Acknowledgements
This study was supported by the Power Generation & Electricity
Delivery of the Korea Institute of Energy Technology Evaluation
and Planning (KETEP) grant funded by the Korea government Ministry
of Knowledge Economy. (No. R-2004-0-098-001) This work
was also supported by Mid-career Researcher Program through
NRF grant funded by the MEST (0498-20110009) contracted
through the IAAT at Seoul National University