• 환경위생공학
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• 제21권4호
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• pp.61-76
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• 2006

A Line Density algorithm was developed to quantify the sea surface temperature distribution using NOAA Sea Surface Temperature(SST) data and Geographic Information Systems(GIS), In addition, a GIS based automation model was designed to extract the Line Density Indices were determined by applying K-means Cluster. SST data in terms of March to May obtained on the coastal area of the Uljin from 2001 to 2004 in spring were used to make two data sets of average sea water temperature map in terms of year as well as month. From the result it was formed that water temperature gradient in April was the strongest among the other months, In particular very strog formation of oceanic front as well as temperature gradients were observed in front of the coastal area around Wonduk and Jukbyeon countries. Because those coastal area is a confront zone of two cold and a warm. It is expected that the development of a Line Density Algorithm would contribute to quantify of the SST for the research of Sea Surface Front(SSF) related to marine life management and the sea environmental conservation.

• 한국항만경제학회지
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• 제23권4호
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• pp.244-265
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• 2007

최근 외국항만들은 그 특성에 따라 다양한 유형의 워터프론트를 조성하여 도시민의 생활향상과 항만배후단지의 또 다른 부가가치를 창출하고 있다. 그러나 우리나라의 경우 높은 무역의존도에 따라 항만은 단순한 화물처리공간으로써 기능에 중점을 두어 개발되었으며 현재 개발중인 신항의 경우도 외국항만들이 다양한 유형의 워터프론트를 조성하고 있는데도 불구하고 단순 공원조성외 에는 별다른 워터프론트에 대한 계획이 없다. 따라서 본 논문은 신항을 물류기능과 시민들의 휴식하고 즐길 수 있는 친수공간(water front) 그리고 동시에 제반업무를 수행할 수 있는 생활공간이 함께 갖추어진 종합적인 항만공간으로 개발하기 위한 외국항만사례를 중심으로 몇 가지 워터프론트 방안을 제시하면 다음과 같다. 첫째, 물류 주거단지의 인접지역에 광장 조경시설 등 어항의 환경정화를 위한 시설설치 둘째, 이용자의 편익향상을 위한 워터프론트 개발 셋째, 외국 관광객을 위한 위락시설내 워터랜드 건설 넷째, 항만배후단지내 상징물 건설 다섯째, 항만배후물류단지의 미관지구지정 등을 들 수 있다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(2)
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• pp.930-931
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• 2005

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(2)
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• pp.1289-1290
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• 2005

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.237.2-237.2
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• 2010

Although oscillating water column type wave energy devices are nearing the stage of commercial exploitation, there is still much to be learnt about many facets of their hydrodynamic performance. The techniques of Computational Fluid Dynamics (CFD) are applied to simulate a wave energy conversion device in free surface such as waves. This research uses the commercially available ANSYS CFX computational fluid dynamics flow solver to model a complete oscillating water column system with savonius turbine incorporated at the rear bottom of the OWC chamber in a three dimensional numerical wave tank. The purpose of the present study is to investigate the effect of an average wave condition on the performance and internal flow of a newly developed direct drive turbine (DDT) model for wave energy conversion numerically. The effects of blade angle and front lip shape on the hydrodynamic efficiency are investigated. The results indicated that the developed models are suitable to analyze the water flow characteristics both in the chamber and in the turbine. For the turbine, the numerical results of torque were compared for the all cases. The results of the testing have also illustrated that simple changes to the front wall aperture shape can provide marked improvements in the efficiency of energy capture for OWC type devices.

• 한국방재학회 논문집
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• 제10권1호
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• pp.65-72
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• 2010

본 연구에서는 댐 붕괴로 인한 홍수파에 영향을 미치는 도시지역의 효과에 대해 두 가지 수리모형실험에 근거하여 수치적으로 분석되었으며, 계산된 지점별 수심은 측정결과와 비교적 잘 일치하였다. 첫 번째 수리모형실험에 대해 도시지역 전반부에서 상대적으로 높은 수심영역과 흐름의 지체현상이 발생하였으며, 홍수파의 원활한 전파에 큰 장애요소가 됨을 알 수 있었다. 두번째 수리모형실험에 대해서는 유입량의 증가에 따라 도시지역의 전반부에서 후반부로 전파될 때 수심은 급격히 감소하는 구간과 느리게 감소하는 구간으로 구별되며, 도시지역 전반부에 도달하는 홍수파의 최초시간은 유입량이 증가함에 따라 감소되는 경향을 나타내었다.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 춘계학술대회논문집
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• pp.252-255
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• 2008

In this study, the characteristics of crossing a river of Ground Armored Vehicle (GAV) were evaluated by numerical method and real size tests. 3-D hybrid mesh systems were constructed by 3-D models of the GAV, and a commercial software, FLUENT, was used in numerical analysis. In order to deal with multi-phase problem (air and water), Volume Of Fluid (VOF) method was used, and Moving and Deforming Mesh (MDM) was adapted for unsteady motion of GAV. There were two steps in this research. Firstly, stability of the GAV which cruised a river was evaluated by changing several shapes of water-proof-front-wing of the GAV in steady state, and compared results (free surface shape and drag value in 10km/h) with those of real size tests. Secondly, results of unsteady analysis considering weight and moment of inertia of the GAV were presented. There were showed a maximum velocity with a designed water jet and dynamic stability including pitch, roll, and yaw moment. Based on these results, the optimal shape of water-proof-front-wing of the GAV was determined for a proto-type of the GAV.

• 한국수산과학회지
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• 제37권3호
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• pp.232-248
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• 2004

In order to utilize fisheries resources under a joint management scheme with adjacent nations, as well as detecting of fishing grounds, the factors which influence yellow croaker (Pseudosciaena polyactis) in Korean waters were studied using historical catch per unit effort and oceanographic data. The main fishing ground near Cheju Island was located along the thermal front formed between the Yellow Sea Bottom Cold Water (YSBCW) and northward moving warm current. When the YSBCW (index temperature: $10^{\circ}C)$ strongly extended southward, the fishing condition were worse than average. Especially, low temperatures greatly influenced stow net fisheries, which were operated in the deep water layer The concentration and dispersal of fishing ground and catch coincided with oceanographic features and the seasonality of water masses.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 1998년도 학술발표회 논문집
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• pp.632-637
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• 1998

The purpose of this study of this study is to find tide and tidal current variation by three dimensional numerical model of tide and tidal current in the bay of Cheonsu in Korea. On the basis of the observed data on water temperature and salinity data and wind data of summer(July) in the bay of Cheonsu in Korea, water circulation in the bay of Cheonsu is investigated with use of a robust diagnostic numerical model, including calculated co-range and co-tidal charts of M2 tide are similar to the observed ones. The residual flow Pattern at the surface layer during summer formed clockwise circulation in the front coastal the dike of the Sosam A zone(Ganwor island) and Taeju island. The residual flow pattern at the 15m layer during formed clockwise circulation in the front Taeju island. The residual flow Pattern at the surface layer formed anti-clockwise circulation in the upper Sangmok and Naepasu island.

• 한국해양공학회지
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• 제10권2호
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• pp.120-135
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• 1996

The characteristics and fluctuations of structures and spatial distributions of thermal fronts and warm eddy in the Southeastern part of the East sea are discussed based on the data collected by the Naval Academy, Korea during Feb. 6-9, May 9-19 and Oct. 12-18, 1995. The thermal fronts existed very often at the sea off the Pohang-Ulsan, The generation of the thermal front is related with the development of the North Korea Cold Current. The warm eddy is located in the central part of the Ulleung basin where the local depth exceeds 1500m. This warm eddy is a major contributor to mass transport in the northern part of the East Sea. It is evident that knowledge of warm eddy is important in understanding the circulation in the western part of the East Sea.