국어 모음 하강에 대한 통시적 연구

Abstract

Under this thesis, it is intended to disclose the possibility of vowel falling in the change of əj>aj and change of ɯj>əj arising in the modern Korean language period. This change arising irregularly and sporadically in some of the phrases has been understood as monophthongization, vowel harmony and vowel raising of the falling diphthong. However, as a result of detailed review for these changes, the parts not conforming to the foregoing have been found. Under 2.1., the change of əj>aj showed up during the 16-17th century that it is not the change after the monophthongization. There is a greater restriction on the expression of ㅏ than on ㅓ. Thus, The confusion of ㅓ and ㅏ cannot be viewed simply as a notation reflecting the confusion of vowel harmony. This is construed as to the fact that, comparing to /ㅏ/, /ㅓ/ is unstable phonemes that it is even more vulnerable to the changes. Under 2.2., existing discussion that is construed as the change occurring with the influence of the vowel raising with the change in ɯj>əj has been reviewed. As a result, unlike the fact that the vowel raising occurred around the 19th century prefix location, ㅡ>ㅓbegan from the non-prefix from the 16-17th century, and based on the co-existence of ɯj>əj and ㅢ>ㅓ up to 18-19th century, the change of ɯj>əj is asserted as not related directly with the vowel raising. In Chapter 3, əj>aj and ɯj>əj are not the change to confirm the monophthongization or vowel raising, but also asserted to render the commonality for falling vowel by accepting the phoneme phenomenon itself. With the retraction of /ㅓ/, the voice realizing territory of /ㅓ/ has broadened ㅓ and ㅏ build up the affiliation relationship by high and low to cause the confusion of ㅔ~ㅐ, ㅓ~ㅏ. Also, it describes that ɯj>əj is a change to show the expansion of voice realizing territory of /ㅓ/ together with ㅡ>ㅓ.