基于神经网络的柴油机特征参数评价与选择

在设备故障诊断中,正确地提取与选择特征参数对于诊断结果的有效性和准确性具有关键性的意义,在提出评价判据时样本的概率分布往往难以确定,针对模式识别中特征量的选择方法,结合人工神经网络原理,提出了利用人工神经网络进行故障特征量评价与选择的方法,实现了对柴油机特征参数的提取及选择,有效地解决了柴油机状态监测与故障诊断中测试参数多而难以优化的问题。     

Enhancing Political Cohesion in NATO during the 1950s or: How it Learned to Stop Worrying and Love the (Tactical) Bomb

This article argues that the perceived need by NATO to nurture political cohesion within the Alliance during the 1950s resulted in the adoption of strategic concepts that were out-of-step with the military environment in which it was operating. It maintains that the Alliance acquiesced to American leadership on nuclear issues which led to the development of tactical nuclear capabilities at the expense of conventional war-fighting capabilities for the defence of the European Central Front. This resulted in a strategic concept that enhanced political cohesion but was militarily unviable.     

Flexible capacity strategy in an asymmetric oligopoly market with competition and demand uncertainty

This article studies flexible capacity strategy (FCS) under oligopoly competition with uncertain demand. Each firm utilizes either the FCS or inflexible capacity strategy (IFCS). Flexible firms can postpone their productions until observing the actual demand, whereas inflexible firms cannot. We formulate a new asymmetrical oligopoly model for the problem, and obtain capacity and production decisions of the firms at Nash equilibrium. It is interesting to verify that cross‐group competition determines the capacity allocation between the two groups of firms, while intergroup competition determines the market share within each group. Moreover, we show that the two strategies coexist among firms only when cost differentiation is medium. Counterintuitively, flexible firms benefit from increasing production cost when the inflexible competition intensity is sufficiently high. This is because of retreat of inflexible firms, flexibility effect, and the corresponding high price. We identify conditions under which FCS is superior than IFCS. We also demonstrate that flexible firms benefit from increasing demand uncertainty. However, when demand variance is not very large, flexible firms may be disadvantaged. We further investigate the effects of cross‐group and intergroup competition on individual performance of the firms. We show that as flexible competition intensity increases, inflexible firms are mainly affected by the cross‐group competition first and then by the intergroup competition, whereas flexible firms are mainly affected by the intergroup competition. Finally, we examine endogenous flexibility and identify its three drivers: cost parameters, cross‐group competition, and intergroup competition. © 2017 Wiley Periodicals, Inc. Naval Research Logistics 64: 117–138, 2017     

Global strategic studies: a manifesto

This contribution reflects on the state of strategic studies today and the criticism it has received in recent years, as being outdated and irrelevant. The authors formulate some premises for reinvigorating this field of inquiry by widening its scope and research agenda to do more justice to the wide variety of actors, perspectives and practices observable in the enterprise of strategy in our contemporary globalised world.     

分布式计算环境下的栅格数据存储策略

针对传统的栅格数据存储策略不能满足分布式计算环境下粗粒度数据访问需求,应对海量栅格数据计算时效率低下的问题,结合分布式文件系统的存储特点,同时考虑地图代数算子在Map/Reduce阶段以栅格瓦片为单位的计算特点,提出一种基于Hadoop分布式文件系统的栅格瓦片存储策略。围绕栅格数据瓦片分割、压缩瓦片数据组织与存储、分布式文件输入输出接口改进等方面对该存储策略加以实现,并使用基于该存储策略的地图代数局部算子的分布式计算流程加以验证。理论分析与实验结果表明,该策略能够显著提高分布式计算环境下空间分析算子的运算速度。     

随队支援干扰目标选择辅助决策方法

随队支援干扰是现代空袭作战中重要的电子对抗手段,随队飞行过程中对干扰目标的选择是随队支援干扰飞机作战运用研究的重点和难点问题,详细分析了随队支援干扰飞机的作战阶段划分及主要作战行动,针对雷达网的探测距离和综合发现概率指标,建立了随队支援干扰下的计算模型,并主要尽可能地降低雷达网的综合发现概率,提出了基于动态规划的干扰目标选择辅助决策模型。最后,以某种作战背景为基础,进行了作战过程仿真和辅助决策结果分析,验证了该方法的可行性和有效性,该方法求得的结论也支持随队支援干扰飞机其他方面的作战运用研究。     

军民融合与技术创新

军民融合成为适应时代和平主旋律的一种新的国际趋势。随着现代科学技术的发展,技术创新有助于促进我国转变经济增长方式、有助于建设创新型国家、有助于增强我国的综合国力。军民融合与技术创新两者并不是相分离的,技术创新需要军民融合的不断深化提供资金、人才以及法律支持,同时军民融合促进技术创新模式选择。     

国防关键技术选择中备选技术清单研究

形成备选国防关键技术领域和技术清单是进行国防关键技术调查与选择的前提和基础。按照先分解再合并的研究路径,研究提出备选技术清单的有五个主要来源,通过初步开展国防关键技术领域和备选清单遴选的研究,为后续国防关键技术选择评价理论、模型、方法和工具的应用验证提供支撑。     

美军无人机集群项目发展

近几年来,无人机集群技术在美军多个方面的推动下,引起了全世界的热切关注。文章简要总结了美军无人机集群发展现状,梳理了美军开展无人机集群技术的初衷,并分析认为美军数量型无人机集群发展战略不完全适用于现阶段我军军情。文中给出了我国现阶段发展无人机集群的思路,这对全面认识无人机集群的优势、明晰我军无人机集群技术发展方向具有一定的参考价值。     

增强军校本科学员指挥谋略能力研究——基于计算机兵棋系统

对指挥谋略进行概念分析,确定基于计算机兵棋系统的指挥谋略训练内容;明确计算机兵棋推演的一般步骤和注意事项;以联军2004年11月"破晓"行动为例运用计算机兵棋系统进行指挥谋略训练。研究表明,基于计算机兵棋系统运用战例研究可以成为增强军校本科学员指挥谋略的训练模式。