基于新消防法探析火灾事故调查工作

随着经济社会的高速发展，科学技术的突飞猛进，致灾因素随之剧增，火灾起数呈逐年上升趋势，而由于火灾事故调查结论引发的社会争议和种种诉讼越来越多，群众来信和上访逐年增多。结合新《消防法》对火灾事故调查工作的要求，从火灾原因认定、火灾损失统计和火灾事故处理三个层面上提出加强火灾调查工作的一些做法。     

PD反馈特征结构配置在最优控制问题中的应用

考虑了二阶线性系统的比例微分(PD)反馈特征结构配置问题以及其在最优控制问题中的应用。基于比例微分特征结构配置参数化方法,将二阶线性系统的最优控制问题转化为一个便于求解的有约束条件的极小值问题,并给出了相应的求解算法。三自由度质量弹簧阻尼系统算例及其仿真结果表明所提算法简单、有效。     

一种改进的无参考图像质量评估算法

无参考图像质量评估方法一直是图像质量研究所关注的重点。本文针对无参考图像质量评估问题，在当前被广泛接受的 DIIVINE 图像质量评估方法基础上进行了深入的研究，研究发现经典的 DIIVINE 方法中使用了过多的统计特征量，由于统计量无差别的使用影响了方法的预测性能。基于此，利用主成分分析（PCA）算法对该特征向量进行降维，得到“精简的特征向量”，用此向量可以达到更好的分类性能和评估性能。试验证明，在图像数据库上，该算法表现出较好的预测性能，其性能优于其他主流的无参考图像评估算法。     

《军械工程学院学报》（自然科学版）1989—2001年载文信息的统计分析

以《军械工程学院学报》 (自然科学版 ) 1989- 2 0 0 1年发表的 74 0篇论文为统计样本 ,对其载文信息进行统计分析。得到载文总量 ,平均年载文量 ,平均期载文量 ,篇均页码 ,信息密度 ,发文时滞 ,基金论文率等指标值 ,从一个侧面反映了学院的科研学术成果和《学报》的学术质量     

基于多元统计的空中目标区分方法

现代战争中的空情信息复杂多变,如何对空中目标合理地区分,以提取其主要信息,是空情信息处理的一个重要方面。基于多元统计的思想,采用聚类分析和判别分析的方法,对空中目标进行区分、辨别,以此为指挥人员提供作战决策的依据。     

Dynamic signatures and their use in comparing the reliability of new and used systems

The signature of a system with independent and identically distributed (i.i.d.) component lifetimes is a vector whose ith element is the probability that the ith component failure is fatal to the system. System signatures have been found to be quite useful tools in the study and comparison of engineered systems. In this article, the theory of system signatures is extended to versions of signatures applicable in dynamic reliability settings. It is shown that, when a working used system is inspected at time t and it is noted that precisely k failures have occurred, the vector s [0,1]^n‐k whose jth element is the probability that the (k + j)th component failure is fatal to the system, for j = 1,2,2026;,n ‐ k, is a distribution‐free measure of the design of the residual system. Next, known representation and preservation theorems for system signatures are generalized to dynamic versions. Two additional applications of dynamic signatures are studied in detail. The well‐known “new better than used” (NBU) property of aging systems is extended to a uniform (UNBU) version, which compares systems when new and when used, conditional on the known number of failures. Sufficient conditions are given for a system to have the UNBU property. The application of dynamic signatures to the engineering practice of “burn‐in” is also treated. Specifically, we consider the comparison of new systems with working used systems burned‐in to a given ordered component failure time. In a reliability economics framework, we illustrate how one might compare a new system to one successfully burned‐in to the kth component failure, and we identify circumstances in which burn‐in is inferior (or is superior) to the fielding of a new system. © 2009 Wiley Periodicals, Inc. Naval Research Logistics, 2009     

Consecutive k‐within‐m‐out‐of‐n:F system with exchangeable components

As a generalization of k‐out‐of‐n:F and consecutive k‐out‐of‐n:F systems, the consecutive k‐within‐m‐out‐of‐n:F system consists of n linearly ordered components such that the system fails iff there are m consecutive components which include among them at least k failed components. In this article, the reliability properties of consecutive k‐within‐m‐out‐of‐n:F systems with exchangeable components are studied. The bounds and approximations for the survival function are provided. A Monte Carlo estimator of system signature is obtained and used to approximate survival function. The results are illustrated and numerics are provided for an exchangeable multivariate Pareto distribution. © 2009 Wiley Periodicals, Inc. Naval Research Logistics 2009     

海底小目标数据库功能和运用方法研究

利用海底小目标数据库中的数据信息辅助探猎雷作战，可以摆脱传统探猎雷作战行动中的盲目性，优化反水雷作战流程，有效提高反水雷作战效率。如何科学构建数据库功能，合理设计数据存储、查询和调用的方式方法，以充分发挥各类探测数据的潜在作用，对辅助反水雷战术指挥决策具有重要意义。本文根据海底小目标对探猎雷作战的影响，提出目标位置比对、声纳图像比对、探测态势比对和数据统计分析是海底小目标数据库所应具备的主要功能，结合探猎雷过程中的典型作战环节，阐述了各项功能的基本运用方法和实现手段，指出数据的“量”“质”以及采集规范和维护管理制度，均是数据库建设的重要前提，并对建设数据库所应具备的保障条件进行了 说明。