According to the equipment fault and line fault that exist in power systems,a componentized inference engine which combines forward inference and backward inference is designed based on the analysis of the categories and characteristics of the fault in this paper.

The components of the software model include a dynamic generator,a dynamic allocator and an inference engine.

Design on reasoning engine of mine fan fault diagnosis expert system;

It noticeably increases the efficiency of reasoning engine.

The framework makes use of the characteristics of concept of norms,rich semantic and level relations of the Ontologe and combines the knowledge warehouse of Ontologe and the first-order predicate reasoning engine on the user\'s query to process the result and make users get ultimately information that matchs with search requests in a higher state.

,the offline subsystem,including data preparation and URL clustering based on user s browsing paths,and the online subsystem,including a recommendation engine and a Web HTTP server.

It proposes a design plan to implement the recommendation engine using association rules in the end.

With schema mapper, a semi-automatic tool is demonstrated for schema integration that combines a novel visual interface with an algorithm-based recommendation engine to cope with such a challenging problem.