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Effect of Highly Pressurized Hydrogen Gas Charging on the Hydrogen Embrittlement of API X70 Steel
Dong-Su Bae,Chi-Eun Sung1,Hyun-Ju Bang,Sang-Pill Lee,Jin-Kyung Lee,In-Soo Son,조영래,Un-Bong Baek,Seung-HoonNahm 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.4
During the use of API X70 steel as a pipeline structural material for the transportation of natural gas,hydrogen embrittlement can occur due to the hydrogen contained in natural gas. The aim of this study is toinvestigate the effects of the hydrogen content under high-pressure hydrogen gas conditions on the hydrogenembrittlement of air-cooled API X70 steel. The air-cooled API X70 steel was manufactured by hot rollingand was then air-cooled to room temperature. Tensile test specimens were held for 0 h, 1000 h, and 2000 hwithin a pressure vessel filled with 100% hydrogen gas at a gas pressure of 10 MPa, with the tensile teststhen performed at room temperature. The microstructure of the API X70 steel consists of coarse polygonalferrite, coarse pearlite, and fine acicular ferrite. The yield and tensile strength increased and elongationdecreased considerably after a holding time of 2000 h compared to those of 0 h and 1000 h within the pressurevessel. The morphology of the fracture surface changed from ductile to brittle upon hydrogen gas charging. Secondary cracks were observed in both of the hydrogen-gas-charged specimens. No external cracks wereformed on the surface of the tensile-tested specimen with a 0 h holding time; however, many external crackswere observed on the specimen surface subjected to hydrogen gas charging.
이기환,구광호,이상용,이규용,유언호,김종숙 ( Ki Whan Lee,Kwang Hoo Koo,Sang Yong Lee,Kyu Yong Lee,Un Ho Ryoo,Chong Sook Kim ) 대한소화기학회 1974 대한소화기학회지 Vol.6 No.1
The measurements of sium amylase and urine amylase for 2-1 and 2 hrs were caried ou normal perso,-s, 118 pat;:enls vith disardei s in the upp r alimentary tract, 184 patie.,ts v, ith h;le- cystopathy and 26 patients ivith acute pancreatitis. The follosving rc.su1ts were drawn: In the normal prsons, the average determination of serum amylas was 5-l. I L 21, 9. Units ' 100 m]. It shov;ed no difference by sex and age. 2 The frequezcy manifesting raise of serum amylase (the value higher than mean+2S.I),,, v,as 5 ] y in the patients with the upper G.I. Disorders, an<l 6, l,jj in the patients of chiIccys'.:>p.ithy v, ith normal features in cholecys.ograms. It, however, showed 2S. 7, of frequeny appeaiing nis:.. of serv,m an.ylase in the patients of cholecystopathy with abnorrnalities in roentgenographic exa!ii- ;iations indicating a mean value of 86. 4 31. 67 units,'l0(l ml. 3, The determination of s rum amylase in the pat,ents of acute pancreatitis was 12a. ] un!ts,'100 ml on the initial day, and it showed ahrupt diminution thereafter. 4. Each dete:mination of urine amylase for 24 and 2 hnurs was 1394. 3 .867. 43 and 15 4 -(j;, Hi units in the normal pers1ns, but there was no significant shift in the group of the uppr:.;- G,I disorders, and a little raise in the group of cholecystopathy. In the group of acute panc:eatili:., ii showed marked rais of urine amylas, ,6562, 9---4526, 3<J units for 24 hours on the se ond cia o!' ailment), revealins: subs quent gradual cle rease, (30i;>. 9 l 1927. 92 units on the sexth day',. It must b emphasized that in picture of urine amylase should be a great help for c!iagnos!.ng tli. Conditions.
한국형발사체 3단 과산화수소 추력기시스템 제어장치 아날로그 데이터 취득 스케줄링 변경을 통한 노이즈 측정오류 개선
이상현(Sang-Hyun Lee),송우근(Woo-Keun Song),오현명(Hyun-Myung Oh),이정운(Jung-Un Lee),이종철(Jong-Cheol Lee),박상준(Sang-Joon Park),이상빈(Sang-Bin Lee),이희중(Hee-Joong Lee),오상관(Sang-Gwan Oh),민병주(Byeong-Joo Min) 한국항공우주학회 2020 한국항공우주학회 학술발표회 논문집 Vol.2020 No.11
A New Rice Variety Adaptable to Direct Seeding with Lodging Tolerance, "Nonghobyeo"
Sang Jong Lim,Un Sang Yeo,No Bong Park,Byeong Geun Oh,Sae Jun Yang,Ho Yeong Kim,Heung Gu Hwang,You Cheon Song,Do Yeon Kwak,Jong Rae Kang,Woon Goo Ha,Jeom Sik Lee,Soon Chul Kim 한국육종학회 2003 한국육종학회지 Vol.35 No.1
Nonghobyeo', was derived from a mutant of Milyang 95, by pure line selection method, which was developed from the single cross between Chukei 1016 and Milyang 79, by the rice breeding team of National Yeongnam Agricultural Experiment Station (NYAES) in 19
Case Reports : A Case of Erythrodermic Dermatomyositis Associated with Gastric Cancer
Sung Woo Kim,Yoo Seok Kang,Sang Hoon Park,Un Ha Lee,Hyun Su Park,Sang Jai Jang 대한피부과학회 2009 Annals of Dermatology Vol.21 No.4
Erythroderma is an unusual cutaneous finding associated with dermatomyositis. There are only five cases of erythrodermic dermatomyositis reported in the English literature. We treated a case of erythrodermic dermatomyositis associated with a Bormann type 1 gastric cancer. The patient had a generalized, erythematous scaly eruption consistent with erythroderma and Gottron`s papules as well as a heliotrope rash; these are the hallmark skin manifestations of dermatomyositis. (Ann Dermatol 21(4) 435~439, 2009)