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류시옥,이승철,송병수,황순묵 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1
Study on the ignition of methane fuel system highly diluted with argon was carried out in the temperature range of 1515∼1905K behind a reflected shock wave to investigate the rate coefficients for the reaction CH3+O2=CH3O+O. Ignition delay times were measured by monitoring the light absorption by methyl radical at ca. 214nm and pressure profiles. Computer modeling study of methane oxidation was also performed using a GRI_MECH, version 2.11 mechanism for sensitivity analysis and calculation of ignition delay times. The correlation of τp with the maximum heat release rate (dq/dt)max in the reaction zone was also investigated.
정장표, 이승훈, 윤항묵 경성대학교 환경문제연구소 2000 環境硏報 Vol.10 No.1
The object of this study was to identify source categories of Busan area through FA/MA methodology which contribute to the concentration of suspended particles at receptor. According to the purpose of this study, twenty-seven chemical species such as elements, anions, and total carbon of chirty-six PM10 and TSP data sets sampled at Bumchun receptor site for a 24hr period from May to Aug. 1992, were analyzed and applied to FA/MA model. From this study, the following conclusions were obtained. From the factor analysis for measured data, steel, mill-related, transportation, soil dust resuspension, marine, fuel oil, secondary aerosol source, and etc., of which total variance explained by the identified factors was calculated as 84 ∼ 91%, were identified. And the trend was shown that the more the number of input trace materials was, the more difficult the identifications of factors were, relatively. Selecting the representive tracers for identified factors based on the factor loadings, the following equations were obtained by use of stepwise method in multiple linear regression for the cases. TSP(㎍/㎥) = 27.996+0.033Mg +0.016Cl-+0.O05SO42 Case 1 TSP(㎍/㎥) = 11.779 + 2.013Ti + 0.034Na + 0.026Mg + 0.006ca Case 2 PM10(㎍/㎥) = 3.130+0.O04 SO42 +0.010 Cl- + 1.812Ti Case 1 PM10(㎍/㎥) = -14.028+1.515Ti +0.D38Na + 0.O09 Cl- + 0.003 SO42- Case 2 In comparison with the results of FA/MR model with the change of the newly added input tracers, the case with TSP showed relatively unstable results of factor analysis for the case studies because of insufficient number of data available to complete a factor analysis for the tracers used.
디지털 이미지 분석을 이용한 Fly Ash의 원형지수 측정
Lee, Seung-Heun,Kim, Hong-Joo,Bae, Soon-Muk,Lee, Won-Jun,Sakai, Etsuo,Daimon, Masaki 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.8
미분탄 화력발전소에서 보일러의 부하를 변화시켰을 때 전기집진기에서 단별 채취한 fly ash에 대해서 디지털 이미지 분석을 이용하여 원형지수를 검토하였다. 원형지수 측정은 다음과 같은 다섯 단계, 즉 ① 이미지 획득, ② 이미지 전처리, ③ 검출, ④ 이미지 후처리, ⑤ 측정의 단계를 거쳐 이루어 졌다. Fly ash의 평균 원형지수는 0.78∼0.83의 범위를 나타냈으며, 같은 위치에 있는 호파에서 채취한 fly ash는 보일러의 부하에 관계없이 유사한 원형지수 값을 나타냈다. 그리고 첫 번째 호파에서 세 번째 호파로 갈수록, 즉 fly ash의 평균 입경이 작아질수록 원형지수는 증가하는 경향을 나타냈다. This paper investigates circularity of fly ashes using the digital image processing. Fly ashes directly collect from electrostatic precipitator when the load of conditions of boiler are changed at a coal-fired power plant. Circularity measurement can be accomplished in five steps: ① image acquisition, ② grey image processing, ③ detection the component to measure ④ binary image processing ⑤ feature measurement. The mean circularity of fly ashes is in the range of 0.78 to 0.83. fly ashes collected from the same hopper has similar circularity regardless of the load of boiler and circularity increases as going from the 1st hopper to 3rd one, namely as particle size become finer.
Lee, Seung Muk,Seo, Tae Yang,Park, Geun Chul,Choi, Jun Hyuk,Jeong, Sang Hyeon,Jung, Seung-Boo,Choi, Dae Hyuk,Lim, Jun Hyung,Joo, Jinho American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.10
<P>Mesocrystal is a promising material for improving photocatalytic activity because of its large specific surface area and almost single crystalline structure. In this work, anatase TiO2 mesocrystals were synthesized via a simple hydrothermal process and the morphology and consequent photocatalytic property was controlled through hydrofluoride (HF) addition. The morphology of TiO2 was significantly varied with the amount of HF addition. The pure TiO2 was elliptical mesocrystal, having bipyramidal sub units with high portion of {101} facets, arraying in the [001] direction. Similar mesocrystal morphologies were obtained, but the sub unit size decreased as HF content increased to 0.01 wt%, and the shape of the sub unit then changed to nanosheet with the introduction of further HF (1-2 wt%). The 0.01 wt% sample exhibited superior photocatalytic activity over the pure sample, decomposing similar to 70% and similar to 80% methylene blue in 1 h for the pure sample and 0.01 wt% sample, respectively, resulting from enlarged specific surface area and fluorinated surface. The photocatalytic activity reduced to similar to 20% for the 1-2 wt% particles due to the decrease in surface area and formation of the TiOF2 phase. The present work suggests that the morphology and photocatalytic activity of TiO2 mesocrystal are facilely modified through HF introduction.</P>
Lee, Seung Muk,Park, Geun Chul,Seo, Tae Yang,Jung, Seung-Boo,Lee, Ju Ha,Kim, Young Dok,Choi, Dae Hyuk,Lim, Jun Hyung,Joo, Jinho IOP 2016 Nanotechnology Vol.27 No.39
<P>Reactive surface-exposed anatase TiO<SUB>2</SUB> (a-TiO<SUB>2</SUB>) is highly desirable for?applications requiring superior photocatalytic activity. In order to obtain a favorable surface, morphology control of the a-TiO<SUB>2</SUB> using capping agents has been widely investigated. Herein, we systematically study the effects of different F sources (HF, TiF<SUB>4</SUB>, and NH<SUB>4</SUB>F) as the capping agent on the morphology control and photocatalytic activities of a-TiO<SUB>2</SUB> in a hydrothermal process. When either HF or TiF<SUB>4</SUB> was added, large truncated bipyramids formed with the photocatalytically active {001} facet, whereas the NH<SUB>4</SUB>F was not effective for facet control, yielding nanospheres similar to the pure a-TiO<SUB>2</SUB>. The morphology changes were related to the decomposition behaviors of the F sources in the solvent material: HF and TiF<SUB>4</SUB> decomposed and supplied F<SUP>−</SUP> ions before a-TiO<SUB>2</SUB> nucleation, which changed the nucleation rate and growth direction, leading to the resultant a-TiO<SUB>2</SUB> morphology. On the other hand, NH<SUB>4</SUB>F supplied F<SUP>−</SUP> ions after a-TiO<SUB>2</SUB> nucleation and could not change the growth behavior. In terms of the photocatalytic effect, the HF- and TiF<SUB>4</SUB>-treated a-TiO<SUB>2</SUB> effectively decomposed ∼90% and ∼80% of methylene blue, respectively, in 1 h, while ∼60% was decomposed for the NH<SUB>4</SUB>F-treated a-TiO<SUB>2</SUB>. Note that pure a-TiO<SUB>2</SUB> photocatalytically decomposed only ∼10% of methylene blue over the same time. These results pave the way to precise control of the facet of TiO<SUB>2</SUB> through using different capping agents.</P>
Lee, Chang Min,Park, Geun Chul,Lee, Seung Muk,Choi, Jun Hyuk,Jeong, Sang Hyeon,Seo, Tae Yang,Jung, Seung-Boo,Lim, Jun Hyung,Joo, Jinho American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.11
<P>MoS2 nanosheets were fabricated with different precursor concentrations to investigate their effects on crystal structure, chemical state of elements, and morphology. MoS2 nanosheets were prepared by conventional hydrothermal routes at 200 degrees C for 24 h, while maintaining the Mo/S precursor mol ratio of 1:12. The XRD and XPS analyses showed that a hexagonal structure of 2H-MoS2 nanosheets was formed without a second phase for all samples and crystallinity was enhanced along the c-axis with increasing precursor concentration. The FESEM and TEM images revealed that MoS2 nanosheets were aggregated and formed nanoflowers, and that their irregular shape changed to nearly spherical as the concentration increased. The size of the nanoflowers was closely related to the dimension of the nanosheets and their sizes slightly increased with increasing concentration ranging from 0.14 M to 0.7 M, then rapidly increased at 1.4 M. We believe that these results are related to not only the enhanced growth rate but also the decreased additives-absorption on the S layers with precursor concentration.</P>
Jin, Seung-won,Lee, Tae-sung,Lee, Sang-sook,Lee, Chang-muk,Sohn, U-ik 大韓免疫學會 1996 大韓免疫學會誌 Vol.18 No.2
자궁 경부암 환자의 생검 조직으로부터 HPV DNA 존재와 c-myc 증폭을 조사하였다. Southern blot과 in situ hybridization 결과로부터 HPV DNA는 integrated form으로 존재하며, HPV-16/18형은 cervical intraepithelial neoplasia(CIN)에 비해 condyloma에서 더 많이 발견되었고, HPV-16/18, 31/33/35형은 condyloma와 CIN에서 똑같은 빈도로 발견되었다. 또한 자궁경부암 환자 7명 모두에서 c-myc이 증폭되었으며, 통제군에 비해 최고 26배까지 증폭되기도 하였다. 이러한 결과들로부터 자궁경부암 발병에 있어서 HPV와 c-myc이 중요할 역할을 할 것임을 알 수 있다.