分斷時代의 兒童文學

崔湧 한국아동문학학회 1996 한국아동문학연구 Vol.- No.5

Application of a Dynamic-Nanoindentation Method to Analyze the Local Structure of an Fe-18 at.% Gd Cast Alloy

최용,백열,문병문,손동성 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.3

A dynamic nanoindentation method was applied to study an Fe-18 at.% Gd alloy as aneutron-absorbing material prepared by vacuum arc-melting and cast in a mold. The Fe-18at.% Gd cast alloy had a microstructure with matrix phases and an Fe-rich primarydendrite of Fe9Gd. Rietveld refinement of the X-ray spectra showed that the Fe-18 at.% Gdcast alloy consisted of 35.84 at.% Fe3Gd, 6.58 at.% Fe5Gd, 16.22 at.% Fe9Gd, 1.87 at.% Fe2Gd,and 39.49 at.% b-Fe17Gd2. The average nanohardness of the primary dendrite phase and thematrix phases were 8.7 GPa and 9.3 GPa, respectively. The fatigue limit of the matrix phasewas approximately 37% higher than that of the primary dendrite phase. The dynamicnanoindentation method is useful for identifying local phases and for analyzing localmechanical properties.

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)

국내 폐플라스틱의 관리 현황 및 개선사항

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.

백서의 사구체 격측상피세포의 배양가 성상확인

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.

고추 기계수확 시스템 개발(I) - 고추 재배, 수확실태 조사 -

최용,이충근,유수남,서상룡,최영수,전현종,이채식 한국농업기계학회 2010 바이오시스템공학 Vol.35 No.6

Consumption of pepper, a major spice vegetable used for seasoning Kimchi, continues to increase, but cultivation is in decline due to shortage of rural labor in Korea. The 39.2% of total labor requirement for conventional pepper cultivation was available for harvesting work. Therefore conventional manual harvesting should be turned to mechanical harvesting for labor-saving, cost-reducing and easy work. Surveys on conventional pepper cultivation patterns, labor requirements for various pepper cultivation works, and farmers’opinions on the mechanization of pepper harvesting were conducted to obtain basic informations. The labor requirement for pepper harvesting was 954 hours/ha out of a total labor requirement of 2,436 hours/ha for pepper cultivation. Harvesting was the hardest work, and hiring workmen for harvesting was also difficult. Farmers preferred to develop a small-scale pepper harvester using agricultural tractor or cultivar. Most farmer agreed to change cultivation pattern for mechanization of pepper harvesting, but hesitated to adopt new one-time-harvesting pepper varieties.

Fabrication of Gd Containing Duplex Stainless Steel Sheet for Neutron Absorbing Structural Materials

최용,문병문,손동성 한국원자력학회 2013 Nuclear Engineering and Technology Vol.45 No.5

A duplex stainless steel sheet with 1 wt.% gadolinium was fabricated for a neutron absorbing material with high strength,excellent corrosion resistance, and low cost as well as high neutron absorption capability. The microstructure of the as-cast specimen has typical duplex phases including 31% ferrite and 69% austenite. Main alloy elements like chromium (Cr), nickel (Ni), and gadolinium (Gd) are relatively uniformly distributed in the matrix. Gadolinium rich precipitates were present in the grains and at the grain boundaries. The solution treatment at 1070 ºC for 50 minutes followed by the hot-rolling above 950 ºC after keeping the sheet at 1200 ºC for 1.5 hours are important points of the optimum condition to produce a 6 mm-thick plate without cracking.

Corrosion and Wear Properties of Cold Rolled 0.087% Gd Lean Duplex Stainless Steels for Neutron Absorbing Material

최용,백열,문병문,손동성 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.1

Lean duplex stainless steels with 0.087 wt.% gadolinium (Gd) were inert arc-melted andcast in molds of size 10 mm × 10 mm × 20 mm. The micro-hardnesses of the rolling direction(RD), transverse direction (TD) and short transverse (ST) direction were 258.5 HV, 292.3 HV, and 314.7 HV, respectively. A 33% cold rolled specimen had the crystallographictexture that (100) pole was mainly concentrated to the normal direction (ND) and (110) polewas concentrated in the center of ND and RD. The corrosion potential and corrosion rate inartificial seawater and 0.1M H2SO4 solution were in the range of 105.6-221.6 mVSHE, 0.59-1.06 mA/cm2, and 4.75-8.25 mVSHE, 0.69-1.68 mA/cm2, respectively. The friction coefficientand wear loss of the 0.087 w/o Gd-lean duplex stainless steels in artificial seawaterwere about 67% and 65% lower than in air, whereas the wear efficiency was 22% higher. The corrosion and wear behaviors of the 0.087 w/o Gd-lean duplex stainless steels significantlydepended on the Gd phases.

가족성 저인산혈증

최용 대한신장학회 1993 대한신장학회잡지 Vol.12 No.부록7

깨어 있는 意識의 눈부심과 힘

崔湧 한국아동문학학회 2000 한국아동문학연구 Vol.- No.8