Generally, the vowels in content words are phonetically more prominent than the ones in function words in English. This is because they have a stress of a suprasegmental feature, making them produced longer in duration and greater in intensity. Based on this phonetical phenomenon, this research investigates the relation between the vowel duration and intensity in English NPs [an article—a monosyllabic noun] and the English proficiency of Korean learners. For analysis, the researchers utilized Rated Korean-Spoken English Corpus (made in 2017) to collect and measure the duration and intensity of each vowel in the monosyllabic noun phrases of the 853 sentences articulated by the Korean speakers who were categorized into one of the four different English proficiency groups based on their speaking ability (Advanced, Intermediate-High, Intermediate-Low, and Novice). From the findings, it was revealed that the higher the proficiency level becomes, the greater the ratio of the vowel duration in the nouns of a content word to the vowel duration in the articles of a function word gets, meaning that the higher the English proficiency level reaches, the better the Korean speakers articulate the words with proper stresses as native speakers do. However, the ratio of the vowel intensity in the nouns to the vowel intensity in the articles has less relation to Korean speakers' English proficiency.Generally, the vowels in content words are phonetically more prominent than the ones in function words in English. This is because they have a stress of a suprasegmental feature, making them produced longer in duration and greater in intensity. Based on this phonetical phenomenon, this research investigates the relation between the vowel duration and intensity in English NPs [an article—a monosyllabic noun] and the English proficiency of Korean learners. For analysis, the researchers utilized Rated Korean-Spoken English Corpus (made in 2017) to collect and measure the duration and intensity of each vowel in the monosyllabic noun phrases of the 853 sentences articulated by the Korean speakers who were categorized into one of the four different English proficiency groups based on their speaking ability (Advanced, Intermediate-High, Intermediate-Low, and Novice). From the findings, it was revealed that the higher the proficiency level becomes, the greater the ratio of the vowel duration in the nouns of a con...
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