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Facile aqueous-phase synthesis of Ag–Cu–Pt–Pd quadrometallic nanoparticles
유태경,김우식,방석호,Tae-Jin Lee,Sang Soo Han,Byung Chul Yeo,Zengmin Tang 나노기술연구협의회 2019 Nano Convergence Vol.6 No.38
Ag–Cu–Pt–Pd quadrometallic nanoparticles which small Pt and Pd nanoparticles were attached on the surface of AgCu Janus nanoparticles were firstly synthesized by sequential reduction of Pt and Pd precursor in the presence of Janus AgCu bimetallic nanoparticles as seeds in an aqueous solution. Even though there was a small amount of Cu2O on the surface, the synthesized nanoparticles were mainly composed of four independent metallic part, not alloy parts. By theoretical calculation and growth mechanism study, we found that different reducing rate between Ag+ and Cu2+ and sequential reduction of Pt and Pd precursors would be key roles for the formation of the quadrometallic nanoparticles.
유태경,조보현,송지우 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Generally, electrochemical catalysts based on Cu have shown good performance in CO<sup>2</sup> production. For better catalyst utilization, we synthesized the PdCu alloy nanocatalyst under mild conditions including an aqueous phase, relatively low reaction temperature, and air atmosphere. TEM and ICP analyses indicated that Pd/Cu atomic ratio and an average size of the synthesized PdCu alloy nanocatalysts were 85/15 and 3 nm, respectively. As a catalyst for the electrochemical CO2 reduction, the synthesized PdCu alloy nanocatalysts exhibited high Faradaic efficiencies (F.E.%) of 99.7% at 100 mA/cm2 and 97.2% at 200, respectively, demonstrated their high potential as an electrochemical catalyst.
3D 깊이우선 집적영상 디스플레이에서의 키넥트 센서를 이용한 컴퓨터적인 요소영상 생성방법
유태경,오용석,정신일,Ryu, Tae-Kyung,Oh, Yongseok,Jeong, Shin-Il 한국정보통신학회 2016 한국정보통신학회논문지 Vol.20 No.1
본 논문에서는 3D 깊이우선 집적영상(DPII) 디스플레이에서 키넥트(Kinect)를 이용하여 3D 물체에 대한 2D 요소영상들을 생성하는 방법을 제안한다. 먼저, 깊이우선 집적영상에서의 요소영상 생성원리를 기하광학적으로 분석하고 이 분석에 기초하여 키넥트의 RGB영상과 깊이영상으로부터 요소영상들을 생성한다. 3D 영상 복원을 위해서 집적영상에 기반한 컴퓨터적 시점재생 실험을 수행하고, 복원된 3D 영상에 대한 많은 시점영상들을 서로 비교한다. 제안하는 방식의 유용함을 보이기 위해서 기초적인 광학적 실험을 수행하였다. 그 결과, 제안하는 방식은 완전시차를 가지는 올바른 3D 영상을 제공함을 확인하였다. In this paper, we propose a generation of 2D elemental images for 3D objects using Kinect in 3D depth-priority integral imaging (DPII) display. First, we analyze a principle to pickup elemental images based on ray optics. Based on our analysis, elemental images are generated with both RGB image and depth image recorded from Kinect. We reconstruct 3D images from the elemental images with the computational integral imaging reconstruction technique and then compare various perspective images. To show the usefulness of the proposed method, we carried out the preliminary experiments. The experimental results reveal that our method can provide correct 3D images with full parallax.