全文获取类型
收费全文 | 454篇 |
免费 | 5篇 |
专业分类
459篇 |
出版年
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 4篇 |
2017年 | 10篇 |
2016年 | 10篇 |
2015年 | 8篇 |
2014年 | 8篇 |
2013年 | 59篇 |
2012年 | 22篇 |
2011年 | 26篇 |
2010年 | 21篇 |
2009年 | 14篇 |
2008年 | 27篇 |
2007年 | 13篇 |
2006年 | 15篇 |
2005年 | 5篇 |
2004年 | 3篇 |
2002年 | 3篇 |
2001年 | 3篇 |
1999年 | 2篇 |
1998年 | 6篇 |
1997年 | 6篇 |
1995年 | 5篇 |
1994年 | 4篇 |
1993年 | 10篇 |
1992年 | 7篇 |
1991年 | 6篇 |
1990年 | 2篇 |
1989年 | 12篇 |
1988年 | 3篇 |
1987年 | 10篇 |
1986年 | 10篇 |
1985年 | 7篇 |
1983年 | 5篇 |
1982年 | 5篇 |
1981年 | 8篇 |
1980年 | 9篇 |
1979年 | 11篇 |
1978年 | 4篇 |
1977年 | 6篇 |
1976年 | 7篇 |
1975年 | 7篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1972年 | 12篇 |
1971年 | 3篇 |
1970年 | 3篇 |
1969年 | 9篇 |
1968年 | 7篇 |
1966年 | 3篇 |
排序方式: 共有459条查询结果,搜索用时 15 毫秒
261.
Efficient computation of tight bounds is of primary concern in any branch-and-bound procedure for solving integer programming problems. Many successful branch-and-bound approaches use the linear programming relaxation for bounding purposes. Significant interest has been reported in Lagrangian and surrogate duals as alternative sources of bounds. The existence of efficient techniques such as subgradient search for solving Lagrangian duals has led to some very successful applications of Lagrangian duality in solving specially structured problems. While surrogate duals have been theoretically shown to provide stronger bounds, the difficulty of surrogate dual-multiplier search has discouraged their employment in solving integer programs. Based on the development of a new relationship between surrogate and Lagrangian duality, we suggest a new strategy for computing surrogate dual values. The proposed approach allows us to directly use established Lagrangian search methods for exploring surrogate dual multipliers. Computational experience with randomly generated capital budgeting problems validates the economic feasibility of the proposed ideas. 相似文献
262.
In this article we study the properties of the optimal Bayesian single-sampling plans when the prior distribution of the lot fraction defective is modified Beta, which has been found useful in the analysis of inspection schemes for complex production systems. These properties are used to devise an improved and more efficient algorithm for the determination of the optimal sampling plans. Numerical examples are presented to illustrate the potential computational savings of the algorithm. 相似文献
263.
264.
265.
Kimbra L. Fishel 《Low Intensity Conflict & Law Enforcement》2002,11(2):285-298
This chapter examines how Al Qaeda, an asymmetric power, was able to become a global challenger to the existing international structure. Neither regional insurgency theories nor grand-scale global theories alone are adequate to explain Al Qaeda's ability. Rather, a modification of the seven dimensions of the Manwaring paradigm for successful insurgency combined with key concepts of global revolutionary or imperial powers formerly applied to states gives insight to this fundamental question. Al Qaeda's asymmetric global challenge is unique, and understanding the nature of the threat is key to finally defeating it. 相似文献
266.
267.
268.
269.
270.
In some industries such as automotive, production costs are largely fixed and therefore maximizing revenue is the main objective. Manufacturers use promotions directed to the end customers and/or retailers in their distribution channels to increase sales and market share. We study a game theoretical model to examine the impact of “retailer incentive” and “customer rebate” promotions on the manufacturer's pricing and the retailer's ordering/sales decisions. The main tradeoff is that customer rebates are given to every customer, while the use of retailer incentives is controlled by the retailer. We consider several models with different demand characteristics and information asymmetry between the manufacturer and a price discriminating retailer, and we determine which promotion would benefit the manufacturer under which market conditions. When demand is deterministic, we find that retailer incentives increase the manufacturer's profits (and sales) while customer rebates do not unless they lead to market expansion. When the uncertainty in demand (“market potential”) is high, a customer rebate can be more profitable than the retailer incentive for the manufacturer. With numerical examples, we provide additional insights on the profit gains by the right choice of promotion.© 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2010 相似文献