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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>
김미영,이철호,김영묵,박영우,이동윤,이준상,김진관,이무열,권형주,황인석,유흥선 대한소화기내시경학회 2000 Clinical Endoscopy Vol.20 No.6
Behcet's disease is a multisystemic, chronie inflammatory disease with a triad of symptoms including oral ulcers, genital ulcers, and inflammatory ocular lesions. While intestinal Behcet's disease commonly affects the ileocecal region, esophageal ulceration with odynophagia is very uncommon. A 38-year-old male patient was admitted due to odynophagia, a postprandial epigastric burning sensation, and right lower quadrant abdominal pain. He had a history of recurrent oral and genital ulcerations, An esophagogastroduodenoscopy revealed relatively well demarcated ulcerative lesions with mucosal nodiularities on the mid to distal esophagus which was suspected to be esophageal cancer. But repeated biopsies showed lymphocytic and plasma cell infiltrations on the lamina propria. A colonoscopy revealed a well demarcated, deep ulcerative lesion with stenotic narrowing in the ileocecal valve. The diagnosis of intestinal Behcct's disease with an esophageal ulcer was made on the basis of clinical and pathological findings. The patient was treated with steroids and sulfasalazine and the response was favorable.
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, 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>
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.
Malicious Processor Detection based on the Security Agent
Seong-Muk Choi,Yeol-Joo Ryou,Hoo-Ki Lee,Hee-Hoon Cho,Jong-Bae Kim 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.11
Recently, as Internet is widely used due to the increased spread of the internet network, the software with malicious intent is distributed via the internet and its infection path gets various too. In particular, attacks by Bot mainly work at C&C (command-and-control) server but it can be secured just by blocking IP because C&C server runs in form of IP. However, this attacker too gets gradually intelligent as they try to connect periphrastically in order to avoid server blocking. Once these malicious codes infiltrate user’s system, it is not easy to detect it through general detection method while it is running. In this paper, we propose malicious process detection system based on security agent in order to prevent damage caused by malicious code infection from spreading.
( Sang Muk Oh ),( Chang Gyo Park ),( Joo Hee Kang ),( Eun Jung Kim ),( Hee Youn Chee ),( Bong Ho Lee ),( Kyung Bok Lee ) 한국응용생명화학회 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.3
Dieckol, a polyphenol compound extracted from Brown algae, Ecklonia cava, is known to have anti-inflammatory and anti-tumorigenic activities. However, the underlying molecular mechanism by which dieckol regulates cancer cell growth and proliferation remains elusive. Here we report that dieckol extracted from Ecklonia cava inhibited 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced human hepatocellular carcinoma SK-Hep1 cell motility, and that dieckol decreased extracellular signal-regulated kinases 1/2 and c-Jun N-terminal kinases (JNKs) activities, but not p38 Mitogen-Activated Protein Kinase (MAPK), in dose-dependent manner. Dieckol reduced TPA-induced activator protein-1 transcriptional activity. TPA-induced matrix metalloproteinase-9 (MMP-9) activity was greatly reduced in SK-Hep1 cells by treatment of dieckol. These findings suggest that dieckol functions as a potent inhibitor for tumor promoter-mediated MAPK signaling pathways leading to AP-1 and MMP-9 activation thereby regulates cancer cell motility.