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Alloy 600 노즐관통부의 이종금속용접 잔류응력에 따른 응력부식균열 거동 분석
김성우,김홍표,김동진,정재욱,장윤석,Kim, Sung-Woo,Kim, Hong-Pyo,Kim, Dong-Jin,Jeong, Jae-Uk,Chang, Yoon-Suk 한국압력기기공학회 2010 한국압력기기공학회 논문집 Vol.6 No.2
This work is concerned with the analysis of stress corrosion cracking(SCC) behavior of Alloy 600 nozzle penetration mock-up according to a residual stress induced by a dissimilar metal welding(DMW) in a nuclear reactor pressure vessel. The effects of the dimension and materials of the nozzle penetration on the deformation and the residual stress induced by DMW were investigated using a finite element analysis(FEA). The inner diameter(ID) change of the nozzle by DMW and its dependance on the design variables, calculated by FEA, were well consistent with those measured from the mock-up. Accelerated SCC tests were performed for three mock-ups with different wall thicknesses in a highly acidic solution to investigate mainly the effect of the residual stress on the SCC behavior of Alloy 600 nozzle. From a destructive examination of the mock-up after the tests, the SCC behavior of the nozzle was fairly related with the residual stress induced by DMW : axial cracks were found in the ID surface of the nozzle within the J-weld region where the highest tensile hoop stress was predicted by FEA, while circumferential cracks were observed beyond both J-weld root and toe where the highest tensile axial stress was expected.
Mo/SiO<sub>2</sub> 촉매상에서 t-Butyl hydroperoxide에 의한 염화알릴의 에폭시화반응에 관한 속도론적 연구
김성우,박대원,정종식,박대철,Kim, Sung-Woo,Park, Dae-Won,Chung, Jong-Shik,Park, Dae-Chul 한국공업화학회 1992 공업화학 Vol.3 No.4
The synthesis of epichlorohydrin was carried out by the epoxidation of allyl chloride with tert-butyl hydroperoxide(TBHP) over silica supported molybdenum catalyst. Kinetic study was performed at $60-80^{\circ}C$ and 10 atm with the molar ratio of TBHP/Allyl chloride between 0.01 and 0.1 in a batch reactor. The epoxidation of allyl chloride was inhibited by tert-butyl alcohol and kinetic data could be represented by Michaelis-Meten type rate equation. The reaction mechanism could be explained by the combination of reversible adsorption of TBHP and tert-butyl alcohol accompanied by reaction of allyl chloride with TBHP adsorbed on $Mo/SiO_2$ catalyst. t-Butyl hydroperoxide(TBHP)에 의한 염화알릴의 에폭시화에 의해서 에피클로로히드린을 합성하는데 실리카에 담지된 몰리브데늄 촉매를 사용하였다. 속도론적 연구는 회분 반응기를 사용하여 $60-80^{\circ}C$, 10기압에서 TBHP/염화알릴의 농도비를 0.01-0.1의 범위내에서 수행하였다. t-butyl alcohol(TBA)에 의해서 염화알릴의 에폭시화 반응이 억제되었고, 반응속도는 Michaelis-Menten 형태의 속도식으로 표현할 수 있었다. 반응기구는 TBHP와 TBA의 가역흡착과 $Mo/SiO_2$에 흡착된 TBHP와 염화알릴의 표면반응으로 설명할 수 있었다.
방광에 발생한 평활근종의 초음파, CT, MRI 소견: 증례 보고
김성우,Kim, Seong-U 대한영상의학회 2004 대한영상의학회지 Vol.50 No.3
평활근종은 비뇨생식기의 어느 곳에도 생길 수 있다. 자궁에 가장 흔한 종양이기도 하지만 매우 드물게 방광에서 기원하기도 한다. 저자들은 방광에 생긴 평활근종의 초음파, CT, MRI 소견 1예를 경험하였기에 이를 보고하고자 한다. Leiomyomas are the most common benign tumors of the uterus, and although they can occur at any site in the genitourinary tract, they very rarely originate from the urinary bladder. We report a case in which a leiomyoma occurred at that site, deseribing the US, CT, and MRI findings.
현대정유 - 디지털시대의 최강자로 거듭나는 현대정유 오일뱅크
김성우,Kim, Seong-U 대한석유협회 2000 석유와 에너지 Vol.2000 No.5
석유협회보는 기간산업으로서 국가경제발전의 한 축을 이루고 있는 국내 정유회사들의 현재 추진사업과 21세기 사업방향을 소개하여 독자들의 정유회사에 대한 이해를 돕기 위해 회원사리뷰를 연재하고 있다.<편집자주>