• Title/Summary/Keyword: Fishing Boats

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The Prevention Effect of Seawater Penetration of Gel Coat Applied in Repair of FRP Fishing Vessel (FRP 어선 보수에 적용되는 겔코트의 해수 침투 방지 효과)

  • Kang, Dae Kon;Park, Jai Hak
    • Journal of the Korean Society of Safety
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    • v.33 no.6
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    • pp.15-21
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    • 2018
  • Ships may collide with reefs or other objects during operation, when arriving or departing ports. The hull plate may be damaged due to the contact with other ships. The total number of domestic powered fishing vessels has decreased, but that of FRP fishing vessels has increased by 0.7% and the ratio of FRP fishing vessels to the total fishing vessels increased to 96%. Recently, fishing vessels has been used as fishing boats for income of non-fishermen as well as fishermen. Therefore, safety management for repair and maintenance is necessary. The penetration of moisture and moisture in the composite material such as FRP may deteriorate the mechanical properties and the salt (NaCl) component of the damaged portion may cause a relatively high deterioration in material strength. The gel coat painting is the final stage of repairs ans maintenance of FRP fishing vessels. The thickness criteria in the domestic and foreign gel coat is 0.3~0.762 mm. The joint specimens, which was immersed in seawater for 120 days, were compared with those without seawater immersion. As a result, the tensile strength was 83 ~ 121.8% and the flexural strength was 83 ~ 113% compared with the specimens without seawater immersion. According to the previous study the tensile strength decreased by more than 29% and the flexural strength decreased by more than 50% when the composite material was immersed in seawater for 1,083 hours without coating. As a result, it was found that the gel coat with 0.5 mm thickness is very effective in preventing the strength decrease of the composite material.

Risk factors and fisher positioning task during coastal gillnet fishing boat operation using UWB based positioning system (UWB 기반 측위시스템을 이용한 연안자망어선 어선원의 작업위치와 위험요소)

  • Kyung-Jin RYU;Su-Hyung KIM;Kyunghun LEE;Sunghun KIM;Sung-Jae WON;Yoo-Won LEE
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.60 no.2
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    • pp.152-160
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    • 2024
  • We analyzed risk factors of coastal gillnet fishers during fishing process and considered work safety measures to reduce safety accidents during fishing using a UWB (ultra wideband) based positioning system. The static position accuracy of the UWB based positioning system was 45 cm. When entering a port, there is a risk of falling overboard. When casting a net, there was a risk of falling overboard due to being hit by fishing gear or guards, or getting caught in a buoy line or sinker line. When hauling a net, there is a risk of getting caught between fishing gear and net hauler, and the risk of musculoskeletal disorders due to repetitive work over a long period of time. Most safety accidents during work on fishing boats are blamed on human errors of the fisher and skipper, but safety accidents occur due to a mixture of mechanical and equipment factors, work and environmental factors, and management factors in addition to human errors. Therefore, the 4E were presented as countermeasures against the 4M, which are causes of safety accidents, and the proposed measures were used to identify risk factors for operation process, comply with work safety rules, and ensure the wearing of personal protective equipments. We need to reduce safety accidents during work by making it part of our daily routine. These research results can be used in the future for optimal placement of fishing gear and fishing nets in other coastal industries where safety accidents occur frequently.

Study on the Performance of Waterjet Propulsion System for 180ton class Fishing Guard Ship (180톤 어업지도선 물분사 추진기의 성능시험 연구)

  • Jung, Un-Hwa;Kim, Moon-Chan;Chun, Ho-Hwan;Lee, Seung-Ho
    • Journal of the Society of Naval Architects of Korea
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    • v.46 no.2
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    • pp.127-135
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    • 2009
  • The performance of the waterjet system of 180 ton class fishing guard ship has been experimentally studied. A waterjet propulsion system has many advantages in comparison with a conventional screw propeller especially for high speed craft because of its good cavitation performance. Recently waterjet system has been applied to fishing boats and fishing guard ship because of avoiding a net problem although their speeds are not so high. This paper describes experimental procedure and analysis method of resistance and self-propulsion tests with a 1/14.46-scale model. Experimental results were analyzed according to ITTC 96 standard method. The full-scale effective power and delivered power of the ship were also analyzed and the full-scale speed predicted from the model test results shows a good agreement with the full-scale result from the sea trial tests.

Establishment and Application of an Integrated Platform for Navigation Safety Information (항행안전정보 통합 플랫폼 구축 및 활용방안에 관한 연구)

  • Kim, Do-Hoon
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.26 no.2
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    • pp.129-138
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    • 2020
  • This study recognizes problems in the current system of providing navigation safety information (NSI), which is centered on merchant ships, to prevent maritime accidents of fishing boats and small vessels in coastal areas. The system proposed in this study is an effective method of providing NSI to support the safe navigation of small vessels such as fishing boats. First, the status and characteristics of recent maritime accidents were examined, and NSI service targets were identified. Second, the limitations of the current NSI system were determined, and measures were proposed to establish an NSI Integrated Platform (NSIP) that ensures the integration, accessibility, and usability of NSI for a substantial portion of the public. Third, to utilize the NSIP, various NSIs are applied as additional information for the electronic chart system used in the e-navigation ship terminals being developed in connection with the Korean e-navigation project. Functions that set the audiovisual alarm function to automatically operate when a ship enters a navigation risk zone is proposed. These functions are technically achieved by reviewing expert opinions of related organizations and professional producers. The results of this study suggest that NSI can be applied to small vessels such as fishing boats, through the Korean e-Navigation project, to prevent maritime accidents caused by the human error of navigators.

A Study on the Development of Electro Magnetic Compass Using Magnetic Resistance Element (자기저항소자를 이용한 전자 컴파스 개발에 관한 연구)

  • Yang, J.H.;Kim, C.H.;Park, T.W.;Moon, D.H.;Lee, I.Y.
    • Journal of Power System Engineering
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    • v.3 no.1
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    • pp.60-66
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    • 1999
  • Most of the small-type fishing boats in this country don't have the autopilot system such as the large ships have. In this papers, we describes on the development of electro magnetic compass for the autopilot system of the small-type fishing boat, which is utilized the MR(magnetic resistance) device and the inclination sensor. And we investigated the validity of the developed electro magnetic compass through results of actual experiment.

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A Study on the Stiffener of the Watertight Bulkhead of the Fishing Boat. (강제어선(鋼製漁船)의 수밀격벽(水密隔璧) 방요재(防撓材)에 관(關)한 연구(硏究))

  • Chang-Yull,Kim
    • Bulletin of the Society of Naval Architects of Korea
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    • v.2 no.1
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    • pp.3-8
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    • 1965
  • The objects of this paper are to stimulated discussion of the criteria used for deciding the scantling of watertight bulkhead stiffener of steel fishing boats ranged of length of 20 meters to 80 meters and to suggest a method of calculation based on beam theory. Present knowledge is examined and it appears that failure of a bulkhead stiffener is comparatively rare. Regarding its structure bulkhead does not contribute on longitudinal strength of a ship. The strength of a bulkhead stiffener can be treated locally. Assuming bulkhead stiffeners are free ends and fixed ends theoretical required section modulus are calculated and compared with classification societies' rule. Welding effect of a bulkhead stiffener to bulkhead plate and a bracket to stiffener and deck plate are considered. On various conditions of joints are suggested.

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A Study on the Hull Form Development of the 25 Knots Class Planing Hull Form Fishing Boat (25노트급 활주형 어선의 기본선형 개발에 관한 연구)

  • LEE KWI-JOO;JOA SOON-WON;PARK MYUNG-KYU;SHIN YOUNG-KYUN
    • Journal of Ocean Engineering and Technology
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    • v.17 no.5 s.54
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    • pp.88-94
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    • 2003
  • A series of tests of 5 model ships, selected from a data survey of 10 Gross Tonnage actual fishing boats, were performed in two circulating water channels (Chosun University in Korea and WJFEL in Japan), in order to develop the basic hull form of a 25 knots-class fishing boat. Resistance tests, trim and sinkage measurements and wave pattern observations etc., were included in each I1wdel test, and the model test results were compared and analyzed. The result was as follows: P-4 hull form ship changed into Deep V type bow is the best hull form with good performance, especially with regard to ship's resistance efficiency.

Moving Object Tracking System for Dock Safety Monitoring (선착장 안전 모니터링을 위한 이동 객체 추적 시스템)

  • Park, Mi-Jeong;Hong, Seong-Il;Yoo, Seung-Hyeok;Kim, Kyeong-Og;Song, Jong-Nam;Kim, Eung-Kon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.10 no.8
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    • pp.867-874
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    • 2015
  • Hoist have been installed at wharfs or seashore in the center of fishing village fraternities. A Hoist is used in harbor loading and unloading fishing gear or seafoods and is a device to refloat fishing boats into a breakwater or land in case of typhoon or bad weather. In this paper, we propose image perception and moving objects tracking system that detects boat's damage, theft and trespassing occurred at the wharf. This system detects objects' motion in real time by using the motion templet and tracks to concentrate on a moving object(person, boat, etc.) by using a PTZ camera.

The Development of China′a Marin Fisheries and Reorganization of Region Fisheries in the East China Sea (동중국해에서 중국 해면어로어업의 전개와 지역어업의 재편)

  • 김대영
    • The Journal of Fisheries Business Administration
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    • v.31 no.2
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    • pp.27-45
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    • 2000
  • This study discusses the development structure of China's Marine Fisheries in the East China Sea. China's marine fisheries have developed since the 1980s along with it's economic expansion. The total catch in the East China Sea has increased especially during the 1990s. The Chinese fishery has developed remarkably through individual management, expansion of their fishing grounds from inshore to off-shore, and increase of the catch in both pelagic and bottom species. In other words, the trawl fishery in China has led to higher production. We can say that the progress in Chinese fisheries is the result of their expansion policy. Their boats have been coming closer and closer to the Japanese and Korea fishing grounds during the 1990s. Chinese fisheries is exploiting the low cost and thus strengthening its quantity. Based on rising fish price, expanding domestic fish markets as well as expels, China is enjoying the high income. However, in trawl fishery, productivity is stagnant and profit is going down due to the rising cost. In accordance with the new 200 mile EEZ system in the East China Sea, China's fisheries will be restricted mostly by the new regulation which requires the reduction of fishing efforts and the application of resource management.

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