| 2025 | CHI | Performance or Governance? Serious Game and Workshop as a Tool for Fostering Awareness of Responsible AI. | Hirotaka Kaji, Jun Kuribayashi, Hikaru Ohtani, Arisa Ema |
| 2025 | GECCO | Hiding Structure of Reconstructed Network from Subgraphs Using Evolutionary Multi-Objective Optimization. | Hirotaka Kaji, Toshihiro Tanizawa |
| 2024 | SMC | User Clustering for Pairwise Comparison with Missing Values Using Bradley-Terry Model and Consensus Clustering. | Hirotaka Kaji |
| 2020 | IJCAI | Binary Classification from Positive Data with Skewed Confidence. | Kazuhiko Shinoda, Hirotaka Kaji, Masashi Sugiyama |
| 2019 | ICASSP | Binary Classification Only from Unlabeled Data by Iterative Unlabeled-unlabeled Classification. | Hirotaka Kaji, Masashi Sugiyama |
| 2019 | IJCAI | Daytime Sleepiness Level Prediction Using Respiratory Information. | Kazuhiko Shinoda, Masahiko Yoshii, Hayato Yamaguchi, Hirotaka Kaji |
| 2018 | ICASSP | Multi Task Learning with Positive and Unlabeled Data and its Application to Mental State Prediction. | Hirotaka Kaji, Hayato Yamaguchi, Masashi Sugiyama |
| 2016 | ICONIP | Sleep Stage Prediction Using Respiration and Body-Movement Based on Probabilistic Classifier. | Hirotaka Kaji, Hisashi Iizuka, Mitsuo Hayashi |
| 2009 | CEC | Uncertainty of constraint function in Evolutionary Multi-objective Optimization. | Hirotaka Kaji, Kokolo Ikeda, Hajime Kita |
| 2009 | CEC | Avoidance of constraint violation for experiment-based evolutionary multi-objective optimization. | Hirotaka Kaji, Kokolo Ikeda, Hajime Kita |
| 2008 | CEC | Acceleration of parametric Multi-objective Optimization by an initialization technique for Multi-Objective Evolutionary Algorithms. | Hirotaka Kaji, Kokolo Ikeda, Hajime Kita |
| 2007 | CEC | Acceleration of Experiment-Based Evolutionary Multi-objective Optimization of internal-combustion engine controllers using fitness estimation. | Hirotaka Kaji, Hajime Kita |
| 2007 | EMO | Individual Evaluation Scheduling for Experiment-Based Evolutionary Multi-objective Optimization. | Hirotaka Kaji, Hajime Kita |
| 2007 | EMO | Acceleration of Experiment-Based Evolutionary Multi-objective Optimization Using Fitness Estimation. | Hirotaka Kaji, Hajime Kita |