• Journal of Marine Bioscience and Biotechnology
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• v.6 no.2
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• pp.76-83
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• 2014

Bacteria associated with marine sponges seemed to be concerned in halogenation/dehalogenation process of natural compounds. In the present study, the effect of hexabromobenzene (HBB) on the community structure of bacteria associated with a marine sponge Axinella sp. from Chuuk State under anaerobic condition was investigated. Regardless of 100 ppm HBB, most of detected microorganisms displayed high similarity with clones reported from coral or sponges. Amongst, Desulfovibrio marinisediminis like clones were dominant. Clones affiliated with Lentisphaerae and Fusibacter paucivorans (Clostridia) were detected at the conditions without HBB but clones affiliated with Vallitalea guaymasensis (Clostridia) increased its proportion with HBB. From these results and previous reports clones affiliated with D. marinisediminis and V. guaymasensis seemed to be concerned in halogenation/dehalogenation process.

• Proceedings of KOSOMES biannual meeting
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• 2006.11a
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• pp.181-186
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• 2006

Geostationary Orbit satellite, unlike other sun-synchronous polar-orbit satellites, will be able to take a picture of a large region several times a day (almost with everyone hour interval). For geostationary satellite, the target region is fixed though the location of sun is changed always. However, Sun-synchronous polar-orbit satellites able to take a picture of target region same time a everyday. Thus Ocean signal is almost same. Accordingly, the ocean signal of a given target point is largely dependent on time. In other words, the ocean signal detected by geostationary satellite sensor must translate to the signal of target when both sun and satellite are located in nadir, using another correction model. This correction is performed with a standardization of signal throughout relative geometric relationship among satellite-sun-target points. This relative ratio called bidirectional factor. To find relationship between time and $[L_w]_N$/Bidirectional Factor differences, we are calculate solar position, geometry parameters. And reflectance, total radiance at the top of atmosphere(). And water leaving radiance, normalized water leaving radiance. And calculate bidirectional factor, that is the ratio of $[L_w]_N$ between target region and aiming the point. Then, we can make the bidirectional factor lookup table for one year imaging. So, we suggested for necessary to simulation experiment bidirectional factor in more various condition(wavelength and ocean/air condition).

• Korean Journal of Fisheries and Aquatic Sciences
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• v.30 no.2
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• pp.188-202
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• 1997

The seasonal variability of the sea surface winds over the last Sea of Korea (Japan Sea) is investigated by means of empirical orthogonal function (EOF) analysis. The combined representation of fields of three climatic variables by empirical orthogonal functions is discussed. The eigenvectors are derived from daily sea level pressure, wind speed and 10-day mean sea surface temperature (SST) during 15 years $(1978\~1992)$. The spatial patterns of the mean pressure are characterized by the high pressure in the western part and the low pressure in the eastern part. The spatial distribution of the standard deviation (SD) of pressure are characterized by max SD of 6.6 mb near the Vladivostok, and minima along the coast of the Japan. In Vladivostok, the maxima of SD of SST and south-north wind (WV) were also occurred. The representation of fields of individual meteorological variables by EOF shows that the first mode of the west-east wind (WU) explain over $47.3\%$ of the variance and the second mode of WU represents $30\%$. Especially, the first mode of the WV explain $70.9\%$ of the variance and their time series coefficients show 1-cpy, 0.5-cpy frequency spectrum. The spatial distribution of the first mode eigenvectors of SST are characterized by maximum near Vladivostok. The combined representation of fields of several variables (pressure, wind, SST) reveals that the first mode magnitudes of the variance of the combined eigenvectors (WU-PR) are increased. By means of this result, the 1-year peak and the 6-months peak are remarkable. In the three combined patterns (wind, pressure, SST), the second mode of the eigenvector (wind) is affected by the SST. Their time coefficients of the first mode show noticeable 1-year peak. The spectral analysis of the second mode shows broad seasonal signal with the period of 4-months and a significant peak of variability at 3-month period.

• Water for future
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• v.16 no.4
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• pp.221-236
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• 1983

In semi-enclosed shallow sea areas typified by the Yellow sea and the East China Sea, currents and sea surface variations are predominantly tidal. During the recent years two-dimensional numerical hydrodynamic model of the Yellow Sea and the East China Sea has been developed, based on the vertically-integrated equations of motion and continuity, capable of reproducing amplitudes and phases of the principal components of tides to satisfiable accuracy. As a subsequent development a three-dimensional hydrodynamical nymerical model covering the Yellow Sea and the East China Sea has been formulated to investigate the vertical distribution of horizontal tidal current and the response of the continented to investigate the vertical distribution of horizontal tidal current and the response of the continental shelf sea to steady uniform wind stress field imposed over the surface. Features of the M2 tidal current and the wind-induced three-dimensional current structure determined from the computation have been examined and discussed.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.05a
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• pp.759-761
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• 2001

한반도 동해의 외해역(울릉도) 및 내해역에서(포항 및 묵호)의 조사된 T/P 해면자료와 TG해면자료간의 상관성이 각각 어떻게 나타나는가를 파악하기 위하여 본 연구를 수행하였다. 이때의 1992년 10월부터 1997년 12월까지 관측된 T/P자료와 TG자료를 각각 이용하였다. 본 연구로부터 우리는 다음과 같은 몇 가지 결과를 알 수 있었다. 1) 비교적 조석의 영향이 우세한 내해역에 위치한 포항 및 묵호가 외해역에 위치한 울릉도에 비해서 낮은 상관성을 보였다. 이러한 큰 차이는 M2, S2, Kl 분조 등에 의한 조석변형 때문에 발생하는 현상이다. 이것은 주로 T/P자료에 기인하는 조석오차이다. 2) 조석변형 때문에 발생하는 신호는 해양신호와 관계없는 잘못된 거짓신호로서 이를 제거하기 위해서는 lowpass filter를 적용하는 것이 좋다. 대체로 외해역의 경우는 60일, 120일, 180일, 200일의 필터를 순차적으로 처리함에 따라 상호 두 자료간의 유의성이 점차적으로 개선되는 것을 알 수 있었으나, 내해역의 경우에는 거의 유의성이 개선되지 않는 것으로 나타났다. 3) 200일의 필터를 처리했을 때, 외해역에 위치한 울릉도는 상관값이 0.91로 매우 높은 유의성을 보였고, 그리고 내해역에 위치한 포항 및 묵호는 각각 0.58 및 0.65로서 울릉도에 비해서 상대적으로 낮은 유의성을 보였다.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 1996.10a
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• pp.34-37
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• 1996

해상풍에 의한 파랑의 발달을 다룬 모델은 1940년대 이후 실측파랑 및 기상자료로부터 이론에 기초한 경험식이 제시되었다. 이러한 경험식들은 실제의 불규칙한 해면상태를 유의파로 대표하여 유의파의 파고 및 주기를 풍속, 취송거리 및 취송시간의 함수로 나타낸 것이다. 널리 쓰이고 있는 심해에서의 모델은 SMB법과 Wilson법이 있으며 일정한 바람이 연속적으로 불어오는 안정된 정상상태에서는 SMB법이, 그리고 풍역이 시간적 공간적으로 변화가 큰 경우에는 Wilson법이 적용되고 있다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.10a
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• pp.23-26
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• 2003

정치망은 어군의 자연적인 이동 경로를 길그물로써 차단하여 어군을 운동장으로 유도한 후, 비탈그물을 통해 원통으로 들어가게 하여 어획하는 소극적 어구이다. 정치망이 수중에 형성하고 있는 공간의 규모와 형태는 해면에 떠있는 뜸의 형상 및 각 부분의 부설 깊이와 침강 수심을 조사하여 추정하고 있으나, 정치망이 설치된 해역의 조류 방향과 유속에 따라 수중 형상의 크기나 형태가 변형되어 어획량에 영향을 주는 요인이 될 뿐만 아니라 강한조류나 악천후에 의한 파손 등으로 조업 손실을 초래하기도 한다. (중략)

• Journal of Ocean Engineering and Technology
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• v.3 no.2
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• pp.17-25
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• 1989

해양에서 바람에 의해 생성된 파도를 예측하는 모델을 제시하고 이 모델의 성질을 무한 해면에서 나타내 보이고 마지막으로 파의 이송과 깊이의 영향에 관한 결과를 유한폭의 해상에서 계산해서 비교 가능한 자료와 비교해 보았다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.322-323
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• 2000

점농어, Lateolabrax maculatus는 옛부터 우리나라의 횟감으로 이용되던 어종으로 대 크기가 100cm를 넘는 대형종이다. 그리고, 성장이 빠르고 담수적응력이 강할 뿐만 아니라 수온변화에도 강해 해상가두리 및 축제식 양식대상어종으로 선호하고 있는 실정이다. 이러한 점농어의 양식활성화를 위해서는 전용 배합사료의 개발이 시급하다. 그러나 배합사료개발에 관한 연구는 거의 없어 효율적인 해면양식이 이루어지고 있지 않다. 본 연구에서는 점농어의 생산량 증대를 위한 일련의 연구로 점농어 배합사료 개발에 필요한 기초자료를 제공하기 위하여 단백질 수준을 달리한 사료를 제작, 공급하여 점농어의 사료내 단백질 요구량 수준을 알아보고자 실시하였다. (중략)

• Microbiology and Biotechnology Letters
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• v.45 no.2
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• pp.124-132
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• 2017

Microbial secondary metabolites of marine organisms are regarded as major sources of structurally and biologically novel compounds with numerous potential uses. Sponge-microbe associations are among the most interesting sources for exploring bioactive compounds. In this study, the bacterial strain Microbulbifer sp. (127CP7-12) was isolated from the Asian marine sponge Hymeniacidon sinapium collected at an intertidal zone on the west coast of Korea. Cultured bacteria produced a violet pigment, and optimal culture conditions for violet pigment production were investigated. Maximum production of the violet pigment from the strain culture was observed under the conditions of $25^{\circ}C$, pH 6.0, and 3% NaCl. Acetone provided better extraction of the pigment from fermented broth compared with ethanol and methanol. The proposed structure of the major component in the extracted crude pigment was determined via high-performance liquid chromatography, nuclear magnetic resonance, mass spectrometry, and UV spectra analyses, which showed that the metabolite was the promising bioactive compound violacein. This study describes the examination of marine bioactive materials from microbe-engaged metabolites and the ecological implications of the sponge-microbe association in a changing ocean.