排序方式: 共有55条查询结果,搜索用时 15 毫秒
41.
Charles H. Reilly Clark A. Mount-Campbell Fernando Mata Eric K. Walton Eric A. Aebker Curt A. Levis 《海军后勤学研究》1991,38(6):779-797
We consider the problem of allotting locations in the geostationary orbit to communication satellites, subject to angle of elevation and electromagnetic interference constraints. An optimization framework is used as a means of finding feasible allotment plans. Specifically, we present a two-phase solution procedure for the satellite location problem (SLP). The objective in SLP is to allot geostationary orbital locations to satellites so as to minimize the sum of the absolute differences between the locations prescribed for the satellites and corresponding specified desired locations. We describe two heuristics, an ordering procedure and a k-permutation algorithm, that are used in tandem to find solutions to SLP. Solutions to a worldwide example problem with 183 satellites serving 208 service areas are summarized. 相似文献
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Charles E. Antoniak 《海军后勤学研究》1976,23(2):283-295
This paper discusses a possible measure of effectiveness for information sensing equipment, such as radar or sonar, based on its ability to provide information. It is shown that such a measure is particularly appropriate for situations where a sequence of similar limited engagements may occur, as on antisubmarine patrol, for example. In this case the measure expresses the expected rate of gain per engagement of the relative resources of the participants. Rates are calculated for the optimal and certain simpler, but suboptimal, strategies. The measure is illustrated by an exact analysis of a gambling problem and a qualitative treatment of an anti-missile missile allocation problem. 相似文献
43.
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
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Charles Tilquin 《海军后勤学研究》1975,22(4):777-785
This paper examines the (n, m) scheduling problem with n operations distributed among m machines. An algorithm for solving this problem is presented and, gives a good heuristic solution on a wide class of problems. Computational results are reported which demonstrate the efficiency of this approach. 相似文献
46.
Charles I. Tiplitz 《海军后勤学研究》1973,20(2):367-375
Calculating the solution for a mixed integer linear programming problem has been problematic for any sizable dimension because of the time required. Accordingly, an improved method for the fixed charge problem is presented here. The method is a modification of a bounding technique first suggested by Balinski, and it exploits fully the ratio of costio-use, first described by Cooper and Drebes. It exploits those local properties which have global application so that enumeration is confined to those relatively few combinations which cannot be evaluated otherwise. 相似文献
47.
When rational choice theory is applied to the study of terrorism, it is important that attention be given to the derived principles of constrained utility maximization. Particularly useful is the Slutsky equation, which rigorously analyzes the quantity response in one activity to a price change in another. By directing attention to assumptions and/or information about compensated cross price elasticities, expenditure shares, and income elasticities, the Slutsky equation can provide critical guidance in both theoretical and empirical analysis. 相似文献
48.
Charles Anderton 《Defence and Peace Economics》2013,24(3):209-222
This article is organized around two major topics addressed by nineteenth and early twentieth century economists: (1) international economic relations and war and (2) economic activity in the shadow of conflict. My thesis is that an early and neglected reservoir of economic thought on peace and war exists and valuable perspectives on research in defense and peace economics can be gained by tapping into it. 相似文献
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Charles Esdaile 《Small Wars & Insurgencies》2014,25(4):814-827
The Spanish Guerrilla (1808–1812) which has given its name to ideologically motivated insurgencies is usually portrayed as a patriotic uprising against the French occupation forces of Napoleon. It was that, in part, but also many other things besides. This case study illustrates its overlap and convergence with banditry but also with social unrest turned into uprisings directed by poor Spaniards against their creditors, as in the storming of Ronda by insurgents in 1810. From the propaganda of the day to the subsequent Spanish patriotic historiography, there has been a tendency to exaggerate the amplitude of events and also the damage that was done to the French forces and the casualty figures inflicted on them. 相似文献