基于等价空间算法的飞控系统故障诊断

采用全局滤波法对操纵舵面损伤故障进行检测,等价空间法提取故障信息,以二元假设检验为判决准则,采用传感器数据融合方法进行预警、校验和隔离,作出故障诊断。仿真结果表明,该方法能大大提高故障诊断的速度和精度。     

中医证候的多元统计分析及方法研究

从"高脂血症及动脉粥样硬化痰瘀证候的蛋白质组学研究"的数据出发,研究影响中医证候的各主要因素。对11种可能的标志蛋白质(群)数据进行分析,以统计聚类为主导思想,给出变量聚类和样本数据聚类综合应用的方法,并结合医学角度对变量聚类结果的分析,指导组内和组间两种样本聚类讨论;同时,通过假设检验,从统计理论上对所得分类予以支持。最后得到标志蛋白质群{结合珠蛋白前体,α-胰蛋白酶抑制剂轻链,脂肪细胞脂质结合蛋白异构体3,补体C4}或{纤维蛋白原γ链,α-胰蛋白酶抑制剂轻链,未确定名称的蛋白(ID1485)}。考虑可能是区分高脂血症及动脉粥样硬化痰证和瘀证的标志蛋白质群,从而给出蛋白质水平上对痰证和瘀证判决方法的建议。     

基于多重假设检验市长公开电话文本的自动分类

提出一种基于多重假设检验的特征加权朴素贝叶斯分类算法, 该算法通过特征选择方法得到多个特征词集合, 再按多重假设检验错误率为每个特征词集合配以不同的权重系数并参与到分类器的构建中. 该方法已经应用到市长公开电话的文本分类中, 通过构建的3个特征加权朴素贝叶斯分类器实现了投诉文本的计算机自动分类, 且相对传统方法提高了分类器的效率和精度.     

论比较研究在运动训练中的应用

比较研究是现代科技发展中一种重要的认识方法。本文首先把训练中的统计比较方法概括为两种类型。然后对典型例证进行分析,将讨论引向深入,并提出了新的方法。     

Investigating the relationship between gold and silver prices

This paper analyses the long-run relationship between gold and silver prices. The three main questions addressed are: the influence of a large bubble from 1979:9 to 1980:3 on the cointegration relationship, the extent to which by including error-correction terms in a non-linear way we can beat the random walk model out-of-sample, and the existence of a strong simultaneous relationship between the rates of return of gold and silver. Different efficient single-equation estimation techniques are required for each of the three questions and this is explained within a simple bivariate cointegrating system. With monthly data from 1971 to 1990, it is found that cointegration could have occurred during some periods and especially during the bubble and post-bubble periods. However, dummy variables for the intercept of the long-run relationships are needed during the full sample. For the price of gold the non-linear models perform better than the random walk in-sample and out-of-sample. In-sample non-linear models for the price of silver perform better than the random walk but this predictive capacity is lost out-of-sample, mainly due to the structural change that occurs (reduction) in the variance of the out-of-sample models. The in-sample and out-of-sample predictive capacity of the non-linear models is reduced when the variables are in logs. Clear and strong evidence is found for a simultaneous relationship between the rates of return of gold and silver. In the three type of relationships that we have analysed between the prices of gold and silver, the dependence is less out-of-sample, possibly meaning that the two markets are becoming separated. © 1998 John Wiley & Sons, Ltd.     

对异丙醇——环己烷双液系相图实验条件改进的讨论

对异丙醇——环己烷双液系相图的实验条件作了改进。改进后得到的相图中与最低恒沸点相对应的最低恒沸温度和环己烷的体积百分比比改进前所得结果具有更高的精密度和更好的准确度,并用概率统计中的假设检验方法证明了改进后所得实验结果优于原条件下所得结果。     

新型分油机两相流场的有限元计算

采用两相流连续介质模型,对新型分油机内油水两相流动作了细致分析,并用有限元法解POISSON方程、N-S方程、连续方程的方法,对流场内压力场、速度场、浓度场进行了计算.计算结果与实际分油机分离现象相符,说明设计方案正确.为设计和维护保养提供一定依据.     

鸟类飞行起源的研究

鸟类飞行的起源在过去几十年中是进化生物学研究领域的一个热点问题,先期工作主要集中在关于飞行起源过程中的进化路径(主要包括树栖说和地栖说)的讨论,之后开始关注与飞行起源过程中相关的骨骼、肌肉等关键结构的演化。本文对飞行起源的研究历史做了简要的回顾,并从上述两个方面对近年来这一领域研究中取得的进展以及存在的争议做一概要的介绍。     

奇异非线性特征值问题的正解

研究了一类奇异非线性特征值问题正解的结构。证明了解集存在无界连通分支并给出了多个正解的存在性结果,推广和改进了以往的相关结果。     

New deghosting method based on generalized triangulation

A new deghosting method baaed on the generalized triangulation is presented. First, two intersection points corresponding to the emitter position are obtained by utilizing two azimuth angles and two elevation angles from two jammed 3-D radars (or 2-D passive sensors). Then, hypothesis testing baaed deghosting method in the multiple target scenarios is proposed using the two intersection points. In order to analyze the performance of the proposed method, the correct association probability of the true targets and the incorrect association probability of the ghost targets are defined. Finally, the Monte Carlo simulations are given for the proposed method compared with the hinge angle method in the cases of both two and three radars. The simulation results show that the proposed method has better performance than the hinge angle method in three radars case.