• 태양에너지
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• 제20권2호
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• pp.1-8
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• 2000

The present study has been conducted to offer geometrically optimal structure of a storage tank for a regenerator, one of the components of an open-type dehumidifying and drying system using solar energy to develop an alternatives for time-limited energy such as a fossil fuel, and to decrease an environmental pollutant. Two kinds of model classified by the mixing process were suggested to estimate the amount of regeneration rate. One was the stratified-type, "case 1", a method to place an entrance in the upper part of the tank and an outlet in the lower part. The other was the mixed-type, "case 2", a method to place vice versa. Solution temperature and concentration were used to evaluate the regeneration rate. As a result, the regeneration rate was better in "case 2".

• 한국해양학회지:바다
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• 제8권3호
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• pp.340-348
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• 2003

한반도 남해안의 중앙부에 위치한 광양만에서 표층퇴적물의 시ㆍ공간적 변화를 조사하기 위하여 표층퇴적물과 부유퇴적물에 대한 퇴적학적 조사를 실시하였다. 표층퇴적물은 광양만이 개발되기 이전에는 섬진강 삼각주를 중심으로 서측을 향해 세립해지는 동-서 방향의 분포를 보였으나, 광양제철소가 건설된 이후에는 섬진강 삼각주가 파괴되고 동-서 방향의 분포로 변화하였다. 또한, 광양 컨테이너부두와 각종 산업단지가 조성된 최근에는 동-서 방향의 분포가 파괴되고 남-북 방향의 분포로 변화하였으며, 만의 남서측을 중심으로 평균입도가 뚜렷하게 세립해지는 경향을 보였다. 이와 같은 현상은 광양만 개발에 따른 조류에너지의 감소에 기인한 것으로 해석되며, 이러한 세립화는 개발이 진행됨에 따라 더욱 가속화 될 것으로 생각된다. 한편 부유퇴적물의 분포 특성과 거동에 관한 연구 결과, 광양만에서 부유퇴적물은 만 내부로 유입되는 양이 외부로 유출되는 양에 비해 많았으며, 부유퇴적물의 유출입은 남측보다는 북측의 만 입구를 통해, 그리고 표층과 중층보다는 저층을 통해 주로 이루어지고 있음이 확인되었다. 따라서 광양만은 퇴적우세환경으로 표층퇴적물의 세립화는 만 외부에서 공급되는 부유퇴적물(주로 점토)의 집적에 의해 주로 이루어지는 것으로 해석된다.

• 수산해양기술연구
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• 제56권2호
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• pp.114-125
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• 2020

In order to understand the currents around Hampyung Bay and Haeje Peninsula, 2D numerical simulations for tidal currents and tide-induced residual currents were carried out. Dominant semidiurnal tidal currents have reversing form and flow NNE-SSW from northern Haeje Peninsula to Songi Island, E-S at northern Haeje Peninsula and NNW-SSE in Hampyung Bay. In flood, a part of currents from Imja Island~Nakwhol Island flow along the main stream flowing northeast at offshore region and the rest flow into Hampyung Bay flowing east along the northern coast of Haeje Peninsula. In ebb, currents from Hampyung Bay flow west along the northern coast of Haeje Peninsula and run together with the main stream flowing southeast at offshore region. The currents create an anticyclonic circulation in flood and a cyclonic circulation in ebb around Haeje Peninsula including Hampyung Bay. Tidal currents are accumulated on Doripo which located at the entrance of Hampyung Bay and show high current velocities. Tidal currents and tide induced residual currents are weak at the inside of Hampyung Bay which has narrow entrance, shallow water depth and wide intertidal zone. An anticyclonic eddy is formed around Gaksi Island as a result of tide induced residual currents. In northern coast of Haeje Peninsula, slow constant currents flow east. It is expected that a gradual change of sediment and an increase of flushing time for suspended materials are carried by tidal currents occurring in Hampyung Bay.

• 대한기계학회논문집B
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• 제22권2호
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• pp.139-152
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• 1998

In the present study, the flow characteristics of developing laminar oscillatory flows in a square -sectional 180 deg. curved duct are investigated experimentally. The experimental study using air in a square-sectional 180 deg. curved duct is carried out to measure velocity distributions with a data acquisition and LDV (Laser Doppler Velocimetry) processing system. In this system, Rotating Machinery Resolver (RMR) and PHASE program are used to obtain the results of unsteady flows. The major flow characteristics of developing oscillatory flows are found by analyzing velocity curves, mean velocity profiles, time-averaged velocity distribution of secondary flow, wall shear stress distributions, and entrance lengths. In a lower dimensionless angular frequency, the axial velocity distribution of laminar oscillatory flow in a curved duct shows a convex shape in a central part and axial symmetry. The maximum value of wall shear stress in a lower dimensionless angular frequency is located in an outside wall, but according to increasing the dimensionless angular frequency, the maximum of wall shear stress is moved to inner wall. The entrance lengths of laminar oscillatory flows in a square-sectional 180 deg. curved duct is obtained to 90 deg. of bended angle of duct in this experimental conditions.

• 천문학회보
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• 제37권2호
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• pp.138.2-138.2
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• 2012

Cave on the Moon is considered as the most appropriate place for human to live during the frontier lunar exploration. While the lava flows, the outer crust gets cooled and solidified. Then, the empty space is remained inside after lava flow stops. Such empty space is called the lava caves. Those lava tubes on the Earth are formed mostly by volcanic activity. However, the lava tubes on satellite like Moon and planet like Mars without volcanic activity are mostly formed by the lava flow inside of the crater made by large meteorite impact. Some part of lava tube with collapsed ceiling appears as the entrance of the cave. Such area looks like a deep crater so called a pit crater. Four large pit craters with diameter of > 60 m and depth of > 40 m are found without difficulty from Kaguya and LRO mission image archives. However, those are too deep to use as easily accessible human frontier base. Therefore, now we are going to identify some smaller lunar caves with accessible entrances using LRO camera images of 0.5 m/pixel resolution. Earth's lava caves and their entrances are well photographed by surface and aerial camera in immense volume. Thus, if the image data are sorted and archived well, those images can be used in comparison with the less distinct lunar cave and entrance images due to its smaller size. Then, we can identify the regions on the Moon where there exist caves with accessible entrances. The database will be also useful in modeling geomorphology for lunar and Martian caves for future artificial intelligence investigation of the caves in any size.

• 한국농촌건축학회논문집
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• 제13권1호
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• pp.29-36
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• 2011

This paper aims to clarify the residential quarter organization and housing spatial form of fishing village in Eocheong-do Island. The results are as follows. First, island residential quarter is formed along the coastline, the detached house and the shop house are mainly located in the front of the coastline. Second, the inclination road which connects the northernmost end part and the seashore road is maintained as a road system of a residential quarter from the Japanese colony term until now. Third, It is the feature that Eocheong-do island has the wide width of the front of a site compared with other island residential quarters. Therefore, the frontage wide of a building is also large. Fourth, the entrance of the building where the frontage is mainly located right in the middle, and each rooms are located in the surroundings of it. Finally, the typical community space of Eocheong-do island is Pyeongsang(平床). Pyeongsang is space which receives various functions in inhabitants' life cycle.

• 교육시설
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• 제10권2호
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• pp.5-13
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• 2003

This paper attempts to verify the possibilities of sharing facilities in adjacent elementary and middle school. To achieve these purposes, the educational theories are reviewed and several schools are surveyed. The outcomes from this study are as follows : (1)It is possible and effective to share some facilities in the adjacent elementary and middle schools. To achieve the successful sharing effects, it is necessary for the schools concerned to collaborate heartfully in managing school facilities and in operating school curriculum. (2)This study recommends some school facilities such as the dinning room and kitchen, multi-purpose auditorium, administrative part and nursing room. (3)It is more effective that the sharing facilities be located in the adjacent zone and two playground and main entrance be detached from the other territorial zone.

• 공학교육연구
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• 제20권4호
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• pp.51-60
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• 2017

The purpose of this research is to analyze the educational experiences of competent engineering students and finding the reason why they invest their time and efforts engaging in school activities. Five students with high GPA, high K-CESA scores and successful employment or entrance test scores, participated in the survey and the interview. In checking their responses, their activities' records were gathered from school DB. According to the modified framework based on the personal investment theory, the interviews, survey and DB records were analyzed on the sense of self, the social cultural environment, and pattern of behaviors in schools. The competent engineering students are able to manage themselves, in maintaining a good relationship with the collegiate, and in having high self-efficiency. They also tend to put effort into their studies and participate in inbound and outbound school activities. At the last part, freshmen foundation, relationship within college, students' activity related future career, economic stability during studies are suggested for supporting students in universities.

• 보험의학회지
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• 제2권1호
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• pp.116-121
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• 1985

We've reviewed 518 cases of claims by death that had occured for one year from April, 1983 to March, 1984. As a result, we came to following conclusions; First, the greater part of the death were due to Accidental death(19.1%), Heart disease(18.9%), Malignant neoplasm(17.4%), Liver cirrhosis(10.6%), and the Cerebrovascular disease(9.7%), which were occupied by 75.7% of the whole. Second, classifying them by medical examinations or non medical, death in case of non medical examination showed 89% of the whole. And for age, section ranging from 41 to 50, from 51 to 60 and from 31 to 40 took the overwhelming portion by 27.4%, 26.6%, and 17.4% respectively, those of which showed 71.4% of the whole. Third, for the period elapsed, death within 1 year from the entrance showed 31% and that from 1 year to under 2 years 20.5%. Thus the rate of early death under 2 years stood for 51.5% of the whole.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부 C
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• pp.1054-1060
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• 1998

Previous counter-current flow limitation (CCFL) and critical heat flux (CHF) studies included investigations on the inlet entrance, inclined channel and gap effects for the most part. In this study, the local CHF correlation was presented to be used in the numerical analysis for the 3 dimensional hemispherical geometry. Also, first-principle analyses were performed to determine the maximum heat removal capability from the debris through the gap that may be formed during a core melt accident. The maximum heat removal capability by gap cooling can be applied in quantitatively assessing the severe accident management measures.