| 2018 | SMC | Driving Assistance of Welfare Vehicle with Virtual Platoon Control Method which has Collision Avoidance Function Using Mixed Reality. | Nobutomo Matsunaga, Ryota Kimura, Haruya Ishiguro, Hiroshi Okajima |
| 2018 | SMC | Inter-Vehicle Distance Stabilization in Adaptive Cruise Control Using Signal Limitation Filter. | Yuta Nakabayashi, Hiroshi Okajima, Nobutomo Matsunaga |
| 2016 | SMC | Providing safe and affordable transportation to reduce female students dropout: A case study on college girls in rural Bangladesh. | Nuren Abedin, Jecinta Kamau, Hironobu Kitaoka, Hiroshi Okajima, Masaharu Okada, Akira Fukuda, Ashir Ahmed |
| 2016 | SMC | Demand Responsive Mobility as a Service. | Jecinta Kamau, Ashir Ahmed, Andrew Rebeiro-Hargrave, Hironobu Kitaoka, Hiroshi Okajima, Zahidul Hossein Ripon |
| 2015 | ICIP | Optimization of color quantization with total luminance for DLP projector and its evaluation system. | Gou Koutaki, Hiroshi Okajima, Nobutomo Matsunaga, Keiichi Uchimura |
| 2015 | IECON | Robust and precise platoon driving control of welfare vehicles along wheel track by using model error compensator. | Tatsuya Sugano, Hiroshi Okajima, Nobutomo Matsunaga |
| 2014 | SMC | Villager centered transport system in unreached communities. | Jecinta Kamau, Andrew Rebeiro-Hargrave, Emran Abdullah, Rafiqul Islam Maruf, Kunihiro Nobuhara, Hiroshi Okajima, Ashir Ahmed |