舰载雷达目标发现概率的几种模拟计算模型分析

舰载雷达目标发现概率的模拟估算是舰船作战效能模拟评估的重要指标估算之一 .文中提出了舰载雷达目标发现概率的 5种模拟模型 ,并分析和比较了 5种模型的特点和适用范围     

磁探针位置及角度偏移对电磁发射过程测试的影响

简化电磁发射装置中的导轨和电枢为线电流下的直导体,建立发射装置的物理模型。利用毕奥-萨伐尔定律和感应电动势原理,推导出磁探针线圈中心放置点的磁感强度。假设线圈范围内的磁场为均匀磁场,计算得到磁探针线圈产生的电动势。以此设计测量所用的磁探针,并和测试数据对比验证模型的正确性。在多次试验中发现,发射过程中装置振动导致磁探针距离变化和角度偏转问题。测量并分析三组单次发射中的故障测试状态。仿真和实验数据表明:小范围距离变化没有使磁探针的测试性能失效,但角度偏移对下一步的速度拟合带来误差干扰,且随着角度增大拟合速度逐步减小。     

Holmes’ front: constructing a new face of battle for America’s Civil War

ABSTRACT

In his seminal study of the changing nature of warfare between Agincourt and the Somme, military historian John Keegan proposed that future historians might consider combatants’ emotions in their assessments of the impact and nature of conflict. Recent years have witnessed the emergence of the history of emotions as an analytical approach, but rarely, if ever, is this directed toward the study of military history, far less the history of insurgencies and counter-insurgencies. This paper examines America’s civil war (1861–1865) as a case study of the ways in which an emotional history approach might illuminate not the physical experiences of but rather the immediate and longer-term reactions to counter-insurgency conflict through a focus on one specific individual, the future Supreme Court Justice Oliver Wendell Holmes, Jr. It proposes that Holmes, whilst not a man of the ranks, nevertheless can reveal the wider ramifications of civil war and its emotional impact, both individually and culturally. As a relatively limited internecine war, one not fought by professional armies but by volunteer forces, America’s civil war highlights the ways in which the soldier’s response points us toward the kind of emotional revolution that has, to date, mainly been located within the European nations.     

针对不同视场辅助信标的无人机目标定位方法

针对无人机在单站测角测距的目标定位过程中受无人机姿态角误差影响较大的问题，提出一种对辅助信标进行探测并与惯性传感器相结合的无人机姿态求解方法。建立基于容积卡尔曼滤波的惯性传感器姿态求解模型，采用梯度下降法对基于辅助信标的无人机位姿参数进行求解，并综合它们的结果对无人机的姿态偏差进行估计和校正，最后完成了不同视场条件下的目标定位和仿真计算。结果表明，所提方法对无人机目标定位精度有明显提高。     

计算机病毒攻击条件下的信息网络效能度量

从网络中心战的内涵入手,分析了其内部逻辑结构,指出信息网络是网络中心战效能得以发挥的关键,将信息网络的效能模型与计算机病毒在网络中的传播模型相结合,建立了计算机病毒攻击条件下的信息网络效能度量模型.在蓝方进行计算机病毒攻击条件下,针对红方采取有效的反病毒措施和不能采取有效反病毒措施,进行了仿真模拟,并分析了对信息网络的效能所产生的影响,得出了有价值的结论.     

On gamma estimation via matrix kriging

In financial engineering, sensitivities of derivative prices (also known as the Greeks) are important quantities in risk management, and stochastic gradient estimation methods are used to estimate them given the market parameters. In practice, the surface (function) of the Greeks with respect to the underlying parameters is much more desired, because it can be used in real‐time risk management. In this paper, we consider derivatives with multiple underlying assets, and propose three stochastic kriging‐based methods, the element‐by‐element, the importance mapping, and the Cholesky decomposition, to fit the surface of the gamma matrix that can fulfill the time constraint and the precision requirement in real‐time risk management. Numerical experiments are provided to illustrate the effectiveness of the proposed methods.     

基于公平谓词法的JMS消息过滤改进算法

研究了JMS发布／订阅消息传递模式的工作机制，分析了JMS在对事件进行匹配时的过滤算法，针对该算法的不足提出了采用公平谓词法来改进JMS的消息过滤速度，改进方法对基于JMS的发布／订阅应用程序的开发具有一定的指导意义。     

IETM在新型火炮装备中的应用

针对现代武器装备发展趋势及维修保障要求,以Borland Delphi为平台,采用关系数据库技术,开发了新型火炮装备的IETM系统。该系统将各种格式图像信息统一整合,采用Cult3D技术实现三维模型的人机交互,提供了方便快捷的检索方式。     

美国陆军作战指挥系统

自海湾战争以来的局部战争,信息作战改变并主导了现代战场。描述了美陆军作战指挥系统及其支援系统、通信系统的组成、基本功能和发展前景。     

自适应变异遗传算法在通信网络时延和路由选择优化中的应用分析

在遗传算法中采用自适应的方法来控制变异操作,可以提高算法的全局搜索能力,加快收敛速度,从而可以迅速地求解组合优化问题,并在进一步求解计算机通信网优化问题中得到成功应用.