• ALGAE
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• 제31권4호
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• pp.391-401
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• 2016

To develop an easy and rapid method of quantifying lipid contents of marine dinoflagellates, we quantified lipid contents of common dinoflagellate species using a colorimetric method based on the sulpho-phospho-vanillin reaction. In this method, the optical density measured using a spectrophotometer was significantly positively correlated with the known lipid content of a standard oil (Canola oil). When using this method, the lipid content of each of the dinoflagellates Alexandrium minutum, Prorocentrum micans, P. minimum, and Lingulodinium polyedrum was also significantly positively correlated with the optical density and equivalent intensity of color. Thus, when comparing the color intensity or the optical density of a sample of a microalgal species with known color intensities or optical density, the lipid content of the target species could be rapidly quantified. Furthermore, the results of the sensitivity tests showed that only $1-3{\times}10^5cells$ of P. minimum and A. minutum, $10^4cells$ of P. micans, and $10^3cells$ of L. polyedrum (approximately 1-5 mL of dense cultures) were needed to determine the lipid content per cell. When the lipid content per cell of 9 dinoflagellates, a diatom, and a chlorophyte was analyzed using this method, the lipid content per cell of these microalgae, with the exception of the diatom, were significantly positively correlated with cell size, however, volume specific lipid content per cell was negatively correlated with cell size. Thus, this sulpho-phospho-vanillin method is an easy and rapid method of quantifying the lipid content of autotrophic, mixotrophic, and heterotrophic dinoflagellate species.

• 한국해양환경ㆍ에너지학회지
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• 제5권4호
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• pp.3-18
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• 2002

본 연구는 미국의 방제능력 확보기준과의 상세 비교를 통해서 우리나라 해상 방제능력 확보기준의 타당성을 검토하고자 수행되었다. 한국의 경우, 최대 300,000톤급 유조선 사고 발생시 60,000톤의 기금이 유출되고 이중 20,000톤을 해상에서 회수한다라는 가정하에 유회수기 기준으로 19,425 kl/hr의 방제능력을 확보하는 정책목표를 가지고 있다. 반면에 미국의 경우 300,000톤 유조선 사고시에 유회수기 기준으로 16,667 kl/hr의 방제능력을 현장에 동원토록 요구하고 있다. 결과적으로 30만톤급 유조선에 대한 최악유출사고를 대상으로 하여 한국은 미국보다 16% 많은 방제장비(유회수기)를 갖춰야 하는데, 이는 우리나라의 국가 방제능력 2만톤 확보 기준이 어느 정도 합리적인 수치임을 나타낸다.

• 해양환경안전학회지
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• 제30권2호
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• pp.147-156
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• 2024

수산자원의 지속 가능한 관리와 증대는 전 세계적으로 중요한 이슈로 부상하고 있으며, 본 연구는 이에 대응하는 한국수산자원공단의 수산자원 현존량 추정을 위한 딥러닝 기반 수산자원 증대사업 효과조사 기법 개발을 위해 구성 기술 중 하나인 어류 탐지 및 분류 모델 구축과 성능 비교를 수행하였다. 다양한 크기의 YOLOv8-Seg 모델에 어류 이미지 데이터셋을 학습한 후 각 성능평가 지표를 비교 분석하여 적용 가능한 최적의 모델을 선정하고자 하였다. 모델 구축에 사용된 자료는 총 12종의 어류로 이루어진 36,749장의 이미지와 라벨 파일로 이루어지며, 학습에는 증강을 적용하여 데이터의 다양성을 증가시켰다. 동일한 환경 및 조건에서 총 다섯 개의 YOLOv8-Seg 모델을 학습 및 검증한 결과 중간 크기의 YOLOv8m-Seg 모델이 가장 짧은 13시간 12분의 학습 시간과 mAP_50:95 0.933, 추론 속도 9.6 ms로 높은 학습 효율성과 우수한 탐지 및 분류 성능을 보였으며, 각 지표 간의 균형을 고려할 때 실시간 처리 요구사항을 충족하는 가장 효율적인 모델로 평가되었다. 이와 같은 실시간 어류 탐지 및 분류 모델을 활용하여 효율적인 수산자원 증대사업의 효과조사가 가능할 것으로 보이며, 지속적인 성능 개선 및 추가적인 연구가 필요할 것으로 사료된다.

• 자원ㆍ환경경제연구
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• 제12권3호
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• pp.487-513
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• 2003

환경의 지속가능한 개발을 평가하기 위해서는 환경정보의 통합이 이루어져야 하며, 그 구체적인 수단으로 환경지표와 지수의 개발이 선행되어야만 한다. 해양환경 종합지수의 작성은 해양환경계정의 기초작업으로서 의의를 가지며, 해양국가인 우리 나라에 있어 매우 유용한 연구가 될 수 있다. 또한 지수의 형태에 있어서도 국내 해양환경의 전반적인 환경상태를 나타내는 해양환경 종합지수와 각 해양부문별 상태를 나타내는 부문해양환경지수의 개발이 적절하다. 따라서 본 연구에서는 1991년부터 2001년까지의 우리나라의 해양환경 종합지수를 도출해 보고자 한다. 해양환경 종합지수는 압력-상태-대응(pressure-sate-response PSR)체계를 따르며, 지수의 각 항목 및 가중치의 도출은 다속성 효용이론(multi-attribute utility theory : MAUT)을 적용한다. 본 연구에서 작성한 해양환경 종합지수는 해양환경에 대한 연도별 압력지수, 상태지수, 대응지수와 동해, 남해, 서해의 해역별 상태지수를 제공한다.

• Ocean and Polar Research
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• 제26권2호
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• pp.361-365
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• 2004

Deep-sea Resources Research Center (DRRC) has been using a free-fall grab (FFG) for the resource evaluation of polymetallic nodules in the KODOS (Korea Deep Ocean Study) area, NE Pacific, since 1992. A FFG model (Model 4200, Benthos) adapting one glass buoy system (diameter 17 inch, net buoyance 25.4 kg) has been used until 1993. Since then, DRRC has carried out a study to increase the recovery rate of FFG and it was found that a revised system adapting an additional buoy (diameter 10 inch, net buoyance 4.5 kg) gives improved results. The nodule sampling tests were performed using two different models for the same study area and the resulting recovery rates were compared. The result shows no distinct difference in recovery time between two models, but average recovery rate of the revised model was increased to 99.44% from 96.06% of the original model.

• 수산해양교육연구
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• 제23권2호
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• pp.244-252
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• 2011

This study was carried out through survey based on job candidates of marine-bio, marine logistics, and GIS in order to train the human resources with the IT combined ability in the field of fisheries and oceans in Busan. Also, it included the survey on the field of the human resource development which businesses require in Busan. The analysis showed that food industry was most preferred by job candidates and the most required efforts for self-development to employ was to improve their English skills. The most preferred area was Busan and their salary requirements were in the 25 million to 30 million Won range. In findings on survey of businesses, businesses showed a profound interest in HACCP qualification in sea food and logitics manager qualification, and thought that the abilities that job candidates must have were communication and creativity rather than major and skills.

• 한국어병학회지
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• 제20권1호
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• pp.93-98
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• 2007

The prevalence of the scuticociliatosis in flounder farms of Jeju island was surveyed for ten years from 1995 to 2004. The occurrence ratio had maintained as less than 10% until mid 1990s, and shown increasing trends to year 1998. The ratio was equivalent to over 40% of overall disease occurrences in flounder farms since year 2000. The monthly infection rates by the scuticociliates indicated relatively higher levels from May to September, and mixed infection phenomena with bacterial disease of vibriosis were common.

• 수산해양기술연구
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• 제44권2호
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• pp.141-147
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• 2008

Acoustic telemetry technique is one of useful tools to get behavioral information of the free-swimming fish. In this study, we conducted acoustic telemetry using coded acoustic transmitters to compare behavior characteristics between wild and cultured black seabream Acanthopagrus schlegeli, one of target species to promote resource in the marine ranching area. Two wild fish and five cultured fish were released in the marine ranching area after tagging surgically. Three of cultured fish were domesticated using the remote acoustic conditioning system for 3 weeks before being released. Two wild fish stayed at the released point for 2 hours and 9 days, respectively. One of wild fish was found about 10.8km away from the released point after 5 months. Two cultured fish stayed at the released point for 6 days and 75 days, respectively. One of acoustic conditioned fish stayed at the released point for 131 days and then was found about 10.1km away from the released point after 25 days. Others stayed at the released point during this study period(159 days).

• 제어로봇시스템학회논문지
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• 제22권7호
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• pp.536-542
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• 2016

To enhance tracking efficiency, a target-tracking filter with a resource management algorithm is required. One of the resource management algorithms chooses or evaluates the proper sampling time using cost functions which are related to the target tracking filter. We propose a resource management algorithm for bearing only tracking environments. Since the tracking performance depends on the system observability, the bearing-only tracking is one of challenging target-tracking fields. The proposed algorithm provides the adaptive sampling time using the variation rate of the error covariance matrix from the target-tracking filter. The simulation verifies the efficiency performance of the proposed algorithm.

• Food Science and Biotechnology
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• 제16권3호
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• pp.367-373
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• 2007

Livers of skipjack tuna (Katsuwonus pelamis) and yellowfin tuna (Thunnus albacares) were investigated on the food compositional characteristics and also compared to that of Alaska pollack (Theragra chalcogramma). The proximate compositions of skipjack tuna and yellowfin tuna livers were high in crude protein, carbohydrate, and crude ash, while were low in crude lipid when compared to that of Alaska pollack liver. The results of heavy metal suggested that tuna livers appeared safe as a food resource. The total amino acid contents of skipjack tuna and yellowfin tuna livers were 17.7 and 17.1 g/100 g, respectively, and the major amino acids in both livers were aspartic acid, glutamic acid, alanine, valine, leucine, and lysine. Tuna livers were good sources of iron and zinc, while have low lipid content. The extractive nitrogen contents of skipjack tuna and yellowfin tuna livers were 526.5 and 468.2 mg/100 g, respectively, and their major free amino acids were taurine, glutamic acid, and alanine. From the results of taste value, the major taste active compounds among free amino acids were glutamic acid and aspartic acid.