Development of a Light-Emitting Sword Tip Accompanying Thrusts and a Device for Judging Valid Thrusts by Light Spectrum Detection Without an Electric Judge in the Foil Event of Fencing Competitions. - Seira Aguni; Tetsuo Nishikawa; Kaito Fujita; Ren Nakanishi; Yumi Asahi (HCI (5), 2023)