基于BP神经网络的函数逼近的MATLAB实现

BP神经网络由于它的学习能力和非线性特性,使其能够对非线性函数进行很好的逼近。通过对BP神经网络结构和MATLAB软件及其BP神经网络工具箱的应用研究,利用BP神经网络工具箱设计BP神经网络,用于对非线性函数的逼近,通过网络的训练、测试达到了预期的效果。     

Nonparametric validation of similar distributions and assessment of goodness of fit

In this paper the problem of assessing the similarity of two cumulative distribution functions F and G is considered. An asymptotic test based on an α-trimmed version of Mallows distance Γ_α( F , G ) between F and G is suggested, thus demonstrating the similarity of F and G within a preassigned Γ_α( F , G ) neighbourhood at a controlled type I error rate. The test proposed is applied to the validation of goodness of fit and for the nonparametric assessment of bioequivalence. It is shown that Γ_α( F , G ) can be interpreted as average and population equivalence. Our approach is illustrated by various examples.     

全自动热泵用四通电磁换向阀寿命试验台的研制

对JB/T7230 94热泵用四通换向阀进行了研究分析,用实际的制冷工质代替氮气,模拟四通换向阀的实际工作环境,测试四通换向阀的使用寿命.设计建造了一套全自动四通换向阀寿命测试系统,研制了试验环境空气处理系统,编制了工况参数控制和电气系统设计及软件程序,并进行了四通换向阀的寿命测试试验.试验结果表明,用制冷工质模拟实际工作条件能够准确测试四通换向阀的寿命.     

青少年犯罪社区矫正工作个案报告

社区矫正是一种与监禁矫正相对的行刑方式,当前青少年犯罪社区矫近日益引起社会各界的关注.A是安徽省某县社区服刑人员.通过对A的个性心理特征、心理健康状况以及家庭状况的分析,社区矫正工作者对A进行了4个月的社区矫正,A从思想到行为各方面都有很大进步,但仍然存在一些问题.     

Hypotheses Testing: Poisson Versus Self-exciting

Abstract.  We consider the problem of hypotheses testing with the basic simple hypothesis: observed sequence of points corresponds to the stationary Poisson process with known intensity. The alternatives are stationary self-exciting point processes. We consider one-sided parametric and one-sided non-parametric composite alternatives and construct locally asymptotically uniformly most powerful tests. The results of numerical simulations of the tests are presented.     

英语阅读能力及其测试:理论与实践

英语阅读是英语教学的重要环节。如何对阅读的教学进行检测以提高英语阅读的效率一直是应用语言学界及教育主管部门探索的问题。认识阅读的机理,了解语篇与读者阅读过程中的互动,有助于阅读能力检测的设计,进而确定检测的内容与形式。通过对某大学外语专业学生的阅读测试结果的各项指标(信度、效度、区分度)进行分析,可以看到,要设计出一套能准确反映出学生的阅读能力的测试题目绝非易事。需要进一步的理论探索与实践,才能不断完善。     

地下工程信息平台的研究

通过对当今国内外地下工程领域的技术现状及发展需求进行分析研究，提出了地下工程信息平台的基本架构，简述了各分层结构的功能，并对地下工程设计作业分系统进行了论述。     

CASE-DELETION DIAGNOSTICS FOR TEST STATISTICS IN MULTIVARIATE REGRESSION

Influence measures in multivariate regression analysis have been widely developed, especially through use of the case-deletion approach. However, there seem to be few accounts of the influence of observations on test statistics in hypothesis testing. This paper examines four common multivariate tests, namely the Wilks' ratio, Lawley-Hotelling trace, Pillai's trace and Roy's greatest root for testing a general linear hypothesis of the regression coefficients in multivariate regression. The influence of observations is measured using the case-deletion approach. The proposed diagnostic measures, except that of Roy's greatest root, can be expressed in terms of statistics without involving the actual deletion of observations. An illustrative example is given with satisfactory results.     

《理论力学》多媒体教学的探索与实践

作为技术基础课的理论力学在工科专业的整个教学过程中起着十分重要的作用。文章通过理论力学多媒体教学的探索与实践 ,指出只有把培养创新精神、激发学生学习能动性、理论联系实际的思想贯穿于整个多媒体课件的制作及各个教学环节中 ,才能使多媒体技术的应用与优质的教学效果相得益彰     

Operating characteristics and extensions of the false discovery rate procedure

Summary. We investigate the operating characteristics of the Benjamini–Hochberg false discovery rate procedure for multiple testing. This is a distribution-free method that controls the expected fraction of falsely rejected null hypotheses among those rejected. The paper provides a framework for understanding more about this procedure. We first study the asymptotic properties of the `deciding point' D that determines the critical p -value. From this, we obtain explicit asymptotic expressions for a particular risk function. We introduce the dual notion of false non-rejections and we consider a risk function that combines the false discovery rate and false non-rejections. We also consider the optimal procedure with respect to a measure of conditional risk.