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김규한(Kyuhan Kim),이기희(Kihee Lee),편종근(Chongkun Pyun) 한국해양환경·에너지학회 2005 한국해양환경공학회 학술대회논문집 Vol.2005 No.11
Nowadays, aeration is the best known method for increasing the level of dissolved oxygen in water. However, the aeration method produces no benefits in increasing DO in lower boundary of water depth since air drops produced by aeration rise to the surface easily in spite of the fact that dissolved oxygen might be suddenly decreased in lower boundaries of water depth. At these levels, the micro bubble system is a very useful method for increasing the amount of DO because micro bubbles do not rise to the surface of bodies of water that have small diameters. In this study, the new micro bubble system for the real sea area were developed and a variety characteristics of water quality were investigated in the field. Also, the performance of the developed micro bubble system has been examined by long term field investigation.
Active Stratification of Colloidal Particle Mixtures under the Lateral Compression
KyuHan Kim(김규한) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Stratification of a particle mixture is a very interesting process due to the impartment of unique surface properties that are quite different from the interior, which can be utilized in various fields, such as multi-functional coatings and controlled drug-releases. Thus, the related studies have been conducted intensively, and in particular, a self-stratification of particle mixtures have been attracted recently. This self-stratification of particle mixture solutions can be simply formed by evaporating the solvent, but this does not seem to be an appropriate process to achieve a uniformly stratified structures with a large surface area. Therefore, we here introduce a new approach for stratifying the particle mixtures by applying a lateral compression to particle mixture layers at the air-water. Based on this, we successfully report that the uniformly stratified structures are simply achieved with a large area, and the thickness of each particle layer can be even controllable.
지진해일 범람이 해안도시에 미치는 영향에 대한 3차원 수리모형실험
김규한(Kim, Kyuhan),박형수(Park, Hyoungsu),신성원(Shin, Sungwon) 한국해안해양공학회 2012 한국해안해양공학회 논문집 Vol.24 No.6
본 연구에서 건물이 밀집되어 있는 해안도시에서의 지진해일 범람에 대한 평면수리모형실험을 수행하였다. 해안도시는 미국 서해안에 위치한 도시인 Seaside를 1/50으로 축소하여 평면수조에 설치하였다. 본 실험에서 범람지역에서의 지진해일의 파고 및 수평속도 측정하였는데, 31개 지점에서 계측하였으며 입사된 지진해일의 파고는 원형 스케일 10 m로 설정하였다. 범람양상과 속도는 건물의 위치 및 배열상태에 따라 크게 다르게 계측되었다. 또한, 도시의 주요 도로를 따라 계측된 지진해일 범람 파고 및 수평속도를 이용하여 모멘텀 플럭스(Momentum flux)를 계산하였다. 모멘텀 플럭스는 해안선에서부터 육지방향으로 파가 진행하면서 감소하는 일반적인 경향을 나타내었다. 범람파고와 모멘텀 플럭스는 도로가 형성된 구역에서 감쇄가 적게 나타났다. 본 연구를 통해 수평 유속이 구조물에 미치는 외력에 중요한 영향을 준다는 것을 알게 되었다. Laboratory experiments were conducted for tsunami inundation to an urban area with large building roughness. The waterfront portion of the city of Seaside which is located on the US Pacific Northwest coast, was replicated in 1/50 scale in the wave basin. Tsunami heights and velocities on the inundated land were measured at approximately 31 locations for one incident tsunami heights with an inundation height of approximately 10 m (prototype) near the shoreline. The inundation pattern and speed were more severe and faster in some areas due to the arrangement of the large buildings. Momentum fluxes along the roads were estimated using measure tsunami inundation heights and horizontal fluid velocities. As expected, the maximum momentum flux was near the shoreline and decreased landward. Inundation heights and momentum flux were slowly decreased through the road with buildings on each side. The results from this study showed that the horizontal inundation velocity is an important factor for the external force of coastal structures.