Vocabulary knowledge plays an important role in language learning and language proficiency, but it is difficult to know how much of a role it plays without appropriate vocabulary measures. In this article, we first discuss learner vocabulary in our research on Korean as a second/foreign language. Unable to find appropriate measures for receptive…

Lexical diversity (LD) is an important indicator of second language lexical development. Much research has investigated LD indices, with a focus on learners of English. However, further research is needed in languages that are typologically distinct from English, such as Korean. In this study, we evaluated the reliability and validity of LD…

The present study aimed to validate a 70-item Korean bilingual version of the Vocabulary Size Test (VST) using Rasch modeling. The goal was to assess the applicability of this Korean version of the VST for Korean learners of English in an English as a foreign language (EFL) context by examining validity evidence based on Messick's framework.…

Given the lack of computational tools available for assessing second language (L2) production in Korean, this study introduces a novel automated tool called the Korean Syntactic Complexity Analyzer (KOSCA) for measuring syntactic complexity in L2 Korean production. As an open-source graphic user interface (GUI) developed in Python, KOSCA provides…

This study investigates the acoustic realizations of English phonemic contrasts by Korean EFL learners, comparing their productions with those of native English speakers. Focusing on the segmentally correct production, the research aims to determine if Korean learners' acoustic properties align with those of native speakers, influenced by second…

This study investigates how L1-Korean L2-English learners perform with regard to articles in both explicit and implicit tasks. It also examines the role of L1-transfer from Korean demonstratives to English definites in L2 article production. 21 native English speakers and 27 adult intermediate L1-Korean L2-English learners were tested. The…

University classrooms are increasingly populated by students with diverse nationalities and native languages (L1). The growing number of students in English-led classrooms who speak English as a second or lower language (L2) may face added difficulties in understanding the specific task objectives or directions, as explained by native-…

aaaPlural marking differs across languages. Some must mark plurality using an overt morpheme (e.g. English, Russian), while others mark it optionally (e.g. Korean) or lack an explicit plural morpheme (e.g. Chinese). This crosslinguistic difference in plural marking has received much attention in research exploring language transfer in the context…

The current study explores the effects of processing demands and proficiency on second language (L2) learners' acceptability judgment of wh-island sentences. A total of 65 adult Korean learners of English and ten native speakers (NSs) of English participated in an experiment that combined self-paced reading and acceptability judgment. They were…

Multilingual learners (MLs) are students whose primary language is not English and are eligible for English language development services through the Transitional Bilingual Instruction Program (TBIP). Eligible MLs receive TBIP services until they become proficient in English. During the 2022-23 school year, 149,357 students were identified as…