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장성강 ( Zhang Cheng-gang ),리신호 ( Rhee Shin-ho ),윤성수 ( Yoon Seong-soo ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
A heating greenhouse early in Joseon Dynasty was restored to the estimated state by the document "sangayorok(1940)" Diagrams of a restored greenhouse was reported. This heating greenhouse is eldest in the world. Growing vegetables in a restored greenhouse the inner temperature and humidity was investigated. This greenhouse was identified as making grow possible.