Profile Information

Affiliation
Senior Lecturer, Tokyo Gakugei University
Degree
Ph.D. (Information Science and Technology)(The University of Tokyo)
Master (Information Science and Technology)(The University of Tokyo)
Bachelor (Engineering)(The University of Tokyo)

Researcher number
60738029
J-GLOBAL ID
201801013547399229
researchmap Member ID
B000303925

External link

I have been studying learning support systems/natural language processing/computational linguistics with a focus on language learner support systems. Primary research interests and accomplishments as of December 2022 are summarized as follows:

1. The relationship between contextualized word embedding, such as BERT [Devlin et al., 2019], and word difficulty

  • A study of extracting word difficulty from contextualized word embeddings without word-difficulty supervision by using outlier detection [Ehara, AIED 2022 (full paper)].
  • A study of extracting learner ability values from contextualized word embeddings from vocabulary test result dataset of second language learners. [Ehara, EDM short2022].

2. Research on Automatic Readability Assessment (ARA) for Second Language Learners

  • Unsupervised (in the sense that no language teachers' costly manual readability labels are used as supervision) Automatic Readability Assessment by using learners' vocabulary test result data [Ehara, ICTAI 2021].

Tenured senior lecturer on Natural Language Processing, especially educational NLP and second language vocabulary acquisition. Built publicly-available datasets on second language vocabulary knowledge: http://yoehara.com/vocabulary-prediction/ .


Major Research Projects

  5

Awards

  10

Major Papers

  42

Major Presentations

  5

Misc.

  5