Abstract
In this COVID-19 epidemic, due to insufficient awareness of the impact of sudden public health emergencies on agricultural logistics at this stage, agricultural products were left unsold, stocks were backlogged, and losses were severe. In the process of distribution, we should not only ensure a short time cycle and avoid the contamination of agricultural products by foreign bacteria, but also pay attention to the waste of human, material, and financial resources. Therefore, this study mainly adopts the combination of the petrochemical network and block chain to build an agricultural products emergency logistics model. This paper first shows the operation mechanism of the petri dish network and blockchain coupling in the form of a graph and then uses the culture network modelling and simulation tool PIPE to directly verify the construction model. It is proved that the structure and overall business process of the agricultural products logistics system constructed by combining the Petri net and block chain are reasonable, reliable, and feasible in practical application and development. It is hoped that this study can provide a reference direction for agricultural emergency logistics.
Highlights
Agricultural logistics enterprises, logistics distribution centres, and wholesale markets should be organised to strengthen cooperation with production bases, leading enterprises and farmers' cooperatives to improve the efficiency of logistics and distribution
The use of blockchain technology and Petri network coupling mechanism to achieve information sharing and information symmetry has solved the problem of low transparency of logistics information as well as the problem of obstructed transportation, saving transportation time, and reducing losses
The Petri net modelling algorithm of the agricultural products emergency logistics process is as follows: 1) P or T is used to represent the events in the process, and the directed arc is used to represent the relationship between the events; 2) There is only one repository at the beginning and the end of the process; 3) The control structure is used to represent the path selection, and the control structure connects the corresponding P and T. 4) Change can be achieved through control structure
Summary
Agricultural logistics enterprises, logistics distribution centres, and wholesale markets should be organised to strengthen cooperation with production bases, leading enterprises and farmers' cooperatives to improve the efficiency of logistics and distribution. The application of blockchain technology in supply chain and logistics has achieved good results. In Petri net research areas: domestic and foreign research of the Petri net is mainly focused on the use of Petri net modelling to solve practical problems, especially in the area of logistics services and emergency management, effectively improving the efficiency of the model, providing a strong professional and formal description ability, convenient for hierarchical modelling and the stages of independent verification and validation. Jiang [7] introduced the Petri net modelling method to build a set of relatively perfect logistics product supply chain security traceability systems. Zhang et al [10] first applied the generalised stochastic Petri net model to quantitatively analyse the performance and operational efficiency of general emergency management workflow. Zhong et al [15] studied the urban emergency response system using the Petri net model and demonstrated the effectiveness of the model
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