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SemanticWebApp Presentation Transcript

  • 1. Semantic Web Applications Horatiu Mocian, 04.05.2011
  • 2. Use of Semantic Web
    • Semantic knowledge bases
      • Freebase, DBpedia
    • Semantic tagging tools
      • OpenCalais, Zemanta
    • Semantic search
      • TrueKnowledge, Google Squared
    • Data integration
  • 3. Semantic knowledge bases
    • Databases where information is stored in a semantic web format (RDF), and is organised in ontologies
    • Most famous
      • Freebase ( www.freebase.com )
      • Dbpedia ( www.dbpedia.org )
  • 4. Semantic tagging tools
    • Tools that automatically identify, disambiguate and mark (tag) named entities from a text
    • Commercial: OpenCalais, Zemanta, ...
    • Academic: GATE, Stanford NER, ...
  • 5. Web search engines
    • Traditional search engines
      • Google, Bing, Yahoo!
    • Structured search engines
      • WolframAlpha, TripAdvisor
    • Semantic search engines
      • TrueKnowledge, Twine (extinct), Powerset (extinct), Google Square
  • 6. Semantic search engines
    • 2 distinctive features
      • Analyze indexed documents semantically
      • Analyze the query text semantically -> answer to natural text questions
    • Not yet mainstream
      • Powerset, Twine, were bought
      • Google, Bing use semantic features
  • 7. Natural Language Processing
    • Building block of the semantic web
    • Subfields
      • Machine Translation
      • Automatic Summarization
      • Named Entity Recognition
      • Speech Recognition
      • POS Tagging
  • 8. RDF – a reminder
      • Formats: XML, N-Triple, Turtle
    Subject Predicate Value Object Triple
  • 9. List of applications
    • Freebase
    • Dbpedia
    • data.nytimes.com
    • OpenCalais, Zemanta
    • TrueKnowledge, Google Square
    • Bing
    • Microformats + Google, Bing
  • 10. Freebase
    • www.freebase.com
    • One of the largest semantic knowledge bases (2 nd ?)
    • Created by the community (large input of data from Wikipedia)
    • Over 22,000,000 topics (361M triples)
    • Its parent, Metaweb Technologies, acquired by Google for $700 million in 2010
  • 11. DBpedia
    • http://dbpedia.org/About
    • Largest semantic knowledge base
    • “ A structured Wikipedia”
    • Open community project
    • 3.5 million things (672M triples)
  • 12. NY Times Linked Open Data
    • http://data.nytimes.com
    • NY Times is one of the largest media companies, news organizations
    • Started publishing semantic data in 2009
    • Currently, it has 10,000 topics
    • Another 30,000 topics will be published
    • A large effort by a large media company
  • 13. OpenCalais
    • http://viewer.opencalais.com
    • Best NLP processing tool (for business articles in English)
    • Developed by ClearForest, Acquired by Reuters (now Thomson Reuters) for $25 million in 2007
    • Used internally to tag Thomson Reuters texts
  • 14. Zemanta
    • http://www.zemanta.com/
    • Finds entities in texts, and enriches them with links, images
    • Useful for blogging
    • Example of bottom-up approach
    • API provides information in RDF format
  • 15. TrueKnowledge
    • www.trueknowledge.com
    • Pure semantic search (one of the fewest)
    • Company based in Cambridge, UK
    • 19,000,000 things (531M facts)
  • 16. Google Squared
    • http://www.google.com/squared/
    • Google's natural search engine
    • Developed by Google NY office
    • Launched in 2009
  • 17. Bing
    • www.bing.com
    • Microsoft's search engine
    • Handles Yahoo! Searches
    • Steadily catching up to Google
    • Has semantic abilities after acquiring Powerset in 2008
    • Examples: recipes, travel, events
  • 18. RDF Microformats
    • HTML tags that can be interpreted semantically
    • More lightweight than proper RDF, easier to integrate in web pages
    • Most common: hCard, hCalendar, hReview, hResume, hRecipe
    • Recognized by both Google, and Bing
    • Example: game reviews on IGN.com
  • 19. Interested in more?
    • TripIt (tripit.com)
    • Evri (evri.com)
    • Inform (inform.com)
    • Daylife (daylife.com)
    • Google “semantic web applications”
  • 20. Thank you Questions?