基于虚拟仪器技术实现测试技术教学改革的研究

文章结合"机械工程测量与试验技术"课程实际章节内容,研究应用虚拟仪器技术,建立计算机辅助教学系统,实现融合性教学,为测试技术教学的改革提供论证和实例。     

Estimation of the number of studies with positive trends when studies with negative trends are present

A two-point estimator is proposed for the proportion of studies with positive trends among a collection of studies, some of which may demonstrate negative trends. The proposed estimator is the y-intercept of the secant line joining the points (a, F?(a)) and (b, F?(b)), where F?(p) is the empirical distribution function of p-values from one-tailed tests for positive trend derived from the individual studies. Although this estimator is negatively biased for any choice of the points 0 ≤ a < b ≤ 1, the bias is less than that of the previously proposed one-point estimator defined by setting b = 1. The bias of the two-point estimator is smallest when a and b approach the inflection point of the true distribution function, E [F?(p)]. The utility of the two-point estimator is demonstrated by using it to estimate the number of male-mouse liver carcinogens among carcinogenicity studies conducted by the National Toxicology Program.     

Statistical methodology for assessing homology of intronic regions of genes

We consider the problem of statistically evaluating the similarity of DNA intronic regions of genes. Present algorithms are based on matching a sequence of interest with known DNA sequences in a gene bank and are designed primarily to assess homology among exonic regions of genes. Most research focuses on exonic regions because they have a clear biological significance, coding for proteins, and therefore tend to be more conserved in evolution than intronic regions. To investigate whether the intronic features of genes whose expression is highly sensitive to environmental perturbations differ from genes that have a more constant expression, a collection of oncogenes, tumor suppressor genes, and nonregulatory genes involved in energy metabolism are compared. An analysis of the features of these genes' intronic regions result in clustering by regulatory group. In addition, Billingsley's test for Markov structure (1961) suggests that 67% of the intronic regions in this collection of genes show evidence of nonrandom structure, indicating the possibility of a biological function for these regions. The result of Billingsley's test for homology is used as input to a clustering algorithm. The biological significance of this methodology lies in the identification of groups based on the intronic regions from genes of unknown function. With the advent of rapid sequencing techniques, there is a great need for statistical techniques to help identify the purpose of poorly understood portions of genes. These methods can be utilized to assess the functional group to which such a gene might possibly belong.     

Computation of the percentage points and the power for the two-sided Kolmogorov-Smirnov one sample test

Two recursive schemes are presented for the calculation of the probabilityP(g(x)≤S _n (x)≤h(x) for allx∈®), whereS _n is the empirical distribution function of a sample from a continuous distribution andh, g are continuous and isotone functions. The results are specialized for the calculation of the distribution and the corresponding percentage points of the test statistic of the two-sided Kolmogorov-Smirnov one sample test. The schemes allow the calculation of the power of the test too. Finally an extensive tabulation of percentage points for the Kolmogorov-Smirnov test is given.     

移动机器人系统多传感器信息融合研究

多传感器信息融合是目前移动机器人领域的主要研究热点。全面讨论了多传感器信息融合技术的主要研究进展及其在移动机器人系统中的典型应用情况；简要介绍了多传感器信息融合的基本实现方法；系统分析了移动机器人系统中多传感器信息融合的主要研究目标与研究内容；在此基础上，提出一种基于多传感器信息融合的足球机器人定位与导航系统的设计实现方案。     

行业财务信息的业绩预测能力研究

不同的行业特征会使行业间的企业财务信息呈现不同的特点。实证结果显示:基于行业财务 信息的业绩预测的效果比不区分行业的预测效果好;而预测效果的好坏则与行业内部的竞争 结构有关。     

TVB法制剧集中的法制信息传播

利用法制剧集传播法制信息是一种新途径，它不仅有广泛的受众和影响力，而且能让人们在轻松愉快的氛围中了解不少法律常识。然而它又具有一定的缺陷，需要更加规范的管理和约束。     

供热系统的模糊信息分析与预测

本文通过对供热网中的不确定性信息的分析，给出了供热网的模糊数学模型、模糊信息预测方法及供热网信息预测算例。本文对系统信息管理及预测具有参考价值。     

健康动物肠菌群的毒性试验

1993年，作者从健康动物猪、鸡、兔、鱼等动物肠道中分离、鉴定出22株正常菌群，先后经过小鼠增重育肥试验、生物拮抗试验和肠菌群微囊化及保质观察的研究，筛选出12株优良菌株进行本次试验，试验结果表明．12株菌以不同菌量饲喂小鼠、雏鸡都显示出良好的安全性，未发现任何毒副作用。     

8种血清型禽大肠杆菌的生化反应及药物敏感试验分析

选取具有致病力8种血清（O1、O2、O6、O(35)、O(54)、O(55)、O(78)、O(103)）禽大肠肝菌进行生化反应及药物敏感试验，研究其生化特性及对药物的敏感性。结果表明：8种血清型大肠杆菌生化反应基本一致，所不同的是在卫予醇反应中，（O1、O2、O6、O(35)、O(105)）4种血清型大肠杆菌呈阴性；8种血清型大肠杆菌对了胶卡那霉素、痢特灵、链霉素、卡那霉素、新霉素、红霉素均呈极、高、中、低不同程度敏感，对万古霉素均不敏感；7种（除O6外）血清型大肠杆菌对氯霉素呈极敏感或高敏；6种（除O(35)、O(103)外）血清型大肠肝菌对庆大霉素呈高、中、低度敏感二种（O1、O2、O(54)、O(78)）血清型大肠杆菌对氨苄青霉素呈高度敏感；2种（O1、O2）血清型大肠杆菌对强力霉素、磺胺药、四环素呈中敏或极敏。