Approximating reduced costs under degeneracy in a network flow problem with side constraints

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題名:	Approximating reduced costs under degeneracy in a network flow problem with side constraints
作者:	Yan,SY
貢獻者:	土木工程研究所
關鍵詞:	SENSITIVITY ANALYSIS;TOLERANCE APPROACH
日期:	1996
上傳時間:	2010-06-29 17:10:50 (UTC+8)
出版者:	中央大學
摘要:	Reduced costs obtained from the optimal simplex tableau are not necessarily correct under degeneracy in network flow problems with side constraints. In one application, simplex reduced costs were shown not to be good when applied to actual operations, while reoptimization to find all true reduced costs was too time-consuming. An efficient algorithm to obtain approximate reduced costs was developed in the research to offset these disadvantages. The algorithm combines the uses of Lagrangian relaxation, a minimum-cost network flow algorithm, and a shortest path algorithm. In theory, the approximate reduced costs prove to be a better lower bound than are simplex reduced costs. Numerical experiments have been performed to show its potential usefulness in practice. (C) 1996 John Wiley & Sons, Inc.
關聯:	NETWORKS
顯示於類別:	[土木工程研究所] 期刊論文

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