Yun, Sŏk-chʻŏl.

• Chŏnja sanggŏrae (EC) rŭl kanŭng hage hanŭn kwahak/kisul ŭi palchŏn kwajŏng
• Intʻŏnet sidae chŏlmŭn sedae rŭl wihan saengjon chʻŏrhak
• Kyeryang kyŏngyŏnghak
• Kyŏngyŏnghakchŏk sago ŭi tʻŭl