A framework for maintenance and replacement of a network structured system
Article Abstract:
The asset management problem of a network owner operating in a regulatory climate is discussed in this paper. Typically, the networks of interest are water distribution systems, gas pipeline networks, and electricity supply networks. We look at how network investment projects, relating to refurbishment or replacement of existing assets and network expansion, may be prioritised under capital rationing. The objectives for prioritising such projects will be influenced by the regulator; the regulator may set future performance targets, and set caps on charges and capital expenditure. The implications of capital rationing and the relationship between capital investment and future performance and operating costs are considered through the notion of the marginal "cost" of delaying projects. The effect of the uncertainty in the information that the owner currently possesses about the network is also addressed. An example is given to illustrate the framework presented. Keywords: Maintenance; Replacement; Networks; Asset management; Capital investment; Regulatory climate
Publication Name: International Journal of Production Economics
Subject: Engineering and manufacturing industries
ISSN: 0925-5273
Year: 2001
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Scheduling in the two-machine flowshop with due date constraints
Article Abstract:
The problem of minimizing either the maximum tardiness or the number of tardy jobs in a two-machine flowshop with due date considerations is known to be strongly NP-hard. A recent paper presented polynomial-time reductions from Partition to some restricted cases and concluded their ordinary NP-hardness. However, no pseudo-polynomial-time algorithm was developed. In this paper, we conduct polynomial-time reductions from 3-Partition to these special cases. The results confirm the strong NP-hardness of the problems under study. We also identify some other special cases as polynomially solvable by presenting their solution methods. [C] 2001 Elsevier Science B.V. All rights reserved. Keywords: Two-machine flowshop; Due date; Maximum tardiness; Number of tardy jobs; Strong NP-hardness
Publication Name: International Journal of Production Economics
Subject: Engineering and manufacturing industries
ISSN: 0925-5273
Year: 2001
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