing how many staff are on duty each given hour, the number of staffyou have assigned to work each hour and any overstaffing for each hour. i. Schedule the staff to work in 8-hour shifts.
The Hickory Company manufactures wooden desks. Manage-ment schedules overtime every weekend to reduce the backlogon the most popular models. The automatic routing machineis used to cut certain types of edges on the desktops. The fol-lowing orders need to be scheduled for the routing machine: The due dates reflect the need for the order to be at its nextoperation.a. Develop separate schedules by using the FCFS and EDDrules. Compare the schedules on the basis of average flowtime and average past due hours.b. Comment on the performance of the two rules relative tothese measures
Currently 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.
Currently a company that designs Web sites has five customers in its backlog. The day when the order arrived, processing time, and promised due dates are given in the following table. The customers are listed in the order of when they arrived. They are ready to be scheduled today, which is the start of day 190. Customer Time SinceOrder Arrived(days ago) ProcessingTime (days) Due Date(days fromnow) A B C D E 10 8 6 3 2 20 12 28 24 32 26 50 66 58 100 a. Develop separate schedules by using the FCFS and EDD rules. Compare the schedules on the basis of average flow time and average days past due.b. Comment on the performance of the two rules relative to these measures. Which one gives the best schedule? Why?
On Monday morning, Baxter Industries has the following jobs waiting for processing in two departments, milling, and drilling, in that order. Time Required (hours) Job Mill Drill 216 7 11 327 6 10 462 8 4 519 5 8 258 3 5 617 12 15 Develop a minimum makespan schedule using Johnson's rule. The schedule using Johnson's rule is - - - - - . Choose the correct Gantt chart with the minimum makespan schedule. The correct graph is .
WorkPro is a small manufacturer. It uses a job process for production. The following sample of jobs are listed in the order that they were received. Job Due Date Operation Time P 5 1 Q 20 8 R 8 5 S 11 6 T 3 12 When the shortest operating time (SOT) rule is applied to the sample of jobs, the resulting sequence is: A. Choos the following answer choice. T, P, R, S, Q R, S, T, P, Q P, Q, R, S, T P, R, S, Q, T B. In the WorkPro example above, average flow time for the sample of jobs when sequenced by the shortest operating time (SOT) rule is approximately: 19.8 14.2 4.8 6.4 C. In the WorkPro example above, average lateness for the sample of jobs when sequenced by the earliest due date (EDD) rule is approximately: Group of answer choices 10.4 4.8 7.8 5.8 D. Using the sample of jobs in the WorkPro example above, the shortest operating time (SOT) rule appears more attractive than the earliest due date (EDD) rule…
At the University Hospital, five blood samples must bescheduled through a blood-testing laboratory. Eachsample goes through up to four different testing stations.The times for each test and the due dates for eachsample are as follows:Sample Test Station/Hours Due Date (hours)1 A/1, B/2, C/3, D/1 62 B/2, C/3, A/1, D/4 103 C/2, A/3, D/1, C/2 84 A/2, D/2, C/3, B/1 145 D/2, C/1, A/2, B/4 12a. Using a Gantt chart, schedule these five samples in priority order of earliest due date first.b. Assume that the capacity of each test station (A, B, C and D) is doubled. Prepare an FCS for this situation.c. What are the bottleneck work centers in part a of the problem. Suggest capacity additions that might be needed.
Q5(a) Wonderloaf Bakery has orders for five specialty jobs A, B, C, D, and E that must be processed sequentially through two work centers baking and decoration. The amount of time in hours required for the jobs is shown in Table Q5(a). Determine the schedule sequence that minimizes the total elapsed time for five jobs using the following techniques; (i) Critical ratio; (ii) Johnson's Rule; Table Q5(a) Job (Orders Received) Processing time(hrs) Baking Hours remaining Decoration A 13 3 в 18 4 17 8 2 D 15 7 4 E 22 6 10
A 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?
A manufacturer is designing a product layout for a new product productionIt plans to use a production line for 8 hours per day in order to meet forecasted demand of 70 units per day. The product requires 7 tasks in total. These tasks are namelyABC, D, E, F, and Grespectively. Task A does not have any predecessor to startTo start Task B.it requires Task A to be completedStarting tasks needs, the task B to be completed. Also, starting task Dneeded task B to be completed. Task E can only start upon completion of Task C. Whereas starting task F needs the completion of both the tasks D and E. Finally, starting task G needed task Fto be completed. The processing times for tasks, ABC, D. E. and G are 2.8, 2.1, 0.9, 1.0, 1.2, 1.8 and 4.7 minutes respectively. What should be the cycle time in minutes? a 4.7 b. None is the correct answer Oc 7.5 d6.86 e.

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