1. MICHAL TVAROŽEK, MICHAL BARLA, GYÖRGY FRIVOLT, MAREK TOMŠA, MÁRIA BIELIKOVÁ Improving Semantic Search via Integrated Personalized Faceted and Visual Graph Navigation {TVAROZEK,BARLA,FRIVOLT,TOMSA,BIELIK} [AT] FIIT.STUBA.SK INSTITUTE OF INFORMATICS AND SOFTWARE ENGINEERING FACULTY OF INFORMATICS AND INFORMATION TECHNOLOGIES SLOVAK UNIVERSITY OF TECHNOLOGY IN BRATISLAVA

2. Motivation Semantic Web applications Search and navigation related issues  Difficult construction of queries and ambiguity  Open ended and exploratory tasks  Complex and hard to use search interfaces Insufficiency of classical faceted browsers  Suitability of visual approaches January 21, 2008 SOFSEM 2008, High Tatras, Slovakia

3. Personalized faceted and visual browsing January 21, 2008 SOFSEM 2008, High Tatras, Slovakia

4. Example: Faceted browser January 21, 2008 SOFSEM 2008, High Tatras, Slovakia

5. Faceted browsing challenges January 21, 2008 SOFSEM 2008, High Tatras, Slovakia Managing information overload  Too many facets (complex information spaces)  Too many restrictions (large information spaces)  Still too many search results  Hard to understand instance details Advanced exploratory tasks

6. Faceted browser enhancements January 21, 2008 SOFSEM 2008, High Tatras, Slovakia

7. Facet adaptation, annotation, recommendation January 21, 2008 SOFSEM 2008, High Tatras, Slovakia

8. Faceted browser enhancements December 18, 2007 SMAP 2007

9. Example: Visual navigation January 21, 2008 SOFSEM 2008, High Tatras, Slovakia

10. Navigating search results January 21, 2008 SOFSEM 2008, High Tatras, Slovakia Hierarchical clusters  Cluster size annotation  Similarity annotation Annotations  Property summarization  Most frequent properties

11. Navigating instance neighborhoods January 21, 2008 SOFSEM 2008, High Tatras, Slovakia

12. Navigating instance properties January 21, 2008 SOFSEM 2008, High Tatras, Slovakia

13. Relevance and user models January 21, 2008 SOFSEM 2008, High Tatras, Slovakia Automatic acquisition from user behavior User characteristics (long-term and short-term) In-session behavior Global trends and popularity Similar users and social relations

14. Conclusions (1) January 21, 2008 SOFSEM 2008, High Tatras, Slovakia Evaluation with multiple domain ontologies  Scientific publications (mapekus.fiit.stuba.sk)  Digital photographs Prototype implementation  Factic + ClusterNavigator/Clusterer  Java, Sesame, OWL + Prefuse, MySQL

15. Conclusions (2) Integrated faceted and visual navigation Personalization improves user experience Future work  Handling multiple/multi-domain ontologies  Leveraging social networks for clustering, navigation and visualization January 21, 2008 SOFSEM 2008, High Tatras, Slovakia

16. mapekus.fiit.stuba.sk January 21, 2008 SOFSEM 2008, High Tatras, Slovakia