4:48 PM - 4:49 PM [PS-2-19 (Late News)] Gate-Tuning of Synaptic Functions Based on The Oxygen Vacancy Distribution Control in Four-Terminal TiO2-x Memristive Devices ○Z. Nagata1, T. Shimizu1, T. Isaka1, T. Tohei1, A. Sakai1 (1.Osaka Univ. (Japan))