Hyo-Sik Yang received a B.E. degree in information and communication engineering from Myongji University, Yongin, Korea, in 1998 and M.S. and Ph.D. degrees in electrical engineering from Arizona State University, Tempe, AZ, USA, in 2000 and 2005, respectively. Currently, he is a Professor in the Department of Computer Science and Engineering, Sejong University, Seoul, Korea. Before he joined Sejong University, he was an Assistant Professor at Kyungnam University, Masan, Korea. He joined Sejong University in 2006. He served as a Faculty Research Associate at Arizona State University until 2005. He is a member of IEC TC 57 WG10 and IEC SyC Smart City and Smart Energy. His research interests include wavelength-division multiplexing (WDM); all-optical networks; mobile ad-hoc networks; smart grids, especially on IEC 61850 and communication architecture; and smart cities.