23.1 Practical Applications

Applications are focused on a particular domain and task. This permits the system's performance to be tuned to that task, and leads to significant improvement.

• machine translation
  • 20K-100K words in lexicon

  • 100-10K grammar rules

• database access

• information retrieval
  • document search based on key words

• text categorization
  • news story seach based on subject

• data extraction
  • fill in the slots of the best-matching frame

• others
  • email filter

  • internet query server