1.Waiting lines are an important consideration in capacity planning. Waiting lines tie up additional resources (waiting space, time, etc.); they decrease the level of customer service: and they require additional capacity to reduce them. 2.Waiting lines occur whenever demand for service exceeds capacity (supply). Even in systems that are underloaded, waiting lines tend to form if arrival and service patterns are highly variable because the variability creates temporary imbalances of supply and demand. 3.All of the waiting line models presented in the chapter (except the constant service time model) assume, or require, that the arrival rate can be described by a Poisson distribution and that the service time can be described by a negative exponential distribution. Equivalently, we can say that the arrival and service rates must be Poisson, and the interarrival time and the service time must be exponential. In practice, one would check for this using a statistical Chi Square test: for problems provided here and in the textbook, assume that these distributions hold. Note that if these assumptions are not met, alternate approaches (e.g., intuition, simulation, other models) should be considered. 4.Much can be learned about the behavior of waiting lines by modeling them. A wide variety of models are presented in the text, different models pertain to different system characteristics. 5.A major distinction in waiting line models relates to whether the number of potential arrivals to the system is limited (finite) or unlimited (infinite). Perhaps the classic example of a finite source system is the machine, repairperson problem, wherein the server or servers handle calls for repairs on a small, fixed number of machines. Note that the definition of terms in Table 18-6 in the text follows this somewhat (e.g., average number running). Other examples of finite source systems include passengers on a plane...

...Waitinglinemanagement: unit 11.
The waitingline is a list of customers who remains waiting for getting certain goods or services from service center. Understanding waitinglines or queues and learning how to manage them is one of the most important areas in operation management. In organizations or in personal life, there are examples of processes which generates...

...Hong Kong University of Science and Technology
Industrial Engineering and Logistics Management
Final Year Project
WaitingLine Managementin Supermarket Check-Out Process
Group Member | : | Chan WaiNok |
| | Chow Yuen Ching |
| | Wong Wai Ki |
Project Advisor | : | Prof. Rachel Zhang |
Content
1. Introduction 3
1.1 WaitingLine System 3
1.2 Reasons for Managing the Waiting...

...T
Queues defined 243
Economics of the WaitingLine Problem
Cost-effectiveness balance The practical view of waitinglines
245
The Queuing System
Customer arrivals Distribution of arrivals The queuing system: factors Exit Queuing system defined Arrival rate defined Exponential distribution defined Poisson distribution defined Service rate defined
252 261 263 263
WaitingLine Models Approximating Customer...

...Ch 12. WaitingLine Models
Contents
1. Structure of WaitingLine System
2. Single-Channel WaitingLine Model with Poisson Arrivals and
Exponential Service Times
3. Multiple-Channel WaitingLine Model with Poisson Arrivals and
Exponential Service Times
4. Economic Analysis of WaitingLines
5. Other WaitingLine Models...

...Saint Louis University
School of Accountancy and Business Management
Mary Heights Campus, Bakakeng, Baguio City
Unlimited Network of Opportunities (UNO)
WaitingLineManagement Analysis
-------------------------------------------------
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In Partial Fulfillment for the Course
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Production and Operation Management...

...Page 217
C H A P T E R
WaitingLine and Queuing Theory Models
14
TEACHING SUGGESTIONS
Teaching Suggestion 14.1: Topic of Queuing. Here is a chapter that all students can relate to. Ask about student experiences in lines. Stress that queues are a part of our everyday lives and how things have changed at banks, post ofﬁces, and airports in just the past decade. (We now wait in a common line for the ﬁrst available server.)...

...REVISED
M14_REND6289_10_IM_C14.QXD 5/12/08 1:01 PM Page 218
218
CHAPTER 14
WAITINGLINE
AND
QUEUING THEORY MODELS
Alternative Example 14.3: A new shopping mall is considering setting up an information desk manned by two employees. Based on information obtained from similar information desks, it is believed that people will arrive at the desk at the rate of 20 per hour. It takes an average of 2 minutes to answer a question. It is assumed that...

...minutes a day waiting in line, which translates to 20 months of waiting in an 80-year lifetime (Wielenga 1997). Hong Kong is a high density city; we can see many places are full of queues. People queue up to get in the train, bus and taxi; wait for using toilet; deposit money in bank; purchase film ticket and pay money in supermarket etc.
Queuing is divided into two situations. The first situation is that people have little choice but queue, such...

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