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고분자 유기 EL 제조를 위한 멀티헤드형 잉크젯 패터닝 시스템
오제훈(Jehoon Oh),김시경(Sikyoung Kim),윤희열(Heeyoul Yoon),오세일(Seil Oh),강유명(Yoomyung Kang),김광일(Kwangil Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
According to the increase of lifetime and efficiency, the interest in the pLED has dramatically increased<br/> recently because pLED can be applied to large-size and flexible displays. The core process in the manufacture<br/> of pLED is the printing process of red, green and blue light emitting polymers (LEP), and inkjet printing<br/> method is one of the promising technology to print red, green and blue LEP on glass substrates. In this work,<br/> we developed a multi-head inkjet patterning system with 3 heads for each color. The developed inkjet<br/> patterning system is composed of the precise positioning system, head controller circuit, real-time ink drop<br/> evaluation system, maintenance system, and stable ink supply system. Finally, we investigated the stability<br/> and reliability of the system by printing red, green and blue LEP on the dummy substrate.
환자 맞춤형 대뇌동맥륜의 형상 조건에 따른 혈류역학 인자 분석
홍인의(Ineui Hong),오제훈(JeHoon Oh) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The Circle of Willis (CoW) is responsible for supplying blood form the heart to the cerebral arterioles and capillaries. Since CoW has a ring-like shape, three inlets (left & right internal carotid artery and basilar artery) and several outlets (middle cerebral artery, anterior communicating artery and posterior cerebral artery), it is difficult to analyze blood circulation and hemodynamics factors in blood vessels with an invasive method. To overcome difficulty, the computational fluid dynamics (CFD) is used for hemodynamics analysis. To analyze hemodynamics parameters, previous studies don’t consider the shape of CoW, but only the disease occurrence or the region of interest (RoI). In this study, Using CoW model and RoI model, comparing hemodynamics factors such as 3D streamline, wall shear stress and pressure according to models.