1. Faculty of Informatics and Information Technologies Slovak University of Technology Personalized Navigation in the Semantic Web Michal Tvarožek Mentor: prof. Mária Bieliková

2. Faculty of Informatics and Information Technologies Slovak University of Technology Presentation outline Motivation Proposed solution: Enhanced Faceted Semantic Browser Prototype implementation Research agenda Summary

3. Faculty of Informatics and Information Technologies Slovak University of Technology Motivation Large open information spaces Navigation related problems Recursion rate ~ 60% “Lost in hyperspace” syndrome Ineffective navigation history Search related problems Many irrelevant search results Difficult construction of semantic queries

4. Faculty of Informatics and Information Technologies Slovak University of Technology Proposed solution: Enhanced faceted semantic browser Faceted Classification Faceted browser Semantic Web Ontologies Semantic search Adaptive Web Systems Adaptive navigation Adaptive presentation

5. Faculty of Informatics and Information Technologies Slovak University of Technology Faceted browser characteristics Faceted navigation Multi-level facets Equally weighted facets or Primary and Secondary facets Search results processing Sorting Comparing Views

6. Faculty of Informatics and Information Technologies Slovak University of Technology Faceted browser enhancements Ontological database support Semantic queries (simple/complex, reasoning) Advanced query mode Combination of multiple facet values Additional combination functions NOT, OR, () Indirect definition of faced values by defining facet value restrictions Built-in support for event logging User actions, the corresponding server events and their semantics

7. Faculty of Informatics and Information Technologies Slovak University of Technology User adaptation overview Adaptive navigation Adaptation of facets and facet values Annotation of facets and facet values Annotation of search results Adaptive presentation of search results Different views for the search results Highlighting of relevant information

8. Faculty of Informatics and Information Technologies Slovak University of Technology User interface – concept design

9. Faculty of Informatics and Information Technologies Slovak University of Technology User model Ontological representation Derived from a domain ontology Defines user goals Defines user characteristics Relation to a specific concept Relevance to a specific goal Confidence in its certainty

10. Faculty of Informatics and Information Technologies Slovak University of Technology Adaptation of facets Evaluating facet suitability (relevance) Sorting facets and facet values Selecting relevant items Emphasizing most relevant items Hiding irrelevant items Dynamic facet generation from the domain ontology and user model Utilizing concept similarity and collaborative filtering

11. Faculty of Informatics and Information Technologies Slovak University of Technology Annotation of facets, search results Presentation of additional information Background/text color Font size Emoticons, traffic lights Evaluation of Gain provided by using a facet Relative number of instances in facets Concept similarity (“ideal” search results)

12. Faculty of Informatics and Information Technologies Slovak University of Technology Prototype implementation Technical background Implementation in Java 1.5 Presentation framework Apache Cocoon Ontological repository Sesame Current functionality Semantic queries (simple) Presentation of search results Simple processing of search results

13. Faculty of Informatics and Information Technologies Slovak University of Technology Architecture overview

14. Faculty of Informatics and Information Technologies Slovak University of Technology User interface

15. Faculty of Informatics and Information Technologies Slovak University of Technology Research agenda Work in progress Implementation of the faceted browser Detailed design of user adaptation methods Future work Implementation of user adaptation methods Evaluation of the proposed approach

16. Faculty of Informatics and Information Technologies Slovak University of Technology Summary Navigation and search related problems Enhanced faceted semantic browser Faceted browsing Ontologies & semantic search Adaptive navigation & presentation Prototype implementation Design and implementation of user adaptation Evaluation in the domain of job offers