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Author(s):Luechai Promratrak* 64 Udon Thani Rajabhat University, Thahan Rd., Muang, Udon Thani, 41000, Thailand International Journal of Smart Grid and Clean Energy, vol. 6, no. 2, April 2017: pp. 133-140 ISSN: 2315-4462 (Print) ISSN: 2373-3594 (Online) Digital Object Identifier: 10.12720/sgce.6.2.133-140