¡Ý Associate Professor, Department of Physics and Astronomy, Seoul National University, Seoul, Korea, 2011 Sep. - present
¡Ý Professor, Department of Materials Science & Engineering, Gwangju Institute of Science &
    Technology, Gwangju, Korea, 2004 June - 2011 Aug.
¡Ý Postdoctoral Researcher, Prof. Mark Reed's Group, Department of Electrical Engineering, Yale University,  New Haven, Connecticut, USA, 2000 - 2004 May

¡Ý Molecular Electronics: Molecular scale charge transport, conduction mechanism, interaction of charge  carrisers with molecules, contact effect, energy band structure.
¡Ý Organic (polymer) non-volatile memory devices, Flexible electronics
¡Ý Nanowire field effect transistors, logic circuits
¡Ý Graphene-electrode optoelectronic devices

¡Ý Hyunwook Song et al."Observation of Molecular Orbital Gating", Nature, Vol. 462, page 1039-1043, (2009). (Issue of December 24, 2009).  [PDF]   [Journal link]
¡Ý Gunuk Wang et al."New approach for molecular electronic junctions with multi-layer graphene electrode", Advanced Materials,  Volume 23 Issue 6, Pages 755-760 (2011)   [PDF]   [Journal link]
¡Ý Byungjin Cho et al."Rewritable Switching of One Diode–One Resistor Nonvolatile Organic Memory Devices", Advanced Materials, Volume 22 Issue 11, Pages 1228 - 1232 (2010).  [PDF]   [Journal link]
¡Ý Sunghoon Song et al."Three-dimensional integration of organic resistive memory devices",  Advanced Materials, 22, 5048-5052 (2010).  [PDF]   [Journal link]
¡Ý Sunghoon Song et al."Three-dimensional integration of organic resistive memory devices",  Advanced Materials, 22, 5048-5052 (2010).  [PDF]   [Journal link]
¡Ý Gunho Jo et al. ¡°Hybrid Complementary Logic Circuits of One-Dimensional Nanomaterials with Adjustment of Operation Voltage¡±, Advanced Materials, Volume 21 Issue 21, Pages 2156 - 2160 (2009).  [PDF]  [Journal link]
¡Ý Tae-Wook Kim et al."One Transistor–One Resistor Devices for Polymer Non-Volatile Memory Applications", Advanced Materials, Volume 21 Issue 24, Pages 2497 - 2500 (2009).  [PDF]   [Journal link]
¡Ý Woong-Ki Hong et al. ¡°Tunable Electronic Transport Characteristics of Surface Architecture-Controlled ZnO Nanowire Field Effect Transistors", Nano Lett. 8,950-956 (2008).   [PDF]   [Journal link]