话题跟踪是一项针对新闻话题进行相关信息识别、挖掘和自组织的研究课题,其关键问题之一是如何建立符合话题形态的统计模型.话题形态的研究涉及两个问题,其一是话题的结构特性,其二是话题变形.对比分析了现有词包式、层次树式和链式这3...话题跟踪是一项针对新闻话题进行相关信息识别、挖掘和自组织的研究课题,其关键问题之一是如何建立符合话题形态的统计模型.话题形态的研究涉及两个问题,其一是话题的结构特性,其二是话题变形.对比分析了现有词包式、层次树式和链式这3类主流话题模型的形态特征,尤其深入探讨了静态和动态话题模型拟合话题脉络的优势和劣势,并提出一种基于特征重叠比的核捕捉衰减评价策略,专门用于衡量静态和动态话题模型追踪话题发展趋势的能力.在此基础上,分别给出突发式增量式学习方法和时序事件链的更新算法,借以提高动态话题模型的核捕捉性能.实验基于国际标准评测语料TDT4,采用NIST(National Institute of Standards and Technology)提出的最小检测错误权衡系数评测法,并结合所提出的核捕捉衰减评价方法,对各类主要话题模型进行测试.实验结果显示,结构化的动态话题模型具有最佳的跟踪性能,且突发式增量式学习和时序事件链的更新算法分别给予动态话题模型0.4%和3.3%的性能改进.展开更多
本文基于文献分析法,研究揭示物理-事理-人理系统方法论(WSR方法论)的演化发展及其影响。以Web of Knowledge、知网和谷歌学术为数据源,检索1995—2018年的WSR方法论的研究文献,划分WSR方法论发展的主要阶段;基于复杂网络和动态主题模...本文基于文献分析法,研究揭示物理-事理-人理系统方法论(WSR方法论)的演化发展及其影响。以Web of Knowledge、知网和谷歌学术为数据源,检索1995—2018年的WSR方法论的研究文献,划分WSR方法论发展的主要阶段;基于复杂网络和动态主题模型等方法,分析WSR方法论文献信息,挖掘WSR方法论的主要学者和机构、研究内容的演化趋势;统计文献所属国家和领域等信息,分析WSR方法论对我国系统科学与工程发展的影响。研究结果显示:WSR方法论促进了我国系统科学与工程的发展,提升了其国际影响;WSR方法论经历了从理论研究到实践应用的发展过程;WSR方法论在系统评价、应急管理等领域得到了广泛应用,并呈现出多样化的研究趋势。展开更多
Many social events spread fast through the Internet and arouse wide community discussions. Those on-line public opinions emerge into diverse topics along the time. Moreover, the strength of the topics is fluctuating. ...Many social events spread fast through the Internet and arouse wide community discussions. Those on-line public opinions emerge into diverse topics along the time. Moreover, the strength of the topics is fluctuating. How to catch both primary topics and trend of topics over the shifting on-line discussions are not only of theoretical importance for scientific research, but also of practical importance for societal management especially in current China. To try the cutting-edge text analytic technologies to deal with unstructured on-line public opinions and provide support for social problem-solving in the big data era is worth an endeavour. This paper applies dynamic topic model （DTM） to explore the changing topics of new posts collected from Tianya Zatan Board of Tianya Club, the most influential Chinese BBS in China's Mainland. By analysis of the hot and cold terms trends, we catch the topics shift of main on-line concerns with illustrations of topics of school bus and environment in December of 2011. An algorithm is proposed to compute the strength fluctuation of each topic. With visualized analysis of the respective main topics in several months of 2012, some patterns of the topics fluctuation on the board are summarized.展开更多
文摘话题跟踪是一项针对新闻话题进行相关信息识别、挖掘和自组织的研究课题,其关键问题之一是如何建立符合话题形态的统计模型.话题形态的研究涉及两个问题,其一是话题的结构特性,其二是话题变形.对比分析了现有词包式、层次树式和链式这3类主流话题模型的形态特征,尤其深入探讨了静态和动态话题模型拟合话题脉络的优势和劣势,并提出一种基于特征重叠比的核捕捉衰减评价策略,专门用于衡量静态和动态话题模型追踪话题发展趋势的能力.在此基础上,分别给出突发式增量式学习方法和时序事件链的更新算法,借以提高动态话题模型的核捕捉性能.实验基于国际标准评测语料TDT4,采用NIST(National Institute of Standards and Technology)提出的最小检测错误权衡系数评测法,并结合所提出的核捕捉衰减评价方法,对各类主要话题模型进行测试.实验结果显示,结构化的动态话题模型具有最佳的跟踪性能,且突发式增量式学习和时序事件链的更新算法分别给予动态话题模型0.4%和3.3%的性能改进.
文摘本文基于文献分析法,研究揭示物理-事理-人理系统方法论(WSR方法论)的演化发展及其影响。以Web of Knowledge、知网和谷歌学术为数据源,检索1995—2018年的WSR方法论的研究文献,划分WSR方法论发展的主要阶段;基于复杂网络和动态主题模型等方法,分析WSR方法论文献信息,挖掘WSR方法论的主要学者和机构、研究内容的演化趋势;统计文献所属国家和领域等信息,分析WSR方法论对我国系统科学与工程发展的影响。研究结果显示:WSR方法论促进了我国系统科学与工程的发展,提升了其国际影响;WSR方法论经历了从理论研究到实践应用的发展过程;WSR方法论在系统评价、应急管理等领域得到了广泛应用,并呈现出多样化的研究趋势。
基金supported by National Basic Research Program of China under Grant No.2010CB731405National Natural Science Foundation of China under Grant No.71171187&71371107
文摘Many social events spread fast through the Internet and arouse wide community discussions. Those on-line public opinions emerge into diverse topics along the time. Moreover, the strength of the topics is fluctuating. How to catch both primary topics and trend of topics over the shifting on-line discussions are not only of theoretical importance for scientific research, but also of practical importance for societal management especially in current China. To try the cutting-edge text analytic technologies to deal with unstructured on-line public opinions and provide support for social problem-solving in the big data era is worth an endeavour. This paper applies dynamic topic model （DTM） to explore the changing topics of new posts collected from Tianya Zatan Board of Tianya Club, the most influential Chinese BBS in China's Mainland. By analysis of the hot and cold terms trends, we catch the topics shift of main on-line concerns with illustrations of topics of school bus and environment in December of 2011. An algorithm is proposed to compute the strength fluctuation of each topic. With visualized analysis of the respective main topics in several months of 2012, some patterns of the topics fluctuation on the board are summarized.
