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서방형 이산화염소 가스를 이용한 이슬송이버섯의 저장 중 품질 변화
윤영태,봉소정,강한솔,윤예지,김홍길,민경훈,이경행,Yoon, Young-Tae,Bong, So-Jung,Kang, Han-Sol,Yoon, Ye-Ji,Kim, Hong-Gil,Min, Kyung-Hun,Lee, Kyung-Haeng 한국식품영양학회 2016 韓國食品營養學會誌 Vol.29 No.4
To improve the shelf-life of mushrooms, Lentinula edodes GNA01 mushrooms were treated with gel packs containing slow-released chlorine dioxide ($ClO_2$) gas at 5~10 ppm for 5 days at $20^{\circ}C$ and the weight loss rate as well as the changes in pH, color and texture properties of the treated samples were investigated. The weight of the control and $ClO_2$ gas treated samples were decreased slightly, and there were no differences during the storage period. However, the weight of the control changed faster than those of the $ClO_2$ gas treated samples during storage period. The pH in the control and in the $ClO_2$ gas treated samples were decreased during storage period, but the samples treated with 5 and 7 ppm $ClO_2$ gas were the least changed. On the other hand, the samples treated with 10 ppm $ClO_2$ gas showed no difference from the other treatments during 4 days, but the pH was lower than that of the control on the fifth day. The lightness of inside and outside in mushroom were decreased whereas redness and yellowness were increased during storage period. However, color changes in the $ClO_2$ gas treated samples were lower than those of the control. Especially, the samples treated with 5 and 7 ppm $ClO_2$ gas were the least changed. The texture of the mushroom were decreased consistently during storage period. The texture of the control changed faster than those of the $ClO_2$ gas treatments during 5 days. Especially, the samples treated 5 ppm $ClO_2$ gas were the least changed.
서방형 이산화염소 가스 젤팩을 이용한 딸기의 저장 중 품질 변화
이경행 ( Kyung-haeng Lee ),봉소정 ( So-jung Bong ),윤예지 ( Ye-ji Yoon ),이봄 ( Bom Lee ),곽일환 ( Il-hwan Kwak ),민경훈 ( Kyung-hoon Min ),김홍길 ( Hong-gil Kim ) 한국식품영양학회 2017 韓國食品營養學會誌 Vol.30 No.3
To prolong the shelf-life of strawberry, samples were treated with gel packs containing slow-released chlorine dioxide (ClO<sub>2</sub>) gas at 3~7 ppm for 6 days at room temperature. The weight loss and decay ratio as well as changes in pH, color and texture properties of the treated samples were investigated. The weight of the control and ClO<sub>2</sub> gas treated samples decreased slightly, but the weight of the control changed faster than those of the ClO<sub>2</sub> gas treated samples during the storage period. The decay ratio of control was higher than those of the ClO<sub>2</sub> gas treatments since 4 days of storage. The pH and acidity in the control and in the ClO<sub>2</sub> gas treated samples were no differences during storage period. The lightness of strawberry decreased during storage, but there was no difference in lightness among the treatments even when storage time was extended. The redness and yellowness of the control showed higher change than those of the ClO<sub>2</sub> gas treatments during 6 days. The firmness of the control changed more rapidly than those of the ClO<sub>2</sub> gas treatments during 6 days. Especially, the samples treated 3 and 5 ppm ClO<sub>2</sub> gas were the least changed. And the scores for appearance, firmness and overall acceptance control and 7 ppm ClO<sub>2</sub> gas treatment decreased more rapidly than those of 3 and 5 ppm treatment.
서방형 이산화염소 가스 젤팩을 이용한 딸기저장 중 주요 성분 및 항산화 활성의 변화
이경행 ( Kyung-haeng Lee ),윤예지 ( Ye-ji Yoon ),이봄 ( Bom Lee ),봉소정 ( So-jung Bong ),김현경 ( Hyun-kyoung Kim ),곽일환 ( Il-hwan Kwak ),김홍길 ( Hong-gil Kim ) 한국식품영양학회 2017 韓國食品營養學會誌 Vol.30 No.4
To increase the shelf-life of strawberry, samples were treated with two gel packs containing slow-released chlorine dioxide (ClO2) gas at 3~5 ppm for 6 days at room temperature and the changes in the major chemical components (ascorbic acid, polyphenols, flavonoids and anthocyanin) contents and antioxidative activities (DPPH, ABTS radical scavenging and metal chelating activity) were investigated. The content of ascorbic acid of control was 40.38 mg% and contained 35.67~44.75 mg% during 6 days. There was no tendency to increase or decrease during storage period. The contents of ascorbic acid of control and 3~5 ppm ClO<sub>2</sub> gas treated samples were not significantly different during storage period. The content of polyphenol compounds of initial stage was 111.23 mg% and contained 117.78~132.40 mg% during 6 days. The contents of polyphenol compounds of 3~5 ppm ClO<sub>2</sub> gas treated samples were 103.51~130.25 mg%. There were no significant different between them during storage. The flavonoids and anthocyanin contents were not different from the control during storage period regardless of 3~5 ppm ClO<sub>2</sub> gas treatment. Furthermore, antioxidative activities were not different among the control and ClO<sub>2</sub> gas treatments during storage.
허소정(Heo, So-Jung),김민성(Kim, Min-Seong),한형석(Han, Hyung-Suk),정의봉(Jeong, Weui-Bong) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.10
The refrigerant after the expansion valve interchanges the heat at the evaporator. At this moment, the state of gas and liquid becomes two-phase flow and causes irregular noise. In order to avoid the noise, the two-phase flow pattern should be predicted. In this paper, the procedure to predict the two-phase flow patterns such as churn flow and annular flow was suggested using the CFD software. The experiments using refrigerant-supplying equipment was carried out and the noise levels according to the flow pattern were measured. The flow patterns predicted by this procedure showed good agreement with those by experiments. The churn flow is noisier than annular flow pattern.
위상 기준 스펙트럼을 이용한 드럼 세탁기 탈수 행정시의 가진력 및 방사소음 예측
김태형(Kim, Tae Hyeong),정병규(Jung, Byung Kyoo),허소정(Heo, So Jung),정의봉(Jeong, Weui Bong) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.7
Accurate prediction of the radiated noise is important to reduce the noise of the washing machine. It is also necessary to predict the excitation force accurately because excitation force can induce noise. In order to predict the excitation force acting on the washing machine, this paper conducts source identification method by use of phase reference spectrum. In this method, the transfer function between the cabinet and the motor through FEM and the measured response from the surface of the cabinet is used. The analysis of the radiation noise from the identified exciting force has been investigated. The comparison between the predicted SPL and the measured SPL at 1m apart from the front side of the washing machine showed good tendency.