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  Title, Summary, Keyword: UV irradiation
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  The degradation of EVA for the protection of solar cell by UV-rays irradiation (자외선 조사에 따른 태양전지 보호용 EVA의 열화)
  김규조;연복희;김승환;김완태;허창수
  We studied the degradation of EVA for the protection of solar cell by UV-rays irradiation. We investigated the reduction of electrical efficiency, photo transmmitance and degradation of EVA by UV-rays irradiation. We utilized the UV irradiation equiped with fluorescent 313nm UV lamp and radiated for 400 hours. For the chemial analysis, we used the UV-vis spectrometer, XPS and examined the degradation mechanism by UV irradiation. It is found that the discolored phenomena, the decrease of photo transmmitance and oxidation reaction is occured by UV irradiation on the EVA sample for the protection of solar cell.
  Effect of UV Irradiation on the Color and Mechanical Properties of Catechu Dyed Fabrics (자외선 조사가 아선약 염색 직물의 색상 및 역학적 특성에 미치는 영향)
  Nam, Ki-Yeon;Lee, Jung-Soon
  pp.1009-1023
  https://doi.org/10.5934/KJHE.2011.20.5.1009 인용 PDF KSCI
  So, Byung-Soo;Hwang, Jin-Ha
  Effect of UV-C and Electron Beam Irradiation of on the Quality of Rice Wine (Makgeolli) (UV-C 및 전자선 조사가 막걸리의 품질에 미치는 영향)
  Kim, Hyun-Joo;Lee, Kyung Haeng;Yong, Hae In;Jo, Cheorun
  This study was conducted to evaluate the changes in the quality of rice wine (Makgeolli) treated with UV-C and electron beam (EB) irradiation during its storage at $4^{\circ}C$ for 15 days. The EB irradiation was found to be more effective than the UV-C irradiation for microbiological control. The pH tended to be increased by UV-C, EB irradiation, and storage period. Acidity was significantly higher in rice wine treated with EB irradiation than those of control and UV-C irradiation during storage period. The $L^*$-value of the samples treated with UV-C and EB irradiation tended to be proportionately higher than that of the control, but this was not consistent during storage period. The $a^*$-value of the sample treated with EB was higher than that of the others, but this was not consistent during the storage period. The reducing sugar content was higher in the control at day 0, but it rapidly decreased compared with the control during the storage. The results indicate that EB irradiation was more effective than UV-C irradiation in controlling microorganisms of rice wine. However, a further study is needed to minimize the rice wine quality deterioration caused by UV-C or EB irradiation during storage.
  https://doi.org/10.11002/kjfp.2013.20.1.45 인용 PDF KSCI
  Decomposition of Organophosphorous Compounds with Ultraviolet Energy(UV-C) (자외선에너지(UV-C)를 이용한 유기인계 화합물의 분해)
  Kim, Jong-Hyang;Min, Byoung-Chul
  Two organophosphorous insecticides, Dichlorovos and Chloropyrifos were degraded in the presence of UV irradiation, UV irradiation with $TiO_2$ powder and UV irradiation with sea sand using low pressure mercury lamp. The identification of these compounds was carried out by gas chromatograph with a nitrogen-phosphorous detector, Total Organic Carbon and Ion Chromatograph, respectively. Both dichlorvos and chloropyrifos, UV irradiation with sea sand were more degradable than UV irradiation and UV irradiation with $TiO_2$ powder. The final products were $Cl^-$ in Dichlorvos, $Cl^-$ $SO_4{^{2-}}$ in Chloropyrifos, respectively.
  Relationship between the pretilt angle generation and the polarization component with oblique polarized UV light irradiation on polyimide surface. (폴링미드표면에 편광된 UV광을 경사조사시의 프리틸트각의 발생과 편광성분의 상호관계)
  서대식;박두석
  UV Effect on Plant Growth
  Kondo, Noriaki;Tou, Seiji;Takahashi, Shinya;Nakajima, Nobuyoshi
  UV-B radiation gives harmful effects on plants, such as production of several types of DNA lesions, and growth inhibition. On the other hand, plants have some protective mechanisms, including filtering effect due to accumulation of phenolic compounds in epidermal cells and reactivation of DNA lesions, which are enhanced by UV-B irradiation. We have investigated the mechanism of UV-B effects on plants using cucumber seedlings as plant materials. Cucumber plants were cultivated in an artificially lit growth chamber. Supplemental UV-B irradiation, of which intensity was almost equal to the level of natural sunlight, retarded the growth of first leaves. The growth retardation must result trom the inhibition of cell division and/or cell growth. Microscopical observation of leaf epidermis suggested that the growth retardation might be mainly caused by cell growth inhibition. The retardation was, however, restored within 2 or 3 days after the termination of UV-B irradiation. It is known that UV-B irradiation lowers the activity of photo system II (PS II). In the present experimental conditions, however, UV-B irradiation has little effect on PS II activity as estimated by chlorophyll fluorescence. The stomatal conductance, a major factor determining photosynthetic rate, of first leaves increased during the growth. The increase of stomatal conductance was suppressed by UV-B irradiation and restored by termination of the irradiation. It has not been clear, however, what mechanisms are involved in the suppression of increase of stomatal conductance.
  Investigation of Potential Photoreactivation of Pseudomonas aeruginosa after LP or MP UV Irradiation (저압 및 중압 자외선 조사에 의해 불활성화된 Pseudomonas aeruginosa의 광회복능 조사)