1992 - 1995Researcher, High Energy Accelerator Research Organization, Japan
1995 - 1998Researcher, Seoul National University, Korea
1998 - Professor, Department of Physics, Sejong University
2005 - 2006Visiting Scholar, Columbia University
2013 - 2013Visiting Scholar, Lawrence Livermore National Laboratory
2013 - Director, Center for Underground Physics IBS
Major Publication
Lifetime measurement of (Lambda)C-12, (Lambda)Si-28, and (Lambda)Fe hypernuclei, Phys. Rev. Lett. 81 (1998) 4321
Limits on WIMP-nucleon cross section with CsI(Tl) crystal detectors, Phys. Rev. Lett. 99 (2007) 091301
Scintillator-based detectors for dark matter searches I, New J. Phys. 12 (2010) 075003
Observation of reactor electron antineutrino disappearance in the RENO Experiment, Phys. Rev. Lett. 108 (2012) 191802
New limits on interactions between weakly interacting massive particles and nucleons obtained with CsI(Tl) crystal detectors, Phys. Rev. Lett. 10 (2012) 181301
Tests on NaI(Tl) crystals for WIMP search at the Yangyang Underground Laboratory, Astro. Part. Phys. 62 (2015) 249