Pyongyang, October 23 (KCNA) -- A delegation of Korean social scientists in Japan led by Ri Yong Su, chairman of the Korean Social Scientists Association in Japan, and a home-visiting group of students in their final year at Korean University of the General Association of Korean Residents in Japan (Chongryon) led by Dean of faculty Jo Yong Rae arrived here by air on Oct. 22. -0-