软件可测性评估

介绍了现有的软件可测性评估方法,继而提出了基于程序结构的软件可测性评估方法,该方法充分考虑了软件的失效机理,针对测试对象的不同特点,给出了面向控制流的软件故障执行的概率、数据状态感染的概率及以变量的定值-引用为基础的被感染数据状态传播到输出的概率等估计方案,在此基础上,进行了软件可测性的评估.     

扑翼UUV前肢驱动机构设计

通过对海龟前肢运动特点的分析和研究,对扑翼进行受力分析,充分利用惯性与流体力的作用,基于Unigraphics软件,实现前肢扑翼驱动机构的虚拟样机设计,简述此机构的周期运动过程,通过计算与仿真得出其粗略的推进力曲线及驱动电机参数,验证了机构的合理性。     

信息熵和判断矩阵的专家聚类赋权法

为了降低专家聚类赋权过程中由排序向量引起的不确定性和判断矩阵引起的矛盾性,提高权值分配的精确性,提出了基于信息熵和判断矩阵相结合的专家聚类赋权法。该方法采用聚类分析原理,对排序向量进行分类,根据分类结果、信息熵值和一致性比率确定专家权重系数。实例分析表明:基于信息熵和判断矩阵相结合的专家聚类赋权法在具体应用中得到的结果离期望值更近,说明该算法有效可行。     

故障传播有向图在地面电源故障诊断的应用

基于图论的故障诊断方法能够有效地缩小故障源的搜索范围,在最短的时间内找到真正产生故障的部件。采用故障传播有向图的方法对某飞行器地面电源故障诊断算法进行了研究,针对该飞行器地面电源的物理结构及相关的电气特性得到其故障传播有向图,并经过一些运算后将有向图进行了分层重构,最后利用故障定位算法模拟了故障定位的过程,得到了很好的效果。     

一种改进的SIR粒子滤波方法

SIR粒子滤波算法在重采样无法进行时可能失效,详细分析了算法失效的原因,并针对此问题提出了基于PSO的改进方法,该方法利用PSO的智能寻优机制引导重要性抽样的粒子移向高似然区,从而确保重采样过程的顺利进行。仿真试验表明,提出的改进方法可以有效解决SIR算法因重采样无法进行而导致的失效问题。     

陶瓷基复合装甲防12.7mm穿甲燃烧弹的靶试研究（Ⅱ）

基于对材料特性和防弹机理的认识,设计了由（SiC＋Si）陶瓷、616装甲钢和高强PE材料构成的陶瓷基复合靶板,靶板防护面密度为118 kg/m2,尺寸为500 mm×500 mm×25 mm。利用现役12.7 mm穿甲燃烧弹考核靶板在6发弹打击下的防护能力,检验靶板设计思路。结果表明：靶板结构是可行的,可防住V25为818 m/s的现役12.7 mm穿甲燃烧弹。     

某型火炮制退机节制环磨损故障分析与处理

制退机的性能好坏直接关系到火炮作战效能的发挥。针对目前装备保障方式大多停留在维修层面而理论研究不够深入的实际,对节制环磨损故障的机理进行分析。以某型火炮短节制杆式制退复进机为对象,利用MATLAB数值计算平台,编程仿真节制环磨损故障对后坐的影响。同时探讨了故障后对火炮的处理方案。研究表明,节制环磨损对后坐诸元都将产生不同影响,针对影响的程度可制定相应的故障处理方案。仿真模拟和方案探讨对装备保障工作具有参考意义。     

Bounding the optimal burn‐in time for a system with two types of failure

Burn‐in is a widely used method to improve the quality of products or systems after they have been produced. In this paper, we consider the problem of determining bounds to the optimal burn‐in time and optimal replacement policy maximizing the steady state availability of a repairable system. It is assumed that two types of system failures may occur: One is Type I failure (minor failure), which can be removed by a minimal repair, and the other is Type II failure (catastrophic failure), which can be removed only by a complete repair. Assuming that the underlying lifetime distribution of the system has a bathtub‐shaped failure rate function, upper and lower bounds for the optimal burn‐in time are provided. Furthermore, some other applications of optimal burn‐in are also considered. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004     

动态系统可靠性分析的新概念

传统可靠性分析的概念只能描述静态逻辑关系,不能满足现代复杂动态系统可靠性分析的需要。在给出动态系统状态空间结构和结构函数的基础上,提出失效序列和失效丛的概念描述动态系统的故障模式,这一概念扩展了传统可靠性分析的概念,将割集、蕴含集等作为其在静态情形的特例。给出动态系统部件的概率重要度、结构重要度以及关键重要度的概念,用实例对提出的有关概念进行了说明。     

Heart analytics: Analytical modeling of cardiovascular care

Cardiovascular diseases (CVDs) are the leading cause of death and disability both in the United States and worldwide. Despite high morbidity, mortality, and cost in the United States and global healthcare systems, cardiovascular care has been understudied in the healthcare operations management literature. In this paper, we identify research opportunities for healthcare operations management scholars to aid in improving cardiovascular care. We focus on three burdensome conditions, including (1) coronary artery disease, (2) stroke, and (3) heart failure, which, collectively, lead to the vast majority of CVD‐caused mortality and disability. For each condition, we characterize a typical patient's journey in receiving cardiovascular care, elucidating key challenges in improving care and outlining research questions for healthcare operations management scholars. We close with a reference to new research opportunities that emerge as artificial intelligence is likely to transform much of cardiovascular care.