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business
operations management 6th
Operations Management 6th Canadian Edition William J Stevenson, Mehran Hojati, James Cao - Solutions
Develop an assignment plan for three workers that will minimize total cost, given the information shown below, and interpret your answer. WORKER A B 12 8 11 Job 2 13 10 8 3 14 14 4 10 7. 12 1,
MRP assumes infinite loading. Explain.
Assign five trucks to five delivery routes so that total cost is minimized, given the cost data shown below. What is the total cost? ROUTE A B C DE 1 8 7 2 6 4 8. 3 5 Truck 3 10 4 6. 4 2 5 8 5 6 5 3 00 4. 9. 3. 4,
How does your city sequence or prioritize snow plowing?
What is loading?
How do you schedule your homework assignments?
What is job scheduling?
Use the Hungarian method to determine the best way to assign three workers to three jobs, given the following cost information. Calculate the total cost for your assignment. JOB A B 1 5 8 6 Worker 6 7 9 3 4 5 3
Visit http://www.preactor.com/getdoc/bdd42227-ld4b-4660-ab8b-99b0005de92b/North-America.aspx. Choose a case study not used in the chapter and summarize it.
Visit a fast-food restaurant, a supermarket, a hospital, or another service and ask a manager about staff scheduling, covering these questions:a. Who does it?b. How frequently is it done?c. Is any software used and, if so, which software?d. How easy or difficult is it?e. Are demand forecasts
1. What are the advantages of the computerized open market system for bidding for shifts?2. What are the disadvantages of the computerized open market system for bidding for shifts?Zappos, the online shoe retailer with head office in Las Vegas, has over 200 call centre employees who work the
How should the production scheduler sequence the production of these products?The production scheduler of Scotsburn Dairy in Truro, NS, has just received a list of products and their desired lot size (the first week of MPS) from the operations coordinator to be produced next week. The aggregate
Consider the host/seater job in a full-service restaurant. Suppose that it takes an average of 2.5 minutes to greet a group of customers, check their reservation, and seat them. The expected number of new groups arriving during each hour on a particular day is given below.a. Determine the number of
The following table shows jobs to be processed at a machine. Determine the processing sequence that will minimize total number of late jobs. Processing Time Due Date Job (days) (days) A 3 4 5 5 10 D 2 11 E 4 13 20
Refer to Example 16-8. Use the shift scheduling heuristic to determine shifts for:a. Counter staff.b. Assembly board staff.
What is the fastest way to board the passengers on an aircraft?
Processing times (including setup times) for five jobs that arrived today and are waiting to be processed in the same order on three machines in a shop are given below. Determine the sequence of jobs that will likely minimize the make-span. Processing Time (hours) Job Machine 1 Machine 2 Machine 3
What takt time would match capacity and demand if demand is 120 units a day, there are two shifts of 480 minutes each, and workers are given three half-hour breaks during each shift, one of which is for lunch or dinner?
What are the benefits and risks of (a) small lot sizes, (b) standardized process, and (c) low inventories?
Level Operations is a small company that produces a variety of security devices and safes. The safes come in several different designs. Recently, a number of new customers have placed orders, and the production facility has been enlarged to accommodate the increased demand for the safes. The
What are (a) Takt time, (b) SMED, (c) Jidoka, (d) Poka-yoke?
What aspects of product design are important for TIT/lean?
Visit http://www.cbc.ca/news/health/simple-hospital-innovation-saves-time-money-1.1298578 to see an application of lean in a hospital. What happened in the hospital?
What are the key enablers for successful implementation of JIT/lean?
Visithttp://totalqualitymanagement.wordpress.com/2008/10/28/lean-production-system, and compare the concepts of JIT/lean production system there with the information given in the chapter.
View http://www.youtube.com/watch?v=3mcMwlgUFjU&feature=related and describe value stream mapping.
Was the service of WestJet JIT/lean?
Who in the company is affected by a decision to shift from an MRP system to a TIT/lean system?
What are the benefits of the cellular layout to Airline Manufacturing?Airline Manufacturing is a 275,000 ft2, 100-employee wood component manufacturer supplying upholsterers (e.g., sofa manufacturers), and is located in Columbus, Mississippi. When Judy Dunaway took the helm of the company following
Visit http://www.shingoprize.org/awards, choose a recentrecipient of the Shingo prize, and briefly summarize its JIT /lean program.
You need to plan the fabrication and assembly of an order of 40 side (accessory) tables due in six workdays. See the product structure tree that follows. The raw material is planks of oak measuring one inch by four inches by six feet long. The product structure tree below shows that one end table
A furniture maker has received an order for 100 units of its kitchen table to be delivered in six workdays. The table consists of one top and four legs, made from purchased lumber (2" by 6" by 6'). Each top is made from 1.5 units of lumber, and each leg is made from 1/6 unit of the lumber. Tops and
What are some unforeseen costs of the ERP implementation?
Explain the part-period method.
What is lot sizing and what is its goal?
What is back-flushing and why is it used?
What is pegging and why is it used?
What are planning and modular BOMs?
What is the difference between the determination of purchasing lead time and manufacturing lead time?
a. What are the requirements for these five items for the next 13 weeks?b. Is Zurn carrying too much inventory? Zurn makes various plumbing products such as fixtures, faucets, drainage equipment, and valves (under the Wilkins brand name). The plant manager is concerned with excessive amounts
Why should the planning horizon be at least as long as the cumulative lead time?
How can the use of MRP contribute to profitability?
The IT department has a problem. Its computer died just as it spat out the following information: Planned-order release for item J27 = 640 units in week 2. The company has been able to reconstruct all the information it lost except the production schedule for the end item 565. The company is
A company produces two products, A and B, that go through a three-step sequence of fabrication, assembly, and packaging. Processing requirements for the departments (hours per unit) are:Department capacities are all seven hours per day. The following production schedule is for the next three
Read http://www.ism.ws/files/RichterAwards /IBMSupportDocs2012.pdf about IBM's supply chain MRP, and explain its benefit to IBM.
Choose one of the following applications of MRP/ERP and determine the benefit of using the software:a. http://www.industrios.com/files/pdf/Success_Story_ Cam_ Tran. pdfb. http://www.epicor.com/Press-Room/Success-Story/CRS-Electronics.aspxc. https ://www.microsoft.com/en-ca/search/result
Why should future users of MRP, MRP II, or ERP software be involved in its selection and implementation?
Why are each of the following considerations an ERP software important?a. Ease of use.b. Complete integration.c. Data reliability.
What trade-offs are involved in customizing an ERP software?
Jet Spray Corp, now part of IMI Cornelius, manufactures dispensers for beverages. One of Jet Spray's best-known products is a two-product cold beverage dispenser, the twin Jet 3 (TJ3), which is made to stock. The following table shows part of the MPS record of TJ3 for the next seven weeks. Given
Lands' End is a phone/mail/Internet-order retailer of outdoor clothes and shoes. Like other retailers, Lands' End's customer orders surge just before Christmas. Therefore, Lands' End requires more employees just before Christmas. Jobs include customer sales and service, warehouse operations, and
Owens Corning Fiberglas (OCF) makes several types, weights, and widths of Fiberglas mats from chopped strands of fibreglass for boat hulls on two production lines in a plant.Aggregate planning for OCF involves choosing a certain number of shifts ( one to four shifts, or, equivalently, 40, 80, 120,
Minco Inc. is a small manufacturer of fused magnesia and silica.3 Minco's continuous improvement efforts led to a capacity and production planning software. To prepare for the use of software, a spreadsheet was first used to determine the capacity requirements for the main equipment (the fusion
Prepare an MPS table like Figure 13-12 using the following information: The forecast for each week of an eight-week schedule is 50 units. The MPS rule is to schedule production if the projected on-hand inventory would be negative without it. Customer orders (committed)are:Week
Update the MPS table shown in Figure 13-12 given these inputs: It is now the end of week 1; customer orders are 35 units for week 2, 16 tor week 3, 11 for week 4, 8 for week 5, and 3 for week 6. Inventory on hand is now 33 units. Use the MPS rule of ordering production when projected on-hand
The manager of an injection moulding shop is interested in using aggregate planning to determine the shop's production levels during each of the next four quarters. The shop uses eight moulding machines to produce approximately 150 different products, employing 18 permanent workers. Because of the
Prepare an MPS table for the pumps of Figure 13-12 using the same inputs but change the MPS rule from "Schedule production when the projected on-hand inventory would be negative without production" to "Schedule production when the projected on-hand inventory would be less than 10 units without
A small high-end swimwear manufacturer needs to plan for next year. Demand for swimwear (in units) follows a seasonal pattern:a. Determine the unit costs.b. Determine how many units the company will be short during each quarter if only permanent workers are used during regular time.c. Do a
Mity-Lite (ML) is a manufacturer of folding and stackable chairs and folding tables for social events. The demand for ML's products is seasonal, peaking in spring and summer. Suppose it is December now, and the production manager needs to prepare the production plan for the next 12 months (for
What is FTE? Give an example.
How is MPS for a process industry different?
What is a time fence and why is it useful?
A niche bicycle manufacturer manufactures bicycles in two different sizes. David, the company's owner-manager, has just received the following forecasts for the next six months.a. Under what circumstances is it appropriate to develop just one plan rather than two (one for each size)?b. Suppose
What is RCCP and why is it useful?
A spring-water bottling company has recently expanded into flavoured water. The marketing manager is predicting an upturn in demand based on the new offerings and the increased public awareness of the health benefits of drinking more water. She has prepared aggregate forecasts for the next six
Refer to Solved Problem 1. Start with 20 permanent workers. Prepare a minimum cost plan that may use some combination of hiring ($250 per worker), subcontracting ($8 per unit, maximum of 20 units per month, must use for at least three consecutive months), and overtime ($9 per unit, maximum of 25
What are the differences between aggregate operations planning for services and goods?
Give an example of a product with highly seasonal demand and discuss how its manufacturer meets the demand.
A small distiller produces whisky. The salesperson has developed the following forecasts for demand (in cases) for the next six months.Develop the minimum cost production plan using level output/workforce, supplemented with each of the following, and compute the total cost for each plan. Which plan
How does the trial-and-error approach for aggregate operations planning work?
A small company produces recreational vehicles. The marketing manager has developed the following forecasts (in units):Develop the minimum cost production plan and compute its total cost. Month Mar Apr May Jun Jul Aug Sep Total Forecast 50 44 55 60 60 40 50 359 Use the following information:
A manager would like to know the total cost of an aggregate production plan that meets the forecasts below using a steady regular production rate of 200 units a month, a maximum of 20 units per month of overtime, and subcontracting as needed to make up any shortages. The unit costs are:Regular
What are the most common decision variables for aggregate operations planning in a manufacturing setting? In a service setting?
A manufacturer of heavy truck engines must develop an aggregate production plan, given the following demand forecasts for engines. The company currently has 13 workers and makes 130 engines per month. Regular labour cost is $500 per engine. The beginning inventory is zero. Overtime labour costs
What is an equivalent unit and why is it used?
Many companies are using temporary workers to meet their peak demand. Is using temps instead of permanent workers ethically wrong? Briefly discuss.
Visit https://www.oliverwight-americas.com/system/files/clients/profiles/caterpillarna.pdf and http://oliverwightamericas. co ml system/files/ clients/ pro files/ caterpillarttt.pdf, and summarize how Caterpillar improved its planning.
How has technology had an impact on aggregate operations planning?
Why is there a need for operations planning?
a. What are the aggregate demand forecast and aggregate safety stock for each week, and the aggregate initial inventory?b. Using the result of part a, and available hours during regular time (80 hours per week) and overtime (36 hours per week), production rate of 1.14 hours per unit, setup time of
Visit http://www.kinaxis.com/Global/resources/case-studies/supply-chain-responsiveness-mtd-case-study-kinaxis.pdf, and summarize what RapidResponse is doing for MTD.
What feasible set of lot sizes for each family in each week will minimize total setup and holding cost? A feasible set of lot sizes will meet the demand during the next three weeks within 40-hour weeks. Assume that a week's demand for a family cannot be split between two weeks.The master scheduling
Visit http://info.steelwedge.com/rs/steelwedge/images/sw_sony_case_study_2014.pdf, and summarize how Sony Entertainment is using Steelwedge's planning software. Steelwedge was recently bought by E2open.
What is the minimum cost aggregate production plan for Scotsburn Dairy?Scotsburn Dairy's plant in Truro, Nova Scotia, makes over 300 types and sizes of ice cream and frozen yogurt products. The process is in two stages. In the frrst stage, a type of mix such as premium white is made in one of the
A major Saskatchewan potash producer ships potash from mines in Saskatchewan to several warehouses in North America by rail. The objective is to prevent stock-out at the warehouses. The demand from the warehouses is very hard to predict. It is rarely the same every day and is often impacted by
A grain elevator not only buys grains from nearby farmers but also sells them seeds and chemicals. But how much of each item will be sold in a given year is uncertain, making the decision on the purchase quantity difficult. Consider the ordering of a particular herbicide by a specific grain
Because there is a significant number of no-shows on a specific daily flight, the airline wants to intentionally overbook the flight. The number of no-shows can be described by a Normal distribution with a mean of 18 passengers and a standard deviation of 4.55 passengers. Profit per passenger is
Demand for Black Forest cake at the bakery of a supermarket can be approximated using a Poisson distribution with a mean of six per day. The manager estimates it costs $9 to prepare each cake. Fresh cakes sell for $12 each. Day-old cakes sell for $7 each. What stocking level is appropriate?
A hospital reorders size 7 surgical gloves when the supply on hand and on order falls to 18 units (pairs). Lead time for resupply is three days. Given the typical usage over the last 10 days below, what service level is achieved with the hospital's reorder policy?
A car service shop uses 1,200 cases of oil a year. Ordering cost is $20 per order, and annual holding cost is $3 per case. The shop owner has specified an annual service level of 99 percent.a. What is the EOQ?b. What level of ROP is appropriate if demand during a lead time is Normally distributed
Demand for a particular tablet at an electronics store has recently surged, and the store manager must recalculate at what inventory level to replenish it. The manager wants a probability of at least 96 percent of not having a stockout during a lead time. The manager expects demand to average a
A large electronics repair shop uses an average of 85 capacitors a day. The standard deviation is 5 units per day. The buyer follows this rule: Order when the amount on hand and on order drops to 625 units. Orders are delivered approximately six days after being placed. The delivery time is Normal
What are the echelons in the liquid makeup supply chain of Procter & Gamble?
What is an ASRS? Give an example.
Briefly describe the three methods used for multi-echelon inventory management.
Can the optimal stocking level in the single period model ever be less than median (i.e., 50th percentile) demand? Explain briefly.
How are the economic production quantity and its model different from EOQ and its model?
Explain briefly how a higher holding cost should result in more frequent orders.
Watch Moose Jaw Hospital's kanban video https://www.youtube.com/watch?v=EQW-zcLCllE and describe how its two bin system works.
What benefits do bar codes have for inventory management?
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