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Study on Measuring Diffusion Speed of Scientific Knowledge Based on Citation Network

Wang Liang;Zhang Qingpu;Yu Guang;Zhao Limei;School of Management Harbin Institute of Technology;School of Information Management,Heilongjiang University;  
Knowledge diffusion speed has important influence to knowledge innovation efficiency,especially in the field of science and technology.This paper analyzes knowledge diffusion process and the connotation of knowledge diffusion speed and uses citation network as a model to describe the mechanism of knowledge diffusion.Combining with the characteristics of citation,the topology parameters of citation network are defined.By assigning citation lag as the weight of edges,the citation network becomes a sequential network.On this basis,this paper embarks from the citation network topology structure,establishes the knowledge diffusion speed measurement index from integral perspective and individual perspective with empirical research.Results show that integral knowledge diffusion speed measurement index can reflect the development speed and tendency of a research topic,while individual knowledge diffusion speed measurement indicator can reflect contribution of a certain paper to the development of the research topic.This paper provides a new train of thought for the objective and reasonable evaluation of a research topic's evolution process and a scientific paper's value.
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