Joon-Shik Park received his B.S., M.S., and Ph.D degrees in Materials Science and Engineering from Hanyang University, Seoul, Rep. of Korea in 1992, 1994, and 2004, respectively. Since 1994, he have researched piezoelectric micro actuators, micro and nano gas sensors, micro fluidic devices for micro TAS, flexible sensors, and smart band for physiological signal monitoring as a principal researcher at Korea Electronics Technology Institute (KETI) in Rep. of Korea. From August 2007 to August 2009, he researched electrical and optical properties of individual Ge nanowires synthesized using VLS mechanism as a visiting scholar at Dept. of Materials Science and Engineering of Stanford University