Introduction - If you have any usage issues, please Google them yourself
Department of Teacher Training in Electrical Engineering, King Mongkut s University of Technology North Bangkok, 1518, Piboolsongkram Road, Bangsue, Bangkok 10800, Thailand
b Groupe de Recherche en Electrotechnique et Electronique de Nancy (GREEN: UMR 7037), CNRS, Nancy Université, INPL-ENSEM 2, avenue de la Forêt de Haye, Vandœ uvre-lés-Nancy, Lorraine 54516, France
Received 9 October 2008, Revised 18 November 2008, Accepted 23 December 2008, Available online 8 January 2009