The Answer Extraction In Chinese Question Answering System In The Restricted Domain

Question answering system which provides the human-computer interface by means of natural language is more accurate,simply and efficiency than the traditional search engine which is based on keyword,has a very wide range of applications,is a hot and difficult issue of current research.Due to the complexity of natural language processing people researchs it in a restricted domain,which makes restricted domain Chinese question answering system become the hot of domestic research.The real-time and Accuracy of the answer make a decision to the performance of the restricted domain Chinese question answering system,so the answer extraction become an important research topic.This paper does a certain amount of study on the key technology of restricted domain,such as how to access lots of domain real-time information from the existing network,how to access the most relevant information from a lot of domain information,how to positioning the accurate answer.The main innovative achievements are as follows:(1)This paper puts forward a method of constructing domain knowledge Base.This method with the help of ontology ideas,uses the domain concept and domain ontology from the domain corpus by the method of dynamically acquiring domain words,which is based on the large domain corpus,then describe them by the method of the description of the HowNet's concept,finally constructs the domain knowledge base.It provides a more effective resource for the study of domain issue.(2)A method of domain text retrieval is put forward in this paper.With the help of domain characteristics and modern search engine technology,the method constructs the domain search engine system which has accessed lots of domain text resource.(3)A method of domain passage retrieval is put forward in this paper.This method makes use of commonpassage retrieval mind in the restricted domain question answering system,and improves the MuliText passage retrieval method according to domain knowledge to adapt to the restricted domain.It provided accurate domain paragraphs resources for the answer extraction.(4)This paper puts forward a domain answer extracting method.Aimming at domain issue,the method has formed a whole method to extract the answers of common questions. The extracting results indicate that the method has good impact in the resolve of domain questions.(5)Take Yunnan tourism as the restricted domain to construct Yunnan tourism knowledge base,then realize the text retrieval,passage retrieval and answer extraction,at last the design and implementation of the prototype system of Yunnan tourism answering system is provided.