So Pyong Hwa successfully solved difficult and complicated scientific and technical problems arising in important construction projects including large-scale hydro-power station, tideland, harbor and river and irrigation projects wrote many textbooks, reference books and papers and trained his students as competent holders of academic degrees.

Leader Kim Jong Il and Kim Jong Un invited him to attend national conferences including national conference of scientists and technicians and bestowed upon him the honor of being recipients of state commendations.

Born in an alien land, Pak Ryong Ung devoted himself to the education of students and scientific and researches for decades.

He devoted all his wisdom and energy to the work for publishing books "Complete Book on Kimilsungia" and "Complete Book on Kimjongilia" of national value and researches into the wide dissemination of immortal flowers so that they are kept in full bloom.