基于热物理仿真分析的红外点目标特征提取与识别

根据弹道中段空间目标和诱饵的表面温度分布规律，从热物理的角度分析了目标和诱饵的红外光谱辐射特性，指出了弹道中段目标和诱饵红外辐射特性的本质差别，并据此提出了红外目标识别中的特征基函数，用特征基函数构造红外点目标识别的四维特征矢量。仿真实验表明，这一特征矢量用于红外点目标识别非常成功。     

沉淀分级法调制纺丝级高熔点聚碳硅烷

作为碳化硅纤维先驱体的聚碳硅烷应当具有较高的熔点与良好的可纺性 ,但是提高熔点对合成条件提出了苛刻要求。为了解决这一矛盾 ,首先通过沉淀分级获得了高熔点 (>2 80℃ )的聚碳硅烷组分 ,然后再加入 10 - 30wt%低熔点组分来调节其纺丝性能 ,成功地调制出了高熔点 (>2 5 0℃ )、具有良好纺丝性的聚碳硅烷先驱体     

图像辅助智能终端定位的国内外研究进展

图像含有丰富的目标信息,被获取并处理后用于一种新型的智能终端定位手段。对图像定位的相关概念进行介绍,对关键技术的研究情况进行评述,并分别从图像定位作为独立的定位系统和图像定位与全球导航卫星系统(Global Navigation Satellite System,GNSS)及惯性导航系统(Inertial Navigation System,INS)等其他定位方法融合的定位系统2个方面阐述其研究进展,在此基础上提出图像辅助智能终端定位研究中存在的问题及发展方向。     

时序电路测试中敏化路径选择研究

时序电路测试产生过程中,在进行敏化路径选择时会遇到失败问题.本文针对迭代组合阵列模型测试中产生的这些问题进行了有益的探讨,并提出了改进的时序电路测试产生算法,使之更加完善.     

截尾序贯验后加权检验截尾点的优化设计

选取截尾点是截尾序贯验后加权检验很关键的一步,目前理论上尚无有效的选取方法。本文用优化技术确定截尾点Ｃ,克服了实践中确定停时Ｎ和截尾点Ｃ遇到的计算困难,避免了一般取Ｃ＝１的盲目性,使截尾点Ｃ的选取有了理论根据。优选的截尾点不仅使双方承担的风险之和最小,而且使双方承担的风险值相对合理,易于接受。     

关于大型线性规划问题鞍点算法的讨论

关于大型线性规划问题鞍点算法的讨论尚毅,张国光,成孟金（沈阳化工学院１１００２１）ＡＤｉｓｃｕｓｓｉｏｎｏｆｔｈｅＳａｄｄｌｅＰｏｉｎｔＡｌｇｏｒｉｔｈｍｆｏｒＬａｒｇｅＳｃａｌｅＬＰＰｒｏｂｌｅｍｓ￥ＳｈａｎｇＹｉ;ＺｈａｎｇＧｕｏｇｕａｎｇ;Ｃｈ...     

复杂系统的结构演变

考虑复杂性的一个侧面,从最简单的非线性方程出发,探讨战斗格局的结构演变和国防经费的良性循环,并通过这两个实例,揭示控制参数临界点的研究和度的把握,具有很大的理论意义和广泛的应用前景。     

隐蔽锥扫雷达波束的交叉点电平

本文根据隐蔽锥扫雷达天线的工作原理,从方向性函数出发,分析了接收状态下高频馈电网络中,和差信号的幅相特性与隐蔽锥扫波束交叉点电平的关系,从而对不能自动跟踪的隐蔽锥扫雷达,从天馈系统方面分析了原因,并为设计和部队维修提供了理论根据和有效方法。     

载人登月着陆窗口与定点返回轨道耦合设计

对于月面中高纬度着陆且定点返回地球中高纬度着陆场的载人登月任务而言,月面着陆窗口与定点返回轨道设计存在耦合关系,这是工程任务面对的关键技术之一。针对任务背景及约束条件,建立月面着陆窗口与定点返回轨道求解数学模型;通过数值求解着陆窗口与返回轨道参数规律,并从空间几何关系分析耦合机理;以2025年载人月面虹湾探测为例,给出了着陆窗口与定点返回轨道求解流程及验证算例。计算结果经商业软件STK校验正确,表明该方法是一种简捷精确的载人登月任务规划方法,可在未来载人登月工程任务规划时直接使用。     

Bayesian inference based on partial monitoring of components with applications to preventive system maintenance

Consider a binary, monotone system of n components. The assessment of the parameter vector, θ, of the joint distribution of the lifetimes of the components and hence of the reliability of the system is often difficult due to scarcity of data. It is therefore important to make use of all information in an efficient way. For instance, prior knowledge is often of importance and can indeed conveniently be incorporated by the Bayesian approach. It may also be important to continuously extract information from a system currently in operation. This may be useful both for decisions concerning the system in operation as well as for decisions improving the components or changing the design of similar new systems. As in Meilijson [12], life‐monitoring of some components and conditional life‐monitoring of some others is considered. In addition to data arising from this monitoring scheme, so‐called autopsy data are observed, if not censored. The probabilistic structure underlying this kind of data is described, and basic likelihood formulae are arrived at. A thorough discussion of an important aspect of this probabilistic structure, the inspection strategy, is given. Based on a version of this strategy a procedure for preventive system maintenance is developed and a detailed application to a network system presented. All the way a Bayesian approach to estimation of θ is applied. For the special case where components are conditionally independent given θ with exponentially distributed lifetimes it is shown that the weighted sum of products of generalized gamma distributions, as introduced in Gåsemyr and Natvig [7], is the conjugate prior for θ. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 551–577, 2001.