全文获取类型
收费全文 | 223篇 |
免费 | 72篇 |
国内免费 | 22篇 |
出版年
2024年 | 2篇 |
2023年 | 2篇 |
2022年 | 4篇 |
2020年 | 5篇 |
2019年 | 7篇 |
2018年 | 4篇 |
2017年 | 11篇 |
2016年 | 16篇 |
2015年 | 13篇 |
2014年 | 13篇 |
2013年 | 12篇 |
2012年 | 16篇 |
2011年 | 20篇 |
2010年 | 12篇 |
2009年 | 24篇 |
2008年 | 17篇 |
2007年 | 12篇 |
2006年 | 20篇 |
2005年 | 11篇 |
2004年 | 21篇 |
2003年 | 9篇 |
2002年 | 7篇 |
2001年 | 10篇 |
2000年 | 6篇 |
1999年 | 8篇 |
1998年 | 7篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1975年 | 1篇 |
排序方式: 共有317条查询结果,搜索用时 31 毫秒
171.
172.
复杂性科学是当今世界科学发展的热点和前沿,其研究与应用正迅速向各个学科渗透和扩展,成为备受众多领域科学家关注的交叉学科研究领域.目前,在军事科学领域,战争复杂性的问题正日益受到学者们的广泛关注.应用复杂系统建模与仿真方法对战争复杂性问题进行建模与仿真研究是一种有别于传统的基于兰切斯特方程等数学模型方法研究战争问题的一种新方法.讨论了战争系统复杂性问题,在掌握现有资料的基础上,力图较全面介绍国内外关于基于Agent战争系统复杂性建模与仿真方面的最新研究进展,并对相关的研究成果给出了自己的看法. 相似文献
173.
In this paper, we consider a situation in which a group of facilities must be constructed in order to serve a given set of customers, where the facilities might not be able to guarantee an absolute coverage to the different customers. We examine the problem of maximizing the total service reliability of the system subject to a budgetary constraint. We propose a new reformulation of this problem that facilitates the generation of tight lower and upper bounds. These bounding mechanisms are embedded within the framework of a branch‐and‐bound procedure. Computational results on problem instances ranging in size up to 100 facilities and 200 customers reveal the efficacy of the proposed exact and heuristic approaches. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2006 相似文献
174.
针对杂波环境中的目标检测跟踪问题,提出一种基于随机有限集理论的多传感器目标联合检测跟踪算法。算法将目标状态和量测描述为随机集合,建立考虑目标出现、目标保持、目标消失等情况的目标状态随机有限集模型,以及考虑漏检和虚警的多传感器量测随机有限集模型。将目标的联合检测跟踪问题构建为目标状态集合的贝叶斯最优估计问题,并基于随机有限集理论对该贝叶斯估计算法的递推表达式进行严格理论推导。采用序贯蒙特卡罗技术实现算法的递推滤波。仿真结果验证了该算法的有效性以及算法相对于传统基于数据关联算法的性能优势。 相似文献
175.
建立了考虑涡轮入口和出口容积效应的涡轮动力学模型 ,利用该模型计算了燃气涡轮气瓶启动的动态响应过程 ,分析了影响涡轮动态特性的主要因素。计算结果表明 :涡轮前容积对涡轮入口压力和出口背压的过渡过程均有显著的影响 ,涡轮后容积对涡轮入口压力的过渡过程影响不大 ,对涡轮出口背压的影响显著。 相似文献
176.
张士峰 《国防科技大学学报》2000,22(3):84-89
当应力、强度分别服从于正态分布、指数分布和Weibull分布时 ,分析了应力 -强度模型的可靠性评估 ,着重讨论了无信息验前下的Bayes可靠性评估。仿真结果表明 ,无信息验前下的评估结论可以很好地用频率学派的观点来解释。 相似文献
177.
Non‐zero‐sum nonlinear network path interdiction with an application to inspection in terror networks 下载免费PDF全文
Noam Goldberg 《海军后勤学研究》2017,64(2):139-153
A simultaneous non‐zero‐sum game is modeled to extend the classical network interdiction problem. In this model, an interdictor (e.g., an enforcement agent) decides how much of an inspection resource to spend along each arc in the network to capture a smuggler. The smuggler (randomly) selects a commodity to smuggle—a source and destination pair of nodes, and also a corresponding path for traveling between the given pair of nodes. This model is motivated by a terrorist organization that can mobilize its human, financial, or weapon resources to carry out an attack at one of several potential target destinations. The probability of evading each of the network arcs nonlinearly decreases in the amount of resource that the interdictor spends on its inspection. We show that under reasonable assumptions with respect to the evasion probability functions, (approximate) Nash equilibria of this game can be determined in polynomial time; depending on whether the evasion functions are exponential or general logarithmically‐convex functions, exact Nash equilibria or approximate Nash equilibria, respectively, are computed. © 2017 Wiley Periodicals, Inc. Naval Research Logistics 64: 139–153, 2017 相似文献
178.
The economic growth effects of military expenditure have been the subject of a large literature in defence economics. Theories on the economic impacts of military expenditure greatly differ and include arguments that they either enhance economic growth or crowd out productive investments. Empirical literature on defence expenditure and economic growth nexus generally employs linear specifications to investigate the impact of defence expenditures on economic growth. Although it is now well established that many economic variables may have a non-linear data-generating mechanism, it seems that this reality has long been neglected in empirical work on defence–growth nexus. This paper attempts to fill this gap by employing non-linear panel data models to examine the effects of military expenditures on economic growth for Middle Eastern countries and Turkey, for the time period 1988–2012. Results show that the effect of military expenditure on economic growth is nonlinear such that the state of the economy actually determines the effect of the former on the latter. This is important not only in showing asymmetric relationship between these variables but also in revealing the reasons of mixed results of earlier literature. 相似文献
179.
大型电子装备层次诊断应用研究 总被引:2,自引:1,他引:1
根据电子装备诊断的特点,探讨了利用层次性理论对电子装备进行故障诊断的必要性和可行性,给出了层次性诊断中层间诊断和层内诊断的概念、原理及实现方法。首次将可列集的概念引用到层次诊断中,并给出了层次诊断中故障模式空间的选取原则,为层次诊断的工程实现和未来进行多信息诊断提供了基本框架。 相似文献
180.