A purpose of this thesis is to consider a change of a sound of ‘ㅘ, ㅝ’ which happened in middle Korean. ‘w’ of the 15th century later was a variance sound of ‘ㅗ/ㅜ’. Afterwards, a rank is changed to phoneme /w/ in the 16th century by labial feature which is a common feature of phoneme ‘ㅸ’ and variance [w]. Therefore,compound phoneme ‘oa, uə’ experience a change of a sound to EumGun ‘wa, wə’.The 15th century medium term and latter term appear so that gliding of w and addition of w-glide and deletion of w-glide is different. Also, Addition of w-glide happens productively in the 16th century. ‘ㅸ>w’ change and addition of w-glide is the main cause of change of a sound of ‘ㅘ, ㅝ’. This change of a sound of ‘ㅘ’, ‘ㅝ’ finished a system of a rising diphthong. It participated in a change of a vowel sound system to have happened in modern korean. Also, It brought extinction of ‘ㅙ, ㅞ’.
A purpose of this thesis is to consider a change of a sound of ‘ㅘ, ㅝ’ which happened in middle Korean. ‘w’ of the 15th century later was a variance sound of ‘ㅗ/ㅜ’. Afterwards, a rank is changed to phoneme /w/ in the 16th century by labial feature which is a common feature of phoneme ‘ㅸ’ and variance [w]. Therefore,compound phoneme ‘oa, uə’ experience a change of a sound to EumGun ‘wa, wə’.The 15th century medium term and latter term appear so that gliding of w and addition of w-glide and deletion of w-glide is different. Also, Addition of w-glide happens productively in the 16th century. ‘ㅸ>w’ change and addition of w-glide is the main cause of change of a sound of ‘ㅘ, ㅝ’. This change of a sound of ‘ㅘ’, ‘ㅝ’ finished a system of a rising diphthong. It participated in a change of a vowel sound system to have happened in modern korean. Also, It brought extinction of ‘ㅙ, ㅞ’.
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