Research On Viewpoint Polarization In Social Networks Based On Probability And Threshold Rules

With the rapid development of the Internet,it is more convenient for people to obtain information and socialize online,but more closed and solidified in terms of social cognition and information identification.This trend accelerates the polarization process of group views,which is not conducive to individual growth and social development.Therefore,it is of great practical significance to explore the evolutionary mechanism behind group views.The study of group viewpoint polarization can enrich the research scope of viewpoint dynamics,so it also has high scientific value.This thesis pays attention to the fact that there are two stages with different characteristics from the germination to the steady-state of group views,so it takes a phased approach to study the polarization phenomenon of group views.First,at the generation stage of group views,this thesis draws on the previous research paradigm of designing dynamics mechanism based on probabilistic rules.In consideration of the actual scene,that is,the competition relationship that attracts fans actually exists at the beginning of the generation of binary views,this thesis proposes the generation model of group views under the binary competition mechanism.In order to explore the phenomenon of group viewpoint polarization under this model,this thesis has carried out both numerical simulation experiment and theoretical analysis.Based on the mutual verification of the two,we get several conclusions about the polarization of group views under this model: first,the initial proportion and scale of the binary views greatly affect the degree of group opinion polarization;Second,in the process of the change of the degree of polarization of group views,the audience size of the dual view shows a linear change.No matter which viewpoint in the binary viewpoint,its change slope is equal to the initial moment and its initial scale is the proportion of all audiences of the binary viewpoint.In addition,although it has not been verified with theoretical analysis,the simulation results reveal the influence of social network structure differences on group viewpoint polarization,which also brings enlightenment for the subsequent research on the evolution stage of group viewpoint.Then,in the evolution stage of group views,inspired by the research in the generation stage and combined with the actual life scene,this thesis focuses on the differences between different social network structures and conservative degrees of different social groups.On this basis,following the popular paradigm of dynamic model design based on threshold rules,this thesis builds an evolutionary model of group views around the perceived bias and the updating threshold representing the degree of group conservatism.Based on the above model,this thesis solves the theoretical results of steady-state evolution of group viewpoint and the phase transition point of the group viewpoint uniformly to the polarization state,and verifies with the results of numerical simulation,finally draws several conclusions about the group viewpoint polarization under this model: Firstly,the stable state of group views is susceptible to perception bias,and the higher the perception bias is,the more easily the group views reach the polarization state.Secondly,the renewal threshold is also a factor affecting the steady-state of group views.The higher the renewal threshold is,the more likely the polarization state will occur when the group views converge.Thirdly,under the influence of the initial ratio of perception bias to positive views,the phase transition point of group consensus to polarization can be adjusted.The research conclusion of this thesis on group polarization,combined with the actual scene,can have a certain guiding role,so it has practical significance.In addition,the method of stage study of group viewpoint can enrich the research paradigm of viewpoint dynamics.The viewpoint dynamics model in the two stages also provides new research ideas for the latecomers.Therefore,this thesis also has theoretical significance.