Hepatic Cirrhosis Occurring in a Young Woodchuck(Marmota monax) Due to Vertical Transmission of Woodchuck Hepatitis Virus(WHV)

Kyu-shik Jeong,정원일,Jae-yong Chung,Mi-young An,Chae-yong Jung,Gyoung-jae Lee,Jong-soo Kang,Byeong-cheol Kang,Young-heun Jee,Bruce H Williams,Young-oh Kwon,Da-hee Jeong 대한수의학회 2003 Journal of Veterinary Science Vol.4 No.2

Cirrhosis Occurring in a Young Woodchuck (Marmota monax) Due to Vertical Transmission of Woodchuck Hepatitis Virus (WHV)Da-hee Jeong, Won-il Jeong, Jae-yong Chung, Mi-young An, Chae-yong Jung, Gyoung-jae Lee1, Jong-soo Kang1, Byeong-cheol Kang2, Young-heun Jee3, Bruce H Williams4, Young-oh Kwon5 and Kyu-shik Jeong*College of Veterinary Medicine, Kyungpook National University, Daegu 702-701, Korea1Shinwon Scientific Co., LTD, Research Institute, Suwon, Korea2Clinical Research Institute, Seoul National University, Seoul 110-744, Korea3College of Veterinary Medicine, Jeju National University, Jeju 690-756, Korea

Polystyrene composites containing crosslinked polystyrene-multiwalled carbon nanotube balls

Kwon, Soon-Min,Kim, Hun-Sik,Kim, Don-Young,Yun, Young Soo,Jin, Hyoung-Joon Wiley Subscription Services, Inc., A Wiley Company 2008 Journal of applied polymer science Vol.110 No.6

<P>Crosslinked polystyrene-multiwalled carbon nanotube (PS-MWCNT) balls, which act as conductive microfillers, were prepared by the in situ suspension polymerization of styrene with MWCNTs and divinyl benzene (DVB) as a crosslinking agent. The diameters of the synthesized crosslinked PS-MWCNT balls ranged from 10 to 100 μm and their electrical conductivity was about 7.7 × 10<SUP>−3</SUP> S/cm. The morphology of the crosslinked PS-MWCNT balls was observed by scanning electron microscopy and transmission electron microscopy. The change in the chemical structure of the MWCNTs was confirmed by Raman spectroscopy and Fourier transform infrared spectroscopy. The mechanical and electrical properties of the PS/crosslinked PS-MWCNT ball composites were investigated. It was found that the tensile strength, ultimate strain, Young's modulus, and impact strength of the PS matrix were enhanced by the incorporation of the crosslinked PS-MWCNT balls. In addition, the mechanical properties of the PS/crosslinked PS-MWCNT ball composites were better than those of the PS/pristine MWCNT composites. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008</P>

Decoding the Modern Fantasy of `White People, Korean` : An Analysis of Images from `the King Young-jo & Jung-jo` to `the open port era`

Min, Soo hong,Kwon, Young Gull 한국색채학회 2006 한국색채학회 학술대회 Vol.2006 No.1

유지시간 변화에 따른 크리프-피로 수명예측 방법에 관한 연구

권영일,김범준,임병수 成均館大學校 科學技術硏究所 2001 論文集 Vol.52 No.2

In this study, creep-fatigue tests were carried out under the various test conditions using AISI 316 stainless steel. Life prediction was made by three different methods which are the modified Coffin-Manson method, the modified Ostergen method and the artificial neural network method with the adaptive learning rate. The predicted lives were compared with the experimental results and following conclusions were obtained within the scope of this study. Creep-fatigue life prediction by the modified Coffin-Manson method and the modified Ostegren method had the average error of 47.3% and 50.8% respectively whereas the artificial neural network method had only 28.8% for compressive and tensile+compressive hold time. From the obtained results, the artificial neural network method with the adaptive learning rate was proved to be more accurate and effective than the other two methods. The validity of artificial neural network method for life prediction checked with 3 verification data points proved also to be very satisfactory.

AISI 316 스테인리스강의 크리프-피로 상호작용시 수명예측에 관한 연구

권영일,김범준,임병수 成均館大學校 科學技術硏究所 2000 論文集 Vol.51 No.2

The effect of tensile hold time on the creep-fatigue interaction in AISI 316 stainless steel was investigated. To study the fatigue characteristics of the material, strain controlled low cycle fatigue(LCF) tests were carried out under the continuous triangular waveshape with three different total strain ranges of 1.0%, 1.5%, and 2.0%. To study the creep-fatigue interaction, 5 min., 10 min., and 30 min. of tensile hold times were applied to the continuous triangular waveshape with the same three total strain ranges. The creep-fatigue life was found to be the longest when the 5 min. tensile hold time was applied and was the shortest when the 30 min. tensile hold time was applied. The cause for the shortest creep-fatigue life under the 30 min. tensile hold time is believed to be the effect of the increased creep damage per cycle as the hold time increases. Under the total strain range of 1%, significant reduction in life was observed as the tensile hold time was increased compared to the result of 2% total strain range. The theoretical prediction obtained by the Modified Coffin-Manson method and the experimental results of creep-fatigue life were found to be in resonable agreement with each other.

아미노산용액에서 팔라듐의 전기화학적 행동

권영순,이수진 가톨릭대학교 자연과학연구소 1998 자연과학논문집 Vol.19 No.-

팔라듐을 0.01M proline 용액에서 펄스 차이 폴라로그래피법으로 정량하였다. 검출 한계는 4.5×10^(-8)M Pd(Ⅱ)이고 봉우리 전류가 선형인 농도 범위는 6.0×10^(-8)~2.0×10^(-7)M Pd(Ⅱ)이었다. 촉매 수소 전류가 생성되는 메카니즘은 chemisorption이 일어나는 BC과정임을 알 수 있었다. The measurement of trace palladium in 0.01M proline solution by differential pulse polarographic method is described. In this medium the detection limit and the dynamic range are 4.5×10^(-8)M and 6.0×10^(-8)~2.0×10^(-7)M for palladium. The formation mechanism of catalytic hydrogen wave is BC process coupled with chemisorption.

分散 데이타베이스의 效率的인 質疑語의 처리

權寧淡,金重秀,金正洪 嶺南大學校附設 基礎科學硏究所 1988 基礎科學硏究 Vol.8 No.-

The efficient query processing is of im,portance ina distributed database management system. For a class of simple queries, it is possible to design optimization algorithm that will derive optimal distribution strategies. In this paper, a query <Extentended Simple Query> that is extension of simple query is defined. It is not necessary to reduce data transmission cost and to fully eliminate relations in a result site. Efficient algorithm for ESQ that considers semijonin operation sequences is presented.

글로벌·다문화 사회의 통일의식: N세대 대학생을 중심으로

권영승,이수정 대구대학교 다문화사회정책연구소 2011 현대사회와 다문화 Vol.1 No.2

The purpose of this study is to analyze unification consciousness of South Korean university students, so-called the ‘N-generation’ in the global/ multicultural age. By employing ‘focus group interview’ as a research method, it examines these students’ unification consciousness in context, and the process in which unification discourses are formed. These are difficult to find out through existing researches based on survey. Discourses of ‘unification’ as a ‘sacred national goal’ is losing its hegemony in South Korea especially among young generation. However, there are not many studies that examine the characteristics of ‘new’ unification consciousness among them. It is worthwhile to analyze them especially because they will develop into the major unification consciousness that South Koreans will share hereafter. The following are findings of this research. ‘N generation’ university students of South Korea consider ‘unification’ more in terms of practical issues, not in terms of a ‘historical right’ or ‘national wish.’ Rather, they tend to discuss ‘unification’ with the issues of ‘social conflict,’ ‘economic gains and losses.’ Unification is mostly considered in terms of the idea of profit that brings advantages to the whole Korean peninsula. The students are also very negative about the idea of ‘rapid unification,’ worrying about potential social disorder and economic damages. This signifies increasing repulsion and indifference about ‘real unification’ among this generation. 본 연구의 목적은 2011년 현재 ‘N세대’에 해당하는 대학생들이 가지고 있는 통일의식을 질적 연구방법론의 하나인 포커스 그룹 인터뷰(focus group interview) 방법을 통하여 알아봄으로써 기존의 여론조사로는 파악하기 힘든 내면 의식 및 쟁 점, 담론의 형성 과정을 분석하는 것이다. 흔히 일반적인 여론조사에서 대다수의 국민들이 통일이 필요하다고 응답하는 것 은 통일이라는 어휘가 가지는 일종의 당위성이 내면 의식 속에 자리하고 있기 때문이다. 본 연구는 통일의 당위성이 청년 세대들을 중심으로 차차 약화되고 있는 상황과 더불어, 이러한 현상을 촉진하는 원인으로 최근 대두되고 있는 글로벌· 다문 화 현상에 주목하였다. 과거 세대보다 자신의 의식에 솔직하고 기존의 통일 교육으로부터 자유로우며, 북한을 단지 한반도 주변국 중 하나로 인식하는 경향성이 있는 N세대의 등장은 분단 이후 지속되어 온 당위성에 의한 통일의식에 균열을 일으키 고 있다. 기존의 여론조사와 같이 통계로 결과를 표출하는 양적 연구가 아닌, 개인의 의식을 보다 심도 있게 다루는 질적 연구는 청년 세대들이 가지고 있는 보다 솔직한 통일의식 파악에 도움을 줄 수 있다. 이러한 문제의식 하에 본 연구는 서울시 내에 위치한 4년제 대학에 재학 중인 N세대 대학생들을 대상으로 질적 연구방법론의 하나인 포커스 그룹 인터뷰를 진행하였다. 연구 결과 지금의 대학생들은 이미 상당 부분 기존의 통일 당위성에서 벗어나 있었으며, 민족적 감정이 아닌 통일 이후에 발생할 사회적 갈등과 경제적 득실, 그리고 한반도의 발전 가능성 등 현실적 이해관계를 중심으로 통일의 필요성 여부를 사고하고 있었다. 즉, 이제 통일은 점차적으로 한반도 전체에 이득을 가져다주는 실리의 관념으로 전환되고 있으며, 더 이상 ‘우리의 소원은 통일’이 아닌, ‘우리의 소원은 통일로 인한 한반도의 발전’이라는 담론으로 새로이 전환되는 시기를 맞이하고 있다. 또한 N세대 대학생들은 통일의 실현에 대하여서는 상당한 거부감을 동반한 소극적인 모습을 보였다. 이러한 거부감은 주로 통일이 조속히 이루어질 경우에 닥쳐올사회적 혼란과 경제적 손해에 대한 우려와 맞닿아 있으며, 결국 이러한 우려가 보다 자기주장에 솔직한 N세대들에게서 강하게 표출되면서 실질적인 통일에 대한 거부감 및 무관심이 증대되는 특징으로 나타나고 있었다.

여학생 동복 하의 착용시의 생리반응과 주관적 착용감

권수애,오미경,강미영,송혜원,박진채,권리현 충북대학교 교육 ·생활연구소 생활과학연구센터 2002 생활과학연구논총 Vol.5 No.-

In this study, physiological responses and subjective sensations were investigated depending on various high school girls' lower cloth uniform in winter. Four healthy young women were selected, and they wore same underwear and jacket. The types of lower cloth were tight skirt+stocking, flared skirt+stocking, tight skirt+legings+socks, flared skirt+legings+socks, and slacks+socks. The results were as follows: 1) The effect of the type of lower cloth in winter on the skin temperature, humidity inside clothing and subjective sensations were significant. 2) It is desirable for high school girls to wear slacks in winter, Since physiological responses and subjective sensations of slacks are superior to those of skirts. 3) It is desirable for high school girls to wear flared skirt, legings, socks in winter, Since insulation and subjective sensations of flared skirts are superior to those of tight skirts.

Cyclodextrin Glucanotransferase와 Cyclodextrinase를 생산하는 Bacillus 속 세균의 분리와 그 효소들의 특성

권현주,남수완,김광현,곽영규,김병우 동의대학교 기초과학연구소 1997 基礎科學硏究論文集 Vol.7 No.1

A bacterium producing Cyclodextrin Glucanotransferase (CGTase) and Cyclodextrinase (CDase) was isolated from soil, and named as Bacillus stearothermophilus KJ16 . The growth of the isolated strain occurred in two steps, and syntheses of CGTase and CDase were dependent on the growth cycle of the cell. CGTase was constitutively synthesized during the 1st growing phase. while CDase was synthesized inducibly during the 2nd growing phase. When the medium pH was controlled at 7.0, the maximun enzyme activities of CGTase and CDase were increased by 12-fold (1300 mU/ml) and 2-fold (225 mU/ml), respectively, compared with the pH-uncontrolled batch culture. The CGTase of the isolate converted soluble starch to CDs with the ratio of α-CD:β-CD:γ-CD=42:46:12 at 55℃. The optimal pH and temperature of CGTase were 6.0 and 60℃,respectively and the optimal pH and temperature of CDase were 6.0 and 55℃. The molecular weights of the purified CGTase and CDase were estimated to be 65,000 and 68,000 dalton, respectively, Among serveral substrates, γ-CD was most rapidly hydrolyzed by the purified CDase.