• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.06a
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• pp.428-430
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• 2012

플로팅 건축물은 현장 시공에 제약 조건이 발생할 가능성이 높아 현장 시공을 최소화할 필요가 있다. 이 연구에서는 현장 시공을 최소화할 수 있는 모듈러 설계를 플로팅 건축물 상부공간에 적용하기 위하여, 먼저 프로젝트 초기 단계에서의 고려 사항을 검토하였고, 소규모 레저용 플로팅 주거공간을 대상으로 모듈러 설계를 적용하는 방안을 시도하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.275-277
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• 2013

2013년 여름 미국 동부지역 플로팅건축 답사를 통하여, 이 지역의 플로팅건축의 현황 파악과 전문가 인터뷰를 통하여 우리나라 플로팅건축 건립 시 필요한 참고자료를 제공하고자 한다. 이 지역은 플로팅건축이 주로 여름철용으로 이용되고 있으며, 대부분 4-5채에 불과한 소규모이며, 폰툰은 스티로폴+플라스틱 드럼으로 구성되고, 계류는 목재와 철재 돌핀으로 처리되고 있으며, 상부시설은 목구조로 계획하고 있고, 정온수역에 플로팅건축을 계획할 때도 태풍에 대한 철저한 대비가 필요하다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.264-266
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• 2013

프리스트레싱으로 연결된 반강접 함체의 응답을 확인하기 위하여 일체형 함체를 기준으로한 실험을 수행하였다. 또한, 실험값과의 비교를 위하여 동-수역학 해석을 수행하였다. 그 결과, 실험에서 나온 피치 가속도는 상부 구조물의 유무와 상관없이 반강접 함체와 일체형 함체가 비슷하게 나타났으며, 해석값과는 1.2초의 주기를 제외하고 다른 주기에서는 비슷한 결과를 나타내었다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.10a
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• pp.294-296
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• 2012

플로팅홈의 역사가 오래된 미주지역의 답사를 통하여, 플로팅홈의 연혁과 현황을 파악하며 거주민의 의식을 조사하여 우리나라 플로팅건축 건립시 참고자료를 제공하고자 한다. 연구조사결과를 정리하면 다음과 같다. 플로틴홈을 건축으로 인정받고 있고, 폰툰은 대부분 목재로 구축되고, 계류는 목재와 철재 돌핀으로 처리되고, 화재에 대한 대비가 철저하고, 대지나 건축규모가 커지고 다양해지고 있으며, 자연환경보존에 대한 고려가 요구되고 있다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.24 no.5
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• pp.604-610
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• 2018

Recently, due to the rapid growth of the leisure industry, demand for small-scale flotation and mooring pontoon platforms has been increasing rapidly. Standard rules for the design and structural safety of such structures have become necessary. This paper provides criteria that can be referenced when designing pontoon platforms, and also introduces structural safety evaluation procedures. In this study, the structural safety and stability of a 15-meter pontoon platform were investigated through structural design and finite element analysis. For platforms of less than 10 meters in length, a simple structural calculation can be used, but for platforms over 10 meters, a detailed structural strength review must be considered to meet safety guidelines defined in existing regulations. The structural strength of the initial design was examined and its structural safety was verified. For future research, it is an evaluative system was developed that can be used to examine the various loading conditions during design.

• Journal of the Earthquake Engineering Society of Korea
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• v.8 no.2
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• pp.27-33
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• 2004

Dynamic response analysis is conducted for a floating bridge subjected to multiple support earthquake excitation. The floating bridge used in this study is supported by discrete floating pontoons and horizontal pretension cables supported at both ends of the bridge. The bridge is modeled with finite elements and the hydrodynamic added mass and added damping due to the surrounding fluid around pontoons are obtained using boundary elements. During the analysis the concept of retardation function is utilized to consider the frequency dependency of the hydrodynamic coefficients. Multiple support excitation is introduced at both ends of the bridge and the time history response is compared to that of a simultaneous excitation. The results show that the multiple support excitation yields larger values in some responses. for example in cable tensions. than the sumultaneous excitation.

• Journal of the Society of Naval Architects of Korea
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• v.35 no.2
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• pp.38-50
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• 1998

In order to understand the characteristics of floating breakwaters we planned series of experimental and numerical investigations and completed the first stage which is the experiment with fred pontoons near the free surface. As controlling parameters the draft and breadth of pontoon were varied and the wave frequency and steepness were also varied. Wave transmission and forces exiled on the breakwater were experimentally investigated and compared with the results computed based on linear potential theory. Discussions made are on the effect of draft and wave length on the wave transmission and force in fixed pontoon case. The predicted and measured results show quantitatively good agreement both in forces and transmission coefficient. The effect of separation distance between two pontoons on the wave transmission and force in array case is also examined.

• Special Issue of the Society of Naval Architects of Korea
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• 2017.10a
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• pp.105-108
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• 2017

Condensation is one of the common issues which we can easily see in everyday life. For example, the surface of glasses with cold water is easily moisturized. This wet surface gives us uncomfortable feeling and is sometimes dangerous because it is slippery. As the safety on working space is one of the most important issue on offshore project, condensation is also important matter to take care of with precaution. Since the bottom of vessel or offshore facility is submersed in the water, the risk of having condensate on the steel surface is getting higher because sea water temperature is normally lower than ambient temperature. And if there is any electric equipment or person working in that space, condensation is normally not allowed. The pontoon of semi-submersible drilling rig is such a space which is submersed, with electric and mechanical equipments and person working periodically. To prevent condensation in pontoon, study was conducted by checking several cases.

• Journal of the Korean Society for Marine Environment & Energy
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• v.8 no.2
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• pp.67-73
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• 2005

The characteristics of the floating breakwater is briefly reviewed and their performance is numerically investigated. The numerical scheme is a boundary integral method for inviscid potential flows, and various two-dimensional floating breakwater modules are studied focusing on the transmission coefficient. The general characteristics of pontoons is studied as function of mooring line stiffness, mass moment inertia and draft. Trapezoidal-, hat- and table-shape cross-sections are also studied with varying shape-parameters. The efficiency varies with changes in each shape-parameter and for some cases satisfying tranquility can be expected with even longer waves.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.14 no.3
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• pp.183-191
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• 2002

In general, the salient features of the floating breakwater have excellent regulation of sea-water keeping the marine always clean, up and down free movement with the incoming and outgoing tides, capable of being installed without considering the geological condition of sea-bed at any water depth. This study discusses the three dimensional wave transformation of the floating breakwater moored by piers, and its dynamic response numerically. Numerical method is based on the boundary integral method and eigenfunction expansion method. It is known that pier mooring system has higher absorption of wave energy than the chain mooring system. Pier mooring system permit only vertical motion (heaving motion) of floating breakwater, other motions restricted. It is assumed in the present study that a resistant force as friction between piers and floating pontoon is not applied far the vertical motion of the floating breakwater. According to the numerical results, draft and width of the floating breakwater affect on the wave transformations greatly, and incident wave of long period is well transmitted to the rear of the floating breakwater, And the vertical motion come to be large for the short wave period.