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화학센서를 위한 유기 용해성이 좋은 도전성 고분자가 포함된 전체 고체상태 이온 선택성 전극에 대한 연구
김중일 ( Joong Il Kim ),박정호 ( Jong Ho Park ),장원 ( Won Jang ),허민 ( Min Heo ),나영호 ( Young Ho Na ),신재호 ( Do Young Kim ),김도영 ( Jae Ho Shin ),엄환섭 ( Hwan Sub Um ),이상우 ( Sang Woo Lee ),김인태 ( In Tae Kim ) 한국유화학회 2013 한국응용과학기술학회지 Vol.30 No.2
분광학적인 방법으로 규명하였다. 포텐티오메트릭 이온 선택성 막 전극들은 넒은 감응범위(104~107)와, 시료의 혼탁도에 영향을 주지 않으며, 빠른 감응 시간과 소형화가 쉬운 이유로 병원, 환경과 산업 현장에서 널리 이용되고 있다. 이 전극의 막에는 강한 흡착과 열적인 안정성에서 뛰어난 상온에서 경화시킨 (RTV)-타입 실리콘 고무가 사용되었다. 불행하게도, 이 실리콘 고무 기반의 전극의 높은 막 저항(PVC 기반의 것과 비교하여 102~103배 더 높은 수치)이 응용에 제한이 되어 왔다. 여기에서 우리는 실리콘 고무 막에 전도성 고분자를 첨가 하여 막 저항이 줄어든 새로운 고체 전극을 구현하였다. New conducting polymers containing heterocyclic ring with carbazole, EDOT and benzobisthiazole were synthesized and characterized by organic spectroscopic methods. Potentiometric ion-selective membrane electrodes (ISMEs) have been extensively used for ion analysis in clinical, environmental, and industeial fields owing to its wide response range (4 to 7 orders of magnitude), no effect of sample turbidity, fast response time, and ease of miniaturization. Considerable attention has been given to alternative use of room temperature vulcanizing (RTV)-type silicone rubber(SR) owing to its strong adhesion and high thermal durability. Unfortunately, the high membrane resistance of SR-based (ISMs)(2 to 3 higher orders of magnitude application. Herein we demonstrate a new method to reduce membrane resistance via addition of new conducting polymer into the SR-based ISMs.
Various Structural Approaches to Analyze an Aircraft with High Aspect Ratio Wings
Anas El Arras(엘 아라스),Chan Hoon Chung(정찬훈),Young-Ho Na(나영호),SangJoon Shin(신상준) 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.11
This paper presents an aeroelastic analysis of an air vehicle with high aspect ratio wings. The first approach emphasizes on the nonlinear behaviors of the wings and the unsteady subsonic aerodynamic forces acting on it. Besides, the second approach uses a one dimensional, Euler-Bernoulli, linear beam. The structural analysis results obtained from both beam models are validated with the 3-D NASTRAN finite elements model. The present model considers two control surfaces and has a taper ratio of 0.5, 21 ribs, and 3 spars. The structural mode shapes and natural frequencies are applied for both the linear and non-linear beams, and then the aerodynamic force is obtained and is compared with the unsteady aerodynamic force that comes from the 3-D model. The forces are obtained using ZAERO and then used to perform the flutter analysis.
곰소만 조간대 퇴적물의 Landsat ETM+ 자료 특성
류주형 ( Joo Hyung Ryu ),최종국 ( Jong Kook Choi ),나영호 ( Young Ho Na ),원중선 ( Joong Sun Won ) 大韓遠隔探査學會 2003 大韓遠隔探査學會誌 Vol.19 No.2
이 연구에서는 곰소만 조간대에서 현장 시료채취와 동시에 얻어진 Landsat ETM+ 자료를 이용하여 조간대 환경요인들이 ETM+에 의해 관측된 반사도와 어떤 관계를 가지고 있는 지 밝히고, 광학위성영상을 이용한 조간대 표층퇴적물의 분류의 적용 가능한 기준입도를 제시하고자 하였다. 일반적인 퇴적학적 분류 기준이 되는 4φ 입도를 기준으로 했을 때 입도와 영상의 반사도 간의 상관관계는 매우 낮은 것으로 나타났으나. 2φ 이상의 입자를 기준으로 하였을 때는 상부조간대의 천주변에 작은 입자로 구성된 지역의 자료들을 제외하면 ETM+ 밴드 4번과 0.699의 높은 상관계수를 보인다. 즉, 입도 2φ를 곰소만 조간대에서의 광학위성 자료에 의한 표층퇴적물 분류를 위한 기준입도로 사용하는 것이 타당하다. 입도와 함수율은 비교적 높은 음의 상관관계를 보이며 특히 입도 2φ 기준과는 -0.811로서 뚜렷하게 음의 상관관계를 보인다. 위성자료의 Factor analysis 결과는 지형요소에 의해 크게 영향을 받는 독일의 조간대와는 다른 특성을 보이며, 이는 곰소만의 경우는 입자가 세립하여 지형보다는 함수율에 더 큰 영향을 받는 것으로 나타났다. 결국 조간대 원격탐사에서는 입도뿐만 아니라 함수율과 지형 등의 환경요소가 함께 고려하여야만 한다. A field survey and Landsat ETM+ image acquisition carried out simultaneously. Using these data, we attempted to establish relationships between tidal flat environmental factors and reflectance observed by ETM+, and to set up a new critical grain size useful for optical remote sensing. Although the grain size of 4φ has been conventionally used as a critical size by sedimentologists, the correlation with optical reflectance was very low. Instead, the grain size of 2φ showed a relatively high correlation coefficient, 0.699, with ETM+ band 4, except near tidal channels in upper tidal flat. We concluded that the grain size of 2φ would be better to use for a critical grain size in Gomso Bay. The grain size also correlated well with moisture content having a correlation coefficient of -0.811 when the 2φ criterion was used. The results of factor analysis showed moisture content was more important parameter than topographic relief, and they were different from German tidal flats in which topographic relief was the prior factor. This can be explained by finer grain composition of the Gomso bay tidal flat. In short, moisture content and topography as well as grain size should be considered in tidal flat remote sensing.
김병호,이정일,김효종,장영운,이동근,동석호,김경진,장린,조황래,나영호 대한소화기학회 2000 대한소화기학회지 Vol.36 No.6
Background/Aims: DNA hypomethylation has been observed in some human neoplasms and implicated as an important factor in carcinogenesis. This study was designed to determine whether DNA hypomethylation occurs during the process of gastric carcinogenesis and to evaluate the relationship between the degree of DNA hypomethylation and the stage of cancer. Methods: A total of 49 subjects were classified histologically into normal controls (n=10), erythematous gastritis group (n=13), chronic atrophic gastritis group (n=13), and gastric cancer group (n=13). The extent of DNA methylation was assessed by incubating DNA from gastric mucosal tissue with (3H)-methyl-S-adenosylmethionine and Sss1 methylase. A higher incorporation between DNA and exogenous (3H)-methyl group reflected a lower degree of intrinsic methylation. Results: Global DNA hypomethylation was increased according to the severity of disease as follows: normal (13,430 dpm/μg/DNA), erythematous gastritis (28,900 dpm/μg/DNA), chronic atrophic gastritis (6750 dpm/μg/DNA), gastric cancer (83,490 dpm/μg/DNA) (p$lt;0.0001). Global DNA methylation in chronic atrophic gastritis and gastric cancer was decreased significantly compared with that in erythematous gastritis, respectively (p$lt;0.01, p$lt;0.001). However, no difference in DNA methylation was observed between chronic atrophic gastritis and gastric cancer (p$gt;0.05). DNA hypomethylation did not correlate with cancer stage. Helicobacter pylori infection did not affect the DNA methylation. Conclusions: Global DNA hypomethylation occurs in the early stage of gastric carcinogenesis. The degree of DNA hypomethylation do not increase with progression of the stage of cancer.