The spatial pattern evolution and driving mechanism of the directed network of technological cooperation in the Yangtze River Delta
Building a directed network of urban technological cooperation and identifying the unequal potential and competing relationship of urban innovation network are key indicators to understand the urban innovation hub and the remodeling of innovation network.This paper constructs a weighted urban technical cooperation network based on the directional characteristics of technical cooperation.Taking the field of biomedicine as an example,it depicts the spatial pattern of the urban technical cooperation network in the Yangtze River Delta(YRD),and analyzes the multi-dimensional power mechanism of the network evolution using the dynamic exponential random graph model.The results showed that:(1)The biomedical technology cooperation network of the YRD presented a"1+3+N"evolution model,formed a core-periphery structure under the leadership of Shanghai and the three provincial capitals(Nanjing,Hangzhou and Hefei),and presented significant provincial differences and weak inter-provincial coordination.(2)The evolution process of the biomedical technology cooperation network in the YRD has typical structure and time dependence characteristics,which is reflected in the development of the binary reciprocity relationship and the closure of the ternary structure hole,and presents the structure dependence characteristics in time sequence.(3)The level of economic development,administrative level and innovation capacity promote the expansion of cities'network connections.The geographical proximity,organizational proximity and technological proximity between cities promote the formation of inter-city technical cooperation relations.(4)Reciprocity,transitive closure,incoming closure and relationship expansion of non-core nodes of the network are the structural dynamics of the evolution of the biomedical technology cooperation network in the YRD.The evolution of the network has significant auto-regression,that is,the node connection is stable in time sequence.This paper defines the construction method of the directed weighted network of urban technical cooperation,and systematically reveals the structural dynamics of the evolution of urban technical cooperation network by using the dynamic exponential random graph model.This article systematically improves the understanding of the structural mechanism of the evolution of inter-city technology cooperation networks,and can provide empirical and theoretical support for accelerating the construction of regional collaborative innovation systems,and thus provides some relevant policy recommendations.
inter-city technical cooperation networkdirected networkYangtze River Deltabiomedical technologydynamic exponential random graph model
万方数据
维普
