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Mansu Kim,민남기,Sun Jin Yun,Hyun Woo Lee,Alexander M. Efremov,권광호 한국전자통신연구원 2008 ETRI Journal Vol.30 No.3
The etching mechanism of ZrO2 thin films and etch selectivity over some materials in both BCl3/Ar and BCl3/CHF3/Ar plasmas are investigated using a combination of experimental and modeling methods. To obtain the data on plasma composition and fluxes of active species, global (0-dimensional) plasma models are developed with Langmuir probe diagnostics data. In BCl3/Ar plasma, changes in gas mixing ratio result in nonlinear changes of both densities and fluxes for Cl, BCl2, and BCl2 +. In this work, it is shown that the nonmonotonic behavior of the ZrO2 etch rate as a function of the BCl3/Ar mixing ratio could be related to the ionassisted etch mechanism and the ion-flux-limited etch regime. The addition of up to 33% CHF3 to the BCl3-rich BCl3/Ar plasma does not influence the ZrO2 etch rate, but it non-monotonically changes the etch rates of both Si and SiO2. The last effect can probably be associated with the corresponding behavior of the F atom density.
Effects of anode flooding on the performance degradation of polymer electrolyte membrane fuel cells
Kim, Mansu,Jung, Namgee,Eom, KwangSup,Yoo, Sung Jong,Kim, Jin Young,Jang, Jong Hyun,Kim, Hyoung-Juhn,Hong, Bo Ki,Cho, EunAe Elsevier 2014 Journal of Power Sources Vol.266 No.-
<P><B>Abstract</B></P> <P>Polymer electrolyte membrane fuel cell (PEMFC) stacks in a fuel cell vehicle can be inevitably exposed to harsh environments such as cold weather in winter, causing water flooding by the direct flow of condensed water to the electrodes. In this study, anode flooding was experimentally investigated with condensed water generated by cooling the anode gas line during a long-term operation (∼1600 h). The results showed that the performance of the PEMFC was considerably degraded. After the long-term experiment, the thickness of the anode decreased, and the ratio of Pt to carbon in the anode increased. Moreover, repeated fuel starvation of the half-cell severely oxidized the carbon surface due to the high induced potential (>1.5 V<SUB>RHE</SUB>). The cyclic voltammogram of the anode in the half-cell experiments indicated that the characteristic feature of the oxidized carbon surface was similar to that of the anode in the single cell under anode flooding conditions during the long-term experiment. Therefore, repeated fuel starvation by anode flooding caused severe carbon corrosion in the anode because the electrode potential locally increased to >1.0 V<SUB>RHE</SUB>. Consequently, the density of the tri-phase boundary decreased due to the corrosion of carbons supporting the Pt nanoparticles in the anode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Anode flooding can occur by direct flow of condensed water in humidified fuel. </LI> <LI> Anode flooding induces local fuel starvation and high potential in the anode. </LI> <LI> High potential locally present in the anode results in anode carbon corrosion. </LI> <LI> Anode carbon corrosion plays a key role in MEA degradation by anode flooding. </LI> </UL> </P>
서만수(Mansu Seo),고민호(Min-Ho Ko),선정운(Jeong-Woon Sun),서현민(Hyun-Min Suh),이재준(Jae Jun Lee),강선일(Sunil Kang) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.5
발사대 시스템의 산화제 공급계(Liquid Oxygen Filling System)는 발사체의 추진제(Propellant) 중 연료의 연소를 위한 산화제(Oxidizer)로 사용되는 액체 산소(Liquid Oxygen)를 저장하고, 발사체 요구조건에 맞게 공급하는 하는 설비이다. 본 논문에서는 한국형 발사체(KSLV-II) 발사대 시스템 상세설계(Critical Design, 2015년 8월에서 2016년 4월, 8개월) 동안 수행된 한국형 발사체 발사대 시스템 추진제 공급설비의 산화제 공급계 설계 내용을 주요 설비 구성에 대하여 구조적 관점으로 소개한다. In this paper, the liquid oxygen filling system (LOXFS) of the launch complex system of Korea Space Launch Vehicle-II (KSLV-II) is introduced based on critical design result by KARI in 2015 to 2016. The function and specification of the main systems of the liquid oxygen filling system, such as the storage tank, the drainage tank, the supply pumping system, the curved heat exchanger with liquid nitrogen, end valve block system, and umbilical connection, are presented.
Using Tractography to Distinguish SWEDD from Parkinson's Disease Patients Based on Connectivity
Kim, Mansu,Park, Hyunjin Hindawi Publishing Corporation 2016 Parkinson’s disease Vol.2016 No.-
<P><I>Background</I>. It is critical to distinguish between Parkinson's disease (PD) and scans without evidence of dopaminergic deficit (SWEDD), because the two groups are different and require different therapeutic approaches.<I> Objective</I>. The aim of this study was to distinguish SWEDD patients from PD patients using connectivity information derived from diffusion tensor imaging tractography.<I> Methods</I>. Diffusion magnetic resonance images of SWEDD (<I>n</I> = 37) and PD (<I>n</I> = 40) were obtained from a research database. Tractography, the process of obtaining neural fiber information, was performed using custom software. Group-wise differences between PD and SWEDD patients were quantified using the number of connected fibers between two regions, and correlation analyses were performed based on clinical scores. A support vector machine classifier (SVM) was applied to distinguish PD and SWEDD based on group-wise differences.<I> Results</I>. Four connections showed significant group-wise differences and correlated with the Unified Parkinson's Disease Rating Scale sponsored by the Movement Disorder Society. The SVM classifier attained 77.92% accuracy in distinguishing between SWEDD and PD using these identified connections.<I> Conclusions</I>. The connections and regions identified represent candidates for future research investigations.</P>