Understanding the topic evolution of scientific literatures like an evolving city: Using Google Word2Vec model and spatial autocorrelation analysis     

Kai Hu  Qing Luo  Kunlun Qi  Siluo Yang  Jin Mao  Xiaokang Fu  Jie Zheng  Huayi Wu  Ya Guo  Qibing Zhu 《Information processing & management》2019,56(4):1185-1203

Topic evolution has been described by many approaches from a macro level to a detail level, by extracting topic dynamics from text in literature and other media types. However, why the evolution happens is less studied. In this paper, we focus on whether and how the keyword semantics can invoke or affect the topic evolution. We assume that the semantic relatedness among the keywords can affect topic popularity during literature surveying and citing process, thus invoking evolution. However, the assumption is needed to be confirmed in an approach that fully considers the semantic interactions among topics. Traditional topic evolution analyses in scientometric domains cannot provide such support because of using limited semantic meanings. To address this problem, we apply the Google Word2Vec, a deep learning language model, to enhance the keywords with more complete semantic information. We further develop the semantic space as an urban geographic space. We analyze the topic evolution geographically using the measures of spatial autocorrelation, as if keywords are the changing lands in an evolving city. The keyword citations (keyword citation counts one when the paper containing this keyword obtains a citation) are used as an indicator of keyword popularity. Using the bibliographical datasets of the geographical natural hazard field, experimental results demonstrate that in some local areas, the popularity of keywords is affecting that of the surrounding keywords. However, there are no significant impacts on the evolution of all keywords. The spatial autocorrelation analysis identifies the interaction patterns (including High-High leading, High-Low suppressing) among the keywords in local areas. This approach can be regarded as an analyzing framework borrowed from geospatial modeling. Moreover, the prediction results in local areas are demonstrated to be more accurate if considering the spatial autocorrelations.  相似文献   

一种基于模糊语言TOPSIS的应急决策方法     

李海明  虞钢  田崇鑫  尚国彬 《中国科学院大学学报》2020,37(6):814-819

在应急决策过程中，决策信息通常具有犹豫性、模糊性和非对称性，且决策者呈现出直观、快速的语言决策偏好。提出一种基于模糊语言TOPSIS的应急决策方法，使用犹豫模糊语言术语集和二元语义表达式对高度不确定环境下的语言进行处理，提高对犹豫模糊语言信息的提取能力，生成易于理解的语言评估结果，从而辅助决策者进行快速、准确的决策判断。案例证实该方法的可行性与有效性，为解决应急决策问题提供了一种新方法。  相似文献   

浅谈田径训练方法的特点及其新趋势     

侯珏文 《当代体育科技》2020,(11):52-52,54

与其他的体育运动项目相比,田径运动的历史要悠久许多。在田径运动项目中,成绩高低与田径训练中使用的训练方式有着很大的关联,同时田径训练方式的使用得当与否对于运动员的心理素质、训练效率、运动负荷等方面的提升有着十分显著的影响。本文就从当前的田径训练方式的特征分析出发,并以此为基础展望了未来田径训练方式的发展新趋势,以期对今后的田径训练方式发展提供相应的帮助。  相似文献   

电视新闻专题节目特点及发展趋势探析   总被引：1，自引：0，他引：1  

周琼 《新闻界》2008,(4):147-148

本文分析电视新闻专题节目的特点、优势以及存在的不足,探求其发展趋势,并提出建设性意见。  相似文献   

RDA与其中文译名   总被引：1，自引：0，他引：1  

吴晓静 《图书馆工作与研究》2008,(1):25-28

RDA 是国际编目界的热点问题,也越来越受到国内同仁的关注.本文介绍了 RDA 名称的由来,它的战略目标、结构与目前的进展情况,并简述从AACR2到RDA的主要变化.到目前为止,相关研究中提到RDA时,已经出现了几种中文译名,其中比较多见的有3种.本文建议,尽管RDA要到2009年才最终出版,但为了避免在以后的工作和研究中面临不必要的麻烦,现在就应该对RDA采用统一的中文译名.  相似文献   

The Development of Business-to-Business Magazines in China     

Zhang  Bohai 《Publishing Research Quarterly》2008,24(1):54-58

Business-to-Business (B2B) publications actually have a long history in China, beginning in the early twentieth century. After 1949, the Chinese economy became planned and regulated by the government, the former B2B magazines became their purpose to explain the government’s industrial policies, chart business direction and exchange developmental experience. As China began its reform and opened to a market economy in the 1980s, traditional published B2B magazines began to reappear. Today almost 3,000 B2B magazines provide information about specific industries and services.  相似文献   

从AIDS蔓延四种新动态谈大学生的预防措施     

蒋沁蓓 《鄂州大学学报》2007,14(5):53-56

艾滋病全球化使其蔓延出现了4种新动态:一是由高危人群向一般人群扩散;二是低龄化(2006年全球新增HIV携带者中40%为15岁至24岁的年轻人);三是经性途径和注射吸毒途径传播的人数急速飙升(在我国2005年新发生的感染者中,分别占49.8%和48.6%);四是相当多的感染者尚未被发现。这些新动态向我们提出了一个既无法回避又迫在眉睫的新课题——大学生如何防范艾滋病的袭击,怎样在大学校园共筑预防艾滋病的铜墙铁壁。该文就这一课题提出了一些针对性、操作性、适用性较强的应对措施。  相似文献   

基于Web的媒体信息资源管理系统的设计与实现   总被引：1，自引：0，他引：1  

马海燕 《台州学院学报》2004,26(6):25-27,30

运用J2EE的技术与数据库技术的结合，阐述了媒体信息管理系统的总结构、数据库结构、关键技术。设计与实现了易查询、易维护、可移植的管理系统。从而有效提高了媒体信息资源的共享与分布操作。  相似文献   

Rn中向量的正交化     

靳廷昌 《河北北方学院学报(社会科学版)》2003,19(3):12-14

利用矩阵的第三种到初等变换,把R~n中任意一组线性无关的向量组化为正交组。  相似文献   

Mini-research Experience in Simple Linear Regression     

Paul Isihara  Elisabeth Congdon  Terry Perciante 《PRIMUS》2018,28(7):699-716

Within the undergraduate mathematics curriculum, the topic of simple least-squares linear regression is often first encountered in multi-variable calculus where the line of best fit is obtained by using partial derivatives to find the slope and y-intercept of the line that minimizes the residual sum of squares. A markedly different approach from linear algebra, which could also be introduced in multi-variable calculus, obtains the regression line by vector projection. The latter viewpoint offers elegant proof of the equation relating the total, explained and unexplained variations. Consideration of data with the same regression line and correlation opens the door for a “mini-research experience” (MRE). A sequel MRE gives rise to an open Research Experience for Undergraduates topic to analyze reflection sequences and a fundamental connection between complex analysis and regression analysis. A few general guidelines and basic goals for MREs are included for those whose main interest is in undergraduate research.  相似文献