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윤용호 ( Yongho Yoon ),정지훈 ( Jihoon Jung ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.5
V-Cr-Y 합금은 높은 투과도와 선택도를 가진 수소 분리막 재료이다. V-Cr-Y 분리막의 투과속도를 증가시키기 위하여 sputtering을 이용한 V-Cr-Y 박막을 제조하고 그 특성을 연구하였다. V-Cr-Y 성분이 각각 89.8%, 10.0%, 0.2%인 타겟을 이용하여 실리콘웨이퍼 위에 박막을 증착시켰으며, EDS 분석을 통해 박막조성이 타겟조성과 일치함을 확인하였다. 스퍼터링 온도와 출력이 증가할수록 박막의 성장속도와 결정크기가 증가하였으며, 압력이 감소할수록 결정구조가 보다 미세하고 치밀해졌다. 최적 스퍼터링 조건은 교류 고주파(RF), 2mTorr, 300W, 상온이었으며, 이 조건으로 제조한 박막을 열처리 하여 수소분리에 적합한 박막을 얻을 수 있었다. V-Cr-Y alloy is a material for hydrogen separation membrane possessing high transmittance and selectivity. In order to increase the rate of hydrogen permeation flux through the membrane, V-Cr-Y thin film was prepared using a sputtering technique and was investigated focusing on its basic properties. Thin film was deposited on a silicon wafer using a target including V (89.8%), Cr (10.0%) and Y(0.2%), and results of EDS analysis confirm that the ratio of metal in thin film agrees with that in the target. Higher sputtering temperature and power resulted in more rapid growth rate of the thin film and larger size of the crystals, and denser and finer crystal structure was observed when lower pressure was applied. An optimal sputtering condition was found with RF, 2mTorr, 300W and ambient temperature, and a suitable V-Cr-Y thin film for hydrogen separation was obtained upon heat treatment of the thin film prepared in this way.
Sb-AlC<sub>0.75</sub>-C composite anodes for high-performance sodium-ion batteries
Jung, Gyu Jin,Lee, Yongho,Mun, Yoo Seok,Kim, Hyeongwoo,Hur, Jaehyun,Kim, Tae Young,Suh, Kwang S.,Kim, Ji Hyeon,Lee, Daeho,Choi, Wonchang,Kim, Il Tae Elsevier 2017 Journal of Power Sources Vol.340 No.-
<P><B>Abstract</B></P> <P>Antimony (Sb) nanoparticles dispersed in a hybrid matrix consisting of aluminum (Al) and carbon, AlC<SUB>0.75</SUB>-C were synthesized via one-step high-energy mechanical milling (HEMM) process and assessed as potential anode materials for use in sodium-ion batteries. The introduction of carbon during HEMM led to the formation of individual Sb nanoparticles dispersed in the AlC<SUB>0.75</SUB>-C matrix; in the absence of carbon during HEMM, an AlSb alloy was formed. The Sb-AlC<SUB>0.75</SUB>-C composite anodes demonstrated better cycling performance as well as higher rate capability compared to an AlSb anode; these improved properties could be due to the well-developed Sb phase, which acts as an electrochemically active nanocrystalline material in the AlC<SUB>0.75</SUB>/carbon conductive matrix. Furthermore, when fluoroethylene carbonate (FEC) was added to the electrolyte, the sodium-ion cells exhibited the best electrochemical performances, corresponding to a capacity retention of 83% at 100 cycles at 100 mA g<SUP>−1</SUP> and a high rate capacity retention of 58% at 5000 mA g<SUP>−1</SUP>. In addition, the as-prepared Sb-AlC<SUB>0.75</SUB>-C composite has a high tap density; thus, its volumetric capacity was approximately three times that of carbon.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sb composite with AlC<SUB>0.75</SUB> and C as a matrix was prepared via one-step HEMM. </LI> <LI> The Sb-AlC<SUB>0.75</SUB>-C composite shows better cyclability compared to AlSb. </LI> <LI> FEC additive makes Sb-AlC<SUB>0.75</SUB>-C to exhibit stable cyclic and high-rate performance. </LI> <LI> Sb-AlC<SUB>0.75</SUB>-C anode demonstrates high volumetric capacity compared to carbon. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
An Adaptive Goal-Based Model for Autonomous Multi-Robot Using HARMS and NuSMV
Yongho Kim,Jin-Woo Jung,John C. Gallagher,Eric T. Matson 한국지능시스템학회 2016 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.16 No.2
In a dynamic environment autonomous robots often encounter unexpected situations that the robots have to deal with in order to continue proceeding their mission. We propose an adaptive goal-based model that allows cyber-physical systems (CPS) to update their environmental model and helps them analyze for attainment of their goals from current state using the updated environmental model and its capabilities. Information exchange approach utilizes Human-Agent-Robot-Machine-Sensor (HARMS) model to exchange messages between CPS. Model validation method uses NuSMV, which is one of Model Checking tools, to check whether the system can continue its mission toward the goal in the given environment. We explain a practical set up of the model in a situation in which homogeneous robots that has the same capability work in the same environment.