关于跨文化交际研究的几点理论探索

This paper mainly focuses on the theoretical bases of intercultural communication by analyzing reasons of IC studies'emergence,researches done on IC by linguists and English teachers,and some difficulties concerning intercultural communication studies.     

Genetic algorithms for numerical optimization

Genetic algorithms (GAs) are stochastic adaptive algorithms whose search method is based on simulation of natural genetic inheritance and Darwinian striving for survival. They can be used to find approximate solutions to numerical optimization problems in cases where finding the exact optimum is prohibitively expensive, or where no algorithm is known. However, such applications can encounter problems that sometimes delay, if not prevent, finding the optimal solutions with desired precision. In this paper we describe applications of GAs to numerical optimization, present three novel ways to handle such problems, and give some experimental results.     

比较视野下安全生产的政府管制研究

随着我国经济建设的快速发展,安全生产事故也层出不穷,煤矿、交通和建筑业等更是事故多发行业。本文从政府失灵理论入手,探求目前我国严峻的安全生产形势背后的政府管制无力状况,通过比较国内外安全生产政府管制各方面的举措,对我国安全生产政府管制体系的改革与创新提出建议。     

基于面板数据的中国农业信贷绩效研究

文章基于面板数据,利用固定效应估计法和随机效应估计法,对我国在1999年至2002年间农业信贷的绩效作出实证研究。研究结果表明,我国农业信贷配置机制应作进一步的调整,以便提高农业信贷的绩效,支持农业发展。     

Effects of non-normality on the power function in a one-way random model

The effects of non-normality on type-I and type-II errors in a one-way random model are investigated for moderate departures from normality. It is found that the probabilities of both errors are more sensitive to the kurtosis of between group effects than that of within group effects.     

试析公共政策执行失灵

公共政策的目的在于调整和规范社会利益结构,以促进社会,经济健康,快速发展,从根本上有利于实现最广大人民群众的根本利益。在公共政策执行的过程中,出现了各种政策执行失灵现象,因此,有必要在探析公共政策执行失灵原因的基础上寻求解决问题的对策,从而保证公共政策的顺利实施。     

我国的土地储备制度：纠正市场失灵还是弥补计划缺陷？

从分析一般意义上的土地储备的含义出发,认为,在市场经济下,作为一项经济政策,土地储备制度在于维持市场均衡、弥补市场失灵。但通过对我国土地储备制度背景的实证分析认为,我国建立土地储备制度的主要目的是为了保障建设用地计划管理目标的实现,我国的土地储备制度不是为了纠正市场失灵而是为了弥补计划缺陷     

Using the EM-algorithm for survival data with incomplete categorical covariates

Incomplete covariate data is a common occurrence in many studies in which the outcome is survival time. With generalized linear models, when the missing covariates are categorical, a useful technique for obtaining parameter estimates is the EM by the method of weights proposed in Ibrahim (1990). In this article, we extend the EM by the method of weights to survival outcomes whose distributions may not fall in the class of generalized linear models. This method requires the estimation of the parameters of the distribution of the covariates. We present a clinical trials example with five covariates, four of which have some missing values.     

Testing the Goodness of Fit of Parametric Regression Models with Random Toeplitz Forms

ABSTRACT: We introduce a class of Toeplitz‐band matrices for simple goodness of fit tests for parametric regression models. For a given length r of the band matrix the asymptotic optimal solution is derived. Asymptotic normality of the corresponding test statistic is established under a fixed and random design assumption as well as for linear and non‐linear models, respectively. This allows testing at any parametric assumption as well as the computation of confidence intervals for a quadratic measure of discrepancy between the parametric model and the true signal g;. Furthermore, the connection between testing the parametric goodness of fit and estimating the error variance is highlighted. As a by‐product we obtain a much simpler proof of a result of 34 ) concerning the optimality of an estimator for the variance. Our results unify and generalize recent results by 9 ) and 15 , 16 ) in several directions. Extensions to multivariate predictors and unbounded signals are discussed. A simulation study shows that a simple jacknife correction of the proposed test statistics leads to reasonable finite sample approximations.     

球形微丸造粒机结构设计

本文从结构上阐述了球形微丸造粒机的造粒原理,并简要介绍了球丸造粒方法。