I currently work on a broad range of research in high energy physics, gravitation, and cosmology. In particular, I mainly focus and interest on three topics as 1. large-Nc QCD operator analysis and chiral effective field theory in hadron physics 2. connection between low-energy particle (and nuclear) physics and beyond the standard model of particle physics (e.g., AdS/CFT, grand unified theories, and etc.) 3. modified theories and quantum effects of gravity in cosmology and compact objects.