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윤진식,박욱 한국바이오칩학회 2020 BioChip Journal Vol.14 No.3
The 3D printing apparatus in conventional inkjet and stereolithography systems is limited to continuous fabrication of a microsized three-dimensional hydrogel composed of multiple substances. We present a micro three-dimensional printing system by combining a polydimethylsiloxane microfluidic channel through which various fluids can flow into a micro two-dimensional particle generation system, and a single-axis stepper motor to control the thickness of each layer. The optimal channel designs for micro three-dimensional printing were set up through a physics simulation program and using the simulation analysis, the optimal microfluidic channel was fabricated. Through the system and channel, three-dimensional micropatterns and particles could be fabricated and the generated microparticles automatically collected by the washing flow in the channel. Zinc oxide nanoparticle materials transparent, biocompatible, and capable of absorbing ultraviolet light were added to the premixed photocurable solution used for the microparticle production, and thereby precise micro threedimensional patterns and particles could be fabricated. In addition, by transporting a variety of fluids into the microfluidic channel, it was possible to create micro three-dimensional particles composed of heterogeneous materials.
놀이적 접근을 통한 선 그리기 활동방법에 대한 고찰 - 전도식기 유아를 중심으로 -
윤진식 한국아동미술학회 2014 아동미술교육 Vol.13 No.-
유아미술교육에서 선이란 그림그리기의 기초가 되면서 동시에 자신의 생각이나 느낌을 창의 적으로 나타낼 수 있는 중요한 요소이며 표현활동의 기초가 된다. 따라서 선을 이해하고 효 과적으로 사용한다면 표현활동에 있어서 주제를 부각시키고 표현능력을 신장시키는 것은 물 론 창의적 표현활동을 할 수 있는 밑거름이 된다. 하지만 이러한 선을 활용하는 그리기의 능 력은 유아기의 어린이들에게는 발달을 고려하여 즐겁게 자기표현을 할 수 있도록 하는 환경 이 필요 하다. 여러 가지 제한된 환경에서 유아들을 위한 선 그리기를 위한 교수-학습의 환 경에 최적으로 다가가는 데에는 문제가 있음을 알 수 있다. 유아미술교육의 현장에서 현재에 도 부모들에게 보이기 위한 자료를 위한 획일적이고 지시적인 내용의 활동으로 접근하는 것 이 비일 비재하다. 따라서 유아들의 발달수준의 고려와 흥미를 제공하지 못하는 즉, 동기 유 발이 되지 못하는 선 그리기의 활동에 대하여 환기 할 필요가 있다고 보았다. 이점을 인식하 며 유아들의 사물표현의 첫 상징을 나타내는 전도식기(4∼7세)의 유아들을 대상으로 그리기 특성을 이해하고, 이를 뒷받침 할 수 있는 교수전략과 지도안을 제시하여 그 시기의 유아들 이 하여금 선 그리기에 자신감을 가지고 즐겁게 다가 갈 수 있도록 지도방안을 고찰 해 보았다. The line is the product of drawing and it's also the important factor and the basis of expression activity in expressing one's thought or feeling initiatively in art instruction for him. So if one knows line and uses it effectively,one can tell the theme,increase expressing ability and form the basis of initiative expression activity. But such drawing with a line for infants needs the environment in which they express themselves delightfully considering their developmental stages. Restricted environment disturbs the best instruction and study one for infants' drawing. Nowadays in the scene of infant art instruction there are many uniform and directive activities as the data for the purpose of showing them to their parents. So drawing activity without considering infants' development stage and interesting them in other words that without motivating them has to be considered. And this study is about instruction method that makes the infants of the preschematic stage in which they express objects first be delightful with self-confidence on drawing understanding the character on their drawing and then presenting the instruction method and teaching plan for it.
윤진식,Soo Kim,조병원,이관영,정경윤,장원영 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.2
Carbon-coated Li3V2(PO4)3-LiMnPO4 composite cathode materials are first reported in this work, prepared by the mechanochemical process with a complex metal oxide as the precursor and sucrose as the carbon source. X-ray diffraction pattern of the composite material indicates that both olivine LiMnPO4 and monoclinic Li3V2(PO4)3 co-exist. We further investigated the electrochemical properties of our Li3V2(PO4)3-LiMnPO4 composite cathode materials using galvanostatic charging/discharging tests, where our Li3V2(PO4)3-LiMnPO4 composite electrode materials exhibit the charge/discharge efficiency of 91.9%, while Li3V2(PO4)3 and LiMnPO4 exhibit the efficiency of 87.7 and 86.7% in the first cycle. The composites display unique electrochemical performances in terms of overvoltage and cycle stability, displaying a reduced gap of 141.6 mV between charge and discharge voltage and 95.0% capacity efficiency after 15th cycles.
원전용 실시간 이더넷을 위한 분산제어망의 마스터 이중화 기법
윤진식(Jin-Sik Yun),김윤섭(Yun-Seop Kim),김동성(Dong-Sung Kim) 대한전기학회 2010 정보 및 제어 심포지엄 논문집 Vol.2010 No.10
This paper proposes a reliability enhancement of industrial real-time Ethernet using master redundancy method for NPPs(Nuclear Power Plants). In this paper, Ethernet Powerlink is investigated for distributed control systems for NPPs considering real-time and reliability performance. The proposed method can reduce a master switch-over time when Ethernet Powerlink master(Managing Node) failure was occurred. Using the OPNET simulation result, the performance of master switch-over time is analyzed and verified for NPPs.