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Seo Jun,Kim Hye-Won,Yu Ji Haeng,박희정 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.2
Various Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 –BaZr 0.65 Ce 0.20 Y 0.15 O 3 composites have been prepared for cathode materials for interme- diate-temperature solid oxide fuel cells. Their electrochemical properties on a barium–zirconium-cerate solid electrolyte have been investigated using 2-probe ac impedance measurement. Impedance spectra are measured to investigate their cathodic polarization resistances in cells in a symmetric confi guration. The Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 –BaZr 0.65 Ce 0.20 Y 0.15 O 3 composite fi red at 900 °C shows low polarization resistance of ~ 0.16 Ωcm 2 at 700 °C, which is an improved value over the Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 due to enhanced ionic conduction.
Seojun Park(박서준),Changhyeong Lee(이창형),Sungtek Kahng(강승택) 대한전기학회 2019 전기학회논문지 Vol.68 No.12
In this article, novel bandpass filters are proposed for compact sizes and frequency selection in 5G sub 6 GHz mobile systems. In view of shape, miniaturization and energy transfer, the core element of the filters is different from other resonators and filters, because it is a printed vertical split-ring and uses the magnetic field for coupling. This shortens the geometrical length remarkably compared to the length of well-known parallel edge-coupled filters and gap-coupled filters The filters are applied to the full 3 bands of 5G mobile sub-6-GHz. It is revealed that the total size of the filters is less than 0.25λ * 0.25λ, and it performs better than the conventional filter with the insertion loss about than 1 dB, S11 below than -15 dB in the passband, and high attenuation in stopbands.
전기자동차 주행거리 증대를 위한 고효율 공조 시스템 개발
윤서준(Seojun Yoon),강성호(Sungho Kang),김학규(Hakkyu Kim),김인혁(Inhyeok Kim) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
In electric vehicle, the driving range is significantly effect on the cooling and heating system according to the previous electric vehicle test results. Therefore, the focus on HVAC system for EV has to develop in order to decrease the power consumption. Eventually this ways will be contributed to increase the driving range and leads to satisfy customer. Heat pump system is essential to improve the driving range of heating system and occupied-zone HVAC system is efficiency system for solo driver. Also By adjusting to minimize the fresh air suction can decrease the heat load by increasing the recirculation air. These systems to save the power consumption were implemented for EV Vehicles and achieved the improvement of the driving range reduction rate.
옥서준(Seojun Ock),김민수(Minsu Kim),박수현(Suhyeon Park) 항공우주시스템공학회 2023 항공우주시스템공학회지 Vol.17 No.6
수소 가스터빈은 미래 항공 추진 기관과 무탄소 발전 동력원으로 이산화탄소 배출 문제에 대응할 수 있는 유망한 기술이다. 100% 수소를 연료로 사용하는 가스터빈을 위해서는 기존 탄화수소 연료와 다른 수소의 특성을 고려하여 효율과 안정성이 높은 혁신적인 연소기 시스템을 설계할 필요가 있다. 마이크로믹스는 연료와 공기를 강하게 혼합하여 반응이 빠르게 종료되도록 함으로써 질소산화물을 저감하고 안정성을 높이도록 하는 연소기 설계 방식이다. 본 논문에서는 수소 전소 기술로서 마이크로믹스 방식 연소기의 원리와 설계 방법을 살펴보고, 연구용 30 kW 마이크로믹스 수소 연소기 설계안을 소개한다. Hydrogen-fueled gas turbines are a promising technology that can resolve the carbon dioxide emission issue as future aviation propulsion engines and carbon-free power generations. To achieve high efficiency and stability of gas turbines using 100% hydrogen as fuel, an innovative design of combustor systems is necessary to consider the characteristics of hydrogen, which are different from those of conventional hydrocarbon fuels. Micromix is a combustor design method, which aims to terminate the reaction quickly by intense mixing of fuel and air, consequently reducing NOx and increasing the stability. In this paper, we examine the principles and design process of micromix combustors as a pure-hydrogen combustion technology, and we introduce a design of a 30 kW micromix hydrogen combustor for research.
Lee, Seojun,Cho, Jung Sang,Kang, Dong-Won Elsevier 2019 Ceramics international Vol.45 No.17
<P><B>Abstract</B></P> <P>In this study, polyethylene oxide (PEO) is introduced into methylammonium lead iodide (MAPbI<SUB>3</SUB>) perovskite to replace the standard anti-solvent washing process of perovskite solar cells. By forming PEO-MAPbI<SUB>3</SUB> composites, we achieved controllability of the perovskite surface morphology. Furthermore, the PEO addition improved the electronic properties of the composites by suppressing the trap density of the MAPbI<SUB>3</SUB> perovskite. We observed a significant increase in the average power conversion efficiency (PCE) of the perovskite solar cells (PVSCs) from 0.24% to 7.25% using the proper PEO-perovskite composition ratio (1.5:1), based on their fabrication without any organic anti-solvent treatment. Moreover, the performance uniformity and outdoor stability were significantly enhanced by employing the composite. The proposed PEO-perovskite composite offers a promising pathway for the industrialization of PVSCs in terms of PCE, uniformity, stability, and feasibility—without involving current anti-solvent washing process.</P>