Research On The Invulnerability Of Fresh Produce Cold Chain Logistics Network Based On Complex Network

With the development of society and the improvement of people's living standard,the demand and supply of fresh agricultural products are also increasing,and the cold chain logistics industry of fresh agricultural products has also obtained rapid development.However,compared with the developed countries,the cold chain logistics industry in our country starts late,there is no perfect cold chain logistics system and system,there are still some problems such as the bad circulation of commodities,the unsmooth transmission of information,the imperfection of logisticsinfrastructure,and so on.Therefore,how to build a model that can reflect the structure and development of the cold chain logistics network and optimize the cold chain logistics network has become a hot issue in academic research and analysis.Based on the complex network,this paper proposes a research model of cold chain logistics network for fresh agricultural products,which mainly studies the invulnerability of the cold chain logistics network through the complex network correlation model.The network model is simulated by Pajek and Matlab software.In the thesis,I verified the model's rationality by studying the node distribution and characteristic parameters of the box cold fresh chain logistics transportation network,and then I analyzed the damage resistance of the box cold fresh chain logistics transportation network.The research results and conclusions obtained in this paper mainly include the following aspects:(1)The paper analyzes the components of the cold chain logistics network,the network characteristics and the point-to-edge connection in the network.On this basis,this paper combines the scale-free network model based on complex network to improve the scale-free network model from the three aspects of the construction method,generation mechanism and connection preference of the cold chain logistics network.(2)Based on BA scale-free network model,the complex characteristics of cold chain logistics network are analyzed,and the integrated factors Fi are introduced into the original degree preference connection mechanism,and a new connection preference probability is established.According to the inverse probability p,the edges of the proportion of the existing logistics nodes to the lost nodes in the network are deleted.The results show that the improved model still accords with the characteristics of scale-free network model,and the degree distribution of network nodes is still in accordance with the exponential distribution of power ratio,which is related to the comprehensive factor Fiand the ratio coefficient 0(0<?<1).(3)According to the process of modeling and analyzing the cold chain logistics network of fresh agricultural products in this paper,the paper systematizes the cold chain logistics network of cartons by using Pajek software,and generates the corresponding network topology.By analyzing the degree distribution of nodes in the network,it can be seen that the node degree distribution of the box horse fresh cold chain logistics network is power law distribution,and the degree and degree distribution of the box horse fresh cold chain logistics network is analyzed.The characteristic parameters such as the average path length and clustering coefficient further verify that the carton Maxiansen cold chain logistics network conforms to the scale-free network feature.(4)Firstly,the paper analyzes the invulnerability of the box-chain fresh cold chain logistics transportation network.Through the two strategies of random attack and intentional attack on the nodes in the network,the simulation experiment of the box-free fresh cold chain logistics transportation network is carried out.The results show that deliberate attacks are more destructive to the network,and the largest nodes in the network will be vulnerable to network crash after being destroyed by the attack.At the same time,combined with random recovery strategy(RR),maximum degree reconnection strategy(DR),shortest path reconnection strategy(SR),shortest path-maximum degree strategy(SDR),The maximum degree and shortest path strategy(DSR)is used to restore and reconnect the network after being deliberately attacked.The change of network efficiency and(N)is analyzed by the simulation results.Find out the correlation between the characteristic parameters which limit the network function,study the network's invulnerability,and obtain the best repair strategy.