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Manufacturing and Performance Teste of In-pile Creep Measuring Machine of Zirconium Alloy
최용,김봉구,강영환 한국원자력학회 2000 春季學術發表會論文集 Vol.2000 No.-
하나로 내에서 지르코늄 합금의 조사 크립시험을 수행하기 위한 조사 크립 시험용 크립시험장치의 목합(mock-up)을 설계·제작하고 부품별 성능시험을 수행하였다. 목합은 하나로에 적합하도록 직경과 길이가 각각 55×700mm이었다. 하중은 가스압에 의하여 벨로우즈(bellows)를 균일하게 수축시켰고 回자형 이음쇠(yoke)와 그립(grip)을 통하여 시편에 전달되었다. 그립에 설치된 시편의 변형량은 이은쇠와 밀대(push rod) 및 환형 베어링을 통하여 선형변위차등변압기에 정확하게 전달되었다. 하중에 따른 시편의 변위는 선형변위차등변압기(Linear Voltage Differential Transformer, LVDT)와 압력계를 사용하여 측정하였다. 이를 통하여 직경 3mm의 인장 시편의 하중-변위 곡선을 얻었다. A mock-up of the in-pile creep test machine of zirconium alloys for HANARO was designed and manufactured, which performance tests were carried. The dimension of the in-pile creep machine is 55 mm in diameter and 700 mm in length for HANARO, respectively. Load is transferred to specimen by through the working mechanisms in which the contraction of bellows by gas pressure moves a yoke and an upper grip connected to a specimen, simultaneously. It was observed that the extension of the specimen mounted in grips was transferred to a linear voltage differential transformer perfectly by a yoke and a push rod in a bearing. The displacement of specimen with applied pressure was determined with the LVDT and a pressure gauge, respectively. Resultant stress-strain behaviors of the specimen was determined by the displacement-applied gas pressure curve, which showed similar values obtained with a standard tensile test machine.
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최용,최형진,이승희,Choi, Yong,Choi, Hyeong-Jin,Rhee, Seung-Whee 한국자원리싸이클링학회 2018 資源 리싸이클링 Vol.27 No.4
플라스틱은 용기, 포장재, 필름 등 다양한 분야에서 사용이 증가하고 있으며, 플라스틱 사용의 증가에 따라 폐플라스틱의 발생도 증가하고 있는 추세이다. 국내의 폐플라스틱은 폐기물 부담금, 생산자책임재활용제도와 자발적 협약 등의 제도에 의하여 관리되고 있다. 최근 폐플라스틱 수거업체에서의 수거 거부에 의한 문제에 대응하기 위하여 환경부에서는 제조 생산 - 분리 배출 - 수거 선별 - 재활용의 순환주기에 따른 재활용 폐기물 관리 종합대책을 발표하였다. 이러한 폐플라스틱 관리에 대하여 국내 폐플라스틱 관리현황과 환경부의 대책을 검토하여 폐플라스틱의 순환주기에 따른 개선방안을 제시하였다.
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만성 신부전증 환아에서 성장호르몬 투여후 성장속도의 변화
최용,문형로,양세원 대한내분비학회 1993 Endocrinology and metabolism Vol.8 No.2
We studied the effect of rhGH on the growth in seven children with chronic renal failure(CRF). All seven children showed normal GH responsed (peak GH response, more than 10 ng/mL) to classical GH provocative tests (L-dopa, Arginie), which results did not differ from that of healthy children. The change of height SDS for 1 year of rhGH treatment was from -3.47±1.31 to -2.74±1.57, which had no statistical significance (p$lt;0.1) The growth velocity during 1 year prior to and following rhGH treatment increased from 2.78±0.85 cm/hear to 11.24±7.90 cm/year, respectively, which had statistical significance (p$lt;0.05). One child who had had successful renasl transplantation showed an increase in the height SDS from -5.4 to -4.0 and an increase in the growth melocity from 3.2cm/year to 12.2 cm/year with rhGH treatment. The predicted adult height, obtained by Tanner-Whitehouse method, following GH treatment increased from 151.9±5.7 cm to 160.4±10.3 cm, which had marginally statistical significance(p=0.05) Subcutanat mass measured with triceps subcutaneous skin fold, decreased significantly with significant increase in muscle mass follwing rhGH treatment (p$lt;0.05) Through the period of rhGH treatment, we could not observe any side effect of GH treatment, such as hypothyroidism, glucose intolerance, or aggravation of renal function. Also we could not observe any exaggerated advancement of bone maturation(0.6±0.2 year/chronological year) during rhGH treatment, but less than the advancement of chronological age. (J Kor Soc Endocrinol 8: 157~163, 1993)
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최용,하태선 대한신장학회 1995 Kidney Research and Clinical Practice Vol.14 No.4
For the purpose of evaluating the origin of cultured glomerular epithelial cells(GEC), we applied immunohistochemical(IHC) and electron microscopic (EM) studies to characterize the cultured rat GEC. After isolation by differential sieving method, glomeruli were explanted and maintained in a medium(K1-3T3) consisting of equal parts of a Kl medium and conditioned medium taken from cultures of NIH 3T3 fibroblasts grown in Dulbecco's modified Eagle's mediurn plus 10% fetal calf serum. Morphologically distinct GEC grew out from the isolated glomeruli and they were cultured continuously. The grown GEC(early stage within 7 days after glomerular explantation) and continuously cultured cells were characterized by IHC using primary antibodies, such as, monoclonal antibodies to cytokeratin, desmin, Thy 1.1, and vimentin and EM methods. At the sarne time, their results were compared with those of glomerular epithelium from rat kidney sections. The inverted light microscopic features of continuously cultured GEC were similar to those of primarily cultured GEC. Both prirnarily and continuously cultured GEC stained positive for cytokeratin and negative for desmin, Thy 1.1, and vimentin, which results were identical to the IHC results of parietal cells in situ. On the contrary, visceral epithelial cells in situ stained positive for vimentin and desmin and negative for cytokeratin. These results suggested that rat GEC in primary and continuous culture, expressed IHC characteristics of in situ parietal, not visceral epithelium. We could observe junctional complexes of the desmosome type in cultured GEC which were noted in parietal epithelial cells, not in visceral cells. In conclusion, the cultured epithelial cells might be glomerular parietal epithelial cells by comparing the IHC and EM characteristics of cultured GEC with glomerular epithelium from rat kidney sections. Therefore, we can use these cultured and characterized glomerular parietal epithelial cells (GPEC) for the study of their biologic functions or of the pathophysiology of GPEC-associated diseases, such as, crescentic glomerulonephritis.
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