• Journal of Korean Society of Coastal and Ocean Engineers
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• v.20 no.6
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• pp.575-582
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• 2008

Carbonation is one of major factors influencing on the durability of concrete structure. This paper investigates the effect of carbonation on the soundness of harbor concrete structure and quantifies the influence of carbonation based on in-situation data tested at 369 points in 69 harbor facilities. The relationships between carbonation depth and cover depth, and between carbonation depth and compressive strength are studied and the failure probability of durability, that is the initiation probability of steel corrosion, is evaluated on the basis of reliability concept. The in-situation test results showed that the ratio of carbonation depth to cover depth was less than 0.2, and the carbonation depth increased with age. In most cases, the failure probability of durability by carbonation was less than 10%. Therefore, it can be concluded that the influence of carbonation on the durability of harbor concrete structure is smaller than other factors deteriorating the durability of harbor concrete structure.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.04a
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• pp.189-190
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• 2010

바다낚시를 여가활동으로 즐기는 사람들의 수가 증가하고 있지만 해수면 낚시용 수상구조물에 대한 규정이 없어 많은 안전사고를 야기하고 있다. 본 연구에서는 해수면의 환경특성과 낚시특성을 파악하여 해수면에서 플로팅 구조물크기설정, 구조물 구조계획, 상부공간계획, 안전시설계획의 4가지 계획단계를 통해 6인용과 12인용 두 가지 타입의 해수면 낚시용 수상구조물 표준모델을 제시하고자한다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.19 no.3
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• pp.237-243
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• 2007

Probabilistic seismic risk analysis was performed. Exceeding probabilities of combined stress and maximum horizontal displacement of steel piled pier due to surface ground motion which was transferred from base rock motion was expressed as seismic fragility curves. Occurrence probability of peak ground motion was calculated by using the seismic hazard map on design code for harbor and fishery structures of Korea. Finally seismic risk of pier structure was found by combining the fragility and the hazard and those were presented through numerical analysis.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.23 no.1
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• pp.11-17
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• 2011

A major source of durability problems in concrete structures is the corrosion of steel by the damage of passivity layer around steel bars. As chloride ion penetration is major cause of the destruction of passivity layer, evaluation of depth and concentration profile of chloride ion is the essential factor for the service-life estimation of concrete structure. To estimate chloride ion penetration characteristics, this paper on the basis of in-situ experimental data investigated the depth and concentration profile of chloride ion penetration. The core specimens are obtained at air-zone, splash zone, and tidal zone in Wando, Masan, Incheon, Gwangyang, and donghae harbors. Colorimentric method measured the chloride ion penetration depth and ASTM C 114 evaluated the concentration profile of chloride ion. Based on experimental data, the influence of harbor location and exposure condition on chloride ion penetration is evaluated.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 1994.07a
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• pp.8-11
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• 1994

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2011.04a
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• pp.307-310
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• 2011

본 연구에서는 항만 구조물의 구조건전성 모니터링을 위한 Imote2 센서 플랫폼 기반의 스마트 무선센서의 적용성을 평가하였다. 이를 위해 먼저, 고민감도 MEMS 가속도계를 탑재한 Imote2 센서 플랫폼 기반스마트 무선센서를 설계하였다. 둘째, 스마트 무선센서노드의 독자적인 구조 상태 모니터링을 위한 내장소프트웨어를 설계하였다. 마지막으로, 모형 케이슨 구조물의 진동실험을 통해 개발된 스마트 무선센서의 성능을 검증하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.05a
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• pp.33-35
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• 2019

해상구조물은 그 특성상 해상에서 고립되어 있고, 액체상태 또는 가스 상태의 탄화수소 등을 다루고 있어 사고발생시 대형사고로 이어질 가능성이 크다. 이에 해상구조물에는 유엔해양법협약에 따라 500m라는 넓이의 안전수역이 설정되어 있으며 추가로 설정되는 제한 수역은 명확한 근거 없이 상이한 넓이로 설정되어 있다. 이에 본 연구에서는 선박의 조종성능 및 해상구조물에서 다루는 화물의 고유한 위험특성을 파악하여 표준화된 안전수역을 설정하는 방안을 제시하고자 한다. 이에는 국제해사기구의 조종성능기준인 선회경의 크기제한, 초기선회성능, 정지성능 등이 있다. 본 연구는 정량화된 안전수역 및 제한수역 설정 등에 대한 기준을 제시하는 데 도움을 줄 수 있을 것으로 사료된다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.1
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• pp.51-56
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• 2006

부유식 해상공항과 같은 초대형 부체 구조물(VLFS)의 연안역 설치 후 발생할 수 있는 배후의 해빈변형을 예측하기 위한 토대를 마련하기 위한 기초 연구를 수행하였다. 이를 위해 일정 사면을 가진 천해역에서의 실험 결과를 통하여 비교적 수심이 깊은 곳에 설치된 매립식 구조물 배후에서의 파랑 및 해빈류를 개관하였으며, 매립식 및 부유식 해상 구조물 설치 시 주변 해역의 파랑 및 해빈류장을 계산하였다. 파랑장에 있어서 라프라스 방정식 토대로 유한요소법을 도입한 3차원 파랑 변형 계산을 수행함으로써 매립식 및 부유식 구조물 모두에 대해 적용 가능하였으며, 해상 구조물의 설치 형식이 매립식 및 부유식 경우에 대해 파랑, 해빈류 분포의 변화를 관찰할 수 있었다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.17 no.1
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• pp.41-46
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• 2005

The seismic response characteristics of a port structure were investigated by the earthquake analyses of the structure subjected to high-, low-frequency component, and Uljin earthquakes. In the Fluid-Structure-Soil Interaction(FSSI) analysis, the fluid is modeled by the 4-node quadrilateral element which is a modification of a structural plane element, and the port structure and foundation is modelled by the plane strain element. Since the present method directly models the fluid-structure-soil interaction system using finite element method, it can be easily applied to the dynamic analysis of a 2-D fluid-port-soil system with complex geometry. The results of the seismic coefficient. added mass, and FSSI methods are compared. The results showed that the earthquake with high frequency components more affects the seismic response of the structure than that of low frequency components.

• Journal of the Korean GEO-environmental Society
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• v.23 no.11
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• pp.13-18
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• 2022

In this study, the suitability of the grouting method will be evaluated by analyzing seismic reinforcement methods for the stability of gravity structure in Port. The evaluation categories are liquefaction, sliding, toppling and circular failure. To compare the appropriateness of the seismic reinforcement method, the low mobility mortar injection, one of the grouting method and the SPC file and GRB method, which are pile wall type reinforcement methods, were evaluated and compared respectively. The object of the evaluation is the gravitational structure of Po-Hang old port. As a result of the evaluation, both the grouting method and the pile wall type reinforcement method are considered to have sufficient stability. Therefore, in the case of the gravity structure, the grouting method is more efficient than the seismic reinforcement method considering construction efficiency, economic efficiency, maintenance and similar construction cases.