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        Stratification Variation of Summer and Winter in the South Sea of Korea

        이충일,구도형,윤종휘,김동선,Lee, Chung-Il,Koo, Do-Hyung,Yun, Jong-Hwui,Kim, Dong-Sun The Korean Society of Marine Environment and safet 2007 해양환경안전학회지 Vol.13 No.2

        Simpson and Hunter (974) 의 포텐셜 에너지 anomaly(V)를 이용하여 한국 남해의 여름과 겨울철 성층 변동 및 수온과 염분이 성층의 강도에 미치는 영향을 분석하였다. 수온 및 염분은 국립수산과학원이 1999년 8월, 2000년 2월에 실시한 정선 관측 자료이다. 8월(여름)은 남해의 외해측에서 V 값이 높게 나타나는 반면, 2월(겨울)의 경우 연안역 가까운 곳에서 높게 나타났다. 8월은 대기의 가열 현상 및 쓰시마난류의 유입 등이 V 가 증가하는 주요 인자이며, 2월은 대기 냉각 및 남해연안수의 확장이 표 저층간의 성층의 세기를 변화시키는 요인으로 작용한다. 전 시기에 걸쳐 수온이 염분보다 성층의 세기 변화에 큰 영향을 미치며, 8월에는 수온과 염분이 성층의 세기를 증가시키는 작용을 하는 반면, 2월에는 염분이 성층의 세기를 감소시키는 작용을 한다. In order to illustrate the variation cf stratification and to know the effects of the temperature and the salinity on the stratification in the South Sea of Korea, the stratification parameter defined as potential energy anomaly (PEA, $V(J/m^3)$) introduced by Simpson and Hunter (1974) was used. The oceanographic data were obtained in August 1999 and February 2000 by National Fisheries Research and Development Institute (NFRDI). V in August is generally high in offshore and low in near shore. However, in February, V in the near shore is higher than that cf the offshore due to the vertical temperature gradient between surface and bottom layer caused by the expansion of South Korean Coastal Waters (SKCW). In summer, the increase of the atmospheric heating acts on the stratification as the buoyancy forcing. In most cases, the effect cf the temperature on the stratification is stronger than that of the salinity. The temperature effect is predominantly due to the extent of the intrusion of Tsushima Warm Current into the study area. However, at stations where V is high the effect of the salinity is also significant. In winter, V is very low due to the decrease cf the buoyancy forcing, but some stations show the relatively high V due to the expansion of SKCW and salinity in winter unlike that in summer makes the stratification weak.

      • Fates of Retained Hepatic Segment IV and Its Prognostic Impact in Adult Split Liver Transplantation Using an Extended Right Liver Graft

        ( Yong-kyu Chung ),( Shin Hwang ),( Chul-soo Ahn ),( Ki-hun Kim ),( Deok-bog Moon ),( Tae-yong Ha ),( Gi-won Song ),( Dong-hwan Jung ),( Gil-chun Park ),( Young-in Yoon ),( Woo-hyoung Kang ),( Hwui-do 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1

        Aims: When splitting a liver for adult and pediatric graft recipients, the retained left medial section (S4) will undergo ischemic necrosis and the right trisection graft becomes an extended right liver (ERL) graft. We investigated the fates of the retained S4 and its prognostic impact in adult split liver transplantation (SLT) using an ERL graft. Methods: This was a retrospective analysis of 25 adult SLT recipients who received split ERL grafts. Results: The mean model for end-stage liver disease (MELD) score was 27.3±10.9 and graft-recipient weight ratio (GRWR) was 1.98±0.44. The mean donor age was 26.5±7.7 years. The split ERL graft weight was 1181.5±252.8 g, which resulted in a mean GRWR of 1.98±0.44. Computed tomography of the retained S4 parenchyma revealed small ischemic necrosis in 16 (64.0%) patients and large ischemic necrosis in the remaining 9 (36.0%) patients. No S4-associated biliary complications were developed. The peak liver enzyme levels were higher in the large S4 ischemic necrosis group (P≤0.002). The mean GRWR was 1.87±0.43 in the 9 patients with large ischemic necrosis and 2.10±0.44 in the 15 cases with small ischemic necrosis (P=0.28). The retained S4 parenchyma showed gradual atrophy on follow-up imaging studies. The amount of S4 ischemic necrosis was not associated with graft (P=0.59) or patient (P=0.24) survival. A MELD score >30 and pretransplant ventilator support were associated with inferior outcomes. Conclusions: The amount of S4 ischemic necrosis is not a prognostic factor in adult SLT recipients, probably due to a sufficiently large GRWR.

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