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김영신(Yeongsin Kim),배동호(Dongho Bae),박근수(Keunsoo Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Stainless steel sheets are widely used as the structural material for the railroad cars and the commercial vehicles. These kinds structures used stainless steel sheets are commonly fabricated by using the gas welding. for fatigue design of gas welded joints such as fillet and plug type joint, it is necessary to obtain design information on stress distribution at weldment as well as fatigue strength of gas welded joints. And also, the influence of the geometrical parameters of gas welded joints on stress distribution and fatigue strength must be evaluated. Therefore. in order to establish a reasonable and systematic fatigue design criterion for the long life design of the fillet welded body structure. in this study, stress distribution around the fillet welded joints subjected to tensile load was numerically analyzed. Also. the △P-Nf curves were obtained by fatigue tests. Using these results, △P-Nf curves were rearranged in the △δ-Nf relation with the hot spot stress at the fillet welded joint.
박유란 ( Yu Ran Park ),( Shin Wha Lee ),( Yeongsin Kim ),( In Young Bae ),( Hong-kyu Kim ),( Jaewon Choe ),( Yong-man Kim ) 대한산부인과학회 2020 대한산부인과학회 학술대회 Vol.106 No.-
Objective: To assess the clinical usefulness and diagnostic accuracy of ultrasonographic measurement of endometrial thickness (ET) in women with endometrial hyperplasia or cancer (EH+). Methods: This retrospective cohort study included 29,995 consecutive women who underwent transvaginal ultrasonography (TVS) for an incidental finding of a thickened endometrium at the health screening and promotion center at Asan Medical Center between 2006 and 2010. Among 959 patients with endometrial abnormalities, 92 patients were included in this study. A total of 867 patients were excluded: 416 were lost to follow-up; 263 did not undergo endometrial biopsy; 155 had endometrial polyps; 17 had submucosal myomas; and 16 had insufficient tissue samples. Endometrial histology was the reference standard for calculating accuracy. Results: Of the 92 patients, 78 (84.8%) had normal pathology, while 14 (15.2%) had endometrial pathology (EH+), including 5 patients (35.7%) with simple hyperplasia without atypia, 3 (21.4%) with complex hyperplasia, and 6 (42.9%) with endometrial carcinoma, all stage Ia. The area under the receiver-operating characteristic curve was 0.75 (95% confidence interval [CI], 0.593-0.906). The cut-off value for ET was 8 mm, indicating that TVS ET had a fair accuracy in diagnosing carcinoma, had a sensitivity of 100% (95% CI, 62.9-100.0%) and a specificity of 24.3% (95% CI, 15.2-36.3%). Conclusion: TVS is useful for detecting EH+, with a cut-off value for ET of 8 mm having a high sensitivity for detecting endometrial pathologies and the ability to identify women highly unlikely to have EH+, thereby avoiding more invasive endometrial biopsy.