综合用户特征及专家信任的协作过滤推荐算法

协作过滤推荐算法是推荐系统中应用最广泛的算法之一。通过分析传统协作过滤算法中由数据稀疏性导致的推荐精度不高的问题,在基于专家信任的协作过滤推荐算法的基础上,提出了一种综合用户特征及专家信任的协作过滤推荐算法。该算法分析了用户的不同特征,比较了用户与专家的相似度,通过计算用户-专家相似度矩阵,有效降低了数据集的稀疏性,提高了预测的准确性。在MovieLens数据集上的实验结果表明,改进的算法能够有效缓解冷启动问题,明显提高了系统的推荐精度。     

浅谈高校环境系统分析课程教学改革

环境系统分析是高校环境科学与工程专业的基础学科之一,具有较强的理论性和综合性。文章对本课程的教学改革进行了探讨,提出在教学观念上应激励学生自主学习、培养综合能力为主,注重运用多种现代教育技术达到教学效果,课堂教学应采用案例教学、问题驱动、精讲要点及专题报告等多种教学方法,学生成绩的评定要注重平时成绩和综合能力的考核。     

The effects of Daubert on the adissibility of expert testimony in state and federal criminal cases.

Appellate opinions were evaluated on variables related to expert admissibility to assess the effects of Daubert v. Merrell Dow Pharmaceuticals, Inc. in criminal cases. Analysis reveals changes in appellate courts' consideration of Frye v. United States, the 4 Daubert criteria, and several Federal Rules of Evidence. The importance of Frye and the general acceptance criterion decreased over time, and the importance of the Daubert criteria increased over time. However, these changes were not consistent for all types of testimony. Overall, there is greater reliance on Daubert when determining the admissibility of a scientific expert. However, only criteria related to the Federal Rules of Evidence are reliably related to admissibility decisions. Details of appellate court application of the 4 Daubert criteria, the Federal Rules of Evidence, and other related factors are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

浅述广东省造纸产品结构现状

本文介绍了广东省造纸工业产品结构的状况,对其特点和存在的问题进行了分析,并对产品结构调整提出了一些意见和建议.     

Expert opinions on carbon dioxide capture and storage—A framing of uncertainties and possibilities

There are many uncertainties and knowledge gaps regarding the development of carbon dioxide capture and storage (CCS)—e.g., when it comes to costs, life-cycle effects, storage capacity and permanence. In spite of these uncertainties and barriers, the CCS research community is generally very optimistic regarding CCS’ development. The discrepancy between the uncertainties and the optimism is the point of departure in this study, which is based on interviews with 24 CCS experts. The aim is to analyse experts’ framings of CCS with focus on two key aspects: (i) the function and potential of CCS and (ii) uncertainties. The optimism among the CCS experts is tentatively explained. The interpretative flexibility of CCS is claimed to be an essential explanation for the optimism. CCS is promoted from a wide variety of perspectives, e.g., solidarity and peace, bridge to a sustainable energy system, sustaining the modern lifestyle and compatibility with the fossil fuel lock-in. Awareness of the uncertainties and potential over-optimism is warranted within policy and decision making as they often rely on scientific forecasts and experts’ judgements.     

Two new approaches for assessing the weights of fuzzy opinions in group decision analysis

The aggregation of fuzzy opinions is an important component of group decision analysis with fuzzy information. This paper proposes two new approaches for the assessment of the weights to be associated with fuzzy opinions. These approaches involve, respectively, the minimization of the sum of squared distances from one weighted fuzzy opinion to another, which is called the least squares distance method (LSDM), and the minimization of the sum of squared differences between the defuzzified values of any two weighted fuzzy opinions, which is called the defuzzification-based least squares method (DLSM). The two approaches are developed and numerical examples are presented to illustrate their simplicity and effectiveness in aggregating fuzzy opinions.     

中芬投资环境的比较分析

当前，国内外引资竞争日趋激烈。其中，投资已逐渐成为推进经济结构战略性的手段，投资环境的持续改善备受各国的高度关注。良好的投资环境是能够影响可预期的投资回报并产生较小的投资风险。文章把影响投资环境的各种因素归结为3个部分，并提出了改善投资环境的建议。     

女研究生与女大学生婚恋观的对比调查分析——以华中地区某高校为个案

在中国社会全方位的转型时期，各种新观念、新思潮层出不穷，女研究生作为一个备受关注的特殊群体，她们的婚恋观正在发生着温和而又深刻的嬗变。相对于女大学生而言，她们的恋爱目的更加明确和务实；在择偶标准上，具有长远眼光和理性色彩；对待与恋人间婚前性行为的态度更为明确。     

基于模糊推理的网络舆情预警方法

利用威胁估计方法研究网络舆情预警。从网络舆情社会学研究成果出发,分析网络舆情对社会影响的主要因素,选取了5种网络舆情分析指标;进而对各分析指标及舆情预警等级进行模糊化,建立模糊推理规则评估出预警等级。实验结果表明,该方法能够准确地估计出预警等级,符合专家经验判断。     

"Do not discount lay opinion": Comment.

Comments on the article by S. M. Kassin et al (see record 2001-17140-001) which discussed eye witness testimony. (PsycINFO Database Record (c) 2010 APA, all rights reserved)