About the Authors

Woo Jin Lee

Affiliation Department of Information and Industrial Engineering, Yonsei University, 134 Shinchon-dong, Seoul 120-749, Republic of Korea

Won Kyung Lee

Affiliation Department of Information and Industrial Engineering, Yonsei University, 134 Shinchon-dong, Seoul 120-749, Republic of Korea

So Young Sohn

sohns@yonsei.ac.kr

Affiliation Department of Information and Industrial Engineering, Yonsei University, 134 Shinchon-dong, Seoul 120-749, Republic of Korea

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceptualization: WJL SYS. Data curation: WJL. Formal analysis: WJL SYS. Funding acquisition: SYS. Investigation: WJL WKL SYS. Methodology: WJL SYS. Project administration: SYS. Supervision: SYS. Validation: WJL WKL SYS. Visualization: WKL. Writing – original draft: WJL SYS. Writing – review & editing: WKL SYS.