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131.
Consider a two machine flow shop and n jobs. The processing time of job j on machine i is equal to the random variable Xij One of the two machines is subject to breakdown and repair. The objective is to find the schedule that minimizes the expected makespan. Two results are shown. First, ifP(X2j ≧ X1j) = 1 for all j and the random variables X11, X12,…, X1n are likelihood ratio ordered, then the SEPT sequence minimizes the expected makespan when machine 2 is subject to an arbitrary breakdown process; if P(X1j≧X2j) = 1 and X21, X22,….,X2n are likelihood ratio ordered, then the LEPT sequence minimizes the expected makespan when machine 1 is subject to an arbitrary breakdown process. A generalization is presented for flow shops with m machines. Second, consider the case where X1j and X2j are i.i.d. exponentially distributed with rate λj. The SEPT sequence minimizes the expected makespan when machine 2 is subject to an arbitrary breakdown process and the LEPT sequence is optimal when machine 1 is subject to an arbitrary breakdown process. © 1995 John Wiley & Sons, Inc. 相似文献
132.
A two-unit cold standby production system with one repairman is considered. After inspection of a failed unit the repairman chooses either a slow or a fast repair rate to carry out the corresponding amount of work. At system breakdown the repairman has an additional opportunity to switch to the fast rate. If there are no fixed costs associated with system breakdowns, then the policy which minimizes longrun average costs is shown to be a two-dimensional control limit rule. If fixed costs are incurred every time the system breaks down, then the optimal policy is not necessarily of control limit type. This is illustrated by a counterexample. Furthermore, we present several performance measures for this maintenance system controlled by a two-dimensional control limit rule. © 1993 John Wiley & Sons, Inc. 相似文献
133.
This article considers a special class of cost allocation problems, where the communication possibilities among the agents are restricted. Integral formulas are derived for two allocation rules: The Myerson value and the position value. © 1993 John Wiley & Sons, Inc. 相似文献
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A general Markovian model representing several multiple-unit redundant repairable systems is proposed and its transient behavior is studied. Specifically, for multiple-unit reliability system the reliability and availability functions are derived in an explicit form for the transient case. The stationary availability and mean time to system failure are deduced from the main results as special cases. 相似文献
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A number of results pertaining to preservation of aging properties (IFR, IFRA etc.) under various shock models are available in the literature. Our aim in this paper is to examine in the same spirit, the preservation of unimodality under various shock models. For example, it is proved that in a non-homogeneous Poisson shock model if {pk}K≥0, the sequence of probabilities with which the device fails on the kth shock, is unimodal then under some suitable conditions on the mean value function Λ (t), the corresponding survival function is also unimodal. The other shock models under which the preservation of unimodality is considered in this paper are pure birth shock model and a more general shock model in which shocks occur according to a general counting process. © 1999 John Wiley & Sons, Inc. Naval Research Logistics 46: 952–957, 1999 相似文献
139.
We discuss the problem of scheduling several jobs on a single machine with the objective of minimizing the weighted mean absolute deviation of flow times around the weighted mean flow time. We first show that the optimal schedule is W-shaped. For the unweighted case, we show that all optimal schedules are V-shaped. This characterization enables us to show that the problem is NP-hard. We then provide a pseudopolynomial algorithm for the unweighted problem. Finally, we consider three heuristic algorithms for the unweighted problem and report computational experience with these algorithms. © 1998 John Wiley & Sons, Inc. Naval Research Logistics 45: 297–311, 1998 相似文献
140.
The article explores Italian Air Force (ITAF) officers’ perceptions of military transformation and of changes in the global security environment. While several studies have addressed the challenges faced by European armed forces in the last two decades, the methods used have been rather uniform, mostly relying on in-depth case studies through qualitative interviews and analysis of strategic documents and budgets. Using data from an original, and unique, survey conducted among ITAF captains (N = 286), this article focuses on servicemen’s attitudes towards the transformations of the global security environment and the changes occurring (and needed) within the Italian Air Force. After describing the “military view” on these topics, the article provides preliminary statistical evidence on the links between individual experiences, views, and change. The research aims to contribute to the broader debate on military transformation by adding a novel dimension of analysis and providing new insights on the micro-level aspects of learning. 相似文献