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Towards ontology language handling imperfection. Alan Eckhardt, Peter Vojtáš WIKT 2006. DL and Web modelling ( časť prezentácie z ISWC06 ). DL basis for OWL Value restriction has to be reconsidered EL DL sufficient for applications EL querying in poly time

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towards ontology language handling imperfection

Towards ontology language handling imperfection

Alan Eckhardt, Peter Vojtáš

WIKT 2006

dl and web modelling as prezent cie z iswc06
DL and Web modelling (časť prezentácie z ISWC06)
  • DL basis for OWL
  • Value restriction has to be reconsidered
  • EL DL sufficient for applications
  • EL querying in poly time
  • Extension to user preference modelse.g. a user looking for a cheap hotel close to a beach
  • Aggregation of particular attribute preferences to global preference
  • Top-k answers

A.Eckhardt, P. Vojtáš

uncertainty in web modelling
Uncertainty in Web Modelling
  • Probabilistic models in SW
  • Fuzzy logic models SW
  • Fuzzy EL - fuzzy concepts
  • - crisp roles
  • - fuzzy aggregation
  • Enables concepts like

@( price.cheap, distance.close)

  • Problem of learning @ for each user

A.Eckhardt, P. Vojtáš

slide4

Description logic – classical

AL*

interpretation

EL

A.Eckhardt, P. Vojtáš

slide5

Description logic – full fuzzification – U. Straccia

syntax

Fuzzy

interpretation

Which

t-norm

t-conorm?

A.Eckhardt, P. Vojtáš

bayesian networks slide z l nku s m vomlelovou
Bayesian networks (slide z článku s M. Vomlelovou)
  • Graph represents relations between variables
  • Conditional probabilities
  • Typical use:
    • We know: A=2, C=2
    • We ask for: P(B|A=2,C=2)

A.Eckhardt, P. Vojtáš

bayesian el dl and others
Bayesian EL DL and others
  • Concepts are r. v. over preference scale
  • Roles are crisp / certain
  • Aggregation = combination function
  • Integrated with fEL, classical EL , …

A.Eckhardt, P. Vojtáš

conclusion
Conclusion
  • Sharing ideas
  • Ideas supported by an analogy working in LP and simple experiments
  • Further development of

formal model

experiments

OWL extension

  • Questions, comments, …

A.Eckhardt, P. Vojtáš

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