[IEEE 2014 17th Oriental Chapter of the International Committee for the Co-ordination and Standardization of Speech Databases and Assessment Techniques (COCOSDA) - Phuket, Thailand (2014.9.10-2014.9.12)] 2014 17th Oriental Chapter of the International Committee for the Co-ordination and Standardization of Speech Databases and Assessment Techniques (COCOSDA) - Estimating vocal tract shapes of Thai vowels from contextual vowel variation