一种确定检测时间的方法

在许多作为侦察用的无源传感器只报出其检测结果时,利用此传感器一系列检测报告确定被检测目标何时进入及何时离开此传感器检测区域,成为解决决策级信尽融合问题的关键。本文讨论了一种利用序贯分析方法计算检测时间的近似方法。     

垂直行程差的数学分析

本文论述了垂直行程差的定义,利用概括的矩阵分析方法推导出垂直行程差的通用计算公式,同时给出了特定条件下的计算公式与简化计算公式,文中分析了各种近似计算公式的计算精度,研究了垂直行程差函数的图象特点。     

Effect of nano powder (Al2O3-CaO) addition on the mechanical properties of the polymer blend matrix composite

This work describes the preparation and study of the properties of composite nanoparticles prepared by the sol-gel method which consists of two materials (Al₂O₃-CaO), and study the effect of these nanoparticles on the mechanical behavior of a polymer blend (EP 4% + 96% UPE). The powder was evaluated by X-ray diffraction analysis, scanning electron microscopy analysis (SEM), particle size analysis, and energy dispersive X-ray analysis (EDX). The mechanical behavior of the composite material was assessed by tensile test, bending test and hardness test. The evaluation results of the composite nanoparticles showed good distribution of the chemical composition between aluminum oxide and calcium oxide, smoothness in particles' size at calcination in high and low temperatures, formation of different shapes of nanoparticles and different (kappa and gamma) phases of the Al₂O₃ particles. The results of mechanical behavior tests showed marked improvement in the mechanical properties of the resulted composite material, especially at 1.5%, compared with polymer blend material without nano powder addition. The tensile properties improved about (24 and 14.9) % and bending resistance about (23.5 and 16.8) % and hardness by (25 and 22) % when adding particles of size (63.8 and 68.6) respectively. Therefore, this reflects the efficiency of the proposed method to manufacture the nanocomposite powder and the possibility of using this powder as a strengthening material for the composite materials and using these composite materials in bio applications, especially in the fabrication of artificial limbs.     

Steady-state analysis of load balancing with Coxian-2 distributed service times

This paper studies load balancing for many-server (N servers) systems. Each server has a buffer of size b ? 1, and can have at most one job in service and b ? 1 jobs in the buffer. The service time of a job follows the Coxian-2 distribution. We focus on steady-state performance of load balancing policies in the heavy traffic regime such that the normalized load of system is λ = 1 ? N^?α for 0 < α < 0.5. We identify a set of policies that achieve asymptotic zero waiting. The set of policies include several classical policies such as join-the-shortest-queue (JSQ), join-the-idle-queue (JIQ), idle-one-first (I1F) and power-of-d-choices (Po d) with d = O(N^α log N). The proof of the main result is based on Stein's method and state space collapse. A key technical contribution of this paper is the iterative state space collapse approach that leads to a simple generator approximation when applying Stein's method.     

知识图谱的预警探测体系探测效能贝叶斯评估方法

战争中,预警探测体系作为典型的复杂系统,其探测效能发挥情况的有效评估一直是亟需人们研究解决的重要现实问题。突破了传统效能评估方法的局限,在分析了知识图谱技术、贝叶斯评估方法基本原理的基础上,提出了基于两者综合运用的预警探测体系探测效能评估新方法,利用专家知识和实验数据构建知识图谱,并进一步使用贝叶斯网络方法实施知识推理,从而实现了体系探测效能评估。通过构建具体作战场景,验证了所提方法的有效性,并基于推演数据分析了所提方法的评估情况。     

落球法测定液体粘滞系数实验的改进

针对测定液体粘滞系数实验中所存在的问题,对小球下落时间的测量方法提出了改进,以提高实验精度,减小实验误差。     

军校开展案例教学之我见

案例教学作为一种行之有效的教学方法,有助于锻炼和提高军队院校学员分析问题、解决问题的能力,军校应正确认识案例教学的重要意义,深入探讨如何选编案例以及实施案例教学的具体措施。     

某型导弹发射仪可靠性Bayes设计与实现

某型导弹发射仪主要是用于发射舰载新型反舰导弹的保障设备,对其工作性能可靠度的高低直接关系到系统的正常使用,所以系统的高可靠性是该导弹发射仪设计的首要指标之一.在对某型导弹发射仪进行可靠性设计时,经过对系统构成要素的分析,在充分论证系统可靠性的基础上,运用可靠性的估计相关理论和数学理论,建立了某导弹发射仪的可靠性模型,运用Bayes方法进行了可靠性评定,计算表明该系统的可靠性达到了设计指标要求,对实际系统工程的可靠性设计与评定具有较好的借鉴作用.     

面向对象方法的一类飞行器模拟器设计与实现

对一类C4I飞行器模拟器的设计与实现进行了研究.该模拟器是分布式C4I仿真系统中的兵力生成子系统,起着演示指控效果、检验决策质量的重要作用.从系统需求出发,采用面向对象的方法对它进行了分析与设计,并最终实现了飞行器模拟器软件系统.该系统已成功应用于某防空C4I仿真试验床中,C4I联机试验表明,飞行器模拟器能较好地模拟指控命令响应并提供较高精度的飞行导航模拟数据.此外,面向对象方法的采用,不仅使系统功能得到了加强,也大大缩短了系统的开发周期.     

基于ISM的武器装备效能评价体系的构建方法

将系统工程中解释结构模型法引入到武器装备效能评价体系的构建过程中,在可拓空间确定武器效能影响因素逻辑关系的基础上,求解系统可达矩阵,建立结构模型,构建多层递阶的效能评价指标体系;应用该ISM,分析了评价体系的内部层次结构及主次因素,掌握系统评价的神经支撑结构;并以机动性指标为例,确定了单指标的因素支撑影响图。系统效能ISM的建立,可为确定提高武器效能的突破点、研发(R&D)控制的立足点等方面进行系统解释,为科学建立评价体系、判定内部结构提供理论基础。