Semantics Perspective on Physical-Cyber-Social Computing

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Presentation at Dagstuhl Workshop on Physical-Cyber-Social Computing, Sept/Oct 2013

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Semantics Perspective on Physical-Cyber-Social Computing

  1. 1. Institute for Web Science & Technologies – WeST Semantics Perspective on Physical-Cyber-Social Computing Steffen Staab, With research work from WeST Team
  2. 2. Steffen Staab 2Semantics Perspective Prelude: Web Observatory Collect PCSC data & ground truth! Where is our PCSC observatory? Understanding  Collecting  Describing  Analyzing  Modeling  Predicting  Repeating!
  3. 3. Steffen Staab 3Semantics Perspective And now for something completely different... Where is our PCSC observatory?
  4. 4. Institute for Web Science & Technologies – WeST Semantics Perspective on Physical-Cyber-Social Computing Steffen Staab, With research work from WeST Team
  5. 5. Steffen Staab 5Semantics Perspective Physical-Cyber-Social Computing Physical Sensors Social Computing Cyber Understanding And here some miracle M occurs! Let‘s analyse this in more detail!
  6. 6. Steffen Staab 6Semantics Perspective Physical-Cyber-Social Computing Physical Sensors Social Computing Cyber Understanding And here some miracle M1 occurs Another miracle M2 occurs
  7. 7. Steffen Staab 7Semantics Perspective Physical-Cyber-Social Computing Physical Sensors Social Computing Cyber View Semantic integration Semantic interfaces Integration Model Understanding Semantic
  8. 8. Institute for Web Science & Technologies – WeST Semantic Integration
  9. 9. Steffen Staab 9Semantics Perspective Semantic Integration  Ontology definition  Ontology mapping  Programming with ontologies! (often forgotten part!)  Established, but still not known too well  Too much myth?
  10. 10. Steffen Staab 10Semantics Perspective Semantic Integration: refering to a story by Alan Rector
  11. 11. Steffen Staab 11Semantics Perspective Semantic Integration: refering to a story by Alan Rector FeverElecHeatElemmeasuringTempPhysSensor Complex concept
  12. 12. Institute for Web Science & Technologies – WeST Semantic Models Also a way to do integration!!!!
  13. 13. Steffen Staab 13Semantics Perspective Person sensors Physical Sensors Situational Context Environment s. Tool (car...) Group Social Computing Social Context Role ... Cyber
  14. 14. Steffen Staab 14Semantics Perspective Person sensors Physical Sensors Situational Context Environment s. Tool (car...) Group Social Computing Social Context Role ... Text Cyber Networks Media Actions/Transactions Semantic Represen. Pragmatic interpretat.
  15. 15. Steffen Staab 15Semantics Perspective Meaning: Contextualization of Topics - MGTM  Flickr photos of food, having tags  Geographical Topic Models  Spatial context improves content analysis
  16. 16. Steffen Staab 16Semantics Perspective Neighbour Topic Exchange
  17. 17. Steffen Staab 17Semantics Perspective Neighbour Topic Exchange
  18. 18. Steffen Staab 18Semantics Perspective Neighbour Topic Exchange Can be generalized to other features than geolocation: • Time (also cyclic time) • Temperature • ....
  19. 19. Steffen Staab 19Semantics Perspective Meaning: Understanding Context – EU Live+Gov Urban Maintenance (Buitenbeter)  Citizens reporting infrastructure damages  Text+Image+Sensor readings submitted by citizen • Activity recognition: walking, cycling,.. • Higher level context: shopping, commuting,...
  20. 20. Steffen Staab 20Semantics Perspective Meaning: Linking of content - EU EPPICS Use Case: Water management  Floods of the river Po (Italy)  Observations:  Physical: • Water level sensors • Smartphone geo positions (where do people drive?)  Social & content • What do people tweet („road blocked“, „went there and there“)  Challenges:  Linking data  Correlating data („level X blocks road Y“)
  21. 21. Institute for Web Science & Technologies – WeST Semantic Views
  22. 22. Steffen Staab 22Semantics Perspective Relevance in "typical" social network graph
  23. 23. Steffen Staab 23Semantics Perspective Relevance: Retrieving Node A's news stream
  24. 24. Steffen Staab 24Semantics Perspective Relevance: Retrieving Node A's news stream
  25. 25. Steffen Staab 25Semantics Perspective Meaning: Turning sensing of attention into semantics  Tagging by sensing  Interestingness  Content tags to regions
  26. 26. Institute for Web Science & Technologies – WeST Conclusion
  27. 27. Steffen Staab 27Semantics Perspective Challenges in Semantics4PCS-computing  Sensor ontology (SSN)  Better understanding of what does not work  Better understanding of whether the problem is in the ontology or in the modeling!  Abstraction and contextualization from  lowest level interpretation („34734893“)  to mid level interpretation • „deviating from the norm by twice standard deviation“ • „cycling“ „running“  To high level interpretation • „broad flooding“ • „shopping“ „commuting“
  28. 28. Steffen Staab 28Semantics Perspective Conclusion: Semantics in PCS-Computing  Representing contextualized facts  Extended provenance -> who, where, when,...  Understanding context  More than sensor readings -> Reporting  Using context  Influences semantics  Influences use of semantics (pragmatics) -> Actions!
  29. 29. Steffen Staab 29Semantics Perspective Some of many open questions  Which context is most useful when?  What are good models for higher level interpretations?  Notion of pragmatics? Which data is good for which purpose?
  30. 30. Institute for Web Science & Technologies – WeST Thank you!
  31. 31. Steffen Staab 31Semantics Perspective References 1. R. Pickhardt, T. Gottron, A. Scherp, S. Staab, Jonas Kunze. Efficient Graph Models for Retrieving Top-k News Feeds from Ego Networks. In: SocialCom 2012 – Proceedings of the 2012 IEEE Fourth International Conference on Social Computing, Amsterdam, NL, September 3-6, 2012. 2. Tina Walber, Chantal Neuhaus, Ansgar Scherp, Steffen Staab, Ramesh Jain. Creation of Individual Photo Selections: Read Preferences from the Users' Eyes. In: Proceedings of ACM Multimedia 2013, Barcelona, October 2013. 3. C. Kling et al. Detecting Non-Gaussian Geographical Topics in Tagged Photo Collections. Tech Report. 4. http://liveandgov.eu/

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