1. Postdoctoral Research Fellow, Department of Anesthesiology, University of Michigan Medical School, Ann Arbor, Michigan.
2. Assistant Professor, Department of Management, Chosun University, Gwangju, Korea.
3. Professor, Asia Pacific Center for Theoretical Physics & Nonlinear Complex Systems Laboratory, NCRS-SBD, Department of Physics, POSTECH, Pohang, Korea.
4. Professor and Chair, Department of Clinical Pharmacology and Therapeutics, Department of Anesthesiology and Pain Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Anesthesiology and Pain Medicine, National Medical Center, Seoul, Korea.
6. Assistant Professor of Anesthesiology and Neurosurgery, Director, Division of Neuroanesthesiology, Associate Director, Anesthesiology Residency Program, University of Michigan Medical School.