Guest lecture given at the JiaoTong University, Shanghai, China.

1. December 7 th , 2010, Shanghai, China Latent Semantics and Social Interaction Fridolin Wild KMi, The Open University

4. Information what is Meaning could be the quality of a certain signal. Meaning could be a logical abstractor = a release mechanism. (96dpi) meaning

8. A “Semantic Community” LSA SNA Associative Closeness Concept (disambiguated term) Person Social relation

9. LSA

11. latent-semantic space Singular values (factors, dims, …) Term Loadings Document Loadings

12. (Landauer, 2007)

13. Associative Closeness You need factor stability? > Project using fold-ins! Term 1 Document 1 Document 2 Angle 2 Angle 1 Y dimension X dimension

14. Example: Classic Landauer { M } = Deerwester, Dumais, Furnas, Landauer, and Harshman (1990): Indexing by Latent Semantic Analysis, In: Journal of the American Society for Information Science, 41(6):391-407 Only the red terms appear in more than one document, so strip the rest. term = feature vocabulary = ordered set of features TEXTMATRIX

15. Reconstructed, Reduced Matrix m4: Graph minors : A survey

17. (S)NA

19. Constructing a network from raw data forum postings incidence matrix IM adjacency matrix AM IM x IM T

20. Visualization: Sociogramme

21. Measuring Techniques (Sample) Degree Centrality number of (in/out) connections to others Closeness how close to all others Betweenness how often intermediary Components e.g. kmeans cluster (k=3)

22. Example: Joint virtual meeting attendance (Flashmeeting co-attendance in the Prolearn Network of Excellence)

23. Example: Subscription structures in a blogging network (2 nd trial of the iCamp project)

24. MIA

26. The mathemagics behind Meaningful Interaction Analysis

27. Network Analysis

28. MIA of the classic Landauer

32. Applications

33. Capturing traces in text: medical student case report

34. Internal latent-semantic graph structure (MIA output)

36. Evaluating Chats with PolyCAFe

38. Conclusion

40. #eof.

42. Influencing Parameters (LSA) Pearson(eu, österreich) Pearson(jahr, wien)