The Characteristic Researches On The Evolution And Knowledge Diffusion Of Reaearch Themes

Research themes are the core of a research study to characterize the changing field of development. As science and technology and integration of the continuous cross, how to study the evolution of the subject to grasp the law of development is particularly important . From the perspective of bibliometric follow the life cycle, evolution and knowledge flow network of research themes, researchers tracked the development process of the research provides a new way of thinking and methods. To this end, we conduct the following two aspects:Firstly, this paper established of the evolution of the content of cluster analysis and information visualization methods of combining quantitative analysis, comparative analysis from the horizontal and vertical combing the two angles of a research topic of the dynamic evolution and life cycle changes, subject to a comprehensive longitudinal study of development. Visualization software citespace through information on the selection of the 1985-2011 sample of 5555 data processing literature, research topics obtained were cited clustering time series view, by word frequency - inverse document frequency algorithm for clustering analysis of the research themes identified in different research focus in evolutionary time by Curve Fitting Toolbox to study the life cycle curve fitting the theme, each comb from a longitudinal study of the evolution and development branch of the scale of change, life cycle theory based on the idea that the rise of the research branch, the development , mature and decline of the time for scientists to determine research topics and research to develop a reasonable plan to provide a scientific basis.Secondly, this paper analyzed the phenomenon of knowledge flows based on the spatial characteristics of research themes, including the knowledge of the subject input and output conditions. With the literature cited relationship between the definition of knowledge flows, and the subject and the object of knowledge diffusion, knowledge and direction of the flow path has defined the input and output of knowledge proposed measure indicators collected through the Web of Science 1985-2011 years of data samples citations and facilities cited literature data and the mapping of the citation distribution, the state, institutions, authors, disciplines, knowledge flow distribution were compared and found that different periods of knowledge flow patterns and the spread of intensity change. Meanwhile, cited by interdisciplinary comparative analysis of distribution patterns of subject knowledge theme the evolution of output and absorption patterns, the research topics that support the development of the subject changes, as well as find new growth point of discipline, and optimization of new interdisciplinary subjects layout provides a new way of thinking, thus creating a research topic to grasp the latest developments and new methods of research results.