Comparative Study of Bi-Layer and Tri-Layer Oxide Structures in Synaptic Devices. - Dong-Min Kim; Yu-Bin Kim; Chae-Min Yeom; Sung-Ho Kim; Young-Su Kim; Yong-Goo Kim; Hyuk-Min Kwon; Shivam Kumar Gautam; Hi-Deok Lee (IEEE Access, 2026)