Vissanu Meeyoo, Mahanakorn University of Technology, 51 Cheum-Sampan Road, Nong-Chok, Bangkok, 10530, Thailand and Pramoch Rangsunvigit, The Petroleum and Petrochemical College, Chulalongkorn University, 254 Soi Chula 12, Phyathai Rd., Patumwan, Bangkok, 10330, Thailand.