• Journal of the Korean Society of Marine Environment & Safety
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• v.20 no.5
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• pp.579-585
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• 2014

For the application of fuel cell systems on ship which is future eco-friendly ship technology, it is need that the modification of relevant laws and regulations with relevant technical development. This paper reviews the trend of fuel cell development, SOLAS and IACS UR/UI as a international regulations, international standardization trend such as IMO MEPC, IMO BLG and major classification rules, the consideration for the standard development of ship fuel cell systems, the implications for application of fuel cell systems on ships in Korea. The IGF Code which is developing in the IMO included fuel cell, and thus Korean government and related company should participate in the codification. The analysis of development of IMO's relevant regulations also needed for the preparations.

• Journal of the Korean Society of Marine Environment & Safety
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• v.23 no.6
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• pp.731-738
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• 2017

Twin-hulls frequently incur structural damage at connecting members between the hull and deck induced by pitching motions during voyages. so, reasonable reinforcement is necessary around vulnerable spots such as corner knuckle, the chine bottom and inner hull. Since guidelines for structural design are not clear, engineers often respond by reinforcing plate thickness, changing stiffener sizes and reducing frame spacing, etc. These members constitute about 85 % of the longitudinal dimensions of the ship, so it is necessary to locally reinforce certain points to minimize weight stress, and also solve construction cost problems while securing the freeboard margin. Therefore, we developed a new program by analyzing the structural design procedures for the twin car-ferries based on Korean Register of Shipping (KR) High Speed Craft Rules, identifying items that need to be added. In order to ensure the reliability of buckling estimations for procedures and design programs, we conducted a comparative study with other standards and confirmed that differences were minimal.

• Journal of the Society of Naval Architects of Korea
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• v.31 no.4
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• pp.130-138
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• 1994

Bottom plates of empty hold are subjected to not only water pressure but also bi-axial inplane loads, specially in the alternate full loading full loading condition of bulk carrier. This kind of plate behaviours is very difficult to be explained and to be estimated using common buckling design guide in the initial design stage of hull structure, therefore, some more concrete studies for this plate structure was performed based on the currently developed buckling estimation formula. In this buckling formula, torsional stiffness effects of edge stiffener are included additionally and effects of elastic buckling strength of plate panel are treated as characteristic value problem. Also considering boundary stiffener effects and inplane and lateral loading, evaluation of bottom plate scantling using this formula, calculated results using various classification regulation of buckling strength and results of first report approach are compared each other and useful guides using developed formula for bottom plate scantling design are discussed.

• Journal of Ocean Engineering and Technology
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• v.33 no.1
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• pp.33-41
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• 2019

Estimating fatigue damage is a very important issue in the design of ships. The springing and whipping response, which is the hydro-elastic response of the ship, can increase the fatigue damage of the ship. So, these phenomena should be considered in the design stage. However, the current studies on the the application of springing and whipping responses at the design stage are not sufficient. So, in this study, a prediction method was developed using fluid-structural interaction analysis to assess of the fatigue damage induced by springing and whipping. The stress transfer function (Stress RAO) was obtained by using the 3D FE model in the frequency domain, and the fatigue damage, including linear springing, was estimated by using the wide band damage model. We also used the 1D beam model to develop a method to estimate the fatigue damage, including nonlinear springing and whipping by the vertical bending moment in the short-term sea state. This method can be applied to structural members where fatigue strength is weak to vertical bending moments, such as longitudinal stiffeners. The methodology we developed was applied to 325K VLOC, and we analyzed the effect of the springing and whipping phenomena on the existing design.

• Journal of Welding and Joining
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• v.33 no.5
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• pp.20-25
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• 2015

Clad steel has good corrosion resistance and mechanical properties arising from the hot rolling of dissimilar metals, such as carbon steel and stainless steel. However both good corrosion resistance from the cladding plate material(stainless steel) and mechanical properties from the base plate material (carbon steel) are difficult to obtain because the different steels display opposite behaviors during the cladding process. In order to make clad steel for application in the hulls of ships, proper materials selection and heat-treatment conditions are necessary. In this study, mechanical properties of base plate materials with different chemical composition were evaluated according to heat condition of cladding plate material.

• Journal of Ocean Engineering and Technology
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• v.1 no.1
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• pp.73-83
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• 1987

한국형 해저원유 초기생산 시스템은 제주도 남쪽의 한.일 공동개발구역 및 이와 유사한 조건의 지역에서 소규모 유전이 발견되었을때, 빠른 시간내에 저렴한 초기투자비로 석유를 생산할 수 있도록 개발되었다. 이 시스템은 원유저장용 선박, tower, yoke, gravity base 및 원유처리장치들로 구성되어 있으며 각 구조믈들은 pin 또는 universal joint들로 연결되어있다. 본 구조물의 파도중에서의 동적거동은 전산 program을 이용하여 구하여 wave tank에서 수행된 실험의 결과와 비교, 검토하였다. 그리고 이들 결과를 이용하여 구조적 안전성을 검토하였으며, 설계, 해석 및 model test의 결과들은 선급협회의 승인을 받았다.

• Journal of Ocean Engineering and Technology
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• v.1 no.1
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• pp.120-126
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• 1987

In this paper, the optimizing investigation of characteristics of underwater welding by a gravity type arc welding process is experimentally carried out by using the .phi. 4mm ilmenite type of domestic coated welding electrodes for welding the domestic marine structural steel plates of 8mm thickness in order to develop the underwater welding techniques in practical use, resulting in the quantitative analysis possibility for the relationship between the mechanical propernical properties of underwater welded joint HAZ and the welding heat input.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2007.12a
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• pp.22-24
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• 2007

최근 소형선박의 선체 재료로써 기존의 FRP선이 갖는 환경문제와 자원의 재활용 및 선체중량경감의 측면에서 소형선박을 중심으로 알루미늄선으로의 전환이 이루어져 왔지만, 알루미늄에 대한 용접 기능공 및 기술이 부족하여 건조 공정에 많은 시간과 비용이 소요되어 중소조선소에선 알루미늄선체 건조에 많은 애로 점을 가지고 있다. 이에, 본 연구를 통해 알루미늄선체의 구조부재 제작시 용접에 의한 공정을 압출성형 기법으로 대체하고 알루미늄선체의 용접에 소요되는 높은 인건비와 시간을 절약하여 원가 절감의 효과를 도모하며 또한 알루미늄선박 일체형 구조부재의 경량화 기법과 한국선급의 알루미늄선체 강도 기준을 적용하여 표준화된 구조부재의 압출성형 기법을 정립하고자 한다.

• Transactions of the KSME C: Technology and Education
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• v.1 no.1
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• pp.27-31
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• 2013

The Flare system is the offshore plant equipment for protecting humans and equipments from high heat radiations of waste gas and oil burning. As Primary equipment of well test systems, the flare system is essential Class(DNV, ABS etc) design certification. Therefore, this paper is introduced to be related to computational analysis of flare system design certification procedure.

• 월간 기계설비
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• s.295
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• pp.69-78
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• 2015

공정거래위원회가 지난 해 12월 31일 건설업종 표준하도급계약서 개정을 공포하고 시행에 들어갔다. 개정된 건설업종 표준하도급계약서는 ${triangle}$부당특약 무효 ${triangle}$하도급대금지급보증제도 강화 ${triangle}$계약변경 시 하도급자의 권리 보호 강화 ${triangle}$선급금 사용제한 금지 등의 조항을 신설하고 ${triangle}$하도급자의 공사 중지 요청 권한과 계약해제 해지 요건 등의 확대 ${triangle}$하도급대금 지급 규정과 대물변제 금지 규정 등의 조항을 명확히 했다. 이러한 개정은 대한설비건설협회가 불공정 하도급 거래관행 개선과 회원사의 권익을 보호하기 위해 공정거래위원회에 건설공사 하도급계약에 사용되는 표준하도급계약서 개선을 지속적으로 건의한 결과 우리협회의 의견이 반영된 것이다.