Notice of RetractionPersonalized user's interest model study based on semantic relation tree

In order to improve the level of personalized service and enhance accuracy of search, it is necessary to build user model in e-learning system.This paper provided a user model expressed semantic relation tree. Algorithms for the vector space model and the least frequently used(LRU) introduced into the model were used to periodically update the co-adjustment model.Using the established model can effectively improve search accuracy,and the model can effectively support personalized service.The simulation test showed this model was effective.