The talk is composed of two topics; one is about Ultra-High Energy
Cosmic Rays (UHECRs) and the other is about Supernova Remnants (SNRs).
As for the UHECR part, first I will present simulations of propagation
of UHE-protons from nearby bright galaxies taking account of
extra-galactic magnetic fields and galactic ones. Next I will present
numerical study on the propagation of UHE-Nuclei in a cluster of
galaxies. Finally, I will discuss the possible contributions of past
Gamma-Ray Bursts in Milky Way to the spectrum and composition of UHECRs
around/below 3E+19eV. As for the SNR part, I will discuss our motivation
to study SNRs, what we have done for the study of supernova explosion
and explosive nucleosyhtnesis, and what we plan to do for the study of
supernova remnants. Some preliminary results of our SNR study are also
presented.