再入机动弹头滚动回路鲁棒姿态控制系统设计

根据经典控制理论,引入姿态角加速度反馈,采用零、极点相消,变增益补偿等设计方法,所设计的再入机动弹头滚动回路姿态控制系统具有良好的快速性、稳定性和很强的鲁棒性。     

一种基于双基点复合物元法的装备维修保障系统评估方法

结合 TOPSIS 方法中双基点的概念,提出了一种基于双基点的复合物元评估方法.在对装备维修保障系统进行综合评价时,将几类保障系统作为物元事物,在确定理想物元和负理想物元的基础上,采用专家经验和熵权法相结合的方法确定各评价指标的权重系数,通过计算相对于双基点的关联度对评价对象进行排序.理论研究和实例分析表明,该方法便于扩展、易于计算机实现、推广性强,而且指标权系数采用主客观相结合的方法确定,更具有合理性.     

谈新时期发扬艰苦奋斗精神

艰苦奋斗精神在全面建设小康社会的新阶段有着丰富的科学内涵。新时期发扬艰苦奋斗精神有着重要的时代意义。当前 ,发扬艰苦奋斗精神必须着力解决好理想信念、创新理念、群众观点、节俭意识、领导带头五个问题。     

对一起烟头引起阴燃火灾的调查及思考

通过对一起影响和损失较大的通讯部门火灾的现场勘验,系统分析了火灾现场勘验的火势蔓延勘查思路,通过对阴燃的形成条件及规律的分析,运用起火点处排除法,准确认定了火灾原因,并由此次火灾的调查引起一系列的思考。     

National restrictions in multinational military operations: A conceptual framework

Recent scholarship in security studies has started to explore the causes and consequences of various forms of national restrictions in multinational military operations (MMOs). This article makes a conceptual contribution to this literature by developing a theoretical framework of national restrictions in MMOs that distinguishes between structural, procedural, and operational restrictions. I argue that these types of restrictions are governed by different causal mechanisms. Structural restrictions are relatively stable over time and effect deployment decisions irrespective of other factors. Procedural restrictions, on the other hand, can constitute veto points against deployment only in combination with distinct political preferences. Finally, operational restrictions directly affect the rules of engagement of troop contributing countries. The article illustrates the three types of restrictions and their interaction with empirical examples from a range of countries and sketches their impact on MMO deployment decisions and mandates.     

一般民用建筑火灾特点与起火部位认定

从建筑火灾特点出发,阐述了建筑火灾发展阶段的蔓延特点、烟气流动特性与起火部位的内在联系,说明这些建筑火灾特点对起火部位的认定作用。     

Terrorist choice: a stochastic dominance and prospect theory analysis

The paper explores terrorist choice by applying two well-known theoretical frameworks: stochastic dominance and prospect theory (PT). We analyse each pair of attack methods that can be formed from the RAND-MIPT database and the Global Terrorism Database. Instances of stochastic dominance are identified. PT orderings are computed. Attention is accorded to the identification of ‘trigger points’ and the circumstances that may lead to an increased likelihood that a terrorist will select an attack method associated with a higher expected number of fatalities, i.e. a potentially more damaging attack method.     

单像自标定的迭代优化方法

针对基于灭点的单像自标定方法精度不高的局限性,利用影像中的灭点和椭圆几何约束信息,提出一种迭代优化的单像自标定方法。根据极点-极线关系及其表示的正交性,由影像中的椭圆曲线及其所在平面的灭线确定一组正交共轭灭点对。利用这些正交共轭灭点对建立关于主距和主点的非线性模型,以主距的方差最小作为优化准则,并选用多个位置作为主点的初始值进行多次迭代优化估计,获得主距和主点的最优结果。仿真影像和真实影像实验结果表明,该方法能够有效地实现单像自标定。与基于灭点的摄像机标定方法相比,该方法能够获得更为满意的标定结果。     

迭代插值FPFH特征点云配准算法

针对三维激光扫描点云数据的配准问题,提出了一种基于FPFH特征的迭代插值配准新方法。配准过程中考虑到点云数据获取时,受扫描仪分辨率影响,点云局部或整体密度偏小,两次测量点云数据的相同位置不存在完全相同的点,以致对应点之间存在误差。为减小误差对配准精度影响,引入迭代插值方法,增加点云整体密度。配准过程通过计算关键点处FPFH特征寻找对应相关关系求得粗配准旋转平移矩阵,再使用ICP算法进行点云的精确配准。实验结果表明,改进的配准方法简单、稳定可靠、计算速度快且计算复杂度小,对实现点云配准具有实用价值。     

警用装备综合保障效能的熵权-双基点法评估

为实现对警用装备综合保障效能的定量评估,构建了包括战备完好性、保障资源适量性、保障经济性、保障时效性、保障信息化、保障精确性、保障弹性、保障综合性8个评估指标的综合保障效能评估体系,建立了基于熵权-双基点方法的综合效能评估模型,通过编程计算对某警用装备的5种综合保障方案进行了定量评估,根据效能优属度确立了较为优化的综合保障方案。该模型克服了主观赋权的缺陷,可以为警用装备综合保障方案的优选提供科学依据。