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Microcontroller Implementation of Rule-based Inference System for Smart Home
BonJae Koo,Young Soo Park,SungHyun Yang 보안공학연구지원센터 2014 International Journal of Smart Home Vol.8 No.6
Recently, the development of Machine to Machine (M2M) communication has been largely accomplished in a variety of fields including smart home. In M2M communication, the role of sensor node is only limited to gather data and send them to upper application layers. In this research, the limited role of the sensor node in traditional M2M communication is improved in order for the sensor node to make inference based on the sensor data. If the sensor node can make inference, it is possible to provide basic context-aware services within sensor node level. Therefore, in this paper, implementation of rule-based inference system on microcontroller for smart home is proposed.
Koo, Bonjae,Kim, Hyunjung,Cho, Younghyun,Lee, Kyu Tae,Choi, Nam‐,Soon,Cho, Jaephil WILEY‐VCH Verlag 2012 Angewandte Chemie Vol.124 No.35
<P><B>Ein vernetztes Polymer</B> als Bindemittel (rot im Bild) verhindert mechanische Brüche in negativen Siliciumelektroden. Silicium‐Nanopulver in einem 3D‐Gerüst aus Polyacrylsäure und Natriumcarboxymethylcellulose zeigt eine hohe reversible Kapazität (>2000 mAh g<SUP>−1</SUP>) nach 100 Zyklen bei 30 °C und behält eine hohe Kapazität und Stromdichte bei.</P>
Enhanced oxygen exchange of perovskite oxide surfaces through strain-driven chemical stabilization
Koo, Bonjae,Kwon, Hyunguk,Kim, YeonJu,Seo, Han Gil,Han, Jeong Woo,Jung, WooChul The Royal Society of Chemistry 2018 Energy & environmental science Vol.11 No.1
<P>Surface cation segregation and phase separation, of strontium in particular, have been suggested to be the key reason behind the chemical instability of perovskite oxide surfaces and the corresponding performance degradation of solid oxide electrochemical cell electrodes. However, there is no well-established solution for effectively suppressing Sr-related surface instabilities. Here, we control the degree of Sr-excess at the surface of SrTi0.5Fe0.5O3−δ thin films, a model mixed conducting perovskite O2-electrode, through lattice strain, which significantly improves the electrode surface reactivity. Combined theoretical and experimental analyses reveal that Sr cations are intrinsically under a compressive state in the SrTi0.5Fe0.5O3−δ lattice and that the Sr-O bonds are weakened by the local pressure around the Sr cation, which is the key origin of surface Sr enrichment. Based on these findings, we successfully demonstrate that when a large-sized isovalent dopant is added, Sr-excess can be remarkably alleviated, improving the chemical stability of the resulting perovskite O2-electrodes.</P>
메탄의 산화 이량화 반응을 위한 고활성 단일 금속 산화물 촉매 개발 연구 동향
최고은(Goune Choi),구본재(Bonjae Koo) 한국세라믹학회 2021 세라미스트 Vol.24 No.4
The conversion of methane to a value-added chemical is important for methane utilization and industrial demand for primary chemicals. Oxidative coupling of methane (OCM) to C2 hydrocarbons is one of the most attractive ways to use natural gas. However, it is difficult to obtain higher C2 yield in classic OCM reaction due to a favorable COx formation. Regarding this, various catalysts for OCM have been studied to fulfill desirable C2 yields. In this review, we briefly overview the single metal oxide types of OCM catalysts (alkaline-earth metal oxides and rare-earth metal oxides) and highlight the characteristics of catalysts in OCM reaction such as methane activation, surface basicity and lattice oxygen.
Jo, Yong-Ryun,Koo, Bonjae,Seo, Min-Ji,Kim, Jun Kyu,Lee, Siwon,Kim, Kyeounghak,Han, Jeong Woo,Jung, WooChul,Kim, Bong-Joong American Chemical Society 2019 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.141 No.16
<P>A precise control of the size, density, and distribution of metal nanoparticles dispersed on functional oxide supports is critical for promoting catalytic activity and stability in renewable energy and catalysis devices. Here, we measure the growth kinetics of individual Co particles ex-solved on SrTi<SUB>0.75</SUB>Co<SUB>0.25</SUB>O<SUB>3-δ</SUB> polycrystalline thin films under a high vacuum, and at various temperatures and grain sizes using in situ transmission electron microscopy. The ex-solution preferentially occurs at grain boundaries and corners which appear essential for controlling particle density and distribution, and enabling low temperature ex-solution. The particle reaches a saturated size after a few minutes, and the size depends on temperature. Quantitative measurements with a kinetic model determine the rate limiting step, vacancy formation enthalpy, ex-solution enthalpy, and activation energy for particle growth. The ex-solved particles are tightly socketed, preventing interactions among them over 800 °C. Furthermore, we obtain the first direct clarification of the active reaction site for CO oxidation-the Co-oxide interface, agreeing well with density functional theory calculations.</P> [FIG OMISSION]</BR>
박준범 ( Junbeom Park ),구본재 ( Bonjae Koo ),이우주 ( Wuju Lee ),이상빈 ( Sangbin Lee ) 한국정보처리학회 2016 한국정보처리학회 학술대회논문집 Vol.23 No.1
The importance of the infusion pump monitoring system has become amplified in accordance with the growth of IoT(Internet of Things) technology and medical devices. A monitoring system can be described as an essential part of infusion pump system because the patient must be observed all the time. Infusion pump monitoring system is significant to have better safety and efficiency. In this paper, we propose an efficient algorithm and scheme in the infusion monitoring system. In particular, the proposed algorithm based on the time of the database interlocking part was found to have a 30% higher efficiency than the conventional method.
Kim, YeonJu,Jeong, Seung Jin,Koo, Bonjae,Lee, Siwon,Kwak, No Woo,Jung, WooChul The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.27
<P>(La,Sr)MnO3−δ has received a great deal of attention as an oxygen carrier that can replace the state-of-the-art carrier CeO2 for solar-driven thermochemical fuel production. Despite the many relevant studies, however, the redox reaction kinetics of this material, which determines the fuel production rate, has rarely been reported. Here, we investigate the surface reaction rate of reduced Sr-doped lanthanum manganite thin films, as a model for a gas/solid interface of a perovskite-structured oxygen carrier under a condition, in which carbon monoxide is produced from CO2 in a two-step thermochemical cycling process. Thin films of La1−xSrxMnO3−δ (<I>x</I> = 0.1, 0.2, 0.3, 0.4) with dense and flat surfaces are fabricated <I>via</I> pulsed laser deposition, and their surface oxygen exchange rates are then characterized <I>via</I> electrical conductivity relaxation under actual operating conditions (<I>T</I> = 650 to 800 °C and <I>p</I>O2 = 2.9 × 10<SUP>−19</SUP> to 9.0 × 10<SUP>−13</SUP> atm). As the Sr content increases, the oxygen exchange greatly decelerates. On the other hand, for a given Sr content, the oxygen exchange does not vary much over a wide range of <I>p</I>O2 near the target temperature of 800 °C. We also observe the surface oxygen exchange rate has a direct impact on the CO production rate. These observations can guide the selection of an ideal oxygen carrier composition for high-performance fuel production.</P>