Operations Management Sustainability And Supply Chain Management Global Edition 12th Edition Jay Heizer, Barry Render, Chuck Munson - Solutions

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One important reason that spreadsheets are excellent tools for conducting simulations is that they can:a) generate random numbers.b) easily provide animation of the simulation.c) provide more security than manual simulations.d) prohibit “time compression” from corrupting the results.e) be
Two particularly good candidates to be probabilistic components in the simulation of an inventory problem are:a) order quantity and reorder point.b) setup cost and holding cost.c) daily demand and reorder lead time.d) order quantity and reorder lead time.e) reorder point and reorder lead time.
The five steps required to implement the Monte Carlo simulation technique are _______ , _______ , _______ , _______ , and _______ .
Which of the following is not an advantage of simulation?a) Simulation is relatively straightforward and flexible.b) Good simulation models are usually inexpensive to develop.c) “Time compression” is possible.d) Simulation can study the interactive effects of individual variables.e) Simulations
Will they be able to reduce cost for the online service?
Will they need to same amount of people working for the online service?
Compare the costs for these two situations. Use the same random numbers as in Problem F.20.
Repeat the simulation in Problem F.20, assuming that the reorder point is 4 units rather than
An web store of home products has two different suppliers for washing machines, Green-Clean (named A) and UltraClean (named B) They have a demand per day of the washing machines and the probability of choosing A is 0.7 and B 0.3 Delivery time for each of the retailers in days and probabilities
A nail salon is deciding if appointing an additional manicurist will be financially possible. Today, the nail salon has three manicurists, one which is only by appointment and the other two for drop in sessions. One session takes as in table $1
A x-ray system company have developed a new mammography system, with a revolutionary image processing part. They are in release mode and will build up a sale unit and a support unit. They want to set a price of 200 000 €, which is significantly higher than their competitors but since their system
Central Hospital in York, Pennsylvania, has an emergency room that is divided into six departments: (1) an initial exam station to treat minor problems or to make a diagnosis;(2) an X-ray department; (3) an operating room; (4) a cast-fitting room; (5) an observation room (for recovery and general
The time between arrivals at the drive-through window of Barry Harmon’s fast-food restaurant follows the distribution given in the table. The service-time distribution is also given.Use the random numbers provided to simulate the activity of the first 4 arrivals. Assume that the window opens at
Every home football game for the past 8 years at Southwestern University has been sold out. The revenues from ticket sales are significant, but the sale of food, beverages, and souvenirs has contributed greatly to the overall profitability of the football program. One particular souvenir is the
Leonard Presby’s newsstand uses naive forecasting to order tomorrow’s papers. The number of newspapers ordered corresponds to the previous day’s demands. Today’s demand for papers wa 22.-.-Presby buys the newspapers for $.20 and sells them for $.50. Whenever there is unsatisfied demand,
The number of cars arriving at Patti Miles’s Car Wash, in Orono, Maine, during the last 200 hours of operation is observed to be the following:a) Set up a probability and cumulative-probability distribution for the variable of car arrivals.b) Establish random-number intervals for the variable.c)
Phantom Controls monitors and repairs control circuit boxes on elevators installed in multistory buildings in downtown Chicago. The company has the contract for 108 buildings. When a box malfunctions, Phantom installs a new one and rebuilds the failed unit in its repair facility in Gary, Indiana.
Susan Sherer’s grocery store has noted the following figures with regard to the number of people who arrive at the store’s three checkout stands and the time it takes to check them out:Simulate the utilization of the three checkout stands over 5 minutes, using the following random numbers: 07,
A hospital near a large ski center in the Alps has a tremendous increase of wrist fractures during skiing season. To be more prepared for fast surgery they do a study about when people with broken wrists appear at the hospital and for how long their surgery will take. Simulate a week if the
Barbara Flynn sells papers at a newspaper stand for$.35. The papers cost her $.25, giving her a $.10 profit on each one she sells. From past experience Barbara knows that:a) 20% of the time she sells 100 papers.b) 20% of the time she sells 150 papers.c) 30% of the time she sells 200 papers.d) 30%
Time between incoming calls to a help desk can be seen as a Poisson distributed random variable with average 3 min and the duration can be seen as a discrete random variable as in table $2. Table $1 shows a cumulative distribution of incoming calls (made from a Poisson distribution) and Make a
Use these numbers to generate the number of breakdowns for 10 consecutive days.What proportion of these days had at least one breakdown?
The number of machine breakdowns per day at Yuwen Chen’s factory is 0, 1, or 2, with probabilities 0.5, 0.3, or 0.2, respectively. The following random numbers have been generated: 13, 14, 02, 18, 31, 19, 32, 85, 31, and
The daily demand for tuna sandwiches at an Ohio University cafeteria vending machine is 8, 9, 10, or 11, with probabilities 0.4, 0.3, 0.2, or 0.1, respectively. Assume the following random numbers have been generated: 09, 55, 73, 67, 53, 59, 04, 23, 88, and 84.Using these numbers, generate daily
Which reasons replaces an analytical model with a simulation model? Give examples from certain areas.
How many times do you need to run a Monte Carlo simulation to achieve an appropriate model. Why does it differ from model to model?
In the simulation of an order policy for drills at Simkin’s hardware ( Example F2 , pp. 797 – 799 ), would the results(of Table F.7 ) change significantly if a longer period were simulated? Why is the 10-day simulation valid or invalid?
What are the advantages of special-purpose simulation languages (see below)?
Why is simulation such a widely used technique?
List six ways that simulation can be used in business.
What is Monte Carlo simulation? What principles underlie its use, and what steps are followed in applying it?
Why might the results of a simulation differ each time you make a run?
Why is it a good reason using a cumulative distribution as an input into a Monte Carlo simulation model?
Explain the difference between simulated average demand and expected average demand.
What will an OM keep in mind when looking at the results from a simulation model?
What use may an OM have of a simulation model?
State the seven steps, beginning with “Defining the Problem,”that an operations manager should perform when using simulation to analyze a problem.
Which one of the following courses of action would not be taken by a firm wanting to pursue a learning curve steeper than the industry average?a) Following an aggressive pricing policyb) Focusing on continuing cost reductionc) Keeping capacity equal to demand to control costsd) Focusing on
During harvesting season a farmer has spent $3.85 to create the 1 st unit of peach crate for his agricultural produce, however he has spent only $2.46 to make the 19 th crate. Using the LearningCurve coefficients table, find the approximate learning-curve rate.a) 70%b) 75%c) 80%d) 85%e) 90%
An industrial construction firm with 80% learning has built its second warehouse for the same client by spending 200,000 man-hours. Using doubling approach, calculate how many man-hours were used for the first warehouse.a) 160,000b) 250,000c) 128,000d) 312,500e) 100,000
A learning curve describes:a) the rate at which an organization acquires new data.b) the amount of production time per unit as the total number of units produced increases.c) the increase in production time per unit as the total number of units produced increases.d) the increase in number of units
What are the limitations of the learning curve in this case?
How does SMT’s proposed learning rate compare with that of other industries?
What are the advantages and disadvantages to IBM and SMT from this approach?
Using the accompanying log-log graph, answer the following questions:a) What are the implications for management if it has forecast its cost on the optimum line?b) What could be causing the fluctuations above the optimum line?c) If management forecasted the 10th unit on the optimum line, what was
An aircraft engine manufacturing company spent 68,000 man-hours to produce the 1st unit of a turbo-engine.40,000 man-hours were spent on the 27th production. Calculate the learning curve rate using log formula method.
If the first unit of a production run takes 1 hour and the firm is on an 80% learning curve, how long will unit 100 take?( Hint: Apply the coefficient in Table E.3 twice.) PX
The service times for a new data entry clerk have been measured and sequentially recorded as shown below:a) What is the learning curve rate, based on this information?b) Using an 85% learning curve rate and the above times, estimate the length of time the clerk will take to complete the 48th
A manufacturer of special petrochemical equipment with a proven track record of 80% learning has estimated that it spent 12,000 labor-hours at $25.00 per labor-hour on the production of the 1st unit of a customized equipment. However, the company has realized that the production of the 5th unit of
Girish Shambu and William Reisel are teammates at a discount store; their new job is assembling bicycles for customers. Assembly of a bike has a learning rate of 90%. They forgot to time their effort on the first bike, but spent 4 hours on the second set. They have 6 more bikes to do. Determine
As the estimator for Rajendra Tibrewala Enterprises, your job is to prepare an estimate for a potential customer service contract. The contract is for the service of diesel locomotive cylinder heads. The shop has done some of these in the past on a sporadic basis. The time required to service the
Richard Dulski’s firm is about to bid on a new radar system. Although the product uses new technology, Dulski believes that a learning rate of 75% is appropriate. The first unit is expected to take 700 hours, and the contract is for 40 units. PXa) What is the total amount of hours to build the 40
If it took Boeing 28,718 hours to produce the eighth 787 jet and the learning-curve factor is 80%, how long did it take to produce the tenth 787?
Regional Power owns 25 small power generating plants. It has contracted with Genco Services to overhaul the power turbines of each of the plants. The number of hours that Genco billed Regional to complete the third turbine wa 460.Regional pays Genco $60 per hour for its services. As the maintenance
Central Electronics Corp. produces semiconductors and has a learning curve of .7. The price per bit is 100 millicents when the volume is .7 × 10 12 bits. What is the expected price at 1.4× 10 12 bits? What is the expected price at 89.6× 10 12 bits?
Using the data from Problem E.14, how long will it take to complete the 12th plane? The 15th plane? How long will it take to complete planes 12 through 15 inclusive? At $40 per hour, what can Alwan, as purchasing agent, expect to pay for planes 12 through 15?
Suad Alwan, the purchasing agent for Dubai Airlines, is interested in determining what he can expect to pay for airplane number 4 if the third plane took 20,000 hours to produce. What would Alwan expect to pay for plane number 5?Number 6? Use an 85% learning curve and a $40-per-hour labor charge?
The better students at Providence Assessment Center(see Problem E.12) have an 80% learning curve and can do a task in 20 minutes after just six times. You would like to weed out the weak students sooner and decide to evaluate them after the third unit. How long should the third unit take?
Providence Assessment Center screens and trains employees for a computer assembly firm in Boston. The progress of all trainees is tracked, and those not showing the proper progress are moved to less demanding programs. By the tenth repetition trainees must be able to complete the assembly task in 1
D. Shimshak Systems is installing networks for Advantage Insurance. The first installation took 46 labor-hours to complete. Estimate how long the 4th and the 8th installations will take for each of the following learning rates:a) 92%b) 84%c) 77%
The first vending machine that William Kine, Inc., assembled took 80 labor-hours. Estimate how long the fourth machine will require for each of the following learning rates:a) 95%b) 87%c) 72%
Professor Mary Beth Marrs took 6 hours to prepare the first lecture in a new course. Traditionally, she has experienced a 90% learning curve. How much time should it take her to prepare the 15th lecture?
Elizabeth Perry, a student at SUNY, bought 6 bookcases for her dorm room. Each required unpacking of parts and assembly, which included some nailing and bolting.
Manceville Air has just produced the first unit of a large industrial compressor that incorporated new technology in the control circuits and a new internal venting system. The first unit took 112 hours of labor to manufacture. The company knows from past experience that this labor content will
Refer to Problem E.5. Beth Zion Hospital has just been informed that only the first 10 transplants must be performed at the hospital’s expense. The cost per hour of surgery is estimated to be $5,000. Again, the learning rate is 80% and the first surgery took 30 hours.a) How long will the 10th
Beth Zion Hospital has received initial certification from the state of California to become a center for liver transplants. The hospital, however, must complete its first 18 transplants under great scrutiny and at no cost to the patients. The very first transplant, just completed, required 30
If it took 563 minutes to complete a hospital’s first cornea transplant, and the hospital uses a 90% learning rate, what is the cumulative time to complete:a) the first 3 transplants?b) the first 6 transplants?c) the first 8 transplants?d) the first 16 transplants?
If Professor Laurie Macdonald takes 15 minutes to grade the first exam and follows an 80% learning curve, how long will it take her:a) to grade the 25th exam?b) to grade the first 10 exams?
Temple Trucking Co. just hired Ed Rosenthal to verify daily invoices and accounts payable. He took 9 hours and 23 minutes to complete his task on the first day. Prior employees in this job have tended to follow a 90% learning curve. How long will the task take at the end of:a) the 2nd day?b) the
Susan Sherer, an IRS auditor, took 45 minutes to process her first tax return. The IRS uses an 85% learning curve.How long will the:a) 2nd return take?b) 4th return take?c) 8th return take?
What are the factors obstructing the application of Learning Curves?
Explain the concept of the doubling effect in learning curves.
Which processes tend to have steeper declining learning curves?
Why isn’t the learning-curve concept as applicable in a highvolume assembly line as it is in most other human activities?
Refer to Example E2. What are the implications for Great Lakes, Inc., if the engineering department wants to change the engine in the third and subsequent tugboats that the firm purchases?
What are the approaches to solving learning-curve problems?
Identify three applications of the learning curve.
What are some of the limitations of learning curves?
A company has one computer technician who is responsible for repairs on the company’s 20 computers. As a computer breaks, the technician is called to make the repair. If the repairperson is busy, the machine must wait to be repaired.This is an example of:a) a multiple-server system.b) a finite
If everything else remains the same, including the mean arrival rate and service rate, except that the service time becomes constant instead of exponential:a) the average queue length will be halved.b) the average waiting time will be doubled.c) the average queue length will increase.d) we cannot
Which of the following is not an assumption in a multipleserver queuing model?a) Arrivals come from an infinite, or very large, population.b) Arrivals are Poisson distributed.c) Arrivals are treated on a first-in, first-out basis and do not balk or renege.d) Service times follow the exponential
In performing a cost analysis of a queuing system, the waiting time cost is sometimes based on the time in the queue and sometimes based on the time in the system. The waiting cost should be based on time in the system for which of the following situations?a) Waiting in line to ride an amusement
Customers enter the waiting line at a cafeteria’s only cash register on a first-come, first-served basis. The arrival rate follows a Poisson distribution, while service times follow an exponential distribution. If the average number of arrivals is 6 per minute and the average service rate of a
Which of the following is not a key operating characteristic for a queuing system?a) Utilization rateb) Percent idle timec) Average time spent waiting in the system and in the queued) Average number of customers in the system and in the queuee) Average number of customers who renege
Which option do you recommend?
Determine the average amount of time that a guest spends checking in. How would this change under each of the stated options?
Should George have made the change in layout?
If casting personnel were paid $9.50 per hour and molding personnel were paid $11.75 per hour, how much could be saved per hour with the new factory layout?
How much time would the new layout save?
Vacation Inns, a chain of hotels operating in the southeastern region of the U.S., uses a toll-free telephone number to take reservations for all of its hotels. An average of 12 calls are received per hour. The probability distribution that describes the arrivals is unknown. Over a period of time,
weeks. Customers fill out 30 loan applications per week. On average how many loan applications are being processed somewhere in the system at Gamma Bank?29 Fisher’s Furniture Store sells $800,000 worth of furniture to customers on credit each month. The Accounts Receivable balance in the
Gamma Bank processes a typical loan application in
Lobster World stores approximately 1,000 pounds of fish on average. In a typical day, the busy restaurant cooks and sells 360 (raw) pounds of fish. How long do the fish stay in storage on average?
An average of 9 cars can be seen in the system (both the drive-through line and the drive-through window) at Burger Universe. Approximately every 20 seconds, a car attempts to enter the drive-through line; however, 40% of cars simply leave the restaurant because they’re discouraged by the length
During the afternoon peak hours the First Bank of Dubuque has an average of 40 customers arriving every hour.There is also an average of 8 customers at First Bank at any time.The probability of the arrival distribution is unknown. How long does the average customer spend in the bank?
The Chattanooga Furniture store gets an average of 50 customers per shift. Marilyn Helms, the manager, wants to calculate whether she should hire 1, 2, 3, or 4 salespeople.She has determined that average waiting times will be 7 minutes with one salesperson, 4 minutes with two salespeople, 3 minutes
Refer to Problem D.22. A new registration manager, Dwayne Cole, is hired who initiates a program to entertain the people in line with a juggler whom he pays $15/hour. This reduces the waiting costs to $50 per hour.a) What is the optimal number of servers?b) What is the cost for the system, per
The registration area has just opened at a large convention of dentists in Tallahassee, Florida. There are 200 people arriving per hour (Poisson distributed), and the cost of their waiting time in the queue is valued at $100 per person per hour. The Tallahassee Convention Center provides servers to
The Pontchartrain Bridge is a 16-mile toll bridge that crosses Lake Pontchartrain in New Orleans. Currently, there are 7 toll booths, each staffed by an employee. Since Hurricane Katrina, the Port Authority has been considering replacing the employees with machines. Many factors must be considered
Ted Glickman, the administrator at D.C. General Hospital emergency room, faces the problem of providing treatment for patients who arrive at different rates during the day.There are four doctors available to treat patients when needed.If not needed, they can be assigned other responsibilities (such

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Operations Management Sustainability And Supply Chain Management Global Edition 12th Edition Jay Heizer, Barry Render, Chuck Munson - Solutions

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