• Proceedings of the KSME Conference
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• 2000.04b
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• pp.667-672
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• 2000

The Characteristics of the conical vortices on the roof surface of a low-rise building has been investigated by using a PIV(Particle Image Velocimerty) technique. The scaled model of TTU building with 1:92 scaling ratio was used. The Reynolds number based on the free stream velocity and the length of the model was $1.96{\times}10^5$. When the angle of attack for the building model is $45^{\circ}$, the conical vortices are occurred symmetrically and the center of vortices are changed with respect to the angle of the approaching flow. The rotating direction of the conical vortices found to be counter-rotating. The secondary vortex motions are investigated using the instantaneous flow field data.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2005.10a
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• pp.272-277
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• 2005

Initial mixing characteristics in near field regions were analyzed by FLOW-3D, for analyzing mixing behavior of submerged discharge from freshwater lake in sea water. FLOW-3D model was applied to the region near Geum-ho dike for its verification. Simulation results from FLOW-3D were compared to the observed data for the verification periods. FLOW-3D showed resonable prediction results compared to the observed data, except underestimation in area near outfall. Particularly, FLOW-3D showed a good prediction for movement of buoyancy jets. In addition, FLOW-3D model was applied to the region near Saemangeum dike, which is to be constructed in near future. It was expected that the results of model application to Saemangeum area could provide substantial information in planning submerged discharge facilities. Based on the model applications to Saemangeum area, it was recommended that outfall should be located to the distance which gave an enough depth of outfall from water surface.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.358-359
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• 2001

우리나라 남해 서부 해역에 위치한 진도군 해역은 동부는 남해, 남부는 제주해협과 인접한 다도해로서 그 수심은 50m내의로 말은 천해역을 이루고 있다. 이 해역은 황해저층냉수, 황해난류수, 한국 남ㆍ서 연안수, 양자강 희석수 등 계절에 따라 이들 수계의 영향을 받고 있어 이들 수계간에 형성되는 조경역의 변동이 어장 형성에 영향을 미치는 한편, 부어류의 호어장을 형성한다(Gong and Cho, 1972). 또한 년도별 계절별 해황의 변동과 황해저층냉수의 소장에 따라 갈치, 삼치, 병어 등 주요 수산자원의 풍흉에 영향을 미치는 해양 환경적 특성을 지니고 있다. (중략)

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2008.04a
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• pp.259-265
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• 2008

This research starts from the questioning of current housing development situation on hilly sites in Korea. It aims to investigate various design techniques of row-rise housing as an alternative housing type on hilly sites. Several generic solutions are proposed by considering the density of dwelling, parking plans, exterior space and access patterns, making full use of geographical features of hilly site and existing facilities. In order to promote development feasibility of proposed plans, the efficiency of the proposed techniques are verified in terms of development density, enhancement of community space, habitability of housing.

• Water for future
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• v.25 no.2
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• pp.99-110
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• 1992

A problem of outlet salinity from a stratified fluid with a well developed interface thickness consisting of an upper and lower layer differing slightly in density is considered. Three kinds of apparatus were used for the experimental test and salinity differences between inlet layer and outlet discharge were estimated by the functional relationship using the dimensionless values. For the critical incipient condition of withdrawal of upper layer, Densimetric Froude number is correlated by the inlet diameter and depth ratio in the tank.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.253-256
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• 2008

The objective of this study is to evaluate the seismic weakness of existing nonseismic low-rise piloti-type apartment buildings which have the irregularities of weak story, soft story, and torsion simultaneously. A prototype 4-story RC building was selected, analyzed using linear dynamic procedure and finally evaluated according to the acceptance criteria of FEM356. This building satisfies the criteria.

• Journal of the Korean Institute of Rural Architecture
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• v.16 no.4
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• pp.59-66
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• 2014

This paper deals with vibration of plates with concentrated mass on elastic foundation. The object of investigating natural frequencies of tapered thick plate on pasternak foundation by means of finite element method and providing kinetic design data for mat of building structures. Free vibration analysis that tapered thick plate in this paper. Finite element analysis of rectangular plate is done by use of rectangular finite element with 8-nodes. In order to analysis plate which is supported on pasternak foundation. The Winkler parameter is varied with 10, $10^2$, $10^3$ and the shear foundation parameter is 5, 10. This paper is analyzed varying thickness by taper ratio. The taper ratio is applied as 0.0, 0.25, 0.5, 0.75, 1.0. And the Concentrated Mass is applied as P1, Pc, P2 respectively.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2014.11a
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• pp.81-82
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• 2014

Modular housing has many advantages such as economy, flexibility and reusability. The domestic modular housing of a continuous stacking method has been built in military facilities, and dormitories. However, there is a limit to present diversity of low-rise multi-family housing. A cross stacking method is a way to pursue diversity of that but there is a difficulty to apply it owe to lack of cases and related technologies. Therefore, the purpose of this study is to suggest application techniques in design phase of applying the crossing stacking method in advance.

• Journal of the Earthquake Engineering Society of Korea
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• v.5 no.1
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• pp.37-44
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• 2001

면진기술은 주로 저층 구조물의 내진설계에서 적용되는 방법으로 건물과 기초사이에 면진장치를 설치하여 상부로 전달되는 지진하중을 효과적으로 감소시킨다. 그러나 이 방법은 중.고층 구조물에 그대로 적용하기에는 여러 가지 기술적 문제가 따르므로, 구보물의 중간층 일부를 분리시켜 상부로 전달되는 지진력을 감소시킬 수 있을 것이다. 본 노문에서는 저층 뿐만 아니라, 중.고층 정형구조물의 주상복합건물과 같은 비정형 구조물에 대하여 구조물의 중간층 일부를 비선형 면진장치로 면진시키고 그 효과를 분석하였다. 이러한 중간층 면진 구조물의 경우, 고정기초 구조물에 비하여 적은 층간변위나 층전단력이 발생하였으며, 특히 주상복합건물에서 상당한 효과를 볼 수 있었다.

• Bulletin of the Korean Space Science Society
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• 2010.04a
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• pp.29.3-29.3
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• 2010

남극세종기지 상공 중간권계면에서의 중량파(gravity wave)를 연구하기 위해 세종기지 유성 레이더로 관측한 유성 에코를 분석하였다. 2007년 이후 유성 에코의 공간적 이동으로부터 유성 관측 고도에서의 수평 바람 정보를 지속적으로 수집해왔다. 80-100 km 고도에서의 바람 프로파일에서 지구 규모의 성분인 평균 바람(Mean wind), 대기 조석 효과(Tides)를 제거하여 국지적인 규모의 중량파에 의한 바람 변화폭(wind variance)을 결정하였다. 월 단위로 평균한 결과로부터 중량파가 계절과 고도에 대한 뚜렷한 특징을 보이고 있음을 확인하였다. 남극 지역에서의 중량파는 동서방향의 바람(zonal wind)와 저층 대기의 남극 소용돌이(vortex)와 깊은 관련이 있을 것으로 생각된다. 남극 반도에 위치한 Rothera 기지에서의 관측 결과와의 비교를 통하여, 남극 반도에서 발생하는 중량파가 중간권과 저층 대기 사이에서 어떤 역할을 하는 지를 확인할 수 있을 것으로 기대한다.