OntoBlog: Informal Knowledge Management by Semantic Blogging

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OntoBlog Informal Knowledge Management by
Semantic Blogging

• Aman Shakya 1, Vilas Wuwongse 2,
• Hideaki Takeda 1, Ikki Ohmukai 1
• 1 National Institute of Informatics, JAPAN
• 2 Asian Institute of Technology, Thailand

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Blogs

• Publicly accessible web-based publication of
  periodic articles usually in reverse
  chronological order
• Easy publishing platform
• Dynamic media
• Contributions from the community
• Abundant collection of timely data
• Problems
• Unstructured text
• Filtering, organizing, navigating is difficult

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Semantic Web

• The Semantic Web is an extension of the current
  web in which information is given well-defined
  meaning, better enabling computers and people to
  work in cooperation.
• The Semantic Web, Scientific American, May 2001,
  
• Tim Berners-Lee, James Hendler and Ora Lassila
• The Semantic Web is about two things
• Common formats for integration/combination of
  data drawn from diverse sources
• Language for recording how the data relates to
  real world objects
• http//www.w3.org/2001/sw/
• Web of Linked Data
• Current Challenge for the Semantic Web
• How to publish and use enough structured data
  easily?

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Ontology in Semantic Web

• An Ontology is an explicit specification of a
  conceptualization
• - Gruber (1993)

• Conceptualization
• .. the objects, concepts, and other entities
  that are presumed to exist in some area of
  interest and the relationships that hold among
  them

Fig The Semantic Web Stack
Source Tim Berners-Lee (XML2000)
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Semantic Blogging

• Builds upon traditional blogging
• Provides semantic structure to blog items
• Enrich blog entries with metadata
• Combine desirable features of
• Blogging Semantic Web
• Some Semantic Blogging systems
• Semantic Blogging Demonstrator (Cayzer, HP labs)
• Semantic Blogging using Haystack (Karger Quan,
  MIT)
• Semblog (Ohmukai Takeda, NII)
• semiBlog (Möller et al., DERI) (now renamed
  Shift)
• SocioBiblog (Shakya et al., NII)
• Structured Blogging (http//structuredblogging.org
  / )

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Limitations of Current Works

• Authoring metadata is cumbersome
• Limited semantic capabilities
• Linking semantically related blog entries
• Navigating through semantically related blog
  entries
• Searching and organizing relevant blog entries
• Problems of traditional blogging still remain!

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Semantic Blogging forInformal Knowledge
Management

• Semantic Blog
• Capture knowledge of individuals informally
• Not rigid as conventional database driven systems
• Annotate information snippets in blogs with
  semantically structured information
• Link, Organize and Retrieve them effectively
• Utilize Knowledge Base technologies
• Ontology and instances
• Exploit the semantic links in Ontology

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Linking Blogs and Ontology
Semantic Annotation
Blog entries
Ontology
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The OntoBlog Platform

• Semantic Annotation
• Annotate blog entries with existing ontology
  instances
• Integrated Authoring
• Authoring and annotation of blog entries
• Semi-automatic Annotation
• Suggest related instances automatically
• Integrated Services
• Semantic navigation, search and organization
• Feedback for Ontology Maintenance
• Suggest new concepts and instances
• Online demo - http//dutar.ex.nii.ac.jp/ontoblog
  /blog/default/

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Application Scenario
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Implementation
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Blog-Ontology Linking

• Simple language processing techniques
• very fast and quite effective
• For each ontology instance, a keywords element
  contains a collection of related words
• Stemmed blog entries matched against stemmed
  keywords
• Related instances automatically suggested when
  adding/updating blog entries
• Discovered relations stored (if the user
  approves)

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Authoring Blog Entry
Next
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Automatic Suggestions for semantic annotation
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Example Ontology (Computer science department
domain)

• Populated and maintained using Protégé
• OWL micro reasoner for Inference

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Blog-Ontology Linking
Instances in Ontology
Blog Entries
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Semantic Navigation
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Semantic Search

• Simple implementation to demonstrate
  applicability of semantic search
• Augment traditional search results
• Return blog entries linked to semantically
  related instances
• Useful when text search alone does not produce
  enough results
• Depth of semantic search can be controlled

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Semantic Aggregation
Search results
Related Entries
click
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Feedback for Ontology Maintenance

• Users may suggest a new instance and/or concept
• Useful for the administrator/knowledge engineer
  to maintain the ontology
• by adding missing concepts and instances or
  refining them

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Conclusions

• Informal knowledge management can be done by
  semantic blogging
• OntoBlog
• a Semantic Blogging prototype
• Semi-automatic annotation of blog entries with
  existing instances of Ontology
• Linking Blog and Ontology technologies
• Semantic structure of ontology enables semantic
  capabilities like Navigation and Organization in
  blogs

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Future and Ongoing Work

• Decentralized collaborative approach for Ontology
• Semantic capabilities across multiple blogs
• Sophisticated language processing
• WordNet, IE (with supervised/unsupervised
  learning)
• Incorporate mature semantic search
• Enhance inference capabilities
• Ranked information retrieval

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Thank you !

• Questions / Suggestions