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나노 구조물 형성을 통한 NiTi 형상기억합금 표면 개질 기법 개발
송경환(Kyounghwan Song),민태기(Taegee Min),남영석(Youngsuk Nam) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
NiTi is a popular shape memory alloy for vascular devices including guide wires, stents, and valves. In this work, we investigated surface nanostructuring techniques for NiTi to reduce the slip resistance and to improve anti-corrosion and anti-thrombosis resistance of surfaces. We applied new chemical oxidation schemes that enable us to control the characteristics of NiTi surfaces with a simple and quick wet-chemical processes. The effects of such modifications on the surface morphology and chemistry were investigated by SEM, EDS techniques and the resulting dynamic contact angles were characterized by high-precision goniometer.The anti-corrosion resistance was compared by measuring the breakdown voltage and the anti-thrombosis resistance was estimated by platelet rich plasma (PRP) adhesion tests. The suggested oxidation scheme creates a stable titanium oxide layer within 5 min that provides 960 mV and 94.4% reduction of PRP adhesion for 60 min.
민태기(Taegee Min),장세명(Se-Myong Chang) 한국추진공학회 2018 한국추진공학회 학술대회논문집 Vol.2018 No.12
무인 항공기의 개발에 있어, 전기 모터는 동력의 제한에도 불구하고 주된 추진 기관이 되어 왔으며, 최근 회전익 형태의 드론에서도 여전히 사용되고 있다. 그러나 지금까지 전자 장치에 널리 사용되는 리튬 이온이나 리튬 폴리머와 같은 배터리의 한계는 잘 고려되지 않고 있다. 본 논문에서는 회전익 드론에 적용되는 배터리의 타당성을 특히 동력 및 원반 하중에 대한 토의와 함께 연구하였다. In the development of UAV, the electric motor has been a primary propulsive device in spite of its limitation in power, which is recently used for rotary-wing type drones, too. However, the limitation of batteries is not well considered so far such as lithium-ion and lithium-polymer that are widely used for electronic devices. In this paper, we studied the feasibility of battery for the application of a rotary-wing drone especially with some discussion of power and disk loading critique.