Establish A Hierarchy Of User Interest Model

As the solutions of the problems, such as "information overload" and "information labyrinth", which are more and more serious to the ordinary users, intelligent information retrieval and personal information service have become the emphasis of the research of information service. Their foundations are to research how to apply the technologies of artificial intelligence to represent and organize the interest information, and how to build personalized user models, so that we can represent user's interest and information need clearly, and deal with the interaction between users and information retrieval systems intelligently.This thesis researches the method of building hierarchical user interest model. The hierarchical user interest model can represent a continuum of specific to general interests of a user. In some sense, more general interests correspond to longer-term interests, while more specific interests correspond to shorter-term interests. So, this representation of user interest model provides flexibility for its application. The main contributions of this thesis are listed as below:The representation of hierarchical user interest model. A hierarchical user interest model is a tree whose nodes are the single interest vectors.An algorithm of building hierarchical user interest model. User modeling is a dynamic process during user browsing the web. How to generate hierarchical user interest model is the emphasis of the algorithm.A method of pruning hierarchical user interest model (user interest tree). The nodes of user interest tree can't increase without limit. When the number of the nodes exceeds given count, we must prune the tree.The prototype system which is an implementation of hierarchical user interest modeling. It uses Chinese Web page as study object and can monitor the process of user browsing the web .On the base of processing and analyzing the content which users are browsing It builds user interest model.