STEVENSON OPERATIONS MANAGEMENT W/CONNEC
14th Edition
ISBN: 9781264578306
Author: Stevenson
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Chapter 16, Problem 6DRQ
Why are priority rules needed?
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Note: A waiting line model solver computer package is needed to answer these questions.
The 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.)
La
=
L =
Wa
W =
h…
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…
Agan Interior Design provides home and office decorating assistance to its customers. In normal operation, an average of 2.6 customers arrive each hour. One design consultant is available to answer customer questions and make product recommendations. The
consultant averages 10 minutes with each customer.
(a) Compute the operating characteristics of the customer waiting line, assuming Poisson arrivals and exponential service times. (Round your answers to four decimal places. Report time in hours.)
λ=
μ =
=
L =
Wa
W =
P.
W
h
(b) Service goals dictate that an arriving customer should not wait for service more than an average of 5 minutes. Is this goal being met? (Round your answer to one decimal place.)
W₁ (in minutes) =
min, which is ---Select--- than the desired wait time, so the goal ---Select--- met.
What action do you recommend? (Select all that apply.)
Hire another consultant.
Increase the hours of operation.
Decrease the mean service rate.
Increase the mean service rate.
There is…
Chapter 16 Solutions
STEVENSON OPERATIONS MANAGEMENT W/CONNEC
Ch. 16 - Why is scheduling fairly simple for repetitive...Ch. 16 - Prob. 2DRQCh. 16 - What are Gantt charts? How are they used in...Ch. 16 - Prob. 4DRQCh. 16 - Briefly describe each of these priority rules: a....Ch. 16 - Why are priority rules needed?Ch. 16 - What problems not generally found in manufacturing...Ch. 16 - Explain forward and backward schedulings and each...Ch. 16 - Prob. 9DRQCh. 16 - Prob. 10DRQ
Ch. 16 - Prob. 11DRQCh. 16 - What general trade-offs are involved in sequencing...Ch. 16 - Prob. 2TSCh. 16 - Prob. 3TSCh. 16 - One approach that can be effective in reducing the...Ch. 16 - Doctors and dentists offices frequently schedule...Ch. 16 - Prob. 3CTECh. 16 - Use the assignment method to determine the best...Ch. 16 - Rework Problem 1, treating the numbers in the...Ch. 16 - Assign trucks to delivery routes so that total...Ch. 16 - Develop an assignment plan that will minimize...Ch. 16 - Use the assignment method to obtain a plan that...Ch. 16 - The following table contains information...Ch. 16 - Using the information presented in the following...Ch. 16 - The following table shows orders to be processed...Ch. 16 - A wholesale grocery distribution center uses a...Ch. 16 - The times required to complete each of eight jobs...Ch. 16 - Prob. 11PCh. 16 - A shoe repair operation uses a two-step sequence...Ch. 16 - The following schedule was prepared by the...Ch. 16 - The production manager must determine the...Ch. 16 - A foreman has determined processing times at a...Ch. 16 - Given the information in the following table,...Ch. 16 - Given the following information on job times and...Ch. 16 - Prob. 18PCh. 16 - The following table contains order-dependent setup...Ch. 16 - The following table contains order-dependent setup...Ch. 16 - Prob. 21PCh. 16 - Given this information on planned and actual...Ch. 16 - Given the following data on inputs and outputs at...Ch. 16 - Determine the minimum number of workers needed,...Ch. 16 - Determine the minimum number of workers needed,...Ch. 16 - Determine the minimum number of workers needed,...Ch. 16 - Prob. 1CQ
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