• 복식문화연구
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• 제11권6호
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• pp.967-971
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• 2003

As the concerns over health increased in 1990's, research and development on the health material were also activated. The development of UV-cut textile became the hot issue, because the damage of W irradiation due to ozone depletion has become widely known. UV-cut effect is determined by the material, the color, the organization and the density of UV-cut fibers. UV-cut effect is very different according to the fibers. Polyester is known to have a better effect. Even in the same textile material, staple fiber has more effect than filament fiber. Different colors have different offsets. Although textiles have the same color, the effects can be different according to the depth of color. PET, PET/cotton blend, nylon and cotton fabrics were ultraviolet cutting finished with padding method using several absorbers. These UV-cut effect can be improved through the processing. Safety of UV-cut textile for the body must be considered future, Until now the figure of the UV-cut effects has been emphasized. There has been no experiment on the human body, although the textiles are directly on the human body. Futhermore there os no safety standard of UV-cut textiles. Therefore every effort will be made to set the standard UV-cut processing is established. The need of UV-cut products will be known to the consumers.

• 상하수도학회지
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• 제35권6호
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• pp.489-496
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• 2021

Water disinfection using UV-LED(Light emitting diode) has many advantages, such as smaller footprint and power consumption as well as relatively longer lifespan than those of conventional mercury-UV lamps. Moreover, UV-LED disinfection is considered an environmentally benign process due to its mercury-free nature. In this study, disinfection using an LED module emitting 275nm UV was carried out. 384 UV-LEDs were put into a cylinder tube with a capacity of 1.7 liters. The UV intensity of the UV-LED module was controlled from 1.7 to 8.4 mW/cm². The disinfection efficiency for the model microorganism solutions(E. coli ) was monitored. As the UV intensity(I) and contact time(t) varied, inactivation of the microorganisms from 2 to 4-log-removals(i.e., 99 to 99.99% of disinfection efficiency) was achieved. Disinfection using UV-LED was followed to 1^st order reaction and the reaction rate constant, k was determined. In addition, the relationship between UV intensity(I) and contact time(t) in order to obtain 99.99% of disinfection efficiency was modeled: I^1.2·t= 460, which indicates that the product of UV intensity and contact time requiring 4-log-removals is always constant.

• 한국환경과학회:학술대회논문집
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• 한국환경과학회 2008년도 추계학술발표회 발표논문집
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• pp.350-354
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• 2008

전기/UV 공정에 사용하기 위해 일반적인 살균 램프인 UV-C 램프와 오존도 같이 발생하는 오존 등의 RhB 분해능을 고찰한 결과 오존 램프의 RhB 제거율이 UV-C램프보다 높은 것으로 나타났다. 전해질을 첨가하지 않은 전기/UV 공정에서 최적 전류는 1 A로 나타났다. 전기/UV 공정에서 RhB 제거의 경우 전기분해 공정과 UV 공정의 단일 공정의 RhB 농도감소와 전기/UV 복합 공정의 RhB 제거는 같아 공정의 시너지 효과는 관찰되지 않았다. 그러나 COD의 경우 전기분해 공정과 오존 램프에 의한 단일 공정의 COD 제거보다는 전기/UV 공정의 COD 제거농도가 높아 시너지 효과가 나타나는 것으로 사료되었다.

• Journal of Microbiology and Biotechnology
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• 제30권12호
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• pp.1937-1943
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• 2020

Although classical metabolic engineering strategies have succeeded in developing microbial strains capable of producing desired bioproducts, metabolic imbalance resulting from extensive genetic manipulation often leads to decreased productivity. Thus, abiotic strategies for improving microbial production performance can be an alternative to overcome drawbacks arising from intensive metabolic engineering. Herein, we report a promising abiotic method for enhancing lycopene production by UV-C irradiation using a radiation-resistant ΔcrtLm/crtB+dxs+ Deinococcus radiodurans R1 strain. First, the onset of UV irradiation was determined through analysis of the expression of 11 genes mainly involved in the carotenoid biosynthetic pathway in the ΔcrtLm/crtB+dxs+ D. radiodurans R1 strain. Second, the effects of different UV wavelengths (UV-A, UV-B, and UV-C) on lycopene production were investigated. UV-C irradiation induced the highest production, resulting in a 69.9% increase in lycopene content [64.2 ± 3.2 mg/g dry cell weight (DCW)]. Extended UV-C irradiation further enhanced lycopene content up to 73.9 ± 2.3 mg/g DCW, a 95.5% increase compared to production without UV-C irradiation (37.8 ± 0.7 mg/g DCW).

• 반도체디스플레이기술학회지
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• 제6권2호
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• pp.41-44
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• 2007

Optical simulation of the rear and front panel geometries were needed to improve the luminance and efficiency in PDP cells. The 3-dimensional optical code can be used to analyze the variation of geometries and changing of optical properties. In order to improve the accuracy of simulated results, a new UV source, called a multi-cubes UV source, was designed. To design the source, at first UV distribution was calculated with the plasma fluid code and then the UV distribution was transformed to the multi-cube structures in the optical code. Compared to the results from existing UV source, called a planar UV source, could be improved the accuracy of visible light distribution. Simulated results were also compared to the visible distribution measured with the ICCD in a real PDP cell.

• 대한환경공학회지
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• 제30권5호
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• pp.517-523
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• 2008

본 연구에서는 펜톤반응, 광반응, 그리고 Fe$^{2+}$와 UV의 조합반응을 이용하여 항균제이면서 신종오염물질 중의 하나인 Triclosan (TCS)에 대한 분해 메커니즘을 해석하였다. 결과에 의하면 Fe$^{2+}$의 산화율은 $H_2O_2$와 UV-C에서 각각 30%와 28%로 차이를 보이지 않은 반면 UV-A의 경우 15%로 차이를 보였다. TCS의 초기 분해속도는 광반응(UV-C > UV-A)이 Fe$^{2+}$와 UV 조합반응과 펜톤 반응보다 높았으나 반응시간의 경과와 함께 Fe$^{2+}$가 포함된 조합반응에서의 분해속도 증가가 관찰되었다. 또한 반응중 메탄올의 첨가에 의해 모든 반응에서 영향을 받았고 펜톤반응의 경우 20분 동안 분해효율 90%에서 5%로 급감되었다. 이온성 부산물인 Cl$^-$의 생성율은 Fe$^{2+}$와 UV-C 조합반응에서 가장 높았으며(77% / 150 min) 메탄올이 첨가된 반응 초기에서는(15 min) 12%의 Cl$^-$ 생성을 보인반면 다른 반응들은 무시할 수준($\leq$2%)이었다. TOC의 제거 역시 Fe$^{2+}$와 UV-C의 조합반응에서 가장 높았으며 펜톤반응, Fe$^{2+}$와 UV-A 조합반응, UV-C 광반응, 그리고 UV-A의 광반응 순으로 낮았다. 그러나 펜톤반응의 경우 90분 후 부터는 반응이 거의 중지되는 것이 관찰되었는데 이는 $H_2O_2$에 의한 Fe$^{2+}$의 산화반응이 중지되었기 때문이다. 이에 반해 Fe$^{2+}$와 UV의 조합공정에서 반응은 지속되었다. 또한 초기 Cl$^-$ 생성은 Fe$^{2+}$와 UV-C의 조합반응에서 환원반응에 의한 TCS의 분해메커니즘을 가지고 있다고 할 수 있다. 환원에 의한 분해는 할로겐화유기화합물의 무기화에 매우 유리하므로 TCS의 대안적 처리방법으로 UV-C와 Fe$^{2+}$의 조합반응은 적용가능하다.

• 생명과학회지
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• 제16권4호
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• pp.704-709
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• 2006

본 연구는 DNA 상해유도기작을 규명하기 위하여 꼬마선충 (Caenorhabditis elegans) 으로 부터 subtraction hybridization 방법을 이용하여 자외선 유도 유전자인 UV100과 UV150을 분리하고 그 유전자 구조와 발현양상을 조사하였다. 분리한 유전자의 발현양상을 Northern hybridization 방법으로 살펴본 결과 자외선 조사 후에 최대 2배 이상의 발현 증가를 나타내었다. 이 결과 이미 밝혀진 다른 UV-inducible 유전자와 유사하게 UV100과 UV150 유전자는 자외선에 의해서만 발현이 증가됨을 알 수 있었다. 또한 분리한 유전자의 기능을 알기 위하여 RNAi 실험을 한 결과 분리한 자외선 유도유전자는 발생단계에 따라 다양한 DNA 회복기작을 나타냄을 알 수 있었다.

• 공업화학
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• 제10권1호
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• pp.30-34
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• 1999

클로로타노닐과 엔도슬판을 UV 조사, pH 3.0에서의 UV조사, 그리고 3.5% 염수에서 UV조사를 하여 광분해 거동을 연구하였다. 농약의 광분해과정은 가스크로마토그래프, 총유기탄소, 그리고 이온크로마토그래프를 사용하였다. Low pressure mercury multilamp($8W{\times}6$)를 반응기에 잠수시켜 실험을 하였으며, 초기농도는 10 ppm으로 하였다. 클로로타노닐은 UV 조사, pH 3.0조건에서 UV조사, 그리고 3.5% 염수조건에서 UV조사 조건에서 반응시간 30분에 거의 광분해되었다. 자외선조사에서 엔도슬판-${\alpha}$는 38%, 엔도슬판-${\beta}$는 25% 분해되었다. 엔도슬판-${\alpha}$(83%)는 자외선조사에서 65%, pH 3.0의 자외선조사에서 70%, 35% 염수의 자외선조사에서는 75% 분해되었다. 엔도슬판(16%)는 자외선조사에서 80%, pH 3.0의 자외선조사에서는 98%, 3.5% 염수의 자외선조사에서는 90% 분해되었다.

• Korea Journal of Cosmetic Science
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• 제2권1호
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• pp.1-10
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• 2020

Protection mechanisms for skin damage of ultraviolet (UV) absorbers in personal care products for protection against UV are well studied, but not for hair protection. The purpose of this study is to describe and compare the changes of physical property produced in human hair by doses of the UV-B exposure causing protein degradation. To observe the change of physical properties in hair, the experimental intensity of UV-B exposure has been established on the basis of statistical data from official meterological administration as daily one hour sunlight exposure for two weeks. Polysilicone-15, ethylhexyl methoxycinnamate (OMC), and octocrylene were employed for UV-B absorber, and those were treated to hair swatch by rubbing wash through shampoo and conditioner. Bending rigidity displayed kinetically successive reduction at high doses of UV exposure up to the 8,000 s, and exhibited different level at each sample of UV-B absorber. However, the values of Bossa Nova Technologies (BNT) for shinning factor were already saturable at the 2,000 s exposure except that treated with polysilicone-15. The differential scanning calorimetry (DSC) to measure a strength of inner protein produces a successive reduction of enthalpy as like a reduction of bending rigidity upon UV exposure. Surface roughness from lateral force microscope (LFM) acquired immediately after UV exposure show a saturable frictional voltage which has been also found in a saturable BNT data as the time of UV exposure increases. Through researching the DSC and the LFM, shinning of hair was much correlated to the protein damage at the surface, and bending rigidity could be regulated by the protein structural damage inside hair. Therefore, the optimization of efficient strategy for simultaneous prevention of hair protein on the surface and internal hair was required to maintain physical properties against UV.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.2
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• pp.1043-1046
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• 2003

We investigated the EO performances of the UV aligned twisted nematic liquid crystal display (TN-LCD) with the UV exposure on a-C:H thin film surface. LC alignment using UV exposure on the a-C:H thin film surface was achieved. Monodomain alignment of the UV aligned TN-LCD can be observed. An good EO characteristics of the UV aligned TN-LCD was observed with oblique ion beam exposure on the a-C:H thin film surface. Therefore, the EO property of the UV-aligned TN-LCD with UV exposure on the a-C:H thin film surface is almost the same as that of the rubbing-aligned TN-LCD on a polyimide (PI) surface.