About the Authors

Junhee Seok

jseok14@korea.ac.kr

Affiliation School of Electrical Engineering, Korea University, Seoul, South Korea

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

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