• 한국항해항만학회지
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• 제28권10호
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• pp.843-850
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• 2004

본 연구에서는 지역적 문화적으로 특색을 달리하는 크루즈 모델 개발의 한 방안으로서 미래지향적 주거개념의 크루즈선 설계모델을 제시하였다. 크루즈선 설계를 위해서는 조선공학, 건축디자인, 경영경제학 등의 복합지식이 요청되고 있다. 본 연구에서는 선박의 하부구조 결정을 통해 초기 선형을 도출한 후 기본설계에 들어가는 기존의 조선설계 방법과는 반대로 상부구조의 건축디자인 작업이 먼저 착수되는 Top-Down 방식의 접근방법을 채택하였다.

• 한국해양환경ㆍ에너지학회지
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• 제14권1호
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• pp.32-39
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• 2011

최근 들어 선박안전 관련 규정이 개정되거나 운항환경이 변화하면 선주사들은 이에 효과적으로 대응하기 위하여 크루즈선을 포함한 여객선을 새로 건조하는 대신 경제적 부담이 적은 기존 선박에 대한 선체개조 즉 컨버전을 많이 실시하고 있다. 컨버전은 선체의 주요 제원을 포함하여 선박의 구조강도, 유체역학적 성능, 여객수 및 화물 용량 등 많은 부분에 변화를 가져오므로 이의 수행에 앞서 세심한 사전 검토가 필요하다. 그러나 아직까지 여객선의 컨버전과 관련된 연구가 수행되지 않았기에, 본 연구에서는 이러한 컨버전을 직접 수행한 컨설팅사들의 보고서를 중심으로 그 동향을 조사하고 분석하여 그 결과 랭스닝 컨버전이 선박의 주요 제원이나 성능에 가장 큰 변화를 발생시킨다는 사실을 확인하였다. 이와 더불어 랭스닝 컨버전을 염두에 두고 건조할 경우 선체개조로 인해 발생하는 문제점들을 최소화하기 위하여 헐 스캔틀링, 선형, 절단 위치 등과 같은 기본설계 단계에서 미리 고려해야 할 요소들에 대해 제시하였다.

• 대한조선학회논문집
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• 제47권2호
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• pp.150-162
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• 2010

Assessment of hydrodynamic performance of a ship hull has been focused on a model ship rather than a full-scale ship. In order to design the propeller of a ship, model-scale wake is often extended to full-scale based upon an empirical method or designer's experience, since wake measurement data for a full-scale ship is very rare. Recently modern CFD tools made some success in reproducing wake field of a model ship, which implicates that there are some possibilities of the accurate prediction of full-scale wakes. In this paper firstly the evaluation of model-scale wake obtained by Fluent package was performed. It was found that CFD calculation with the Reynolds-stress model (RSM) provided much better agreement with wake measurement in the towing tank than with the realizable k-$\varepsilon$ model (RKE). In the next full-scale wake was calculated using the same package to find out the difference between model and full-scale wakes. Three hull forms of KLNG, KCS, KVLCC2 having measurement data open for the public, were chosen for the comparison of resistance, form factor, and propeller plane wake between model ships and full-scale ships.

• International Journal of Naval Architecture and Ocean Engineering
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• 제4권2호
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• pp.141-150
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• 2012

Ship damage caused by maritime casualties leads to marine pollution and loss of life and property. To prevent serious damage from maritime casualties, several types of safety regulations are applied in ship design. Damage stability regulation is one of the most important safety issues. Designs of ships for long international voyages must comply with these regulations. Current regulations, however, do not consider the characteristics of the operating route of each ship and reflect only ship size and type of cargo. In this paper, a damage safety assessment was undertaken for a ship carrying radioactive waste in actual wave conditions. Damage cases for safety assessment were constructed on the basis of safety regulations and related research results. Hull form, internal arrangement, loading condition and damage condition were modeled for damage safety simulation. The safety simulation was performed and analyzed for 10 damage cases with various wave heights, frequency and angle of attack on an operating route. Based on evaluation results, a design alternative was generated, and it was also simulated. These results confirmed that damage safety analysis is highly important in the design stage in consideration of the operating route characteristics by simulation. Thus a ship designer can improve safety from damage in this manner.

• 대한조선학회논문집
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• 제54권3호
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• pp.267-273
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• 2017

Pressure hulls of submerged structures are generally designed as circular cylinders, spheres or cones with form of axisymmetric shell of revolution to withstand the high external pressure of deep ocean. The compressive buckling (implosion) due to hydrostatic pressure is the main concern of structural design of pressure hull and many design codes are provided for it. It is well-known that the buckling behavior of thin shell of revolution is very sensitive to the initial geometric imperfections introduced during the construction process of cutting and welding. Hence, the theoretical solutions for thin shells with perfect geometry often provide much higher buckling pressures than the measured data in tests or real structures and more precise structural analysis techniques are prerequisite for the safe design of pressure hulls. So this paper dealt with various buckling pressure estimation techniques for unstiffened circular cylinder under hydrostatic pressure conditions. The empirical design equations, eigenvalue analysis technique for critical pressure and collapse behaviors of thin cylindrical shells by the incremental nonlinear FE analysis were applied. Finally all the obtained results were compared with those of the pressure chamber test for the aluminium models. The pros and cons of each techniques were discussed and the most rational approach for the implosion of circular cylinder was recommended.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2002년도 추계공동학술대회논문집
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• pp.7-12
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• 2002

해양레저의 기본적인 장비인 모터보트는 대부분 수입된 모터보트에 의존하고 있는 실정이다. 따라서 해양레저 및 모터보트 수요 확대에 대비하여 저가이면서 안전한 국산 모터보트를 개발하는 것이 요구된다. 그러나 해양레저용 모터보트의 국내 개발은 전무하다. 본 연구에서는 해양레저용 보급형 모처보트의 개발의 전 단계로써 모터보트의 개념 설계에 관하여 고찰하였다. 본 연구에서는 먼저 국내 레저선박 보유 현황 및 수요 예측에 대하여 간단히 고찰한다 또한 해외의 해양레지용 모터보트에 대한 벤치마킹을 수행한다. 그리고 해외 레저용 모터보트의 벤치마킹 결과에 기초한 보급형 모터보트의 요구 성능, 기본 제원의 범위, 필요 설비 등에 대하여 고찰한다. 마지막으로 보급형 모터보트의 선형석계 사례를 제시한다.

• Journal of Advanced Marine Engineering and Technology
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• 제33권6호
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• pp.843-851
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• 2009

Much work has already been done to control and regulate the worldwide problems caused by climate change, particularly the issues on greenhouse gas (GHG) emissions. Carbon dioxide ($CO_2$), having the highest form of concentration among GHGs composed around 1.0 billion tons of emission, and comprises about 98% of the total emissions from the shipping industry. Korean trade mainly rely on the sea transportation. Korean ship tonnages that was brought about by shipbuilders all over the country, continues to grow annually due to the prevailing demands on goods or material supplies and depicting only a small part of the global maritime activity. Nowadays, new build ships coming from the Korean Shipbuilders are being optimized by hull, structure and appendages design, The operational capability of the propulsion and auxiliary machineries in its maximum capacity to achieve the highest possible efficiencies for energy and onboard power use to mitigate $CO_2$ emissions are continually being done through the help of research and development. In this paper, the energy efficiency design index and anboard power capacity of Korean new build ships have been analyzed with response to data collected by ship types, and its respective fuel consumption in relation to $CO_2$ emission results. In response to climate change convention outcome proposals, the best way for the new build ships to become energy efficient is by lowering its operational speed thru adopting the state of the art diesel propulsion engines, patronizing the best sailing practice to lower the transportation cost on the different sea trade routes also helps in $CO_2$ mitigation.

• 해양환경안전학회지
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• 제14권3호
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• pp.227-233
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• 2008

최근 남북한의 경제교류 증대 및 개성공단의 발전에 따라 남북한의 물동량은 급속히 증가하고 있다. 또한 인천과 개성 사이의 물류 수송을 위하여 육상수송뿐만이 아니라 다양한 물류 수송 및 수송로의 제공이 요구되고 있다. 이 논문에서는 인천과 개성 사이의 바지 운송시스템 구축에 대하여 고찰한다. 적은 초기 투자비용, 적하역 및 접안 편이성 등과 같은 유리한 점을 가진 바지 운송시스템은 유럽 및 미국 등에서 널리 사용되고 있다. 먼저 본 논문에서는 바지 운송 항로, 해상 물동량 및 바지와 푸셔로 구성되는 바지 선단 등에 대하여 고찰한다. 그 다음에 바지 해상항로 조건 및 바지 선단 등에 기초하여 바지 및 푸셔의 선형 및 일반배치 설계를 수행한다. 마지막으로 바지 항로 운영 방안, 적하역 시설, 물류 센터 및 복합 수송 등과 같은 바지 해상항로 구축 방안에 대하여 고찰한다.

• 대한조선학회논문집
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• 제47권3호
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• pp.321-327
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• 2010

During sailing by wind-driven thrust on the sail, a catamaran sailing yacht generates leeway and heeling. For estimating resistance and moment prediction of a real ship by changing of running attitude, a model test of the ship has to be carried out. This study aims at establishing experimental techniques for a catamaran sailing yacht by changed attitude during running direction. Through the model test, drag and side force of the real ship are predicted. Also through experiment, rolling and yawing moments were considered.

• Asian-Australasian Journal of Animal Sciences
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• 제13권10호
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• pp.1407-1413
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• 2000

Oil palm frond (OPF) is a new non-conventional fibrous feed for ruminants. Evaluation on the nutritive values and digestibility of OPF was carried out using goats. In a completely randomised design, 20 local male goats were assigned to evaluate fresh and different types of processed OPF. A 60 day feeding trial was done to determine the digestible nutrient intake of fresh, ensiled and pelleted OPF and its response on live weight gain of goat. The pelleting of OPF increased (p<0.05) intake compared to fresh or ensiled OPF. The OPF based mixed pellet (50% OPF with 15% palm kernel cake, 6% rice bran, 6% soybean hull, 15% molasses, 2% fishmeal, 4% urea, 1.5% mineral mixture and 0.5% common salt) increased (p<0.05) nutrient intake, digestibility and reduced feed refusals. The mixed pellet also increased digestible dry matter intake (DDMI) and digestible organic matter intake (DOMI) at 80% and 63% level respectively than the fresh OPF. The increased digestible nutrient intake on the OPF based mixed pellet, resulted in increased live weight gain of goats. Furthermore, OPF has a good potential as a roughage source when it is used with concentrate supplement. OPF based formulated feed in a pelleted form could be used as a complete feed for intensive production of goat and other ruminants.