Developing a more scientific COVID-19 response strategy has become hot topic today. By sorting out large amount of data, this paper predicts the spread law epidemic in Shanghai, Beijing, and Changchun May, summarizing key factors related to human immunity, using tool process fitting obtaining outbreak three cities under epidemic, establishing SIR Infectious disease model. The development situat...

Risk propagation is occurring as an exceptional challenge to supply chain management. Identifying which supplier has the greater possibility of interruptions pivotal for managing occurrence these risks, have a significant impact on chain. and predicting how risks propagate understanding dynamically diffuse if control strategies are installed can help better manage risks. Drawing complex systems...