土木工程专业《混凝土结构》课程教学方法和内容探讨

文章从土木工程专业的《混凝土结构》课程着手,探讨了适应新变革需求的教学内容和方法,提出了自己的认识,以期得到广泛的重视和认同,从而保证相关教学工作能顺利进行。     

企业营销道德水准测试的指标体系及评价方法研究

本文是“企业营销道德水准测试及评价系统”课题的前期研究成果。作者首先通过探测性调研确定了影响营销道德水准评价的企业营销行为,并在定量调研基础上将其归并为七个评价营销道德水准的维度,同样还根据定量调研的结果确定了企业营销道德水准的测评方法,为营销道德水准测试与评价系统的建立构筑了重要基础。     

“以学生为中心的主题教学模式”实验研究

通过“以学生为中心的主题教学模式”教改实验测试成绩数据和一系列调查结果的比较分析 ,说明了教学改革对于大学英语课堂教学的效果和学生学习能力的培养有着十分重要的作用     

Measurement error, skewness, and risk analysis: coping with the long tail of the distribution.

Probabilistic risk analyses often construct multistage chance trees to estimate the joint probability of compound events. If random measurement error is associated with some or all of the estimates, we show that resulting estimates of joint probability may be highly skewed. Joint probability estimates based on the analysis of multistage chance trees are more likely than not to be below the true probability of adverse events, but will sometimes substantially overestimate them. In contexts such as insurance markets for environmental risks, skewed distributions of risk estimates amplify the "winner's curse" so that the estimated risk premium for low-probability events is likely to be lower than the normative value. Skewness may result even in unbiased estimators of expected value from simple lotteries, if measurement error is associated with both the probability and pay-off terms. Further, skewness may occur even if the error associated with these two estimates is symmetrically distributed. Under certain circumstances, skewed estimates of expected value may result in risk-neutral decisionmakers exhibiting a tendency to choose a certainty equivalent over a lottery of equal expected value, or vice versa. We show that when distributions of estimates of expected value are, positively skewed, under certain circumstances it will be optimal to choose lotteries with nominal values lower than the value of apparently superior certainty equivalents. Extending the previous work of Goodman (1960), we provide an exact formula for the skewness of products.     

基于资源观的企业IT能力理论及实证研究

本文研究目的是探讨企业IT能力的构成、测量及其提升问题.基于我国信息化实践背景,以企业资源观(Resource-based View)为理论依据,提出IT能力构成维度的概念模型,设计问卷及测量问题,并进行了数据收集以及信度、效度检验等实证研究对理论模型予以验证.最后,根据数据分析结果,为企业建立IT能力给出一系列的指导建议,从而有助于通过IT应用获取竞争优势.     

A Class of Estimators Using Auxiliary Information for Estimating Finite Population Variance in Presence of Measurement Errors

This article addresses the problem of estimating the population variance using auxiliary information in the presence of measurement errors. When the measurement error variance associated with study variable is known, a class of estimators of the population variance using auxiliary information has been proposed. We obtain the bias and mean squared errors of the suggested class of estimators upto the terms of order n ^?1, and also optimum estimators in asymptotic sense of the class with approximate mean squared error formula.     

用8—羟基喹啉化学修饰电极测定人体痕量铊

本文用强吸附法研制了8—羟基喹啉化学修饰电极,并将其应用于人体痕量铊的分析。该方法具有较高的灵敏度和较好的选择性。检出下限为5×10-11mol·l-1,实测人体样品铊的回收率为94±44%,变异系数CV=46%。     

Approximate Likelihoods for Generalized Linear Errors-in-variables Models

When measurement error is present in covariates, it is well known that naïvely fitting a generalized linear model results in inconsistent inferences. Several methods have been proposed to adjust for measurement error without making undue distributional assumptions about the unobserved true covariates. Stefanski and Carroll focused on an unbiased estimating function rather than a likelihood approach. Their estimating function, known as the conditional score, exists for logistic regression models but has two problems: a poorly behaved Wald test and multiple solutions. They suggested a heuristic procedure to identify the best solution that works well in practice but has little theoretical support compared with maximum likelihood estimation. To help to resolve these problems, we propose a conditional quasi-likelihood to accompany the conditional score that provides an alternative to Wald's test and successfully identifies the consistent solution in large samples.     

金融计量新方法——有效矩方法理论研究进展

由Gallant，Tauchen（1996），Gallant，Long（1997）发展并完善的有效矩方法（Efficient Method of Moments，简记为EMM）是现代金融理论中模型设定分析的有效方法。本文对EMM理论研究进展进行了综述并指出了其中还存在的一些不完善和值得继续研究的地方。