Copyright © 2006 The Institute of Electronics, Information and Communication Engineers
Regular Section -- Papers -- Natural Language Processing |
Construction of Thai Lexicon from Existing Dictionaries and Texts on the Web
1 The authors are with Sirindhorn International Institute of Technology, Thammasat University, 131 Tiwanont Rd. Bangkadi, Pathumthani, Thailand. E-mail: thatsanee{at}tcllab.org, 2 The authors are with Thai Computational Linguistics Lab., NICT Asia Research Center, Thailand.
A lexicon is an important linguistic resource needed for both shallow and deep language processing. Currently, there are few machine-readable Thai dictionaries available, and most of them do not satisfy the computational requirements. This paper presents the design of a Thai lexicon named the TCL's Computational Lexicon (TCLLEX) and proposes a method to construct a large-scale Thai lexicon by re-using two existing dictionaries and a large number of texts on the Internet. In addition to morphological, syntactic, semantic case role and logical information in the existing dictionaries, a sort of semantic constraint called selectional preference is automatically acquired by analyzing Thai texts on the web and then added into the lexicon. In the acquisition process of the selectional preferences, the so-called Bayesian Information Criterion (BIC) is applied as the measure in a tree cut model. The experiments are done to verify the feasibility and effectiveness of obtained selection preferences.
Key Words: Thai lexicon construction, logical and selectional preferences semantic constraints, semantics constraint acquisition, tree cut model
Manuscript received April 21, 2005. Manuscript revised October 18, 2005.
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