Читать книгу Intelligent Data Analytics for Terror Threat Prediction - Группа авторов - Страница 37

SI model is one of the oldest epidemic models where S stands for susceptible and I for infected. Initially, for complex networks SI model was proposed by Ref. [12]. If complex networks use SI model then state of nodes is either susceptible or infected. Once a node is infected it could remain in same state throughout life as shown in Figure 1.8. But this model is not practical. There is little chance that a susceptible infected node can be recovered and again in future. In social networks once rumor is received by any user, he/she believes it at that particular time and in the future they may know the truth and recover from it, which is not possible in SI model. The models SIS, SIR and SIRS deal with this issue and these models are discussed in the succeeding sections.

Figure 1.8 SI model.