Objective evaluation of second language learner2s translation proficiency using statistical translation measures. - Hajime Tsubaki; Keiji Yasuda; Hirofumi Yamamoto; Yoshinori Sagisaka (ExLing, 2008)

Analysis of L2 English speech corpus by automatic phoneme alignment. - Hajime Tsubaki; Mariko Kondo (SLaTE, 2011)

L2 Learners' Proficiency Evaluation Using Statistics Based on Relationship Among CEFR Rating Scales. - Hajime Tsubaki (DMBD, 2017)

Analysis based on Japanese accented English characteristics categories for objective evaluation. - Hajime Tsubaki (ICDIM, 2017)

Analysis of Native and Non-native Speakers' English Compositions based on Word-frequency Distribution and Text Statistics. - Hajime Tsubaki (NLPIR, 2019)