Operations And Supply Management The Core 1st Edition Jacobs, F. Robert - Solutions

Examine Exhibit 10.3 and suggest which model you might use for (a) bathing suit demand,(b) demand for new houses, (c) electrical power usage, (d) new plant expansion plans.
What is the difference between dependent and independent demand?
What would you do to ensure that the operators were kept busy?
How do you think the machine operators would react to the change?
Eliminating the queue of work dramatically quickens the time it takes a part to flow through the system.What are the disadvantages of removing those queues?
Outline a plan for introducing lean at Quality Parts Company.
Sketch the operation of a pull system for running Quality Parts Company’s current system.
Make recommendations for lean improvements in such areas as scheduling, layout, kanban, task groupings, and inventory. Use quantitative data as much as possible; state necessary assumptions.
Which of the changes being considered by the manager of Quality Parts Company are counter to the lean philosophy?
Arvin Meritor is so pleased with the outcome from previous suggestions that the consultants are invited back for more work. The consultants now suggest a more complete robotic automation of the making of muffler assemblies and also a reduction in container size to eight per container. Arvin Meritor
Refer to Example 9.1 as the basis for this problem. Arvin Meritor hires a team of consultants.The consultants suggest a partial robotic automation as well as an increase in safety stock to 0.125. Arvin Automotive implements these suggestions. The result is an increase in efficiency in both the
A bottling plant fills 2,400 bottles every two hours. The lead time is 40 minutes and a container accommodates 120 bottles. The safety stock is 10 percent of expected demand.How many kanban cards are needed?
Transmissions are delivered to the fabrication line four at a time. It takes one hour for transmissions to be delivered. Approximately four vehicles are produced each hour, and management has decided that 50 percent of expected demand should be maintained as safety stock. How many kanban card sets
A supplier of instrument gauge clusters uses a kanban system to control material flow. The gauge cluster housings are transported five at a time. A fabrication center produces approximately 10 gauges per hour. It takes approximately two hours for the housing to be replenished. Due to variations in
Explain the relationship between quality and productivity under the lean philosophy.
Why is lean hard to implement in practice?
In which ways, if any, are the following systems analogous to kanban: returning empty bottles to the supermarket and picking up filled ones; running a hot dog stand at lunchtime;withdrawing money from a checking account; raking leaves into bags?
Explain how cards are used in a kanban system.
What are the roles of suppliers and customers in a lean system?
What are the implications for cost accounting of lean production?
What objections might a marketing manager have to uniform plant loading?
Discuss ways to use lean to improve one of the following: a pizza restaurant, a hospital, or an auto dealership.
Will lean work in service environments? Why or why not?
Why must lean have a stable schedule?
Stopping waste is a vital part of lean. Using value stream mapping, identify some sources of waste in your home or dorm and discuss how they may be eliminated.
Is it possible to achieve zero inventories? Why or why not?
If you could locate your new software development company anywhere in the world, which place would you choose, and why?
What are the pros and cons of relocating a small or midsized manufacturing firm (that makes mature products) from the United States to Mexico in the post-NAFTA environment?
How do facility location decisions differ for service facilities and manufacturing plants?
List five major reasons why a new electronic components manufacturing firm should move into your city or town.
What motivations typically cause firms to initiate a facilities location or relocation project?
Are there other alternatives that Pepe should consider?
Acting as an outside consultant, what would you recommend that Pepe do? Given the data in the case, perform a financial analysis to evaluate the alternatives that you have identified. (Assume that the new inventory could be valued at six weeks’ worth of the yearly cost of sales. Use a 30 percent
The U.S. Airfilter company has hired you as a supply chain consultant. The company makes air filters for residential heating and air-conditioning systems. These filters are made in a single plant located in Louisville, Kentucky, in the United States. They are distributed to retailers through
The McDonald’s fast-food restaurant on campus sells an average of 4,000 quarter-pound hamburgers each week. Hamburger patties are resupplied twice a week, and on average the store has 350 pounds of hamburger in stock. Assume that the hamburger costs $1.00 a pound.What is the inventory turnover
What are the basic building blocks of an effective mass customization program? What kind of companywide cooperation is required for a successful mass customization program?
Describe how outsourcing works. Why would a firm want to outsource?
What are the advantages of using the postponement strategy?
As a supplier, which factors about a buyer (your potential customer) would you consider to be important in setting up a long-term relationship?
What are characteristics of efficient, responsive, risk-hedging, and agile supply chains? Can a supply chain be both efficient and responsive? Risk-hedging and agile? Why or why not?
Describe the differences between functional and innovative products.
With so much productive capacity and room for expansion in the United States, why would a company based in the United States choose to purchase items from a foreign firm? Discuss the pros and cons.
What recent changes have caused supply chain management to gain importance?
What general steps should Hank follow in setting up a continuous improvement program for the company?What problems will he have to overcome to make it work?
What are the causes of the quality problems on the Greasex line? Display your answer on a fishbone diagram.
± .003 inches. After a trial run on this machine, C-Spec has determined that the machine has a sample mean of 4.001 inches with a standard deviation of .002 inch.a. Calculate the Cpk for this machine.b. Should C-Spec use this machine to produce this part? Why?
C-Spec, Inc., is attempting to determine whether an existing machine is capable of milling an engine part that has a key specification of
The following table contains the measurements of the key length dimension from a fuel injector. These samples of size five were taken at one-hour intervals. Construct a three-sigma X chart and R chart (use Exhibit 6.13) for the length of the fuel injector. What can you say about this process?
Some citizens complained to city council members that there should be equal protection under the law against the occurrence of crimes. The citizens argued that this equal protection should be interpreted as indicating that high-crime areas should have more police protection than low-crime areas.
months for one area:
The state and local police departments are trying to analyze crime rates so they can shift their patrols from decreasing-rate areas to areas where rates are increasing. The city and county have been geographically segmented into areas containing 5,000 residences. The police recognize that not all
Large-scale integrated (LSI) circuit chips are made in one department of an electronics firm.These chips are incorporated into analog devices that are then encased in epoxy. The yield is not particularly good for LSI manufacture, so the AQL specified by that department is 0.15 while the LTPD
patients with each meal, asking that they simply check off that the meal was either satisfactory or unsatisfactory. For simplicity in this problem, assume that the response was 1,000 returned questionnaires from the 1,200 meals each day. The results are as follows:
You are the newly appointed assistant administrator at a local hospital, and your first project is to investigate the quality of the patient meals put out by the food-service department. You conducted a 10-day survey by submitting a simple questionnaire to the
percent.a. When a shipment of Product X is received from Zenon Corporation, what sample size should the receiving department test?b. What is the allowable number of defects in order to accept the shipment?
percent and Zenon has a producer’s risk of
percent for component X. Alpha has a consumer’s risk of
percent. Zenon Corporation, from which Alpha purchases this component, has an acceptable quality level in its production facility of
In the past, Alpha Corporation has not performed incoming quality control inspections but has taken the word of its vendors. However, Alpha has been having some unsatisfactory experience recently with the quality of purchased items and wants to set up sampling plans for the receiving department to
samples were taken with four resistors in each sample. The complete list of samples and their measured values are as follows:
Resistors for electronic circuits are manufactured on a high-speed automated machine. The machine is set up to produce a large run of resistors of 1,000 ohms each.To set up the machine and to create a control chart to be used throughout the run,
per hour.If no inspector is used and defects are allowed to pass this point, there is a cost of $10 per unit to correct the defect later on.Should an inspector be hired?
percent error rate at a specific point in a production process. If an inspector is placed at this point, all the errors can be detected and eliminated. However, the inspector is paid $8 per hour and can inspect units in the process at the rate of
There is a
parts each were taken from an ongoing process to establish a p chart for control. The samples and the number of defectives in each are shown in the following table:
Ten samples of
Ametal fabricator produces connecting rods with an outer diameter that has a 1±.01 inch specification.Amachine operator takes several sample measurements over time and determines the sample mean outer diameter to be 1.002 inches with a standard deviation of .003 inch.a. Calculate the process
units per hour. The hourly rate including fringe benefits for this position is $9. If the inspection position is eliminated, defects will go into product assembly and will have to be replaced later at a cost of $10 each when they are detected in final product testing.a. Should this inspection
A company currently using an inspection process in its material receiving department is trying to install an overall cost reduction program. One possible reduction is the elimination of one inspection position. This position tests material that has a defective content on the average of 0.04. By
A manager states that his process is really working well. Out of 1,500 parts, 1,477 were produced free of a particular defect and passed inspection. Based on Six-Sigma theory, how would you rate this performance, other things being equal?
percent).
Discuss the trade-off between achieving a zero AQL (acceptable quality level) and a positive AQL (such as an AQL of
In the situation described in Question 3, what would be the effect on the cost of quality to the supplier?
In an agreement between a supplier and a customer, the supplier must ensure that all parts are within specification before shipment to the customer. What is the effect on the cost of quality to the customer?
Discuss the purposes of and differences between p charts and X and R charts.
The capability index allows for some drifting of the process mean. Discuss what this means in terms of product quality output.
Using a criterion that if the probability is greater than 1. percent, a backup OR team should be employed, make a recommendation to hospital administration.
Calculate the probability of zero patients in the system (P0), probability of one patient (P1), and the probability of two or more patients simultaneously arriving during the night shift.
Calculate the average customer arrival rate and service rate per hour.
A toll tunnel has decided to experiment with the use of a debit card for the collection of tolls.Initially, only one lane will be used. Cars are estimated to arrive at this experimental lane at the rate of 750 per hour. It will take exactly four seconds to verify the debit card.a. In how much time
During the campus Spring Fling, the bumper car amusement attraction has a problem of cars becoming disabled and in need of repair. Repair personnel can be hired at the rate of $20 per hour, but they only work as one team. Thus, if one person is hired, he or she works alone; two or three people work
The California border inspection station (see Problem 17) is considering the addition of a second inspector. The vehicles would wait in one lane and then be directed to the first available inspector. Arrival rates would remain the same (10 per minute) and the new inspector would process vehicles at
At the California border inspection station, vehicles arrive at the rate of 10 per minute in a Poisson distribution. For simplicity in this problem, assume that there is only one lane and one inspector, who can inspect vehicles at the rate of 12 per minute in an exponentially distributed fashion.a.
A study-aid desk staffed by a graduate student has been established to answer students’ questions and help in working problems in your OSM course. The desk is staffed eight hours per day. The dean wants to know how the facility is working. Statistics show that students arrive at a rate of four
An office employs several clerks who originate documents and one operator who enters the document information in a word processor. The group originates documents at a rate of 25 per hour. The operator can enter the information with average exponentially distributed time of two minutes. Assume the
Cathy Livingston, bartender at the Los Gactos Racquet Club, can serve drinks at the rate of one every 50 seconds. During a hot evening recently, the bar was particularly busy and every 55 seconds someone was at the bar asking for a drink.a. Assuming that everyone in the bar drank at the same rate
Customers enter the camera department of a store at the average rate of six per hour. The department is staffed by one employee, who takes an average of six minutes to serve each arrival. Assume this is a simple Poisson arrival exponentially distributed service time situation.a. As a casual
Benny the Barber (see Problem 11) is considering the addition of a second chair. Customers would be selected for a haircut on a FCFS basis from those waiting. Benny has assumed that both barbers would take an average of 20 minutes to give a haircut, and that business would remain unchanged with
Benny the Barber owns a one-chair shop. At barber college, they told Benny that his customers would exhibit a Poisson arrival distribution and that he would provide an exponential service distribution. His market survey data indicate that customers arrive at a rate of two per hour. It will take
The Judy Gray Income Tax Service is analyzing its customer service operations during the month prior to the April filing deadline. On the basis of past data it has been estimated that customers arrive according to a Poisson process with an average interarrival time of 12 minutes. The time to
L. Winston Martin (an allergist in Chicago) has an excellent system for handling his regular patients who come in just for allergy injections. Patients arrive for an injection and fill out a name slip, which is then placed in an open slot that passes into another room staffed by one or two nurses.
A cafeteria serving line has a coffee urn from which customers serve themselves. Arrivals at the urn follow a Poisson distribution at the rate of three per minute. In serving themselves, customers take about 15 seconds, exponentially distributed.a. How many customers would you expect to see on the
To support National Heart Week, the Heart Association plans to install a free blood pressure testing booth in El Con Mall for the week. Previous experience indicates that, on the average, 10 persons per hour request a test. Assume arrivals are Poisson from an infinite population. Blood pressure
The Bijou Theater in Hermosa Beach, California, shows vintage movies. Customers arrive at the theater line at the rate of 100 per hour. The ticket seller averages 30 seconds per customer, which includes placing validation stamps on customers’ parking lot receipts and punching their frequent
Burrito King (a new fast-food franchise opening up nationwide) has successfully automated burrito production for its drive-up fast-food establishments. The Burro-Master 9000 requires a constant 45 seconds to produce a batch of burritos. It has been estimated that customers will arrive at the
Sharp Discounts Wholesale Club is considering consolidating its two service desks (see Problem 3) into one location, staffed by two clerks. The clerks will continue to work at the same individual speed of four minutes per customer.a. What is the probability of waiting in line?b. How many customers,
Sharp Discounts Wholesale Club has two service desks, one at each entrance of the store.Customers arrive at each service desk at an average of one every six minutes. The service rate at each service desk is four minutes per customer.a. How often (what percentage of time) is each service desk
The managers of the Administrative Services Office estimate that the time a student spends waiting in line costs them (due to goodwill loss and so on) $10 per hour. To reduce the time a student spends waiting, they know that they need to improve Judy’s processing time (see Problem 1). They are
Students arrive at the Administrative Services Office at an average of one every 15 minutes, and their requests take on average 10 minutes to be processed. The service counter is staffed by only one clerk, Judy Gumshoes, who works eight hours per day. Assume Poisson arrivals and exponential service
Would you expect the Poisson distribution to be a good approximation ofa. Runners crossing the finish line in the Boston Marathon?b. Arrival times of the students in your OSM class?c. Arrival times of the bus to your stop at school?

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Operations And Supply Management The Core 1st Edition Jacobs, F. Robert - Solutions

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