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한인성,이준수 해양환경안전학회 2020 海洋環境安全學會誌 Vol.26 No.3
We examined long-term variations in sea surface temperature (SST) and annual amplitudes of SST around the Korean Peninsula. Two SST data sets with data periods of approximately 51 years and longer than 100 years, respectively, were obtained from the National Institute of Fisheries Science and Japan Meteorological Agency. SST of Korean waters clearly increased during last 51 years (1968-2018), which was 2.5 times higher than the global trend. This significant increasing trend was caused by the dominant increasing SST trend during winter. However, a negative and positive SST anomaly frequently appeared during winter and summer, respectively, in a recent decade. These features of seasonal SST variation have changed the annual amplitude of SST, and resulted in a drastically increasing trend after 2009. Using the longer SST data set, it was revealed that the decreasing SST trend in winter began in the 2000s and the increasing SST trend in summer bagan in the 1990s. During a recent decade, there was a distinctive SST increase in summer, whereas a clear decrease in winter. In summary, the annual amplitude of SST around the Korean Peninsula significantly changed from a decreasing trend to an increasing trend during a recent decade.
Evidence of Vertical Mixing Caused by High Frequency Internal Waves along the Eastern Coast of Korea
한인성,이주,장이현,서영상,성기택 한국수산과학회 2008 Fisheries and Aquatic Sciences Vol.11 No.1
Internal waves and internal tides occur frequently along the eastern coast of Korea. During the spring-tide period in April 2003, the East Korean Warm Current (EKWC) flowed near the Korean East Coast Farming Forecast System (KECFFS; a moored oceanographic measurement system), creating a strong thermocline at the intermediate layer. Weakened stratification and well-mixed water appeared frequently around the KECFFS, with duration of approximately 1 day. The results suggest the following scenario. Baroclinic motion related to the internal tide generated high frequency internal waves around the thermocline. The breaking of those waves then created turbulence around the thermocline. After well-mixed water appeared, a current component with perpendicular direction to the EKWC appeared within the inertial period. The change in stratification around the KECFFS locally broke the geostrophic balance as a transient state. This local vertical mixing formed an ageostrophic current within the inertial period.
한인성,성기택,장이현,서영상 한국수산과학회 2008 Fisheries and Aquatic Sciences Vol.11 No.1
Harmful algal blooms (HABs) of Cochlodinium polykrikoides frequently occur around the South Sea of Korea, causing economic losses in coastal breeding grounds. HAB outbreak scale usually changes each year depending on physical, biological and environmental conditions. Relatively large-scale HABs occurred in 1995, 1997, 1999, 2001, 2002 and 2003 with respect to spatial scale, duration and maximum density. Considering HAB scale and temperature distributions around the South Sea, we found that low coastal temperatures in August correspond to enormous HAB outbreaks. Cold waters created by coastal upwellings around the southeastern coast of Korea also corresponded to these outbreaks. Serial oceanographic investigations in August in the South Sea revealed that sea surface temperature anomalies had distinctively negative values when large-scale HAB outbreaks appeared. With regard to temperature differences between the surface and the 30-m layer, there was a tendency for large-scale outbreaks when temperature gradients around the seasonal thermocline weakened.
Nitrided Pressureless Sintering에 의해 제조된 Si<sub>3</sub>N<sub>4</sub>의 산화거동
한인성,천승호,정용희,서두원,이시우,홍기석,우상국,Han, In-Sub,Cheon, Sung-Ho,Jung, Yong-Hee,Seo, Doo-Won,Lee, Shi-Woo,Hong, Kee-Soeg,Woo, Sang-Kuk 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.1
Oxidtion behavior of $Si_{3}N_{4}$ ceramics with the different porosity by the Nitrided Pressureless Sintering (NPS) were investigated in pure oxygen gas atmosphere at 1000 to $1300^{circ}C$. The thickness of formed oxide film on the surface of silicon nitride ceramics was increased with oxidation time and temperature. The oxide film thickness of 5A5Y5Si and 5A5Y10Si specimens for 100 h at 1300^{circ}C$ was about 10 $\mu$m and 20 $\mu$m, respectively. The oxidation of 5A5Y5Si and 5A5Y10Si specimens follows the parabolic behavior with an apparent activation energy of 215 kJ/mol and 104 kJ/mol, respectively. The flexural strength of 5A5Y5Si specimens after oxidation test for 500 h at 1300^{circ}C were maintained as-received value of 500 ma. On the other hand, that of 5A5Y10Si specimens were decreased about 100 MPa in as-received value. 질화상압동시소결(NPS) 공정에 의해 제조된 기공율이 다른 질화규소 소결체에 대해 $1300^{circ}C$ 순산소 가스분위기에서 산화거동을 조사하였다. 질화규소 세라믹스 표면에 형성된 산화층의 두께는 산화 시간과 온도에 따라 증가되었으며, $1300^{circ}C$에서 100시간 산화시킨 5A5Y5Si와 5A5Y10Si 시편의 산화층 두께는 각각 10$\mu$m와 20$\mu$m이었다. 5A5YSi와 5A5Y10Si 시편의 산화는 각각 215kJ/mol과 104kJ/mol의 활성화 에너지를 갖고 포물선적 거동을 나타내었다. $1300^{circ}C$에서 500시간 산화시킨 후, 5A5Y5Si 시편에 대해 꺾임 강도를 측정한 결과, 초기의 약 500MPa값을 유지하고 있었으며, 반면 5A5Y10Si의 경우에는 초기의 값에서 약 100MPa의 강도저하를 나타내고 있었다.
음향을 이용한 동해 남부해역에서 어류와 동물플랑크톤의 관계
한인성,오우석,윤은아,서영상,이경훈,신형호 한국수산해양기술학회 2017 수산해양기술연구 Vol.53 No.4
This study was conducted to understand the relationships between fish and zooplankton of distribution in the coastal waters of the East Sea from May to August 2016 using hydroacoustic. To distinguish between fish and zooplankton, we used the time varied threshold (TVT) method at the frequency of 120 kHz. As a result, the mean nautical area scattering coefficient (NASC) of fish was highest at 913 m2/n.mile2 in June and lowest at 315 m2/n.mile2 in July. The mean NASC of zooplankton was highest at 247 m2/n.mile2 in May and lowest at 70 m2/n.mile2 in July. The mean NASC of fish and zooplankton showed a significant difference (P < 0.05) with high correlation (R2 = 0.84). In addition, there was no significant difference in the mean NASC of fishes and zooplankton by depth (t-test, person correction = -0.17, p > 0.05). 본 연구에서는 음향을 이용하여 동해 남부 연안 해역에서 포식자와 먹이생물의 분포 관계를 파악하기 위하여 2006년 5월부터 8월까지 월별로 조사를 수행하였다. 어류의 평균 면적산란계수는 6월에 913 m2/n.mile2으로 가장 높게 나타났고, 7월에 315 m2/n.mile2으로 가장 낮게 나타났다. 동물플랑크톤의 면적산란계수는 5월에 247 m2/n.mile2으로 가장 높았고, 7월에 70 m2/n.mile2으로 가장 낮았으며, 어류와 동물플랑크톤의 평균 면적산란계수는 높은 양의 상관성 (R2=0.84)과 유의한 차이 (P<0.05)가 나타났다. 또한 수심별 어류와 동물플랑크톤의 평균 면적산란계수는 유의한 차이 (t-test, person correction=-0.17, p>0.05)를 나타나지 않았다.