A New Feature Selection Method for Text Categorization of Customer Reviews

With the rapid development of e-commerce, online consumer review plays an increasingly important role in consumers’ purchase decisions. Most research papers use the quantitative measures of consumer reviews for statistical analysis. Here we focus on analyzing the texts of customer reviews with text mining tools. We propose a new feature selection method called maximizing the difference. Various classification methods such as boosting, random forest and SVM are used to test the performance of the new method along with different evaluation criteria. Both simulation and empirical results show that it improves the effectiveness of the classifier over the existing methods.     

我国海上油田钻井完井投资测算方法研究

本文分析了我国海上油田钻井完井投资测算的现有方法,针对存在的问题和不足,从内生变量的选择、相关系数、变量的影响程度等方面进行分析研究,提出以作业周期、井深、水深三个因素进行测算的新方法。     

基于个体中心视角的大学生自杀风险特征

对大学生自杀风险进行分类,并重点分析性别、人格特质和父母教养方式对自杀风险的预测作用,能准确地筛查出自杀风险较高的学生,进行重点干预和辅导,防患于未然。研究结果发现,就自杀风险而言,女生比男生自杀风险更大些;人格特质中的稳定和忧虑,教养方式中的父母情感温暖、理解,对高风险和次高风险组具有显著预测作用。潜剖面分析模型在自杀风险因子检测、不同风险类型的特征识别等方面适应良好、作用明显;大学生自杀与心理危机风险的检测内容需要进一步优化完善,应将父母教养方式、个人成长经历、人格特质、生活应激、社会支持、抑郁情绪等多个相关风险因素纳入检测因子体系。     

论国际关系中有关权力分配的三种理论与战争

战争在人类社会由来已久,对于战争爆发的原因、制约战争的手段,现实主义学派内部有着不同的看法。其中,权力分配与战争的关联,成为研究、争论的一大焦点。均势论从权力的总体分配状况出发,认为权力的均衡会对战争产生制约。而权力转移论者则认为在大国间权力分配发生差异的背景下,权力的接近最易引发战争。攻防理论对权力做了进一步细分,从军事能力角度考察战争爆发的原因,并将其与其他要素结合进行考察。三种理论都从权力分配的角度解释战争,但侧重各有不同,既给我们提供了对战争的独特理解,也使得战争研究的内容更为丰富。     

Deriving Behavior Model Parameters from Survey Data: Self‐Protective Behavior Adoption During the 2009–2010 Influenza A(H1N1) Pandemic

In this paper, we demonstrate how public opinion surveys can be designed to collect information pertinent to computational behavior modeling, and we present the results of a public opinion and behavior survey conducted during the 2009–2010 H1N1 influenza pandemic. The results are used to parameterize the Health Belief Model of individual health‐protective decision making. Survey subjects were asked questions about their perceptions of the then‐circulating influenza and attitudes towards two personal protective behaviors: vaccination and avoidance of crowds. We empirically address two important issues in applying the Health Belief Model of behavior to computational infectious disease simulation: (1) the factors dynamically influencing the states of the Health Belief Model variables and (2) the appropriateness of the Health Belief Model in describing self‐protective behavior in the context of pandemic influenza.     

落下闳的族属之源暨浑天说、浑天仪所起源的族属

落下闳为巴人之源出赤狄支系皋落氏者,汉代浑天仪由落下闳始造,浑天仪所本理论为浑天说,而由落下闳的族属及其郡望学统、战国测星和西汉改历的史实、浑天思想的神话来源等观之,浑天说、浑天仪或非先秦华夏之族的旧学古器,而极可能起源于四夷中的狄、巴之族。     

先解决同龄退休，再讨论延迟退休

近来，关于退休政策改革的问题在媒体上讨论得沸沸扬扬，绝大多数甚至90％以上的人不同意延迟退休，这种“延迟退休”的讨论显然掩盖了“同龄退休”的问题。争取“男女同龄退休”的政策和权利，中国妇女为之奋斗了20多年，至今还没有获得突破性的进展。     

Measuring Loneliness Among Middle-Aged and Older Adults: The UCLA and de Jong Gierveld Loneliness Scales

This study examined the measurement and invariance properties of the R-UCLA and de Jong Gierveld loneliness scales for research involving middle-aged and older adults. Confirmatory factor analyses (CFAs) of data from interviews with adults aged 45–84 revealed limited support for the unidimensionality of either scale while subsequent analyses indicated the multidimensionality of both. However, method effects associated with positive and negative item wording were also evident. Multiple group CFAs provided limited support for assumptions of measurement invariance across age groups and from baseline to follow-up with regard to the R-UCLA scale. In contrast, strong measurement invariance across age groups and successive measurements was established for the bi-dimensional dJG scale. Overall, the findings supported the relative utility of the dJG scale for research involving middle-aged and older adults but suggested a need for attention to the implications of method effects associated with item wording and lack of measurement invariance with respect to item residuals.     

Socio-Cultural Impacts of Major Event: Evidence From the 2008 European Capital of Culture,Liverpool

Events are emerging worldwide and are seen to have significant economic and socio-cultural impacts on the destination and host society. However, there are only handful studies focusing on the socio-cultural impacts of events. This study fills in this gap by focusing on the socio-cultural impacts of the 2008 European Capital of Culture, Liverpool on the socially marginalised communities. The research is based on analysis of quantitative and qualitative data collected from four distinct neighbourhoods, which help to give a comparison of how major event influence a wide cross-section of the population. Totally 2,252 residents were surveyed over 3 years in order to track the changes of performance, and eight community workshops were conducted. The research findings point to three dimensions of socio-cultural impacts of the event which could contribute to the enhancement of quality of life, including participation and interest in cultural activities, accessibility and inclusion effect of cultural event, and social outcomes in terms of the enhancement of sense of place and local identity.