Antimutagenicity Screening of Water Extracts from Chinese Herbs with SOS Chromotest with Several Direct Mutagens

Geun-Seoup Song,Byung-Yong An,Il-Keyong Maeng,Yong-Ju Kwon,Sang-Bae Han,Dong-Seong Choi 한국식품과학회 1997 Food Science and Biotechnology Vol.6 No.3

A code select structure for pipeline ADC's

Sang Chan Han,Youn Sun Kim,Bo Eun Kim,Soo Won Kim,Tae Geun Kim 대한전자공학회 1997 대한전자공학회 학술대회 Vol.1997 No.6

A Robustness Analysis of Korea Expressway Network

Sung-Geun Lee(이성근),Chi-Geun Han(한치근) 한국컴퓨터정보학회 2021 韓國컴퓨터情報學會論文誌 Vol.26 No.4

재난과 사고로 인해 고속도로 일부 구간이 폐쇄되는 경우가 발생한다. 이런 상황에서 고속도로망에 기능적으로 어떠한 상황이 발생하는지를 분석한다. 국내의 고속도로 망은 하나의 그래프로 표현할 수 있다. 고속도로의 일부 구간의 차단은 국가적인 재앙으로 번질 수 있다. 본 논문에서는 국내 고속도로 망의 강건성을 분석한다. 고속도로의 강건성은 일부 구간의 차단에 따라 국내 고속도로 망의 교통 통행 상황이 어느 정도 나빠지는지를 말한다. 강건성이 클수록 일부 차단의 효과가 작게 나타난다. 교통망의 하나의 구간의 혼잡도를 평가하기 위해 사용하는 방법으로 구간교통량(V)을 구간의 교통용량(C)으로 나누는 값을 사용한다. 본 연구는 국내 고속도로의 출발지점, 도착지점의 실제 교통량 데이터를 이용하여 고속도로의 강건성을 분석하고, 일부 차단에 따른 교통량의 변화를 실험계산을 통해 분석한다. 본 분석이 실제 국내 고속도로의 정확한 실상을 반영할 수는 없지만, 전체적인 망의 기초적인 강건성을 확인하는 목적으로 충분할 것으로 판단된다. Some sections of the highway are closed due to disasters and accidents. In this situation, it analyzes what kind of situation occurs due to functional failure in the highway network. The domestic highway network can be expressed as a graph. Blocking some sections of the highway can turn into a national disaster. In this paper, we analyze the robustness of the domestic highway network. The robustness of expressways refers to the degree to which the traffic conditions of the domestic expressway network deteriorate due to the blockage of some sections. The greater the robustness, the smaller the effect of some blocking appears. This study is used to evaluate the congestion level of one section of the transportation network, and a value obtained by dividing the section traffic volume (V) by the section traffic volume (C) is used. This study analyzes the robustness of highways by using the actual traffic volume data of the departure and arrival points of domestic highways, and analyzes the changes in traffic volume due to partial blockage through experimental calculations. Although this analysis cannot reflect the exact reality of domestic highways, it is judged to be sufficient for the purpose of confirming the basic robustness of the overall network.

Piezoelectric Properties of (1-<i>x</i>)(0.94Bi_0.5Na_0.5TiO₃-0.06BaTiO₃)-<i>x</i>Ta Ceramics

Han, Wook-Hee,Kim, Jinhwan,Ji, Jae-Hoon,Lee, Bokyung,Lee, Hyun Su,Lee, Sang-Kwon,Kamiko, Masao,Ha, Jae-Geun,Koh, Jung-Hyuk American Scientific Publishers 2018 Science Of Advanced Materials Vol.10 No.12

Reliability Assessment of Electric Traction System on Korea High Speed Train

Sung Il Seo,Choon Soo Park,Young Jae Han,Ki Hwan Kim,Tae Geun Park 한국신뢰성학회 2004 한국신뢰성학회 학술대회논문집 Vol.2004 No.7

Distribution and Behavior of 137Cs According to topography and nature of the soil around Yeong-Gwang NPPs,

Sang-Jun Han,Goung-Jin Lee,Hee-Geun Kim 한국방사성폐기물학회 2004 방사성폐기물학회지 Vol.2 No.4

본 연구에서는 국내 원전이 위치한 지역의 토양에서 의 축적 경향을 파악하기 위하여 원전이 위치한 영광군 관내의 평지와 고산지대인 금정산, 불갑산 및 영광원전으로부터 원거리에 위치한 내장산 등을 대상으로 토양중 의 화학적인 특성과 고도에 따른 의 축적 경향을 평가하기 위한 실험을 수행하였다. 일반적으로 국내 토양 중 의 농도는 불검출 의 범위 내에 있으며 본 연구에서 측정한 평지부분과 고산지대인 원전으로부터 2 km 떨어진 금정산, 약 20 hn 떨어진 불갑산 및 원거리에 위치한 내장산에서도 지금까지의 농도 범위에 들었다. 그러나 고산지대는 평지에서와는 다르게 고도가 증가함에 따라 농도도 증가하는 경향을 보이고 있고, 정상 부분이 하부 부분보다 더 높게 나타났고 영광원전 인근 일반평지부분보다는 의 농도는 배 정도 높은 경향을 나타내었다. 연구결과 의 분포는 지형적 요인(고도) 및 토양의 화학적 요인(양이온치환용량)과 상관성이 큰것으로 나타났다. 지형적 요인으로는 주로 고도를 들 수 가 있는데 높은 고도의 산의 경우 대기중 이 토양에 침투되는 기회가 커짐으로 동일한 토질 조건의 평지 토양에 비해 높은 준위를 나타내었다 토양의 화학적 요인으로는 양이온치환용량이 주요 인자임이 규명되었다. 양이온치환용량은 침적된 을 토양에 고정시키는 능력을 나타내며 같은 지형조건에서 높은 양이온치환용량을 가진 시료가 낮은 양이온치환용량을 가진 토양에 비해 농도는 높은 값을 보였다. This paper shows our experiment is performed to understand the exposure tendency of according to the height of area and also, to supplement it by considering chemical characters of exposed to the soil. The samples we use for this experiment are from the general flat area of Yeonggwang county where it has NPPs, the high places of Keumjung & Bulgap mountains, and Naejan mountain where it is quite far from the NPPs. The data from this experiment show that the exposure of is not harmful since its range is around 252 Bq/kg-dry in most of sampled soils such as from the general flat area, the high place of Keumjung mountain where is 2 km away from the NPPs, the other high place of Bulgap mountain where is about 20 km away from the NPPs, and Naejan mountain where it is far from the NPPs. Not like the general flat area, however, the data show that the higher the area is the more is exposed. That is, at the top of mountains, the more is exposed compared to at the bottom area. It is almost times more than the general flat area of Yeonggwang county where it has NPPs. The data also show that the spread of is deeply related to the geographical(the height of area, rainfall, etc..) factors and chemical factors of soils. As the geographical factors, there are far more chances to be exposed of at the high area of mountains through the air compared to at lower area and therefore, we can get more high-leveled readings of at the high area while it is low-leveled ones at the general flat area even if both of them have the same soil conditions. Regarding the chemical factors of soil, it is clarified that the CEC is the key factor. The CEC means the capability of sticking accumulated into the soil. Hence, the more CEC it has the more high-leveled readings of we get under the same geographical condition.

Fabrication of recyclable superhydrophobic cotton fabrics

Han, Sang Wook,Park, Eun Ji,Jeong, Myung-Geun,Kim, Il Hee,Seo, Hyun Ook,Kim, Ju Hwan,Kim, Kwang-Dae,Kim, Young Dok Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.400 No.-

<P><B>Abstract</B></P> <P>Commercial cotton fabric was coated with SiO<SUB>2</SUB> nanoparticles wrapped with a polydimethylsiloxane (PDMS) layer, and the resulting material surface showed a water contact angle greater than 160°. The superhydrophobic fabric showed resistance to water-soluble contaminants and maintained its original superhydrophobic properties with almost no alteration even after many times of absorption-washing cycles of oil. Moreover, superhydrophobic fabric can be used as a filter to separate oil from water. We demonstrated a simple method of fabrication of superhydrophobic fabric with potential interest for use in a variety of applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly stable superhydrophobic fabric was fabricated using PDMS coated SiO<SUB>2</SUB> nanoparticles. </LI> <LI> The superhydrophobic fabric showed resistance to water-soluble contaminants. </LI> <LI> The prepared sample selectively absorbed oil while repelling water. </LI> <LI> It maintained its superhydrophobicity after many times of oil absorption-washing cycles. </LI> <LI> We showed that the fabric can be used as an effective filter for oil-water separation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Method of Deciding Elastic Modulus of Left and Right Ventricle Reconstructed by Echocardiography Using Finite Element Method and Stress Analysis

Han, Geun-Jo,Kim, Sang-Hyun The Korean Society of Medical and Biological Engin 1994 의공학회지 Vol.15 No.2

In order to study the shape and dimensions of heart, a procedure to reconstruct a three dimensional left ventricular geometry from two dimensional echocardiographic images was studied including the coordinate transformation, curve fitting and interpolation utilizing three dimensional position registration arm. Nonlinear material property of the left ventricular myocardium was obtained by finite element method performed on the reconstructed geometry and by optimization techniques which compared the computer predicted 3D deformation with the experimentally determined deformation. Elastic modulus ranged from 3.5g/$cm^2$ at early diastole to l53g/$cm^2$ at around end diastole showing slightly nonlinear relationship between the modulus and the pressure. Afterwards using the obtained nonlinear material propertry the stress distribution related with oxyzen consumption rate was analyzed. The maximum and minimum of ${\sigma}_1$ (max. principal stress) occurred at nodes on the second level intersection points of x-axis with endocardium and with epicardium, respectively. And the tendency of the interventricular septum to be flattened was observed from the compressive ${\sigma}_1$ on the anterior, posterior nodes of left ventricle and from the most significant change of dimension in $D_{RL}$ (septal-lateral dimension of right ventricle).

A Noble Function of Baicalein: Inhibition of Platelet Aggregation Mediated by an Elevated cAMP-Induced VASP, and Decreased MAPK Phosphorylations

Sung Dae Kim,Jeong Yoon Han,Chang Geun Lee,Kyu Heo,Yoo Soo Park,Joong Sun Kim,Kwang Mo Yang,Man Hee Rhee 대한수의학회 2012 대한수의학회 학술대회발표집 Vol.2012 No.-

Invited Mini Review : Molecular epidemiology of norovirus in South Korea

( Sung Geun Lee ),( Han Gil Cho ),( Soon Young Paik ) 생화학분자생물학회(구 한국생화학분자생물학회) 2015 BMB Reports Vol.48 No.2

Norovirus is a major cause of viral gastroenteritis and a common cause of foodborne and waterborne outbreaks. Norovirus outbreaks are responsible for economic losses, most notably to the public health and food industry field. Norovirus has characteristics such as low infectious dose, prolonged shedding period, strong stability, great diversity, and frequent genome mutations. Besides these characteristics, they are known for rapid and extensive spread in closed settings such as hospitals, hotels, and schools. Norovirus is well known as a major agent of food-poisoning in diverse settings in South Korea. For these reasons, nationwide surveillance for norovirus is active in both clinical and environmental settings in South Korea. Recent studies have reported the emergence of variants and novel recombinants of norovirus. In this review, we summarized studies on the molecular epidemiology and nationwide surveillance of norovirus in South Korea. This review will provide information for vaccine development and prediction of new emerging variants of norovirus in South Korea. [BMB Reports 2015; 48(2): 61-67]