水平環狀空間의 熱傳達에서 隔板의 影響

權純錫,李範澈,鄭漢植 東亞大學校 大學院 1988 大學院論文集 Vol.13 No.-

A numerical study have been performed onthe effects of spacers on the heat transfer across a horizontal annulus under basic conditions; Ra=10⁴,Pr=0.7 D??/D??=2.6, K??K=48, ??/D??=0.06 and Nu??=122.5. The mode of heat transfer in the annulus is changed from conduction to convection at Ra??10³. The maximum dimensionless temperature districution along (r-r??)/L at Θ=50?? are founded for vertical spacers but at Θ=120??, for horizontal spacers, and the minimum dimensionless temperature distribution along (r-r??)/L at Θ=50?? are founded for horizontal spacers but Θ=120??, for no spacers. The maximum dimensionless angular velocity at Θ=50??, at (r-r??)/L??0.2 near the inner tube and at(r-r??)/L??0.8 near the outer cylinder but at Θ=120??, it shows at (r-r??)L??0.15 near the inner tube and at (r-r??)L??0.7 for no spacers and vertical spacers and at (r-r??)/L??0.8 for horizontal spacers near the outer cylinder. Finally, the heat transfer by natural convection in the plain annulus is maximum but in the annulus with horizontal spacers in munimum.

大豆의 成分育種에 關한 硏究 : 第3報. 化學成分에 關與하는 遺傳子 分布狀態의 推定 Ⅲ. Estimation of Gene Distributions for Chemical Contents by Diallel Crosses

金鎭馨,韓鏡秀,朴愚喆,張權烈 慶尙大學校 1987 論文集 Vol.26 No.1

大豆成分育種에 대한 기초정보를 얻고자 脂肪, ?白質, P?O?, K?O, CaO, MgO,, ?分 및 水分 等의 含量을 對象으로 化學成分의 特性이 各各 다른 7個品種을 二面交雜하여 F?世代에 發現되는 優性程度 및 遺傳子分布狀態 等을 Vr-Wr Graph로서 推定하였던 바 얻어진 結果는 다음과 같다. 1.分散分析結果, 交配親과 雜種世代間에는 全形質에 걸쳐 高度의 有意性을 보임으로서 品種의 特性에 따른 遺傳的 다양성과 雜種世代의 系統間 差異를 나타내었다. 2.優性程度에서 脂肪, CaO, MgO 및 ?分은 超優性으로, ?白質 및 K?O는 不完全優性으로 遺傳되었다. 3.遺傳子 分布狀態에서 脂肪과 ?白質의 경우, Hill 品種은 ?性 및 優性遺傳子의關與가 많을 것으로 推定되었는데, 특히 ?白質은 含量이 높은 品種들이 優性으로 遺傳되는 不完全優性 이었다. Seven soybean varietics and the seeds in F? generation of all possible crosses among them were used to observe the characteristics of genes controlling eight chemical contents, i,e., fat, protein, P?O?, K?O, CaO, MgO, ash and moisture.Data for F? hybrid seeds and parents were subjected to an analyss methods proposed by Jinks and Hayman. The results obtained are summarized as follows: 1.Mean squares of parents and F? hybrids were signnificant for all chemical contents. 2. In Vr-Wr graphical analyses, the degrees of dominance for fat, CaO, MgO and ash were estimated to be inherited with over dominance was observed for P?O? and moisture. 3. In the gene distributions, Variety Hill which the parental point fell away from the origin possessed the most of recessive alleles for fat and protein.

세포성 면역 알고리즘을 이용한 AGV의 주행제어

이영진,손주한,조현철,이권순 동아대학교 정보기술연구소 2000 情報通信硏究所論文誌 Vol.8 No.1

In this paper, cell-mediated immune algorithm(CMIA) controller was proposed and applied for the autonomous guided vehicle(AGV) driving. It was based on specific immune response of the biological immune system which is the cell-mediated immunity. To verify the performance of the designed CMIA controller, some experiments were performed for the control of steering and speed of AGV. And then the displacement and speed tracking error of the AGV was mainly investigated. As a result, the capability of realization and reliableness were proved by comparing the response characteristics of the classical controller with the proposed CMIA controller

재원기간중 사망한 급성 심근경색증 환자의 임상적 특징

현대우,김기식,신이철,박소영,배장호,한창엽,김윤년,김권배 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.9

국내 하천 퇴적물 건강성평가를 위한 Microtox 독성시험 조건확립 연구

정홍배,박정규,문성환,류태권,김소정,배철한,황인영 한국환경독성학회 2001 환경독성보건학회지 Vol.16 No.4

1. 하천 퇴적물 공극수, 증류수 추출용액 및 유기용매 추출액을 pH6.0~6.5 범위로 조절한 후 Microtox 독성을 측정하는 것이 퇴적물내의 암모니아 독성이 배제된, 유해화학물질 오염에 의한 퇴적물 독성을 평가하는 방안임을 확인하였다. 2. 퇴적물에 대해 공극수, 증류수 추출물, 유기용매 추출물 구분하여 Microtox 독성을 구하는 것이 퇴적물 내 유해화학물질의 독성발현 특성을 예측할 수 있는 기법이라고 사료된다. 3. 조사정점 내 시료 채취 지점간 독성에 편차로 인하여, 동일 정점의 반경 50~100m 내에서 최소 4지점 이상의 퇴적물을 확보하는 것이 해당 정점의 독성 대표값을 산출할 수 있는 방안이 된다고 판단된다. 4. 한강수계인 남한강 지천인 복하천과 양화천, 금강수계인 청주 미호천, 대전 갑천, 낙동강수계인 대구 금호강, 영산강수계인 황룡강 그리고 익산 만경강을 대상으로 한 예비 조사한 결과, 집중연구대상 하천으로의 조건은 금호강이 가장 우수하였다. 5. 하천 퇴적물의 증류수 추출액과 유기용매 추출액의 Microtox 독성값 간의 상호 상관성이 높았다. 그러나, 농축 과정이 용이하므로 정점간 비교를 위한 독성 측정시 유기용매 추출액을 사용하는 것이 바람직하다고 사료되었다. Six rivers were selected as preliminary screening sites to determine the test conditions of Microtox in assessing the toxicity of the sediment. In addition, a pH range of 6.0--6.5 was established in testing pore water, aqueous extracts and organic extracts. Each extractable fraction of sediment showed different toxicities. Therefore, in order to properly examine the toxicity in the sediment, all extractable fractions of sediment samples needed to be tested with Microtox. Thus, sediment samples were additionally collected from at least 4 secondary sites within 50~100 m area of the primary sampling site to reduce any variation or deviation in toxicity assessment. From all sediment toxicity data that was collected from this study, it was concluded that the Keumho river was the most polluted with the highest sediment toxicity of all the rivers analyzed and needed further detailed research on its pollution problem.

열대 지역에서 통일형 초다수성 벼 품종의 생육 및 수량성 비교

이지윤,준현,성환,손영보,송유천,한상익,박동수,권영업,이철원,이종희 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.2

The Economic Growth and the Trend of Participation in Sport for All as Social Change

Han, Tae-Young,Kim, Min-Chul,Kwon, Min-Hyuk,Kim,Kyong-Sik,Kim, Han-Joo,Han, Seung-Back 한국체육무용국제교류학회 2002 한국체육무용국제교류학회지 Vol.8 No.-

The main purpose of this study is to examine the economic growth and the trend of participation in sport for all as a social change. Specifically, we discuss about the relevance between economic growth and sport for all and on the base of these discourse, we investigate economic growth and changes of sport for all from 1986 to 2000. Further more this study may help forecast what future sport for all in Korea will be. The subjects of this research are the actual condition of GNP, the budget for sport, and the ratio of participation in sport for all reported during the year 1985 to 2000. This research has used the statistical method of regression analysis, time-series analysis in order to examine the growth of sport for all and change as economic growth and social change. The results of this study were as follows: First, economic growth influences on the ratio of sport for all is increased. The ratio of participation in sport for all is increased by 7.2%, 33.4%(2000) to 40.6% in 2003.

Competitive Adsorption of CO₂ and H₂O Molecules on the BaO (100) Surface: A First-Principle Study

Kwon, Soon-Chul,Lee, Wang-Ro,Lee, Han-Na,Kim, J-Hoon,Lee, Han-Lim Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.3

$CO_2$ adsorption on mineral sorbents has a potential to sequester $CO_2$. This study used a density functional theory (DFT) study of $CO_2$ adsorption on barium oxide (BaO) in the presence of $H_2O$ to determine the role of $H_2O$ on the $CO_2$ adsorption properties on the ($2{\times}2$; $11.05\;{\AA}{\times}11.05\;{\AA}$) BaO (100) surface because BaO shows a high reactivity for $CO_2$ adsorption and the gas mixture of power plants generally contains $CO_2$ and $H_2O$. We investigated the adsorption properties (e.g., adsorption energies and geometries) of a single $CO_2$ molecule, a single $H_2O$ molecule on the surface to achieve molecular structures and molecular reaction mechanisms. In order to evaluate the coordinative effect of $H_2O$ molecules, this study also carried out the adsorption of a pair of $H_2O$ molecules, which was strongly bounded to neighboring (-1.91 eV) oxygen sites and distant sites (-1.86 eV), and two molecules ($CO_2$ and $H_2O$), which were also firmly bounded to neighboring sites (-2.32 eV) and distant sites (-2.23 eV). The quantum mechanical calculations show that $H_2O$ molecule does not influence on the chemisorption of $CO_2$ on the BaO surface, producing a stable carbonate due to the strong interaction between the $CO_2$ molecule and the BaO surface, resulting from the high charge transfer (-0.76 e).

Change of Nutritional Status Assessed Using Subjective Global Assessment Is Associated With All-Cause Mortality in Incident Dialysis Patients

Kwon, Young Eun,Kee, Youn Kyung,Yoon, Chang-Yun,Han, In Mee,Han, Seung Gyu,Park, Kyoung Sook,Lee, Mi Jung,Park, Jung Tak,Han, Seung H.,Yoo, Tae-Hyun,Kim, Yong-Lim,Kim, Yon Su,Yang, Chul Woo,Kim, Nam-H Wolters Kluwer Health 2016 Medicine Vol.95 No.7

<▼1><P>Supplemental Digital Content is available in the text</P></▼1><▼2><P><B>Abstract</B></P><P>Subjective global assessment (SGA) is associated with mortality in end-stage renal disease (ESRD) patients. However, little is known whether improvement or deterioration of nutritional status after dialysis initiation influences the clinical outcome. We aimed to elucidate the association between changes in nutritional status determined by SGA during the first year of dialysis and all-cause mortality in incident ESRD patients.</P><P>This was a multicenter, prospective cohort study. Incident dialysis patients with available SGA data at both baseline and 12 months after dialysis commencement (n = 914) were analyzed. Nutritional status was defined as well nourished (WN, SGA A) or malnourished (MN, SGA B or C). The patients were divided into 4 groups according to the change in nutritional status between baseline and 12 months after dialysis commencement: group 1, WN to WN; group 2, MN to WN; group 3, WN to MN; and group 4, MN to MN. Cox proportional hazard analysis was performed to clarify the association between changes in nutritional status and mortality.</P><P>Being in the MN group at 12 months after dialysis initiation, but not at baseline, was a significant risk factor for mortality. There was a significant difference in the 3-year survival rates among the groups (group 1, 92.2%; group 2, 86.0%; group 3, 78.2%; and group 4, 63.5%; log-rank test, <I>P</I> < 0.001). Multivariate Cox regression analysis revealed that the mortality risk was significantly higher in group 3 than in group 1 (hazard ratio [HR] 2.77, 95% confidence interval [CI] 1.27–6.03, <I>P</I> = 0.01) whereas the mortality risk was significantly lower in group 2 compared with group 4 (HR 0.35, 95% CI 0.17–0.71, <I>P</I> < 0.01) even after adjustment for confounding factors. Moreover, mortality risk of group 3 was significantly higher than in group 2 (HR 2.89, 95% CI 1.22–6.81, <I>P</I> = 0.02); there was no significant difference between groups 1 and 2.</P><P>The changes in nutritional status assessed by SGA during the first year of dialysis were associated with all-cause mortality in incident ESRD patients.</P></▼2>

고온화학세정 환경에서 EDTA가 증기발생기 구조재료에 미치는 영향 평가

이한철(Han-Chul Lee),권혁철(Hyuk-Chul Kwon),성기방(Ki-Bang Sung) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.2014 No.2

원자력발전소 증기발생기는 전열관 재질이 Alloy-600 HTMA으로 되어 있고, 2차측은 퇴적된 슬러지는 ODSCC 발생 환경을 조장한다. 증기발생기 2차측 부식생성물 제거와 함께 전열관의 응력부식균열의 발생을 억제하기 위하여 고온화학세정을 실시한다. 수행하기 전 재질 의 부식률 및 슬러지 제거량을 평가하기 위하여 Qualification Test를 하였다. 증기발생기 슬러지 제거량은 2,986kg으로 추정되며, 부식률은 최대 7.43mils로서 EPRI 권고사항인 10mils 이내로 만족하였다.