MPBEL (Medical Physics and Biomedical Engineering Lab) :  http://mpbel.yonsei.ac.kr/

KSMP (Korean Society of Medical Physics):  http://www.ksmp.or.kr/

KOSRO (The Korean Society of Radiation Oncology): https://www.kosro.or.kr/

AAPM (American Association : https://www.aapm.org/

ASTRO (American Society for Radiation Oncology): https://www.astro.org/