Corresponding Author

Dae-Shik Seo

IT Nano Electronic Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, Seoul, South Korea

Correspondence Dae-Shik Seo, IT Nano Electronic Device Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, Seodaemun-gu, Seoul 120-749, South Korea.

Email: dsseo@yonsei.ac.kr