Domain NLU Time Information And Its Application On Requirement Analysis Of Mechanical Products Design

The application of semantic analysis of NLU to products design is introduced and time information understanding in NLU system is emphasized in this paper. The time information understanding expressed in natural language is analyzed and transformed into the requirements of conceptual design,by which the sequent design is supported.Firstly, the ontology and theory CD theory are chosen to the method based-on knowledge, by the analysis of current semantic analysis methods, combined with the character of NLU system,and advantages of which are discussed in detail. Secondly, Nouns and adverbs that expression of the time which are related with collective structure are sorted and introduced,then a corresponding model is given, in addition grammer expression of time information in discourse is discussed; and a methods of time information of discourse understanding in NLU are introduced. Thirdly, It is done that the establishment of semantic model on the basis of time information understanding in NLU and knowledge base. The regulation of time information understanding is crystallized to the degree of realization. By which, the program applies to the domain NLU,the comparison of time nouns by time semantic analysis and understanding of time adverbs are completed preliminary.At last, the application of time information understanding in NLU to the requirement analysis of archetype in mechanical products design is achieved. Being programmed and debugged, the system is in operation.