4. A warehouse facility has packing stations at both its front and back entrances. The following table shows the number of ton-feet (in thousands) of materials handling that would be required to move each of the 6 pending jobs to either of the 2 stations, along with the number of hours packing that would be required at which- ever station does the work. Job 1 2 3 4 5 6 Front 21 17 10 30 40 22 Back 13 18 29 24 33 29 Time 44 60 51 80 73 67 Schedulers seek a minimum handling plan that completes all packing within the 200 hours available at the front station and 190 hours available at the back. Assume that jobs must go entirely to a single packing station. formulate the problem as a generalized assignment ILP and find the optimal solution.
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- A1 Credit provides credit information to its customersthroughout the country, 24 hours per day. Credit representativesanswer customer calls and provide information. Based on demandpatterns, the estimated number of representatives needed duringfour-hour time periods of each day are shown in the table. Employees work shift s of eight consecutive hours, and shift scan start at the beginning of any of the six periods shown inthe table. Assume this schedule will be repeated day aft er day,so that someone starting at 8 pm will contribute to the need forrepresentatives in the midnight–4 am time period. Th e supervisorhas been instructed to schedule employees so that all demandscan be met with a minimum possible number of employees.(a) Formulate an LP to minimize the number of representativesneeded.(b) Set up and solve the problem on a spreadsheet.(c) What is the optimal solution? Explain the rationale for thesolution.construct the oc curve for a single draw N=1,650; n=80 and c=2 for P=0%,0,5%, 1%, 1.5%,2%, 3%, 4%,5%,6%19. What combination of x and y will yield the optimum for this problem? Maximize $3x + $15y, subject to (1) 2x + 3y ≤ 12 and (2) 5x + 2y ≤ 10 and (3) x, y ≥ 0. Part 2 A. x = 0, y = 3 B. x = 2, y = 0 C. x = 0, y = 0 D. x = 0, y = 4 E. x = 1, y = 5
- A college provides free tutoring services for its students 7 days a week, and the daily requirements for tutors are: Day M T W Th F S Su Requirements 5 4 7 3 6 3 4 Find the minimum number of tutors required if each tutor works 4 days a week and has 3 consecutive days off. Give preference to Saturday and Sunday off in case of a tie. (Hint: Look for group of 3 days with the lowest requirements). Specify the work schedule for each tutor. How much slack does your schedule generate for each day?The Hickory Company manufactures wooden desks. Management schedules overtime every weekend to reduce the backlog on the most popular models. The automatic routing machine is used to cut certain types of edges on the desktops. The following orders need to be scheduled for the routing machine: Order Time SinceOrder Arrived(hours ago) EstimatedMachineTime (hours) Due Date(hours fromnow) 1 2 3 4 5 6 5 3 1 0 10 3 15 9 7 12 8 18 20 21 The due dates reflect the need for the order to be at its next operation.a. Develop separate schedules by using the FCFS and EDD rules. Compare the schedules on the basis of average flow time and average past due hours.b. Comment on the performance of the two rules relative to these measures.Planners for a company that makes several models of skateboards are about to prepare theaggregate plan that will cover six periods. They have assembled the following information.Period 1 2 3 4 5 6 TotalForecast 200 200 300 400 500 200 1,800CostsOutputRegular time = $2 per skateboardOvertime = $3 per skateboardSubcontract = $6 per skateboardInventory = $1 per skateboard per period on average inventoryBack orders = $5 per skateboard per periodThey now want to evaluate a plan that calls for a steady rate of regular-time output,mainly using inventory to absorb the uneven demand but allowing some backlog. Overtimeand subcontracting are not used because they want steady output. They intend to start withzero inventory on hand in the first period. Prepare an aggregate plan and determine its costusing the preceding information. Assume a level output rate of 300 units (skateboards) perperiod with regular time (i.e., 1,800/6 = 300). Note that the planned ending inventory iszero. There are 15…
- Gerald Glynn manages the Michaels Distribution Center. After careful examination of his database information, he has determined the daily requirements for part-time loading dock personnel. The distribution center operates 7 days a week, and the daily part-time staffing requirements are LOADING... Day M T W Th F S Su Requirements 7 4 4 4 6 2 2 Find the minimum number of workers Glynn must hire. Prepare a workforce schedule for these individuals so that each will have 2 consecutive days off per week and all staffing requirements will be satisfied. Give preference to the S-Su pair in case of a tie. (Note: If there is a tie that cannot be broken by following the preference to the S-Su pair, choose the pair closest to the beginning of the considered week.) The minimum number of workers is 77 workers. (Enter your…Gerald Glynn manages the Michaels Distribution Center. After careful examination of his database information, he has determined the daily requirements for part-time loading dock personnel. The distribution center operates 7 days a week, and the daily part-time staffing requirements are LOADING... Day M T W Th F S Su Requirements 7 4 4 4 6 2 2 Find the minimum number of workers Glynn must hire. Prepare a workforce schedule for these individuals so that each will have 2 consecutive days off per week and all staffing requirements will be satisfied. Give preference to the S-Su pair in case of a tie. (Note: If there is a tie that cannot be broken by following the preference to the S-Su pair, choose the pair closest to the beginning of the considered week.) The minimum number of workers is 44 workers. (Enter your…Gerald Glynn manages the Michaels Distribution Center. After careful examination of his database information, he has determined the daily requirements for part-time loading dock personnel. The distribution center operates 7 days a week, and the daily part-time staffing requirements are LOADING... Day M T W Th F S Su Requirements 7 4 4 4 6 2 2 Find the minimum number of workers Glynn must hire. Prepare a workforce schedule for these individuals so that each will have 2 consecutive days off per week and all staffing requirements will be satisfied. Give preference to the S-Su pair in case of a tie. (Note: If there is a tie that cannot be broken by following the preference to the S-Su pair, choose the pair closest to the beginning of the considered week.) The minimum number of workers is nothing workers. (Enter…
- 46. Ford is going to produce a new vehicle, the Pioneer,and wants to determine the amount of annual capacityit should build. Ford’s goal is to maximize the profitfrom this vehicle over the next five years. Each vehicle will sell for $19,000 and incur a variable production cost of $16,000. Building one unit of annual capacity will cost $2000. Each unit of capacity will alsocost $1000 per year to maintain, even if the capacityis unused. Demand for the Pioneer is unknown butmarketing estimates the distribution of annual demandto be as shown in the file P09_46.xlsx. Assume thatthe number of units sold during a year is the minimumof capacity and annual demand. Which capacity levelshould Ford choose? Do you think EMV is the appropriate criterion?Jane Reed bakes breads and cakes in her home for parties and other affairs on acontract basis. Jane has only one oven for baking. One particular Monday morningshe finds that she has agreed to complete five jobs for that day. Her husband Johnwill make the deliveries, which require about 15 minutes each. Suppose that shebegins baking at 8:00 A.M.Job Time Required Promised Time1 1.2 hr 11:30 A.M2 40 min 10:00 A.M.3 2.2 hr 11:00 A.M.4 30 min 1:00 P.M.5 3.1 hr 12:00 NOON6 25 min 2:00 P.M.Determine the sequence in which she should perform the jobs in order tominimizea. Mean flow time.b. Number of tardy jobs.c. Maximum lateness.A leatherworks factory has two punch presses for punching holes in the various leathergoods produced in the factory prior to sewing. Suppose that 12 different jobs must beprocessed on one or the other punch press (i.e., parallel processing). The processingtimes (in minutes) for these 12 jobs are given in the following table.Job 1 2 3 4 5 6 7 8 9 10 11 12Time 26 12 8 42 35 30 29 21 25 15 4 75Assume that both presses are initially idle. Compare the performance of SPT andLPT (longest processing time) rules for this example. (In parallel processing the nextjob is simply scheduled on the next available machine.)