Funding for this research was provided by:
National Research Foundation of Korea (2019R1I1A1A01060653, 2018R1A2A1A05079100)
Ministry of Trade, Industry and Energy (20010566)
Text and Data Mining valid from 2021-02-12
Version of Record valid from 2021-02-12
Article History
Received: 25 September 2020
Accepted: 2 February 2021
First Online: 12 February 2021
Competing interests
: The authors declare that they have no competing interests.