Research On User Preference Modeling Based On Description Logic

With the development of the Internet, people have entered the information age. The resources and information on the Internet grow faster. Although the information riches people's life, it brings some problems to the people who use the Internet. Too much information makes it difficult for people to find the information they need accurately. User requirements are diverse, but the search engine cannot provide personalized services for users. Therefore, how to understand users'needs and provide personalized services has become a big problem.User model plays an important role on the personalized service field. The service needs to be modeled firstly, and then provide different services for different users. The traditional user models mostly use keywords to represent user's interest. The form of expression of this method is too simple and considers the relation between concepts' little. Description logic is the representation of knowledge based on object which has good ability of expression and decidability. Description logic can make the connection of semantic among the concepts in knowledge base and use the ability of reasoning to reason the knowledge in description logic base.To resolve the problem referred above, this thesis investigates user preference modeling based on description logic (DL). Considering the advantage of expression ability of description logic, the preference is expressed by description logic. The construction and content of preference based on DL is illustrated and analyzed. The form of expression of user preference model is given which is the frame of model. After that, the user preference model is constructed and updated. Description logic has the ability of reasoning. Using the ability of reasoning and the relation of concepts, the model is analyzed from three points which contain the consistent of knowledge base, acquisition of knowledge and optimization of expression. According to the method in this paper, the example is given to illustrate the procedure of modeling and proof the feasibility of the modeling method which has three parts that contain the construction of model, update of preference and reasoning of preference.