Abstract
The aim of this paper is to examine the phonetic realizations of English unstressed vowels produced by advanced Korean learners (KLs) of English compared with English native speakers (NSs) focusing on the comparative study of English words and English loanwords. The result shows that KLs are usually not native-like in producing the English unstressed vowel /ə/ and loanword orthography affects the way the KLs produce /?/. The vowel quality of the unstressed vowels produced by the KLs is different from that of the NSs. In duration and pitch, KLs show significantly less difference between the stressed and unstressed vowels than do the NSs. The KLs usually have a high pitch in the stressed and the last syllable while the NSs usually produce peak F0 in the stressed syllable. When the KLs have a similar vowel quality with that of the NSs, they produce a shorter duration of the unstressed vowels. However, there is no correlation between the realization of the pitch and the vowel quality in KLs speech.