Operations Management
17th Edition
ISBN: 9781259142208
Author: CACHON, Gérard, Terwiesch, Christian
Publisher: Mcgraw-hill Education,
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 18, Problem 6CQ
Summary Introduction
To determine: When there is greatest difference in average flow time between shortest processing time and first-come-first-served?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
1) Scheduling at Washburn Guitar
View the video Scheduling at Washburn Guitar (10.40 minutes, Ctrl+Click on the link); what are your key takeaways (tie to one or more of the topics discussed in Chapters 11 and/or 16) after watching this video.
Note: As a rough guideline, please try to keep the written submission to one or two paragraphs.
2) Bosa Limited, a specialist confectionary manufacturer, makes a variety of confectionary products candies in its manufacturing facility at Ulaanbaatar. Its line of confectionary products exhibits a highly seasonal demand pattern. The firm’s costs and quarterly sales forecasts are as follows: Costs: Hiring cost = $200 per worker, Firing cost = $600 per worker, Inventory carrying cost = $0.60 per pound per worker, Production per employee = 1000 pounds per quarter, Beginning workforce = 125 workers.
Quarter
Sales Forecast/
Demand(pounds)
Production
Spring
80,000
95,000
Summer
50,000
95,000
Fall
100,000
95,000…
Note: In chapter 11, section 11.3 of the Stevenson text, level and chase plans are covered with examples (example 1, and example 2); chapter 11 Stevenson lecture power point slides 23 to 32 cover chase and level plans with an example; see lecture video, 12.21 mins to 26.55 mins.
3)
a) Huurhun Printing in Ulaanbaatar has four typesetters and four jobs to be completed as given in the table. The $ entries represent the firm’s estimate of what it will cost for each job to be completed by each typesetter. Find the optimal assignment of jobs to typesetters so as to minimize the total costs.
Typesetters
Jobs
A
B
C
D
42HG
$7
$3
$4
$8
19DT
$5
$4
$6
$5
47ST
$6
$7
$9
$6
17VT
$8
$6
$7
$4
b) Huurhun Printing in Ulaanbaatar has the following printing jobs waiting to be processed at its work center. The jobs are assigned sequentially upon arrival. All dates are specified as days from today. In what sequence should the…
Galaxy Co. sells virtual reality (VR) goggles, particularly targeting customers who like to play video games. Galaxy procures each pair of goggles for $150 from its supplier and sells each pair of goggles for $300. Monthly demand for the VR goggles is a normal random
variable with a mean of 157 units and a standard deviation of 41 units. At the beginning of each month, Galaxy orders enough goggles from its supplier to bring the inventory level up to 140 goggles. If the monthly demand is less than 140, Galaxy pays $20 per pair of
goggles that remains in inventory at the end of the month. If the monthly demand exceeds 140, Galaxy sells only the 140 pairs of goggles in stock. Galaxy assigns a shortage cost of $40 for each unit of demand that is unsatisfied to represent a loss-of-goodwill among its
customers. Management would like to use a simulation model to analyze this situation. (Use at least 1,000 trials.)
(a) What is the average monthly profit (in dollars)? (Round your answer to the…
Chapter 18 Solutions
Operations Management
Ch. 18 - Prob. 1CQCh. 18 - Prob. 2CQCh. 18 - Prob. 3CQCh. 18 - Prob. 4CQCh. 18 - Prob. 5CQCh. 18 - Prob. 6CQCh. 18 - With weighted shortest processing time, jobs are...Ch. 18 - Prob. 8CQCh. 18 - Prob. 9CQCh. 18 - Prob. 10CQ
Ch. 18 - Prob. 11CQCh. 18 - Prob. 12CQCh. 18 - Prob. 13CQCh. 18 - Prob. 14CQCh. 18 - Prob. 15CQCh. 18 - Prob. 16CQCh. 18 - Prob. 1PACh. 18 - Prob. 2PACh. 18 - Prob. 3PACh. 18 - Prob. 4PACh. 18 - Prob. 5PACh. 18 - Prob. 6PACh. 18 - Prob. 7PACh. 18 - Prob. 8PACh. 18 - Prob. 9PACh. 18 - Prob. 10PACh. 18 - Prob. 11PACh. 18 - Prob. 12PACh. 18 - Prob. 13PACh. 18 - Prob. 14PACh. 18 - Prob. 15PACh. 18 - Prob. 1CCh. 18 - Prob. 2CCh. 18 - Prob. 3CCh. 18 - Prob. 4C
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, operations-management and related others by exploring similar questions and additional content below.Similar questions
- Hospital administrators must schedule nurses so that the hospital's patients are provided adequate care. At the same time, careful attention must be paid to keeping costs down. From historical records, administrators can project the minimum number of nurses required to be on hand for various times of day and days of the week. The objective is to find the minimum total number of nurses required to provide adequate care. Nurses start work at the beginning of one of the four-hour shifts given below (except for shift 6) and work for 8 consecutive hours. Hence, possible start times are the start of shifts 1 through 5. Also, assume that the projected required number of nurses factors in time for each nurse to have a meal break. Formulate and solve the nurse scheduling problem as an integer program for one day for the data given below. (Let x = number of nurses who start work at the beginning of shift t, t = 1, 2, 3, 4, 5.) Shift Time Minimum Number of Nurses Needed 1 12:00 A.M. - 4:00 A.M.…arrow_forwardThe Kolkmeyer Manufacturing Company uses a group of six identical machines, each of which operates an average of 23 hours between breakdowns. With randomly occurring breakdowns, the Poisson probability distribution is used to describe the machine breakdown arrival process. One person from the maintenance department provides the single-server repair service for the six machines. Management is now considering adding two machines to its manufacturing operation. This addition will bring the number of machines to eight. The president of Kolkmeyer asked for a study of the need to add a second employee to the repair operation. The service rate for each individual assigned to the repair operation is 0.40 machines per hour. (a) Compute the operating characteristics if the company retains the single-employee repair operation. (Round your answers to four decimal places. Report time in hours.) W L = q W = ✓ X h × h (b) Compute the operating characteristics if a second employee is added to the…arrow_forwardConsider the nonlinear optimization model stated below. Min 2x²-18x + 2XY + y² 14Y + 51 s.t. X + 4Y ≤7 (a) Find the minimum solution to this problem. at (X, Y) = (b) If the right-hand side of the constraint is increased from 7 to 8, how much do you expect the objective function to change? Based on the dual value on the constraint X + 4Y ≤7, we expect the optimal objective function value to decrease by (c) Resolve the problem with a new right-hand side of the constraint of 8. How does the actual change compare with your estimate? If we resolve the problem with a new right-hand-side of 8 the new optimal objective function value is , so the actual change is a decrease of rather than what we expected in part (b).arrow_forward
- Burger Dome sells hamburgers, cheeseburgers, french fries, soft drinks, and milk shakes, as well as a limited number of specialty items and dessert selections. Although Burger Dome would like to serve each customer immediately, at times more customers arrive than can be handled by the Burger Dome food service staff. Thus, customers wait in line to place and receive their orders. Burger Dome analyzed data on customer arrivals and concluded that the arrival rate is 40 customers per hour. Burger Dome also studied the order-filling process and found that a single employee can process an average of 56 customer orders per hour. Burger Dome is concerned that the methods currently used to serve customers are resulting in excessive waiting times and a possible loss of sales. Management wants to conduct a waiting line study to help determine the best approach to reduce waiting times and improve service. Suppose Burger Dome establishes two servers but arranges the restaurant layout so that an…arrow_forward>>>> e 自 A ? ↑ G סוי - C Mind Tap Cengage Learning CENGAGE MINDTAP Chapter 12 Homework: Managing Inventories in Supply Chains Assignment: Chapter 12 Homework: Managing Inventories in Supply Chains Questions Problem 12-70 Algo (Managing Fixed-Quantity Inventory Systems) 6. 7. ng.cengage.com + O C Excel Online Student Work Q Search this course ? Save Assignment Score: 91.34% Submit Assignment for Grading e Question 8 of 11 ▸ A-Z Hint(s) Check My Work 8. 9. 10. 11. Spreadsheet Environmental considerations, material losses, and waste disposal can be included in the EOQ model to improve inventory-management decisions. Assume that the annual demand for an industrial chemical is 1,600 lb, item cost is $2/lb, order cost is $45, inventory holding cost rate (percent of item cost) is 15 percent. Use the EOQ Model Excel template in MindTap to answer the following: a. Find the EOQ and total cost, assuming no waste disposal. Do not round intermediate calculations. Round your answer for the EOQ to…arrow_forward>>>> G סוי - C Mind Tap Cengage Learning CENGAGE MINDTAP Chapter 12 Homework: Managing Inventories in Supply Chains Questions Problem 12-44 Algo (Managing Fixed-Quantity Inventory Systems) 1. e 2. 3. 自 4. 5. ? ↑ 6. 7. 8. 9. 10. 11. ng.cengage.com + O C Excel Online Student Work Q Search this course ? Question 3 of 11 ► Hint(s) Check My Work Brenda opened a pool and spa store in a lively shopping mall and finds business to be booming but she often stocks out of key items customers want. The 28-ounce bottle of Super Algaecide (SA) is a high margin SKU, but it stocks out frequently. Ten SA bottles come in each box, and she orders boxes from a vendor 160 miles away. Brenda is busy running the store and seldom has time to review store inventory status and order the right quantity at the right time. She collected the following data: Demand = 9 boxes per week Order cost = $90/order Store open = 48 weeks/year Lead-time = 3 weeks Item cost = $180/box Inventory-holding cost = 10 percent per…arrow_forward
- ווח CENGAGE MINDTAP G Chapter 09 Excel Activity: Exponential Smoothing Question 1 3.33/10 A e Submit 自 ? G→ Video Excel Online Tutorial Excel Online Activity: Exponential Smoothing ng.cengage.com Q Search this course ? A retail store records customer demand during each sales period. The data has been collected in the Microsoft Excel Online file below. Use the Microsoft Excel Online file below to develop the single exponential smoothing forecast and answer the following questions. X Open spreadsheet Questions 1. What is the forecast for the 13th period based on the single exponential smoothing? Round your answer to two decimal places. 91.01 2. What is the MSE for the single exponential smoothing forecast? Round your answer to two decimal places. 23.50 3. Choose the correct graph for the single exponential smoothing forecast. The correct graph is graph A ☑ Back Observation Exponential Smoothing Forecast 100 Forecast 95 95 90 90 A-Z Office Next A+arrow_forwardThe City Commission of Nashville has decided to build a botanical garden and picnic area in the heart of the city for the recreation of its citizens. The precedence table for all the activities required to construct this area successfully is as follows: A Time B- Code Description (hrs) Immediate Predecessor(s) A Find location; determine resource requirements 20 None B Requisition of lumber and sand 65 A C Dig and grade 100 A D Saw lumber into appropriate sizes 30 B E Position lumber in correct locations 25 D, C F Nail lumber together E G Put sand in and under the equipment 25 F H H Put dirt around the equipment 10 F Put grass all over the garden, landscape, paint 35 G, H Refer to the legend for the activity that corresponds to each code. Using the line drawing tool, draw a Gantt chart for activities E through I of the project. 0 20 40 60 80 100 120 140 160 180 200 220 Clear allarrow_forwardList three forms of pay you receive (not dollar amounts). Compare your list to two of your peers. Discuss any differences or similarities that you noticed. NO AIarrow_forward
- Please and thank youarrow_forwardA local fast-food restaurant processes several customer orders at once. Service clerks’ cross paths, sometimes nearly colliding, while they trace different paths to fill customer orders. If customers order a special combination of toppings on their burgers, they must wait quite some time while the special order is cooked. How would you modify the restaurant’s operations to achieve competitive advantage? Because demand surges at lunchtime, volume flexibility is a competitive priority in the fast-food business. How would you achieve volume flexibility? What are the potential downsides of relying too heavily on automation and standardization in this industry? What data would you want to gather, if any, before making recommendations?arrow_forwardWhat are 4 key points that are interesting about this video https://youtu.be/LAoMuvYZ_QM?si=Mognj_KBU9EIOLSParrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Practical Management ScienceOperations ManagementISBN:9781337406659Author:WINSTON, Wayne L.Publisher:Cengage,
MarketingMarketingISBN:9780357033791Author:Pride, William MPublisher:South Western Educational Publishing
Practical Management Science
Operations Management
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:Cengage,
Marketing
Marketing
ISBN:9780357033791
Author:Pride, William M
Publisher:South Western Educational Publishing