1. SK Hynix, Icheon-si, South Korea
2. Samsung Electronics, Hwaseong-si, South Korea
3. the Department of Electrical and Electronic Engineering, and the, Graduate Program in Intelligent Semiconductor Technology, Department of System Semiconductor Engineering, Yonsei University, Seoul, South Korea
4. Department of Electrical and Computer Engineering and the Inter-University Semiconductor Research Center, Seoul National University, Seoul, South Korea