The determination and indetermination of service times in manufacturing systems
The notion of service times is of such fundamental importance in the analysis of queues that it has long been taken for granted. Intuitively, it is used to represent the time interval that a server is capable of completing a dispatched job. However, actua...
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sg-ntu-dr.10356-799172023-03-04T17:13:34Z The determination and indetermination of service times in manufacturing systems Wu, Kan Hui, Keung School of Mechanical and Aerospace Engineering DRNTU::Engineering::Industrial engineering::Operations research The notion of service times is of such fundamental importance in the analysis of queues that it has long been taken for granted. Intuitively, it is used to represent the time interval that a server is capable of completing a dispatched job. However, actual measurements of service times under simple queues in production lines have encountered practical difficulties, in spite of its seemingly deterministic nature. Previous studies have introduced concepts of effective process times to quantify service times. Besides notions of theoretical processing times, raw process times and queueing times, among others, are commonly used in various applications. Their existence causes confusion in the determination of service times and clarification of such terminologies is needed. A simple model is examined to quantify the various concepts and establish their interrelationships. This paper brings out new properties of effective process times with a dynamic dependence on utilization. Discrete event simulations are conducted to verify these properties and explain the phenomenon of indetermination of service times. Both theoretical prediction and simulation results show that unless the system is fully loaded, service time and effective process time are not equivalent and it cannot be measured directly from observations of effective process times. Accepted version 2011-10-11T04:05:33Z 2019-12-06T13:36:45Z 2011-10-11T04:05:33Z 2019-12-06T13:36:45Z 2008 2008 Journal Article Wu, K., & Hui, K. (2008). The Determination and Indetermination of Service Times In Manufacturing Systems. IEEE Transactions on Semiconductor Manufacturing, 21(1), 72-82. 0894-6507 https://hdl.handle.net/10356/79917 http://hdl.handle.net/10220/7207 10.1109/TSM.2007.914334 en IEEE transactions on semiconductor manufacturing © 2008 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at:http://dx.doi.org/10.1109/TSM.2007.914334. 11 p. application/pdf |
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DRNTU::Engineering::Industrial engineering::Operations research Wu, Kan Hui, Keung The determination and indetermination of service times in manufacturing systems |
description |
The notion of service times is of such fundamental importance
in the analysis of queues that it has long been taken for
granted. Intuitively, it is used to represent the time interval that a
server is capable of completing a dispatched job. However, actual
measurements of service times under simple queues in production
lines have encountered practical difficulties, in spite of its seemingly
deterministic nature.
Previous studies have introduced concepts of effective process
times to quantify service times. Besides notions of theoretical processing
times, raw process times and queueing times, among others,
are commonly used in various applications. Their existence causes
confusion in the determination of service times and clarification of
such terminologies is needed.
A simple model is examined to quantify the various concepts
and establish their interrelationships. This paper brings out new
properties of effective process times with a dynamic dependence
on utilization. Discrete event simulations are conducted to verify
these properties and explain the phenomenon of indetermination
of service times. Both theoretical prediction and simulation results
show that unless the system is fully loaded, service time and effective
process time are not equivalent and it cannot be measured
directly from observations of effective process times. |
author2 |
School of Mechanical and Aerospace Engineering |
author_facet |
School of Mechanical and Aerospace Engineering Wu, Kan Hui, Keung |
format |
Article |
author |
Wu, Kan Hui, Keung |
author_sort |
Wu, Kan |
title |
The determination and indetermination of service times in manufacturing systems |
title_short |
The determination and indetermination of service times in manufacturing systems |
title_full |
The determination and indetermination of service times in manufacturing systems |
title_fullStr |
The determination and indetermination of service times in manufacturing systems |
title_full_unstemmed |
The determination and indetermination of service times in manufacturing systems |
title_sort |
determination and indetermination of service times in manufacturing systems |
publishDate |
2011 |
url |
https://hdl.handle.net/10356/79917 http://hdl.handle.net/10220/7207 |
_version_ |
1759856290696265728 |