Prof. Surendra Dhaka [ 2005.06 ~ 2005.08 & 2007.05 ~ 2007.07 & 2016.05 ~ 2016. 07 ]
# University of Delhi, India
Dr. Hye-Kyung Cho [ 2006.09 ~ 2007.09 ]
Dr. Narendra Singh [ 2008.08 ~ 2009.08 ]
# Aryabhatta Research Institute, India
Dr. Seung-Hee Kim [ 2011.02 ~ 2012.03 ]
# Chapman University, USA
Dr. Silvio Kalisch [ 2012.10 ~ 2012.11 & 2015.10 ~ 2015.12 ]
# Juelich Research Center, Germany
Dr. Bruno Ribstein [ 2015.05.11 ~ 2015.05.31 ]
# Goethe-University Frankfurt, Germany