Sleep Stage Prediction Using Respiration and Body-Movement Based on Probabilistic Classifier. - Hirotaka Kaji; Hisashi Iizuka; Mitsuo Hayashi (ICONIP (1), 2016)

ECG-Based Concentration Recognition With Multi-Task Regression. - Hirotaka Kaji; Hisashi Iizuka; Masashi Sugiyama (IEEE Trans. Biomed. Eng., 2019)