• 수산해양기술연구
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• 제55권3호
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• pp.198-205
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• 2019

The small yellow croaker (Larimichthys polyactis) is one of the representative high-class fish species in Korea. The catch of small yellow croaker in adjacent water fisheries has been continuously decreasing from 59,226 tons in 2011 to 19,271 tons in 2016. The small yellow croaker is caught by gillnet, stow net and bottom trawl, among which about 55~65% is caught by gillnet. For the sustainable use of small yellow croaker, the fishing power of small yellow croaker drift gillnet is very important. Therefore, the change of fishing power index were analyzed to identify the development of the vessel and gear technology that may have improved the fishing efficiency of the small yellow croaker drift gillnet fishery from 1960s to 2010s. Gross tonnage and horse power per fishing vessel was increased annually. The mesh size was 75.0 mm in the 1960s, but reduced to 60.6 mm in the 1980s and to 51.0 mm in the 2000s. In the 1960s, it was hauled out by manpower. However, the net hauler were modernized and supply rate was also increased since 1970. Due to the mechanization of the net hauler, the number (length) of used net gradually increased from 1.5 km in the 1960s to 7.5 km in the mid-1980s and to 15 km in 2010. Colour fish finders and positioning system were introduced and utilized from the mid-1980s. Surveys on the supply and upgrading of fishing equipment utilized visiting research. Therefore, the relative fishing power index in the small yellow croaker drift gillnet fishery increased from 1.0 in 1980 to 0.8 in 1970, to 1.1 in 1990, to 1.6 in 2000 and to 1.9 in 2010. The results are expected to contribute to reasonable fisheries stock management of the small yellow croaker drift gillnet fishery.

• 해양환경안전학회지
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• 제5권2호
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• pp.45-55
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• 1999

The majority of fishing vessels(under 20 tonnages) in Korea have a high casualty accident of the flood and capsizing occurred by lack of stability. Actually, it is so difficult to make out the data of inclining and stability tests of small fishing vessels after building, because most of them were built on experiences of manufacturer. According to above reasons, the aim of this study is an attempt to propose a stability criteria of small fishing vessels as follows: Firstly, it is examined that the stability is driven from a transverse metacenter height of actual ships, which is able to obtain a basic drawing and stability data. Secondly, it is examined the heeling at high-speed turning, and the period of rolling according to B/D(breadth/depth). Finally, it is suggested the stability criteria by using a dynamic state which is applied in passenger boat and fishing vessels over 24 meters.

• 해양환경안전학회지
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• 제28권2호
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• pp.262-269
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• 2022

최근 10년간 국내에서 발생한 해양사고현황에 따르면, 총톤수 10톤 미만의 소형어선이 차지하는 비중은 전체 해양사고 중 47.51%로 높게 확인되었다. 또한 해양사고의 증가추세 역시 다른 선종/크기(총톤수)에 비해 매우 가파르게 증가하고 있어 이에 대한 대책마련이 시급한 실정이다. 한국해양교통안전공단에서는 소형어선의 선박검사제도 개선방안으로 자체검사제도의 도입을 제안한 바 있으며, 해양수산부에서는 최근 비대면 검사방법의 도입을 위해 '원격방식에 의한 선박검사 지침'을 마련하여 시행하였다. 본 연구에서는 소형어선의 해양사고 감소 방안으로서 자체검사승인제도를 제시하고, 원격방식의 선박검사제도의 정형화 방안마련을 위해 모바일 애플리케이션을 개발하여 실효성을 분석하였다. 그 결과 어선소유자의 자발적인 안전관리를 유도하기 위한 자체검사승인제도의 도입과 함께 모바일 애플리케이션 기반 선박검사제도 도입의 필요성이 확인되었으며, 자체검사승인제도는 선박소유자의 안전의식을 고취시켜 해양사고 감소에 대한 실효성이 있음을 확인하였다.

• 수산해양교육연구
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• 제27권6호
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• pp.1734-1744
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• 2015

Majority of marine accidents that occur on fishing vessels are engine accidents. This comprises more than 26 % of the total annual fishing vessel marine accident cases. Large numbers of engine accidents happen in the cooling water system, which are mostly caused by negligence on regular check-up and repair. Notably, small-sized ships have higher engine accidents occurrence rate compared to medium-and large-sized ships. Based on the Report of the Korea Ship Safety Technology Authority, engine accident cases reached 3,032 out of the total 3,081 cases. This study researches on the differences between the small-sized ship pilot, an operator of a vessel engine of less than 200 tons, and a 6th level marine engineer, in terms of the relationship between management forms and what causes the marine accidents in association with the cooling water system. It also studies and analyzes the differences in frequency of the accident occurrence between the two groups. ${\chi}^2$ qualification was imposed through the SPSS statistical analysis program and it got qualified at the significance level of 5%. The research shall be utilized as one of the base line data for the reduction of marine accidents.

• 수산해양기술연구
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• 제40권4호
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• pp.304-310
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• 2004

본 연구에서는 10톤급(9.77 G/T) 소형 연안어선의 저항성능을 회류수조를 이용한 모형시험을 통하여 조사하고, 저항성능개선을 위한 선형특성과 초기 트림에 대한 영향을 검토하였다. 본 연구를 통하여 다음과 같은 몇가지 결론을 도출할 수 있다. (1) 선미 A.P. 이후 돌출부 길이를 키우는 것은, 트림이 억제되면서 선수부 쇄파 현상이 커질 수 있으나, 선미단에서 빠져나가는 유체의 흐름을 개선시켜 저항성능을 크게 향상시킬 수 있다. (2) 적절한 초기 트림을 줌으로써 저항성능이 크게 개선될 수 있다. (3) 선수부 유체흐름을 개선시키기 위해 챠인의 폭을 줄인 선형보다는 이 폭을 그대로 유지하는 것이 파가 선체의 선측을 타고 올라가는 것을 방지하고 트림을 키워 성능측면에서 유리하게 작용한다.

• 수산해양기술연구
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• 제43권1호
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• pp.62-70
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• 2007

Marine casualties of vessel are serious problems on social and national aspects, because it results in sacrifice of lives, a great lose of properties and marine pollution. According to recent statistics of marine casualties of vessel, fishing boats are more likely to be ended in the casualty, and especially, small fishing boats cause much more accidents than any other big vessels. Most of marine casualties were caused by the human factors such as poor watch keeping, inadequate manoeuvering and negligent action for engine, etc. This study is intended to provide navigator of small fishing boat with a specific information of necessary to assist both the manoeuvering and the avoidance of capsizing. The manoeuvering characteristics of ship can be adequately judged by the results of typical ship trials manoeuvres. For this purpose, the author measured the roll responses of a small fishing boat in waves using the real sea experimental measuring system, and analyzed the experimental data by the statistical and spectral analyzing methods to get the characteristics of the roll motion responses of the small boat through the wave directions and the ship's speed.

• 해양환경안전학회지
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• 제26권1호
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• pp.22-30
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• 2020

2016년 3월 6.67톤 어선이 크레인 작업을 하던 중 복원성 상실로 인한 전복 사고가 발생하였다. 전복은 충돌, 접촉, 좌초, 화재 및 폭발의 결과로 발생한 사고는 제외하고 선박이 뒤집힌 것을 말한다. 지난 9년동안(2010-2018), 전복 사고는 전체 해양사고의 2.34%를 차지하고 있으며 증가와 감소를 반복하고 있다. 10톤 미만 소형어선의 주된 전복사고 원인은 부적절한 선적에 따른 복원성 상실이다. 어선법에 따르면 소형 어선은 복원성과 1톤 미만 제한 하중 크레인에 대해서 복원성과 예비검사를 면제해 주고 있다. 본 연구는 고성에서 발생한 소형 어선의 전복 사고 재결서의 원인으로 언급된 사항 중 크레인 증량에 따른 복원 모멘트 감소에 대해 실제 제원이 비슷한 어선을 모델링하여 이를 통해 사고 전·후의 어선 상태를 가상하여 복원성을 비교하였다. 그 결과 기존 보다 무거운 크레인으로의 교체 시에는 복원 모멘트 감소와 현단몰입각의 감소로 전복의 위험성이 증가되었다. 표준재화 상태에서는 입·출항시 보다는 어로 활동을 하고 있는 상황에서의 복원 모멘트가 감소되는 것을 확인하였다.

• Ocean and Polar Research
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• 제27권3호
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• pp.323-333
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• 2005

The paper is to serve as a guide for deciding on a desirable direction for the vessel buyback program, reviewing their performance and economic effects from fish harvest reduction due to not reaching MSY. Compared with maximum willingness to pay for vessel buyback programs designed to avoid economic losses occurring as a result of overfishing, the portions of investment costs for buyback program are so small comparatively to the range of 0.32% to 12.19% at the annual base. The economic loss effects occurred in terms of the reduction of fishing harvest are comprehensively estimated at the present value of 30,877 billion won since 1971, and exceeded the revenues for fish harvests from 1999. In order to resole fish stocks through a vessel buyback program, this paper recommends that the yield should be reduced to less than the intrinsic growth rate. Otherwise, the buyback program policy eventually fails regardless of the temporal effect of benefits. This paper further argues that technical policy tools such as fishing grounds, fishing seasons, size of fish and minimum size of meshes should be effectively utilized.

• Journal of Advanced Marine Engineering and Technology
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• 제31권8호
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• pp.990-997
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• 2007

In the last 5 years, collisions of fishing vessels have recorded about 54.6% of the total marine accidents. Specially about 64.0% of these collisions were caused by navigator's negligence of watch keeping during works. The purpose of this paper is to develop vessel detecting system that is able to receive the whistle blast of other vessel and make a warning sound and light when the fishermen can not confirm the approaching another vessel on account of fishing works. It is designed to receive the whistle signal blast by a weather tight microphone. The signal is processed by analog active filter in order to enhance the SNR(Signal to noise ratio). And this microprocessor-based system is programmed to do ADC(Analog to digital converting), FFT analysis, controls of warning sound and light.

• 대한원격탐사학회지
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• 제38권1호
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• pp.73-82
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• 2022

Marine fisheries resources face major anthropogenic threat from unregulated fishing activities; thus require precise detection for protection through marine surveillance. Korea developed an efficient land-based small fishing vessel monitoring system using real-time V-Pass data. However, those data directly do not provide information on fishing activities, thus further efforts are necessary to differentiate their activity status. In Korea, especially in Busan, longlining is practiced by many small fishing vessels to catch several types of fishes that need to be identified for proper monitoring. Therefore, in this study we have improved the existing fishing status classification method by applying Hidden Markov Model (HMM) on V-Pass data in order to further classify their fishing status into three groups, viz. non-fishing, longlining and other types of fishing. Data from 206 fishing vessels at Busan on 05 February, 2021 were used for this purpose. Two tiered HMM was applied that first differentiates non-fishing status from the fishing status, and finally classifies that fishing status into longlining and other types of fishing. Data from 193 and 13 ships were used as training and test datasets, respectively. Using this model 90.45% accuracy in classifying into fishing and non-fishing status and 88.23% overall accuracy in classifying all into three types of fishing statuses were achieved. Thus, this method is recommended for monitoring the activities of small fishing vessels equipped with V-Pass, especially for detecting longlining.