Multiple Use of Content in a WebBased Language Learning System

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Multiple Use of Content in a Web-Based Language
Learning System

• Judith Knapp
• European Academy Bolzano, Italy
• Johann Gamper
• Free University Bolzano, Italy
• Peter Brusilovsky
• University of Pittsburgh, USA
• ICALT 2004

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Outline

• The ELDIT dictionary
• Reusing the Illustrative Content
• Problems
• Solutions
• Achievements
• Evaluation
• Related Work
• Conclusions

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The ELDIT dictionary

• German Italian
• 3000 word entries
• http//www.eurac.edu/eldit

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Illustrative Content in ELDIT

• 50.000 example sentences in ELDIT
• Handmade, partially supported by corpora
• PROBLEM
• Learners need even more examples
• Authoring of didactic material is difficult and
  time consuming

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Reusing Existing Content

• SOLUTION
• Information and Illustration in a Hypermedia
  System

11 Relation
nm Relation
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Problems

• Unstructered patterns
• (gli occhi, la bocca, il viso,
  belli/bella/bello)
  
• Conjugated or declined forms
• (to go home ? I went home very late)
• Collocations
• (to go home ? I went out and came home very
  late)
  
• Word meanings
• (house as a place to live and work ? The royal
  house of
  
• Norway is a branch of the princely family of
  Glücksburgh)
  

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SolutionsUnstructed Patterns

• Unfold meta symbols
• Unfold variations
• Remove general words

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SolutionsConjugated or Declined Forms

• Stemming
• Lemmatizing

Die Vögel bauten ihre Nester aus...
ein Vogel baut ein Nest
lemmatizing
lemmatizing
Der Vogel bauen mein Nest aus
Vogel bauen Nest
searching
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SolutionsCollocations

• Advanced Concordancing

to go out to come home to go home a beautifu
l house

I went out and came home very late
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SolutionsWord meanings

• Context vectors

House as a building to build a house
to rent a house to move house House
as a dynasty the royal house the house of Scot
land
Build, rent, move,
royal, Scotland,
The royal house of Norway is a branch of
the princely family of Glücksburgh.
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Achievements
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Evaluations

• Number and Didactic Validity
• - Different cases
• Single words in citation form 100
• Multiple word expressions 90
• Meaning disambiguation many and valid examples
  for frequent meanings, few and invalid examples
  for rare meanings
  

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Related Work

• - Reusing Content using Metadata
• LOM, DC, SCORM,
• - Differences
• Focus on document structures and navigation
  services.
  
• Level of granularity.

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Related Work

• - Searching Corpora with concordance tools
• Pet2000, Lexica,
• - Differences
• Propositions versus Indications
• Contents have different scopes
• In ELDIT unknown words are linked

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Conclusion

• The ELDIT dictionary
• Reusing the Illustrative Content
• Problem Need of examples
• Solution reuse of content
• - Technical Problems
• Computational-linguistics Solutions
• Achievements
• Evaluation
• Related Work