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Endovascular hemostasis for endoscopic procedure-related gastrointestinal bleeding
Minho Park,Jong Woo Kim,Ji Hoon Shin 소화기인터벤션의학회 2019 International journal of gastrointestinal interven Vol.8 No.3
Gastrointestinal (GI) bleeding is a common complication of various endoscopic procedures. In most cases, GI bleeding responds to conservative man-agement. And if indicated, endoscopic hemostasis is performed. However, if endoscopic hemostasis fails due to massive bleeding or hemodynami-cally unstable patients, alternative treatment options, such as endovascular hemostasis or surgery, should be considered. As endoscopic procedures have become more diverse, there have been reports of interventional treatment of endoscopic, procedure-related GI bleeding. In this article we will discuss the endovascular diagnosis and treatment of endoscopic, procedure-related GI bleeding.
Experimental study on dynamic buckling phenomena for supercavitating underwater vehicle
Minho Chung,Hee Jun Lee,Yeon Cheol Kang,Woo-Bin Lim,김정호,조진연,Wanil Byun,Seung Jo Kim,Sung-Han Park 대한조선학회 2012 International Journal of Naval Architecture and Oc Vol.4 No.3
Dynamic buckling, also known as parametric resonance, is one of the dynamic instability phenomena which may lead to catastrophic failure of structures. It occurs when compressive dynamic loading is applied to the structures. Therefore it is essential to establish a reliable procedure to test and evaluate the dynamic buckling behaviors of structures, especially when the structure is designed to be utilized in compressive dynamic loading environment, such as supercavitating underwater vehicle. In the line of thought, a dynamic buckling test system is designed in this work. Using the test system, dynamic buckling tests including beam, plate, and stiffened plate are carried out, and the dynamic buckling characteristics of considered structures are investigated experimentally as well as theoretically and numerically.
Endovascular hemostasis for endoscopic procedure-related gastrointestinal bleeding
Minho Park,Jong Woo Kim,Ji Hoon Shin 소화기인터벤션의학회 2019 Gastrointestinal Intervention Vol.8 No.3
Gastrointestinal (GI) bleeding is a common complication of various endoscopic procedures. In most cases, GI bleeding responds to conservative man-agement. And if indicated, endoscopic hemostasis is performed. However, if endoscopic hemostasis fails due to massive bleeding or hemodynami-cally unstable patients, alternative treatment options, such as endovascular hemostasis or surgery, should be considered. As endoscopic procedures have become more diverse, there have been reports of interventional treatment of endoscopic, procedure-related GI bleeding. In this article we will discuss the endovascular diagnosis and treatment of endoscopic, procedure-related GI bleeding.
Yang, MinHo,Hong, Seok Bok,Yoon, Jo Hee,Kim, Dong Seok,Jeong, Soon Woo,Yoo, Dong Eun,Lee, Tae Jae,Lee, Kyoung G.,Lee, Seok Jae,Choi, Bong Gill American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.34
<P>Highly ordered and flexible nanopillar arrays have received considerable interest for many applications of electrochemical devices because of their unique mechanical and structural properties. Here, we report on highly ordered polyoxometalate (POM)-doped polypyrrole (Ppy) nanopillar arrays produced by soft lithography and subsequent electrodeposition. As-prepared POM-Ppy/nanopillar films show superior electrochemical performances for pseudocapacitor and enzymeless electrochemical sensor applications and good mechanical properties, which allowed them to be easily bent and twisted. Regarding electrochemical characteristics for pseudocapacitive electrodes, the POM-Ppy/nanopillar electrodes are capable of delivering high areal capacitance of 77.0 mF cm(-2), high rate performance, and good cycle life of similar to 100% retention over 3500 cycles even when bent. Moreover, the study suggests that the POM-Ppy/nanopillar electrodes have an excellent electrocatalytic activity toward hydrogen.</P>
Chang Woo Lee,Seongyong Kim,Minho Jo,이종수 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.8 No.3
Flexible copper clad laminate has been used to fabricate flexible electronics such as bio-inspired tactile sensor, microfluidics-based sensor, and flexible printed circuits board. Herein, the effects of thermal property difference between the component layers on the residual interfacial deformation in a flexible copper clad laminate occurring during roll-to-roll composite film manufacturing were analyzed. The thermal behaviors of polyimide film and copper meshes in the laminate were examined, and it was found that differences of the coefficient of thermal expansion and elastic modulus between the two components could cause the residual deformation in the laminate. The three factors affecting the residual strain due to the thermal characteristic difference, i.e., temperature and pressure of the lamination roll and web tension, were selected in the controllable operating conditions in a roll-to-roll lamination process. Mathematical models to estimate the elastic and thermal residual strains according to the factors were developed and experimentally verified. Finally, the effects of the three factors on the residual strain in the laminate were determined using the developed model. In this study, we demonstrate that, in the lamination process, the thermal strain of the laminate component materials after thermal cycling generates a significant residual deformation, which causes defects in the flexible copper clad laminate. The developed model can be used to accurately estimate the residual elastic and thermal residual strains occurring during the roll-to-roll manufacturing according to the process conditions.