Research On Group Decision Support System Based On Qualitative Reasoning Theory And Multi-Agent

Decision making is ubiquitous at all time. There exist lots of scientific decision problems in the process of economic and social development strategy making and macro-economy operation management. There also exist large amount of such problems in the process of enterprises' operation management and complex new products development, manufacture, operation and maintenance.The growing international competition under the rapid development of economy and society brings decision process randomicity, ambiguity, diversity, game playing and groupment, and requires higher scientificity for decision making. Therefore, group decision theories and methods for uncertain problems should be given intensive study.Aiming at qualitative group decision issue, this dissertation mainly discusses some basic academic problems in group decision making method and group decision support system based on qualitative reasoning, such as qualitative reasoning in group decision, group decision mechanism based on qualitative reasoning, result aggregation and process aggregation of group decision, and the architecture of qualitative reasoning group decision support system based on multi-agent, the structure of coordinators and the fusing policy of coordinators in group decision support system based on multi-agent. Taking conceptual design of car system as instance, the intelligent group decision support system of conceptual design is studied, and decision simulation process is introduced to the car modeling design system and an algorithm of decision simulation process is designed. The details are as follows.(1) The aggregation problems in group decision making are discussed based the analysis of qualitative reasoning theory, agent technology and group decision making methods.(2) Quantitative variables and qualitative variables integrated group decision making mode is discussed. A kind of processing procedure and method for complex qualitative group decision making based on qualitative reasoning is presented. The conversion method between qualitative variables and quantitative variables is discussed. The function of decision information resource bases consisting of database, model base, method base and knowledge base is analyzed. The decomposition of complex group decision problem and the coordination mechanism of problem solving procedure are also discussed.(3) Group decision making mechanism based on qualitative reasoning is discussed. A result aggregation method and a process aggregation method for group decision making based on qualitative reasoning are presented. An improved QSIM algorithm for result aggregation is designed via adding a judgment constraint and an assignment constraint. The influence rules of decision behavior of decision makers caused by outer circumstance and communication are described with qualitative state conversion relation, and an algorithm for communication process and evaluation process among decision makers in group decision making process aggregation is designed.(4) The function composition, operation mechanism and the coordination policy among agents of qualitative reasoning group decision support system based on multi-agent are discussed. A structure of group decision support system based on multi-agent is presented. The structure models of interaction agent, result aggregation agent, process agent and coordination agent are designed, and their operation process is also analyzed. .(5) Taking the conceptual design of car system as instance, the structure of the group decision support system for conceptual design based multi-agent is discussed. The composition of the decision information resources is described. A simulation model based on design structure matrix is constructed for modeling design of car system, and the corresponding simulation algorithm is designed. The execution time of modeling design of car system can be estimated via this simulation process. On the basis of modeling parts design idea, a basic frame of simulation system based on multi-agent for modeling design of car system is designed. The function of various agents in the simulation system is described. This simulation system can support the communication among designers and the formation of new schemes of modeling design effectively.