New consensus reaching process with minimum adjustment and feedback mechanism for large-scale group decision making problems under social trust networks

Large-scale group decision making problems in social networks environment have become an important research topic in decision making science. In this paper, we propose a new consensus reaching process with minimum adjustment and feedback mechanism considering public opinions for large-scale group decision making problems under social trust networks. The trust propagation operator based on Archimedean t -norm is used to calculate incomplete trust values first. The fast unfolding algorithm is used to divide experts into subgroups. The opinion evolution model is presented to calculate experts' weights based on dynamic trust values and expert influence. Public opinions are used to determine consensus thresholds of attributes. A dualpath adjustment model is developed for group consensus in social network. Divide experts' evaluation values into three different types: 'conflict behavior', 'tolerant behavior', 'trust behavior'. Minimum cost adjustment models have been developed considering adjustment directions for the 'conflict behavior' and interactive path is activated for the 'tolerant behavior'. The drugs selection from E -commerce platform for therapy of influenza at home is used to illustrate the new method and comparisons have also been conducted.