Designing A Syntax Based Retrieval System03Presentation Transcript
Designing a Syntax-Based Retrieval System for Supporting Language Learning Educational Technology & Society Nai-Lung Tsao1, Chin-Hwa Kuo2, David Wible1 and Tsung-Fu Hung2 Kaun-Hua Huo( 霍冠樺 ) 2009/09/29
Regular expression search engine
Syntax-based text retrieval system
Conclusion and future works
Regular expression search
Advantage: scalable querying
Disadvantage: execution time
Finding example of specific types
The main purpose of the syntax-based text retrieval system is to support grammatical querying of tagged corpora for language learners and teachers.
Consider the following example
In ESL teaching...
keep + Ving
regex (regular expression)
X keep to try
X keep in touch
Regular expression provide more flexible querying, they still create a problem in search response time.
Most of proposals use k-gram index construction and build efficient index structures for quick searching of index terms.
Collocation is a persistent area of difficulty for ESL learners.