코일형 곡관에서 층류맥동유동의 전단응력분포

박우룡,유영태,모양우,최주호 順天大學校 1992 論文集 Vol.11 No.1

The characteristics of the shear stress distributionsrare studied theoretically and experimentally for the laminar steady flow and the laminar pulsating flow generated by butterfly valve in the coiled pipes with the curvature ratio of 30. The shear stress distributions are abruptly changed from θ = -60˚~-40˚ in the plane direction. The shear stress distributions for the laminar steady flow and the pulsating flow increase abruptly near the wall.

심부전증에서 Doppler Tissue Image를 이용한 비동시성 심실수축(Myocardial Dyssynchronicity)의 측정 : 심전도와비교 Comparison with EKG

구소영,조구영,한성우,최승혁,박우정,두영철,홍경순,오동진,이영 대한순환기학회 2004 Korean Circulation Journal Vol.34 No.4

Virus 에 감염된 대추나무의 이병엽과 (罹炳葉) 건전엽에 (健全葉) 있어서의 유리 (遊離) amino 산의 정성적 비교

홍순우(Soon Woo Hong),하영칠(Yung Chil Hah) 한국식물학회 1961 Journal of Plant Biology Vol.4 No.1

Hong, Soon-Wooe and Yung-Chil, Hah (Dept. of Botany, Seoul National University, Seoul, Kerea.) A compantive investigation of free amino acids in healthy and virus diseased Chinese date tree. Kor. Jour. Bot. 4 (1)9~12 1961 : A comparative investigation of free amino acids content in healthy check and virus diseased leaves of Chinese date tree, Zizyphus jujuqa Mill var. inermis Rhed, was carried out by authors throughout the growing season of 1959 and 1960 from June to October. The methods of qualitative analysis of free amino acids applied in this experiment is followed by Moore and Stein.^(1.2). free amino acids determined in this experiment are shown in Fig. 1 and Table 1. As the figure and the table are shown, three more amino acids such as glutarmine, asparagine and histidine are detected in the diseased material. The additiolal amino acids which are known as diamines in diseased leaves are conspicuous. It is presumed that the diamine might be increased by the self-reproduoion of the virus in cooporation with certain enzymes which are carrying out the protein metabolism in the host protoplast in contrast with the healthy checks which is carrying out normal protein metabolism,^(3.4.5). From the histological point of view, the facts of phloem degeneration or necrosis in diseased leaves, it seems to interrupt to move free amino acids from roots to leaves and it possibly takes place an excessive productitn of NH_3 which is diaminated by the metabolism of nitrogen compounds in such conditioned leaves.^(6.8) Therefore, it is also presumed that additional diamino acids are accumulated in diseased leaves. There are no change of amino acids in both materials of this plant throughout the growing season qualitatively, and this result agrees with the paper of Knight.^9

韓國兒童 蒙古斑의 統計的 考察

禹榮根 醫藥係社 1957 綜合 醫學 Vol.2 No.9

웹 기반 학습에 있어서의 상호작용적 자기조절학습 전략 연구

한건우,김영식,이영준 한국컴퓨터교육학회 2004 컴퓨터교육학회 논문지 Vol.7 No.5

최근 웹 기반 학습의 우수성이 크게 대두되고 여러 방면의 연구들이 진행되고 있으나 학습자의 주도적인 참여를 요구하기 때문에 이를 극복하려는 연구가 필요하다. 본 연구에서는 기존의 웹 기반 학습 시스템이 가지고 있는 결함을 보완하기 위해서 학습 환경을 촉진시키기 위한 자기조절학습 전략을 개발하였다. 자기조절학습 전략은 일반적이고 추상적인 내용으로 구성되어 있어 이를 구체적으로 구현하기 위한 하위 전략들을 도출한다. 또한 좀 더 체계화된 시스템 개발을 위해 하위 전략 요소에 대한 상호작용적 설계를 하여 보다 진보된 웹 기반 학습 시스템을 구축하고 이를 검증하였다. Many web-based learning systems have been developed and used widely. Most of the researches on web-based learning systems assume learners' active participation in the learning activity. However, learners do not always actively participate in the learning. This paper presents a novel self-regulated learning strategy to create a learning environment that encourages learner's active participation. We have derived sub-strategies that can be implemented as a web-based system. The derived sub-strategies have been implemented as an advanced web-base system and are verified by an empirical study.

염색폐수처리에서 유동성 메디아를 사용한 산소활성슬러지법의 평가

김우항,박영규 木浦海洋大學校 2000 論文集 Vol.8 No.1

The dyeing wastewater containing biologically recalcitrant and color producing compounds such as dyes and surfactants, is generally considered to be one the most complex wastewater with regard to treatability. At present, the activated sludge process following the chemical coagulation process is being usually used for the treatment of dyeing wastewater. Thus, it is necessary to develop the more simple treatment process to treat refractory organic pollutants color form the effluent. Oxygen activated sludge process with fluidized midia (OASFM) was tested to evaluate design parameters. In this study, the complex dyeing wastewater containing average COD_(Mn) 660 mg/l and BOD 1730 mg/l were treated by the OASFM process which operated at nearly constant MLSS 5000 mg/l. Hydraulic retention time of this process was changed from 12 to 24 hours. The effluent COD of OASFM process was 124-175 mg/l less than 161-225 mg/l of OAS process. In the OASFM process, the optimum conditions were 20 % of media packing rate and 30℃ of temperature. At that condition, the BOD removal efficiency was 99% and COD removal efficiency was 77%.

Factor analysis of Water Quality and Ecosystem in Jinhae Bay

홍순우,하영칠,안태석 江原大學校 附設 環境硏究所 1989 環境硏究 Vol.6 No.-

진해만의 6개 정점의 표·지층에서 1976년 7월부터 1982년 12월까지 물리화학적, 생물학적인 환경요소를 65회에 걸쳐 조사하였다. 이들 자료를 통계학적인 분석을 통하여 진해만의 수질및 생태계에 영향을 미치는 요인을 분석하였다. 그 결과 행암만 내부에 위치한 정점 6 을 제외한 전 해역에서 식물성 플랑크톤의 이상증식이 주요한 요인으로 생태계의 44∼56%의 변화를 설명할 수 있었으며, 정점 6 에서는 영양염류가 중요한 요인이 됨을 알았다. 두번째 요인으로는 담수의 유입으로 볼 수 있었으며, 이 요인은 외해로 나갈수록 그 영향이 적어져, 정점 4 에서는 의미가 없었다. 질소의 유입도 각 정점에서 주요한 요인이었으며, 그 외에 유기물의 증가, 도시하수의 유입, 영양염류의 침전 및 미생물에 의한 염류의 재순환과 광합성이 진해만에서의 수질과 생태계를 지배하는 주요 요인으로 확인되었다. In Jinhae bay, the physicochemical, biological and ecological surveys were carried out 65times at six sites both insurface and bottom water from July 1976 to December 1982. Twenty one abiotic andbiotic parameters were determined on each sample. These data were subjected to factor analysis to scrutinize the effects of environmental conditions on water quality and ecosystem. The phytoplankto blooming was the major factor of the variance of the water quality and ecosystem in Jinhae bay. Fresh water inflow was second factor at site 1 and 6, and it was third factor in site 3 and 5. The nitrogen inflow was also play an improtant role, which was second factor at site 2, 3, 4 and 5, and third factor at site 1. Beside above factors, the increasing of organic materials, waste water in flow, precipitation and recycling of nutrients, upwelling of sediment, nutrient, salts and photosynthesis were also determined for the variation of water quality and ecosystem.

生産性을 考慮한 切削加工에 對한 最適切削條件의 自動選定에 關한 硏究

李吉雨,金泳祥 홍익대학교 산업기술연구소 1996 産業技術 Vol.6 No.-

In recent years machining turns to flexible manufacturing. Industry in machining requires to increase machining productivity and to reduce costs. To adapt this trend it is necessary to optimize machining condition Even though many researches in this are introduced various way to set the optimal condition, still there are not enough. Therefore this research was done to select the optimal cutting condition for industry, and to develope the computer program to select the optimal cutting condition automatically. Also, this program was applied to many companies, and compare costs per minute. The results of this research will contribute to increase machining productivity of various companies with the automatic selection of optimal cutting condition.

발작성 상실성 빈맥 발현전 자율신경 긴장의 변동 : Ⅰ. 노인의 심방 빈맥을 대상으로 Ⅰ. Evaluation of Atrial Tachycardia in the Elderly

신영우 대한노인병학회 2002 대한노인병학회지 Vol.6 No.1

술폰화 폴리스티렌-디비닐벤젠 혼성중합막의 제조와 특성에 관한 연구

한정우,선용호,조영일,이광재 연세대학교 산업기술연구소 1991 논문집 Vol.23 No.1

Sulfonated polystyrene-divinylbenzene (PS-DVB) copolymer membranes were prepared using different diluents and varying diluent volume and DVB contents. All membranes were reinforced with Teviron (PVC) cloth. Three different diluents (toluene, cyclohexane, cyclohexanol) were used in the polymerization system. The membranes have been characterized by their swelling ratio, water content, ion-exchange capacity and mechanical strength. The volume as well as kind of diluents, and DVB content influenced these properties. As a result, water content and ion-exchange capacity decreased with increasing DVB concentration. Among diluents, cyclohexanol was the most efficient for building up the highest water content and ion-exchange capacity.