I am Naomi Tsuji, a postdoctoral researcher at RIKEN/iTHEMS. My major is observational studies of high energy astrophysical phenomena. I have been working on particle acceleration and nonthermal radiation in shock waves of supernova remnants by using X-ray observations. I also analyze TeV gamma-ray data, as a member of H.E.S.S. (High Energy Spectroscopic System) collaboration.