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리튬/공기 이차전지용 카본미소구체/Fe<sub>3</sub>O<sub>4</sub> 나노복합체
박창성,박용준,Park, Chang Sung,Park, Yong Joon 한국전기화학회 2014 한국전기화학회지 Vol.17 No.2
본 논문에서는 리튬/공기 이차전지의 공기전극에 사용될 수 있는 카본미소구체/$Fe_3O_4$ 나노복합체의 합성과 전기화학적 특성에 대해 보고하고 있다. 산화물 촉매 중 하나인 $Fe_3O_4$의 부족한 전도성을 보완하기 위해 카본미소구체와 복합화를 시도하였고 그 결과 카본미소구체 표면에 수 nm 크기의 $Fe_3O_4$를 균일하게 분산시켜 복합화 할 수 있었다. 이와 같이 미세하게 분산된 산화물 촉매와 카본과의 결합은 촉매의 비표면적을 넓히고 카본과 촉매와의 접촉면을 넓혀 전도성을 높임으로서 높은 촉매 활성을 기대할 수 있다. 카본미소구체/$Fe_3O_4$ 나노복합체를 이용하여 만든 전극은 카본미소구체를 사용한 전극에 비해 낮은 과전압과 상대적으로 안정한 사이클 특성을 관찰할 수 있었다. In this article, we report the fabrication and characterization of carbon sphere/$Fe_3O_4$ nanocomposite for Li/air batteries. $Fe_3O_4$ nanoparticles are dispersed homogeneously on the surface of carbon spheres in an attempt to enhance the low conductivity of oxide catalyst ($Fe_3O_4$). The carbon sphere/$Fe_3O_4$ nanocomposite could offer wide surface area of $Fe_3O_4$ and increased carbon/catalyst contact area, which lead to enhanced catalytic activity. The electrode employing carbon sphere/$Fe_3O_4$ nanocomposite presented relatively low overpotential and stable cyclic performance compared with the electrode employing carbon sphere.
심실중 격손실 및 폐동맥 협착증을 동반한 완전 내장 전위증의 1 예
김성진 ( Sung Chin Kim ),윤홍진 ( Hong Chin Yun ),박창성 ( Chang Sung Park ),육순재 ( Soon Jae Yuk ),송창섭 ( Chang Sup Song ) 대한내과학회 1972 대한내과학회지 Vol.15 No.8
This report describes a 24 year old female patient who had complete situs inversus associated with cyanosis. The patient suffered from choledocholithiasis for 1 year and abdominal operation was. performed. A gall stone of 1.5×3.0cm in size was detected in
김성진 ( Sung Chin Kim ),윤홍진 ( Hong Chin Yun ),박창성 ( Chang Sung Park ),육순재 ( Soon Jae Yuk ),오정환 ( Chung Whan Oh ) 대한내과학회 1972 대한내과학회지 Vol.15 No.5
This report describes a 40 year old male patient of tophaceous gout with renal failure. Serum uric acid was found to be the range from 8. 3 to 9. 3mg/100ml. Mlultiple tophi were found on the both ears and about the metatarsophalangeal joints of the great t
1차원 Lumped 모델을 이용한 산업용 잉크젯 프린팅 헤드 토출 특성 해석
심원철(Won Chul Sim),박성준(Sung-Jun Park),김영재(Young Jae Kim),박창성(Chang Sung Park),유영석(Young Seuck Yoo),정재우(Jae Woo Joung),오용수(Yong Soo Oh) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.11
Jettability analysis using one-dimensional(1D) lumped parameter model has been investigated to design the industrial inkjet head with proper drop velocity and drop volume. By simplifying the inkjet head system into an equivalent electrical circuit, lumped model has been developed. Performance of the lumped model is verified by the comparison between measured results of droplet velocity and ejection volume and predicted value. Also, the jetting performance of an inkjet head is characterized by varying the design parameter and driving condition. As a result, simulation results shows good agreement with the experimentally measured value. The developed lumped model enables to easily understand the effect of dimension change and predict the jetting performance.