• Journal of Bio-Environment Control
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• v.24 no.3
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• pp.243-251
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• 2015

This study aimed to determine the effects of root zone cooling using air duct on air temperature distribution and root zone and leaf temperatures of sweet pepper (Capsicum annum L. 'Veyron') grown on coir substrate hydroponic system in a greenhouse. When the air duct was laid at the passage adjacent the slab, the direction of air blowing was upstream at $45^{\circ}$. The cooling temperature was set at $20^{\circ}C$ for day and $18^{\circ}C$ for night. For cooing timing treatments, the cooling air was applied at all day (All-day), only night time (5 p.m. to 1 a.m.; Night), or no cooling (Control). The air temperature inside the greenhouse at a height of 40 and 80cm above the floor, and substrate and leaf temperatures, fruit characteristics, and fruit ratio were measured. Under the All-day treatment, the air temperature was decreased about $4.4{\sim}5.1^{\circ}C$ at the height of 40cm and $2.1{\sim}3.1^{\circ}C$ at the height of 80cm. Under the Night treatment, the air temperature was decreased about $3.4{\sim}3.8^{\circ}C$ at the height of 40cm and $2.2{\sim}2.7^{\circ}C$ at the height of 80cm. The daily average temperature in the substrate was in the order of the Control ($27.7^{\circ}C$) > Night ($24.1^{\circ}C$) > All-day ($22.8^{\circ}C$) treatment. Cooling the passage with either upstream blowing at $45^{\circ}$ or horizontal blowing at $180^{\circ}$ was effective in lowering the air temperature at a height of 50cm; however, no difference at a height of 100cm. Cooling the passage with perpendicular direction at $90^{\circ}$ was effective in lowering the air temperature at the height between 100 and 200cm above the floor; however, no effect on the temperature at the height of 50cm. A greater decrease in leaf temperature was found at 7 p.m. than that at 9. a.m. under both All-day and Night treatments. Fresh weight partitioning of fruit was in the order of the All-day (48.6%) > Night (45.6%) > Control (24.4%) treatment. A higher fruit production was observed under the All-day treatment, in which the accumulated average temperature was the lowest, and it may have been led to a higher proportion of photosynthate distributed to fruit than other treatments.

• Journal of Bio-Environment Control
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• v.4 no.2
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• pp.240-245
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• 1995

In order to find out the effect of temperature and shading on the growth and major disease infection of Eutrema wasabi Matsum., experiments were at growth chamber condition and field. Plant height, petiole and rhizome of wasabi were obvious decreased with increase the temperature, from which the optimum air temperature for the plant growth were estimated to be 17$^{\circ}C$. The light intensity of the treatment with 75% shading net was favorable to the length of main rhizome, rhizome weight and whole plant weight. Infection ratio of black leg and soft rot were increased at high temperature condition, however their infection ratio were decreased with increase the shading condition.

• Journal of Bio-Environment Control
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• v.30 no.3
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• pp.230-236
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• 2021

Changes in greenhouse temperature and solar radiation due to fogging and shading were monitored during hydroponics in high temperature in summer season. Experiment 1 consists of four treatments, namely, Control, Shading, Fogging, and Fogging + Shading based on sunny days August. For Experiment 2, two melon cultivars of 'Dalgona' and 'Sopoong gaza' were cultivated in summer of 2020 using Fogging + Shading with the best result for temperature reduction effect from Experiment 1. As a result of Experiment 1, the effect of Fogging + Shading on temperature reduction was apparent where the inside was about 4℃ (as the lowest temperature) lower than the outside. Fogging + Shading showed the inside was 2-4℃ lower than the outside, and Fogging or Shading treatments had little difference, compared to the Control where the internal temperature of greenhouse was 3-4℃ higher than the external. For solar radiation changes between greenhouse inside and outside, the internal change was in a similar pattern between Fogging and Control, and between Shading and Fogging + Shading, respectively. In case of the Fogging treatment (similar with the Control) only the effect of solar radiation reduction as influenced by plastic greenhouse covering materials was examined. The Fogging + Shading had a very similar change in solar radiation to the Shading. Based on these results, Experiment 2 was conducted in summer of 2020 and resulted in a temperature reduction effect of about 3.9℃ according as the inside of air-conditioned greenhouse was kept 32.4℃ when the maximum temperature of the outside reached 36.3℃ in August during the cultivation period. In addition, the quality of melon fruit was good (1.3-1.5 kg of fruit weight, 12.6-13.3 of soluble solids content. In the case of using Fogging + Shading cooling treatment, it can bring about the effect of reducing the temperature during the high temperature in summer, and normal growth of melon and fruit harvesting were possible.

• Food Science and Preservation
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• v.14 no.6
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• pp.565-570
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• 2007

Changes in the quality of Hallabong tangor during growth stage and with temperature pre-treatment after harvest were investigated. Soluble solids of Hallabong increased continuously until early December. The acid content of M16A, a variant species of Hallabong, decreased by 1% after October and continued to decrease until the middle of January. After ripening, treatment to reduce the acid content was required. Fruit firmness decreased gradually until November and was maintained at 1000 g-force after this time. Soluble solids and acid content were $13.3{\pm}0.83^{\circ}Brix$ and $1.07{\pm}0.52%$. Soluble solids increased in temperature-treated Hallabong with prolonged storage, but acid content did not decrease. Fruit firmness also decreased with storage period, regardless of temperature pre-treatment. Therefore, water management during cultivation, temperature treatment above $35^{\circ}C$ after harvest, and checking of the acid content and soluble solids with prolonged storage are recommended in achieving high quality Hallabong.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2003.10a
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• pp.224.2-225
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• 2003

흑미죽의 저장성을 조사하기 위하여 알루미늄 접착 플라스틱 백에 배합된 흑미죽의 원료들을 밀봉하여 121$^{\circ}C$에서 20, 30, 40분간 호화와 동시에 가열 살균시킨 뒤 냉각시켜 온도 4$0^{\circ}C$, 습도 58%의 저장고에 3개월 동안 저장하면서 15일 간격으로 관능검사와 물리적 변화를 조사하였다. 맛, 경도, 점성, 색깔, 향, 전반적 기호도 등 관능적 품질은 각각의 저장 15일 후가 가장 좋았으며 그 후로는 점차적으로 약간 떨어지는 경향을 나타내었다. 온도에 따른 차이는 20분간 가열 살균한 것이 제조 직후에는 다른 처리구 보다 약간 떨어졌으나 저장 15일 후부터는 처리구간에 큰 차이를 보이지 않았다. 점도는 세 처리구 모두 제조 직후에 가장 낮았는데 그 후로 저장 60일 까지 서서히 증가하다가 다시 점점 떨어지는 경향을 나타냈다. 가열살균 온도에 따른 처리구에 있어서 점도의 차이는 크지 않았다. 색도는 저장기간 동안에 L값은 점점 낮아지는 반면에 a값과 b값은 점차적으로 증가하는 경향을 나타내었으나 가열 온도에 따른 처리구간에 색도의 차이는 그다지 크지 않았다.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2022.09a
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• pp.45-45
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• 2022

일당귀[Angelica acutiloba (Siebold & Zucc.) Kitagawa]는 산형과(Apiaceae), 당귀속(Angelica)에 속하는 다년생 식물로 일본이 원산지다. 국내에서는 참당귀(A. gigas)와 더불어 뿌리를 약용의 목적으로 재배하며, 잎과 줄기는 쌈채소로 이용하는 작물 중 하나이다. 본 연구의 목적은 일당귀에 대한 GA₃ 처리 및 온도에 따른 발아특성을 분석하여 약용 및 식용으로 활용도가 높은 일당귀의 재배 및 생산에 대한 기초자료로 사용함에 있다. 연구에 사용된 일당귀의 종자는 강원도 태백시에 위치하는 일당귀 재배농가에서 2021년 10월에 채종한 종자를 구입하여 실험에 사용하였고, 종자의 수분흡수율과 다온도 종자발아기를 활용하여 GA₃농도 4조건(50 ppm, 100 ppm, 500 ppm, 1,000 ppm), 온도 6조건(5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃)에 따른 발아특성을 조사하였다. 연구결과 일당귀 종자 100립의 초기 무게 0.264 g에서 증류수 침지 2시간이 경과 후 약 60 %의 무게가 증가한 0.424 g으로 증가하였고, 이후 5 %내외의 수분흡수율을 보이며 48시간 경과 후 약 120% 증가한 0.587 g을 나타냈으며, 이후 72시간 경과 후 0.582 g으로 측정되어 일당귀 종자의 수분포화도는 약 120%정도 내외로 사료된다. GA₃농도 및 온도에 따른 발아율은 500 ppm의 GA₃농도에서 가장 높은 75.63 %의 발아율을 나타냈으며, 15 ℃와 20 ℃의 온도에서 가장 높은 77.6 %의 발아율을 나타냈다. 하지만 각각의 GA₃농도 및 온도에 따른 발아율은 500 ppm의 GA₃농도, 10 ℃의 온도 처리구에서 가장 높은 89.9 %의 발아율을 나타냈으며, 5 ℃의 온도 처리구에서는 모든 GA₃처리구에서 발아가 진행되지 않았다.

• Journal of Sericultural and Entomological Science
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• v.35 no.1
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• pp.52-59
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• 1993

Raw silk degumming, by which the sericin and other marterials are eliminated from fibroin, is very essential process to produce silk fabrics. Alkali chemicals and enzymes have been used for the silk-degumming process. In this paper, the effect of heat treatment was investigated on silk fibers degummed by two different methods, soap and enzymatic degumming method. The difference between these two degumming methods was analyzed on the basis of results of mechanical testing, thermal analysis and intrated spectroscopy. The tenacity and the elongation of silk fiber are decreased by the heat-treatment in wet state. This tendency is observed in both cases of two degumming methods. The peak temperature in DSC analysis, which is attributed to thermal decomposition of silk fiber, was shifted to higher value with the heat-treatment temperature for the soap degummed silk fiber, however, it was not for the enzymatic degummed one. The IR crystallinity of soap digummed silk fiber is increased with the heat-treatment temperature, while that of enzymatic degummed fiber is not.

• Korean Journal of Food Science and Technology
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• v.32 no.1
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• pp.111-116
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• 2000

Effects of ultra-high pressure treatment on viable cell count and quality characteristics of low salt fermented anchovy under different operating conditions such as pressure$(200{\sim}500\;MPa)$, temperature$(20{\sim}50^{\circ}C)$ and treatment time$(5{\sim}20\;min)$ were investigated. Viable cell count decreased gradually with the increase of pressure and suddenly at 400 MPa. It also decreased by seven folds at $50^{\circ}C$ and logarithmically with the increase of treatment time. Peroxide value increased with the increase of pressure, temperature and treatment time, and temperature played a major role. Thiobarbituric acid value was higher by two folds in samples treated than in the untreated regardless of any conditions investigated. Volatile basic nitrogen was almost the same in all samples except the one at $50^{\circ}C$. The sample treated at greater than $30^{\circ}C$ under high hydrostatic pressure indicated higher value in amino nitrogen. Treatment at $20^{\circ}C/300$ MPa/15 min showed greater reductions in viable cell counts, remaining better quality of low salt fermented anchovy.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.56 no.3
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• pp.205-211
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• 2011

This study was carried out to find optimum roasting condition of sesame seeds for making seed season and oil treated with different temperatures and time intervals. Sesame seeds with 17~18% of moisture content were treated under fixed and changed roasting temperature conditions. The fixed temperatures are ranged from 160 to $240^{\circ}C$ with $20^{\circ}C$ intervals. The changed temperatures were treated at low(160 and $180^{\circ}C$) and medium(200 and $220^{\circ}C$) for 10 minutes, and at high(220 and $240^{\circ}C$) for 3 minutes. Meanwhile, roasting times were 20-30 minutes longer under low temperature condition and 3-5 minutes shorter under high temperature condition. The optimum roasting temperature and time were determined as $220^{\circ}C$ and 3 minutes for producing seed season, and as $220^{\circ}C$ and 5 minutes for sesame oil, respectively, in roasting with small quantity of sesame seeds. On the other hand, in the large scale roasting condition, those showed $240^{\circ}C$ and 15 minutes in for producing seed season, and $280^{\circ}C$ and 10 minutes and $260^{\circ}C$ and 15 minute for producing seed season in white-colored sesame variety and black-colored sesame variety, respectively.

• KSBB Journal
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• v.19 no.3
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• pp.231-235
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• 2004

This paper was investigated to clarify the possibility of ammonia gas removal by essential oil. First of all, the chemical analysis was peformed to analyze the composition of an essential oil by GC-MS. The monoterpenes in an essential oil react with ammonia by neutralization and their reaction mechanism was elucidated. Based on their chemical neutralized reaction, the removal efficiencies of ammonia gas were studied to derive the optimal conditions in the scrubber tower such as optimal temperature and pH. The experimental result shows that the removal efficiency of ammonia gas was achieved over 98 % by the misty aerosol dispersion of scrubber tower.