• 한국잡초학회지
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• 제31권1호
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• pp.78-83
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• 2011

자생잡초인 얼치기완두와 새완두를 피복식물로 이용하기 위해 이들 종자의 저장기간 및 방법, 온도 및 광조건이 발아율에 미치는 영향을 구명하기 위한 시험을 수행하였다. 2004년과 2005년 6월에 충청남도 당진에서 채종하여 일정기간 상온에서 저장한 종자를 $15/5^{\circ}C$, $20/10^{\circ}C$, $25/15^{\circ}C$, $30/20^{\circ}C$(주/야) 조건에서 발아율을 조사하였다. 2004년과 2005년에 얼치기 완두와 새완두 모두 채종후 3개월 동안 상온에서 저장한 후의 발아율은 30% 이하로 낮게 나타났다. 2005년에 채종되어 12개월 상온저장 후 $25/15^{\circ}C$로 처리한 얼치기완두는 82%의 높은 발아율을 보였으며, 시간이 경과함에 따라서 발아율이 증가하는 양상을 나타내었다. 반면에 새완두는 채종 6, 9, 12개월 후에 33%에서 53%의 발아율을 보여 저장기간이 발아율에 별다른 영향을 미치지 않았다. 얼치기완두와 새완두 종자는 저온보다는 상온에서 저장하는 것이 효과적이었으며, 광이나 고온처리가 발아에 영향을 미치지는 않았다.

• 대한한의학회지
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• 제30권2호
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• pp.127-132
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• 2009

Objectives: This study aimed to investigate the stability of a decoction using three herbal plants and their major components according to the storage conditions and periods. Materials and Methods: A three-herb mixture (1:1:1) of Glycyrrhiza uralensis Fischer, Artemisia capillaris Thunberg, and Poncirus trifoliata Rafinesqui was decocted and kept at room temperature ($25{\pm}2^{\circ}C$) or cold temperature ($4^{\circ}C$) for 0, 2, 4 or 8 weeks in liquid form in a plastic pack under dark conditions. At time points given, they were lyophilized. 200 mg of powdered samples were dissolved in 1 mL of 90% methanol and then applied to a high performance thin layer chromatography (HPTLC) with glycyrrhizin, 6,7-dimethoxycoumarin or poncirin for quantitative or qualitative analysis. Results: There were no gross changes in HPTLC-based compositional band-patterns of the three herbal mixture according to the storage conditions and period. The major components of each herb, glycyrrhizin, 6,7-dimethoxycoumarin and poncirin, showed slight time-dependent reduction in their contents both at room and cold temperature for 8 weeks. Conclusion: We could conclude that the current herbal decoction is generally safe for the stability at both RT or CT for at least 8 weeks. Nevertheless, we proposed that further advanced studies are required for more multiple herbal mixtures and longer storage periods.

• 제어로봇시스템학회논문지
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• 제8권11호
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• pp.948-953
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• 2002

The electric power load during the peak time in summer is strongly affected by cooling load, which decreases the preparation ratio of electricity and brings about the failure in the supply of electricity in the electric power system. The ice-storage system and heat pump system are possible solutions to settle this problem. In this study. the method of estimating temperature and humidity to forecast the cooling load of ice-storage system is suggested, then the method of forecasting the cooling load using fuzzy logic is suggested by simulating that the cooling load is calculated using actual temperature and humidity. The forecast of the temperature, humidity and cooling load are simulated, and it is shown that the forecasted data approach to the actual data. Operating the ice-storage system by the forecast of cooling load with night electric power will improve the ice-storage system efficiency and reduce the peak electric power load during the summer season as a result.

• International Journal of Air-Conditioning and Refrigeration
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• 제17권1호
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• pp.32-36
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• 2009

The ice storage system uses water for low temperature latent heat storage. However, a refrigerator capacity is increased and COP is decreased due to supercooling of water in the course of phase change from solid to liquid. This study investigates the cooling characteristics of the TMA-water clathrate compound including TMA (Tri-methyl-amine, $(CH_3)_3N$) of $20{\sim}25wt%$ as a low temperature latent heat storage material. The results showed that the phase change temperature and the specific heat is increased and the supercooling degree is decreased as the weight concentration of TMA increased. Especially, the clathrate compound containing TMA 25 wt% has the average phase change tempera ture of $5.8^{\circ}C$, the supercooling degree of $8.0^{\circ}C$ and the specific heat of 3.499 kJ/kgK in the cooling process. This can lead to reduction of operation time of refrigerator in low temperature latent heat storage system and efficiency improvement of refrigerator COP and overall system. Therefore, energy saving and improvement of utilization efficiency are expected.

• 한국식품과학회지
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• 제27권2호
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• pp.193-198
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• 1995

여러 저장온도($5{\sim}25^{\circ}C$)에서 저장하는 동안의 두부의 물성 변화는 응력완화현상을 이용하여 시간-온도 중첩 이론을 통해 계산하고 분석하였으며 WLF(Williams-Landel-Ferry)식을 이용해서 품질변화를 예측할 수 있는 적용식을 제시하였다. 저장온도가 낮을수록 저장시 두부 조직의 초기응력 및 평형응력(equilibrium stress)이 강하게 나타났고, $15^{\circ}C$ 온도를 기준으로 이동인자를 이용하여 좌우 수평으로 이동시 하나의 중첩곡선(master curve)을 구하였다. 이동인자와 중첩곡선을 이용하여 WLF식에 적용해서 활성화 에너지를 계산하였고 임의 온도에서 저장 시간을 예측하였으며, 실제 두부 조직의 저장성을 논하였다.

• 한국식품영양과학회지
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• 제22권1호
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• pp.73-77
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• 1993

This study was intended to investigate the effects of solvents, particle size of a sample, sample to solvent ratio, temperature and time on the extraction of garlic oleoresin. Among eleven solvents used for oleoresin extraction from garlic, the optimal solvent was methyl alcohol. The most appropriate particle size of garlic, extracting temperature and mixing ratio of garlic to methyl alcohol were 20mesh, $25^{\circ}C$ and 1 to 3(w/w), respectively. On the basis of yield in oleoresin extraction, optimum extracting time was about 4 hours. The yield of oleoresin under the above-mentioned conditions was 21.3%. "L" and "b" as color appearance were decreased, whereas "a"was increased slightly during 60 days storage at 5$^{\circ}C$, $25^{\circ}C$ and 4$0^{\circ}C$. Changes in the pyruvate content showed close relation to pH value. During storage pyruvate content of garlic oleoresin was decreased as increasing storage temperature.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.1663-1666
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• 2003

TMA clathrate that is used by PCM of ice storage system in this research creates hydrate crystallization at higher temperature than pure water, and application is expected as PCM because having comparative big dormant temperature without phase separation phenomenon. In case this research uses TMA clathrate by PCM, choose admixture by purpose to control or remove subcooling of TMA clathrate and evaluated experimentally. Subcooling is improved and can expect contraction of freezing machine running time and increase of coefficient of performance as that add admixture to TMA clathrate conclusively. Also, may supply thermal storage system that apply low temperature potential heat thermal storage material that subcooling is improved more extensively laying stress on medium size building and small size building, can expect allowance through localization of ice storage system.

• 한국식품영양과학회지
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• 제28권3호
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• pp.566-571
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• 1999

Effects of storage temperature at 18oC and 5oC for 9 days and heating conditions on textural char acteristics in strong wheat flour gels were investigated using a Instron after microwave (2450MHz, 700W). Heating condition did not affect the texture property in the wheat flour gels, but the frozen storage was very effective to prevent the hardening of the samples. Hardness, adhesiveness, and gumminess in the wheat flour gels decreased in increasing moisture content from 45% to 55%, but there was little change in cohesiveness. The storage at room temperature for 2 hours resulted in increased hardness in the heated wheat flour gels. PE wrap package of the wheat flour gels prevented weight loss by 3~6% and hardening effectively. Sugar, or sugar and shotening resulted in increased hardness in loaf bread. The hardness and weight loss in loaf breads were markedly changed by the heating time with microwave. The most critical time point was around 4 minutes following the heating.

• International Journal of Air-Conditioning and Refrigeration
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• 제15권4호
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• pp.175-181
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• 2007

A computer model of a high efficiency refrigeration system equipped with heat storage for reverse cycle-hot gas defrost (the stored heat is used during defrost cycle of the system) is presented. The model was developed based on both theoretical and empirical equations for the compressor, evaporator, condenser and the heat storage equipment. Simulations of the prototype system were carried out to investigate refrigeration system performance under various operating conditions during refrigeration cycles. The simulations of the evaporator during defrost cycles at 30 and $40^{\circ}C$ hot gas refrigerant temperature were also performed which resulted on shorter defrost time but only slight increase in defrost efficiency. These information on energy efficiency and the defrost time required are important in order to avoid excessive parasitic load and temperature rise of the refrigerated room.

• 생물환경조절학회지
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• 제21권4호
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• pp.404-410
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• 2012

본 연구는 수출용 딸기 '매향' 품종을 09:00와 14:00에 각각 수확하여 $4^{\circ}C$ 예냉 처리 혹은 예냉 무처리 후 $4^{\circ}C$와 $8^{\circ}C$에 저장하면서 딸기의 품질변화와 상품성 유지 효과를 구명하기 위해 수행되었다. 2010년 5월 4일에 숙도 60%의 과실을 경상남도 진주지역 상업적 온실에서 수확하였다. 농가의 예냉기에서 3시간 동안 예냉한 딸기를 30분 만에 실험실로 수송하고, 즉시 저장고에 저장하였다. 예냉은 농가 현장에 설치되어 있는 간이 예냉기를 이용하였다. 과실은 PVC랩과 골판지상자에 포장 된 후 $4^{\circ}C$와 $8^{\circ}C$의 항온 저장고에 두어 실험하였다. 저장하는 동안 딸기의 무게변화, 경도, 색도, 당도, 잿빛곰팡이 발생률을 이틀 간격으로 2010년 5월 6일부터 5월 14일까지 조사하였다. 숙도가 진행됨에 따라 경도 및 당도가 감소하였다. Hunter 'L'과 'a' 값은 시간이 경과함에 따라 감소하였다. 또한 모든 온도처리에서 저장 기간이 경과함에 따라 무게의 변화가 감소하였다. 과실의 표피조직에 무름병의 발생 시작 후 잿빛곰팡이가 발생하였다. 잿빛곰팡이는 저장온도 $4^{\circ}C$ 처리구에서 보다는 $8^{\circ}C$ 처리구에서 가장 많이 발생하였다. 하지만 수확 시간과 예냉 유무에 따른 저장성의 차이는 나타나지 않았다. 본 연구는 $4^{\circ}C$ 예냉처리 후 $4^{\circ}C$에서 저장하였을 때 신선도가 가장 오래 유지되었다.