%0 Journal Article %J Journal of Network and Computer Applications, Elsevier Science %D 2012 %T Enhancing Meta Portals using Dynamic User Context Personalization Techniques %A Christos Bouras %A Vassilis Poulopoulos %X The Internet is ooded with Information and the last decade its size has grown so many times that information search and presentation have become tedious tasks even for experienced users. Minor changes to existing resources can alter the situation and lead to major changes to the end user experi- ence. In this manuscript we present the dynamic web personalization and document grouping infrastructure for meta-portals and the evaluation of our mechanism on a meta-portal. A meta-portal is an informational node where articles from di erent sources are collected and presented in a categorized and personalized manner. The web personalization mechanism is based on dynamic creation and update of user pro les according to the users prefer- ences when browsing. In parallel a user's pro le is a ected by user grouping details, which are constructed by users with similar pro les. Assuming that required information, such as article tagging, keywords to categories match- ing and articles to categories relation is already part of the meta-portal we present a novel mechanism that can build and maintain a user pro le which is formed without disturbing the user. Furthermore, we describe the real-time user-centred document grouping mechanism that is implemented to support the web personalization system and present the experimental evaluation of the whole system. Keywords: personalization, web personalization, on-line document grouping, user pro ling, meta-portal %B Journal of Network and Computer Applications, Elsevier Science %P 1446-1453 %G eng