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61.
Anna Antczak-Barzan 《Defense & Security Analysis》2015,31(3):228-245
This article examines Poland's national potential and its international position within the European Union (EU) with respect to security issues. It presents research results based on a comparison of Poland's national potential as it relates to other EU countries, which is useful when evaluating Poland's power within the EU. The article also evaluates Poland's crisis potential, i.e. it identifies those factors that may potentially be treated as threats to national and regional security. Finally, it enables the identification of challenges to Poland's security in the second decade of the twenty-first century. The research is conducted according to a multidimensional comparative analysis, which is perceived by the author as the best available to measure a country's power despite its weaknesses. 相似文献
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We study the assortment optimization problem with position effects under the nested logit model, whose goal is to find the revenue-maximizing subset of products as well as their corresponding display positions. In this joint assortment-position optimization problem, the choices of products are affected by not only their qualities and prices but also the positions where they are displayed. Despite determining the assortment and their corresponding display positions sequentially, we propose to solve this problem in an integrated way to obtain the optimal solution. We formulate this problem as a nonlinear binary integer programming model and develop a dynamic programming based solution approach to obtain the optimal assortment-position assignments. We carry out extensive numerical experiments to evaluate the benefit of our integrated approach. The most important insight we discover is that it is not necessarily better to put the most attractive products in the best position. Moreover, we show that compared to the sequential approaches, our approach can improve revenue by 10.38% on average, which suggests that firms should take into consideration position effects when making assortment decisions. Finally, we discuss results related to two extensions of this problem, that is, the special case when positions are preassigned to nests, and the joint assortment-position-price optimization problem. 相似文献
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弹道导弹主动段自旋可以对抗激光武器拦截,实现主动段突防.但是主动段自旋又会引起较大的速度位置偏差,进而造成较大的落点偏差.提出了一种通过自由段组合制导修正落点偏差的方案.首先建立了主动段自旋弹道模型,分析了主动段自旋引起的速度位置误差及最终的落点偏差,然后在自由段采用INS/GPS组合制导,应用卡尔曼滤波对数据进行处理.仿真表明,该方法可以明显提高导弹的命中精度. 相似文献
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运用复杂网络理论,将军事力量部署进行网络拓扑化,通过分析计算网络关键节点的组成来研究军事力量在空间部署的合理性。在定义了军事力量部署网络拓扑化后的关键节点概念的基础上,提出了基于网络节点度和介数综合数学模型来评价网络节点关键度量值数学模型及基本算法流程,并运用案例进行了计算分析。 相似文献
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针对目前非自备式舰炮武器系统目标引导的需求问题,设计了一种新的试验方法,该方法通过在现有的测控设备硬件平台上增加同步串口卡和通讯传输转换介质,并经过一定量的坐标数据变换处理,从而实现了GPS定位数据到舰炮武器系统目指数据的软、硬件转换。该方法在某型号武器系统试验中得到了充分认证,为后续试验中类似情况提供了技术参考。 相似文献
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基于证据理论的常规导弹阵地生存防护研究 总被引:3,自引:1,他引:2
着眼于阵地生存防护对策分析中的不确定性,提出了一种基于证据理论判别来袭武器类型的方法,通过对武器威胁度的评估,建立了来袭武器威胁等级判据,构建了详细的生存对策,可为常规导弹阵地生存防护决策提供有效的辅助支持. 相似文献