Defensive weapons and star wars: a supergame with optimal punishments

We model the perspective faced by nuclear powers involved in a supergame where nuclear deterrence is used to stabilise peace. This setting allows us to investigate the bearings of defensive weapons on the effectiveness of deterrence and peace stability, relying on one-shot optimal punishments. We find that the sustainability of peace is unaffected by defensive shields if the latter are symmetric across countries, while asymmetric endowments of such weapons have clear-cut destabilising consequences.     

发变电所传导干扰分析与抑制措施的研究

通过对发变电所由开关操作在二次系统和低压交流电源系统传导测量结果的分析，确定变电站低压交流电源中传导干扰的特征，利用安捷伦（Agilent）矢量网络分析仪，研究几种典型电源滤波器的插入损耗和特性阻抗等频率特性，应用夏弗纳（Schaffner）等系列抗扰度试验设备，研究电源滤波器对电快速瞬变脉冲群和衰减振荡波的滤波和抑制效果，给出了变电站电源滤波器的滤波特性要求。     

永磁无刷直流电机驱动器并联系统环流的抑制

驱动器并联方式能有效扩大驱动容量,但该方式容易引入环流。为了抑制环流,分析了两个独立电源供电的两台驱动器并联结构系统,阐述了环流的特性,并提出了基于环流反馈的控制结构。这种控制结构通过环流的反馈,只需要控制调整其中一台驱动器,就可减小两台驱动器输出电压的差异,实现环流抑制。仿真结果表明:这种控制结构降低了控制的复杂性,能够抑制环流,实现独立电源供电的无刷直流电机驱动器并联。     

飞机反区速度矢量不稳定及其控制的机理

在信号流图的基础上,提出多回路分析的方法,并用于研究反区时速度矢量不稳定及其稳定控制的机理。建立了纵向动力学的信号流图,并证明了一个回路的收敛性定理。在此基础上,通过理论分析得出了速度矢量不稳定在不同层面上的原因,也得出了速度和轨迹的发散度表达式等,并表明阻力-速度曲线、轨迹角-速度曲线、极曲线、阻力系数曲线等存在相互对应的反区和正区,并且阻力-速度曲线和轨迹角-速度曲线在斜率上成比例。研究得出进场动力补偿系统下速度矢量的稳定临界条件、收敛度、稳定机理等,理论分析和仿真比较了速度恒定进场动力补偿系统和迎角恒定进场动力补偿系统在控制性能上的差异。     

脉冲追赶式同步扫描下双基地雷达目标分辨力分析

脉冲追赶式同步扫描过程中,双基地雷达的目标分辨力不仅与雷达参数有关,而且还与脉冲追赶进程密切相关.分析了双基地雷达距离、角度和多普勒分辨力的影响因素,并对其在脉冲追赶情况下的变化规律进行分析,结果表明在每一脉冲追赶扫描周期内,双基地雷达的距离分辨力和多普勒分辨力不断提高,而角度分辨力则有所下降.     

A facility reliability problem: Formulation,properties, and algorithm

Having a robustly designed supply chain network is one of the most effective ways to hedge against network disruptions because contingency plans in the event of a disruption are often significantly limited. In this article, we study the facility reliability problem: how to design a reliable supply chain network in the presence of random facility disruptions with the option of hardening selected facilities. We consider a facility location problem incorporating two types of facilities, one that is unreliable and another that is reliable (which is not subject to disruption, but is more expensive). We formulate this as a mixed integer programming model and develop a Lagrangian Relaxation‐based solution algorithm. We derive structural properties of the problem and show that for some values of the disruption probability, the problem reduces to the classical uncapacitated fixed charge location problem. In addition, we show that the proposed solution algorithm is not only capable of solving large‐scale problems, but is also computationally effective. © 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2010     

试析世博安保中的军事“软实力”运用

世博会的圆满召开，不仅需要强大的军事“硬实力”作后盾，也需要军事“软实力”作支撑。本文从军事“软实力”的基本概念入手，将其分解为感化认同力、形象吸引力、心理威慑力等三个子要素；从各要素出发，以完成世博安保任务为着眼点，提出加强军事“软实力”的具体思路。     

Resequencing with parallel queues to minimize the maximum number of items in the overflow area

This article treats an elementary optimization problem, where an inbound stream of successive items is to be resequenced with the help of multiple parallel queues in order to restore an intended target sequence. Whenever early items block the one item to be currently released into the target sequence, they are withdrawn from their queue and intermediately stored in an overflow area until their actual release is reached. We aim to minimize the maximum number of items simultaneously stored in the overflow area during the complete resequencing process. We met this problem in industry practice at a large German automobile producer, who has to resequence containers with car seats prior to the assembly process. We formalize the resulting resequencing problem and provide suited exact and heuristic solution algorithms. In our computational study, we also address managerial aspects such as how to properly avoid the negative effects of sequence alterations. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 401–415, 2016     

敷设气囊的充水圆柱壳的声辐射特性

为降低充水圆柱壳受内部点声源激励时的水下辐射噪声,在其外壳上敷设气囊,形成气囊圆柱壳。为指导气囊圆柱壳的设计,将充水裸圆柱壳和充水气囊圆柱壳分别简化为单、双层无限长隔板。比较隔板、气体与水的波阻抗,分析气体声速与层厚对双层无限长隔板在平面声波入射时的低频声辐射的影响机理。分析表明,声速小的气体和适当的气层厚度可以降低双层障板的辐射噪声。采用声无限元法计算气囊圆柱壳的水下声辐射,结论与对隔板的机理分析吻合。优化设计出的充水CO2气囊圆柱壳的水下辐射声功率与远场辐射声压明显低于充水裸圆柱壳。     

热障涂层厚度及其涂敷下材料内部缺陷的红外定量识别

针对热障涂层结构材料红外定量检测存在的不足,提出基于脉冲相位的LM(LevenbergMarquardt)识别算法。针对研究问题,建立了轴对称圆柱坐标下热障涂层结构材料的瞬态导热模型,利用有限体积法计算出检测表面的温度场,经快速傅里叶变换得到检测表面的相位分布,分析待检测参数对检测表面相位差的影响。以相位为识别条件,采用LM反演算法对热障涂层厚度及其涂敷下材料内部缺陷位置大小进行定量识别,并采用数值实验方法验证了基于相位的LM识别方法的有效性。