• Journal of Navigation and Port Research
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• v.42 no.6
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• pp.388-394
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• 2018

When a ship is berthing on the pier using a mooring rope, excessive ship speeds may cause accidents where mooring rope is cut off. In order to prevent the mooring rope from breaking, there is need to know the approach speed limit of the ship. The purpose of this study is to estimate the berthing speed limit of a ship to prevent mooring fracture. Focus will be made to when the speed of the ship is unknown. In this study, we propose a method and procedure for estimating the berthing-speed limit based on the theory of ship resistance and the elasticity of the mooring rope. This method was found to be effective as it was observed that the mooring rope cannot be broken when it is estimated that the berthing-speed of a 135K LNG vessel, IWRC, and $6{\times}36$ steel wire mooring rope. The method proposed in this study will significantly contribute to preventing actual accidents related to mooring lines.

• Journal of Navigation and Port Research
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• v.32 no.8
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• pp.589-596
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• 2008

In this paper, Artificial Neural Network(ANN) is applied to automatic berthing control for a ship. ANN is suitable for a maneuvering such as ship's berthing, because it can describe non-linearity of the system. Multi-layer perceptron which has more than one hidden layer between input layer and output layer is applied to ANN. Using a back-propagation algorithm with teaching data, we trained ANN to get a minimal error between output value and desired one. For the automatic berthing control of a containership, we introduced low speed maneuvering mathematical models. The berthing control with the structure of 8 input layer units in ANN is compared to 6 input layer units. From the simulation results, the berthing conditions are satisfied, even though the berthing paths are different.

• Journal of Navigation and Port Research
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• v.44 no.6
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• pp.494-500
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• 2020

Maneuvering vessels in the harbor is an interesting problem in marine cybernetics. The vessel, operated by the pilot and moving very slowly in shallow water, usually is assisted by thrusters, the main propulsion system, and tugboats. In this paper, we suggest a new vessel berthing technique using dampers (cylinder-type fenders) and a system of winches for complex and dangerous berthing situations. We found that control of the fender stroke and rope tension enabled a safe and quick berthing process. The effectiveness and usefulness of this berthing system was verified using a ship of about 2,000 tons.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.10a
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• pp.100-102
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• 2010

설계시와 다른 규모가 큰 선박이 접안을 할 경우라도 접안속도 및 적재화물 중량을 조절한다면 현재의 접안구조물 안전 및 전면수심에 문제는 없는 것으로 검토됨.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.10a
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• pp.89-90
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• 2010

광양항 제품부두를 필요한 대부분의 부두의 접안 기준은 재화중량톤을 기준으로 하고 있음. 부분 적재 등이 있을 때 재화중량톤기준으로 하면 선석 운영상 체선 및 비용이 발생이 생기므로 배수톤수를 기준으로 할 필요가 있다. 우리나라의 경우 울산항에서 접안기준 개선이 있었고 외국의 경우에도 배수톤수를 기준으로 하고 있으므로 이를 광양항제품부두에 적극 적용할 필요가 있다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2015.07a
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• pp.63-64
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• 2015

안전운항 관점에서 보았을 때, 평택당진항에 입출항하는 거대형선(Vale Max급)의 접안조종운동에 대해서 이론적으로 검토하고 소요예선마력 및 조석류의 강도와 접안 한계를 파악하는 것이 이 연구의 주된 목적이다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.26 no.2
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• pp.139-148
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• 2020

The most important factor affecting the berthing energy generated when a ship berths is the berthing velocity. Thus, an accident may occur if the berthing velocity is extremely high. Several ship features influence the determination of the berthing velocity. However, previous studies have mostly focused on the size of the vessel. Therefore, the aim of this study is to analyze various features that influence berthing velocity and determine their respective importance. The data used in the analysis was based on the berthing velocity of a ship on a jetty in Korea. Using the collected data, machine learning classification algorithms were compared and analyzed, such as decision tree, random forest, logistic regression, and perceptron. As an algorithm evaluation method, indexes according to the confusion matrix were used. Consequently, perceptron demonstrated the best performance, and the feature importance was in the following order: DWT, jetty number, and state. Hence, when berthing a ship, the berthing velocity should be determined in consideration of various features, such as the size of the ship, position of the jetty, and loading condition of the cargo.

• Journal of the Korean Society of Marine Environment & Safety
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• v.29 no.7
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• pp.857-862
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• 2023

In order for an autonomous ship to arrive near the pier and automatically berth without the help of a tugboat or pilot, it is necessary to recognize the pier and calculate the thruster output and output angle for berthing to the pier at a fixed berthing speed under given external force conditions. Therefore, in this study, the external force and moment acting on the ship while berthing were analyzed, and the thruster output calculation for automatic berthing was designed and the basic concept for the development of the automatic berthing program was designed. The wind pressure applied to the hull by the wind while the ship is berthing was calculated based on the wind pressure area and the wind direction angle and the turning moment to rotate the ship according to the transverse force of the ship was calculated. Considering the force acting on the ship and the turning moment during berthing, a theoretical formula was presented to calculate the thruster output and output angle for berthing parallel to the pier, and the turning due to other variables was controlled by the PID controller. In addition, the basic concept for program development was presented by analyzing the input elements necessary for the theoretical formula.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.9B
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• pp.1314-1321
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• 2010

This system configures a position Sensor as installing on the ship and a guidance system docking of ship what distinguish of the ship about the use and size. The maintain system is received the result of distinction via UWB reader. This system send a information of ship of docking position to user. Thus it suggests the safety to prevent from crash among ships and saves energy and stop waste. The proposed system periodically updates the information of docking position of the ship and monitors in real-time according to the user's request from personal mobile devices. In this paper, we implement of a guidance system Testbed for docking of the ship using position UWB sensor. And user is provided convenience to find easily user's ship in docking area through user interface with Java. Addedly it is possible to prevent ship theft.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.1364-1367
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• 2021

불량 방충재 납입 사건에 따른 방충재 관리의 중요성 및 선박 접안사고가 화두가 되면서 본 논문에서는 현재 방충재 점검 시스템과 그로 인해 발생하는 선박의 접안사고 위험에 대해 문제를 제기한다. 문제를 해결하기 위해 본 논문은 "스마트 방충재 로봇"을 제안하며, 제안하는 로봇의 기능은 다음과 같다. 첫째, 부두에 부착된 방충재의 상태를 실시간으로 확인하고, 전용 애플리케이션을 통해 방충재를 관리한다. 둘째, 방충재 교체 시 부두 위치에 따른 해상조건을 수집하여 적합한 방충재를 추천한다. 셋째, 방충재 손상 또는 선박이 제한 접안속도 초과 시 스마트 방충재 로봇을 투입하여 선박의 접안사고를 방지한다.