Content-based Stock Recommendation Using Smartphone Data. - Kohsuke Kubota; Hiroyuki Sato; Wataru Yamada; Keiichi Ochiai; Hiroshi Kawakami (J. Inf. Process., 2022)

Stay Ahead of the Competition: An Approach for Churn Prediction by Leveraging Competitive Service App Usage Logs. - Hisao Katsumi; Kohsuke Kubota; Wataru Yamada; Keiichi Ochiai (UbiComp/ISWC Adjunct, 2023)