Operations And Supply Chain Management The Core 3rd Edition F. Robert Jacobs, Richard Chase - Solutions

6 If an item is used in two places in a bill of material. say level 3 and level 4, what low-level code would be assigned to the item?
4 Period of time during which a customer has a speci- fied level of opportunity to make changes 5 This identifies the specific materials used to make each item and the correct quantities of each.
3 This drives the MRP calculations and is a detailed plan for how we expect to meet demand.
2 Logic used to calculate the needed parts, components. and other materials needed to produce an end item.
1 Term used for a computer system that integrates appli- cation programs for the different functions in a firm.
9 Why is the MRP process referred to as an "explosion"?
8 State the types of data that would be carried in the bill of materials file and the inventory. record file.
7 What are the sources of demand in an MRP system? Are these dependent or independent, and how are they used as inputs to the system?
6 "MRP just prepares shopping lists. It does not do the shopping or cook the dinner. Comment.
5 Discuss the importance of the master production schedule in an MRP system.
4 Contrast the significance of the term lead time in the traditional EOQ context and in an MRP system.
3 Should safety stock be necessary in an MRP system with dependent demand? If so, why? If not, why do firms carry it anyway?
2 Many practitioners currently update MRP weekly or biweekly. Would it be more valuable if it were updated daily? Discuss
I Discuss the meaning of MRP terms such as planned order release and scheduled order receipt.
10 The practice of allocating capacity and manipulating demand to make it more predictable.
9 In a service setting, what general operations-related variable is not available compared to a production setting?
8 Given the data from question 7, how many workers would be needed for a chase strategy?
7 If expected demand during the next four quarters is 150, 125, 100. 75 thousand units and each worker can produce 1,000 units per quarter: how many workers should be used if a level strategy is being employed?
6 Sometimes a firm may choose to have all or part of the work done by an outside vendor. This is the term used for the approach.
5 A strategy that uses inventory and hackorders as part of the strategy to meet demand.
3 A strategy where the production rate is set to match expected demand. 4 When overtime is used to meet demand and avoid the costs associated with hiring and firing
2 When doing aggregate planning, these are the three general operations-related variables that can be varied.
1 Term used to refer to the process a firm uses to bal- ance supply and demand.
8 How would you apply yield management concepts to a barbershop? A soft drink vending machine?
7 Review the opening vignette. How does sales and operations planning help resolve product shortage problems?
6 In what way does the time horizon chosen for an aggregate plan determine whether it is the best plan for the firm?
5 How does forecast accuracy relate, in general, to the practical application of the aggregate planning models discussed in the chapter?
4 Define yield management. How does it differ from the pure strategies in production planning?
3 Distinguish between pure and mixed strategies in production planning.
2 What are the basic controllable variables of a production planning problem? What are the four major costs?
1 What are the major differences between aggregate planning in manufacturing and aggregate planning in services?
10 If a firm increases its service capacity by 10 percent it would expect waiting times to be reduced by what percent? Assume customer arrivals and service times are random.
9 Firms that desire high service levels where custom- ers have short wait times should target server utiliza- tion levels at no more than this percent
8 What is the expected waiting time for the system de- scribed in question 6?
7 What is the average utilization of the servers in a sys- tem that has three servers? On average, 15 custom- ers arrive every 15 minutes. It takes a server exactly three minutes to wait on each customer.
6 Consider two queuing systems identical except for the service time distribution. In the first system the service time is random and distributed according to a Poisson distribution. The service time is constant in the second system. How would the waiting time differ in the two systems?
5 The queuing models assume that customers are served in what order?
4 This is done to make a system mistake-proof.
3 This is the key feature that distinguishes a service blueprint from a normal flowchart.
2 A framework that relates to the customer service sys- tem encounter.
1 Service systems can be generally categorized ac- cording to this characteristic that relates to the customer.
30 Wilshire Clinic has twenty clinicians. Currently, the arrival rate for each clinician is 2 patients per hour and the service rate for each clinician is 3 patients per hour. Both interarrival time and service time are exponentially distributed. Suppose each clinician serves his or her own
29 Bank of San Pedro has a drive-thru window with one teller. The arrival rate of customers to the drive-thru window is 8 customers per hour and the average service time is 6 minutes. Both interarrival time and service time follow exponential distributions.a. What is the utilization rate?b. What is
28 The Northern Emergency Computer Support has a call center with 10 customer service rep- resentatives. Historical statistics show that the durations of customer calls are exponentially distributed, and the average call duration is 20 minutes. Customer calls arrive according to a Poisson process.
27 Long Beach post office has 7 tellers from Monday through Saturday. Customers' arrival is a Poisson process, and the arrival rate is 36 customers per hour. The service time is exponen- tially distributed with mean 10 minutes.d. What is the utilization rate of the tellers?b. What is the average
26 Wendy's opens a drive-thru with one cashier and one food preparer. Customers will first enter the "place order" line to meet the cashier and then enter the "pick-up" line to get the food from the food preparer. Currently, the cashier can take an order in exactly 4 minutes and the food preparer
25 Since the deregulation of the airline industry, fierce competition has forced Global Airlines to reexamine their operations for efficiency and economy. As part of their campaign to improve customer service, they have focused on passenger check-in operations at the terminal. Global operates a
24 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
23 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
22 The California border inspection station (see Problem 21) is considering the addition of a second inspector. The vehicles would wait in one lane and then be directed to the first avail- able inspector. Arrival rates would remain the same (10 per hour) and the new inspector would process vehicles
21 At the California border inspection station, vehicles arrive at the rate of 10 per hour 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 hour in an exponentially distributed fashion.a.
20 A study-aid desk staffed by a graduate student has been established to answer students' ques- tions and help in working problems in your OSCM 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
19 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 distrib- uted time of two minutes. Assume
18 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
17 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
16 Benny the Barber (see problem 15) 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
15 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
14 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 min- utes. The time to
13 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
12 A cafeteria serving line has a coffee um from which customers serve themselves. Arrivals at the um 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
11 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
10 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
9 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
8 Sharp Discounts Wholesale Club is considering consolidating its two service desks (see Problem 7) 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
7 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
6 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 5). They are
5 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
4 What are the differences between high and low customer contact service (CCS) businesses. in general, for the dimensions listed below? (Example-Facility Layout: in a high CCS the facility would be designed to enhance the feelings and comfort of the customer, while in a low CCS the facility would
3 SYSTEM DESCRIPTION EXERCISE The beginning step in studying a productive system is to develop a description of that sys- tem. Once a system is described, we can better determine why the system works well or poorly and recommend production-related improvements. Because most of us are familiar with
2 Perform a quick service audit the next time you go shopping at a department store. Evaluate the three T's of service: the Task, the Treatment, and the Tangible features of the service on a scale of 1 (poor), 3 (average), and 5 (excellent). Remember that the tangible features include the
1. Place the following hospital activities/relationships on the service design matrix: physician/ patient, nurse/patient, billing, medical records, lab tests, admissions, diagnostic tests (such as X-rays).
4. Identify a familiar service that you frequently use. Develop a service blueprint (flowchart) similar to that shown in Exhibit 7.3. Would it be possible to analyze your service with the queuing models described in this chapter?
3. Take a visit to secondlife.com. Where do sales opportunities exist?
2. Identify the high-contact and low-contact operations of the following services:a. A dental office.b. An airline.e. An accounting office.d. An automobile agency.e. Amazon.com
1. Why should a manager of a bank home office be evaluated differently than a manager of a bank branch?
9 What is the efficiency of an assembly line that has 25 workers and a cycle time of 45 seconds? Each unit produced on the line has 16 minutes of work that needs to be completed based on a time study.com- pleted by engineers at the factory.
8 A firm is using an assembly line and needs to pro- duce 500 units during an eight-hour day. What is the required cycle time in seconds?
7 The relationship between how different layout struc- tures are best suited depending on volume and prod- uct variety characteristics is depicted on this type of graph
6 This is a production layout where similar products are made. Typically it is scheduled on an as-needed basis in response to current customer demand.
5 A finished goods inventory on average contains 10,000 units. Demand averages 1,500 units per week. Given that the process runs 50 weeks a year, what is the expected inventory turn for the inventory? Assume that each item held in inventory is valued at about the same amount.
4 If a production process makes a unit every two hours and it takes 42 hours for the unit to go through the entire process, then the expected work-in-process is equal to this.
3 A firm that designs and builds products from scratch according to customer specifications would have this type of production environment.
2 A point where inventory is positioned to allow the production process to operate independently of the customer order delivery process.
1. A firm that makes predesigned products directly to fill customer orders has this type of production environment.
6 What other issues might Toshihiro consider when bringing the new assembly line up to speed?
5 Can the assembly line produce 300 units per day without using overtime?
4 What about running the line at 300 units per day? If overtime were used with the engineers' initial de- sign, how much time would the line need to be run each day?
3 How should the line be redesigned to operate at the initial 250 units per day target, assuming that no overtime will be used? What is the efficiency of your new design?
2 When it is running at maximum capacity, what is the efficiency of the line relative to its use of labor? Assume that the "supporter" is not included in ef- ficiency calculations.
1 What is the daily capacity of the assembly line de- signed by the engineers? Assume that the assem- bly line has a computer at every position when it is started at the beginning of the day.
10 A key assumption related to the resources needed to complete activities when using the critical path method.
9 The procedure used to reduce project completion time by trading off time versus cost.
8 When activities are scheduled with probabilistic task times.
7 The difference between the late and early start time for an activity.
6 Activities that in sequence form the longest chain in a project.
5 A chart that shows both the time and sequence for completing the activities in a project.
4 Pieces of work in a project that consume time to complete.
3 This defines the hierarchy of project tasks, subtasks. and work packages.
2 Specific events that upon completion mark important progress toward completing a project.
1. A project structured where a self-contained team works full time on the project.

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Operations And Supply Chain Management The Core 3rd Edition F. Robert Jacobs, Richard Chase - Solutions

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