'Phags-pa script
In 1988 Junast was invited to teach in Japan, and he accepted a position as visiting professor at the Tokyo University of Foreign Studies, where he remained until the mid-2000s. In 1994 he retired from the Chinese Academy of Social Sciences, but he continued to publish articles on the 'Phags-pa script, and was engaged in research on the computerization of the 'Phags-pa script.