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在线评论所包含的产品特征观点在帮助用户做出购买决策时发挥着重要作用,然而,目前还没有挖掘客户评论中的产品特征观点作为主要数据来源的推荐系统,并且,监督型方法中提取特征观点对的算法较少关注中文句式结构,提取规则缺乏动态适应性.因此,提出一种基于特征观点对的产品推荐模型,首先,结合中文句式构成分析及特征观点的匹配关系分析,采用动态窗口提取特征观点对;在此基础上,结合特征树汇聚特征观点用于产品间比较,并...
基于积极情绪的扩展-建构理论,本文从工作投入短期波动的个体内部和动态视角探讨了积极情绪对工作投入的影响以及乐观的中介作用。采用经验取样法和日记法相结合的研究设计,对65个研究对象进行了连续14个工作日的测量,共获得65份个体数据和455份个体内数据。然后,采用滞后一天的数据对相关研究假设进行了检验。多层次分析结果表明:(1)前一天的积极情绪、乐观均对第二天的工作投入有显著正向的滞后影响;(2)前一...
本文选择典型企业为研究样本,借助规范的经典扎根理论,结合认知地图方法,研究了社会责任如何影响企业虚拟经营战略的问题。本文以企业社会责任(CSR)的视角,整合其社会层、组织层、个体层要素在不同发展阶段对虚拟经营战略的影响作用,以个体层要素为核心,融合社会层与组织层影响因素的主从关系,作用于企业各虚拟经营阶段的战略,构建出形象刻画该过程的理论模型及其影响因素的关系模型。进而运用空间向量的数学思想,构建...
技术距离、地理距离对大学-企业协同创新的影响研究
协同创新 技术距离 地理距离 知识生产函数
2016/11/29
扩充技术距离为横向的技术相似度与纵向的技术深度,并以铁路时间定义地理距离,采用改进的Jaffe-Griliches知识生产函数模型,选用2006~2014年间我国31个省级地区的大学-企业协同创新活动的数据,探讨技术距离、地理距离对大学-企业协同创新活动的影响。实证发现:横向、纵向的技术距离对大学-企业协同创新活动均有显著的促进作用,尤其是横向的技术相似度是影响协同创新的最主要因素之一;以铁路时间...
Colonial Institutions,Trade Shocks,and the Diffusion of Elementary Education in Brazil,1889–1930
History Literacy Characteristics Voting Education Spending Performance Improvement Government and Politics Brazil
2015/4/23
In this paper, we examine the role of trade shocks in promoting the diffusion of elementary education in subnational units in Brazil during a period (1889–1930) in which they had relative financial au...
Arts Districts, Universities, and the Rise of Digital Media
arts districts universities digital media creative economy
2014/11/27
In the last decade, arts and culture have been placed at the center of attention when discussing economic growth. In particular, studies on the “creative class” have been using arts and culture as an ...
Valuing Arts and Culture: A Research Agenda for Contingent Valuation
contingent valuation arts cultural property surveys arts fund raising federal aid to the arts
2014/11/27
Presents information on the application of contingent valuation methodology (CVM) to value arts and cultural resources. Basic elements of CVM surveys; Criticisms against CVM as a measurement tool; Sum...
How US cultural districts reshape neighbourhoods
cultural districts arts districts creative placemaking urban renewal social impacts economic impacts demographic change
2014/11/27
Cultural districts are an increasingly popular and important element of both urban and cultural experiences in the USA. Cultural districts get invoked as a tool for revitalising neighbourhoods and reg...
Professional Education for Emergency Managers
Emergency management Education Standards Principles
2014/11/27
The education of professional emergency managers has been the subject of workshops by the National Science Foundation and the National Academies. There is general agreement on the content of curricula...
Where the Cathedrals and Bazaars Are: An Index of Open Source Software Activity and Potential
Index construction open source software technology diffusion technology policy
2014/11/26
This article presents a framework to measure activity and potential for open source software development and use at a country level. The framework draws on interviews with experts in the open source s...
Review of the book Understanding homicide, Fiona Brookman. London: Sage Publications, 2005
book reviews criminal justice homicide
2014/11/26
In Understanding Homicide, Fiona Brookman presents a comprehensive overview of homicide in the United Kingdom. Like many topical texts, this book provides the reader with quantitative information that...
Contingent Valuation and Cultural Resources: A Meta-Analytic Review of the Literature
contingent valuation meta-analysis heritage willingness-to-pay
2014/11/26
Contingent valuation methodology (CVM) has been increasingly applied to cultural resources. CVM employs survey methods to gather stated preference information, which can be used to estimate economic v...
工程管理硕士教育现状及对策研究
工程管理硕士 教育现状 调查分析 对策研究
2014/6/12
基于工程管理硕士专业学位的本质特征,采用问卷调查法、综合分析法对我国工程管理硕士(MEM)专业学位教育现状进行分析。各培养单位在培养目标及学位论文选题方面要求明确,体现了“大工程”管理的思想,能结合自身学科优势努力办出特色,但在考生报考条件要求、课程设置、培养环节等方面还存在一些问题。在借鉴国内外工程管理硕士办学经验的基础上,提出加强工程管理硕士专业学位建设的对策。
英国高等教育系统科研评估制度最新改革及评鉴
英国高等教育研究机构 RAE评估 REF评估
2013/9/11
英国作为长期开展全国高等教育系统科研工作评估的国家,计划在2010—2014年实施新的高等教育系统科研评估制度(REF)。介绍了REF的产生背景、工作思路、实施程序、工作方法、评审内容及标准,并对该项制度体现的科技政策导向、工作目标定位、工作模式转变、社会对该项制度的认识等进行了梳理和分析。