Locally and maximin optimal designs for multi-factor nonlinear models

This paper considers the search for locally and maximin optimal designs for multi-factor nonlinear models from optimal designs for sub-models of a lower dimension. In particular, sufficient conditions are given so that maximin D-optimal designs for additive multi-factor nonlinear models can be built from maximin D-optimal designs for their sub-models with a single factor. Some examples of application are models involving exponential decay in several variables.     

Illustration of Sampling-Based Methods for Uncertainty and Sensitivity Analysis

A sequence of linear, monotonic, and nonmonotonic test problems is used to illustrate sampling-based uncertainty and sensitivity analysis procedures. Uncertainty results obtained with replicated random and Latin hypercube samples are compared, with the Latin hypercube samples tending to produce more stable results than the random samples. Sensitivity results obtained with the following procedures and/or measures are illustrated and compared: correlation coefficients (CCs), rank correlation coefficients (RCCs), common means (CMNs), common locations (CLs), common medians (CMDs), statistical independence (SI), standardized regression coefficients (SRCs), partial correlation coefficients (PCCs), standardized rank regression coefficients (SRRCs), partial rank correlation coefficients (PRCCs), stepwise regression analysis with raw and rank-transformed data, and examination of scatter plots. The effectiveness of a given procedure and/or measure depends on the characteristics of the individual test problems, with (1) linear measures (i.e., CCs, PCCs, SRCs) performing well on the linear test problems, (2) measures based on rank transforms (i.e., RCCs, PRCCs, SRRCs) performing well on the monotonic test problems, and (3) measures predicated on searches for nonrandom patterns (i.e., CMNs, CLs, CMDs, SI) performing well on the nonmonotonic test problems.     

美国的标准化考试对完善中国考试制度的启示

标准化考试从一个侧面反映了美国教育的现状。保持世界一流教育的观念已深深扎根于美国人的潜意识之中。因此不断改进教育质量,提高教育水平,成为美国历届政府孜孜以求的目标,而标准化考试则被认为是达到这一目标的手段。在美国这个多元文化并存、强调个性自由发展的国度里,各界人士对标准化考试众说纷纭。同样,中国教育界对标准化考试也是各执一说。在这种情况下,标准化考试在美国的得失对中国完善考试制度提供了借鉴。     

标准化学校:教育均衡发展视角下农村义务教育的发展路径

均衡化是当前基础教育发展的主题。就我国国情而言,教育均衡发展的重心在农村的义务教育。面对城乡教育发展严重不均衡的现实,如何缩小城乡教育差距,实现城乡教育相对均衡发展,成为一个亟待解决的课题。建设标准化学校是推进农村义务教育可持续发展,实现城乡教育均衡发展的根本路径。笔者就农村义务教育阶段建设标准化学校的内涵、必要性与可行性进行了分析,对标准化学校的标准体系作了初步探讨,并提出了建设标准化学校的实施策略。     

Evaluation of realized volatility predictions from models with leptokurtically and asymmetrically distributed forecast errors

Accurate volatility forecasting is a key determinant for portfolio management, risk management and economic policy. The paper provides evidence that the sum of squared standardized forecast errors is a reliable measure for model evaluation when the predicted variable is the intra-day realized volatility. The forecasting evaluation is valid for standardized forecast errors with leptokurtic distribution as well as with leptokurtic and asymmetric distributions. Additionally, the widely applied forecasting evaluation function, the predicted mean-squared error, fails to select the adequate model in the case of models with residuals that are leptokurtically and asymmetrically distributed. Hence, the realized volatility forecasting evaluation should be based on the standardized forecast errors instead of their unstandardized version.     

论媒体的民主政治功能及其程序化实现

媒体是现代民主政治的重要基础。媒体民主政治功能和作用的发挥,有赖于媒体政治活动程序化的推进。媒体民主政治活动的程序,就是实现媒体民主政治价值和功能的程序和次序,其中主要包括规范和次序两个方面。在构建过程中应该遵循新闻自由与社会责任相统一、增强可操作性、适时、适度和平衡等原则。     

从比较中外律师管理体制中探索中介组织规范化的途径

本文在介绍了中国和国外具有代表性的德国、日本、英国律师管理体制之后,对其共同性进行了归纳,同时又以中国律师管理体制为对照分析概括了上述各国律师管理体制的特点。并在此基础上,结合我国的实际情况,提出了以律师行业为代表的中介组织规范化途经。     

关于单项选择与多项选择题分值确定的探讨

针对标准化试题中多选题与单选题的分值确定问题，提出了综合难度系数法．运用该方法，可使各种选择题的分值确定更加合理、科学，并能客观、公正地反映应试者的真实情况．     

一种颇具特色的振动模型

结合国产 CDP—IIA 型电子皮带秤的机械系统,介绍一种十字弹簧单支承双悬臂多质点梁的线性振动模型,在一般教科书上尚属罕见。其振动研究为电子皮带秤的灵敏性、稳定性和可靠性分析提供了科学依据。     

毕业设计(论文)质量监控的研究与实践

毕业设计（论文）是学生完成本科学习的最后一个环节,是学生对所学知识进行全面梳理的重要步骤。为了加强对毕业设计（论文）全过程的管理,对之进行有效的监控,在全面质量管理理念的基础上提出了一个以评估为核心的毕业设计（论文）质量监控框架。通过对毕业设计（论文）各环节进行系统监控与评估,并将监控结果反馈给相应的主管部门,使毕业设计（论文）质量得到持续改进。