1. School of Computer Science, University of St. Andrews, Fife, United Kingdom
2. Graduate School of Culture Technology, KAIST, Daejeon, Republic of Korea
3. Cheriton School of Computer Science, University of Waterloo, Waterloo, Canada
4. Department of Industrial Design, KAIST, Daejeon, Republic of Korea
5. Department of Computer Science, Tokyo Institute of Technology, Tokyo, Japan