关键词: 知识表示, 知识库系统, 可拓模型, 菱形求解策略, 可拓约束图, 条件可拓集合

Abstract: Aiming at the limitations of the existing knowledge representations in intelligent design, a novel Extension-based Knowledge Representation (EKR) was proposed. The definitions, grammar rules, and storage structure of EKR were presented. A Rhombus Solving Strategy (RSS) based on EKR was discussed in detail, including creation of the extension constraint graph, extended inference of matter-element, calculation of relevant functions, and generation of extension set. A knowledge base system based on EKR and RSS was developed, which was applied in turbine type selection in intelligent design. More reasonable results were obtained than traditional rule-based system. EKR was feasible in intelligent design to solve the limitations of traditional knowledge representations.

Key words: knowledge representation, knowledge base system, extension model, rhombus solving strategy, extension constraint graph, condition extension set