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심재준,이성욱,한동섭,김태형,이상석,한근조 東亞大學校 大學院 2005 大學院論文集 Vol.30 No.-
MEMS structures generally have been fabricated using surface-machining method, but the interface failure between silicon substrate and evaporated thin film frequently was taken place due to the residual stress induced by the fluctuated thermal loads. Therefore this paper studied the residual stress caused the thermal loads in the thin film and introduce the simple method to measure the trend of the residual stress by the indentation. Specimens were made from varialde materials such as Al, Au and Cu and thermal load was applied repeatedly. The residual stress was measured by Finite Element Analysis and the existence of the residual stress due to thermal load was verified by the experimental results. The indentation length of the thermal loaded specimens increased maximum 15% comparing with the virgin thin film caused by tensile residual stress. The finite element analysis results are similar to indentation test.
Usefulness of Endoscopic Ultrasound in Esophagogastric Varices
심재준 대한소화기내시경학회 2012 Clinical Endoscopy Vol.45 No.3
Endoscopic ultrasound (EUS) is a useful diagnostic tool for evaluation of esophagogastric varices and guidance of endoscopic therapy. EUS can visualize not only collateral veins around the esophagus but also perforating veins that connect esophageal varices with collateral veins. They are associated with high risk of bleeding and early recurrence after initial variceal eradication. Isolated gastric varices can be easily diagnosed using EUS that mimic thickened gastric folds or subepithelial tumors. EUS-guided endoscopic therapy is a challenging field of variceal bleeding. It has a potential role for assistance of interventions and evaluation of treatment outcome.