Funding for this research was provided by:
Korea Institute of Science and Technology Information (No. K-17-L01-C03-S03)
Ministry of Education of the Republic of Korea and the National Research Foundation of Korea (NRF-2017S1A3A2066319)
Article History
Received: 26 January 2018
Revised: 19 June 2018
Accepted: 17 July 2018
First Online: 25 July 2018