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261.
This study introduces one modeling methodology that describes a broad range of multiple stage production planning issues, including multiple limited resources with setup times and joint fixed cost relationships. An existing production system is modeled in this fashion, creating a new set of 1350 highly generalized benchmark problems. A computational study is conducted with the 1350 benchmark problems introduced in this paper and 2100 benchmark problems, with more restrictive assumptions, from the existing literature. The relative merits of a decomposition‐based algorithm and a neighborhood search technique known as NIPPA, or the Non‐sequential Incremental Part Period Algorithm, are assessed. NIPPA is generally the more successful of the two techniques, although there are specific instances in which the decomposition‐based algorithm displayed a distinct advantage. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005 相似文献
262.
We present a stochastic programming approach to capacity planning under demand uncertainty in semiconductor manufacturing. Given multiple demand scenarios together with associated probabilities, our aim is to identify a set of tools that is a good compromise for all these scenarios. More precisely, we formulate a mixed‐integer program in which expected value of the unmet demand is minimized subject to capacity and budget constraints. This is a difficult two‐stage stochastic mixed‐integer program which cannot be solved to optimality in a reasonable amount of time. We instead propose a heuristic that can produce near‐optimal solutions. Our heuristic strengthens the linear programming relaxation of the formulation with cutting planes and performs limited enumeration. Analyses of the results in some real‐life situations are also presented. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005. 相似文献
263.
建设一支听党指挥、能打胜仗、作风优良的人民军队,是党在新形势下的强军目标。听党指挥是灵魂,决定军队建设的政治方向。铸牢听党指挥这个强军之魂,夯实思想基础是根本,落实根本制度是保证,加强干部队伍建设是关键,弘扬优良作风是重点。 相似文献
264.
The North Atlantic Treaty Organization (NATO) has since the turn of the new century experienced a double transformation gap: between global and regionally oriented allies and between allies emulating new military practices defined by the United States and allies resisting radical change. This article takes stock of these gaps in light of a decade's worth of collective and national adjustments and in light of counter-insurgency lessons provided by Afghanistan. It argues first of all that the latter transatlantic gap is receding in importance because the United States has adjusted its transformation approach and because some European allies have significantly invested in technological, doctrinal, and organizational reform. The other transformation gap is deepening, however, pitching battle-hardened and expeditionary allies against allies focused on regional tasks of stabilization and deterrence. There is a definite potential for broad transformation, our survey of officers' opinion shows, but NATO's official approach to transformation, being broad and vague, provides neither political nor military guidance. If NATO is to move forward and bridge the gap, it must clarify the lessons of Afghanistan and embed them in its new Strategic Concept. 相似文献
265.
Zhang Yunzhuang 《战略研究杂志》2013,36(6):887-896
This article is a response to Evron's argument, offering readers another perspective to assess China's military modernization and war fighting capabilities, using the same framework and methodology. It examines three topics: China's national security and military strategy, the PLA's procurement decision-making process, and China's military support and mobilization system. It concludes that, China's military modernization is to fight and win local wars under the conditions of informatization, but if required the PLA can reliably supply large numbers of sophisticated weapons and spare parts, to wage a complex and prolonged conflict. 相似文献
266.
‘Mowing the Grass’, Israel’s strategy in the twenty-first century against hostile non-state groups, reflects the assumption that Israel finds itself in a protracted intractable conflict. The use of force in such a conflict is not intended to attain impossible political goals, but a strategy of attrition designed primarily to debilitate the enemy capabilities. Only after showing much restraint in its military responses does Israel act forcefully to destroy the capabilities of its foes, hoping that occasional large-scale operations also have a temporary deterrent effect in order to create periods of quiet along its borders. The Israeli approach is substantively different from the current Western strategic thinking on dealing with non-state military challenges. 相似文献
267.
Christian Tripodi 《战略研究杂志》2013,36(1):123-151
In light of present day calls for increased levels of cultural understanding on the part of Western forces engaged in conflict, this article assesses the utility of such knowledge in light of the British experience of the North-West Frontier of India 1901–1945. By using the British concept of the Political Officer as an example, it proposes that while cultural understanding is of genuine importance when operating in such a challenging environment, possession of it does not necessarily aid either the design or implementation of successful policy. As the British experience on the Frontier during this period illustrates, cultural awareness and understanding may be possessed in abundance, and the mechanisms for achieving such a state of understanding may be advanced, but traditional factors such as a cultural bias on the part of policy-makers, conservatism, underfunding, local resistance to unfamiliar concepts and a fractured civil-military relationship will dominate such awareness and overshadow the benefits that it may provide. 相似文献
268.
In this study, we illustrate a real‐time approximate dynamic programming (RTADP) method for solving multistage capacity decision problems in a stochastic manufacturing environment, by using an exemplary three‐stage manufacturing system with recycle. The system is a moderate size queuing network, which experiences stochastic variations in demand and product yield. The dynamic capacity decision problem is formulated as a Markov decision process (MDP). The proposed RTADP method starts with a set of heuristics and learns a superior quality solution by interacting with the stochastic system via simulation. The curse‐of‐dimensionality associated with DP methods is alleviated by the adoption of several notions including “evolving set of relevant states,” for which the value function table is built and updated, “adaptive action set” for keeping track of attractive action candidates, and “nonparametric k nearest neighbor averager” for value function approximation. The performance of the learned solution is evaluated against (1) an “ideal” solution derived using a mixed integer programming (MIP) formulation, which assumes full knowledge of future realized values of the stochastic variables (2) a myopic heuristic solution, and (3) a sample path based rolling horizon MIP solution. The policy learned through the RTADP method turned out to be superior to polices of 2 and 3. © 2010 Wiley Periodicals, Inc. Naval Research Logistics 2010 相似文献
269.
270.
王祁为 《中国人民武装警察部队学院学报》2011,(6):34-36
对高层住宅安全疏散的几种形式进行了比较,重点分析了剪刀楼梯对日常使用和疏散救援的影响。提出了改进意见,并试图探索一种疏散楼梯与临时避难平台相结合的疏散方式。 相似文献