社交网络中动态信任感知的观点演化模型

Dynamic trust⁃aware opinion evolution model in social networks

社交关系网络的复杂性和动态性为观点演化研究带来三大挑战:一是研究者在确定个体的观点交互集合时没有考虑个体的信任阈值,导致观点交互集合的准确性不足;二是现有研究通常忽略了非邻居节点之间的交互对社会群体观点演化的影响;三是现有研究通常基于个体间的观点距离来更新社交网络结构,没有考虑个体间的信任关系对网络结构的影响.为了应对上述挑战,提出一种社交网络中动态信任感知的观点演化模型(Dynamic Trust-Aware Opinion Evolution Model in Social Networks,DTAOE).具体地,首先基于信任传播规则构建出社交群体的信任矩阵;之后,基于引入的信任度阈值和信任矩阵,从邻居节点以及非邻居节点中确定当前个体的信任集合,进而基于信任集合中观点相似的个体更新当前个体的观点;最后,根据个体间的观点距离和信任关系,动态地调整社交网络的拓扑结构.上述演化步骤被重复执行直到群体的观点达到稳定状态.开展了大量的仿真实验,实验结果证明了DTAOE模型的有效性和合理性,并揭示了网络结构和信任关系对观点传播的影响机制.

The opinion evolution model plays an important role in simulating the process of dissemination and aggregation of social groups'opinions on major affairs.However,existing research usually updates the current individual's opinion based on neighbor nodes with similar opinions.In fact,individuals in social networks are more inclined to exchange opinions based on their trusted neighbor nodes.Secondly,previous studies do not consider the impact of interactions between non⁃neighbor nodes on the evolution of social group opinions.Moreover,current research usually updates the social network structure based on the opinion distance between individuals,without considering the influence of trust relationships between individuals on the network structure.In order to solve the above problems,this paper proposes a dynamic trust⁃aware opinion evolution model in social networks(DTAOE).Specifically,DTAOE first constructs the trust matrix of the social group based on the trust propagation rules.Then,based on the introduced trust degree threshold and trust matrix,DTAOE determines the trust individual set of the current individual from neighbor nodes and non⁃neighbor nodes,and updates the current individual's opinion based on individuals with similar opinions in the trust individual set.Finally,it dynamically adjusts the topology of the social network according to the opinion distance and trust relationship between individuals and repeats the above evolution steps until the opinions of the group reach a stable state.Through a large number of simulation experiments,the validity and rationality of the DTAOE model are verified,and the mechanism of the influence of network structure and trust relationship on opinion propagation is revealed.