Sang C. Lee received B.S., M.S., and Ph.D. degrees in Electrical and Electronics Engineering from Pohang University of Science and Technology, Pohang, Korea, in 1994, 1996, and 2002, respectively. He was a Postdoctoral Researcher with the Centre National de la Recherche Scientifique, Supelec, France. He is currently a Senior Researcher with the Intelligent Robot Division, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Korea. His main research interests are in the modeling and control of an indoor navigation and a transfer robotic system.