1. School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea
2. Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, South Korea
3. School of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea
4. PI Research Laboratory, SK Hynix Inc, Icheon, South Korea
5. School of Electronics and Electrical Engineering, Dankook University, Gyeonggi, South Korea