| Cooperation is the basic organizational form of innovation activities,and the enterprise cooperation network plays an important role in the process of technological innovation.However,the effect of the enterprise cooperation network depends to a certain extent on whether the enterprise is in the center of the cooperative network,that is,the centrality of the enterprise cooperation network.Therefore,how to improve the centrality of the enterprise cooperation network and what factors affect it have become a common concern of scholars and enterprises.The research of knowledge management believes that knowledge,as an important foundation for enterprise innovation,gives enterprises important individual characteristics and structural characteristics,and thus affects the initiative of enterprises to seek partners and the attractiveness of potential partners,which also affects the cooperative relationship of enterprises and their results-the centrality of enterprise cooperation networks.In order to analyze this problem,this study uses knowledge diversity to measure the knowledge stock of enterprises based on the concept of knowledge base,introduces the macro structure perspective of enterprises according to the theory of resource dependence,describes the macro network structure of enterprises based on social network theory,that is,constructs knowledge co-existence network and enterprise-knowledge binary network according to the relationship between enterprises and knowledge elements,and introduces two network structures: knowledge co-occurrence network centrality and enterprise-knowledge binary network centrality.Finally,from the perspective of enterprise initiative and attractiveness,a comprehensive analysis framework is constructed for the centrality of knowledge diversity,knowledge co-occurrence network and enterprise-knowledge binary mode network centrality on the centrality of enterprise cooperation network.The study provides a reference for enterprises on how to carry out knowledge management,balance their own knowledge structure and knowledge diversity,and change the centrality of their own enterprise cooperation network.Finally,the sample of this paper was taken from the Chinese patent data of 161 Chinese listed companies in the pharmaceutical manufacturing industry from 2007 to 2020,the empirical test was conducted by the Exponential Random Graph Model(ERGM),and the following main conclusions were obtained.(1)The centrality of the enterprise cooperation network is enhanced with the improvement of the knowledge diversity of the enterprise.Because the improvement of knowledge diversity increases the efficiency of enterprise knowledge search and reorganization,reduces the communication cost of enterprises,not only enhances the attractiveness of enterprises to potential partners,but also enables enterprises to maintain the initiative of seeking partners.(2)The centrality of the enterprise-knowledge binary network amplifies the positive impact of knowledge diversity on the centrality of the enterprise cooperation network.The high centrality of the enterprise-knowledge binary network means that enterprises are integrated into certain knowledge clusters,which further improves the knowledge search efficiency of enterprises and reduces the communication costs and innovation risks of enterprises.Thereby increasing the initiative and attractiveness of focus enterprises,helping enterprises to establish cooperative relations and enhance the centrality of cooperation networks.(3)The centrality of the knowledge co-occurrence network weakens the positive relationship between knowledge diversity and the centrality of the enterprise cooperation network.Because the low centrality of the knowledge co-occurrence network means that there are more opportunities for the combination of knowledge elements in the future,which provides a direction for future innovation of enterprises,and also encourages enterprises to take the initiative to search for knowledge.Therefore,it is conducive to the establishment of cooperative relations by enterprises to enhance the centrality of enterprise cooperation. |