7 th International Science, Social Sciences, Engineering and Energy Conference 24-26 November, 2015, Wangchan Riverview Hotel, Phitsanulok, Thailand I-SEEC 2015 http// iseec2015.psru.ac. th Click here, type the title of your paper, capitalize first letters Author1 Surname a,e1 , Author2 Surname b,e2 , Author3 Surname c,e3 a Author1’s affiliation, address, country b Author2’s affiliation, address, country, c Author1’s affiliation, address, country e1 Author1’s email , e2 Author2’s email , e3 Author3’s email Abstract Click here and insert your abstract text. Keywords: Type your keywords here, separated by semicolons