The Research On Multi-Agent System Theory And Application

Agent theory and technique, especially multi-agent theory and technique, provide a new approach to the analysis, design, and implementatoin of open and distributed systems. That is called an important breakthrough of the software developping. For current multi-agents theory escape from the actual problem, this thesis research relations of the agent mental state, bring up the agent mental model, cooperation and communication approach to guide engineering application. Using the theory, we have established an open distributed expert system. This thesis is focused on the research of multi-agent theory and application,which include five part of contents: In section 1, introductoin;in section 2 ,we Analysis the problem and present condition of Agent research, point out the agent theories and technique development trend;in section 3,we provide an agent mental model with utility;in section 4,we give a method of communication based on MCU model;insection 5;in section 6 we present a cooperation and oganization method of multi-agent systems;in section 7, we give some conclusions and direction for future research. The importants innovation of this thesis includes these contents:(1) Using none standard modal logic as formal tool, we research Agent and MAS model, and formally define the belief, intention, plan, worth concept of income etc., and extend the Belief into knowledge belief and achievement belief.Knowledge belief is knowledge of an Agent, it presents evolving and inheriting characteristic. Achievement belief is an event which can be established in the future, and is aware of personality or goal.Useing non standard world of the modal logic describe two kinds of Beliefs, Possible world is a state that Agent can attain or realize, it can avoid the logical omniscience problem and the logical side effect problem.(2) we present a semantic model combined with utility. On the language to present the parameter used in decise and On the semantic to present two functions of utility and cost between two worlds which be transferred by performing plan,. the problem has been solved that mental model can not make decision of activity. We Announce reason that goal and intention produce. Goal is state of that an agent can appear on in the current world. Intention is a goal which has maximum utility in thecurrent world.. (3) We present MCU mental model. Compared with other model, the model overcame the problem that mental concept relation is not enough clear. There is evolving characteristic in the model. Unifing the utility reasonableness and the logic reasonableness in a model, the utility reasonableness is a worth of agent, so agent calculation have the social. The model can be easy used in MAS design and analysis. We present the expanding rule of mental state.(4) We present the communication language model based on the MCU,and explain the semantic of model,and appear the evolve rule.Compared with others, the rule and communication language make cooperation of MAS adaptting to open environment.(5) We present cooperative planning based on contract net protocol. It overcome that biders lack the task decompositing knowledge in the contract net protocol and judge that a plan can be worked using inherent knowledge in the cooperation planning system.(6) We have designed the distributed vehical expert system based on telemetring. Since there are many types in the telemeter data, and processing mathods are complex, we design the frame combined with rule,model,. For positioning accuracy and extending the estimate of fault result, we establish the fault graph diagnosis and predict model. using the MCU modelof we establish the expert nodes, use the communication language and the evolving rule and cooperation model to establish the distributed vehical expert system based on telemetring. Compared with other systems, it has strong abilityof positioning fault, robust characteristics, expandable characteristics, and adapts to opening environment.