• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.69-70
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• 2016

선박과 유빙의 충돌로 발생하는 빙하중은 선체의 구조강도 문제뿐만 아니라 선박의 속력감소 및 조종운동에도 영향을 미친다. 이 연구에서는 DEM (Discrete Element Method) 기법을 이용하여 유빙을 항해하는 선박의 조종성능 평가를 위한 수치 시뮬레이션 프로그램을 개발한다. 여러가지 유빙 조건에서 선회성 시험 및 10/10 지그재그 시험을 시뮬레이션하여, 유빙의 상태가 선박의 조종성능에 미치는 영향을 파악한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2003.05a
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• pp.81-86
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• 2003

The studies on automatic ship collision avoidance system, which have been carried out last 10 years, are facing on new situation due to newly developed high technology such as computer and other information system. It was almost impossible to make it used in real navigation 3-4 years ago because of the absence of the tool to get other ship's information, however recently developed technology suggests new possibility. This study is carried out to develop the algorithm of automatic ship collision support system. The NOMOTO ship's mathematic model is adopted in simulation for its simplicity. The fuzzy reason rules are used for course-keeping system and for the calculation of Collision Risk using TCPA/DCPA. Moreover‘encounter type’ between two ships is analyzed based on Regulations for Preventing Collisions at Sea and collision avoidance action is suggested, Some situations are simulated to verity the developed algorithm and appropriate avoidance action is shown in the simulation.

• Journal of Navigation and Port Research
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• v.27 no.4
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• pp.375-381
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• 2003

The studies on automatic ship collision avoidance system, which have been carried out last 10 years, are facing on new situation due to newly developed high technology such as computer and other information system. It was almost impossible to make it used in real navigation 3-4 years ago because of the absence of the tool to get other ship's information, however recently developed technology suggests new possibility. This study is carried out to develop the algorithm of automatic ship collision support system. The NOMOTO ship's mathematic model is adopted in simulation for its simplicity. The fuzzy reason rules are used for course-keeping system and for the calculation of Collision Risk using TCPA/DCPA. Moreover ‘encounter type’ between two ships is analyzed based on Regulations for Preventing Collisions at Sea and collision avoidance action is suggested. Some situations are simulated to verity the developed algorithm and appropriate avoidance action is shown in the simulation.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.06a
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• pp.132-134
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• 2012

우리 나라에서 해상 교통 및 선박의 통항 안전성의 평가를 위하여, 선박조종시뮬레이터 실험을 통해 얻어진 선박운동의 데이터와 조종자의 의견을 반영하여 검토하고 있는 것이 일반적인 수행 방법이다. 세부적인 기법으로는 선박의 해상시설물에 대한 접근도, 선체의 제어도 그리고 선박 조종자의 평가를 들 수 있다. 이 중에서 해양시설물에 대한 선박의 접근 및 선박의 제어도와 관련된 부분은 통계적으로 계산되어 그 기준이 명확한 측면이 있으나, 조종자의 의견에 의한 평가는 상대적으로 기준이 모호한 면이 있고 또한 조종자의 평가와 선박의 제어도와 관계에 대한 연구도 부족한 실정이다. 따라서 본 연구에서는 선박의 제어도와 조종자의 평가를 각각 기술적 운항만족도와 심리적 운항만족도로 정의하고, 그 관계를 알아 보기 위하여 퍼지 추론을 실시하였다. 이로부터 기술적 운항만족도와 심리적 운항만족도의 상관 관계를 정리하고, 그 관계가 높을수록 관련 평가의 신뢰성은 높을 것으로 생각하였다.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 1992.08a
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• pp.135-139
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• 1992

세계 교역량이 증대되면서 해상 교통량은 계속 증가하고 있으며, 후발공업국에서는 새로운 항만의 건조가 활발하게 이루어지고 있다. 우리나라의 경우에도 연안공업단지의 개발과 서해안 개발의 일관으로 기존 항만의 확충은 물론 신항만 건설이 추진되고 있다. 그러나 항만내 계류된 선박의 운동특성을 밝히는 이론이 아직 정립되어 있지 못하여 이에 대한 연구가 절실히 요구되고 있는 실정이다.(중략)

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.10a
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• pp.74-76
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• 2012

칼만이론 및 Unscented 변환 기반의 Unscented 칼만필터를 이용하여 동적위치제어시스템을 설계하였다. Unscented 칼만필터는 기존의 칼만필터처럼 비선형운동방정식을 선형화 할 필요없이 비선형운동방정식 그대로 사용할수 있다. Unscented 칼만필터를 이용하여 설계한 동적위치제어시스템을 MATLAB SIMULINK프로그램을 이용하여 해양선박에 대해 컴퓨터시뮬레이션을 진행하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.12-13
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• 2018

For navigation safety, navigators have to be familiar with maneuverabilities. When a vessel encounters a danger of collisions and stranding, maneuverability is essential for the safety of ship. It is composed of turning, course change, speed change, etc. In the latter part, maneuverabilities and motion of Training Ship HANBADA are provided by full-scale measurement in the $10^{\circ}/10^{\circ}$ Zig-Zag Test, $20^{\circ}/20^{\circ}$ Zig-Zag Test and Turning Circle Test(Port and Starboard). It aims to provide information on maneuverabilities and motion of Training Ship HANBADA so that the navigators can take proper action to avoid.

• Journal of the Korean Society of Marine Environment & Safety
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• v.26 no.7
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• pp.904-914
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• 2020

Through the Ministry of Trade, Industry, and Energy, South Korea is trying to support the "Building Project for Liquified Natural Gas (LNG) Bunkering Ship," centered on the Korea Gas Corporation, while the Ministry of Maritime Af airs and Fisheries is pushing to construct an LNG bunkering terminal at Busan New Port. LNG bunkering ships are essential for supplying LNG fuel from the terminal to the ships, resulting in the need for safety operation procedures. Therefore, in this study, the stability of a coastal LNG bunkering ship operating from Busan New Port to the anchorage in Busan Port was assessed to investigate the need for operational procedures for coastal LNG bunkering ships. Seakeeping analysis of the LNG bunkering ship was performed for each significant wave height by combining the response amplitude operator from the ship motion analysis under the potential flow theory with the actual observed sea data for five years and Texel, Marsen, and Arsloe (TMA) spectrum suitable for the Busan coast. The results showed that the roll and horizontal acceleration were the main risks that affected the navigation seakeeping performance above a significance wave height of 2 m. The operational periods of the LNG bunkering ship ranged from 83.3% to 99.9% of the total observation period.

• Journal of Navigation and Port Research
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• v.30 no.5 s.111
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• pp.315-320
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• 2006

It is well known that the ship manoeuvring motion is greatly affected by hydrodynamic forces and moments acting between two vessels passing too close to each other in confined waters, such as in a harbour or narrow channel. This interaction between two vessels could be assumed to be the functions of the longitudinal distance, transverse distance and their speeds. The aim of this study is to calculate the interaction between two vessels passing close to each other on parallel courses by simulation, and to estimate the effect of rudder action and time at collision through simulation under the condition of various longitudinal distances and different speed-ratios of the two vessels.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2006.06b
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• pp.55-60
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• 2006

It is well known tint the ship manoeuvring motion is greatly affected by hydrodynamic forces and moments acting between two vessels passing too close to each other in confined waters, such as in a harbour or narrow channel. This interaction between two vessels could be assumed to be the functions of the longitudinal distance, transverse distance and their speeds. The aim of this study is to calculate the interaction between two vessels passing close to each other on parallel courses by simulation, and to estimate the effect of rudder action and time of collision through simulation under the condition of various longitudinal distances and different speed-ratios of the two vessels.