• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2002년도 추계종합학술대회
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• pp.656-661
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• 2002

라이다 광원용 다중통과 Ti-sapphire 증폭기를 각도다중 방식으로 설계하여 출력에너지 및 스펙트럼 특성을 개선하였다. 2-단의 다중통과 증폭기에서 파장이 790nm 일 때, 42mJ의 출력에너지와 21dB의 증폭이득 및 26%의 출력효율을 얻었으며, 715~930nm이 파장가변 영역에서 스펙트럼 선폭은 0.05$cm^{-1}$ / 이하였다. 780nm의 파장에서 35%의 SHG 변환효율과 390nm의 파장에서 13%의 THG 변환효율을 각각 얻었다. 결과적으로 240~306nm의 자외영역과 360~460nm의 deep-blue 영역에서 연속적으로 파장을 가변시킬 수 있었다.

• 한국입자에어로졸학회지
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• 제6권1호
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• pp.29-35
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• 2010

Transition metals such as V, Fe, and Ni were used to synthesize doped zinc oxide nanoparticles from mixed liquid precursors by using the flame spray pyrolysis (FSP). The effects of dopants on the powder properties such as morphology, specific surface area, crystal structure, and light adsorption were analyzed by TEM, BET, XRD, and UV-Vis diffuse reflection spectrum (DRS), respectively. The results showed that hexagonal wurtzite structured ZnO:M (M = V, Fe, Ni) nanoparticles were successfully synthesized by the FSP. The transition metal-doping resulted in the decrease in its particle size and crystallite size. The UV-vis absorption spectra of ZnO:M nanoparticles were also red-shifted. ZnO:V showed the highest MB degradation of 99.4% under the UV irradiation after 3 hrs.

• 한국의류학회지
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• 제43권2호
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• pp.288-296
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• 2019

This study examined the proper dyeing conditions, color fastness and functionality for wool fabrics dyed with Chamaecyparis obtusa leaf extract. FT-IR and UV-Vis spectrum analysis showed that tannin and flavonoids were contained in the extracted colorant. The dyeing of wool fabrics using Chamaecyparis obtusa leaf was good without pretreatment or mordant treatment. Optimal dyeing conditions for wool fabrics were a colorant concentration of 70%(v/v), dyeing temperature of $100^{\circ}C$, dyeing time of 100 minutes and dyebath pH of 5.8. Color fastness of dyed wool fabrics to washing, rubbing, perspiration was good, whereas light was grade 3. The UV protection rate and deodorization rate of wool fabrics dyed with Chamaecyparis obtusa leaf improved. Reduction rate of Staphylococcus aureus/Klebsiella pneumoniae were excellent at 99.9%. Therefore, it was confirmed that Chamaecyparis obtusa leaf can be used as environ-mentally friendly natural dye.

• 생명과학회지
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• 제19권11호
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• pp.1672-1678
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• 2009

B. amyloliquefaciens IUB158-03균주에서 정제된 항진균물질은 극성인 용매에 잘 용해되고, pH 6.0~10.0와 $-70{\sim}121^{\circ}C$에서와 같이 넓은 범위의 온도 및 pH에서 안정성을 보였다. 항진균물질의 FAB-MS, UV 흡수 스펙트럼, 아미노산 조성 등을 분석한 결과 분자량은 1,042 이었고, TLC를 이용하여 분석한 결과 ninhydrin solution에서 보라색으로 발색되었다. UV 스펙트럼은 220 nm, 277 nm에서 ${\lambda}max$를 보였으며, $Asn_3$, $Gln_2$, $Ser_1$ $Gly_1$, $Tyr_1$의 아미노산 조성을 갖는 것으로 나타났다. 그리고 $^1H$-NMR spectrum, $^1H$-COSY, HMQC 을 분석한 결과 iturin A계에 속하는 물질로 확인되었다. NIH3T3 섬유아세포에 대해 항진균물질이 세포독성을 나타내지 않는 것은 물론 마우스에 항진균물질을 경구투여하여 장기 내의 변화와 백혈구 수, 생체내의 생리적인 기능면에서 정상 마우스와 차이를 보이지 않았으므로 생체독성이 없는 것으로 나타났다. 따라서 본 연구를 통하여 B. amyloliquefaciens IUB158-03에서 분리된 항진균물질이 앞으로 고추탄저병의 생물적 방제제로 이용될 수 있는 잠재성을 갖고 있는 것으로 사료된다.

• Safety and Health at Work
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• 제8권3호
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• pp.237-245
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• 2017

Background: Solar furnaces are used worldwide to conduct experiments to demonstrate the feasibility of solar-chemical processes with the aid of concentrated sunlight, or to qualify high temperature-resistant components. In recent years, high-flux solar simulators (HFSSs) based on short-arc xenon lamps are more frequently used. The emitted spectrum is very similar to natural sunlight but with dangerous portions of ultraviolet light as well. Due to special benefits of solar simulators the increase of construction activity for HFSS can be observed worldwide. Hence, it is quite important to protect employees against serious injuries caused by ultraviolet radiation (UVR) in a range of 100 nm to 400 nm. Methods: The UV measurements were made at the German Aerospace Center (DLR), Cologne and Paul-Scherrer-Institute (PSI), Switzerland, during normal operations of the HFSS, with a high-precision UV-A/B radiometer using different experiment setups at different power levels. Thus, the measurement results represent UV emissions which are typical when operating a HFSS. Therefore, the biological effects on people exposed to UVR was investigated systematically to identify the existing hazard potential. Results: It should be noted that the permissible workplace exposure limits for UV emissions significantly exceeded after a few seconds. One critical value was strongly exceeded by a factor of 770. Conclusion: The prevention of emissions must first and foremost be carried out by structural measures. Furthermore, unambiguous protocols have to be defined and compliance must be monitored. For short-term activities in the hazard area, measures for the protection of eyes and skin must be taken.

• 한국재료학회지
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• 제11권7호
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• pp.550-555
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• 2001

rf PECVB법을 이용하여 붕규산 유리 기판 위에 diamond like carbon(DLC) 박막을 증착하였다. 메탄(CH$_4$)-수소(H$_2$) 혼합 가스를 전구체 가스로 사용하였다. DLC 박막의 형상, 구조 및 광학적 특성은 SEM, 라만 및 UV 스펙트럼으로 분석하였다. 증착 속도는 혼합 가스의 수소 농도에 따라 증가하다가, 혼합 가스 유량이 25 sccm 이상에서는 일정하게 되었다. UV스펙트럼으로 계산한 박막의 optical band gap은 증착 시간과 DC serf bias의 증가에 따라 감소하는 경향을 나타냈으나, 수소함량에 의해서는 거의 영향이 없었다. 박막의 투과율에 가장 큰 영향을 미치는 인자는, 특히 자외선 영역과 가시광선 영역에서, bias 전압이었다.

• 한국결정성장학회지
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• 제16권1호
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• pp.25-31
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• 2006

남미, 아프리카, 아시아 대륙의 자수정을 대상으로 하였다 ICP-AES 분석에서 나타난 발색원소는 Fe, Cr, Cu, Co이며 대체적으로 남미 지역에서 발색원소의 함유량이 높게 나타났다. UV-VIS 분석결과 천연자수정과 합성자수정은 350nm 영역과 550nm 영역에서 흡수가 일어나는 특성을 나타냈고 투과율은 합성에 비해 천연이 낮게 나타났다. FT-IR분석결과 천연자수정과 합성자수정의 구분은 합성자수정의 특징인 $3543cm^{-1}$ 흡수밴드의 유무에 의해 알 수 있었다 남미 지역은 $3584cm^{-1},\;3435cm^{-1}$ 흡수밴드가 강하게 나타나며, 아프리카 지역은 $3299cm^{-1},\;3196cm^{-1}$ 흡수밴드가 나타났다. 아시아 지역은 $3381cm^{-1}$ 흡수밴드가 특징적으로 관찰되었다.

• Journal of Microbiology and Biotechnology
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• 제6권4호
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• pp.265-269
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• 1996

An isolate of Streptomyces rochei synonym was found to produce antibiotics with narrow anti-microbial spectrum against Streptococcus and Xanthomonas sp. Among the antibiotic complex produced by the strain, the main active compound was isolated, and its physico-chemical properties and biological activities were investigated. Molecular weight of the compound was determined to be ${[M+H]}^+$ 797 (FAB-MS). UV, $^1H \;and\;^{13}C$ NMR, and IR spectra suggested that the compound is a kirromycin-like aurodox group antibiotic. However, the anti-microbial spectrum of the main compound was slightly different from that of kirromycin. In addition, it was newly found that kirromycin showed a selective anti-microbial activity against Streptococcus pyogenes and phytopathogenic Xanthomonas sp.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2000년도 춘계학술발표대회
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• pp.509-511
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• 2000

An antifungal antibiotic was produced from Bacillus sp. YJ-63, and antibiotic was purified to a homogeneity by butanol extraction, Silica-gel column chromatography, Sephadex LH-20 gel filtration column chromatography and HPLC. The purified antibiotic showed one spot on Thin Layer Chromatography, which was negative to ninhydrin and positive to iodine. This finding indicated that the antibiotic was a cyclopeptide structure. UV absorption spectrum of the antibiotic in methanol was maximal at 277 nm, which corresponded to the spectrum for all of the Iturin antibiotic. The antibiotic was stable up to $121^{cdot}C$ and in the range of pH $3.O{\sim}l2.0$ with a stable of ${\alpha}-amino$ acid and ${beta}-amino$ acid, and showed high activity for fungi and yeasts,

• 한국미생물·생명공학회지
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• 제23권1호
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• pp.98-103
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• 1995

During the screening of antifungal antibiotics from microbial metabolites, we selected Pseudomonas aeruginosa KGM-100 showing powerful antagonistic activity against various phytopathogenic fungi. Antibiotics KGM-100A and KGM-100B were purified from the culture broth of Pseudomonas aeruginosa KGM-100 by diaion HP-20 column chromatography, ethyl acetate extraction, silica gel column chromatography, preparative TLC and recrystallization. KGM-100A which was recrystallized in MeOH showed antimicrobial activities against a broad spectrum of fungi and bacteria. Physico-chemical properties of KGM-100A were determined and identified to be phenazine-l-carboxylic acid by UV, IR, $^{1}$H-NMR, $^{13}$C-NMR, mass spectrum, and elemental analyses.