Self-beating gel pump powered by chemical energy. - Koki Takahashi; Sumito Nagasawa; Shingo Maeda (IROS, 2013)

Active gel locomotion. - Shingo Maeda; Terukazu Kato; Koki Takahashi; Shuji Hashimoto (MHS, 2013)

A Common Ground Five-Level Inverter Using Switched Capacitor. - Kazunori Ito; Koki Takahashi; Hirotaka Koizumi (IECON, 2019)

Weighted LDA Using Metadata for Extracting Topics Needed by Teachers. - Koki Takahashi; Ryosuke Harakawa; Masaki Iisaka; Masahiro Iwahashi (GCCE, 2020)

Hierarchical Clustering of Natural Disaster Images Using Visual Features. - Ryosuke Harakawa; Kazuma Ohtomo; Koki Takahashi; Yoko Matsuda; Masahiro Iwahashi (LifeTech, 2021)

Skeleton Features-based Drowsiness Detection for a Semi-Autonomous Driving System in Real Road Conditions. - Koki Takahashi; Mika Sunagawa; Shin-ichi Shikii; Mototaka Yoshioka (GCCE, 2022)

Dashcam-Based Driver Monitor for Semi-Autonomous Driving. - Mika Sunagawa; Koki Takahashi; Shin-ichi Shikii; Mototaka Yoshioka (ICCE, 2023)

Eye-Gaze Interface Using Subtle Facial Gestures for Frequent Interaction with Augmented Reality Glasses. - Koki Takahashi; Mika Sunagawa; Aki Yoneda; Sho Furubayashi (ICCE, 2025)

Channel Resolvability Using Multiplicative Weight Update Algorithm. - Koki Takahashi; Shun Watanabe (CoRR, 2025)