智能控制智能控制智能控制 (8).pdf

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1、IntroductionExpert systems have been one of the most emphasized areas in the field of AI during the past decades.An expert system can handle real-world complex problems by using a computer model of human expert reasoning,to reach the same conclusions that the human expert would do.DefinitionFeigenba

2、um,a pioneer in the field of expert systems,defined an expert system as an intelligent computer program that uses knowledge and inference procedures to solve problems that are difficult enough to require significant human expertise for their solutions.FeigenbaumPerformanceAn expert system is an inte

3、lligent computer program can perform special and difficult tasks in some fields at the level of human experts.The fundamental function of the expert system depends upon its knowledge,and also called knowledge-based system.Feature of Expert SystemsComparing with traditional programs,the expert system

4、s possess the following features:Heuristic01Transparency02Symbolicoperation04Flexibility03Reasoning with uncertainty05Feature of Expert SystemsHeuristic The expert system utilizes and combines the heuristic knowledge,simulates the thinking and cognitive process of experts.The expert system can perfo

5、rm high-class analysis and inferences to solve complex or difficult problems.Feature of Expert SystemsTransparency Expert system utilizes knowledge applied and middle results generated during the problem-solving process in the knowledge base.The reasonableness of the knowledge utilization in problem

6、-solving process can be examined.Feature of Expert SystemsFlexibility The expert system can add new knowledge,revise and refresh original ones.An ability to extend and enrichthe knowledge base,and improve the system performance.Feature of Expert SystemsSymbolic operation The expert systems use symbo

7、lsto represent knowledge,set ofsymbols to represent concept ofproblems.The expert systems emphasize uponsymbolicprocessingratherthannumerical computation.Feature of Expert SystemsReasoning with uncertainty The expert systems can integrate and utilize the fuzzy and uncertain information and knowledge to make inference.The method for solving problems by domain experts is mostly experimental.Summary Definition of Expert System Features Heuristic Transparency Flexibility Symbolic operation Reasoning with uncertainty