Using Data Mining for Facilitating User Contributions in the Social Semantic Web

Doctoral Thesis / Dissertation from the year 2011 in the subject Computer Science - Internet New Technologies grade: 10 Karlsruhe Institute of Technology (KIT) language: English abstract: Social Web applications have emerged as powerful applications for Internet users allowing them to freely contribute to the Web content organize and share information and utilize the collective knowledge of others for discovering new topics resources and newfriends. While social Web applications such as social tagging systems have many benefits they also present several challenges due to their open and adaptive nature. The amount of user generated data can be extremely large and since there is not any controlled vocabulary or hierarchy it can be very difficult for users to find the information that is of their interest.In addition attackers may attempt to distort the system's adaptive behavior by inserting erroneous or misleading annotations thus altering the way in which information is presented to legitimate users. This thesis utilizes data mining and machine learning techniques to address these problems. In particular we design and develop recommender systems to aid the user in contributing to the Social Semantic Web. In addition we study intelligent techniques tocombat attacks against social tagging systems. In our work we first propose a framework that maps domain properties to recommendation technologies. This framework provides a systematic approach to find the appropriate recommendation technology for addressing agiven problem in a specific domain. Second we improve existing graph-based approaches for personalized tag recommendation in folksonomies. Third we develop machine learning algorithms for recommendation of semantic relations to support continuous ontology development in a social semanticWeb environment. Finally we introduce a framework to analyze different types of potential attacks against social tagging systems and evaluate their impacton t