2.1 Components of an Expert Sys- tem A typical expert system consists of four compo- nents: knowledge base, user interface, working memory and inference engine. The user interface acts as a pre-processing sys- tem that performs syntactic and semantic anal- ysis on user input. The relevant information is extracted and stored in the working memory.
The user interface corresponds to the sensory and responding system in the human cognition process. Ideally, it should involve understand- ing natural language and even machine percep- tion. However, the research on natural language understanding and computer perception has not progressed enough to achieve such goals. Most expert systems today use a higher level language to interact with users. The knowledge base of an expert system re- sembles the permanent memory of an human ex- pert. Domain-specific knowledge is placed there. This knowledge base is used by the inference en- gine to derive conclusions or solutions to the problems. The inference engine resembles the thinking part of human cognition process. It mainly directs the flows of information and per- forms reasoning based on the working memory. the knowledge base and the external environ- ment. The inference engine interprets the facts of the working memory, applies the knowledge in the knowledge base to construct plans and to solve problems. In the expert system development, our focus is the three main issues: knowledge acquisition ~ knowledge representation, and utilisation of the knowledge.
2.1 Components of an Expert Sys- tem A typical expert system consists of four compo- nents: knowledge base, user interface, working memory and inference engine. The user interface acts as a pre-processing sys- tem that performs syntactic and semantic anal- ysis on user input. The relevant information is extracted and stored in the working memory. The user interface corresponds to the sensory and responding system in the human cognition process. Ideally, it should involve understand- ing natural language and even machine percep- tion. However, the research on natural language understanding and computer perception has not progressed enough to achieve such goals. Most expert systems today use a higher level language to interact with users. The knowledge base of an expert system re- sembles the permanent memory of an human ex- pert. Domain-specific knowledge is placed there. This knowledge base is used by the inference en- gine to derive conclusions or solutions to the problems. The inference engine resembles the thinking part of human cognition process. It mainly directs the flows of information and per- forms reasoning based on the working memory. the knowledge base and the external environ- ment. The inference engine interprets the facts of the working memory, applies the knowledge in the knowledge base to construct plans and to solve problems. In the expert system development, our focus is the three main issues: knowledge acquisition ~ knowledge representation, and utilisation of the knowledge.
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