• Journal of the korean academy of Pediatric Dentistry
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• v.31 no.2
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• pp.236-246
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• 2004

Artificial carious lesions in various depths were observed with visual examination using light transillumination, bite-wing radiography, laser fluorescence, and dye-enhanced laser fluorescence to determine the reproducibility, correlation of each diagnostic method, diagnostic sensitivity and diagnostic specificity. And optical densities according to demineralized times were measured whether laser fluorescence could be used as a quantitative diagnostic method. The following results were obtained whether laser fluorescence could be used for diagnosis of initial proximal caries. 1. Tau-c values of visual examination was 0.08 which showed lowest reproducibility and those of bite-wing radiography, laser fluorescence, dye-enhanced laser fluorescence were 0.60, 0.48, and 0.64, respectively which showed relatively high reproducibility. 2. The correlation between demineralization time and each examination was the highest in dye-enhanced laser fluorescence$({\gamma}=0.51)$ followed by laser fluorescence$({\gamma}=0.43)$, bite-wing radiograph$({\gamma}=0.35)$, and visual examination$({\gamma}=0.33)$. Dye-enhanced laser fluorescence and laser fluorescence showed significant correlation with demineralization time. 3. The sensitivity of laser fluorescence and dye-enhanced laser fluorescence for diagnosing approximal caries based on bite-wing radiography were 67%, 100% and those of specificity were 57%, 11% which showed diagnostic specificity was relatively lower than sensitivity. 4. The difference in optical density(DFR) between sound teeth and carious lesions according to lesion depth was high with dye-enhanced laser fluorescence compared with laser fluorescence. DFR measured with laser fluorescence according to changes in lesion depth was statistically significant but was not statistically significant with dye-enhanced laser fluorescence. Based on these results, laser fluorescence and dye-enhanced laser fluorescence have comparable diagnostic power as bite-wing radiography in early diagnosis of proximal caries.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2004.11a
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• pp.155-157
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• 2004

• 한국생활과학회:학술대회논문집
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• 2009.05a
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• pp.129-130
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• 2009

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2009.11a
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• pp.53-54
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• 2009

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2011.03a
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• pp.66-66
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• 2011

우리나라 근해의 풍부한 해양자원인 해조류를 염재로 한 천연염료의 제조는 자원의 부가가치를 높일 뿐만 아니라 새로운 색소성분의 발굴과 함께 천연염색의 색상 다양화 효과를 얻을 수 있다. 본 연구는 국내 자생 해조류로부터 다양한 색상을 얻기 위해 여러 가지 추출공정을 사용하여 색소를 추출하고 염색성을 조사하여 새로운 염재로서의 유효성을 확인하는데 목적이 있다. 이를 위하여 사용한 해조류는 제주에서 자생하는 구멍갈파래, 청각이다. 해조류 색소를 추출하여 분말화 형태로 만들어 염색하였고 추출공정에 따른 다양한 색상 구현을 할 수 있게 되었다. 해조류 색소의 특성을 알아보기 위해 UV-Vis, FT-IR 분석에 의해 그 성분을 확인하였다. 염색은 면섬유, 견섬유, 모섬유, 나일론섬유를 사용하여 염색하였다. 추출공정의 다양화를 통해 해조류 색소를 직물에 염색했을 때 직물의 색상과 염착량에 미치는 영향을 평가하였고, 세탁, 마찰 그리고 일광에 대한 견뢰도를 측정하였다. 색소의 기능성을 평가하기 위해 해조류 색소분말의 황색포도상구균(Staphylococcus aureus)에 대한 항균성을 평가하였다. 본 연구에서 추출공정을 달리하여 제조한 해조류 색소는 다양한 색상구현에 적합하였고, 견직물과 모직물에 염착이 잘 되었다. 또한 해조류 색소는 항균성을 지녀 향후 기능성 천연염료로서 응용가능성이 매우 클 것으로 전망된다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.2 no.4
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• pp.200-207
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• 1990

This study is concerned with the meandering of plume axis in oceanic waters. The process is understood that it is a consequence of the differential contribution by the multiple harmonics of local velocity field to variances of center of mass of crossplume as a function of distance from the source point. A diagnostic model is proposed which is aimed to delineate the eddying motions and furthermore the amplified meandering of plumeaxis. From the data base of dye plumes, wave lengths of meandering eddies are estimated to range between 5.5 to 60.3 (m) in coastal surface waters. A numerical simulation is conducted to predict the concentration field of meandering plume.

• Applied Chemistry for Engineering
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• v.18 no.6
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• pp.650-653
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• 2007

$SnO_2$-doped $TiO_2$ powder was obtained from tin (IV) bis(acetylacetonate) dichloride and titanium diisopropoxide bis(acetylacetonate) with quinacridone as the dye sensitizer molecule. The structural changes of the reaction mixture were monitored by fourier transform infrared (FT-IR) spectroscopy. The morphology and microstructure of gel powder were studied by field-emission scanning electron microscopy (FE-SEM) and X-ray diffractometry (XRD). The photocatalytic activity of these powders with the anatase structure was investigated by using indigo carmine solution as a test dye

• Journal of Life Science
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• v.14 no.4
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• pp.577-581
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• 2004

Comamonas sp. AEBL-85 was isolated from microbial granules in an activated sludge process of long-term operated for the treatment of reactive azo dye, and characterized its capability to decolorize Reactive Black 5. The effects of adding carbon source and nitrogen source on the extent of decol-orization were analyzed to develop an optimal medium. The optimum initial pH and temperature wire 6.0 and 35$^{\circ}C$, respectively. Reactive Black 5 of 50 mg/l was readily decolorized up to 95% within 40 hr by Comamonas sp. AEBL-85.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.2
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• pp.168-174
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• 2009

In this paper Gel polymer electrolyte using Poly(Vdf-HFP) was fabricated and compared with liquid type electrolyte. The chemical structure and ingredients of fabricated gel electrolyte was investigated and identified to gel polymer electrolyte by FTIR, gel electrolyte was verified to polymer state by SEM From the experiment result, the better component ratio of Propylene carbonate and Diethyl carbonate for gel type electrolyte was 5 : 5. The conversion efficiency of fabricated DSCs using gel electrolyte was $3{\sim}4[%]$, expected to alternate with liquid type electrolyte.

• Proceedings of the Materials Research Society of Korea Conference
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• 2009.05a
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• pp.6.1-6.1
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• 2009

최근 신 재생 에너지에 대한 관심이 고조되고 있으며 특히 태양전지는 차세대 대체에너지로 많은 연구 개발이 이루어지고 있다. 현재 태양전지 시장은 벌크실리콘 태양전지가 주를 이루고 있으나, 박막형, 유기물, 염료감응형 등 다양한 차세대 태양전지가 개발되고 있다. 차세대 태양전지는 글래스나 폴리머 기판위에 형성된 전극을 바탕으로 하여 다양한 형태의 태양전지가 형성되기 때문에 태양전지용 투명도전성 산화물 전극에 대한 중요성이 증가하고 있다. 예를 들어 실리콘 박막형 태양전지의 경우 수소 플라즈마 분위기 안정성 때문에 ZnO:Al 전극이 개발, 적용되고 있다. 이밖에도 ZnO는 나노입자, 나노로드 등의 다양한 형태를 기반으로 유기물 및 염료감응형 태양전지 전극으로 적용되고 있다. 본 연구에서는 전기화학적 방법을 이용해 나노입자, 나노로드, 나노 sheet 등 다양한 형태의 ZnO 나노구조를 형성한 후, 태양전지 적용을 위한 전기적, 광학적 특성을 분석하였다. 3차원 형태의 ZnO sheet 전극은 90% @ 550 nm 가 넘는 우수한 광특성 (Haze value)을 보였으며, 염료감응형 태양전지에 적용되었을 경우 2차원 형태의 ZnO 전극에 비해 Jsc 값이 2.5배 이상 향상되었다.