• 한국측량학회지
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• 제34권2호
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• pp.143-151
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• 2016

The distribution of seabed rock in the coastal area is relevant to navigation safety and development of ocean resources where it is an essential hydrographic measurement. Currently, the distribution of seabed rock relies on interpretations of water depth data or point based bottom materials survey methods, which have low efficiency. This study uses the airborne bathymetric Lidar data and the hyperspectral image to detect seabed rock in the coastal area of the East Sea. Airborne bathymetric Lidar data detected seabed rocks with texture information that provided 88% accuracy and 24% commission error. Using the airborne hyperspectral image, a classification result of rock and sand gave 79% accuracy, 11% commission error and 7% omission error. The texture data and hyperspectral image were fused to overcome the limitations of individual data. The classification result using fused data showed an improved result with 96% accuracy, 6% commission error and 1% omission error.

• 한국환경과학회지
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• 제6권6호
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• pp.579-588
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• 1997

In order to see the stratification related to the heat flux In Deukryang Bay, the oceanographic data on July 12, 1994 and the meteorological data of Kohung and Kwangju meteorological stations were analysed. The temperature durerences between the sea surface and the near bottom were 1~3 ton spring tide (July 12, 1994) In Deukryang Bay. The temperature anomalies were high about 3t during summer In 1994. These mean that the non mixing was not effective In destroying the stratification due to the sea surface heating by the solar radition, even though it was on spring tide. The maximum solar radiation was about 600 ly/day, which was the value of the same date of oceanographic observation. The sensible and the latent heat flux which are 0~100 ly/day were not so varied during summer. The absorbed heat flux through the sea surface was mostly lost by the back radiation. which ranges are about 0~-400 ly/day. The dimensionless mixing parameter related to the buoyancy flux was 5~150$\times$$10^{-5}$. The efficiency of tidal mixing to destroy the stratecation was 0.4~0.6%.

• 한국해안해양공학회:학술대회논문집
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• 한국해안해양공학회 2002년도 한국해안해양공학발표논문집 Proceedings of Coastal and Ocean Engineering in Korea
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• pp.191-197
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• 2002

The prediction of the dynamic behaviors of buoyant water discharges into a large volume of water bodies, the flows of water accompanying the density differences due to temperature differences and sometimes also to salinity differences, have attracted great concern over several decades. Heated water surface discharges from power plants and freshwater discharges in estuaries are typical examples of the buoyant flows. (omitted)

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2003년도 춘계학술대회 논문집
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• pp.330-335
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• 2003

This paper deals with the network interface of research and observation instruments in the oceanographic research vessel with an establishment of related database for measured information. The system is implemented to integrated communication network system which allows to effective survey by using real time observation and GUI(Graphic User Interface). The system also consists of the LAN systems and serial interface to link chemical, physical, biological and environmental relations. And, other network service and vessel data service for data communication between vessel and earth station such as INMARSAT-B, WWW service, BBS, E-Mail etc., are needed for integrated communication network system.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 춘계학술대회
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• pp.550-553
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• 2010

미국해양대기국(NOAA : National Oceanic and Atmospheric Administration) 위성에 의해서 해수표면 수온자료를 실시간으로 제공하며, 이를 이용하여 우리나라는 한국해양자료센터(KODC : Korea Oceanographic Data Center)에서 해양과학정보를 수집 관리하여 연근해 어민 및 수산관련기관에 배포하고 있다. 그러나 원양어업을 하고 있는 선박에서는 통신요금의 문제로 제대로 제공받지 못하고 있다. 본 논문은 이를 해결하고자 수온정보 이미지의 변환, 압축을 통한 통신요금 절감 및 컬러 이미지 제공에 따른 판별력 향상에 도움을 주고자 한다.

• 한국해양학회지:바다
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• 제27권1호
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• pp.33-47
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• 2022

다중빔측심자료를 이용하여 우리나라 전 연안 해역에 발달한 해저 사퇴의 분포를 확인하고, 해역별 지형 특성을 파악하고자 하였다. 이를 위하여 국립해양조사원의 황해와 대한해협 수심자료를 이용하여 DEM 자료를 작성한 후 TPI 기법을 적용하여 사퇴의 경계를 정밀하게 추출하였다. 그 결과 우리 해역에 분포하는 총 200개의 사퇴를 확인하였으며, 그들의 규모(폭, 길이, 둘레, 면적, 높이)와 형태(폭/길이 비율, 높이/폭 비율, 선형·분기형, 노출·비노출형)에 대한 통계분석을 실시하여 사퇴의 지역별 특성을 분석하였다. 이러한 연구 결과는 연안 항해안전은 물론 해양지명 선정 지원, 해사골재자원 파악, 수산자원 관리 등에 활용될 수 있다.

• Ocean and Polar Research
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• 제34권2호
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• pp.175-183
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• 2012

A project to build a large oceanographic research ship was proposed to improve the level of ocean research. This paper attempts to measure the non-market benefits of the project. To this end, the dichotomous choice contingent valuation method is used. In particular, the recently proposed one and one-half bounded model is applied. The model can reduce the potential for response bias compared to the double bounded model, while maintaining much of its efficiency. Moreover, in order to deal with zero WTP observations, a spike model is adjusted for our data. A survey of 500 randomly selected households was implemented in the Metropolitan area. The respondents were asked in person-to-person interviews about how they would be willing to pay for implementing the project. Overall, respondents accepted the contingent market, and were willing to contribute a significant amount (3,244 won), on average, per household per year. The aggregate value of the project nationwide would amount to approximately 40.1 billion won per year.

• 한국수산과학회지
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• 제46권2호
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• pp.186-194
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• 2013

We compiled and analyzed long-term time-series data collected in Korea to evaluate changes in oceanographic conditions and marine ecosystems near Jeju Island ($33^{\circ}00^{\prime}-34^{\circ}00^{\prime}\;N$, $125^{\circ}30^{\prime}-127^{\circ}30^{\prime}\;E$) from 1981 to 2010. Environmental data included depth-specific time series of temperature and salinity that have been measured bimonthly since 1961 in water columns at 175 fixed stations along 22 oceanographic lines in Korean waters by the National Fisheries Research & Development Institute, and time series of estimated volume transport of the Tsushima Warm Current (TWC) and Korea Strait Bottom Cold Water (KSBCW) for the period from 1961 to 2008. We analyzed the species composition in terms of biomass of fish species caught by Korean fishing vessels in the waters near Jeju Island (1981-2010). Data were summarized and related to environmental changes using canonical correspondence analysis (CCA). The CCA detected major shifts in fish community structure between 1982 and 1983 and between 1990 and 1992; the dominant species were a filefish during 1981-1992 and chub mackerel from 1992 to 2007. CCA suggested that water temperature and salinity in the mixed layer and the volume transport of the TWC and the KSBCW were significantly related to the long-term changes in the fish community in the waters off Jeju Island. Fish community shifts seemed to be related to the well-established 1989 regime shift in the North Pacific. Further studies are required to elucidate the mechanisms driving climate change effects on the thermal windows and habitat ranges of commercial species to develop fisheries management plans based on reliable projections of long-term changes in the oceanographic conditions in waters off Jeju Island.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2009년도 학술대회 초록집
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• pp.167-173
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• 2009

2009년 국립해양조사원은 백령도 부근 해역에 대해 바다로 1호에 장착된 Simrad EM3000 다중빔 음향측심기를 이용한 수심측량조사를 실시하였으며 정확한 음속보정을 위해 1일 $7{\sim}10$회 이상의 음속을 관측하였다. 백령도 주변해역은 계절에 따라 여러 질 수괴(쿠로시오 난류, 황해 연안수 등)가 복잡하게 분포하여 여러 형태의 수온 전선이 형성되어 수층 음속 깊이가 최대 10m/s 이상의 차이를 나타냈다. 또한 난수괴 유입으로 인해 수온약층의 깊이가 지역별로 다르게 분포 하였다. 이러한 음속의 국지적 변화는 다중빔을 이용한 수심측량 자료의 정확도를 저하시키는 요인으로 작용한다. 따라서 다중빔을 이용한 수심측량 자료의 정확도를 저하시키는 요인으로 작용한다. 따라서 백령도 주변해역 수심측량 자료의 수평 수직 변화를 음선추적 이론을 이용하여 확인하였다.

• 한국정보통신학회논문지
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• 제8권4호
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• pp.938-945
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• 2004

남해 중부해역에서 적조발생과 관련해서 적조 다발월인 여름과 초가을에 기온과 마찬가지로 높은 수온을 유지한다. 또한 많은 강수량에 의하여 부유물질 및 영양염류가 증가하고 염분이 대체로 떨어지는 것을 알 수 있었다. 이때 적조의 bloom으로 인하여 대표적인 영양염류인 질소와 인의 값이 떨어진다. 그리고 적조생물의 사후 미생물 분해 작용이 활발하여 산소의 소모가 증가하여 용존산소가 급격히 떨어지고 화학적산소요구량이 높게 나타나는 것을 알 수 있었다. 이때 식물성플랑크톤의 성장 제한인자로 작용하는 부유물질, 인산염, 질산염의 공간분포도를 이용해서 적조발생의 잠재력을 지닌 최적지를 결정하였는데, 최적지로서는 여수∼돌산해역, 가막만 북부지역, 남해 일부해역, 나로도해역, 고흥 남부의 일부 연안, 득량만과 인접한 고흥 서부 해역이었다.