1. Semiconductor Integrated Metrology Team, Advanced Instrumentation Institute, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Daejeon, South Korea
2. Department of Science of Measurement, University of Science and Technology, 217 Gajeong-ro, Daejeon, South Korea
3. Department of Advanced Materials Engineering, Daejeon University, 62 Daehak-ro, Daejeon, South Korea