Urban Distribution Resources Integration System Evolution Analysis And Evaluation

The distribution system is the important support for function of logistics system. With the deepening reform and the promoting of new urbanization in China, industrial restructuring and upgrading consumer continues to accelerate, modern modes of production, commercial and consumer consumption patterns will continue to change, the the scale of distribution requirements have expanded rapidly, and the tendency of diversification demand obviously, the construction and development of distribution system has aroused wide public concern. Under the background of the environmental pollution worsely, traffic pressure increased rapidly, and land prices continue increase, fully integrated distribution facilities, vehicles, equipment and other resources, improve the resource utilization, try to promote coordinated of distribution system with economy, environment, transportation system is the important way for transformation of the traditional mode.Therefore, study on urban distribution resources integration problems, clear distribution resources integration system evolution and dynamic mechanism, measure and evaluate integration level reasonable, will help to promote the coordinated development of distribution system and urban economy, environment, transportation and other systems..The main research work can be concluded as follows:(1) On the basis of literature research, the concept, connotation and characteristics of distribution resources are analyzed, and the causes of the integration of distribution resources are summarized. In accordance with the general principles of system theory, analyzed the structure of the distribution resources integration system, the system is divided into distribution resources supply and distribution resources needs two architectural system, clear the system with complexity, self-organization and dynamic characteristics, and determine the goal of system with three aspects:dynamic adaptation distribution requirements, enhance distribution resources efficiency and promote the coordinated development for distribution system among other systems.(2) Study on the distribution resource integration system self-organization evolution mechanism. The distribution resource integration system is an open system, with the characteristics of self-organizing systems, and nonlinear interaction relationship between system elements. In this paper, we use the game theory proved the existence of the self-organization emergence phenomena, and focus on the self organization evolution process of the system by using the method of entropy criterion and order parameter criterion. First, to establish the model of the entropy of the distribution resources integration system based on information entropy and the second law of thermodynamics, the entropy variable conditions and the entropy exchange were analyzed, and based on the Brusselator model to determine the system’s dissipative structure formation conditions and stability. Secondly, define the distribution resources integration system’s state parameter of two sub-systems, then using DEMATEL method to identificate the two order parameter in 17 state parameters:the distribution resources owner number and distribution services demand. Further, based on Logistic equations established the evolution model under the single order parameter and double order parameters, clear the distribution resources integration system evolution and characteristics.(3) Study on the dynamic mechanism of the distribution resources integration. For further study distribution resources integration system evolution process elements relationship and the external environment of the system, try to interpretate distribution resources integration which is a complicated, dynamic system, On consideration of the effects of exogenous variables and the assumed condition, clear the distribution resources supply and distribution resources needs two subsystems causal factors and the main feedback loop. Then further divided into 72 parameters, the system flow diagram and the structural equation is established with the help of the Vensim simulation tool, constructed distribution resources integration system dynamics model.(4) Study on the measurement and evaluation of the integration level of distribution resources. According to the system evaluation theory, around distribution resources integration system three target, integration level evaluation index system is established. Based on complex system coordinating degree (CSCD) model and the generalized regression neural network (GRNN) method, studied on distribution resources integration level measurement and evaluation, and using the MATLAB software, established CSCD-GRNN distribution resources integration level evaluation model based on basic data of Beijing, Shanghai, Guangzhou and other two urban with different characteristics, focused on solving the problem of the training sample output value determine. Evaluation model provides a reasonable method for comprehensively and objectively evaluate the distribution resource integration level.(5) Taking Beijing city as a case study. On the basis of theoretical research, taking Beijing City as an example to verify the distribution resources integration system dynamics model is effective. Study on Beijing city distribution resources integration with Vensim simulation model and policy simulation, and use CSCD-GRNN evaluation model to research Beijing 2005-2014 period of urban distribution resources integration level. Combined with case study, the specific recommendations to improve the efficiency of resources and improve the effectiveness of the system are given.In the research of this dissertation, based on self organization theory, system dynamics, artificial neural network theory and the application of methods, constructed the distribution resources integration system’s dissipative structure model, system evolution model, system dynamics model and distribution resources integration level evaluation model. Also taking Beijing as the case study specific object, the distribution resources integration system dynamics mechanism and the integration level were empirical research. It makes this dissertation innovative and instructive both in theory and practice.