Building Thai WordNet with a Bi-directional Translation Method

This research presents a method of building Thai WordNet using an automatic bi-directional translation system with two EnglishThai dictionaries, LEXiTRON and Thiengburanathum Dictionary. The former was compiled using a corpus-based approach, whilst the latter was compiled on the basis of the author´s expertise. The results show that using LEXiTRON gives an F-measure of 50.36 for synset aspect, and 25.01 for word aspect, while using the Thiengburanathum Dictionary results in F-measure of 64.51 for synset aspect and 34.54 for word aspect. Furthermore, for a combination of two dictionaries, the F-measure increases to 67.16 for synset aspect and 36.27 for word aspect.