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Hun-Gi Jung(정훈기),Yang-Kook Sun(선양국) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In this work a lithium-ion battery based on the combination of a Li₄Ti<SUB>5</SUB>O₁₂(LTO) negative electrode with a Li[Ni<SUB>0.45</SUB>Co<SUB>0.1</SUB>Mn<SUB>1.45</SUB>]O₄ positive electrode is reported. Although possibly based on a not totally new concept, the battery offers performances in terms of rate, life and temperature to our knowledge never met before by competitive systems. Indeed, we show that the LTO/LNMO battery can be cycled at rates as high as 10 C with minor decays in capacity, has a life unusually long, i.e., exceeding 500 cycles at 1 C rate and may operate over a wide temperature range, i.e., from -20 ℃ to 55 ℃, with no substantial loss in cycling stability. The energy density is estimated to be of the order of 225 Wh kg?¹ and of 540 Wh l<SUP>-1</SUP>, values considerably higher than those delivered by the presently available Li-ion batteries.
헬기 생존계통 센서 운용 환경 하에서의 데이터 융합 알고리즘에 관한 연구
박영선,김화수,김숙경,우상민,정훈기,Park, Young-Sun,Kim, Hwa-Soo,Kim, Sook-Gyeong,Wu, Sang-Min,Jung, Hun-Gi 한국국방경영분석학회 2008 한국국방경영분석학회지 Vol.34 No.3
The purpose of this paper is to design an algorithm for data fusion of sensors data in the helicopter ASE system, using Bayesian Network, which was selected among several knowledge base data fusion methods after consideration and applied to this study. The result of the algorithm analysis shows that Bayesian Network is effective method for solving this problem. 본 논문은 최근 개발되는 헬기의 생존성 보장을 위하여 장착되는 센서체계에서 상호 독립적으로 수집된 센서 데이터의 융합 알고리즘 개발을 위하여 다양한 지식 기반의 데이터 융합 기법 등을 검토하였다. 이 논문에서는 다양한 데이터 융합기법 중에서 헬기 생존 계통 센서 체계의 데이터 응함에 유효한 대안이 될 수 있는 Bayesian Network를 이용한 지식 기반의 데이터 융합 기법 알고리즘을 설계하고 구현하였다.
임진혁(Jinhyuk Lim),정화영(Hwa Young Jung),정훈기(Hun-Gi Jung),지호일(Ho-Il Ji),이종호(Jong-Ho Lee) 한국세라믹학회 2018 세라미스트 Vol.21 No.4
The optimal fabrication conditions for Gd 0.1 Ce 0.9 O 2-δ (GDC) buffer layer and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) cathode on 1mol% CeO 2 –10mol% Sc 2 O 3 stabilized ZrO 2 (CeScSZ) electrolyte were investigated for application of IT-SOFCs. GDC buffer layer was used in order to prevent undesired chemical reactions between LSCF and CeScSZ. These experiments were carried out with 5 x 5cm 2 anode supported unit cells to investigate the tendencies of electrochemical performance, Microstructure development and interface reaction between LSCF/GDC/CeScSZ along with the variations of GDC buffer layer thickness, sintering temperatures of GDC and LSCF were checked, respectively. Electrochemical performance was analyzed by DC current-voltage measurement and AC impedance spectroscopy. Microstructure and interface reaction were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Although the interfacial reaction between these materials could not be perfectly inhibited, We found that the cell, in which 6μm GDC interlayer sintered at 1200℃ and LSCF sintered at 1000℃ were applied, showed good interfacial adhesions and effective suppression of Sr, thereby resulting in fairly good performance with power density of 0.71W/cm 2 at 800℃ and 0.7V.