Namkung, Min
Kwon, Younghun
Funding for this research was provided by:
National Research Foundation of Korea (NRF2018R1D1A1B07049420, NRF2015R1D1A1A01060795)
Institute for Information & Communication Technology Promotion (IITP) grant funded by the Korea government (MSIP)
Article History
Received: 5 February 2019
Accepted: 25 November 2019
First Online: 23 December 2019
Competing interests
: The authors declare no competing interests.