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A model of an M/M/1, bulk queue with service rates dependent on the batch size is developed. The operational policy is to commence service when at least L customers are available with a maximum batch size of K. Arriving customers are not allowed to join in-process service. The solution procedure utilizes the matrix geometric methodology and reduces to obtaining the inverse of a square matrix of dimension K + 1 - L. For the case where the service rates are not batch size dependent, the limiting probabilities can be written in closed form. A numerical example illustrates the variability of the system cost as a function of the minimum batch service size L. 相似文献
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Wilfried von Bredow Christopher Dandeker Richard Connaughton Ruth Seifert Richard Mills 《Defense & Security Analysis》1992,8(2):217-224
Military Strategy in a Changing Europe: Towards the Twenty‐first Century.. Edited by Brian Holden Reid and Michael Dewar. Brassey's (UK), London (1991), ISBN 0–08–037706–8 £27.50 (US$49.95)
On Future War. By Martin van Creveld. Brassey's (UK), London (1991), ISBN 0–08–04179–65 £22.50 (US$38.25)
American and Soviet Intervention: Effects on World Stability. Edited by Karen A. Feste. Taylor and Francis, New York (1990), ISBN 0–8448–1632–9. £40.00
Soziale Deutungsmuster von Bataillonskommandeuren der Bundeswehr: Ein Beitrag zum beruflichen Selbstverstandnis einer militarischen Elite. By Georg‐Maria Meyer. Deutscher Universitätsverlag (1992)
The Laser in America: 1950–1970. By Joan Lisa Bromberg. MIT Press, Cambridge MA (1991), ISBN 0–262–02318–0, £26.95 相似文献
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The classical “Colonel Blotto” games of force allocation are generalized to include situations in which there are complementarities among the targets being defended. The complementarities are represented by means of a system “characteristic function,” and a valuation technique from the theory of cooperative games is seen to indicate the optimal allocations of defense and attack forces. Cost trade-offs between systems defense and alternative measures, such as the hardening of targets, are discussed, and a simple example is analyzed in order to indicate the potential of this approach. 相似文献
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Richard C. Morey 《海军后勤学研究》1975,22(3):455-460
This paper develops and illustrates an approximate approach for analytically assessing the impacts on both costs and service of consolidation of repair facilities. The repair facilities are two echelon generalizations of the classical repairmen problem in which two types of failures, say major and minor, can occur, each type requiring repair at a different echelon: The questions addressed are the reductions possible in spares, repairmen, and service rates due to the consolidated system's increased efficiency, as well as the physical separation between the users and the consolidated repair facility that is economical. The method of analysis is based upon asymptotic approximations developed for the repairmen problem, valid when the number of operational equipments is large (greater than 50); it is helpful since it provides a tractable means for predicting the steady-state performance of the decentralized and consolidated installations as a function of the many parameters involved without having to resort to an exhaustive computation of all the exact steady-state probabilities. 相似文献
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Consider an inventory system consisting of two installations, the stocking point and the field. Each period two decisions must be made: how much to order from outside the system and how much to ship to the field. The first decision is made based on the total amounts of stock then at the two installations. Next a forecast of the demand in the current period is sent from the field to the stocking point. Based upon a knowledge of the joint distribution of the forecast and the true demand, and the amounts of stock at the two installations, a decision to ship a certain amount of stock to the field is taken. The goal is to make these two decisions so as to minimize the total n-period cost for the system. Following the factorization idea of Clark and Scarf (1960), the optimal n period ordering and shipping policy, taking into account the accuracy of the demand forecasts, can be derived so as to make the calculation comparable to those required by two single installations. 相似文献