• 대한교통학회지
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• 제20권3호
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• pp.31-39
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• 2002

본 연구는 신호교차로의 좌회전 용량을 파악하기 위하여 bay차로를 포함한 좌회전 이동류의 용량산정 모형을 개발하는데 목적이 있다. 본 연구에서는 신호교차로의 혼잡을 완화시키기 위해 설치 운용되고 있는 좌회전 bay 차로의 용량을 파악하여 보다 정확한 용량산정치 적용을 통한 교차로 운영의 분석자료를 제시하고자 한다. 연구방법은 좌회전 bay길이를 20∼120m까지 변화시키며, bay차로와 전용차로에 대한 차두시간을 분석하였다. Bay차로의 용량산정을 위해 차두시간과 차량유출행태 특성에 따라 1구간(출발손실구간:SLP), 2구간(포화차두구간:SFP), 3구간(차로선택구간:LSP)으로 구분하여 분석하였다. 수집된 차두시간 자료로 차량 대기위치순서별로 분석하였다 자료의 통계적 검증을 통하여 구간대별 평균차두시간을 설정한 후, bay길이별 용량산정 모형을 도출하였으며, 이를 이용하여 bay길이별 좌회전 용량을 산출하였다.

• 건축역사연구
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• 제24권3호
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• pp.17-29
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• 2015

This study is about the change of multi-storied buildings in Hanyang, the capital city of Joseon Dynasty. The changes are divided into 3 phases in the viewpoint of architectural types and building types. The first phase is from the early Joseon Dynasty to the time of Japanese invasion to Korea and Sungryemun remains until now. The second phase is from 1592 to the the first half of the 18th century. Many multi-storied Buddhist halls were rebuilt at that time. In the final phase, many multi-storied gate buildings and multi-storied main buildings of palaces were rebuilt. And there are differences between the Buddhist buildings and the main buildings of palaces. By the way the change that architectural style of the Buddhist buildings and the main buildings of pal were switched and mixed occurred. For example, Anguksa Daeungjeon adopted the style of multi-storied gates and Injeongjeon adopted the style of multi-storied Buddhist halls. These phenomenon was result from periodical situation the monk carpenter and his disciple took part in governmental construction like Janganmun.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2004년도 학술대회지
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• pp.114-119
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• 2004

Floating marina has been interests as an alternative to the facilities for recreational boats because of its cost effectivenes and less environmental conflicts. For tile present research, a square floating marina with a length of 400m and draft of 5m was used. This marina can be extended to 800m by putting anotjer one together. Tidal field around tile marina was simulated using a multi-level finite difference method. Tidal motion was assumed sinusoidal in a closed rectangular bay. Velocities and residual current were investigated for two cases of single marina and two marinas installed in tile bay. It was found that the horizontal velocity fields from the water surface to the structure bottom around tile marina were affected. In the marina basin, magnitude of velocity was reduced considerably but overall quality of water circulation was preserved even after two marina were installed.

• 한국건설관리학회논문집
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• 제20권1호
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• pp.52-61
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• 2019

2017년 6월 30일 국토교통부는 주차단위구획의 최소 크기를 확대하는 것을 입법 예고하였다. 주차단위구획의 확대는 주차장 연면적의 증가를 초래하여 아파트 분양가를 상승시킬 우려가 있다. 그러므로 주차장의 기둥 간격과 개수를 조정하고, 주차효율이 좋은 8-Bay 장스팬 주차모듈을 적용할 필요가 있다. 연구결과, 주차단위구획을 확대한 6-Bay 주차모듈과 8-Bay 주차모듈의 공사비는 거의 비슷한 수준이었으나, 8-Bay 주차모듈의 연면적 감소 효과가 확인되어 8-Bay 주차모듈이 더 경제적인 것으로 나타났다. 8-Bay 주차모듈의 공사비를 분석한 결과, 탈형데크플레이트 RC공법을 적용한 모듈이 가장 경제성이 있는 것으로 나타났다. PC 복합화공법은 부재의 체적 증가로 인해 비교적 공사비가 높게 나타났으나, 프리스트레스를 적용하여 보 춤을 감소시키면 경제성을 확보할 수 있을 것으로 확인되었다. 또한 중공슬래브 공법 모듈은 가장 공사비가 높게 나타났으나, $1m^2$당 공사비가 가장 낮아 비용적 측면에서 아파트 주차장의 구조공법으로 적용 가능성을 확인하였다. 이 연구는 8-Bay 주차모듈의 공사비를 분석하고 비용적 측면에서 경제성을 확인하였다는 점에서 의의를 가지며, 향후에 8-Bay 주차모듈을 적용한 최적의 공법을 도출하는데 기초자료로 활용될 것으로 기대된다.

• 한국환경과학회지
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• 제29권10호
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• pp.969-979
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• 2020

A numerical simulation was conducted on perfluorooctane sulfonate (PFOS) in the Gwangyang Bay using a multi-box model to estimate the transport of organic chemicals in the coastal environment. The results of the sensitivity analysis on dissolved PFOS and PFOS in Particulate Organic Carbon (POC) indicate that they were most significantly influenced by the adsorption rate, desorption rate, and sinking velocity coefficients. PFOS in phytoplankton was found to be sensitive to bio-concentration and the excretion rate. The results of the mass balance indicate that the standing stocks of PFOS in water, POC, and phytoplankton are 345.55 g, 63.76 g, and 0.11 g, respectively, in the inner part and 149.90 g, 27.51 g, and 0.05 g, respectively, in the outer part. Considering flux in the inner part, adsorption to POC had the highest value among transition paths. The next highest were desorption, outflow to the outer part, and inflow to the inner part. Outflow into the open sea was found to have the highest value for the outer part.

• Structural Engineering and Mechanics
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• 제86권6호
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• pp.765-778
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• 2023

This study investigates the free vibration and buckling analyses of isotropic curved plate structures fixed at all ends. The Kirchhoff-Love Plate Theory (KLPT) and Finite Element Method (FEM) are employed to model the curved structure. In order to perform the finite element analysis, a four-node quadrilateral element with 5 degrees of freedom (DOF) at each node is utilized. Additionally, the drilling effect (θ_z) is considered as minimal to satisfy the DOF of the structure. Lagrange's equation of motion is used in order to obtain the first ten natural frequencies and the critical buckling values of the structure. The effects of various radii of curvatures and aspect ratio on the natural frequency and critical buckling load values for the single-bay and two-bay curved frames are investigated within this scope. A computer code based on finite element analysis is developed to perform free vibration and buckling analysis of curved plate frames. The natural frequency and critical buckling load values of the present study are compared with ANSYS R18.2 results. It has been concluded that the results of the present study are in good agreement with ANSYS results for different radii of curvatures and aspect ratio values of both single-bay and two-bay structures.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.690-690
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• 2003

The purpose of this study is to analyze the geological environment changes of tidal flat in the Hampyeong Bay. Especially, it centers on the changes in the sedimentary environment using remote sensing data. Multi-temporal Landsat data were used in this study. Remote sensing methods can be effectively applied for quantitative analysis of geological environment changes in tidal flat.

• Structural Engineering and Mechanics
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• 제28권4호
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• pp.479-489
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• 2008

In this study an approximate method based on the continuum approach and transfer matrix method for static and dynamic analyses of stiffened multi-bay coupled shear walls is presented. In this method the whole structure is idealized as a sandwich beam. Initially the differential equation of this equivalent sandwich beam is written then shape functions for each storey is obtained by the solution of differential equations. By using boundary conditions and storey transfer matrices which are obtained by these shape functions, system modes and periods can be calculated. Reliability of the study is shown with a few examples. A computer program has been developed in MATLAB and numerical samples have been solved for demonstration of the reliability of this method. The results of the samples show the agreement between the present method and the other methods given in literature.

• 한국해양공학회지
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• 제13권2호통권32호
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• pp.147-158
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• 1999

Warm or waste water discharged from offshore-based facilities often causes environmental polution as it is transported to coastal area due to tidal actions. In this research a floating-type current control structure is introduced in order to reduce the pollutant spreading in the coastal area. Effectivenss of the structure is investigated through the numerical experiment which is based on a 3-D finite difference multi-level scheme. The warm-water spreading in the bay is reduced when the draft of the structure increases and its optimum draft is found to be between 0.25h and 0.65h, where h is the water depth. The proposed structure is also tested in the Gohyun Bay and it ts proven to be applied to controllling pollutant spreading if its draft is properly chosen.

• Structural Engineering and Mechanics
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• 제70권4호
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• pp.421-429
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• 2019

This paper presents an analytical model for the estimation of initial lateral stiffness of steel moment resisting frames with masonry infills. However, rather than focusing on the single bay-single storey substructure, the developed model attempts to estimate the global stiffness of multi-storey and multi-bay frames, using an assembly of equivalent springs and taking into account the shape of the lateral loading pattern. The contribution from each infilled frame panel is included as an individual spring, whose properties are determined on the basis of established diagonal strut macro-modeling approaches from the literature. The proposed model is evaluated parametrically against numerical results from frame analyses, with varying number of frame stories, infill openings, masonry thickness and modulus of elasticity. The performance of the model is evaluated and found quite satisfactory.