• 선박안전
• /
• 통권24호
• /
• pp.4-20
• /
• 2008

Stainless steel 304 or stainless steel 630 types using propeller shaft of a small ship or a FRP fishing boat generally restrain localization corrosion and abrasion damage occurrence to shaft bearing or grand packing contact. In general, the residual stress which remains after welding or heat treatment in material can cause the stress concentration or localization corrosion. In case of small ship, stainless steel such as STS304 has long been used for propeller shaft. Meanwhile, crew of small ship tend to reuse damaged propeller shaft after repair by welding and performing heat treatment to save cost. However, it was found that reused propeller shaft by repair often caused troubles in ship's operation. In this study, the basic guideline for maintenance and treatment of propeller shaft are investigated. From the results of investigation, remarkable deterioration of the material properties and corrosion resistance on the welded work part was observed.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2013년도 춘계학술대회
• /
• pp.44-46
• /
• 2013

"93년 국내 해상교통관제시스템이 도입된 후 해상에서 선박충돌 좌초 사고 발생율은 현격하게 줄어들었다. 그러나 최근 비어선 사고가 해상교통관제센터 관제구역 밖에서 빈번하게 발생되고 있다. 이에 따라 해양경찰에서는 현실적 대응방안 마련을 위해 오는 '23년 11개소 연안VTS 센터 확대 구축 전까지 경비함정을 활용한 이동형 해상교통관제 운영체계에 관한 연구를 국내 최초 시도하고자 한다.

• 수산해양교육연구
• /
• 제21권1호
• /
• pp.68-77
• /
• 2009

In this study it will be discussed how to solve the problem of discomfort from rolling motion on the small fishing boats. Up to now, the equipments of reducing rolling system can be examined by various case, but difficult to apply small vessel by function, space and costly establishment. A way of improving the feeling of getting on a boat through the equipped sail at stern edge of bulwark top was researched and developed. The author has tested the sailing performance of the experimental skiff boat, from the signals obtained by the inclinometer in irregular waves and compared with the results got in sail on and off mode operation for 10 minutes duration at the conditions of stop and underway. These data has been analyzed in the application statistical methods. Eventually we summarize the analyzed results obtained from the vessel while stationary and underway for two cases, the vessel with a sail and the vessel without a sail. The field test was done in Jeju outer harbor. The ratio of the motion responses at resonance for the sail with and without cases indicate that under given conditions the motion was reduced by the efficiency of diminution is 4.726%, 2.792% in the stopping and 11.663%, 3.282% in the underway and mean rolling periods are 2.158, 2.142, 2.421, 2.412sec. and 1.968, 1.963, 2.089, 2.051sec. respectively. Consequently the efficiency of diminution was higher when the ship is underway and rolling periods got longer in the equipped sail.

• 수산해양교육연구
• /
• 제12권2호
• /
• pp.199-212
• /
• 2000

It is very important to investigate the hull response of a fishing vessel in the sea to ensure the safe navigation and fishing operation in rough sea by preserving excellent sea keeping qualities. For this purpose, the author measured various responses of three stem trawlers in waves using real sea experimental measuring system. The author analyzed the experimental data using the statistical and spectral analyzing method to get the characteristics of the motion responses of the vessels according to the wave height and the ship's speed. The results obtained can be summarized as follows ; (1) Rather higher response of the pitch motion due to the wave height appeared in the head sea and the bow sea than any other wave direction without relevance to ship's size. In case of the roll motion, the beam sea and the quartering sea have a high response value. The period of peak of the pitch motion and the roll motion according to the wave height in each vessel has almost same value respectively. (2) The change of response of the pitch motions deeply depend on the ship's speed in the head sea and the bow sea, but not in the other wave direction. (3) The change of response of the roll motions in the beam sea, the quartering sea and the following sea are affected by the influence of the ship's speed in 5k't to 8k't, but not related to the ship's speed in out of that range.

• 수산경영론집
• /
• 제42권3호
• /
• pp.41-61
• /
• 2011

Marine protected Areas(MPAs) are specially designated zones of the sea that are designed to secure operation of ecosystem function and to restore marine ecosystem to the original state by excluding all detrimental human activities. MPAs have been proposed in many countries as means of realizing sustainable fisheries and recently MPAs are newly receiving attention as precautionary measure for global warming and climate change. The purpose of this paper is to examine the possibility of MPAs as fisheries management tools through a wide range of literature analysis and to suggest necessity of fisheries purpose of MPAs in Korea. Establishment of marine protected area can accompany various economic benefits such as restoration of marine environment, preservation of habitats, promotion of marine tourism and so on. Especially, a lot of case studies suggested that MPAs may bring out benefits to the fishing industry as a result of enhanced stocks. Fisheries benefits of MPAs on targeted species include increased abundance, increased mean individual size and age, increased reproductive output, enhanced recruitment inside and outside refuge, maintenance of genetic diversity of stocks, and enhanced fishery yields in adjacent fishing grounds, so called spill-over. MPAs for ecosystem conservation and protection of coastal wetland have been applied appropriately and effectively, however, the Korean MPAs system is still detective due to absence of fisheries purpose MPAs. Finally, suggestions for Korean MPAs can be summarized as following four recommendations; to establish number of small-scale MPAs rather than few large MPAs, to designate island and its surrounding areas as reserve, to consider MPA design with stock enhancement program, and to undertake co-management with Eochon-Gye, the traditional coastal community in Korea.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
• /
• 제9권8호
• /
• pp.181-188
• /
• 2020

수산업은 현재 전통어로어업에서 양식업으로 패러다임이 급속히 전환되고 있으며, 수산자원 고갈, 어촌 공동화에 따른 기반 약화 등 다양한 문제점에 직면하여 있다. 이를 타개하기 위한 수산업의 기반 강화, 어촌 6차산업화, 관련 기술표준 수립, 신산업 발굴 등을 위해서 수산업의 중심산업, 주변 산업의 데이터와 공공 및 민간의 유관 데이터를 모두 포함하는 수산업 빅데이터 플랫폼의 구축이 필요하다. 데이터 센터기관이 수집, 연계, 전처리를 수행하고, 플랫폼 주관 기관이 빅데이터 플랫폼 구축, 운영 및 데이터마켓을 통한 수산업 데이터 선순환 체계를 조성하여 당면 위기 극복 및 스마트 수산업 헤게모니 확보, 가치이동의 핵심열쇠로 활용하여야 한다. 본 연구를 통하여 이를 성공적으로 추진하기 위한 정책적·기술적 빅데이터 플랫폼 구축 방안에 대하여 제안하고자 한다.

• 한국수산과학회지
• /
• 제14권4호
• /
• pp.260-264
• /
• 1981

어선에서 발생되는 수중소음을 측정하기 위하여 선미식 트롤어선인 새바다호가 수심 100m인 제주도남쪽 해역에서 운항중일 때의 구중소음을 녹음 분석한 결과를 요약하면 다음과 같다. 1) 새바다호가 운항중일 때 주된 주파수대는 $100\sim500Hz$이며 최대음압은 121dB였다. 2) 항주중의 수중소음은 속도가 증가함에 따라 음압준위가 높아진다. 3) 후진할 때의 소음은 전진할 매와 소음 spectrum도 다르고 음경준위도 높았다. 4) 기관만을 운전할 때보다 항주중일 때의 수중소음이 10dB이상 높았다. 5) 어이에서 발생되는 수중소음의 주음원은 기사소음과 프로펠라의 회전 및 선체의 진동때문인 것으로 생각된다. 6) 거리에 따른 음압의 감쇠는 주파수가 높아짐에 따라 커지고 주파수 제곱에 비례하여 감쇠하였다.

• 수산경영론집
• /
• 제33권2호
• /
• pp.127-152
• /
• 2002

This study intends to review the development of Large Purse Seine Fisheries in Korea and Japan, and subsequent changes in the fisheries regime as well as management conditions and to examine reorganization directions. In the Northeast Asian Fishing Area, each country has done mutual operation, which causes the fishery competition and controls fishery development. Besides, Exclusive Economic Zon(EEZ) established in 1996 resulted in the prominent changes of fishery development as well as fishery relationship among each country, demands reorganization of fisheries. In the Large Purse Seine fisheries, Korea and Japan are not decreasing, they are stable. In other words, the increase in one country does not necessarily make the decrease in the other country. This is a difference from the case of the bottom fishery. Japan is the highest in the cost, the management is getting worse due to decreasing fish price and shortage of labor. In the case of Korea, the stagnant productivity has been compensated by the rising fish price, but the fishery of low productivity to cut down the size. In addition, during the 1990s the environment of fishery is getting worse because of the free import fishery, shortage of labor, etc. Following the new fisheries paradigm, each country should reorganize its fisheries structure. The principle for reorganization of fisheries structure in each country should be focused on the establishment of sustainable fisheries. The reorganization of fisheries structure for each country by EEZ establishment does not mean only dividing fishing ground and fisheries resources by countries, but means that countries should cooperate together in fisheries management for long-run benefits from fisheries.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2016년도 춘계학술대회
• /
• pp.518-521
• /
• 2016

삼면이 바다로 둘러싸인 우리나라에서는 해상을 통한 물류가 전체 물류량에 90% 가까운 비중을 차지하고 있고, 중소형의 어업용 선박들도 다수 등록되어 있는 상황이다. 요즘 해상에서 발생하는 사고가 많은 인명 피해 및 바다 환경에 미치는 악영향으로 인해 해상교통관제에 대한 필요성이 증가되고 있다. 현재 해상에서 사용하고 있는 선박에 대한 정보는 크게 해상교통관제시스템(VTS)에서 활용하는 AIS 정보와 항만에서 운영하는 항만운영정보시스템(Port-MIS)으로 구분되어 있으며, 서로 간에 정보 교환이 이루어지지 않는 상황이다. 현재 어선에까지 선박 패스 장치(V-PASS) 설치가 확대되고 있는 상황에서 선박에 대한 정보가 다원화로 저장되어 관리, 운영, 활용에 효율성이 떨어지고 있다. 따라서 본 논문에서는 해상교통관제시스템을 위한 선박 정보를 통합하여 효율적으로 관리하는 방안에 대해 다루고, 구현 및 적용 방안을 제시한다.

• 환경영향평가
• /
• 제21권1호
• /
• pp.1-13
• /
• 2012

We diagnosed on status and problems of environmental assessment regarding development of offshore wind power, and also on reasonable core assessment items. Most of the coastal wind power are located on the western coastline of Korea and Jeju Island. In the selections of the site for the offshore wind farms, a previous investigations should be conducted with regard to distances from the land, stabilities from external forces (tide, wave, etc.) and topographical changes, and characteristics of the surroundings (distributions of protected area, fishing ground, artificial seagrasses, and shipping traffic). It is needed to assess dispersion of suspended solids, changes of the sea bottom, and impacts on fisheries resources and fishing activities under construction of offshore wind power. Furthermore, the responses of marine organisms to noise and vibration, impacts by electromagnetic fields, impacts on sea birds, hindrances to sea lane routes, and damaged scenery and marine protection areas are thoroughly assessed during operation processes. The consultation criteria in case of development of offshore wind farm is adjusted by focusing marine environmental impact assessment.