• Journal of Navigation and Port Research
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• v.35 no.8
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• pp.631-636
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• 2011

Stable power supply to a light mounted on a navigational buoy is indispensable factor because unstable power can lead to fatal marine accident. Despite the difference lies between onshore and offshore environment, as well as the power output characteristics, the PV(Photovoltaic) power generation system is designed by the independent onshore power generation system standards. Furthermore, the capacity of PV power generation system does not take into account the structural characteristics of the buoy in the sea. Therefore, the faulty design makes battery over-discharge owing to lack of the power generation and the battery can not supply stable power to the light. This paper introduces a design method for a power system of the PV powered buoy. The data has been acquired for 3 months period, which includes PV-generated electricity, power consumption and battery voltage from experimental buoy. Further, a power management features of the buoy has been analyzed based on the acquired data. From the analysis of the acquired data, it was evident that PV power generation system produces different electric power output depend on its installed environment - land and sea. Based on the analytical result, a design criterion has been proposed for the power system in the navigational buoy.

• Journal of Navigation and Port Research
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• v.47 no.4
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• pp.231-238
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• 2023

The position of a light buoy is always flexible due to the influence of external forces such as tides and wind. The position can be checked through AIS (Automatic Identification System) or RTU (Remote Terminal Unit) for AtoN. As a result of analyzing the position data for the last five years (2017-2021) of a light buoy, the average position error was 15.4%. It is necessary to detect position error data and obtain refined position data to prevent navigation safety accidents and management. This study aimed to detect position error data and obtain refined position data by DBSCAN Clustering position data obtained through AIS or RTU for AtoN. For this purpose, 21 position data of Gunsan Port No. 1 light buoy where RTU was installed among western waters with the most position errors were DBSCAN clustered using Python library. The minPts required for DBSCAN Clustering applied the value commonly used for two-dimensional data. Epsilon was calculated and its value was applied using the k-NN (nearest neighbor) algorithm. As a result of DBSCAN Clustering, position error data that did not satisfy minPts and epsilon were detected and refined position data were acquired. This study can be used as asic data for obtaining reliable position data of a light buoy installed with AIS or RTU for AtoN. It is expected to be of great help in preventing navigation safety accidents.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.20-21
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• 2016

Aids to Navigation (AtoN) is marine traffic safety facility to facilitate the safe and efficient movement of shipping and enhance the protection of the marine environment by the regulation or guideline of The International Association of Marine Aids to Navigation and Lighthouse Authorities (IALA). By IALA NAVGUIDE, the term "New Danger" is defined as newly discovered hazards not yet shown in nautical documents and includes naturally occurring obstructions such as sandbanks or rocks or man-made dangers such as wrecks. 'New Dangers' should be appropriately marked using Lateral, Cardinal, Isolated Danger marks or by using the Emergency Wreck Marking Buoy. However, the Emergency Wreck Marking Buoy has difficulties with implementation conditions in terms of speed and accuracy to install the buoy. In case of sinking accidents, it is difficult immediately to install the Emergency Wreck Marking Buoy because of weather conditions, marine environments and accident position. This paper studies Auto Releasing New Danger Mark Buoy on the deck which can be automatically to release from the deck of a vessel and float in the water and quickly install the accident position in case of sinking accidents. The buoy will be to reduce the risk of navigation and prevent secondary collisions.

• Journal of Navigation and Port Research
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• v.43 no.6
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• pp.437-443
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• 2019

Aid to navigation is a navigational aid facility that informs a sailing vessel of its location and direction as well as a location of a specific obstacle by means of a light, shape, color, sound, radio wave, etc. It can be valuable in improving the safety of day and night vessel navigation at sea. For the safety of the tug boat, the minimum equipment requirements for each type of tug boat are arranged. Despite these preparations, the collision accidents between tug boats, barges, and light buoys can occur when the tug boat turns due to the length of the tow-line, tidal current, and the barge's momentum etc. The purpose of this study was to propose the basic system that analyzes the physical relationship between two vessels regarding the tug boat-barge-light buoy dynamics and propagate the corresponding data through the aid to navigation management & operation systems in use at each regional oceans and fisheries.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.136-138
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• 2018

해상에 설치된 등부표에 등화를 밝히기 위해서는 전력 생산장비와 전력 저장장치가 필요로 하는데 등대 및 등부표에 사용하는 등명기는 현재 태양전지와 축전지 및 광원인 등명기를 각기 별도 설치하여 운영하여 등대 관리에 많은 시간과 예산이 소요되는 단점이 있어 국제적으로 전원일체형 등명기를 사용하는 추세이다. 재생에너지를 이용해 안정적인 전원을 공급받으며, 연안 수역을 운항하는 선박이 항로표지를 쉽게 식별할 수 있고, 해양사고 발생 시 긴급 수색 및 구조시스템 외에 침몰선박의 위치를 알려주는 기술을 연구 개발하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2017.11a
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• pp.151-153
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• 2017

해상 특성으로 야간에 항로표지 충돌사고가 빈번하게 발생함에 따라 야간에도 주간처럼 사물 식별이 가능한 영상정보를 확인할 수 있는 고성능 촬영장비 도입하고 부산항 주요항로에 운영되고 있는 항로표지시설의 주 야간 상태 정보를 감시하여 항로표지 고시기능 유지 여부를 확인하고 선박 충돌에 의한 등부표 사고 발생시 가해선박을 색출하여 원인자에게 피해시설을 복구토록 함.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.533-535
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• 2013

압해-암태 1공구에 대한 해상교통안전지단을 실시하여 시공사가 공자를 진행 중이다. 해상교통안전진단을 실시하여 공사 중 안전대책을 제시하였으나 해상교각에 대한 접촉 사고 및 등부표 접촉사고가 빈발하고 있다. 이에 해상교통안전진단의 실시 후 안전 진단의 결과인 안전대책이 제대로 시행되고 있는지, 추후 해상교통안전진단이 필요한지 여부에 대해 고찰하고자 한다. 암해-암태 1공구에 대한 해상교통안전진단보고서의 공사 중 안전대책을 분석하고, 해양사고의 발생 현황 및 원인분석을 통해 안전 진단제도에 대한 개선방안을 제시하고자 한다.

• Journal of Navigation and Port Research
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• v.47 no.3
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• pp.128-133
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• 2023

In order for Aids to Navigation to provide sustainable services to users, it is possible when there is no Aids to Navigation accident. If an Aids to Navigation accident occurs, the manager should efficiently manage it to prevent the same accident. However, the current Aids to Navigation accident management only specifies the cause and type of the accident. There are no separate guidelines. Thus, the accident is recorded differently depending on the manager. Therefore, this study attempted to redefine Aids to Navigation accident. To this end, Aids to Navigation accidents that have occurred over the past 23 years (year 2000 to years 2022), IALA's Aids to Navigation information standard, S-201, and categories of accidents (traffic accidents and marine accidents) were analyzed. Causes of Aids to Navigation accidents were divided into internal and external causes. Accidents were divided into three types: Light tower accident, buoy accident, and equipment accident. By further subdividing primary items, the cause of accident was reestablished into 7 items such as mooring and bad weather and 11 items such as Light tower damage, buoy loss, and equipment breakdown. These research results can be used as basic data to provide future Aids to Navigation accident statistics.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.10a
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• pp.297-300
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• 2014

열악한 해상환경 및 행해자 부주의에 따른 선박 추돌로 인해 항로표지 훼손 사례가 다수 발생하고 있다. 울산지방해양항만청 해사 안전시설과에서는 항로표지 사고원인 파악 및 사고선박 신속 확인을 위해 등부표(스파부이) 2기에 해상용 블랙박스를 설치 운영하고 있다. 그간의 해상용 블랙박스 설치 운영 과정에서 검토되었던 기기선정 문제, 독립전원 문제, 방수기능, 밀폐성, 견고성, 관리 운영 편리성 등에 관하여 논의하고자 한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.185-186
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• 2006

우리나라는 리아스식 해안으로 지형이 복잡하고, 특히 강하구에는 사주의 영향으로 선박의 통항로가 수시로 변화되고 있어, 어선들의 좌초사고가 빈번하게 발생하고 있으나, 수심이 옅고, 굴곡이 많아 등부표 등 항로표지의 설치가 불가능한 실정이므로, 이러한 지형 환경에 맞고, 비용이 저렴한 새로운 항로표지인 등주를 설치하기 위한 연구와 설치 후 효과분석을 기술한다.