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In this article, we study a two‐level lot‐sizing problem with supplier selection (LSS), which is an NP‐hard problem arising in different production planning and supply chain management applications. After presenting various formulations for LSS, and computationally comparing their strengths, we explore the polyhedral structure of one of these formulations. For this formulation, we derive several families of strong valid inequalities, and provide conditions under which they are facet‐defining. We show numerically that incorporating these valid inequalities within a branch‐and‐cut framework leads to significant improvements in computation. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 647–666, 2017 相似文献
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介绍了海军特种作战军事概念格式化描述的方法.对海军特种作战军事概念格式化描述的要求进行深入分析,得出格式化描述的基本思路:用面向对象的方法对海军特种作战军事行动进行分解,给出一套规范和格式,使军事人员对军事行动的格式化表述清晰地提供出技术人员所熟悉的面向对象的概念和机制.根据这种思路对海军特种作战军事行动进行分析,抽取出格式化描述的五个要素:作战单位、动作、作战行动、信息和作战环境,从而建立海军特种作战军事概念格式化描述的框架并详细研究了上述五个要素的描述框架和模板结构. 相似文献
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滕明生 《国防科技大学学报》1989,11(4):114-122
文中运用传热学理论,用电模拟法建立了FECL100K24线陶瓷扁平封装组件在强迫风冷条件下的等效热路,并在此基础上推算出其热传递数学模型,为电子计算机辅助热设计提供了基础。文中还运用所建立的等效热路和数学模型,对该组件在电子设备中安装形式的合理性进行了论证。 相似文献
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Edward Katumba‐Wamala 《Small Wars & Insurgencies》2013,24(3):160-171
Africa has had no shortage of guerrilla movements since 1975. However, very few have been successful that have not fought against European colonial rule or white minority regimes. Fundamentally, without external support, these movements have been almost universally failures. One major exception to this rule was the National Resistance Army of Uganda, which overthrew the regime led by General Tito Okello in 1986. What made the National Resistance Army a success and distinct from other guerrilla armies were its sound leadership, its superior organization and its creative strategy. 相似文献
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David A. Charters Sam C. Sarkesian Daniel W. Fitz‐Simons 《Small Wars & Insurgencies》2013,24(2):280-286
A. Hamish Ion and E.J. Errington (eds.), Great Powers and Little Wars: the Limits of Power. Westport, CT: Praeger, 1993. Pp.246, select biblio, index. $49.95. ISBN 0275–93965–0 John M. Rothgeb, Jr., Defining Power: Influence and Force in the Contemporary International System. New York: St. Martin's Press, 1993. Pp.205. $39.95 (hbk); $18.70 (pbk). ISBN 0312–086–822 and 061–056 Brian L. Job (ed.), The Insecurity Dilemma: National Security in Third World States. Boulder, CO: Lynne Rienner Publishers, 1992, Pp.257. $37. ISBN 1–55587–267–0 Edwin G. Corr and Stephen Sloan (eds.), Low‐Intensity Conflict: Old Threats in a New World. Westview Studies in Regional Security, Boulder, CO: Westview, 1992. Pp.310, maps, figures, index. $55 (hbk); $18.85 (pbk). ISBN 0–8133–8593–8 and 8594–6 相似文献
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Uri Bar‐Joseph 《战略研究杂志》2013,36(3):46-66
According to common wisdom, the Golan provides Israel with an ideal platform for its warning stations as well as the best available defense line against a massive Syrian ground attack. Challenging this belief, this article compares the present situation with an alternative defined by (a) a complete Israeli withdrawal from the Golan, (b) a complete demilitarization of the evacuated territory, and (c) considerable limitations on Syrian military presence in the area between the Golan and Damascus. The article reaches two conclusions. First, that a combination of means, primarily airborne and space‐based platforms, can effectively answer Israel's northern intelligence needs. Second, the security arrangements set above, combined with recent revolutionary military technologies and its relative advantage in this domain, offer Israel an effective ‐ in some respects even a better ‐ alternative, to the present defense line. 相似文献
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Mohini Rawool‐Sullivan Paul D. Moskowitz Ludmila N. Shelenkova 《The Nonproliferation Review》2013,20(1):161-171
When does a state become a “nuclear weapon state”? How we choose to answer this question has significant implications for proliferation assessment, analysis, and policy. Traditionally, the standard demarcation line has been a state's first nuclear test, but in recent years analysts have increasingly focused instead on the accumulation of a significant quantity (SQ) of fissile material. The article argues that although the test/no-test indicator clearly has problems, its replacement by the SQ/no-SQ indicator would be highly counterproductive. The article instead proposes supplementing the traditional test/no-test indicator with a theory-driven approach that focuses on the incentives and disincentives to test. 相似文献
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Pinar Derin‐Güre 《Defence and Peace Economics》2013,24(4):393-395
This paper investigates the economic roots of separatist terrorism in Turkey. The political conventional wisdom is that poverty in highly Kurdish‐populated, south‐eastern Turkey is one of the most important causes of separatist terrorism and Turkish–Kurdish conflict in Turkey. Therefore, many economic policies have been implemented to improve the economic conditions in the south‐eastern part of the country. Using the Global Terrorism Database and Vector Autoregression (VAR) methodology, I find that there is no causal relationship between economic conditions in south‐eastern Turkey and separatist terrorism. Therefore policy‐makers should be cautious in using economic measures to prevent separatist terrorism in Turkey. 相似文献