Urgent question detection based on the review points and sentiment words. - Koji Wajima; Tetsuji Satoh (iiWAS, 2015)

Evaluation of Japanese Text Characteristics with Simplified Corpora using Base Selection. - Koji Wajima; Kei Kogure; Toshihiro Furukawa; Tetsuji Satoh (iiWAS, 2018)

Extract of Japanese Text Characteristics of Simplified Corpora using Non-negative Matrix Factorization. - Koji Wajima; Kei Koqure; Toshihiro Furukawa; Tetsuji Satoh (J. Data Intell., 2020)