• 한국해양학회지
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• v.24 no.2
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• pp.96-108
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• 1989

Applying the numerical scheme developed by Semtner (1974), we investigate the circulation system in the Japan Sea in response to the air-sea interaction and the wind. In spite of blocking straits, resulting surface circulation pattern is similar to the schematic surface current chart introduced by Uda(1934) and Naganuma (1972); the northward flow along the Korean coast and the anticlockwise gyre in the northeastern part of the Japan Sea. Also the southward current flows along the Korean coast at depth of 100-200 m as similar to the North Korean Cold Current suggested by Kim and Kim (1983). And the sinking phenomenon of relatively saline water in the northeastern part of the Japan Sea is similar to the formation of the Japan Sea Proper Water.

• Journal of Korean Society for Geospatial Information Science
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• v.11 no.3 s.26
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• pp.41-46
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• 2003

Marine geographical names refer to the names for the geographical forms in nature such as oceans, straits, bays, inlets, and channels as well as the various undersea form including reefs and trenches. Marine geographical forms, lying under the sea, are different from those in land and are related directly and indirectly to the safe navigation of ships, that is, property and life of human beings. Marine geographical names have not been correctly named and used so far as in the case of using the name 'Sea of Japan' instead of 'East Sea' Marine geographical names have been created arbitrarily from various sources including researchers, institutes, and academic societies, which leads to confusion and makes it difficult for those to be acknowledged internationally. This paper examines the uniqueness and technicality of marine geographical names and analyzes the efforts and status for the standardization processes in Korea.

• 한국해양학회지
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• v.24 no.1
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• pp.29-38
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• 1989

It has been believed that the circulation in the Japan Sea involves separation of current from the Korean coast and formation of a cold cyclonic gyre in the north. To explain this, a simple quasi-geostrophic linear model is considered. The model is basically of an inflow-outflow system. The local forcings, wind and air-sea heat exchange together with damping (both mechanical and thermal), are imposed upon. The results show that only the buoyancy damping due to perturbations from local thermal adjustment can cause the separation and the gyre. Various types of circulation patterns are possible depending on the intensity of the thermal forcing.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.16 no.2
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• pp.213-223
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• 1998

This paper deals with the geoid modelling in and around Korean peninsula referred to Bessel ellipsoid. Several useful data were used to compute precise geoidal heights referred to GRS80 by remove and restore technique and FFT technique was used to evaluate Stokes' integral. All grid point elevations extracted from GTOPO 30 and Bessel coordinates of all grid point were computed through coordinates transformation by applying three transformation parameters. Finally, geoidal heights referred to Bessel ellipsoid were calculated by geometric method. As the results of this study, a precise gravimetric geoid model referred to GRS80 (KOGGDM33) and geoid model referred to Bessel ellipsoid(KOBGDM33) in and around Korean peninsula were developed. KOBGDM33 shows the gradual distribution of geoidal heights from -91.8 m in Yongampo to -39.0 m in the straits of Korea.

• Korean Journal of Ichthyology
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• v.12 no.2
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• pp.124-128
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• 2000

A total of 46 Gnathagnus elongatus larvae, 2.7~8.7 mm BL (Body length), were collected by bongo net and trawl-shaped fish larvae net in the coastal area of Cheju Island during 1997~1999. This species was found in the coastal area of Cheju Island and the Korea Strait. This paper describes morphological features of these specimens throughout their development. 1) The soft ray of fin appeared at about 5 mm BL and attained to a fixed number at about 8.7 mm BL. 2) Pigments pattern changed suddenly about 3 mm BL. 3) A series of pigments in the upper and the lower part of the urostyle were found less than 4.3 mm BL. 4) The pigments of caudal peduncle were found more than 6 mm BL.

• Animal Systematics, Evolution and Diversity
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• v.19 no.1
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• pp.111-117
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• 2003

Some hydromedusae were collected from Shiwhaho (Kyonsgi-do), Korea Strait and Yeosu, Korea during years 2000-2002. They were identified into Sorsia tubulosa (M. Sars, 1835) of the order Anthomedusae, and Liriope tetraphylla (Chamisso and Eysenhardt, 1821) of the order Trachymedusae respectively. They are new to the Korean fauna. The order Trachymedusae is first recorded in Korea. The long tube-like manubrium and four marginal tentacles are characteristics of S. tubuloso. In L. tetraphylla, the four triangle-shaped gonads and their positions upon half of surface of subumbrella, the seven blind centripetal canals in a quadrant and the long fat manubrium are its distinct characteristics. Resulting from this work, the Korean hydromedusae identified so far consist of 13 species of 11 families in five orders.

• Animal Systematics, Evolution and Diversity
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• v.8 no.2
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• pp.243-258
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• 1992

For the systematic study of Korean Asteroidea the specimens collected from total 69 localities in the South Sea, Korea during the period from April, 1980 to Apirl, 1992 were indentified. As a result, 23 species, 18 genea, 8 families and 5 orders were identified of which two species, Mediaster brachiatus and Stellaster equestris have not been reported in Korea yet. Asterina perctinifera was the commonest species collected from 43 localities of 69 localities. Fifteen species were found in Korea Strait and Cheju Island area, respectively. Fifteen temperate species, 7 tropical species and 3 boreal species were found to be distributed in the South Sea of Korea. The asteroids known so far in Korea tuned out to be 43 species.

• The Southeast Asian review
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• v.21 no.2
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• pp.293-327
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• 2011

소말리아 해적 문제는 전례가 없는 단계에 다다랐다. 2010년 까지만 해도 445대가 넘는 선박이 해적들로부터 피해를 당했으며 1,181여명의 사람들이 몸값을 위해 인질이 되어야 했다. 그러나 소말리아만이 해적문제가 이슈화 되는 곳은 아니다. 지난 20년간 동남아시아의 해적문제도 큰 이슈가 되어 왔다. 본 논문은 해적 행위의 원인, 영향, 그리고 유형의 분류에 대한 분석을 위해 두 가지의 사례 연구를 통해 이를 살피려 한다. 각각의 해적 관련 사례가 서로 다른 특징들을 가지고 있으나현재 신문이나 인터넷 상의 보도뿐만 아니라 학문, 법률상의, 그리고 공식적 문서들에서 얻어지는 정보들을 이용해 분석한 결과 해적 행위의 원인은 대부분 육지에서 발견된다는 것으로 결론을 낼 수 있다. 본 논문을 통해 제 국가들은 경제, 안보, 지리적인 이유의 이해를 달리 하여 해적 행위를 근절하려 한다는 것을 살펴본다. 또한 현재의 해적 행위에 대한 대응적 접근은 전체론적으로 육지에서의 원인에 근거하여 다루어지는 것이 아니라 바다에서의 해양법 시행에 집중되어 있다. 이는 해적의 소탕을 위한 과정이라기보다는 여전히 문제를 내포하고 있을 수밖에 없다는 점을 지적 하고자 한다.

• Journal of Navigation and Port Research
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• v.39 no.3
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• pp.209-215
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• 2015

Miraculous victory of Myeongnyang sea battle turned the tide of the Joseon's entire war against Japan and it is regarded as one of the most remarkable sea victories in the world history. In the sea battle of Myeongnyang, on September 16, 1597(lunar calender), the Joseon navy with 13 battle ships, led by Admiral Yi Sun-sin, won the Japanese navy with their fleet of 133 warships. There were several reasons why Admiral Yi decided on this location for battle. Myeongnyang strait is so narrow and had currents so powerful that many ships could not pass strait simultaneously. Therefore, despite being vastly outnumbered, Admiral Yi used terrain and tidal current advantage to defeat Japanese navy's numerical advantage. In order to find out the tidal state of Myeongnyang strait on September 16, 1597, topological phase of sun and moon was studied by orbital period of earth and moon. The tidal state of Myeongnyang strait on September 16, 1597 is estimated based on the theories of tide and tide tables. As a result of this study, time of slack water were found to be 0636, 1248, 1906 and time/speed of maximum tidal current were found to be 0930/8.3kts(NW), 1612/9.9kts(SE).

• Economic and Environmental Geology
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• v.46 no.2
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• pp.93-104
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• 2013

Daejiguksaptapbi (Tapbi) is a memorial stele which is inscribed with personal history of a state preceptor, Daejiguksa Beopkyeong. The Tapbi comprises tortoise-shaped pedestal, dragon top and body stone, and the body stone is remained in 255 pieces by excavation in Samcheonsaji temple site of Seoul. The Tapbi is composed of tuffaceous breccia for the body, coarse-grained pink feldspar granite for the pedestal and fine-grained granite for the top. As a result of geological survey to find a rock provenance of the Tapbi rock, the tuffaceous breccia is found in the banks of Gangwha straits, and the pink feldspar granite and fine-grained granite are found around the temple site in Mt. Bukhansan. Each rock shows similarities to the Tapbi in lithology and mineralogy. Also, geochemical data of major, some trace and rare earth elements verify their cognation in each rock type. It can be interpreted that the provenance of the body stone is distant as Gangwha area, and the provenance of the pedestal and top stones are near the temple site. The results can be utilized to restore the Tapbi by using the same rocks.