排序方式: 共有76条查询结果,搜索用时 62 毫秒
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Murat Güngör 《海军后勤学研究》2016,63(4):346-348
For the single‐machine scheduling problem with the objective of simultaneously minimizing total flow time and number of tardy jobs, a lower bound on the number of efficient sequences is known. However, the proof thereof, which makes use of a modified version of Smith's algorithm, is unduly lengthy and sophisticated. Adopting a totally new point of view, we present in this short article a much simpler proof based on the naive idea of pairwise interchange. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 346–348, 2016 相似文献
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Traditional inventory systems treat all demands of a given item equally. This approach is optimal if the penalty costs of all customers are the same, but it is not optimal if the penalty costs are different for different customer classes. Then, demands of customers with high penalty costs must be filled before demands of customers with low penalty costs. A commonly used inventory policy for dealing with demands with different penalty costs is the critical level inventory policy. Under this policy demands with low penalty costs are filled as long as inventory is above a certain critical level. If the inventory reaches the critical level, only demands with high penalty costs are filled and demands with low penalty costs are backordered. In this article, we consider a critical level policy for a periodic review inventory system with two demand classes. Because traditional approaches cannot be used to find the optimal parameters of the policy, we use a multidimensional Markov chain to model the inventory system. We use a sample path approach to prove several properties of this inventory system. Although the cost function is not convex, we can build on these properties to develop an optimization approach that finds the optimal solution. We also present some numerical results. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008 相似文献
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辛郁和里尔克同名诗《豹》意象分析 总被引:1,自引:0,他引:1
现代派诗歌园地里有不少佳作,台湾诗人辛郁和奥地利诗人里尔克的同名诗《豹》就是其中名篇。分析它们的意象特征,可以进一步了解现代派文学的艺术特征,进而探讨现代诗歌与人们现实生活的某种联系,更准确地去欣赏现代诗歌艺术。 相似文献
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Stig Förster 《战略研究杂志》2013,36(2):209-230
Prof. Dr Werner Hahlweg (ed.), Carl von Clausewitz: Vom Kriege. Neunzehnte Auflage. Bonn: Duemmler, 1980. Pp. 1406; DM. 98.00.* Tony Ashworth, Trench Warfare 1914–1918. The Live and Let Live System. London: The Macmillan Press, 1980. Pp. 226; £15. Stephen Roskill, Admiral of the Fleet: Earl Beatty. London: Collins, 1980. Pp. 430; £12.95. R.J. Overy, The Air War 1939–1945. London: Europa Publications, 1980. Pp. 250; £12.50. Martin Binkin and Irene Kynakopoulos, Youth or Experience? Manning the Modern Military. Washington, D.C.: The Brookings Institution, 1980. Pp. 84; NP. Amos Perlmutter and Valerie Bennett (eds), The Political Influence of the Military. New Haven and London: Yale University Press, 1980. Pp. 508; £22.50; £6.90 (paperback). Edward M. Spiers, The Army and Society 1815–1914. Themes in British Social History. London: Longman, 1980. Pp. 318; £9.95, £5.75 (paperback). Richard K. Ashley, The Political Economy of War and Peace: The Sino‐Soviet‐American Triangle and the Modern Security Problematique. London: Frances Pinter, 1980. Pp. 384; £15. 相似文献
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Ilmari Käihkö 《Small Wars & Insurgencies》2013,24(2):248-270
In 1999, rebels rose to oppose the newly elected former warlord Charles Taylor in Liberia. Motivated by a variety of reasons, the minimal common denominator of these rebels, who assumed the name Liberians United for Reconciliation and Democracy (LURD), was that Charles Taylor must leave the country. The decentralized nature of LURD though stands out in their struggle, as they don't fit the unitary actor assumed by literature on strategy, nor the alternative conception of decentralized forces fighting for purely local reasons. Understanding such aberrations as LURD is the first step to finding strategies that can incorporate and manage them. 相似文献