• Proceedings of the Korean Society of Computer Information Conference
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• 2021.01a
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• pp.327-328
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• 2021

본 논문은 2014년 세월호 사고 이후 해양재난사고에 대한 국민들의 경각심이 고조되었으며 해양레저인구증가로 인한 해양사고가 증가되는 상황에서 사고예방 및 해양안전문화 고취를 위한 해양안전교육센터 구축하고자 수요추정을 수행하였다. 특히, 우리나라 대부분의 해양안전체험관과 유사한 체험관들은 대부분 전라, 경기지역에 분포하고 있어 지역 편향을 해소하는 차원에서 동남권 안전센터 구축이 필요한 상황이며 해양레저 및 해양산업의 중심이 영남권에 위치하고 있기 때문에 안전교육센터의 구축의 정책적인 타당성이 있다. 본 논문에서는 해양안전교육센터 수요추정을 중력모형을 활용하여 수행하였으며 사회경제적인 타당성의 근거로서 활용이 가능할 것으로 기대된다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.141-142
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• 2022

열화란 윤활유의 물리적, 화학적 성질이 변하면서 성능이 저하되는 현상을 말합니다. 물리적 변화는 연료유, 수분, 금속 등 이물질 혼입으로 발생되며 화학적 변화는 산화 현상이 대표적이며 슬러지 등을 발생합니다. 해경 경비함정은 장시간 항해, 해상조건등에 따라 엔진의 부하변동이 많습니다. 따라서 윤활유의 역할이 매우 중요합니다. 그러나 연료혼입 등으로 윤활유가 열화되면서 수명이 단축되게 됩니다. 따라서 본 연구에서는 대표적 물리적 변화의 요인인 연료혼입를 실험적으로 고찰하고자 윤활유에 연료를 일정비율로 혼합하여 물성시험 등을 수행하였습니다. 실험결과 동점도는 윤활유에 점도가 낮은 연료유 혼입량이 증가함에 따라 점진적으로 감소하는 경향을 보였습니다.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.55 no.5
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• pp.714-720
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• 2022

A dietary comparison of yellow goosefish Lophius litulon in the South Sea and Yellow Sea was performed by analyzing stomach contents. Using a bottom trawl net from fisheries resources survey vessels of the National Institute of Fisheries Science, 326 individuals were collected from the South Sea and 166 individuals were collected from the Yellow Sea. The total length range of L. litulon was 5.3-68.4 cm for individuals collected from the South Sea and 7.5-55.1 cm for individuals collected from the Yellow Sea. Based on the index of relative importance and the variation in stomach contents by fish size, L. litulon was found to be a piscevore and a spatiotemporally opportunistic feeder fish that fed mainly on pisces. There were differences in the composition of the stomach contents by season, location, and the interaction between the season and the location. Thus, the diet of L. litulon is affected by the prey abundance and prey spectrum of the habitat.

• Korean Journal of Ichthyology
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• v.35 no.4
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• pp.340-346
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• 2023

The diet composition of Engraulis japonicus were studied using 1,087 specimens collected by set net fisheries and boat seine fisheries in the coastal waters of Tongyeong, Korea. The size of the specimens ranged from 1.9 to 14.7 cm in fork length. E. japonicus was fed mainly on Copepods, which constituted 50.4% of IRI, followed by Euphausiids, which constituted 47.3% of IRI. Graphical analysis of the diet composition showed that E. japonicus was specialist predator. The result of analysis in ontogenetic changes significantly exhibited among size classes (<8.0 cm, 8.0~10.0 cm, 10.0~12.0 cm, ≥12.0 cm). The proportion of Euphausiids increased, as body size of E. japonicas increased whereas the consumption of Copepods decreased. In the Spring, Autumn and Winter, the diet was dominated by Copepods. In the Summer, the diet was dominated by Euphausiids.

• Journal of Navigation and Port Research
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• v.36 no.6
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• pp.507-512
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• 2012

Korea is the 5th Maritime Power in the world, especially, Busan Metropolitan City is the 3rd Marine City, which has the largest Container port facility and logistic system in the world. However, Busan Citizen's maritime consciousness does not reach that level. This study points out the problems, which are insufficiency of linkage among maritime education institutes, uniformity of ocean education programs, incomplete ocean education system, inadequate management of ocean education programs and shortage of professional instructors. To solve these problems, it is necessary to develop the ocean education modules, establish the ocean education course and put into formal education course to maximize the education effectiveness. This is for the improvement of the reputation as a Marine City Busan, construction the hydrophil culture and propagation of ocean culture.

• Korean Journal of Ichthyology
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• v.35 no.3
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• pp.177-182
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• 2023

Total 158 Conger myriaster were examined and the range of Preanal length (PaL) was 8.2~40.1 cm and average Preanal length was 17.3 cm. Proportion of the empty stomach was 30.4% and individuals, which the prey items were found in stomach, were 110. The most important prey component in the diets of C. myriaster was Pisces that constituted 54.4% in %IRI (Index of relative importance). Engraulis japonicus was the most important prey component in Pisces. Macrura was the second largest prey component and Crangon hakodatei was the most important prey component in Macrura. The result of analysis in ontogenetic changes significantly exhibited among three size classes (<15.0 cm, 15.0~20.0 cm, ≥20.0 cm). The proportion of Macrura decreased as increasing body size, whereas the consumption of Pisces increased gradually. As body size of C. myriaster increased, the mean weight of prey per stomach (mW/ST) increased (one way-ANOVA, P<0.05).

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.57 no.2
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• pp.117-126
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• 2021

Diet composition and trophic level of Trachurus japonicus were studied using 417 specimens collected by trawls, set nets and purse seine fisheries from March 2019 to February 2020 in the South Sea of Korea. The size of T. Japonicus ranged from 7.0 to 49.8 cm in total length. T. japonicus were a carnivore that fed mainly on euphausiids and pisces. In eddition, T. japonicus fed on small quantities of cephalopods, crabs etc. T. japonicus showed ontogenetic changes in feeding habits. The proportion of euphausiids decreased inversely proportional to body size whereas the consumption of pisces gradually increased. As body size of T. japonicus increased the mean number of prey per stomach and the mean weight of prey per stomach tended to increase, but the mean number of prey per stomach was not significantly different. As a result of the feeding strategy analysis, T. japonicus were specialized feeders with pisces and euphausiids as their dominant prey. The trophic level ranged between 3.57 ± 0.54 and 3.91 ± 0.65, and increased asymptotically with size of specimens. The average trophic level of the T. japonicus was 3.79 ± 0.61.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.54 no.1
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• pp.73-79
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• 2021

The feeding habits of Chub mackerel Scomber japonicus were investigated using 329 specimens collected from coastal waters of the South Sea of Korea. S. japonicus is mainly a piscivore, consuming small fish such as Engraulis japonicus (%RI: 81.0 %). The diet of Chub mackerel also includes small quantities of thaliaceans, euphausiids, and amphipods. We calculated the trophic level as 3.92 for S. japonicus. The dietary composition of S. japonicus did not show significant differences with size, but differed with season. As the body size of S. japonicus increased, the mean weight of prey within the stomach (mW/ST) increased (One-way ANOVA, P<0.05).

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.139-140
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• 2022

자율운항선박은 사람이 없다는 전제를 두고 개발되고 있지만, 완벽한 자율운항이 되기까지는 많은 시간이 필요할 것이다. 이러한 경우, 발생 가능한 모든 경우의 수를 고려하여 시나리오를 구축하는 것이 중요한데, 자율운항 선박에 대한 사고는 아직 발생한 바가 없기 때문에 시나리오를 구축하는 것은 어렵다. 이에, 본 연구에서는 기존 조사된 해양사고 사고·사례를 통해 아직 발생한적 없지만 발생가능 확률이 높다고 생각되는 사고 시나리오를 구축하여야 한다. 이러한 시나리오가 있다면 자율운항선박 사이의 사고 등을 확률적으로 추정할 수 있다. 한편, 해양사고의 종류는 다양하나, 본 연구에서는 위험유해물질(HNS)을 적재된 자율운항선박으로 제한하며, 최종 목표는 자율운항의 기초 단계로, 무인화 선박에서 발생 가능한 사고경로를 예측하여 화학 사고를 예방하는 것이다. 본 연구의 목적으로는 기존의 해상 화학사고 원인을 분석하여 ETA기법을 적용한 자율운항 선박에서 발생 가능한 사고 시나리오를 구축하는 것이다. 연구방법으로는 자율운항 시 발생할 수 있는 가상경로를 화학반응식으로 식별하고, ETA기법을 이용하여 화학사고가지분석(CATA, Chemical Accident Tree Analysis)모델을 구축할 예정이다.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.55 no.3
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• pp.374-378
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• 2022

The feeding habits of the Glowbelly Acropoma japonicum were examined based on 849 specimens collected from the coastal waters of the South Sea of Korea. The total length (TL) of these specimens ranged from 2.6 to 13.0 cm. A. japonicum fed majorly on Euphausia pacifica (Euphausiacea, % index of relative importance; IRI, 51.9). However with growth, its diet shifted from copepoda to euphausiacea. Overall, as the body size of A. japonicum increased, the mean weight of prey within the stomach (mW/ST) increased.