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The purpose of this paper is to examine the acoustic properties of the Korean monophthongs in Jeju Korean according to speaking style and speaker gender. For the acoustic parameters, duration and the first three formant frequencies(F1, F2, F3) were measured, using the ‘PRAAT’. The study results showed that F1 and F3 were influenced by both gender and speaking style, but F2 was only influenced by gender. With regard to speaking style, it was found that word reading produced a longer duration, lower tongue position, and higher F3 than did passage reading and news article reading. Tongue advancement for F2, however, did not differ across speaking style. Concerning speaker gender, male speakers produced a longer duration, higher and more backed tongue position, and higher F3 than female speakers. As for the vowel quality, the high vowels /ㅣ, ㅡ, ㅜ/ had a longer vowel duration than non-high vowels /ㅔ, ㅓ, ㅏ, ㅗ/. In regard to vowel space, differences in speaking style and speaker gender were found as well.