Young-Joo Kim received Ph. D degrees in computer science from Gyeongsang National University, South Korea, in February 2007. Since September 2007, he had been working for KAIST (South Korea) and Texas A&M University (USA) as research professor and visiting scholar. Currently he is a senior researcher at Electronics and Telecommunications Research Institute (ETRI) in South Korea. His main areas of research interest are debugging technology and power analysis in embedded systems, parallel/distributed systems, and wireless sensor networks.