1. Flash Process Architecture Team, Samsung Electronics Company, Hwaseong, South Korea
2. Flash Product and Technology, Samsung Electronics Company, Hwaseong, South Korea
3. Department of Semiconductor and Display Engineering, Sungkyunkwan University, Suwon, South Korea
4. Samsung Institute of Technology, Samsung Electronics Company, Yongin, South Korea
5. Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, South Korea