Funding for this research was provided by:
Institute for Information and Communications Technology Promotion (IITP-2018-2016-0-00309-002)
the National Research Foundation of Korea by the Korea government (NRF-2017R1A2A2A05001046)
Article History
Received: 25 July 2019
Revised: 28 April 2020
Accepted: 15 June 2020
First Online: 28 July 2020