• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.102.1-102.1
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• 2010

고효율 멀티정션박막태양전지의 바텀셀 적용을 목적으로, 반응성CVD(Reactive thermal CVD)기술을 이용, $Si_2H_6+GeF_4$를 원료가스로, 이들이 가진 산화환원반응을 이용하여 400도 이하의 저온에서 Ge 및 Si 기판에 Ge을 에피성장 시켰다. Ge 기판위의 호모에피막의 경우, $2.5{\AA}/sec$의 성장속도와 99%의 Ge조성을 보였고, RHEED 및 HR-XRD를 통한 결정성 평가 결과, 고품질의 Ge 에피막의 성장이 확인되었다. 동일한 성장조건을 Si기판에 헤테로에피성장 시켰을 경우, 4% 격자불일치에 의해 막품질이 저하되는 것을 확인하였다. 이를 개선하기 위하여 저온에서 제작한 버퍼층에 대한 논의를 하고자 한다.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.269-269
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• 2011

핵융합로에서 챔버 벽면의 보호와 입자 문제를 해결하기 위해 최근 챔버 벽면의 보론 박막 코팅에 대한 연구가 활발히 연구 중이다. 핵융합로 운전 시 챔버 벽면 부근의 플라즈마는 저온 플라즈마와 상태가 비슷해 저온 플라즈마에서의 표면분석 기술을 적용할 수 있다. 이를 이용해 보론이 증착된 벽면의 상태를 실시간으로 관찰할 수 있다. 본 연구에서는 이에 앞서 저온 플라즈마에서 보론이 증착된 시편을 가지고 두께를 측정해 보았다. 증착 시편의 훼손된 부분은 보정법을 이용하여 보정하였다. 측정 결과 보정 전에는 시편마다 많은 차이를 보였지만 보정 후에는 거의 일정한 결과를 얻었으며 광학적 방법에 의해 측정한 두께와도 비슷한 결과를 얻었다. 저온 플라즈마 실험 결과 보론 박막 측정에 대한 신뢰성을 확인하였으며 이를 바탕으로 KSTAR의 벽면 진단에 적용함으로써 핵융합 플라즈마의 불안정성을 간접적으로 측정할 수 있는 가능성을 확인하였다.

• Food Science and Preservation
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• v.10 no.1
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• pp.1-5
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• 2003

This study was carried out to extend a marketing shelf-life of the Jeju greenhouse mandarin fruits. Total soluble solids were not showed any significant differences by the temperatures and pre-treatments during the marketing period. Acid content and firmness of the fruits were gradually decreased, which were better in cold than in room temperature treatment. The fruits washed in electrolyzed acid water(pH 2.4∼2.7) maintained freshness higher than those of control Internal CO$_2$concentration of those was 1.0 ％ more or less in the beginning marketing stage, but increased along the marketing period in mom temperature. Especially Internal CO$_2$concentration of wax-coated fruits rapidly increased more than any other, whereas it was a little decreased in cold treatment. After 10 days in room temperature, decay ratio of the fruits was below 4.0% in electrolyzed acid water washing, compared to 10.4% in control. After 30 days in cold temperature, decay ratio was only 3.7% in electrolyzed acid water washing compared to 4.4% of wax-coated treatment and 7.4% of control. The weight loss among the pre-treatments in room temperature had no significant differences and was higher than in cold one.

• Horticultural Science & Technology
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• v.29 no.2
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• pp.151-155
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• 2011

The fungus Botrytis cinerea causes fruit rot of strawberry and the damages can result in harvest losses upto 50%. Proper timing of fungicide application is essential for successful control of Botrytis fruit rot, fenhexamid plus iminoctadine tris, cyprodinil plus fludioxonil, fludioxonil alone, and Bacillus subtilis QST713 were applied to individual buds, flowers, and green and red fruit of cultivar 'Seolhyang' ex vivo. Cyprodinil plus fludioxonil or fludioxonil alone was applied i) before and after a 5-hr period of low-temperature ($0^{\circ}C$) incubation ex vivo ii) in field trials. Strawberry flowers and red fruit were more susceptible to B. cinerea than the green fruits. Incidence of Botrytis rot with fenhexamid plus iminoctadine tris and cyprodinil plus fludioxonil was the lowest at flowering, whereas B. subtilis QST713 did not significantly among treatments. In 2010, incidence of Botrytis fruit rot was significantly reduced when fludioxonil was applied two times at 1 week intervals from 50% bloom in field trials. Cultivars Redpearl and Seolhyang were more susceptible to low-temperature than cvs. Maehyang and Akihime. Cyprodinil plus fludioxonil application was effective when applied before onset of the low-temperature treatment period. Fludioxonil showed the most effective when it was sprayed one and more than two times in before and post low-temperature condition, respectively. These results demonstrate that fungicide selection and timing can interact with stage of fruit development and low-temperature in determining effectiveness of suppression of Botrytis fruit rot.

• Transactions of the Korean Society of Mechanical Engineers
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• v.15 no.5
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• pp.1737-1746
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• 1991

본 연구에서는 저온의 순수물 속의 등온 수직원기둥에 의해 야기되는 열전달 특성을 구명함에 있어서 짧은 원기둥 범주에 속하는 종횡비 0.5인 얼음 원기둥을 이용 하여 실험적으로 열전달 특성을 구명하였다. 그리고 전 유동장을 가시화 하였으며, 얼음의 융해율로써 누셀트(Nusselt)수를 측정하여 기존의 결과들과 비교검토하였다.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2003.05a
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• pp.649-653
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• 2003

일반적으로 연료전지에는 알카리형(AFC)과 인산형(PAFC), 고분자형 연료전지(PEMFC) 등과 같이 비교적 저온에서 동작되는 연료전지와 고온형으로 $650^{\circ}C$에서 정온 동작되는 용융탄산염형 연료전지(MCFC)와 운전온도가 약 500~100$0^{\circ}C$로 폭넓게 적용될 수 있는 고체산화물 연료전지(혹은 고체전해질 연료전지, Solid Oxide Fuel Cell, SOFC)가 있다.(중략)

• Korean Journal of Microbiology
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• v.39 no.1
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• pp.45-50
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• 2003

The diversity and change of microbial communities during kimchi fermentation at $4^{\circ}C$ were analyzed by denaturing gradient gel electrophoresis (DGGE). Kimchi samples were taken every 5 days over the fermentation periods (for 60 days) to extract total DNA for DGGE analysis. Touchdown polymerase chain reaction was performed to amplify the V3 region of 16S rRNA gene. Sequencing results of partial 16S rDNA amplicons from DGGE profiles revealed that lactic acid bacteria (LAB), especially Weissella koreensis, Lactobacillus sakei and Leuconostoc gelidum were dominants in kimchi fermentation at $4^{\circ}C$. And we knew that W. koreensis steadily existed throughout the whole fermentation period, also Lb. sakei and Leuc. gelidum appeared from 10th day and 30th day of fermentation time, respectively and then these species were to be dominant microorganisms.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2004.11a
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• pp.30.2-30.2
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• 2004

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2001.11a
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• pp.135-140
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• 2001

• Journal of Sericultural and Entomological Science
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• v.18 no.2
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• pp.1-60
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• 1976

In present study, radioautography and electron-microscopy were applied by the author to the elucidation of the mechanism of diapause in Bombyx mori L. (1). Patterns of nucleic acid and protein syntheses during embryonic development of silkworms, incubated at high and at low temperatures, were demonstrated by means of radioautography with labelled precursors of nucleic acid and protein. On the third day after blastokinesis the embryo incubated at high temperature generally incorporated much of the $^3$H-glycine into the brain and the suboesophageal ganglion, and some into other regions. When incubated at low temperature, no difference in the pattern between the brain, the suboesophageal ganglion and other parts was observed. Radioautography with $^3$H-thymidine revealed no significant difference in DNA synthesis in embryos incubated at high and low temperatures. In diapausing eggs twenty days after deposition, only a few cells of the mesoderm incorporated the labelled material into their nuclei, but in the hibernated eggs all the nuclei of the mesoderm had thymidine incorporation. After blastokinesis only the anterior portion of the embryo around the brain and the suboesophageal ganglion had thymidine incorporation; this was not observed in the posterior portion.