基于模糊信息论的空中目标识别模型研究

空中目标识别是防空作战辅助决策的关键环节之一。针对目标识别中不确定信息,建立基于模糊信息论的空中目标识别模型。该模型利用模糊信息论中的模糊数,基于贴近度的模糊模式识别对待识空中目标进行初步识别,同时为解决不确定信息本身对目标识别结果稳定性的影响,采用模糊信息熵对目标识别结果修正,从而进一步提高了空中目标识别结果的稳定性和可信度。     

Network routing for insurgency: An adversarial risk analysis framework

Problems in counterterrorism and corporate competition have prompted research that attempts to combine statistical risk analysis with game theory in ways that support practical decision making. This article applies these methods of adversarial risk analysis to the problem of selecting a route through a network in which an opponent chooses vertices for ambush. The motivating application is convoy routing across a road network when there may be improvised explosive devices and imperfect intelligence about their locations. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011     

由哲学观念到文学内涵的衍化——论明清诗话对孟子“养气说”的接受

孟子的＂养气说＂虽然最初只是传达一种哲学观念,但是后世的文论家却不断发展孟子的这一学说,逐步赋予其文学性内涵。而这一趋势在明清诗话中发展到极致。明清诗论家不仅开始用＂气＂对林林总总的诗歌进行分类、品评,并且也把孟子＂养气＂的观点带入到明清诗话中,用于探讨不同诗作风格的形成根源。     

高校思想政治理论课实践教学的多元建构路径

高校思想政治理论课实践教学,是实效性改革的重要举措。思想政治理论课教学与实践教学是两个相互补充的方面,缺一不可。实践教学作为理论教学的一个重要环节,应当是而且可以是多元模式的。     

最优化方法在摄像机标定中的应用

研究了最优化理论与方法在摄像机标定中的应用,并以两步法的第二步为例,详细介绍了如何根据最小化重投影误差这一非线性最小二乘问题求出所有标定参数的最优解,给出了用Guses-Newton法进行求解的具体步骤,并在Matlab下实现对一组初始数据的迭代优化.     

Capacity allocation with traditional and Internet channels

In this paper we study a capacity allocation problem for two firms, each of which has a local store and an online store. Customers may shift among the stores upon encountering a stockout. One question facing each firm is how to allocate its finite capacity (i.e., inventory) between its local and online stores. One firm's allocation affects the decision of the rival, thereby creating a strategic interaction. We consider two scenarios of a single‐product single‐period model and derive corresponding existence and stability conditions for a Nash equilibrium. We then conduct sensitivity analysis of the equilibrium solution with respect to price and cost parameters. We also prove the existence of a Nash equilibrium for a generalized model in which each firm has multiple local stores and a single online store. Finally, we extend the results to a multi‐period model in which each firm decides its total capacity and allocates this capacity between its local and online stores. A myopic solution is derived and shown to be a Nash equilibrium solution of a corresponding “sequential game.” © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

Place–time correlation of robbery incidents in metropolitan Lagos: a Mantel index analysis

This article investigates the correlation of space and time in the clustering of robbery incidents in metropolitan Lagos. Analysis was carried out on 781 selected robbery incidents in 2013. Using the Mantel index to correlate place and time intervals for pairs of robbery incidents, the results show that robberies are respectively concentrated in residential areas, transport nodes and public places, peaking at midnight during weekdays. The results further show that this concentration is most likely greater than what would be expected on the basis of a chance distribution. The study concludes that various factors may exist which cause clusters of robberies to occur in these places at these times.     

基于经典控制理论的制导系统校正方法研究

针对空空导弹抗目标大机动时,制导系统持续增加的快速性需求,利用反馈/前馈控制信号可提高瞬态和频率响应的经典控制思想,以及在制导算法中引入导弹的实际加速度补偿量以改善制导回路性能的方法,设计了制导系统校正算法.然后,通过线性化模型对制导系统校正算法的性能进行了数字仿真,仿真结果表明系统校正算法能够降低目标机动时所产生的脱...     

碳纳米管增强复合材料Timoshenko梁弯曲和屈曲行为分析

考虑碳纳米管(carbon nanotubes,CNTs)的尺度效应,研究宏观尺度下碳纳米管增强复合材料(carbon nanotubes reinforced composites,CNTRCs)梁的弯曲和屈曲行为。在EMT(Eshelby-Mori-Tanaka)方法的基础上,利用非局部理论提出了可表征CNTs尺度效应的非局部EMT本构模型。根据Timoshenko梁理论,采用哈密顿原理得到CNTRCs梁的静力学微分方程和边界条件。求解简支边界条件下CNTRCs梁的弯曲响应和极限屈曲载荷,并与文献进行对比验证所建模型和求解方法的正确性。分析了CNTs的尺度效应参数和体积分数以及复合材料梁的长细比等因素对简支CNTRCs梁弯曲响应和极限屈曲载荷的影响规律。结果表明,考虑CNTs的尺度效应会削弱结构等效刚度,且CNTs体积分数和尺度效应参数对大长细比CNTRCs梁的弯曲响应和极限屈曲载荷的影响幅度较大。     

改进博弈论的舰载无人机编队协同对海突击目标分配

目标分配问题是UAV自主控制的重要问题。针对舰载无人机编队协同对海突击目标分配问题,首先建立了基于离散动态贝叶斯网络的目标价值评估模型,在此基础上构建了舰载无人机编队的益损值矩阵,设计了舰载无人机编队协同对海突击目标分配的决策函数,提出了一种基于改进博弈论的目标分配方法,为4种不同约束条件下的目标分配问题分别设计了算法。最后对所建立的目标价值评估模型和改进博弈论的目标分配算法进行了实例仿真,仿真结果表明了模型和算法的可行性和有效性。