Youngjae Park and Hyungdae Kim, "Twisted tape", 10-2017-0081218, Jun. 2017.
Youngjae Park and Hyungdae Kim, "Heat exchanger for condensing tank and passive emergency cooling system in pressurized light water reactor", 10-2015-0122523, Aug. 2015.
Youngjae Park and Hyungdae Kim, "Nuclear reactor pressure vessel, modifying method of surface of nuclear reactor pressure vessel and movable type apparatus for modifing surface of the same", KR101651576B1, Aug. 2015.