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作者：Pritchard, G; Zakeri, G
作者单位：University of Auckland; University of Auckland
摘要：This paper considers the problem of offering electricity produced by a series of hydroelectric reservoirs to a pool-type central market. The market model is a simplified version of the New Zealand wholesale electricity market, with prices modelled by a first-order Markov process. The demand for electricity is not explicitly modelled. The hydroelectric generator is assumed to be unable to influence market prices (i.e., to be a price-taker). We discuss the resulting stochastic dynamic program, m...
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作者：Andalaft, N; Andalaft, P; Guignard, M; Magendzo, A; Wainer, A; Weintraub, A
作者单位：Universidad de Chile; University of Pennsylvania; Universidad de Chile
摘要：we consider a problem of forest planning on pine plantations over a two to five year horizon. Basic decisions concern the areas to harvest in each period, the amount of timber to produce to satisfy aggregate demands for log exports, sawmills and pulp plants, and the roads to build for access and storage of timber. A linear programming model with 0-1 variables describes the decision process. Solution strategies involve strengthening of the model, lifting some of the constraints, and applying La...
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作者：Sherali, HD; Fraticelli, BMP; Meller, RD
作者单位：Virginia Polytechnic Institute & State University
摘要：This paper presents an improved mixed-integer programming (MIP) model and effective solution strategies for the facility layout problem and is motivated by the work of Meller et al. (1999). This class of problems seeks to determine a least-cost layout of departments having various size and area requirements within a rectangular building, and it is challenging even for small instances. The difficulty arises from the disjunctive constraints that prevent departmental overlaps and the nonlinear ar...
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作者：Lin, KY; Ross, SM
作者单位：Virginia Polytechnic Institute & State University; University of California System; University of California Berkeley
摘要：We consider a multiple-server loss model where customers arrive at a gatekeeper according to a Poisson process. A cost c is incurred if a new arrival is blocked from entering the system by the gatekeeper, while a larger cost K is incurred if an admitted customer finds all servers busy and therefore has to leave the system. The key assumption is that the gatekeeper is informed when an admitted customer finds all servers busy, but is not informed when served customers depart. Assuming an exponen...
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作者：Ghamlouche, I; Crainic, TG; Gendreau, M
作者单位：Universite de Montreal; Universite de Montreal; University of Quebec; University of Quebec Montreal; Universite de Montreal
摘要：we propose new cycle-based neighbourhood structures for metaheuristics aimed at the fixed-charge capacitated multicommodity network design formulation. The neighbourhood defines moves that explicitly take into account the impact on the total design cost of potential modifications to the flow distribution of several commodities simultaneously. Moves are identified through a shortest-pathlike network optimization procedure and proceed by redirecting flow around cycles and closing and opening des...
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作者：Lim, WS; Ou, JH; Teo, CP
作者单位：National University of Singapore; National University of Singapore
摘要：Consolidation of warehouses is a new trend in global logistics management, and the reduction in order processing and inventory costs is often cited as one of the main motivations. In this note we show that when retailers face constant demand rates and their ordering costs are independent of the warehouse that services them, consolidated systems are rarely suboptimal and always lead to close-to-optimal inventory replenishment costs. In particular, we prove that using two (one) properly selected...
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作者：Erhun, F; Tayur, S
作者单位：Stanford University; Carnegie Mellon University
摘要：We describe an enterprise-wide tool for tactical planning at a grocery retailer. The tool enables a total landed cost perspective by coordinating decisions across functions of the supply chain. It dynamically optimizes across logistics, purchasing, and warehouse management, while considering the necessary joint replenishment economies and accounting for a wide variety of complexities, such as discounts on total order quantity. intermittent demand, multiple distribution centers, vendor deals an...
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作者：Dillon, RL; Paté-Cornell, ME; Guikema, SD
作者单位：Georgetown University; Stanford University
摘要：Managers of complex engineering development projects face a challenge when deciding how to allocate scarce resources to minimize the risks of project failure. As resource constraints become tighter, balancing these failure risks is more critical, less intuitive, and can benefit from the power of quantitative analysis. This paper describes the Advanced Programmatic Risk Analysis and Management model (APRAM), a decision-support framework for the management of the risk of failures of dependent en...
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作者：Plambeck, EL; Zenios, SA
作者单位：Stanford University
摘要：This paper considers a principal-agent variant of the classical make-to-stock single-server queueing system. The principal incurs, all costs for holding inventory and backordering demand. The agent dynamically controls the production rate at the server and incurs a convex production cost. The principal cannot monitor the production rate but can draw inference from increases in the inventory level. Furthermore, by making payments contingent on the inventory level, the principal motivates the ag...
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作者：Cohn, AM; Barnhart, C
作者单位：University of Michigan System; University of Michigan; Massachusetts Institute of Technology (MIT)
摘要：Crew costs are the second-largest operating expense faced by the airline industry, after fuel. Thus, even a small improvement in the quality of a crew schedule can have significant financial impact. Decisions made earlier in the airline planning process, however, can reduce the number of options available to the crew scheduler. We address this limitation by delaying some of these earlier planning decisions-specifically, key maintenance routing decisions-and incorporating them within the crew s...
