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Lee, Chanmin,Jeon, Yukwon,Kim, Taehyen,Tou, Akihiro,Park, Joo-Il,Einaga, Hisahiro,Shul, Yong-Gun Elsevier 2018 Fuel Vol.212 No.-
<P><B>Abstract</B></P> <P>The catalytic combustion of soot and CO is one of the key technologies required to meet rigorous emission standards. Recently, solid solution materials have been employed in heterogeneous catalysts because of their remarkable intrinsic activities and good stabilities. However, the low number of contact points between soot particles and the catalyst remains a challenge to enhancing catalytic performance. Thus, we herein report the preparation of Ce-ZrO<SUB>2</SUB> solid solution nano-fibrous web catalysts with a hierarchical structure using an electrospinning method, where Ag particles were loaded onto the surface of the Ce-ZrO<SUB>2</SUB> webs. X-ray diffraction, scanning transmission electron microscopy, and energy dispersive spectroscopic studies allowed us to investigate the morphological and crystal structures of the prepared Ce-ZrO<SUB>2</SUB> and Ag/Ce-ZrO<SUB>2</SUB> web catalysts. Moreover, the relationship between the Ce/Zr ratio and activated oxygen is discussed based on X-ray photoelectron spectroscopy results. Following the catalytic oxidation of soot and CO using our novel materials, we found that the Ce<SUB>0.67</SUB>Zr<SUB>0.33</SUB>O<SUB>2</SUB> web exhibited higher catalytic activities than the Ce<SUB>0.5</SUB>Zr<SUB>0.5</SUB>O<SUB>2</SUB> and Ce<SUB>0.33</SUB>Zr<SUB>0.67</SUB>O<SUB>2</SUB> webs, respectively. In addition, Ag/Ce<SUB>0.67</SUB>Zr<SUB>0.33</SUB>O<SUB>2</SUB> exhibited enhanced catalytic activity compared with the pristine Ce<SUB>0.67</SUB>Zr<SUB>0.33</SUB>O<SUB>2</SUB> for the oxidation of both soot (e.g., 500°C vs. 544°C at 50% conversion) and CO (e.g., 282°C vs. 408°C at 50% conversion). It therefore appeared that our proposed Ce-ZrO<SUB>2</SUB> solid solution nano-fibrous web catalysts bearing Ag particles exhibited superior redox properties and enhanced surface areas, and as such, are promising candidates for use in the oxidation of both soot and CO.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ce-ZrO<SUB>2</SUB> solid-solution oxide fibrous webs were synthesized by electrospinning. </LI> <LI> Ag particles were deposited to improve catalytic activity. </LI> <LI> Ag/Ce<SUB>0.67</SUB>Zr<SUB>0.33</SUB>O<SUB>2</SUB> exhibited superior catalytic activity to other sample. </LI> <LI> Redox property of Ag and enhanced surface areas improved the catalytic oxidation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Chanmin,Park, Jeongho,Jeon, Yukwon,Park, Joo-Il,Einaga, Hisahiro,Truong, Yen B.,Kyratzis, Illias L.,Mochida, Isao,Choi, Jonghyun,Shul, Yong-Gun American Chemical Society 2017 Energy & fuels Vol.31 No.7
<P>An Aquivion/titanium zirconium oxide nanofibrous web composite membrane was prepared and tested as a proton exchange membrane in a hydrogen/air fuel cell. The incorporation of a small dose (9 wt % membrane) of a uniformly distributed electrospun titanium zirconium oxide (TiO2/ZrO2; Ti/Zr = 1:1 atomic ratio) nanofibrous web significantly improved hydromechanical stability of the composite membranes, which exhibited approximately 2 times higher water retention and 30 times lower dimensional change than a pristine Aquivion membrane under in-water membrane hydration conditions. Phosphate functionalities were successfully added onto the nanofiber surface, as confirmed by X-ray photoelectron spectroscopy (XPS) analysis. The added phosphate functionality resulted in higher proton conductivity of the prepared composite membrane compared to the non-modified TiO2/ZrO2 nanofibrous web composite membrane [e.g., 0.027 S cm(-1) versus 0.021 S cm(-1) at 120 degrees C and 40% relative humidity (RH)]. A single cell test also showed the effect of an added TiO2/ZrO2 nanofibrous web. A single cell with an Aquivion/TiO2/ZrO2 nanofibrous web composite membrane outperformed a single cell with a pristine Aquivion membrane in fully humidified conditions (100% RH at 75 and 90 degrees C). The Aquivion/phosphate-modified TiO2/ZrO2 nanofibrous web composite membrane showed the best single cell performance at all four testing conditions, including the fully humidified medium-temperature conditions (e.g., P-max = 1.18 W cm(-2) at 75 degrees C and 100% RH, and P-max = 0.97 W cm(-2) at 90 degrees C and 100% RH) and partially humidified high-temperature conditions (P-max = 0.45 W cm(-2) at 120 degrees C and 40% RH, and P-max = 0.21 W cm(-2) at 140 degrees C and 20% RH). The composite membrane also displayed excellent durability evidenced by the accelerated lifetime (ALT) test results. Overall, the phosphate-modified TiO2/ZrO2 nanofibrous web composite membrane enhanced the electrical properties and durability of the fuel cell, especially at high temperatures (>120 degrees C).</P>
IoT 기술을 활용한 스마트 쇼핑 도우미 구현에 관한 연구
고찬민,이정수,이윤수,이동엽,이진희,강병권 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.1
In this paper, we propose ‘Smart Shopping Cart’ based on Arduino system. We used the ‘Mega Board’ in Arduino series because this cart system use various sensors and devices. The proposed system can contribute to solve social problems, especially demographic cliff and aging society, and can be considered as a solution for decrease in consumption at aging society. The software part of the system was made in the Arduino source format and the APP Inventor algorithm. Also we used bluethooth module for communication with users who want to know intuitive information from the cart.
Lee, Chanmin,Shul, Yong-Gun,Einaga, Hisahiro Elsevier 2017 CATALYSIS TODAY - Vol.281 No.3
<P><B>Abstract</B></P> <P>Mesoporous zirconia (ZrO<SUB>2</SUB>) nanofibers were synthesized by an electrospinning method and calcination at 600°C. Ag and Mn oxides were separately or simultaneously deposited on the ZrO<SUB>2</SUB> nanofibers by impregnation methods. The structure of the ZrO<SUB>2</SUB> supported nanofiber materials were examined by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). Ag and Mn oxides were homogeneously deposited on the surface of ZrO<SUB>2</SUB> nanofibers. Metallic Ag species and Mn<SUB>2</SUB>O<SUB>3</SUB> were formed on the ZrO<SUB>2</SUB> nanofibers when they were separately deposited, whereas the codeposition of Ag and Mn changed the oxidation state of Mn oxides on the catalyst surface. The supported catalysts were evaluated for their soot and benzene oxidation performance. The co-deposition of Ag and Mn lowered the light-off temperature for benzene oxidation. The soot oxidation performance was comparable for the Ag/ZrO<SUB>2</SUB>, Mn/ZrO<SUB>2</SUB> and Ag-Mn/ZrO<SUB>2</SUB> catalysts under tight contact mode, whereas Ag/ZrO<SUB>2</SUB> exhibited the highest activity and the activity decreased with decreasing the Ag content under loose contact mode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mesoporous zirconia nanofibers can be synthesized by electrospinning. </LI> <LI> Ag and Mn oxide particles can be deposited on ZrO<SUB>2</SUB> and used for catalytic oxidation. </LI> <LI> Codeposition of Ag and Mn oxides improves benzene oxidation activity. </LI> <LI> Soot oxidation performance is related to the amount of Ag loaded. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Chanmin,Na, Heesoo,Jeon, Yukwon,Jung Hwang, Ho,Kim, Hyun-Jong,Mochida, Isao,Yoon, Seong-Ho,Park, Joo-Il,Shul, Yong-Gun Elsevier 2019 Journal of industrial and engineering chemistry Vol.74 No.-
<P><B>Abstract</B></P> <P>Poly(ether imide) (PEI) membranes for polymer electrolyte membrane fuel cells (PEMFCs) are prepared by the electrospinning method. This approach produces a membrane with a high porosity and surface area that is suitable for accommodating proton-conducting materials. A composite membrane was prepared by impregnating the pores of the electrospun PEI membrane with Aquivion ionomer. Then, an inorganic proton conductor in the form of SiO<SUB>2</SUB>/heteropolyacid (HPA) nanoparticles was prepared by a microemulsion process and the particles added to the Aquivion ionomer. The membranes were characterized by field emission scanning electron microscopy (FE-SEM) and single-cell performance testing for PEMFC. The durability of the composite membrane was assessed via accelerated lifetime and on/off tests.</P> <P>The ionomer-impregnated electrospun PEI membrane showed good thermal stability, satisfactory mechanical properties, and high proton conductivity. The addition of the SiO<SUB>2</SUB>/HPA nanoparticles improved the proton conductivity of the composite membrane, thereby allowing the operating temperature in low humidity environments to be extended. The composite membrane exhibited promising properties for application in high-temperature PEMFCs.</P>
Park, Hyeong Cheol,Lee, Shinyoung,Park, Bokyung,Choi, Wonkyun,Kim, Chanmin,Lee, Sanghun,Chung, Woo Sik,Lee, Sang Yeol,Sabir, Jamal,Bressan, Ray A.,Bohnert, Hans J.,Mengiste, Tesfaye,Yun, Dae-Jin Korean Society for Molecular and Cellular Biology 2015 Molecules and cells Vol.38 No.1
In the interaction between plants and pathogens, carbon (C) resources provide energy and C skeletons to maintain, among many functions, the plant immune system. However, variations in C availability on pathogen associated molecular pattern (PAMP) triggered immunity (PTI) have not been systematically examined. Here, three types of starch mutants with enhanced susceptibility to Pseudomonas syringae pv. tomato DC3000 hrcC were examined for PTI. In a dark period-dependent manner, the mutants showed compromised induction of a PTI marker, and callose accumulation in response to the bacterial PAMP flagellin, flg22. In combination with weakened PTI responses in wild type by inhibition of the TCA cycle, the experiments determined the necessity of C-derived energy in establishing PTI. Global gene expression analyses identified flg22 responsive genes displaying C supply-dependent patterns. Nutrient recycling-related genes were regulated similarly by C-limitation and flg22, indicating re-arrangements of expression programs to redirect resources that establish or strengthen PTI. Ethylene and NAC transcription factors appear to play roles in these processes. Under C-limitation, PTI appears compromised based on suppression of genes required for continued biosynthetic capacity and defenses through flg22. Our results provide a foundation for the intuitive perception of the interplay between plant nutrition status and pathogen defense.
육계사의 차열페인트 및 히트펌프 적용에 따른 온도 감소 평가
문준섭 ( Seung-hun Lee ),김락우 ( Rack-woo Kim ),이승기 ( Seung-kee Lee ),김웅 ( Woong Kim ),한재웅 ( Jae-woong Han ),이승헌 ( Wooju Kim ),김우주 ( Junseop Mun ),김찬민 ( Chanmin Kim ),석희웅 ( Heewoong Seok ),안수빈 ( Subeen Ahn 한국농공학회 2022 한국농공학회 학술대회초록집 Vol.2022 No.-
최근 전 세계적으로 지구온난화 및 기후변화의 영향으로 폭염의 빈도와 강도가 증가하고 있다. 국내의 경우 지난 46년간(1973∼2019년), 일최고기온 극값은 1.5℃, 평균 폭염일수는 7.4일이 증가하였으며 2018년에는 기상 관측 이래 최고기온 경신 및 최다 폭염일이 발생하였다. 폭염은 가축에게 고온 스트레스를 유발하며 가축의 면역력 감소와 질병발생을 초래하여 폐사율을 증가시키고 생산성을 저해한다. 특히 국내 축산업 역시 증가하는 폭염으로 가축의 고온피해가 지속적으로 발생하고 있다. 특히 닭은 높은 대사율과 체온이 40℃를 넘는 온혈동물이며 온몸이 깃털로 덮여있고 땀샘이 발달하지 않아 체온발산이 어려워 타 축종에 비해 고온에 취약하다. 또한 닭고기의 소비량이 급격하게 증가함에 따라 생산효율의 증대를 위해 면적당 사육 밀도가 증가하여 닭이 고온 피해에 더욱 직접적으로 노출되고 있다. 이에 현재 계사에는 닭의 고온 피해 예방을 위한 냉방 시스템이 반드시 필요한 상황이다. 그러나 국내 계사에서 일반적으로 사용하고 있는 냉방 시스템은 팬을 이용한 강제환기방식이 대부분이며 쿨링패드, 안개분무 장치, 지하수 지붕 살수 등의 관행의 냉방시설은 외부 환경에 영향을 많이 받아 시설 내부 온도를 감소시키는데 한계가 존재한다. 이에 본연구에서는 계사 냉방시설 개발을 위해 무창계사에 차열페인트와 가스+전기 히트펌프를 설치한후 환기량 변화에 따른 온도 감소 효과를 분석하고자 하였다. 이를 위하여 계사 내부, 외부 온도를 측정하였고 히트펌프 가동 및 환기량, 운영조건에 따른 온도 감소 효과를 평가하였다. 평가 결과 차열페인트 적용으로 계사 내부 온도가 약 1℃ ~ 2℃ 감소하였으며 히트펌프 가동시 환기량을 낮게 설정할수록 온도 감소 효과가 더욱 큰 것으로 나타났다. 본 연구에서 진행한 실험결과를 바탕으로 하절기 계사의 적정 운영 방안 제시에 활용될 수 있을것으로 판단된다.