document: PVA : a self-adaptive personal view agent system In this paper , we present PVA , an adaptive personal view information agent system to track , learn and manage , user 's interests in Internet documents . When user 's interests change , PVA , in not only the contents , but also in the structure of user profile , is modified to adapt to the changes . Experimental results show that modulating the structure of user profile does increase the accuracy of personalization systems .
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