• Journal of the Korean Society of Marine Environment & Safety
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• v.13 no.3
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• pp.191-198
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• 2007

Marine accidents are increasing as time goes on, in spite of lots of efforts are given. Marine accidents can be classified 3 categories those are ship's condition, navigator's condition and weather condition. In this paper, statistical analysis were carried using marine accidents data from 1997 to 2006. In order to analyze accident rate by time zone, ship's speed and finding distant, SPSS variance analysis was carried out. Results are followed. There was significant difference between time zone 20${\sim}$04 hours and other time zones. The accident rate in daytime was bigger than that at night. In case of the speed at collision, the speed of 5${\sim}$10 knot has significant difference to other speed cases. In finding distant cases, the case of less than 1 mile has significant difference to other distant cases.

• Journal of the Korean Society of Marine Environment & Safety
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• v.21 no.1
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• pp.57-63
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• 2015

Foreign seafarers have embarked on the fishing vessels as industrial trainees since 1990s and the total number of foreign seafarers on merchant ships and fishing vessels marked 21,327 as of the end of 2013. Especially, in case of deep-sea fishing vessels and coastal/inshore fishing vessels, although the number of fishing vessels decreased, the number of foreign seafarers nearly doubled during recent 5 years. Looking at the marine accidents occurred to fishing vessels, after multinational seafarers are joining on board fishing vessels, difficulties in communication among seafarers has become a major issue. And the safety rules which could be understandable by foreign seafarers are not provided and the education and training for foreign seafarers are not properly conducted either. Consequently, the risk of marine accidents during fishing operation on fishing vessels has increased and emergency response under the captain's control was not effective enough to cope with such emergency situation. Several forced labour issues were also reported resulting from abusive words and assault committed by Korean seafarers. Therefore, This study aims first to review the cases of marine accidents on board fishing vessels which foreign seafarers are working and, the problems concerning employment and education for those foreign seafarers, and then to point out the necessity of conducting training on the safety rules and regular emergency drills for the foreign seafarers in order to prevent marine accidents.

• Journal of the Korean Society of Marine Environment & Safety
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• v.18 no.3
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• pp.213-220
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• 2012

International Maritime Organization made International Convention for the Safety of Life at Sea to require all ships to carry official charts, both paper and electronic, and is especially encouraging the use of Electronic chart display and information system (ECDIS). Recently, the argument that all Electronic Charts(ENC) displayed in ECDIS should be distributed through Regional ENC Coordinating Center is being raised within the IHO. The use of ECDIS was generalized, but the existing two RENCs in Europe are thought to be not enough. Especially, East Asian region, due to its rapid growth in economy and marine traffic, RENC is found necessary. This research establishes the legitimacy and strategy of East Asian RENC by defining the roles of RENC based on the IMO ECDIS Mandatory Carriage Requirement and RENC operation status through suggesting a "Phase-In" RENC model, which was built upon the strategy of East Asian Hydrographic Commission(EAHC).

• Journal of Navigation and Port Research
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• v.35 no.9
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• pp.701-706
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• 2011

Radio waves including GPS signals, various TV communications, and radio broadcasting can be disturbed by a strong solar storm, which may occur due to solar flares and produce an ionospheric delay anomaly in the ionosphere according to the change of total electron content. Electron density irregularities can cause deep signal fading, frequently known as ionospheric scintillation, which can result in the positioning error using GPS signal. This paper proposes a detection algorithm for the ionosphere delay anomaly during a solar storm by using multi-reference stations. Different TEC grid which has irregular electron density was applied above one reference station. Then the ionospheric delay in zenith direction applied different TEC will show comparatively large ionospheric zenith delay due to the electron irregularity. The ionospheric slant delay applied an elevation angle at reference station was analyzed to detect the ionospheric delay anomaly that can result in positioning error. A simulation test was implemented and a proposed detection algorithm using data logged by four reference stations was applied to detect the ionospheric delay anomaly compared to a criterion.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.63 no.12
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• pp.1690-1696
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• 2014

Network RTK generates spatial corrections by using differenced measurements from reference stations in the network, and the corrections are then provided to a rover. The rover, generally, uses linear interpolation, which assumes that the corrections at each reference station are spatially correlated, to obtain a precise correction of its location. However, an irregularity of the tropospheric delay is a real-world factor that violates this assumption. Tropospheric delay is a result of weather conditions, such as humidity, temperature and pressure, and it can cause spatial decorrelation when there are changes in the local climate. In this paper, we have defined the non-linear characteristics of the tropospheric delay between reference stations or user within a region as the "irregularity of tropospheric delay". Such an irregularity can negatively impact the network RTK performance. Therefore, we analyze the influence of the irregularity of tropospheric delay in network RTK based on meteorological data.

• Journal of Navigation and Port Research
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• v.34 no.2
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• pp.145-152
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• 2010

The management of safety at sea is based on a set of internationally accepted regulations and codes, governing or guiding the design and operation of ships. The regulations most directly concerned with human safety and protection of the environment are, in general, agreed internationally through the International Maritime Organization(IMO). IMO has continuously dealt with safety problems and, recognized that the human element is a key factor in both safety and pollution prevention issues(IMO, 2010). This paper proposes a human error analysis methodology which is based on the human error taxonomy and theories (SHELL model, GEMS model and etc.) that were discussed in the IMO guidelines for the investigation of human factors in marine casualties and incidents. In this paper, a cognitive process model, a human error analysis technique and a marine accident causal chains focused on human factors are discussed, and towing vessel collision accidents are analyzed as a case study in order to examine the applicability of the human error analysis technique to marine accidents. Also human errors related to those towing vessel collision accidents and their underlying factors are discussed in detail.

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.121-121
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• 2018

• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.81-81
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• 2017

• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.83-83
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• 2017

• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.55-55
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• 2017