[1]Graduate School of Knowledge Based Technology and Ener~, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si,Gyeonggi-do 15073, Korea [2]President of Korea Association for Natural Gas Vehicles (KANGV), 2nd Floor KOGAS, 340 Gonghang-daero, Gangseo-gu, Seoul07647, Korea;
[1]Graduate School of Knowledge Based Technology and Ener~, Korea Polytechnic University, 237 Sangidaehak-ro, Siheung-si,Gyeonggi-do 15073, Korea [2]President of Korea Association for Natural Gas Vehicles (KANGV), 2nd Floor KOGAS, 340 Gonghang-daero, Gangseo-gu, Seoul07647, Korea;