• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
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• pp.89-93
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• 2006

This paper is primarily focused on the safe navigation between overtaking and overtaken vessels in restricted waterways under the external forces, such as wind and current. The maneuvering simulation between two ships was conducted to find an appropriate safe speed and distance, which is required to avoid collision. From the viewpoint of marine safety, a greater transverse distance between two ships is more needed for the smaller vessel. Regardless of external forces, the smaller vessel will get a greater effect of hydrodynamic forces than the bigger one. In the case of close navigation between ships under the forces of wind and current, the vessel moving at a lower speed is potentially hazardous because the rudder force of the lower speed vessel is not sufficient for steady-state course-keeping, compared to that of the higher speed vessel.

• 한국재난정보학회 논문집
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• 제8권2호
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• pp.138-147
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• 2012

본 논문에서는 해상풍력발전타워와 선박충돌에 대한 다양한 매개변수에 해석을 수행하여 선박충돌시 버켓파일로 지지된 기초부와 상부타워의 극한하중에 대한 거동을 분석하였다. 또한 충돌에너지의 변화에 따른 버켓기초의 안정성 여부 및 풍력타워의 에너지 소산능력에 대해 파악하였다. 해석결과 선박이 충돌에너지는 주로 타워의 소성변형에너지에 의해 소산 되었으며 이러한 극한상태의 하중에도 기초부는 충분한 지지력을 보이는 것으로 나타났다.

• 수산해양기술연구
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• 제49권1호
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• pp.40-50
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• 2013

This study is aimed to find a control factor for the marine casualty of fishing vessel by using the risk quantitative method of marine casualty, and sequentially timed event analysis for the reason finding. The result is that collision, sinking, and capsizing took high risk need to be strongly controlled. And the accident reason and control factors distinguished are as follows. The 82.2% of collided fishing vessels have negligence of look out as a immediate cause, while it was judged that underlying causes were the characteristics of vessels and fishing method, lack of suitable complement, fatigue, the prejudice or ignorance on steering and sailing rules. So the control factors are; firstly needs educational control measures and in terms of systemic control approach expand the range of the certificate of competency more smaller tonnage.

• Ocean Systems Engineering
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• 제5권3호
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• pp.181-198
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• 2015

An OSV (Offshore Support Vessel) is being used to install a structure which is laid on its deck or an adjacent transport barge by lifting off the structure with its own crane, lifting in the air, crossing splash zone, deeply submerging, and lastly landing it. There are some major considerations during these operations. Especially, when lifting off the structure, if operating conditions such as ocean environmental loads and lifting off velocity are not suitable, the collision can be occurred due to the relative motion between the structure and the OSV or the transport barge. To solve this problem, this study performs the physics-based simulation of the lifting off step while the OSV installs the structure. The simulation includes the calculation of dynamic responses of the OSV and the structure, including the collision detection between the transport barge and the structure. To check the applicability of the physics-based simulation, it is applied to a problem of the lifting off step by varying the ocean environmental loads and the lifting off velocity. As a result, it is confirmed that the operability of the lifting off step are affected by the conditions.

• 한국군사과학기술학회지
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• 제15권3호
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• pp.266-271
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• 2012

The rescue methods for the marine casualties are limited due to the characteristics of operation environment of the vessel. Especially the most of marine accidents have been occurred at the bow structure of ship. Moreover the failure of bow structure may lead to catastrophic mishaps. In this paper, the extents of damage of a bow structure fracture subject to collision accident was investigated by using numerical method. The computer simulation approach by using Finite Element Method was employed to accomplish this goal. A finite element model, a 3D model of ship, has been utilized to evaluate damage of bow structure according to collision scenario. In conclusion, we have demonstrated that the plastic deformation occurred at the bow structure. Also it was shown that the collision angle clearly plays a role in determining amount of damage of ship structures.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2004년도 Asia Navigation Conference
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• pp.177-185
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• 2004

This paper describes Listening Decision Aid Simulator (LDAS) to provide a decision-supporting tool that can reproduce real-like listening situations focused on the duty officer's two ears. The sound propagation mechanism from a whistle to listener's two ears is established at first, and the spatial transfer coefficients of a bridge door are measured at training vessel. Then, the construction works with the spatial transfer coefficients and its evaluation experiments with five collision accidents are carried out. As results from tests, the five cases can be judge by LDAS; it led to the insight of practical use of LDAS as one of the decision supporting system in collision accidents.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2010년도 춘계 학술대회 제22권1호
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• pp.165-166
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• 2010

내부공사 및 유지관리 기간 중 발생 가능한 충돌시나리오를 설정하여 갑문 및 교각의 충돌해석 및 손상도를 구조해석 하였다. 또한, 충돌해석은 재료비선형을 고려하여 시간이력해석을 수행하였으며 충돌해석에서 교각에 전달되는 충돌하중을 산정하여 구조해석한 후 손상도를 평가하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
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• pp.347-350
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• 2005

A ship collision analysis by finite element method is performed considering the effects of mass and speed of ship and material and shape of structures to analyze the dynamic characteristics by ship collision. From this analysis, collision load-time history and inelastic deformation of ship and structures are obtained. Dynamic characteristics are different from each other according to interaction. between ship and structures. It seems that there are lots of factor to have effects on the ship-structures interaction. But because little information is available on the behavior of the inelastic deformation of materials and structures during the type of dynamic impacts associated with vessel impact, assumptions based on experience and sound engineering practice should be substituted. Therefore more researches on the interaction between ship and structures are required.

• 해양환경안전학회지
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• 제7권3호
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• pp.41-59
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• 2001

Recently, as the coastal trading is being increased rapidly, risk of collision being increased especially in the coastal route near around the port of Wando. In this paper, with the reference to various literatures and papers on collision avoidance rules, the navigational rules and regulations for the coastal area-especially for the narrow channel-are construed and introduced in brief. Also, 3 collision cases near around the port of Wando and statistical data during 5 years(1996 to 2000) are studied. The results of this study are as follows; 1. It is strongly recommended to separate the route of east-bound and west-bound in this area due to removing the risk of collision between the vessels in reciprocal way. 2. The owner of the fleet should lead that the master should con the vessel by himself when passing this area. 3. For the introduction of the Coastal VTS, it is required to investigate the capability to cooperate with military radar sites which based on all over the coast.

• 수산해양교육연구
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• 제21권1호
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• pp.52-58
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• 2009

항행중에 두 선박이 접근하여 충돌의 위험이 있을 경우 안전한계접근거리 즉 피항을 시작해야할 시점에 대해서 실선시험을 통한 자료에 근거를 하여 조종성지수를 산출하고 안전한계접근거리를 계산하여 제공함으로써 항행중에 선박의 조선자들이 상대선박과 피항동작을 취해야 할 경우에 경험이나 감각에만 의존함으로써 생기는 착오를 방지하고자 하였다. 앞의 논의 과정을 요약하면 다음과 같다. 1. 조우각도가 같을 경우에도 타각을 10도사용하면 타각을 30도 사용할 때보다도 안전한계접근거리는 최소 1.3배에서 최대 1.8배정도 더 증가하므로 해상상태, 자선의 적하상태를 고려해서 대타각의 전타가 어려울 경우 특히 피항개시 시점을 충분히 주의해야한다. 2. 선박의 크기에 상관없이 조우각도가 90도 부근에서 충돌의 위험이 가장 커서 안전한계접근거리는 소형선(300톤급)에서는 자선 길이의 5.0배에서, 대형선(100,000톤급)에서는 10.7배로서 대형선일수록 피항개시 시기를 놓치지 않도록 해야 한다. 3. 조우각도가 적을 경우가 클 경우보다도 안전한계접근거리가 훨씬 크게 나타났고 대형선에서 더욱 두드러지게 나타났다.