1. Dejan Lavbič Dejan.Lavbic@fri.uni-lj.si http://www.lavbic.net University of Ljubljana, Faculty of Computer and Information Science, SLOVENIA

2. Agenda  Motivation » semantic integration » problem of trust  Problem  Trust and semantic integration of data » modelling trust  SocioLeaks case study » technology » ontologies » example case study  Conclusions

3. Motivation (1)  semantic integration of various data sources that include information about business entities and people  the problem of trust as a method of dealing with uncertainty especially when dealing with online personal identity government registers vs. online social networks, newspaper archives etc.

4. Motivation (2) Identify person from keyword and display known properties. Sources Wikipedia Freebase …

5. Problem (1)  Lack of semantically integrated information about online personal identity with the purpose of: coping with corruption in crossing the frontiers of legislation, fraud detection in banks, insurance companies and other public institutions, pattern discovery and identification.

6. Problem (2)  current approaches deal with integration of information from several data sources and omit or don't fully address the aspect of trust,  main focus on personal information from social networks which are not very reliable as users for various reasons tend to give false information.

7. Trust and semantic integration (1) Definition of trust  Trust is … a measurable belief that utilizes personal experiences ○ experiences of others or possibly combined experiences, to make trustworthy decisions about an entity ○ a trustworthy decision is assumed to be a transitive process such that there is a web of trust network in which a link between two entities means that a trustworthy decision has been made and the quantitative value of that trust has been evaluated.

8. Trust and semantic integration (2) Modelling trust (1)

9. Trust and semantic integration (3) Modelling trust (2)

10. Trust and semantic integration (4) Modelling trust (3)

11. Trust and semantic integration (5) Modelling trust » example (4)

12. SocioLeaks case study (1) Technology  Open source technologies that support current W3C standards in Semantic Web and linked-data applications Apache Jena framework

13. SocioLeaks case study (2) Ontologies

14. SocioLeaks case study (3) Prototype example

15. SocioLeaks case study (3) Prototype example (1) Traversal is performed by specifying entry point of 1 or 2 entities. Defining the length of property paths to follow. Considering the time dimension. The trust level threshold. Filtering of entities and relations.

16. SocioLeaks case study (4) Prototype example (2)

17. Conclusion  Proposed the use of Semantic Web technologies for semantic integration of data about business entities and people coupled with trust layer. Several layers of trust – data source, schema level entity and instance level entity. Enables filtering the data based on the user preference. Application of the approach is feasible in several cases – banks, insurance companies etc.

18. Discussion  Thank you for your attention! Questions, comments and critiques are more than welcome! » http://www.lavbic.net » Dejan.Lavbic@fri.uni-lj.si » @dlavbic