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Al<sup>3+</sup>와 Y<sup>3+</sup> 동시치환 SnO<sub>2</sub> 투명전극 박막의 전기적 특성
김근우,서용준,성창훈,박근영,조호제,허시내,구본흔,Kim, Geun-Woo,Seo, Yong-Jun,Sung, Chang-Hoon,Park, Keun-Young,Cho, Ho-Je,Heo, Si-Nae,Koo, Bon-Heun 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.10
Transparent conducting oxides (TCOs) have wide range of application areas in transparent electrode for display devices, Transparent coating for solar energy heat mirrors, and electromagnetic wave shield. $SnO_2$ is intrinsically an n-type semiconductor due to oxygen deficiencies and has a high energy-band gap more than 3.5 eV. It is known as a transparent conducting oxide because of its low resistivity of $10^{-3}{\Omega}{\cdot}cm$ and high transmittance over 90% in visible region. In this study, co-doping effects of Al and Y on the properties of $SnO_2$ were investigated. The addition of Y in $SnO_2$ was tried to create oxygen vacancies that increase the diffusivity of oxygen ions for the densification of $SnO_2$. The addition of Al was expected to increase the electron concentration. Once, we observed solubility limit of $SnO_2$ single-doped with Al and Y. $\{(x/2)Al_2O_3+(x/2)Y_2O_3\}-SnO_2$ was used for the source of Al and Y to prevent the evaporation of $Al_2O_3$ and for the charge compensation. And we observed the valence changes of aluminium oxide because generally reported of valence changes of aluminium oxide in Tin - Aluminium binary system. The electrical properties, solubility limit, densification and microstructure of $SnO_2$ co-doped with Al and Y will be discussed.
함광준(Kwang-Joon Ham),박근영(Keun-Young Park),김민수(Min-Su Kim),송재모(Jae-Mo Song),이상수(Sang Soo Lee),옥용식(Yong Sik Ok) 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.6
The biogenic emission of the atmospheric volatile organic compounds (VOCs) from the forests is dominated by monoterpenes. This study investigated the changes in the concentration of monoterpenes distributed in various types of forest near the Gangwon Nature Environment Research Park, Hongcheon, Gangwon Province, Korea. Samples were collected from the three sites of different types of forest, including coniferous, broadleaved and mixed forests. Additionally, the seasonal and daily changes of monoterpene compounds were monitored. Our results found the several types of monoterpene such as α-pinene, β-pinene, camphene, d-limonene, p-cymene and α-terpinene. The highest total concentration of terpene compounds was observed in the coniferous forest. For the summer season, the total concentration of terpene compounds was highest in coniferous and mixed forests, and that was also highest in broad-leaved forest for the autumn.
ICT 중소기업 기술지원 투입과 성과간의 영향요인 분석
이형주(Hyung-ju Lee),이용훈(Yong-hun Lee),박소라(So-ra Park),이일진(Il-jin Lee),김서균(Seo-kyun Kim),박근영(Keun-young Park) 한국콘텐츠학회 2018 한국콘텐츠학회논문지 Vol.18 No.2
본 연구에서는 한국전자통신연구원(ETRI)에서 운영 중인 ICT 중소기업 기술지원을 수혜한 기업에 대한 기술지원 투입과 성과간의 영향요인을 분석하였다. 데이터 분석을 위하여 2015년~2017년 사이에 기술지원을 수혜한 181개 기업을 대상으로 설문조사를 실시하였고, 경로분석을 통하여 투입요인과 성과요인사이의 영향관계를 분석하였다. 연구결과, 기술수준 향상에 직접적인 영향을 미치는 요인은 지원서비스 품질인 것으로 나타났고, 비용절감 효과는 지원건수, 지원연차, 지원서비스 품질 모든 변수로 부터 정의 영향을 받는 것으로 나타나 중소기업 기술지원 프로그램은 중소기업의 비용절감에 많은 기여를 하는 것으로 분석되었다. 또한 기여매출액에 영향을 미치는 투입요인은 지원건수이며, 지원연차와 지원 서비스품질은 유효하지 않은 것으로 나타났다. 마지막으로, 기술·경제적성과가 고용창출에 미치는 영향을 살펴본 결과, 기여매출액이 많이 발생할수록 고용창출효과도 상승하는 것으로 나타났다. This study aim to analyze the factors affecting technical support input and performance of companies benefiting from ICT SME technology support operated by ETRI. In order to analyze the data, we surveyed 181 companies who received technical support between 2015 and 2017, and analyzed the relationship between input factors and performance factors through path analysis. As a result of the study, it was found that the service quality was directly influenced on the improvement of technology level, and the cost reduction effect was influenced by the amount of support, the year of support, and the service quality. Also, input factors affecting contribution sales are the amount of support, and the support year and quality of support services are not effective. Finally, as a result of examining the effect of technological and economic performance on job creation, it is found that the effect of job creation increases as the contribution sales increase.
강태훈(Tae-Hoon Kang),채수림(Soo-Lim Chae),최우영(Woo-Young Choi) , 박찬(Chan Park),남재환(Jae-Hwan Nam),주영란(Young-Ran Joo),박근영(Keun-Yong Park),조해월(Hae-Wol Cho),김인범(In-Beom Kim) 대한해부학회 2005 Anatomy & Cell Biology Vol.38 No.3
일본뇌염바이러스 (JEV)는 사람에 있어서는 급성뇌염을 유발하고, 다양한 배양세포에 있어서는 해로운 영향을 줄 것이라고 알려져 있다. 본 연구는 일본뇌염바이러스 (JEV)에 감염된 생쥐의 뇌에서 세포자멸사가 발생하는지를 알아보고자 하였다. JEV에 감염된 생쥐 뇌의 특정부위에서의 DNA파쇄는 DNA oligonucleosomal laddering을 관찰함으로써 확인하였고, 진행중인 세포자멸사는 in situ terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) 기법으로 관찰하였다. TUNEL 염색과 JEV 항원에 대한 염색법을 이용하여 이중면역염색법을 시행한 결과, 감염된 많은 신경세포들이 TUNEL 면역염색성을 나타내었다. 이와 같은 결과는 생쥐 뇌에서 JEV 감염에 의해 유도된 세포사멸은 세포자멸사성 기작과 연관이 있으며, 따라서 이러한 세포자멸사는 일본뇌염에 따른 병 발생에 중요한 역할을 하는 것으로 보인다. Japanese encephalitis virus (JEV) may cause acute encephalitis in humans and induce severe cytopathic effects in various types of cultured cells. To investigate whether JEV infection induces apoptosis, we examined DNA fragmentation and apoptosis in the specific region of the JEV infected mouse brain by DNA oligonucleosomal laddering and in situ terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) technique and immunohistochemical study. JEV infections in the mouse brain were detected in the telencephalon, the diencephalons, and the brain stem, but not in the cerebellum and the hippocampus. Fragmentation of cellular DNA into oligonucleosome-length ladders was only observed in tissue samples prepared from the cerebral cortex. In addition, the large number of TUNEL-positive cells was observed in the cerebral cortex. Double-labeling experiment with TUNEL staining and immunostaining for the JEV showed that TUNEL-positive neurons containing JEV immunoreactivity. These results suggest that JEV infection may evoke apoptotic neuronal death in the mouse brain, which plays an important role in the pathogenesis of Japanese encephalitis.
불화규산의 mutans streptococci에 대한 항균작용 및 인체돌연변이 유발가능성에 관한 연구
박은아,박근영,박병래,김유영,윤현경,최기운,이진용 대한구강보건학회 2001 大韓口腔保健學會誌 Vol.25 No.4
Antibacterial effect of F^- at lower concentrations present in fluoridated water and local application of F^- on cariogenic bacteria is controversial. The present study was performed to examine antibacterial effect of fluorosilicic acid at various concentrations and long-term effect of the fluoride at lower concentrations on representative strains of mutans streptococci: S. mutans NCTC 10449 and S. sobrinus 6715. For the purpose, physico-chemical characteristics of the bacteria treated with fluorosilicic acid were observed. Minimum inhibitory concentration (MIC) of F^- for S. mutans and S. sobrinus was determined to be 50 and 100 ppm, respectively, as measured by optical density. The addition of F^- at MIC to mutans streptococci in the exponential phase decreased the cell viability by more than 80%. F^- in combination with xylitol and polyphosphate slightly enhanced their antibacterial activity. The experimental strains exposed to F^- (0∼15 ppm) for 2 years on blood agar plates containing fourosilicic acid demonstrated to obtain resistance to some extent to F^-. F^- exposure decreased the inhibition of the bacterial growth by F^- as observed after the incubation with F^- at the range of MIC, the concentration determined 2 years ago. The decrease in the inhibition of growth and survival by F^- was more prominent with the strains long-term exposed to higher concentrations of F^-. The pH of the F^- -exposed strains when cultured in broth containing fluorosilicic acid was significantly lower than that of the strains which had not been exposed to F^-. Difference in pH between 4- and 24-h incubation was more prominent with the strains long-term exposed to F^-, suggest that F^- exposure conferred F^- resistance to the mutans streptococci. The higher concentrations of F^- the strains exposed to, the higher synthesis of soluble glucan was measured in S. mutans, resulting in higher binding of the bacterium to glass surface. However, those were decreased in S. sobrinus long-term exposed to higher concentrations of F^-. Regardless whether the bacteria were exposed to F^- or not, no significant difference in binding to saliva-coated hydroxyapatite and protein profiles. Transmission electron micrographs revealed that loss of the cell wall and vacuolization in the cytoplasm were distinct in the bacteria exposed to higher concentrations of F^-. It was shown in Ames test that F^- up to 100 ppm appeared to be negative for mutagenicity. Overall, the results suggest that combination of fluorosilicic acid with other anticariogenic reagents may be benefical for a better caries prevention. Use of fluoride for long-term period of time even at lower concentrations may contribute to the efficacy of fluoride in caries prevention, inhibiting the bacterial function and metabolism.