Funding for this research was provided by:
Korea Institute of Energy Technology Evaluation and Planning (20172010105590)
Korea Electric Power Corporation (R17GA08)
Article History
Received: 2 January 2019
Revised: 20 March 2019
Accepted: 15 April 2019
First Online: 6 May 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.