• 한국공간구조학회논문집
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• 제4권3호
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• pp.57-63
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• 2004

철근 콘크리트보에 개구부를 설치하여 실내공간을 효율적으로 사용하기 위해 시공되는 유공보는 웨브부분의 단면결손으로 인해 전단력이 지배적으로 작용하는 보를 대상으로 많은 연구가 이루어져 왔으며, 연구내용 또한 보의 전단내력 및 거동에 대한 것이었다. 본 연구에 있어서는 철근콘크리트 유공보 중 휨모멘트가 지배적으로 작용하는 보를 대상으로 내력 및 거동을 규명하는 것을 목적으로 하고 있다. 이를 위하여 7개의 실험체를 제작하였으며, 실험의 변수는 유공의 크기 및 보강유무이다.

• Bulletin of the Korean Chemical Society
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• 제19권5호
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• pp.598-601
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• 1998

• 한국강구조학회 논문집
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• 제8권3호통권28호
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• pp.3-11
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• 1996

To investigate the effect of fatigue crack growth due to the surface residual stress, it is measured the residual stress distribution by x-ray diffraction at the crack tip each constant crack growth in the notch specimens, and quantitively assessed the effect of crack closure caused to the distribution of compressive stress at the crack tip from evaluating crack openning stress using the finite element analysis. It is concluded that the degree of the residual stress distribution at the crack tip is decreased with increasing the crack length. From the fact that it is similar to the crack openning stress ratio, it is found that the compressive residual stress distribution and size is related to the crack closure effect and surface residual stress field with propagating crack in the notch specimens depends on the stress intensity factor range at the crack tip.

• 공업화학
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• 제9권2호
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• pp.268-272
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• 1998

액체금속로 냉각재인 액체 소듐에서 시편의 누출특성을 소듐-물 반응 실험에 의해 조사하였다. 소듐-물 반응 현상의 확인은 물 누출 실험 전후에 Fe, Cr 및 Ni 등과 같은 시편의 조성 변화로 확인하였다. $100kg/cm^2$의 누출 압력으로 4시간 동안 시편의 누출 경로를 통해 물을 누출시킨 결과, 누출경로에서 소듐-물 반응생성물들이 침적되어 있는 것을 확인하였으나, 부식에 의해 누출경로가 완전 파열되어 다량의 수증기가 액체 소듐속으로 빠져나가는 re-openning 현상은 관찰되지 않았다. 시편의 누출경로가 막히는 self-plugging 현상은 소듐-물 반응에 의한 반응생성물과 시편의 부식에 의한 부식 생성물이 주 원인으로 추정되고, re-openning 현상은 시편의 누출경로에서 열적인 transient로 추정되었다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1389-1396
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• 2011

There can be several states of emergency when the train is in operation. In this paper we consider passengers how to escape from emergency states and what facilities they can use by each situation. In general, passengers can escape from a train by manual door openning, emergency ramp and breaking window. Now, we consider which facility is proper to each scenario.

• 한국주거학회논문집
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• 제14권2호
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• pp.109-119
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• 2003

The purpose of this study is to find out how Western modern architecture flowed into Korea in extent of architectural mind after openning the port and what the transformations and architectural characteristics are in the spreading process. Significance of this study can be found as a fundamental work to look into modem architecture in the point of architectural paradigm, the meaning of which is the link between traditional and contemporary architecture through inflow and settling of Western modem architecture in the modern age of Korea.

• 한국농공학회지
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• 제37권5호
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• pp.53-61
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• 1995

Analyses of subsurface drainage effects of farmland with respect to pipe and envelop material are made by the laboratory experiments using soil box to give basic information for the subsurface drainage system planning and design. Three different diameter PVC perforated pipes and a mesh pipe are used with envelop materials such as sand, rice bran, and crushed stone. Steady state subsurface drainage flow rate increased as envelop material changed from sand to rice bran and crushed stone. This indicates that as the hydraulic conductivity of the envelop material increases, the drainage flow rate increases. On the other hand, for a given envelop material, the mesh pipe which has the largest openning area shows the largest flow rate while small diameter PVC pipes show small flow rates. This tells that as the openning area and pipe diameter increase, the flow rate increases, too. Therefore, selection of pipe and envelop material should be made in accordance with the design drainage flow rate. Unsteady state subsurface drainage flow rate with respect to time differs for different envelop material. In case the sand was used as an envelop material, the small diameter PVC pipes show larger flow rates than the large diameter PVC pipe and mesh pipe. When the rice bran was used, the mesh pipe shows the largest flow rate, while small diameter pipes show smaller flow rates. In case the crushed stone was used as an envelop material, the large diameter PVC pipe and mesh pipe show larger flow rates, while small diameter pipes show a little bit smaller flow rates. However, the variation of flow rates among different pipes is the smallest when the crushed stone is used. The flow rate curve with respect to the pipe changes little for the crushed stone envelop which has a large hydraulic conductivity, while that changes much for the sand and rice bran envelops. However, it is difficult to draw a consistent relationship between the drainage flow rate and pipe for all the envelop materials. Since the subsurface drainage experiments are made only under the restricted laboratory condition in this study, further study including field experiment is required.

• 한국주거학회논문집
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• 제16권4호
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• pp.1-7
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• 2005

In this study aim at searching for the basement residential planning of considering outdoor spaces. It look after research results, there should be necessary for the inflow of outdoor environment factors. This basement planning is core's area expending, or installing expended dry areas and acquiring side open spaces, installing arcades, installing atrium or court yard, utilizing maisonette spaces, activating pilotis on ground floors, openning main hall, earth sheltering method, etc. These should be improvement for easy step to change basement floors easily through underground floor extend, major repair, use change of present buildings and needs to the idea through architectural design competition.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2000년도 춘계학술대회 논문집(Proceeding of the KOSME 2000 Spring Annual Meeting)
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• pp.36-44
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• 2000

In his study the simulation was carried out by simplifing and modeling dividing into fuel injectioin pump high pressure pipe and fuel injection valve in the fuel injection system of a low speed marine diesel engine. A computer simulation model was developed using the method of characteristics to analyze the unsteady flow in the fuel injection system considering cavitation and variation of fuel density and bulk modulus. Comparison was commenced between the calculated data and experimental data of pressure and injection quantity at the high pressure distributor in fuel injection system for the training ship "M/V hanara" the effects of the high pressure pipe length diameter plunger diameter nozzle openning pressure were also investigated by simulating results.g results.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.1177-1180
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• 2007

This paper has the objects of deciding dynamic instability regions of thick plates by finite element method and providing kinematic design data for mats and slabs of building structures. In this paper, dynamic stability analysis of tapered opening thick plate is done by use of Serendipity finite element with 8 nodes considering shearing strain of plate. To verify this finite element method, buckling stress and natural frequencies of thick pate with or without in-plane stress are compared with existing solutions. The results are as follow that this finite element solutions with $4{\times}4$ meshes are shown the error of maximum 0.56% about existing solutions, and obtained dynamic instability graph according with variation of opening positions.