Abstract/Details

Optimal resource allocation in closed finite queueing networks with blocking after service


1997 1997

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Abstract (summary)

Research on the area of queueing networks has been extensive over the last decades. This is largely due to their ability to model many complex systems which are receiving growing attention such as flexible manufacturing systems, assembly lines, facility planning problems, computer and communication networks, transportation systems and so on. The focus of prior research has been on queueing networks with unrestricted storage or buffer capacities and queueing networks with restricted buffer capacities where external arrivals and departures are allowed, that is, open finite queueing networks. In contrast, the field of closed finite queueing networks, where no arrival to or departures from the system are allowed, has been relatively neglected due in part to their more difficult mathematical tractability. This dissertation represents a contribution to narrow this gap by concentrating on the important field of closed finite queueing networks and their optimization problems.

First, an efficient numerical approximation is developed to evaluate the performance measures of this type of network where blocking can occur after service. Secondly, the optimal resource allocation problem is addressed by combining mostly elements of queueing theory and nonlinear optimization.

The proposed approximation method is based on expanding and decomposing the closed network to account for the blocking phenomenon for which an adapted version of the Expansion Method is used in conjunction with a especially developed Equalization Phase and the well known Mean Value Analysis. This approximation is applicable to network topologies with tandem nodes or combinations of split and merge sequences that have exponential service times and one-server stations. The resulting numerical evaluations are computational efficient and render excellent results as compared to simulation results under a variety of testing conditions.

This method is then embedded in an optimization scheme to study the resource allocation problem with the objective of optimizing a nonlinear cost function that integrates system throughput, cycle time, and the number of buffer spaces in the network. The flexibility of this objective function provides for a potentially great number of applications. The emphasis here is however on manufacturing and communication systems.

The optimization procedure solves for the suboptimal buffer allocation at each node or station, and for the suboptimal number of customers or entities circulating in the closed queueing network. The solution to the buffer allocation problem is achieved via Powell's nonlinear unconstrained optimization, where necessary tests are provided to ensure deadlock-free solutions. Then, building upon this scheme, a search with backward and forward sweeps is applied to find the best setting for the number of customers. This problem is highly complex, since no known closed form expression exists for the objective function and because the problem is nonlinear and integral in nature. Discussions on the applicability, convergence, and computational analysis of the procedure are presented, as well as comparisons against pertinent simulation results.

Indexing (details)


Subject
Industrial engineering;
Operations research;
Mechanical engineering
Classification
0546: Industrial engineering
0796: Operations research
0548: Mechanical engineering
Identifier / keyword
Applied sciences, buffer allocation
Title
Optimal resource allocation in closed finite queueing networks with blocking after service
Author
Gonzales, Edgar Antonio
Number of pages
220
Publication year
1997
Degree date
1997
School code
0118
Source
DAI-B 58/09, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780591597677, 0591597675
Advisor
Smith, J. MacGregor
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9809339
ProQuest document ID
304357333
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304357333
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