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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.
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.
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.
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(Myeong Sik Park),김인혜(Inhea Kim),허근영(Keun Young Huh),Hai Dang Bui 인간식물환경학회 2021 인간식물환경학회지 Vol.24 No.3
Background and objective: Rural migrants are an important human resource in urban and rural exchange (URE) business, therefore it is necessary to enhance their awareness and intent-to-participate. This study was to analyze the rural migrants’ recognition and intent-to-participate of URE business and to propose the enhancement of them both. Methods: The questionnaire was designed to analyze the socio-demographic background, motivations, satisfaction with settlement, intent-to-persist, and intent-to-participate of URE business including tourism. The data of 144 respondents was subject to the statistical analysis. Results: The motives of migration were to enjoy leisure life after retirement, increased tiredness of city life, health problems, etc. The satisfaction with settlement was 3.67 at 5-point Likert scale. The intent-to-recommend and intent-to-publicize were 3.40 and 3.46, respectively. The intent-to-participate was 3.45, which was affected by the necessity of URE business and the support of central/local governments, and also showed a significant correlation with the satisfaction with settlement, intent-to-recommend, intent-to-publicize, tourism resources for green tourism or rural tourism, driving a car in Namhae county, and the service and price of meals. They thought the missions that the Namhae county office must focus on were to establish an internal/external public relations systems, establish a support system of central/local governments, and foster/support local leaders. Conclusion: It is necessary to improve the satisfaction with settlement and intent-to-persist, expand exchanges with local people, improve internal/external public relations systems, foster/support leaders, improve transportation in the county, enhance the service and price of meals, and develop/operate URE programs including tourism.