A Novel Method for Lightning Prediction by Direct Electric Field Measurements at the Ground Using Recurrent Neural Network. - Masamoto Fukawa; Xiaoqi Deng; Shinya Imai; Taiga Horiguchi; Ryo Ono; Ikumi Rachi; Sihan A; Kazuma Shinomura; Shunsuke Niwa; Takeshi Kudo; Hiroyuki Ito; Hitoshi Wakabayashi; et al. (IEICE Trans. Inf. Syst., 2022)