**Author details**

Jun-Sik Yoon, Jinsu Jeong, Seunghwan Lee, Junjong Lee and Rock-Hyun Baek\* Electrical Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea

\*Address all correspondence to: rh.baek@postech.ac.kr

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
