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최한규,박재국,백효선 江原大學校 産業技術硏究所 2009 産業技術硏究 Vol.29 No.B
Based on the data interpretation on an artificial marsh built in Chun-cheon Lake, the study analyzed flow characteristics and found that flow was unstable due to sediment of natural river but the effect of artificial marsh was similar with that of river improvement works. Flow velocity in the section of artificial marsh was found to be 1m/sec. Therefore flow velocity was stable, which could contribute to improving water quality. A flow velocity as well as stream vector was improved.
고리 및 영광 논토양에 대한 ^137Cs의 모의 사고 침적시 토양-벼 전이계수
최용호,임광묵,박효국,최희주,이한수 대한방사선 방어학회 2002 방사선방어학회지 Vol.27 No.4
고리 및 영광 원전 반경 5km 내 11곳의 논토양을 원상대로 재배상자에 채취하여 실험 온실로 운반한 후 벼의 이식 전과 생육중에 ^137Cs을 담수의 표면에 처리하였다. 이식전 처리시 ^137Cs의 토양-작물체 전이계수(m²kg^-1-dry plant)는 토양에 따라 8배 정도의 변이를 보였고 평균은 지역간 차이가 거의 없이 쌀알의 경우 1.1 x 10^-4 , 볏짚의 경우 2.7 x 10^-4 이었다. 분얼초기 처리와 수잉기 처리시 전이계수는 이식전 처리에 비해 대체로 2∼3 배 및 15∼30 배 정도 높았다. 토양 유기물 함량과 전이계수 간에는 정의 상관이 있었다. 본 실험결과에 입각하여 우리나라 논에 대한 일회성 사고침적시 적용할 수 있는 ^137Cs 전이계수의 대표치를 침적시기별로 제안하였다. Undisturbed soil blocks were taken into culture boxes from 11 paddy fields within 5 km radii of Kori and Yonggwang NPPs and carried to a greenhouse where ^137Cs was applied to the surface of standing water before rice transplanting and during its growth. Transfer factors (m²kg^-1-dry plant) of ^137Cs applied before transplanting varied with soils by a factor of about 8. The mean was 1.1 x 10^-4 for hulled rice seeds and 2.7 x 10^-4 for straw without significant regional differences. The ^137Cs applications at the early tillering stage and booting stage resulted in, on the whole, 2∼3 and 15∼30 times, respectively, higher transfer factors than the application before transplanting. A positive correlation was found between soil organic matter and transfer factor. Generic values of transfer factors were proposed for an acute accidental deposition of ^137Cs onto Korean paddy fields in different times of the year.
Tarsal Tunnel Syndrome Associated with Gout Tophi: A Case Report
Park, Sam Guk,Park, Chul Hyun,Ahn, Hyo Se Korean FootAnkle Society 2016 대한족부족관절학회지 Vol.20 No.2
Tarsal tunnel syndrome is an entrapment neuropathy of the posterior tibial nerve or its branches in the fibro-osseous tunnel beneath the flexor retinaculum. This pathology is associated with multiple etiologies, including trauma, space-occupying lesions, and impaired biomechanics. We report a case of tarsal tunnel syndrome associated with gout tophi in a patient with untreated gout along with a review of the relevant literature on tarsal tunnel syndrome.
137Cs Concentrations in Cultivated Soils of Korea
Park,Hyo-Guk,Lee,Myung-Ho,Choi,Yong-Ho,Lim,Kwang-Muk,Lee,Won-Yun 대한방사선 방어학회 1999 방사선방어학회지 Vol.24 No.2
우리 국토의 방사선환경을 이해하고 사고에 대비한 베이스라인 데이타를 축적하기 위하여 전국 33 지역의 논과 밭에서 15 cm 깊이로 토양을 채취하고 γ-스펙트로메트리법으로 Cs 농도를 측정하였다. 토양증 ??Cs의 농도는 논에서는 0.7∼17.7 ㏃/㎏-dry, 밭에서는 1.2∼27.8 ㏃/㎏-dry의 범위로 평균은 각각 6.9 ㏃/㎏-dry 및 9.9 ㏃/㎏-dry였다. 토양중 Cs의 농도는 논에서는 유기물 함량과 정의 상관이, 점토 함량과는 부의 상관이 있었고 밭에서는 양이온치환용량과 정의 상관이 있었다. 토양 유기물이 경작지 토양중 Cs의 농도변화에 중요한 역할을 하는 것으로 드러났다. For understanding the radiation environment in the land of Korea and acquiring baseline data to be referred to at the time of a nuclear accident, cultivated soils in the 0∼15 cm layer were sampled at 33 sites scattered all over the country and Cs concentrations were measured by γ-spectrometry. The soil Cs concentrations were in the range of 0.7∼17.7 ㏃/㎏-dry in the paddy field and 1.2∼27.8 ㏃/㎏ in the upland field. The means were 6.9 ㏃/㎏-dry and 9.9 ㏃/㎏-dry, respectively. In the paddy field, the soil ?/Cs concentration was positively correlated to the organic matter content and negatively correlated to the clay content. In the upland field, it was positively correlated to the cation exchange capacity. It was revealed that soil organic matter plays an important role in the change of soil Cs concentration.
Kim, Hyo-Jin,Lee, Ho-June,Jun, Joon-Il,Oh, Yumin,Choi, Seon-Guk,Kim, Hyunjoo,Chung, Chul-Woong,Kim, In-Ki,Park, Il-Sun,Chae, Han-Jung,Kim, Hyung-Ryong,Jung, Yong-Keun National Academy of Sciences 2009 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.106 No.36
<P>Osteopontin (OPN) is highly expressed in cancer patients and plays important roles in many stages of tumor progression, such as anti-apoptosis, proliferation, and metastasis. From functional screening of human cDNA library, we isolated OPN as a caspase-8 substrate that regulates cell death during hypoxia/reoxygenation (Hyp/RO). In vitro cleavage assays demonstrate that OPN is cleaved at Asp-135 and Asp-157 by caspase-8. Cellular cleavage of OPN is observed in apoptotic cells exposed to Hyp/RO among various apoptotic stimuli and its cleavage is blocked by zVAD or IETD caspase inhibitor. Further, over-expression of OPN, the form with secretion signal, inhibits Hyp/RO-induced cell death. Caspase cleavage-defective OPN mutant (OPN D135A/D157A) is more efficient to suppress Hyp/RO-induced cell death than wild-type OPN. OPN D135A/D157A sustains AKT activity to increase cell viability through inhibition of caspase-9 during Hyp/RO. In addition, OPN is highly induced in some tumor cells during Hyp/RO, such as HeLa and Huh-7 cells, which is associated with their resistance to Hyp/RO by sustaining AKT activity. Notably, OPN C-terminal cleavage fragment produced by caspase-8 is detected in the nucleus. Plasmid-encoded expression of OPN C-terminal cleavage fragment increases p53 protein level and induces apoptosis of wild-type mouse embryonic fibroblast cells, but not p53(-/-) mouse embryonic fibroblast cells. These observations suggest that the protective function of OPN during Hyp/RO is inactivated via the proteolytic cleavage by caspase-8 and its cleavage product subsequently induces cell death via p53, postulating caspase-8 as a negative regulator of tumorigenic activity of OPN.</P>