Research On Theory And Methods In Group Decision Making Based On Linguistic Information

The group decision-making is a kind of process, in which under some decision criteria the members’preference in the group are aggregated into single preference. There are more and more decisions needed to be made by group in working environment now, with the development of IT technology and economic globalization, and then, the way of group decision-making is benefit for us:the wider range of knowledge and experience, the more diverse perspective, the potential behavior of collaboration etc. In recent years, the group decision-making theory and study of method has been extensive attention of scholars at home and abroad, there are many results about it. However, it should be pointed out that there are some new challenges about researching on group decision-making. In the actual group decision-making process, the group decision-making is facing many new problems, because each expert has different views and perspectives about some complex problems, the perception of members in the group is different about some complex problems, and that is affected by each member’s knowledge structure, judgment level, individual preferences and uncertainty of information and many other factors. So, the decision-making under uncertain environment, aggregation of group decision and the judgment of expert level are two very important issues. Now, the study has raised the attention of scholars, but the theory and method are still immature. In this paper, the theory and method are studied about group decision-making based on linguistic information and the assessment level of experts based on uncertain information. Main tasks are summarized below:(1) Direct to the consistency of linguistic judgment matrices, the concept and discrimination method of additive complete consistency and multiplicative complete consistency of linguistic judgment matrices, the discrimination method of the satisfactory consistency, alternatives ranking, and regulating consistency is provided.(2) Direct to the group decision making on linguistic judgment matrices, the method of two-tuple linguistic and transfer function for dealing with the group decision making on linguistic judgment matrices and multi-granularity linguistic judgment matrices is provided.(3) Direct to the group decision making on linguistic decision matrices, two method of dealing with the problem on LOWA,IOWA operator and the transfer function are given, as well as the method of two-tuple linguistic for the group decision making of multi-granularity interval linguistic judgment decision problem. (4) Direct to the method of assessment level of experts on uncertain information, the method of assessment level judgment of experts in group decision on complementary comparison matrix, linguistic judgment matrix,vague information decision matrix, interval number information decision matrix and uncertain information in different forms is provided.At last, the research results and conclusions are summarized in this paper, and the main contribution of this thesis, the theoretical value and application value are generalized. Meanwhile, the limitations of this thesis and the follow-up suggestions of the study are pointed.