• 농업과학연구
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• 제25권2호
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• pp.310-320
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• 1998

This study is aimed at identifying the socio-economic effects of storage of ginger in artificial caves. The gingers stored in artificial caves in Seochun, 12 sampled areas, were surveyed to get information on the socio-economic effects. The surveyed data were processed by TSP, Qbasic and B/C Ratio computer programs and analyzed the decision making criteria such as B/C ratio, NPV and IRR. The socio-economic effects of the storages of the gingers are as follows. 1. The storage benefits per ton was showed as 184,050won. 2. Considering 10% of the opportunity cost of capital, the uper limits of investments for the cave storages was analyzed as 6,784 thousand won for ginger. 3. The investment of the natural cave storages was revealed economically feasible considering the decision making criteria as B/C ratio = 1.33, NPV = 35.059 thousand won and IRR = more than 100%. The other socio-economic effects of the ginger storages was expected as ; 1. The cave storages will contribute to increase consumer's and producer's welfare through the control of supply and demand and price stability. 2. Long-term storage of ginger without damaging quality and grades will be made on account of the storage conditions as relatively low temperature, high humidity and indifferent affects from the outside climate. 3. Utilization of the underground space, the caves, for storage will maximize the land use and the sustainable environment considering the mountainous area, two third of the total national land area. 4. Construction costs of the underground storage facilities as caves are cheaper than the ground storage facilities by 15 to 20% in general. In conclusion, the underground space like natural and artificial caves are considered the most suitable for storage of ginger on account of the storage conditions as temperature, humidity and blocking the sun light. Accordingly a study on convenient utilization of new development of artificial caves should be made considering transportation and input-output of the farms. Financial support of the government should be institutionally rearranged for the successful implementation of storing farm products like ginger in natural and man-made caves.

• 한국식품조리과학회지
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• 제19권4호
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• pp.439-446
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• 2003

This study was performed to investigate the change in the chemical components of red pepper powder using different packaging materials and various storage conditions. Red pepper powders with 11 and 15% initial moisture content were packed with five different materials and stored at different temperatures (0, 20, and 30 C) for a one year period. Over the storage period, each combination was periodically sampled, and examined for composition changes. The five packaging materials were: linear low density polyethylene(LLDPE), nylon/LLDPE(Ny/LLDPE), saran coated ethylene vinyl acetate copolymer/linear low density polyethylene(B650), nylon/Tie/nylon/ethylene-vinyl alcohol copolymer/nylon/Tie/LLDPE(RDX-2787) and oriented polypropylene/alumimum/LLDPE(OPP/Al/LLDPE), and the three storage conditions were (28.3${\pm}$1.0)$^{\circ}C$ with (15.5${\pm}$2.8)% relative humidity, (18.6${\pm}$0.5)$^{\circ}C$ with (46.6${\pm}$4.9)% RH, and (0${\pm}$2)$^{\circ}C$ with (80${\pm}$10)% RH, respectively. The moisture contents of all samples changed according to the relative storage humidity, except those of the samples packed with OPP/Al/LLDPE, which remained constant throughout the storage period. The capsaicinoids content of the red pepper powder did not change significantly for 6 months, but gradually decreased after that until about 85% of the original amount remained at the final stage of storage. The ASTA color values of all samples decreased gradually throughout the storage period. The higher the storage temperature, the more severe the deterioration. The color deterioration seemed greatly related to the existence of oxygen, as the deterioration was especially severe in the samples packed with LLDPE and B650, where the oxygen transmission rate were highest among the five packaging materials.

• 한국작물학회지
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• 제29권3호
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• pp.275-279
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• 1984

대두유전자원의 안전보존을 위해서 50계통을 선정하고 온도 23$^{\circ}C$와 습도 60%가 넘지 않도록 유지시킬 수 있는 본 연구소의 저장고에 종자를 저장하면서 계속 일정 간격으로 발아력을 조사하는 한편 동일 계통의 종자를 온도 4$0^{\circ}C$와 습도 90%에서 인공적으로 노화촉진시켜 저장고에서의 발아력감퇴와 비교하였다. 저장초기의 평균발아율이 97%이었는데 반해 저장 42개월에는 62%로 저하되었는데 비교적 본 저장고에서 오랫동안 발아력이 유지된 셈이다. 종자의 크기와 종피색에 따라 발아력 유지의 정도에 차이가 있는 것으로 나타났는데 대립보다 소립 또한 갈색이나 녹색보다 검정색이나 황색 계통에서 발아력 유지가 오래 지속되는 경향을 보였다. 인공노화촉진처리한 후의 계통간 발아력감퇴차이는 저장고에서의 것과 일치하는 것으로 나타났고, 특히 저장전에 계통간 종자 수명을 파악코저 할 때, 온도 4$0^{\circ}C$와 습도 90%에서 7일 처리가 가장 알맞는 것으로 사료된다.

• 한국식품과학회지
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• 제31권1호
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• pp.164-170
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• 1999

저장 중 쌀의 수분이동에 따른 균열현상을 구명하고 균열을 발생시키는 임계조건을 산출하여 이를 토대로 쌀의 균열을 방지할 수 있는 저장조건을 확립하였다. 쌀의 평형상대습도와 노출된 환경의 상대습도의 차이$({\Delta}ERH)$가 적을 때는 균열이 발생하지 않은 반면, 그 차이가 임계치보다 클 때는 균열이 발생하였으며 균열의 발생정도는 쌀의 평형상대습도와 환경의 상대습도의 차이가 클수록 심하게 나타났다. 탈습환경 하에서는 불규칙한 형상의 균열이 쌀알의 외부에 발생하였으며 흡습환경 하에는 규칙적인 형상의 균열이 쌀알의 내부에 축방향과 수직방향으로 방사상으로 발생하였다. 노출시간별 균열발생 패턴을 Weibull함수에 의거하여 해석한 결과, ${\Delta}ERH$가 클수록 균열속도상수가 증가하였다. 동할미 발생률은 In$({\Delta}ERH)$에 따라 직선적으로 증가하였으며, 임계 균열발생 상대 습도차(critical crack-inducing ${\Delta}ERH$)는 탈습시 $11.3{\sim}16.4%$, 흡습시 $10.8{\sim}17.1%$의 값을 보였다. 실험결과를 토대로 수분함량 및 수분활성도 별 쌀의 안전저장 상대습도를 나타내는 diagram을 제시하였다.

• 한국의류학회지
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• 제19권1호
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• pp.36-50
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• 1995

The purpose of this study was 1) to estimate the improvement of thermal storage/release and moisture transport properties of PEG-treated acrylic athletic socks and suggest the optimum add-on for PEG treatment, 2) to investigate wear performance of untreated cocks and two kinds of socks treated with PEG of minimum and optimum add-on respectively, and 3) to consider the effect of thermal storage/release and moisture transport properties of PEG- treated socks on the wear performance and the subjective comfort zone. Thermal activities of specimens treated by PDC were evaluated on a DSC by measuring the heat of fusion on heating and the heat of crystallization on cooling. Moisture regain, absorption speed, wickability, water retenti on value, and water-vapor permeability were measured. In the wear trials that the subjects performed a subsequent exercise protocol wearing three differently treated socks in a conditioned environment ($14\pm2^{\circ}C$, 65$\pm$2% R.H.), microclimate temperature and humidity, and subjective wear sensations including thermal sensation, wettedness, softness, fit, and overall comfort were obtained. PEC-treated specimens with more than 20% add-on showed thermal storage on heating and thermal release on cooling by a DSC and the heat contents of treated ones were generally proportional to the add-ons. Moisture transport properties were highly improved after PEG treatment and increased rapidly with increasing add-on. The tendencies were, however, relaxed above 50% add-on and the treated knits were much stiffer above that add-on. In the wear trials of untreated, PEG add-on 20%, and 50% acrylic socks, the changes of microclimate temperature of 50% socks were significantly less than that of 20% socks. PEG add-on 50% socks showed significantly less changes of microclimate humidity than other two kinds of socks. Three kinds of socks showed significant differences in overall comfort and add-on 50% socks were accepted more comfortable than other two kinds of socks. Comfort zone of foot was extended after PEG treatment on socks and it implied that the subjects wearing PEG- treated socks felt comfortable in wider ranges of microclimate temperature and humidity.

• 한국식품영양과학회지
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• 제2권1호
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• pp.41-47
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• 1973

In the present work, the quality stability of sun-dried Alaska pollack, Theragra chalcogramma, was discussed in the aspects of non-enzymatic discoloration as a function of relative humidity during storage at room temperature$(20^{\circ}C)$. Frozen Alaska pollack was dressed, filleted, dried for 48 hours in the open air, and finally stored in cylindrical acrylic chambers which contained saturated specific salt solutions proposed by Rockland(1960) for humidity control. The color development of the product was analyzed by spectrophotometry at 10 day-intervals during the storage. Lipid oxidation was measured as TBA value at wavelength of 538nm. And browning pigments were extracted, divided into two fractions and measured at 460nm: one was chloroform-methanol (2:1 v/v)soluble fraction attributed to lipid oxidation, and the other was water dialyzed fraction caused by so called Maillard reaction. The TBA value showed a maximum on 30 day storage, hereafter, intended to decrease gradually. On the other hand, the rate of brown pigment development in water dialyzed fractions as well as in chloroform-methanol soluble fractions was lower at 34 to 45%RH than at any other case, and propagation of lipid oxidation was also diminished at the same levels of humidity. From the facts described previously, it is recognized that storage at 34 to 45%RH provides higher quality stability for sun-dried Alaska pollack.

• 한국식품저장유통학회지
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• 제10권1호
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• pp.28-31
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• 2003

농산물의 고품질 유지 저온저장 및 저장물 관리의 편리화를 위해서 원거리에서 저장고 환경을 감시할 수 있는 인터넷을 이용한 저온저장고 환경감시 및 경보 시스템을 개발하였으며, 그 내용을 요약하면 다음과 같다. 실용화를 촉진하기 위하여 환경감시 및 경보 시스템의 저온저장고측 컴퓨터를 산업용 제어반인 PLC(Programmable Logic Controller)로 하여 원거리 환경감시 및 경보시스템을 제작하였다. 농가에서 사용하기 쉽게 윈도우용 환경하에서 작동하는 원거리 환경감시 프로그램을 개발하였으며, 전화선을 통해 수시로 저장환경을 감시할 수 있고, 기기 이상시 전화 및 호출기로 경보하게 하였다. 농업기계화연구소 저장유통기계연구실 홈페이지에 저온저장고 실시간 감시 사이트를 시험용으로 제작하여 인터넷이 가능한 컴퓨터에서 어디서나 저장상황을 감시할 수 있게 하였다. 시스템의 성능시험 결과 저장고내의 온도편차는 기존의 $\pm$1∼2$^{\circ}C$에 비해 $\pm$0.5$^{\circ}C$로 나타났으며, 습도편차는 $\pm$2% 이내로 나타나 정밀한 결과를 보였다. 본 시스템의 작업정밀성, 취급성, 보급필요성 등에 대한 설문조사 결과, 작업정밀성, 취급성 및 보급필요성에 있어서 긍정적인 반응이 많았으며, 농가에서 실용적으로 사용 가능할 것으로 판단된다.

• 한국식품저장유통학회지
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• 제5권1호
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• pp.7-12
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• 1998

Chestnuts(Castanea cretana, Eunki) were used for quality evaluations from the physiological and physicochemical points of view during storage under different temperatures and relative humidities for 8 months. Quality criteria included spouting, rotting, weight loss, and the changes in moisture, total sugar, reducing sugar, and total vitamin C of the stored sample. Sprouts(roots) were developed in about 2 months in all stored samples which had been mixed with sawdust(50% moisture) and stored under the conditions of 2∼25$^{\circ}C$ and 62∼95% RH. The sprout development was more significant in the storage temperature of Pit(9${\pm}$6$^{\circ}C$, 80${\pm}$5% RH, PT)and room(16${\pm}$7$^{\circ}C$, 85${\pm}$10% RH, RT) than low(3${\pm}$1%, 80${\pm}$5% RH, LT)and ambient(14${\pm}$11$^{\circ}C$, 67${\pm}$5% RH, AT). The rates of rotting and weight loss were appreciable in the order of PT, AT, RT and LT, and those of LT were 1∼2%. The use of wet sawdusts resulted in the increase of moisture contents in stored samples, thereby causing the rotting phenomena. Some chemical components of stored samples were found liable to the changes according to storage conditions, that is; total sugars showed a decreasing tendency along with a temporary increase during storage, and both reducing sugar and vitamin C were similarly accumulated in the samples stored at low temperature conditions. The results indicated that long-term storage of chestnuts will be possible in either cases of the application of low temperature following sprout-inhibition treatment or the use of lower temperature than 0$^{\circ}C$ to suppress its sprouting during storage.

• 한국추진공학회지
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• 제9권2호
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• pp.46-53
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• 2005

혼합형 고체 추진제의 온도 및 습도 가속노화 시험을 수행하여, 그 결과를 분석하였다 수명 평가를 위해서 온도 가속 노화 시험을 수행하였고, 산화제인 AP의 흡습성에 의해 추진제가 연화되는 특성을 분석하기 위해 상대습도 10, 30, $50\%$에서 습도 노화 시험을 수행하였다 온도 가속 노화 시험은 시편을 제작하여 시험하였고, 습도 시험은 실제 모터와 유사한 추진제 블록을 만들어 시험하였다. 온도 가속 노화 결과 $60^{\circ}C$에서 4개월 저장 결과가 $20^{\circ}C$에서 10년 저장한 결과로 예측되었다 HTPB 바인더를 사용한 혼합형 고체 추진제는 시간에 따라 경화되는 경향을 나타내었으며, 상대 습도 $50\%$까지는 습기의 영향이 크게 나타나지 않았다.

• 한국식품과학회지
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• 제37권6호
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• pp.1028-1034
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• 2005

시판 비타민 정제 중의 수용성 비타민의 저장 습도 및 온도에 따른 저장안정성을 연구한 결과 개봉을 하지 않은 상태에서는 저장온도에 상관없이 상당히 안정한 것으로 나타났다. 그러나 시판 비타민 정제 중의 vitamin $B_2$ 와 $B_3$를 제외한 대부분의 수용성 비타민 개봉을 한 상태에서는 습도에 매우 민감하여 그 손실 속도가 매우 빨라지는 경향을 나타내었다. 따라서 이러한 결과로 볼 때 tablet형태의 복합 비타민제의 경우 저장 온도보다는 저장 습도에 유의를 하여야 할 것으로 판단되며, 이에 따른 포장 재질 및 방법 등에 대한 사전 검토가 충실히 이루어져야 할 것으로 생각된다. 또한 소비자들에게도 개봉 후 수분에 일정시간 노출이 된 경우에는 유효성분의 변화 또는 분해가 일어날 수 있으므로 개봉 후에도 서늘하고 건조한 곳에서 저장을 해야 된다는 사실을 주지시킬 필요가 있다. 그러나 본 연구에서 사용한 개봉 후 제품은 뚜껑과 실리카 겔이 완전히 제거한 상태에서 수행한 실험이므로 실제적으로 가정에서 뚜껑과 실리카 겔이 존재한 상태에서의 저장 결과와는 같지 않을 것으로 생각되며, 이에 대한 추가적인 연구가 필요할 것으로 판단된다.