Improved SEIR viruses propagation model and the patch's impact on the propagation of the virus

According to the traditional SEIR model, combined with the virus real propagation situation, an improved SEIR viruses propagation model is proposed. Based on scale-free networks, we conduct simulation studies of the propagation process of the model; then analyze and verify patches programs of the system vulnerability used for the virus propagation, the impact on the virus propagation, and finally provide references for making better use of the patch programs to improve networks' immunization strategy for viruses.