• Bulletin of the Society of Naval Architects of Korea
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• v.33 no.2
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• pp.37-40
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• 1996

본사업이 성공적으로 수행되면 대형 부유식 구조물 기술과 대형 기계장치 기술을 효율적으로 조합하는 대형 복합 해상 플랜트 개발 능력을 확보하게 됨으로써, 해상 플랜트산업을 고부가가치 수출전략산업으로 육성 가능하게 되며, 국내 플랜트 엔지니어링 기술 수준 도약의 계기가 될 수 있을 것으로 판단된다. 또한 사회, 경제적으로도 대형복합 해상 플랜트 개발을 통하여 해상공간을 퉁분히 활용함으로써 육상 용지난을 경감시킬 수 있으며 특히, 계속 증가추세에 있는 육성기피시설물, 예를 들면 폐기물 처리시설, 대형공항, 원자력발전소 등의 수요에 능동적으로 대처할 수 있게 된다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.563-565
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• 2013

해양플랜트 구난기술은 상당 부분 선박구난과 동일하여 수중절단, 인양, 계류, 기름의 이송 및 예인 등은 공통적으로 적용이 가능하다. 그러나 구조물이 복잡하고 대형이며, 심해 설치 등의 특성이 있으므로 해양플랜트 구난작업에는 유형별 구조에 대한 정확한 이해가 필요하다. 해양플랜트 설치, 이송 및 해체 분야에 대한 기술은 구난 분야에도 적용이 가능하므로 해양플랜트 특성에 적합한 구난기술 개발 방향을 제안하였다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.20 no.4
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• pp.401-412
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• 2008

Simulations of three-dimensional numerical wave tank are performed to investigate wave force acting on a large cylindrical structure and consequent wave deformation, which are induced by bore after breaking waves. The numerical model is based on the three-dimensional Navier-Stokes equations with a finite-difference method combined with a volume of fluid(VOF) method, which is capable of tracking the complex free surface, including wave breaking. In order to promote wave breaking of the incident wave, the approach slope was built seaward of the structure with a constant slope and a large cylindrical structure was installed on a flat bed. The incident waves were broken on the approach slope or flat bed by its wave height. In the present study, all waves acting on the large cylindrical structure were limited to breaking bore after wave breaking. The effects of the position of the structure and the incident wave height on the wave force and wave transformations were mainly investigated with the concern of wave breaking. Further, the relations between the variation of wave energy by wave propagation after wave breaking and wave force acting on the structure were discussed to give the understanding of the full-linear wave-structure interactions in three-dimensional wave fields.

• Journal of Ocean Engineering and Technology
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• v.5 no.2
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• pp.16-30
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• 1991

A numerical procedure is described for predicting the dynamic responses of combined systems of floating breakwaters and huge offshore structures supported by a large numer of the floating bodies in waves. The hydrodynamic interactins among tatal floating bodies are taken into account in their exact form within the context of linear potential theory. Wave control effects are discussed with both hydrodynamic interactions and hydrodynamic-structure interaction effects. The method presented is applicalbe to combined systems of floating breakwaters and huge structures for ocean space utilization for which a number of practical uses are seen in the future.

• Journal of Ocean Engineering and Technology
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• v.5 no.2
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• pp.156-156
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• 1991

A numerical procedure is described for predicting the dynamic responses of combined systems of floating breakwaters and huge offshore structures supported by a large numer of the floating bodies in waves. The hydrodynamic interactins among tatal floating bodies are taken into account in their exact form within the context of linear potential theory. Wave control effects are discussed with both hydrodynamic interactions and hydrodynamic-structure interaction effects. The method presented is applicalbe to combined systems of floating breakwaters and huge structures for ocean space utilization for which a number of practical uses are seen in the future.

• Bulletin of the Society of Naval Architects of Korea
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• v.33 no.4
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• pp.31-42
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• 1996

본 고에서는 대형 복합플랜트에 대한 외력작용의 극소화의 구조물 주변해역의 환경개선 및 친수공간 기능 극대화를 위한 해역정온의 기술에 대해 소개하고자 한다. 해역제어구조물의 종류와 각각의 기능적 특성을 정리하고, 국내외의 개발현화을 살펴보며, 핵심 요소기술을 고찰함으로써 대형 복합플랜트 개발을 비롯한 새로운 해역 어용 및 개발에 필요한 해역정온화를 위한 제어구조물의 개발 방향을 논의하고자 한다.

• Journal of Navigation and Port Research
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• v.32 no.3
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• pp.215-221
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• 2008

Dynamic characteristics of a structure, i.e., natural frequency and mode shape, have been widely using as an input data in the area of structural integrity or health monitoring which combined with the damage evaluation and structural system identification techniques. It is very difficult, however, to get those information by the conventional modal analysis method from large structures, such as the offshore structure or the long-span bridge, since the source of vibration is not available. In this paper, a method to obtain the frequencies and the mode shapes of a large span truss structure using only acceleration responses is studied. The calculation procedures to obtain acceleration responses and frequency response functions are provided utilizing a numerical model of the truss, and the process to extract natural frequencies and mode shapes from the modal analysis is cleary explained. The extracted mode shapes by proposed method are compared with those from eigenvalue analysis for the estimation of accuracy. The validity of the mode shapes is also demonstrated using an existing damage detection technique for the truss structure by simulated damage cases.

• Bulletin of the Society of Naval Architects of Korea
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• v.33 no.4
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• pp.13-20
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• 1996

해양공간 활용을 위해 예상되는 부유식 해양구조물은 단위구조들이 결합된 형태의 초대형 구조물로서 단위 구조물간의 탄성변형 문제가 매우 중요시되고 있으며 이에 따라 단위구조물간의 상호작용이 고려된 유체력 산출과 탄성응답이 고려된 해석법의 개발이 전세게적으로 활발히 이루어지고 있다. 독립 부유구조물 자체의 크기가 대형화될 때 발생하는 탄성 변형 또한 구조 해석 및 진동관점에서 중요한 고려사항이며, 이는 조선공학분야에서 유탄성 해석기법에 바탕을 두고 연구가 활발히 진행중이다. 본 고에서는 부유구조물의 설계에 있어 핵심기술중 하나인 파랑응답 해석기술의 현황에 대해 살펴보고 현재 한국기계연구원에서 수행중인 국책연구개발사업 "해양공간이용 대형 복합플랜트 개발"의 세부과제인 "부유구조물 파랑응답 해석기법 개발"의 추진내용에 대해 환경 하중/응답해석기술, 계류시스템 설계/해석기술, 유탄성응답 해석기술로 나누어 소개하고자 한다. 해석기술로 나누어 소개하고자 한다.

• Journal of the Korean Society for Marine Environment & Energy
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• v.18 no.3
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• pp.157-165
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• 2015

This study investigated and compared sediment properties and macrobenthic community structures within heated effluent plumes at the discharge areas of Kori Nuclear Power Plant (KNPP) and Sinkori Nuclear Power Plant (SNPP) in Korea, which have different thermal effluent discharge systems. There were significant differences in sand, clay and organic carbon contents between sediments at the two discharge areas. Species richness and abundance of macrobenthos were higher at the SNPP discharge area than at that of the KNPP, although the values at both areas were comparable to previous studies in coastal areas of eastern Korea.

• Journal of the Korean Society of Hazard Mitigation
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• v.8 no.1
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• pp.63-69
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• 2008

It has an important meaning that the maintenance and management of facility for a onshore construction shall be damaged by oceanic environment. A movement and displacement of these shall be investigated by up-to-date machinery tools like GPS and Lidar and MBES & Gyro. In current a lot of tools and methods for investigation shall be used as a displacement and movement on land mainly. For underwater facility it is very difficult to check because of special conditions below the water surface. In this study, a surveying methods for a movement and displacement of underwater facility as caisson shall be used, i.e. multibeam-echo-sounding system. A possibility as basic data for displacement and environmental monitoring shall be studied by MBES to acquire a caisson's inclination.