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Observations of Southeastward Deep Currents off the East Coast of Korea
이흥재,석문식,김철호,Lie, Heung-Jae,Suk, Moon-Sik,Kim, Cheolho The Korean Society of Oceanography 1989 韓國海洋學會誌 Vol.24 No.2
Deep current was observed at 620 m and 790 m in water 840 m deep off the mid-east coast of Korea from August 26 to November 7, 1986. Data analysis showed that the deep current in the subinertial frequency range was directed to southeast with a vector-average speed of about 3 cm/s. The deep flow had a large temporal variability with the same pattern of variation at the two depths. The maximum speed of the low-frequency current reached to a value larger than 11 cm/s just after the passage of Typhoon Vera over the study area. We also observed occurrence of sharp direction changes from southeast toward north persisting for a few days.
이흥재,이석 한국해양과학기술원 2010 Ocean science journal Vol.45 No.2
Reconstruction of evenly-spaced, regular time series from routine survey serial data was investigated for precise analysis of spatio-temporal variations in a temperate sea at mid-latitudes where the seasonality dominates the interannual variability. Considering that the annual range of sea surface temperature in the Yellow Sea and the northwestern East China Sea can be as large as 15-20 ℃, temperature data collected bimonthly in these temperate seas were used for the assessment of reconstruction methodology. The cubic spline interpolation with a sampling interval of 0.5 months reconstructed the regular time series closest to the in-situ measurements among various interpolation schemes. Also, two computation methods for the interannual anomaly were compared; the residual method that the long-term monthly means are subtracted from the monthly serial data and the filtering method that high-frequency variations are removed using a low-pass filter. In that the highfrequency variations in frequencies greater than 1 cycle per year are comparable in magnitude to the interannual variation, the residual method proves inadequate in the temperate sea. Highfrequency noises can be effectively removed through the use of a proper low-pass filter with bell-shaped weights.
이흥재,Lie, Heung-Jae 한국해양학회 1984 韓國海洋學會誌 Vol.19 No.2
Water masses and circulation in the yellow Sea (Hwanghae) were briefly reviewed and synthesized. Water masses were classified into four types: Hwanghae Cold Water, Hwanghae Warm Current Water, Coastal Waters and Changjiang River Diluted Water. The Hwanghae Cold Water can be defined to have a salinity of 32.0∼33.0% and a temperature below 10$^{\circ}C$, based on long-term hydrographic data and recent CTD casts (KORI, 1984). Concerning circulation, there exists a cyclonic gyre throughout the year in the southern part. In winter, the coastal current along the Chinese coast is very strong due to northerly or northwesterly winds and the Hwanghae Warm Current becomes weak as can be expected from a surface to bottom thermohaline front west of Cheju-do. Meanwhile in summer, the Changjiang River Diluted Water flows northeastward toward Cheju-do and the coastal current in the western part is greatly reduced. The northward current during summer in the southeastern Hwanghae has been accepted to be the Hwanghae Warm Current until now, coastal waters and the Hwanghae Cold Water in the central deep area, not a continuation of the Hwanghae Warm Current.
Nutritional Requirements of Prevotella sp. Isolated from the Rumen of the Goat
이흥재,신형태,김병태,이수원,박기문,Jin Hyuk Son 한국생물공학회 2004 Biotechnology and Bioprocess Engineering Vol.9 No.4
The nutritional requirements for Prevotella sp. 4PCCNB2 isolated from the rumen of a native goat in Korea and those of the ATCC 19189 strain isolated from the bovine rumen were investigated. The two strains grew well with ammonium sulfate as the sole added nitrogen source. However, neither a complex of amino acids nor casein hydrolysate effectively replaced ammonium sulfate. Biotin, p-aminobenzoic acid, and vitamin B12 were essential to culture the ATCC 19189 strain. Unlike the ATCC 19189 strain, however, B12 was only stimulatory for the growth of the 4PCCNB2 strain. The 4PCCNB2 strain grew well in the basal medium without an individual acid such as acetic acid or valeric acid. In contrast, either acetic or valeric acid was absolutely required for the growth of the ATCC 19189 strain.