Commercial direct refrigerators have good energy efficiency, but are difficult to use for supercooled storage due to their large temperature deviation. Placing insulators and conductors inside the refrigerator could reduce these temperature deviations to within 0.3 degrees, allowing for the supercooled storage. The supercooled storage of salted Chinese cabbages during ten weeks was progressed to compare the other low temperature storages. The nucleation temperatures of salted Chinese cabbage were around -2.5oC and the freezing points were around -0.4oC, so -2oC was selected for the supercooled storage. The growth rate of lactic acid bacteria and yeast at -2oC storage was lower than that at 2oC storage. The reducing sugar was maintained higher due to the growth rate of lactic acid bacteria. The supercooled storage had an effect of delaying the fermentation of the salted Chinese cabbage, which may have the effect of delaying the fermentation of kimchi. This enhancement method of the direct refrigerator was effective for the supercooled storage and would be promising for commercial use.

Abstract
서 론
재료 및 방법
    직냉식냉장고의 온도측정
    직냉식 냉장고의 냉각코일 인근 온도편차 완화
    직냉식 냉장고의 위치별 온도편차 완화
    절임배추의 과냉각 저장
    이화학적 품질 특성
    미생물학적 품질 특성
    통계분석
결과 및 고찰
    직냉식냉장고의 온도편차 완화
    절임배추의 이화학적, 미생물학적 품질분석
요 약
References

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• 남소영(농촌진흥청 국립농업과학원 농업공학부) | Soyoung Nam (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA)
• 정현경(농촌진흥청 국립농업과학원 농업공학부) | Hyun Kyung Jung (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA)
• 손재용(농촌진흥청 국립농업과학원 농업공학부) | Jae Yong Son (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA)
• 최동수(농촌진흥청 국립농업과학원 농업공학부) | Dong Soo Choi (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA)
• 김용훈(농촌진흥청 국립농업과학원 농업공학부) | Yong Hoon Kim (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA)
• 이수장(농촌진흥청 국립농업과학원 농업공학부) | Soo Jang Lee (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA)
• 박천완(농촌진흥청 국립농업과학원 농업공학부) | Chun Wan Park (Department of Agricultural Engineering, National Institute of Agricultural Sciences, RDA)
• 김하윤(농촌진흥청 국립농업과학원 농식품자원부) | Ha Yoon Kim (Department of Agro-food Resources, National Institute of Agricultural Sciences, RDA)
• 박석호(농촌진흥청 시설원예연구소) | Seok Ho Park (Protected Horticulture Reaearch Insitute, National Institute of Horticultural and Herbal Science, RDA)