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최진석,조철희,신용석,고송균,손순채,김정섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
As a result of separating river sand and sea sand into the corrosion increased according to the of thinnss or the coating and the Chloride Content and Corrosion of Steel Bar through the experiment, the following conclusions are obtained. 1. There was no corrosion in the case of treating the steel bar with anticorrosive among test specimens cured in the air for 60 days, corrosion was found in the test specimens not treated with anticorrosive and for 60 days of age. 2. The area of corrosion increased according to the thinnss of the coating and the chloride content wher exposed for are more than 60 days. Therefore, it was determined in general that the corrosion progressed more rapidly in water cured specimens than in air cured ones and this was due to the influence of C1_( ̄) in the sea sand.
신성균(Sung-Kyoon Shin),김용원(Yong-Won Kim),이철우(Cheol-Woo Lee),황인철(In-Cheol Hwang) 한국자기학회 1991 한국자기학회 학술연구발표회 논문개요집 Vol.1 No.1
현재까지 진행된 연구결과는 다음과 같다.<br/> 1) 배합조성의 미세조절 및 제공정실험 결과, 대체적으로 규격에 근접한 core 재료특성과 형상을 얻었다.<br/> 2) Front core 의 가공 (특히 gap성형) 및 Back core 의 분말성형은 양산과 관련하여 연구가 계속되어야 할 부분이다.
한국인에서 Adult Onset Still`s Disease의 임상상과 예후 인자에 관한 연구
조균석 ( Kyoon Seok Cho ),유대현 ( Dae Hyun Yoo ),윤형란 ( Hyung Ran Yun ),이명호 ( Myong Ho Lee ),이제경 ( Je Kyung Lee ),심승철 ( Seung Cheol Shim ),장대국 ( Dae Kook Chang ),유태석 ( Tae Seok Yoo ),고희관 ( Hee Kwan Koh ),김태 대한류마티스학회 1998 대한류마티스학회지 Vol.5 No.1
Objective: This study was undertaken to review the disease course, clinical and laboratory manifestations, prognosis and treatment of adult onset Still`s disease (AOSD) in Korea. Methods: Thirty-two patients with AOSD were enrolled from 1986 to 1997 in Hanyang University Hospital. Diagnosis of AOSD was based on the criteria proposed by Yamaguchi. We classified the disease course into self-limited, intermittent, or chronic disease course. Results: Twenty-four (75%) patients were female. Skin rash occurred in 28 (88%) patients, lymphadenopathy in 8 (25%), hepatomegaly in 4 (13%), and pericarditis in 2 (6%) out of 32 patients. The most commonly affected joints were knee joints (88%). Elevated LDH was seen in 18 (60%) patients and decreased CK in 17 (61%) patients. Rheumatoid factor was detected in 4 (13%) patients and ANA in 12(38%) patients. Anemia (Hb<10 g/dL) was seen in 13 (41%) patients and hypoalbuminemia (<3.5 g/dL) in 14 (52%) patients. Elevated ferritin (≥300 ng/mL) level was seen in 23 (79%) patients. Twenty-five (78%) patients had elevated serum transaminase. Bone marrow studies were performed in 16 patients. Nine out of 16 patients showed hyperplasia of the myeloid series and 2 patients displayed the features of a hemophagocytic syndrome. The mean duration of follow up of 32 patients was 32 months (range 3-108). Eight (27%) patients had a self-limited, 9 (30%) an intermittent, and 13 (43%) a chronic disease course. The hypoalbuminemia was significantly associated with an intermittent or chronic disease group(p<0.05). Thirty-two patients received systemic corticosteroids and 21 patients received single or combination of disease modifying antirheumatic drugs. Conclusion: We found that hypoalbuminemia at presentation was significantly associated with an unfavorable outcome, intermittent or chronic disease group. The clinical manifestations and disease course of AOSD in Korea were similar to those previously reported in other countries except significantly lower incidence of lymphadenopathy, hepatomegaly, and pericarditis.
Lee, Cheol Min,Jeong, Hu Young,Yoon, Aram,Mok, Yong-Kyoon,Sohn, Dong-Seong Elsevier 2018 Corrosion science Vol.139 No.-
<P><B>Abstract</B></P> <P>Zr-1Nb-1Sn-0.1Fe alloy was pre-oxidised at 1200 °C and subsequently oxidised at 1012, 1100, and 1200 °C. The preformed oxide enhanced the oxidation resistance at 1012 and 1100 °C, but not at 1200 °C. The microstructures of the preformed oxides subsequently oxidised at 1200 °C were compared with those of the preformed oxides subsequently oxidised at 1012 and 1100 °C. The preformed oxide probably contained more intergranular cracks and liquid Sn precipitates, and less twin boundaries during the subsequent oxidation at 1200 °C. These microstructural differences may have caused the preformed oxide not to enhance the oxidation resistance at 1200 °C.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Microstructures of preformed oxides on a zirconium alloy were analysed by TEM. </LI> <LI> Zr-Sn type precipitates were not observed after subsequent oxidation. </LI> <LI> Many voids were formed after subsequent oxidation. </LI> <LI> Many intergranular cracks were formed after subsequent oxidation at 1200 °C. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Carcass Characteristics and Profitability Analysis Based on Slaughter Age of Hanwoo Steers
( Sang Cheol Lee ),( Hyun Ho Choi ),( Jeong Seop Shin ),( Kyoung Hoon Kim ),( Young Kyoon Oh ),( Dong Won Cheon ) 한국동물자원과학회(구 한국축산학회) 2013 한국축산학회지 Vol.55 No.4
This study analyzed optimal slaughter ages and carcass traits to investigate factors that affect farm incomes. Carcass characteristics and economical analysis of 81 Hanwoo steers previously tested(Expt. 1) and 5,826 steers from Gangwon-Do, area A(Expt. 2) were used. In Expt. 1, the strongest relationship was between the slaughter age and the carcass weight based on the R2 value, and the weakest relationship was between the slaughter age and the marbling score based on the R2. The slaughter age, marbling score, and rib-eye area of steers slaughtered from 26 to 31 months of age had a positive effect on income, but back fat thickness had a negative effect. In the economical analysis of Expt. 1, the optimal time for slaughter was 31 months of age. In Expt. 2, composed of steers slaughtered from 26 to 35 months of age in farms site of area A, the income was highest from steers slaughtered at 28 months of age, after which the income decreased. From the results of Expt. 1 and 2, it is evident that the optimal slaughter age of Hanwoo steers is affected by the genetic differences of calves, the feeding program and management, fattening skills, or carcass price. In order to improve the income of individual farms, the slaughter age must be precisely decided by understanding the exact relationship between the feeding cost of Hanwoo steers and slaughter results, such as carcass weight, yield grade and quality grade.
Influence of L-Tyrosine on Blood Pressure and Heart Rate
Kim, Kyoon-Hong,Choi, Cheol-Hee,Kim, Sang-Hoon,Choi, Dong-Joon,Kim, Bong-Han,Lee, Jong-Jin,Kim, Yong-Tae,Lim, Dong-Yoon 朝鮮大學校 附設 醫學硏究所 1991 The Medical Journal of Chosun University Vol.16 No.1
The present study was aimed to investigate the effect of L-tyrosine on the cardiovascular effects in rats anesthetized with pentobarbital and to clarify the mechanism of action . L-Tyrosine at lower dose (0.1 mg / kg) given into a femoral vein of the rat caused significantly tachycardic and hypertensive effents while higher doses (0.3, 1.0 and 3.0 mg / kg) of it produced a dose-related bradycardic and hypotensive responses. L-Tyrosine-induced hypertensive effect was significantly attenuated by pretreatment with phentolamine, clonidine and chlorisondamine but not influenced by bilateral vagotomization, debrisoquin, propranolol, cyproheptadine or diphenhydramine. The hypertension is also enhanced by atropine-pretreatment. Hypotension induced by L-tyrosine was greatly inhibited by premedication of phentolamine, debrisoquin and chlorisondarnine, while it was not affected in the presence of effects by bilateral vagatomization, atropine, clonidine, propranolol, cyproheptadine and diphenhydramine. Pretreatment with propranolol or chloisondarnine led to significant inhibition or both bradycardia and tachycardia evoked by L-tyrosine. However, there was no influence on these effects of L-tyrosine by prior administration of bilateral vagotomy, atropine, phentolamine, debrisoquin, clonidine, cyproheptadine or diphenhydramine. From these experimental data, it is thought that L-tyrosine given intravenously in the pentobarbital-anesthetized rats causes bradycardic and depressor responses at higher doses and slight tachycardic and pressor effects at smaller dose. It seems that the cardiovascular effects evoked by L-tyrosine may be mediated through sympathetic nervous system in a dose -dependent manner rather than parasympathetic dominance. L-Tyrosine이 pentobarital마취 흰쥐에서 혈압 및 심박에 대한 작용을 검토하고 그 작용의 본태를 규명하고자 본 연구를 시행하여 다음과 같은 결과를 얻었다. L-Tyrosine은 일측 대퇴정맥내로 투여시 적은용량(0.1㎎/㎏)에서는 약한 혈압상승과 심박증가작용을 나타내었으나 보다 많은 용량(0.3, 1.0및 3.0㎎/㎏) 에서는 현저한 혈압하강과 심박감소 작용을 용량 의존적으로 나타내었다. L-Tyrosine의 혈압상승작용은 phentolamine, clonidine 및 hlorisondamine 등의 전처치로 뚜렷이 약화되었으나 양측 미주신경절단이나 debrisoquin, propranolol, cyproheptadine 및 diphenhydramine등의 전처치에 의해서 별다른 영향을 받지 않았다. 한편, atropine 전처치로 L-tyrosine의 혈압상승작용은 상당히 증강됨을 나타내었다. L-Tyrosine의 혈압강하작용은 phentolamine, debhsoquin 및 Ch10risondamine등의 전처치에 의해서 현저히 억제되었으나, 미주신경절단이나 atropine, clonidine, Propranolol, cyproptadine, 및 diphenhydramine등의 존재하에서 영향을 받지 않았다. L-Tyrosine에 의한 심박감소 및 증가작용은 propranolol 이나 chlorisondamine 전처치로 현저히 감약되었으나 미주신경절단, atropine, phentolamine, debrisoquin, clonidine, cyproheptadine, 및 diphenhydramine 등의 전처치로 별다른 영향을 받지 않았다. 이상의 연구결과로보아, L-tyrosine은 마취 흰쥐정맥내로 투여시 비교적 높은 용량에서는 혈압하강과 심박감소작용을, 낮은 용량에서 약한 혈압상승 및 심박증가작용을 나타내며, 이러한 작용은 부교감신경을 통한 작용보다는 교감신경작용을 통해서 기인되는 것으로 사료된다.