全文获取类型
收费全文 | 783篇 |
免费 | 21篇 |
国内免费 | 1篇 |
出版年
2021年 | 6篇 |
2019年 | 20篇 |
2018年 | 10篇 |
2017年 | 20篇 |
2016年 | 14篇 |
2015年 | 14篇 |
2014年 | 21篇 |
2013年 | 150篇 |
2012年 | 8篇 |
2011年 | 6篇 |
2010年 | 13篇 |
2009年 | 11篇 |
2007年 | 11篇 |
2006年 | 10篇 |
2005年 | 14篇 |
2004年 | 14篇 |
2003年 | 6篇 |
2002年 | 15篇 |
2000年 | 8篇 |
1999年 | 10篇 |
1998年 | 17篇 |
1997年 | 13篇 |
1996年 | 11篇 |
1995年 | 6篇 |
1994年 | 21篇 |
1993年 | 22篇 |
1992年 | 13篇 |
1991年 | 20篇 |
1990年 | 13篇 |
1989年 | 18篇 |
1988年 | 20篇 |
1987年 | 18篇 |
1986年 | 20篇 |
1985年 | 18篇 |
1984年 | 9篇 |
1983年 | 9篇 |
1982年 | 12篇 |
1981年 | 12篇 |
1980年 | 7篇 |
1979年 | 12篇 |
1978年 | 15篇 |
1976年 | 9篇 |
1975年 | 8篇 |
1974年 | 11篇 |
1973年 | 11篇 |
1972年 | 12篇 |
1970年 | 9篇 |
1969年 | 8篇 |
1968年 | 7篇 |
1967年 | 8篇 |
排序方式: 共有805条查询结果,搜索用时 31 毫秒
71.
Peter J. Phillips 《Defense & Security Analysis》2010,26(3):261-272
The purpose of this article is to explore the economic theoretical foundations of the idea that rational terrorist organizations deliberately randomize their attacks (by type, timing, location, and targets) to generate uncertainty and intimidation. A choice theoretic framework is applied to the analysis of the terrorist organization's behavior to determine whether welfare (utility) gains from the randomization of terrorist attacks are plausible and feasible. The randomization of attacks can appear to promise higher amounts of political influence for each resource input but it turns out that randomization cannot manufacture a situation where higher amounts of political influence are obtained for each resource input.The results imply that, rather than randomization and instability, the rational terrorist organization is more likely to prefer stability. The findings and implications provide a theoretical explanation for the non-randomness of terrorist attacks.Thismay be one small step towards explaining the patterns – non-randomness – in the time-series of terrorist incidents. 相似文献
72.
The general problem we are concerned with here is the estimation of Pθ(C) where C is some fixed event and Pθ is unknown in some class. The various available estimation procedures seem to involve the choice of some random probability measure. In particular we consider this problem when C is a disk in R2 centered at o and Pθ is restricted to be bivariate normal. Details concerning the implementation of the estimation procedures and a Monte Carlo study are discussed for this case. This particular problem arises when we are concerned with assessing the accuracy of a targeting procedure. 相似文献
73.
The problem is to protect a set of t targets by n perfect interceptors against an attack by m perfect weapons. If the defender solves for an optimal preallocated preferential defense and associated game value assuming m1 attackers, and the attacker knows the assumption of the defender and utilizes m2 attackers, he may be able to achieve significantly more damage than had the defender assumed that there would be m2 attackers. The article treats the robustness of preallocated preferential defense to assumptions about the size of the attack and presents results of an alternative approach. 相似文献
74.
Variations of Hale's channel assignment problem, the L(j, k)‐labeling problem and the radio labeling problem require the assignment of integers to the vertices of a graph G subject to various distance constraints. The λj,k‐number of G and the radio number of G are respectively the minimum span among all L(j, k)‐labelings, and the minimum span plus 1 of all radio labelings of G (defined in the Introduction). In this paper, we establish the λj,k‐number of ∏ K for pairwise relatively prime integers t1 < t2 < … < tq, t1 ≥ 2. We also show the existence of an infinite class of graphs G with radio number |V(G)| for any diameter d(G). © 2003 Wiley Periodicals, Inc. Naval Research Logistics, 2005 相似文献
75.
In this article, we discuss the optimal allocation problem in a multiple stress levels life‐testing experiment when an extreme value regression model is used for statistical analysis. We derive the maximum likelihood estimators, the Fisher information, and the asymptotic variance–covariance matrix of the maximum likelihood estimators. Three optimality criteria are defined and the optimal allocation of units for two‐ and k‐stress level situations are determined. We demonstrate the efficiency of the optimal allocation of units in a multiple stress levels life‐testing experiment by using real experimental situations discussed earlier by McCool and Nelson and Meeker. Monte Carlo simulations are used to show that the optimality results hold for small sample sizes as well. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2007 相似文献
76.
77.
78.
79.
The paper explores terrorist choice by applying two well-known theoretical frameworks: stochastic dominance and prospect theory (PT). We analyse each pair of attack methods that can be formed from the RAND-MIPT database and the Global Terrorism Database. Instances of stochastic dominance are identified. PT orderings are computed. Attention is accorded to the identification of ‘trigger points’ and the circumstances that may lead to an increased likelihood that a terrorist will select an attack method associated with a higher expected number of fatalities, i.e. a potentially more damaging attack method. 相似文献
80.
This paper examines the impact of military expenditure on economic growth on a large balanced panel, using an exogenous growth model and dynamic panel data methods for 106 countries over the period 1988–2010. A major focus of the paper is to consider the possibility group heterogeneity and non-linearity. Having estimated the model for all of the countries in the panel and finding that military burden has a negative effect on growth in the short and long run, the panel is broken down into various groupings based upon a range of potentially relevant factors, and the robustness of the results is evaluated. The factors considered are different levels of income, conflict experience, natural resources abundance, openness and aid. The estimates for the different groups are remarkably consistent with those for the whole panel, providing strong support for the argument that military spending has adverse effects on growth. There are, however, some intriguing results that suggest that for certain types of countries military spending has no significant effect on growth. 相似文献