中国上市公司股份回购的系统研究

2005年6月6日,中国证监会颁布了《上市公司回购社会公众股份管理办法(试行)》,规范了我国上市公司的股份回购行为。股份回购在经济发展中有许多积极作用。本文通过建立股份回购模型,来系统研究上市公司股份回购的财富效应。     

Accounting for Both Random Errors and Systematic Errors in Uncertainty Propagation Analysis of Computer Models Involving Experimental Measurements with Monte Carlo Methods

A Monte Carlo method is presented to study the effect of systematic and random errors on computer models mainly dealing with experimental data. It is a common assumption in this type of models (linear and nonlinear regression, and nonregression computer models) involving experimental measurements that the error sources are mainly random and independent with no constant background errors (systematic errors). However, from comparisons of different experimental data sources evidence is often found of significant bias or calibration errors. The uncertainty analysis approach presented in this work is based on the analysis of cumulative probability distributions for output variables of the models involved taking into account the effect of both types of errors. The probability distributions are obtained by performing Monte Carlo simulation coupled with appropriate definitions for the random and systematic errors. The main objectives are to detect the error source with stochastic dominance on the uncertainty propagation and the combined effect on output variables of the models. The results from the case studies analyzed show that the approach is able to distinguish which error type has a more significant effect on the performance of the model. Also, it was found that systematic or calibration errors, if present, cannot be neglected in uncertainty analysis of models dependent on experimental measurements such as chemical and physical properties. The approach can be used to facilitate decision making in fields related to safety factors selection, modeling, experimental data measurement, and experimental design.     

论股权分置与股票市场系统风险

本文以股票市场系统风险的基本理论为基础,对我国股权分置的现状进行了分析,论述了股权分置与股票市场系统风险之间的关系,并提出了相应的对策。     

语篇阅读教学中篇内语境的系统化建构

语篇阅读是语言学习者最基础的语言输入方式,阅读者除了需要了解语篇的文化及情景语境外,还要熟知语篇内在的逻辑衔接。篇内语境系统化建构有助于语言学习者理解语篇意义,便于篇章阅读。     

翻译审美中的系统分析方法

文章将计算机科学和系统分析的理论引入翻译中的审美过程,建议运用系统分析的方法对原文的审美要素进行分析,筛选出最佳的表达方案,以求在译文中最大限度地保留原文信息,有利于激发创造性的思维。     

企业竞争力的一个经济的和系统的分析框架

企业的竞争力在本质上是企业作为一种生产力系统的系统质 ,具有凸现性和不可还原性。所以 ,可以从企业的资源、制度和环境等角度进行研究 ,但必须用系统质这个新范式对各种企业竞争力理论进行有效的整合     

水杉发现过程的系统研究

水杉（Metasequoia glyptostroboides Hu &; Cheng）的发现为中国植物学走向世界开辟了道路,被公认为是20世纪我国乃至世界植物界的重大发现。它的发现具有重大意义。目前,水杉已遍及我国大江南北25个省、市、自治区和世界50多个国家和地区,已成为重要的用材林树种、沿海防护林树种、农田防护林树种、城市绿化与风景景观林树种。有关水杉发现过程及时间的说法甚多, 以至于它的发现成为植物学发展史上的一桩趣事。该文对水杉的有关资料和实物依据进行了系统的调查研究,同时对发现过程进行了概述。     

从立法层面构建我国的风险投资法律环境

风险投资的健康发展需要良好的风险投资法律环境作为保障,而我国当前的风险投资法律环境存在立法层面的专门国家立法缺位、相关法的规范滞后以及已存制定法统一性差等诸多问题,有必要从立法角度予以系统性构建.     

Some remarks on the traditional way of circular and diagonal circular systematic sampling schemes

ABSTRACT

In this paper, some deficiencies in traditional selection procedure of circular version of systematic sampling schemes are investigated and alternative methods are proposed. We also suggest some rules of thumb for coincidence of units in the sample. The end corrections proposed by Bellhouse and Rao (1975 Bellhouse, D.R., Rao, J.N.K. (1975). Systematic sampling in the presence of a trend. Biometrika. 62:694–697.[Crossref], [Web of Science ®] , [Google Scholar]) and Sampath and Varalakshmi (2008) for circular systematic sampling and diagonal circular systematic sampling, respectively, are also modified.     

Bounds on deviations of estimates arising in finite population regression models

Bounds for the maximum deviation between parameters of a finite population and their corresponding sample estimates are found in the multiple regression model. The parameters considered are the vector of regression coefficients and the value ofthe regression function for given values of the independent variable (or variables). Applications are considered to several widely employed sampling methods.