About the Authors

Min-Joo Kang

Affiliation The Department of Electronics Engineering, Ewha W. University, Seoul, Republic of Korea

Je-Won Kang

jewonk@ewha.ac.kr

Affiliation The Department of Electronics Engineering, Ewha W. University, Seoul, Republic of Korea

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MJK JWK. Performed the experiments: MJK JWK. Analyzed the data: MJK JWK. Contributed reagents/materials/analysis tools: MJK JWK. Wrote the paper: MJK JWK.