Impacts of Overlay Topologies and Peer Selection on Latencies in IoT Blockchain Koki Koshikawa, Yue Su, Jong-Deok Kim, Won-Joo Hwang, Zhetao Li, Kien Nguyen, and Hiroo Sekiya IEEE Transactions on Network and Service Management , vol.None, no.None, p.None, May 2026. [Abstract | pdf] High-Frequency Self-Synchronized Load-Independent Class-E Rectifier Using Fixed-Point Crossing Detection Wenqi Zhu, Ayano Komanaka, Yutaro Komiyama, Kien Nguyen, Hirotaka Koizumi, and Hiroo Sekiya IEEE Transactions on Power Electronics, vol.41, no.1, pp.1461-1474, Jan. 2026. [Abstract | pdf]