Sandia Energy > Programs > Electric Grid > Advanced Grid Modeling > Staff > Hyungjin Cho Ph.D. Hyungjin Choi Ph.D. Senior Member of Technical Staff Contact Information Hyungjin Choi / 505-884-8604 Biography Hyungjin Choi received the Ph.D. degree in Electrical Engineering from University of Minnesota in 2017 focusing on convex optimization approaches for transient stability and uncertainty propagation in power systems. Before joining Sandia, he worked as a software engineer at Siemens Digital Grid on developing transmission network applications for energy management system and energy market management system products. From 2017-2018, he worked as a postdoctoral research associate at the University of Illinois, Urbana Champaign, on stability of a microgrid cybersecurity. He is currently serving as a senior member of technical staff in Energy Storage Technology and Systems group at Sandia National Laboratories, mainly focusing on modeling, optimization, and control of power system operation with energy storage systems. Education Ph.D., Electrical and Computer Engineering, University of Minnesota Bachelors of Science, Electrical and Electronics Engineering, INHA University, Incheon, South Korea Google Scholar: Hyungjin Choi Key Publications 2020 H. Choi, U. Vaidya, and Y. Chen, “A convex data-driven approach for nonlinear control synthesis,” arXiv: 2006.15477, 2020. 2019 H. J. Liu, H. Choi, P. Buason, and A. Valdes, “Probabilistic bounds on the impact of potential data integrity attacks in microgrids,” Proceedings of the 52nd Hawaii International Conference on System Sciences, 2019. P. Buason, H. Choi, A. Valdes, and H. J. Liu, “Cyber-physical systems of microgrids for electrical grid resiliency,” IEEE International Conference on Industrial Cyber Physical Systems (ICPS), pp. 492–497, 2019. 2018 H. Choi and S. Bose, “Transient stability analysis of power systems using Koopman operators,” Preprint, 2018