Research On The Diffusion And Control Of Social Network Public Opinion Of Emergencies

With the occurrence of emergency events, it endangers the safety of life and property of the people and the social stability of the country. In the context of the new media era, the impact of emergency events will not be limited to region. The impact of the depth, breadth is also dramatically expanded. Emergency public opinion will rely on the network as a communication channel, refract of public opinion and reflect the demands of the reality. The social network public opinion is easy to cause collective network solidarity, curse mutual network and seek truth. It will give society and government pressure and even derive from the reality of mass emergency events and other dangerous behavior. It is important to strengthen the analysis, supervision and control of social network public opinion, which can effectively curb the spread of public opinion, prevent deriving from the emergency events and weaken the negative impact of unexpected events.At first, the paper summarizes the research status of social network public opinion diffusion and introduces the related theory of social network public opinion diffusion.Secondly, the article is according to the characteristics of social network public opinion diffusion. It considers the influence of the government and the public media to the social network public opinion and establishes a kind of social network public opinion diffusion model. The paper defines and analysis of the turning point of the social network’s public opinion spreading trend. At the same time, it gives and proves the existence of turning points and the trend of public opinion diffusion in different public opinion diffusion measures. Using the theorem of the conclusion, the state of different groups in the process of public opinion diffusion is simulated and the influence of diffusion measures on the diffusion of public opinion is further analyzed.Once more, the paper is based on the Pontryagin maximum principle and it uses auxiliary variables to solve the optimal control model on the diffusion model. The article gives a kind of optimal control objective function, takes advantage of the measure of public opinion diffusion of key factors and infer to the minimum public opinion diffusion control method which is for the objective function value. Finally, the validity and practicability of the model and control method are illustrated by numerical simulation.Finally, through the analysis of the Tianjin bombings event, the social network public opinion diffusion is empirically studied and the influence of diffusion measure on the diffusion of public opinion is analyzed. The influence of external control on the public opinion and the status of the participating diffusion groups are analyzed. It has verified the feasibility and effectiveness of the public opinion diffusion and control conclusion, which provides a good theoretical basis and reference for improving the government correct and quick response to the emergency vents.