Vowel duration in English serves as a cue to the voicing distinction of the following consonant, in a way that vowels preceding voiced consonants are longer than those preceding voiceless consonants. This study will examine the differences in vowel duration in various phonetic contexts produced by 8 Korean-speaking L2 learners of English in comparison with the differences produced by 4 native English speakers from the K-SEC corpus (Korean-Spoken English corpus). Specifically, we will test for the durational evidence of the influence of different manners of articulation and syllable positions on preceding or following vowels and investigate how the influence is phonetically realized by two language groups. Our hypotheses and predictions are as follows: 1) vowels are longer when preceded by consonants in coda position than when followed by the same consonants in onset position, 2) vowels are longer when preceded by nasals than when preceded by non-nasal consonants, and 3) Korean speakers produce the differences in vowel length to a smaller extent than native English speakers.Vowel duration in English serves as a cue to the voicing distinction of the following consonant, in a way that vowels preceding voiced consonants are longer than those preceding voiceless consonants. This study will examine the differences in vowel duration in various phonetic contexts produced by 8 Korean-speaking L2 learners of English in comparison with the differences produced by 4 native English speakers from the K-SEC corpus (Korean-Spoken English corpus). Specifically, we will test for the durational evidence of the influence of different manners of articulation and syllable positions on preceding or following vowels and investigate how the influence is phonetically realized by two language groups. Our hypotheses and predictions are as follows: 1) vowels are longer when preceded by consonants in coda position than when followed by the same consonants in onset position, 2) vowels are longer when preceded by nasals than when preceded by non-nasal consonants, and 3) Korean speakers produce the differe...