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    SemanticWebApp SemanticWebApp Presentation Transcript

    • Semantic Web Applications Horatiu Mocian, 04.05.2011
    • Use of Semantic Web
      • Semantic knowledge bases
        • Freebase, DBpedia
      • Semantic tagging tools
        • OpenCalais, Zemanta
      • Semantic search
        • TrueKnowledge, Google Squared
      • Data integration
    • 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 )
    • Semantic tagging tools
      • Tools that automatically identify, disambiguate and mark (tag) named entities from a text
      • Commercial: OpenCalais, Zemanta, ...
      • Academic: GATE, Stanford NER, ...
    • Web search engines
      • Traditional search engines
        • Google, Bing, Yahoo!
      • Structured search engines
        • WolframAlpha, TripAdvisor
      • Semantic search engines
        • TrueKnowledge, Twine (extinct), Powerset (extinct), Google Square
    • 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
    • Natural Language Processing
      • Building block of the semantic web
      • Subfields
        • Machine Translation
        • Automatic Summarization
        • Named Entity Recognition
        • Speech Recognition
        • POS Tagging
    • RDF – a reminder
        • Formats: XML, N-Triple, Turtle
      Subject Predicate Value Object Triple
    • List of applications
      • Freebase
      • Dbpedia
      • data.nytimes.com
      • OpenCalais, Zemanta
      • TrueKnowledge, Google Square
      • Bing
      • Microformats + Google, Bing
    • 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
    • DBpedia
      • http://dbpedia.org/About
      • Largest semantic knowledge base
      • “ A structured Wikipedia”
      • Open community project
      • 3.5 million things (672M triples)
    • 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
    • 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
    • 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
    • TrueKnowledge
      • www.trueknowledge.com
      • Pure semantic search (one of the fewest)
      • Company based in Cambridge, UK
      • 19,000,000 things (531M facts)
    • Google Squared
      • http://www.google.com/squared/
      • Google's natural search engine
      • Developed by Google NY office
      • Launched in 2009
    • 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
    • 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
    • Interested in more?
      • TripIt (tripit.com)
      • Evri (evri.com)
      • Inform (inform.com)
      • Daylife (daylife.com)
      • Google “semantic web applications”
    • Thank you Questions?