My research interests include the origin of the elements and some related topics such as the mechanism of supernova explosions and cosmic chemical evolution. In particular, I am interested in the r-process, which is responsible for the production of a half of the elements heavier than iron such as silver, gold, platinum, and uranium. I have been studying nucleosynthesis in supernovae as well as Galactic chemical evolution to identify the astrophysical origin of the r-process species.