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백점기,이탁기,손영길 釜山大學校生産技術硏究所 1995 生産技術硏究所論文集 Vol.49 No.-
본 연구의 목적은 좌초시 선저부의 찢김 응답에 대한 치수 및 동적 효과를 고찰하는 것이다. 이를 위해 판 및 종방향 보강재를 가진 보강판에 대해 판두께를 변화시킨 찢김 시리즈 실험을 수행하였으며, 본 실험 결과뿐 아니라 타연구자에 의해 수행된 기존의 찢김 실험 결과를 바탕으로 판의 찢김 응답에 대한 판두께의 치수 효과를 분석하였다. 또한, 기존의 이론적 및 실험적 연구 성과를 바탕으로 판의 찢김 응답에 대한 동적 효과를 고찰하였다. 특히, 연강재뿐 아니라 고장력강재의 항복강도에 대한 변형속도 효과를 정량적으로 규명하였다. The aim of the present study is to investigate the scaling and dynamic effects on the plate cutting response. A series of cutting tests for unstiffened and longitudinally stiffened steel plate specimens were in a quasi-static condition carried out, varying the plate thickness. Based on the previous as well as the present test results, the scaling effect of plate thickness on the cutting response is investigated. Dynamic effects are also clarified from the previous theoretical and experimental results. The Cowper-Symonds constitutive equation originally derived for mild steel is modified to consider the influence of strain-rate sensitivity on yield strength of high tensile steel.
손영길(Young Gil Son),류승완(Seung Wan Ryu),김인호(In Ho Kim),손수상(Soo Sang Sohn),강유나(Yu Na Kang) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.76 No.6
Purpose: Lymph node metastasis is an important prognostic factor in patients with early gastric cancer. Therefore, we analyzed the predictive factors for lymph node metastasis in submucosal gastric cancer and explored the feasibility of minimally invasive surgery. Methods: The clinicopathological features of 317 patients with submucosal gastric cancer, who underwent radical gastrectomy with lymph node dissection at Department of Surgery, Keimyung University School of Medicine from January 2003 to December 2007, were examined retrospectively. The lesions were divided into 3 layers according to the depth of submucosal invasion of the cancer cell (SM1, SM2, and SM3). We analyzed the clinicopathological variables regarding lymph node metastasis. Results: Of the 317 patients, 74 patients (23.3%) had lymph node metastasis. Tumor size, histological type, Lauren classification, depth of invasion, lymphatic invasion, vascular invasion, and perineural invasion showed a positive correlation with lymph node metastasis by univariate analysis. In multivariate analysis, tumor size (≥4 cm vs <2 cm, P=0.034 and 2∼4 cm vs <2 cm, P=0.043), histological type (P=0.013), and lymphatic invasion (P=0.000) were significantly correlated with lymph node metastasis. Conclusion: Tumor size, histological type, and lymphatic invasion were independent risk factors for lymph node metastasis in submucosal gastric cancer. Minimally invasive surgery, such as endoscopic submucosal dissection may be applied to submucosal gastric cancer with a tumor size less than 2 cm, differentiated histological type, and no lymphatic invasion.