Model Of Domain Natural Language Text Categorization And Its Application On Requirement Analysis Of Mechanical

Presently the auxiliary designing technique of the computer designs for products mainly aimed at later stage, the support to its early stage is not enough. Based on the application of natural language understanding to product design, the Chinese text subordinate to user requirements, which expressed in natural language style, is understood and analyzed. With the whole system running, the results are conversed into the requirement of conceptual design to support the future design.There is an automatic text categorization module in the front part of the natural language processing system, so the part of behind carries on analysis in a narrow language righteousness environment. The meaning of that is obvious.First, related existing of model and arithmetic were Understood according to text originally the auto categorize of the function request. Compare their advantage well and it exist of shortage after, and combine various factor, a kind of text that establishes structure originally automatically categorize model was put forward. the model of the series-wound structure is constitute by three independent of text categorization machines according to different mechanism of opposite, and they are according to the concept , words frequency, and maximum entropy model respectively. Because of three kinds of usages that series-wound text categorization machines machine, the analytical result of the system was advanced .They have a certain connection again, using a classification a machine according to the phrase table according to the classification machine of the maximum entropy model of analytical then raised the utilization rate with information so as a result. Second, the system is applied in the need analysis of the machine product design according to combine concrete test realm. Furthermore clear face to the text of the realm to categorize how the mold piece integrate the system automatically originally. End, from the theories and the engineering angle, the text that elaborated to face to realm categorizes the advantage of the mold piece automatically originally, also pointing out the place of some shortage, and meeting in the research of difficulty.