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역압력구배하에서 윗벽면 및 평판슬릿흡입이 난류경계층의 구조에 미치는 영향
박계향,이학성,윤명식,유상신 한국항공대학교 1994 論文集 Vol.32 No.-
역압력 구배하에서 벽면흡입과 모델 평판의 슬릿흡입이 난류 경계층구조에 미치는 영향에 대하여 실험적으로 연구하였다. 압력탭이 설치된 평판을 실험부에 설치한 후 평판위에 역압력구배가 작용되도록 하고 경계층 내의 속도 분포와 난류강도를 열선유속계로 측정하였다. 역압력구배가 커지면 경계층의 천이점은 평판의 상류쪽으로 이동하며 평판의 벽면에서 슬릿흡입을 하면 경계층내의 난류강도가 감소하고, 흡입량을 증가하면 난류 강도는 더욱 감소한다. An experimental study on the boundary layer structure on the flat plate with upper wall and slit suction under adverse pressure gradients is presented. Velocity profiles and turbulent intensities in the boundary layer are measured by hot-wire anemometer system. The transition point of a bondary layer moves upstream direction as the adverse pressure gradient increases. Slit suction causes a reduction of turbulent intensity of boundary layer. Reduction of trubulent intensity increases as the suction coefficient increases.
張忠植,朴秉洙,李明奎 國立統營水産專門大學 附設 水産科學硏究所 1993 수산과학연구소보고 Vol.4 No.-
통발 구멍의 直徑을 4단계로 만들어 1988年 10月 중에 南部海域에서 釜山水産大學 實習船 402호와 403호로 操業을 하여 어획한 붕장어 Astroconger Myriaster의 全長을 측정하여 붕장어에 대한 張(1987)의 어체제원간 관계식 妥堂性과 플라스틱 통발 구멍의 適正直徑을 알아본 結果를 要約하면 다음과 같다. 1. 魚體諸元間의 關係式 D=0.07L-0.59 은, 통발 구멍의 直徑 D값에 대한 全長 L값 이상으로의 漁獲率이 Pl, P2, P3와 P4 각각 97.4, 94.9, 100.0 96.0%로 매우 妥堂性이 있다. 2. 붕장어 플라스틱 통발 구멍의 適正直徑은 적어도 1.5cm 이상은 되어야 한다. The authors carried out an experimental fishing of Sea eel (Astroconger Myriaster) Pots to find the accuracy of the relationship formula between body dimensions and the optimum diameter of pot hole. The diameter of pot hole was used by an experimental fishing were 0.7, 0.9, 1.0, 1.5, 2.0 cm. The number of pot were 271, 278, 283, 296 respectively. An experimental fishing was performed during october, 1988 in the Southern Sea of Korea. The results obtained can be summarized as follows; 1. The relationship formula between body dimensions was very accurate. 2. Optimum diameter of pot hole must be made 1.5 cm at least.
Computer를 利用한 Radiater製品鑄物不良 要因分析에 관한 연구
康景植,朴明圭 명지대학교 1983 明大論文集 Vol.14 No.-
The cause of radiator casting defects are studied by computer analysis. Each factors used for the computer work are classified and coded as macro-, semicro-, and micro- classification. They are correlated each other and simple and multiple correlationships ate obtained. The results are discussed in terms of PN and CR value which are determined from this work and summarized as following. 1. The principles of PN and CR value can be used for processing examination directly. 2. The existence or nonexistence of the simple and multiple correlationships can give the criteria to check out cause of defects promptly. 3. The numbers included in each factor also can be used to define the cause accurately.
조주환,박명식 조선대학교 학생지도연구소 2004 生活指導硏究 Vol.23 No.1
This study investigates the concept of gravity possessed by high school students. 100 students Moonsung High School in Gwangju were tested for the study. They were encouraged to write explanation about their choice in written multiple-choice questionnaires. The test instrument consists of 8 items, all involving some concepts of gravity. By analysing students' responses and comments, the patterns of thinking were categorized and the proportion of those were calculated. Summerized results are as follows; 1. Higher grade students explained questions with a lot of physical concepts but it was not appropriate to apply those concepts to the given situations. 2. In case of the lower grade students there were more responses of intuitive thinking than of rational one. 3. Because students commonly saw the direction of the force as being necessarily in the same direction as the motion of an object, they had a wrong idea hat gravity acts only on falling motion. 4. Many students had also a wrong idea that the falling speed is closely related with the magnitude of gravity or air resistence in falling motion. 5. Most of students did not estimate the relation between height and gravitational field strength.
박명식(Park, Myeong-Sik),심재연(Shim, Jae-Yeon) 대한부동산학회 2015 大韓不動産學會誌 Vol.33 No.2
본 연구는 경로분석 모형을 이용하여 도시형 생활주택 가격에 영향을 미치는 요인들간의 관계성을 규명하고자 하였다. 공간적 범위로는 서울시 25개구의 도시형생활주택을 대상으로 하였으며 시간적 범위로는 2012년까지 준공된 도시형 생활주택을 중심으로 연구를 진행하였다. 경로분석을 위한 변수로는 주변환경특성, 문화복지특성, 교통입지특성과 도시형생활주택 규모, 가격으로 선정하였으며 각각의 구성개념을 대변할 수 있는 측정변수들에 대한 자료를 수집하였다. 마지막으로 상관분석, 다중공선성 검토를 통하여 변수를 검증하였고 확인적 요인분석을 실시하여 변수의 타당성을 검토하였다. 경로분석결과, 주변환경, 문화복지, 교통입지 특성은 주택규모에는 영향을 미치지 않았지만 가격에는 영향을 미치고 있었으며 주택규모의 경우 가격에 영향을 미치고 있어 주택규모는 가격에 직접적인 영향을 미치되 다른 요인들에는 영향을 미치고 있지 않음을 알 수 있었 다. 본 연구의 결과는 향후 도시형 생활주택의 규모 및 가격 결정에 기초자료로 활용될 수 있을 것이다. Main purpose of the study is investigating a relationship with influential factors on the price of urban-life housing using path analysis model. It was focused on urban-life housing types of 25 districts within Seoul as a spatial scope and it started to researching based upon completed new urban-life-housing in 2010. It selected surrounding environment, cultural characteristic and welfare, easily located transportation, these housing sizes, and its own prices as variables of path analysis and then collected some materials like measured variables which were represented each constructs. Finally it verified the variables through an examination of correlation analysis and multicollinearity after then it was inspected a propriety of the variables by confirmatory factor analysis. According to the result, surrounding environment, cultural characteristic and welfare, easily located transportation were not affected the housing size however, it worked on the housing price. Furthermore, the housing size directly influenced the housing price but it was not much impacted by the others. Therefore this study will be useful resources to decide the further urban-life-housing type sizes and prices.