• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.06a
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• pp.591-593
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• 2012

매년 우리나라 태풍 내습 시에는 진해만으로 피항 선박이 폭주하여 피항선박들의 피항지에서의 해양사고 사고 발생 가능성이 매우 높은 실정이다. 본 연구에서는 진해만의 태풍 피항지로서의 특성과 피항선박들의 실태에 대해서 조사 분석하였다. 또한 피항지에서 체류하는 동안 발생한 해양사고 유형을 분석하여 유사사고를 예방하기 위한 대책을 검토하였다. 특히 VTS의 관제를 통한 해양사고경감 방안을 제시함과 동시에 피항선박들 및 선사 및 관련 기관들의 적극적인 협력이 절대적으로 요청되고 있음을 밝혔다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.25 no.2
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• pp.169-177
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• 2019

It is very important to understand the intention of a target ship to prevent collisions in multiple-ship situations. However, considering the intentions of a large number of ships at the same time is a great burden for the officer who must establish a collision avoidance plan. With a distributed algorithm, a ship can exchange information with a large number of target ships and search for a safe course. In this paper, I have applied a Distributed Stochastic Search Algorithm (DSSA), a distributed algorithm, for ship collision avoidance. A ship chooses the course that offers the greatest cost reduction or keeps its current course according to probability and constraints. DSSA is divided into five types according to the probability and constraints mentioned. In this paper, the five types of DSSA are applied for ship collision avoidance, and the effects on ship collision avoidance are analyzed. In addition, I have investigated which DSSA type is most suitable for collision avoidance. The experimental results show that the DSSA-A and B schemes offered effective ship collision avoidance. This algorithm is expected to be applicable for ship collision avoidance in a distributed system.

• Journal of the Korean Society of Marine Environment & Safety
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• v.16 no.1
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• pp.101-106
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• 2010

Marine transportation system plays an important role in maintaining and promoting economic activities among countries. The accurate understanding of marine traffic flows are necessary for the further advancement of marine transportation system. While many existing researches on marine traffic have been conducted mainly on the basis of statistical analysis using traffic data, ship's traffic flow simulation model was developed in this study. A collision avoidance algorithm was conducted with categorizing of traffic factors such as ship's length and speed. The developed model was also verified by a simulation process.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2009.10a
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• pp.119-120
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• 2009

It has been reported that most accidents are caused by human factors. and especially collisions occurred by human are more than 80 percent. Thus we have to understand how mariners generally deal the own operating ship to avoid the target ship. what information they require. and so on. The aim of this paper is to clarify the important factors influencing mariners' decision-making in the situation of collision avoidance. As a result, main factors in each process for collision avoidance were analyzed.

• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.149-149
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• 2017

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.11a
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• pp.174-175
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• 2022

첨단 항해장비가 대부분의 선박에 보급된 바 있으나, 선박충돌사고는 줄어들지 않고 있으며, 전체사고의 10-20% 정도가 충돌사고이며, 이중 90% 이상이 운항과실로 인하여 발생하고 있다. 과거 허베이스피리트호 사고에서 보듯이 선박충돌사고는 대형 오염사고로 확대될 우려가 있으므로, 대책수립 등을 위한 원인분석 기술이 매우 중요하다. 한편, 소형선 사고가 전체 사고의 60% 이상을 차지할 정도로 중요하며, 어선 등 소형선 사고의 경우, AIS나 V-PASS가 미장착 되었거나 고장 등으로 인하여 운항데이터가 없는 경우, 그 원인을 파악하는데 문제가 될 수 있다. 이를 해결하기 위하여, 사고 선박 내 운항데이터가 없는 경우, VTS 레이더를 이용하여 사고를 분석할 수 있는 레이더 기반 선박충돌사고재현시스템 및 원인분석 기술을 개발하였다. 이를 검증하기 위하여, 실제 사고사례에 대하여 VTS 레이더 데이터를 수집하였고, 본 레이더 기반 선박충돌사고 재현시스템을 이용하여 사고재현 및 회피 시뮬레이션을 수행하였다. 특히, 사고 재현시 운항과실 확인을 위한 선박충돌위험도 평가와 함께 사고당시 회피가 가능했는지 여부를 확인하기 위한 피항 가능성 평가를 병행하여 수행하였다. 본 논문에서는 레이더 기반 선박충돌사고 재현시스템의 특징과 실제 사고사례에 대한 레이더 기반 선박충돌 사고재현 및 피항가능성 평가 결과에 대해 소개한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2004.11a
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• pp.57-60
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• 2004

Evaluating the risk of collision quantitatively plays a key role in developing the expert system of navigation and collision avoidance. This study analysed thoroughly how to determine the thresholds as described in the new evaluation of collision risk using sech function, and developed the appropriate equation as applicable.

• Journal of the Korean Society of Marine Environment & Safety
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• v.19 no.1
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• pp.17-22
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• 2013

If we were in a head-on or crossing situation with a target ship and did not know the target ship's intention to change her course, we might be confused about our decision making to change our course for collision avoidance and be in a danger of collision. In order to solve these problems, we need to develop an automatic system which enables mariners to easily detect a change in the target ship's course and efficiently avoid being on a collision course. In this paper, we proposed an early detection method on altering course of a target ship using the steering wheel signal. This method will contribute to the reduction of collision accidents and also be used to the VTS system and the analysis of marine accidents.

• Journal of the Korean Institute of Intelligent Systems
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• v.21 no.3
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• pp.290-295
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• 2011

On the basis of DCPA(Distance to Closest Point of Approach) and TCPA(Time to CPA), the conventional algorithms for collision avoidances have a drawback that the '72 CORLEGs(International Regulations for Preventing Collisions at Sea, 1972) has not taken into account to prevent collisions between ships. In this paper, the proposed algorithm decides whether the own ship is a give-way vessel or a stand-on vessel by observing the relative bearing of the encountered ship. To determine the ship position and time for collision avoidance, the proposed algorithm utilizes the ellipse model for ship safety domain. The computer simulation is done to represent the process of adversive behavior. Using the proposed method, the past maritime accident is analyzed. The proposed method can be effectively applied to collision avoidance by CORLEGs even when the target ship's navigational lights is invisible in poor weather and/or in the restricted visibility.

• Journal of Navigation and Port Research
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• v.47 no.6
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• pp.401-409
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• 2023

This study compared and analyzed the performance of a distributed area search algorithm and a distributed probability search algorithm based on information exchange between ships. The distributed algorithm is a method that can search for an optimal avoidance route based on information exchange between ships. In the distributed area search algorithm, only a ship with the maximum cost reduction among neighboring ships has priority, so the next expected location can be changed. The distributed stochastic search algorithm allows a non-optimal value to be searched with a certain probability so that a new value can be searched. A circular-based ship collision avoidance model was used for the ship-to-ship collision avoidance experiment. The experimental method simulated the distributed area search algorithm and the distributed stochastic search algorithm while increasing the number of ships from 2 to 50 that were the same distance from the center of the circle. The calculation time required for each algorithm, sailing distance, and number of message exchanges were compared and analyzed. As a result of the experiment, the DSSA(Distributed Stochastic Search Algorithm) recorded a 25%calculation time, 88% navigation distance, and 84% of number of message exchange rate compared to DLSA.