全文获取类型
| 收费全文 | 603篇 |
| 免费 | 0篇 |
专业分类
| 603篇 |
出版年
| 2019年 | 12篇 |
| 2017年 | 17篇 |
| 2016年 | 10篇 |
| 2015年 | 14篇 |
| 2014年 | 16篇 |
| 2013年 | 127篇 |
| 2012年 | 5篇 |
| 2011年 | 5篇 |
| 2010年 | 8篇 |
| 2009年 | 11篇 |
| 2007年 | 6篇 |
| 2006年 | 8篇 |
| 2005年 | 9篇 |
| 2004年 | 11篇 |
| 2003年 | 5篇 |
| 2002年 | 10篇 |
| 2001年 | 4篇 |
| 2000年 | 8篇 |
| 1999年 | 6篇 |
| 1998年 | 13篇 |
| 1997年 | 6篇 |
| 1996年 | 8篇 |
| 1995年 | 5篇 |
| 1994年 | 15篇 |
| 1993年 | 14篇 |
| 1992年 | 8篇 |
| 1991年 | 14篇 |
| 1990年 | 9篇 |
| 1989年 | 14篇 |
| 1988年 | 15篇 |
| 1987年 | 16篇 |
| 1986年 | 16篇 |
| 1985年 | 13篇 |
| 1984年 | 8篇 |
| 1983年 | 7篇 |
| 1982年 | 7篇 |
| 1981年 | 8篇 |
| 1980年 | 5篇 |
| 1979年 | 8篇 |
| 1978年 | 12篇 |
| 1976年 | 7篇 |
| 1975年 | 6篇 |
| 1974年 | 8篇 |
| 1973年 | 7篇 |
| 1972年 | 9篇 |
| 1971年 | 4篇 |
| 1970年 | 9篇 |
| 1969年 | 6篇 |
| 1968年 | 4篇 |
| 1967年 | 6篇 |
排序方式： 共有603条查询结果，搜索用时 15 毫秒
111.
112.
Tobias Brueggemann Johann L. Hurink Tjark Vredeveld Gerhard J. Woeginger 《海军后勤学研究》2011,58(8):795-803
We investigate the quality of local search heuristics for the scheduling problem of minimizing the makespan on identical parallel machines. We study exponential size neighborhoods (whose size grows exponentially with the input length) that can be searched in polynomial time, and we derive worst‐case approximation guarantees for the local optima of such neighborhoods. The so‐called split neighborhood splits a feasible schedule into two layers, and then recombines the two layers by finding a perfect matching. We show that the makespan of every local optimum for split is at most a factor of 2 away from the globally optimal makespan. We then combine the split neighborhood with two neighborhoods from the literature. The combination of split with the jump neighborhood only marginally improves the approximation guarantee, whereas the combination with the lexicographic‐jump neighborhood decreases the approximation guarantee from 2 to 3/2. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011 相似文献
113.
An important aspect of supply chain management is dealing with demand and supply uncertainty. The uncertainty of future supply can be reduced if a company is able to obtain advance capacity information (ACI) about future supply/production capacity availability from its supplier. We address a periodic‐review inventory system under stochastic demand and stochastic limited supply, for which ACI is available. We show that the optimal ordering policy is a state‐dependent base‐stock policy characterized by a base‐stock level that is a function of ACI. We establish a link with inventory models that use advance demand information (ADI) by developing a capacitated inventory system with ADI, and we show that equivalence can only be set under a very specific and restrictive assumption, implying that ADI insights will not necessarily hold in the ACI environment. Our numerical results reveal several managerial insights. In particular, we show that ACI is most beneficial when there is sufficient flexibility to react to anticipated demand and supply capacity mismatches. Further, most of the benefits can be achieved with only limited future visibility. We also show that the system parameters affecting the value of ACI interact in a complex way and therefore need to be considered in an integrated manner. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011 相似文献
114.
Doctor David J. Kilcullen 《战略研究杂志》2013,36(4):597-617
This article suggests that the War on Terrorism is actually a campaign against a globalized Islamist 1 insurgency. Therefore, counterinsurgency approaches are more relevant to the present conflict than traditional terrorism theory. Indeed, a counterinsurgency approach would generate subtly, but substantially different, policy choices in prosecuting the war against Al Qaeda. Based on this analysis, the article proposes a strategy of ‘disaggregation’ that seeks to dismantle, or break, the links in the global jihad.2 Like containment in the Cold War, disaggregation would provide a unifying strategic conception for the war – a conception that has been somewhat lacking to date. 相似文献
115.
In a rendezvous search problem, two players are placed in a network and must try to meet each other in the least possible expected time. We look at rendezvous search on a discrete interval in which the players are initially placed using independent draws (usually assumed to be from the same distribution). Some optimal solutions are known if this distribution is uniform, and also for certain other special types of distribution. In this article, we present two new results. First, we characterize the complete set of solutions for the uniform case, showing that all optimal strategies must have two specific properties (namely, of being swept and strictly geodesic). Second, we relate search strategies on the interval to proper binary trees, and use this correspondence to derive a recurrence relation for solutions to the symmetric rendezvous problem for any initial distribution. This relation allows us to solve any such problem computationally by dynamic programming. Finally, some ideas for future research are discussed. © Wiley Periodicals, Inc. Naval Research Logistics 60: 454–467, 2013 相似文献
116.
Ronald J Kurth Former President of the U.S. Naval War College 《战略研究杂志》2013,36(2):261-280
This article is a portrait of Admiral Sergei Gorshkov, commander of the Soviet Navy for almost three decades, from 1956–85. The author, a retired US Navy admiral with a Harvard PhD in Russian studies who served as both defense and naval attaché in Moscow, draws on numerous face-to-face interactions with Gorshkov. He also explores Gorshkov's memoirs that were published recently in Russia but have not appeared in an English translation. The paper is not only a first-hand account of an important historical figure, but also a window into the world of military-to-military diplomacy and intelligence during the Cold War. 相似文献
117.
Andrew J. Dowdle 《Small Wars & Insurgencies》2013,24(2):161-174
Previous research on African military spending suggests the existence of civil strife as the best predictor of high levels of military spending. However, little is known about why some African nations maintain strong ‘auxiliary’ or paramilitary organizations while others do not. This study finds that the presence of civil or interstate war does not strengthen reserve or irregular forces. Civilian governments promote strong paramilitary organizations to counter any threat the regular military might pose to regime survivability as a form of clientelist politics. 相似文献
118.
Matthew J. Thomas 《Small Wars & Insurgencies》2013,24(3):413-435
On 9 February 2012 the Somali terrorist organization al-Shabaab officially merged with al-Qaeda. While the significance of the merger is highly contested, it does expose internal weaknesses within the two organizations along ideological, clan, and sectarian lines. The article identifies three key weaknesses of the merger and concludes with a discussion of al-Qaeda's growing presence in trans-Saharan Africa. 相似文献
119.
Franz J. Gayl 《Defence and Peace Economics》2013,24(5):465-484
This comment addresses the Rohlfs–Sullivan analysis titled: ‘The Cost-Effectiveness of Armored Tactical Wheeled Vehicles [TWVs] for Overseas US Army Operations.’ The analysis evaluated policies to replace Type 1 and 2 TWVs with Type 3s. There is no evidence the analysis factored in fatality causes, fatality relationships to vehicles, or compared survivability of vehicles. Furthermore, it did not note when Type 3 TWVs were requested, when they impacted fatalities, or TWV use policies. It also assumed Type 3 TWVs prompted negative unit behaviors while discounting evidence of positive behaviors. In summary, the analysis is incomplete and should be revised. 相似文献
120.
J. M. Quinn 《Defence and Peace Economics》2013,24(5):536-554
This study models the structural sources of variation in the use of selective (discriminate) repression within 89 civil wars fought between 1981 and 2005. The severity of repressive violence is modeled as a function of the amount of territory being contested by the insurgents. This idea is operationalized using measures of the location, size, and density of insurgency violence. The analysis finds evidence that the repressive behavior of both governments and rebel groups is linked to conflict geography. Governments violate physical integrity rights more frequently and kill more civilians the greater the overall amount of territory under contestation. Rebels kill more civilians in highly dispersed insurgencies that lack a clear epicenter. 相似文献