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Byungchan Han(한병찬) 한국표면공학회 2022 한국표면공학회 학술발표회 초록집 Vol.2022 No.6
A nanocatalyst is at the central position as a promoter of various chemical. Innovative design of highly functional catalyst materials has been, however, delayed. In molecular level computational electrochemistry new research paradigm has been established, which substantially incorporates IT-based artificial intelligence (AI) technology into machine learning algorism. Using the new computational methodology high-throughput screening of promising nanoparticle candidates has been attempted for various desired applications. Whether the frontier approach is successful or not is significantly controlled by the reliability and accuracy of input database. It is true that substantial amounts of the data are come by previous literatures and often ab-initio calculations with idealized model systems. The conditions in which the data were generated may be so different from the operando circumstances of the target materials. To secure extreme-level integrity of the database the in-situ measurement of nanoparticle structures should be carried out, from which the reliable correlation of the structure-performance-design principle can be identified. Using first-principles calculations we studied nanoparticles with adsorbate ligands in liquid solution to establish three-dimensional (3D) structure and property database, which are, then, analyzed through AI-based neural-network approach with high speed and accuracy. The information includes sizes, lattice distortions, and defects with picometer resolution under non-vacuum conditions. The computational outcomes are rigorously validated from the 3D liquid-cell electron microscopy. The approach is indeed ‘knowledge-based’ AI, which can be expected to make groundbreaking ways toward the quantum nanoarchitecture for hybrid interface materials.
Byungchan Han(한병찬),박정윤,이종민,오진우 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
인공지능형 머신러닝기법을 통해 제일원리 전산으로 구축된 빅데이터를 분석하여 연구한 유전자 조작 M13 박테리오파지 수용체 설계 기술을 소개한다. M13 파지는 유전 성질에 따라 수십억 개 이상의 고유한 표면 화학 반응성을 구현할 수 있으며, 그 표면 화학 특성은 유전자 가위로 DNA를 조작하는 방식으로 제어가 가능하다. 본 발표에서는 파지 전자코가 가시광선 영역에서 다양한 휘발성 유기물질을 센싱할 수 있음을 규명한다. 이 연구의 주요 성과는 M13 파지가, 기존 센서로는 검출이 어려운 화학물질을 육안으로 판별할 수 있는 색깔 패턴으로 쉽게 탐지할 수 있는 휴대용 생체 센서로 개발할 수 있는 과학적인 근거를 마련했다는 점이다. 이 결과를 바탕으로, 폭발성 유기 화합물에 반응하는 최적의 M13 파지 수용체를 실험으로 직접 제적하여 파지 전자코를 구현하는데 성공하고 그 소자의 성능 테스트 결과, 화학적 특성이 크게 다른 방향족/지방족 구별은 물론, 같은 화학적 분류에 속하는 유사한 화합물을 1 ppb레벨의 정확도로 판별할 수 있음이 관측된다.
한병찬(Han ByungChan),김재환(Kim JaeHwan),임승찬(Lim SeungChan),권영진(Kwan YoungJin),임남형(Lim NamHyoung),이진옥(Lee JinOk),장승엽(Jang SeungYup) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The synthetic fibers such as polyvilyl-alcohol(PVA) fiber are poised as a low cost alternative for reinforcement in structural applications. It has been reported that synthetic fiber in cement composites can control restrained tensile stresses and cracks and increase toughness, resistance to impact, corrosion, fatigue and durability. High performance fiber reinforced cementitious composite(HPFRCC) shows ultra high ductile behavior in the hardened state, because of the fiber bridging properties. In this study, it was proposed a direct tensile testing machine(DTTM) to be simple and to be applied to HPFRCC, and examined the tensile properties of HPFRCC by this machine. As a results, it was confirmed that a direct tensile test of HPFRCC could be certainly carried out DTTM to be developed in this study. Also, tensile strength and yield strength of HPFRCC were similar regardless of specimens thickness. And, all specimens revealed the stable strain-hardening behavior and multiple cracking in flexible and tensile loads. But, deviation of strain at ultimate tensile strength increased with the increase of specimen thickness.
한병찬(Han ByungChan),김재환(Kim JaeHwan),임승찬(Lim SeungChan),권영진(Kwan YoungJin),임남형(Lim NamHyoung),이진옥(Lee JinOk),장승엽(Jang SeungYup) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
High performance fiber reinforced cement composite(mortar) shows ultra high ductile behavior in the hardened state, because of the fiber bridging properties. Therefore, a variety of experiments have being performed to access the performance of the materials recently. In this study, a flexural fatigue test was carried out to investigate flexural fatigue behavior and provide basic data for fatigue design. Based on the flexural fatigue test, the fatigue safety of the high performance fiber reinforced cement mortar specimens was estimated. For the fatigue test, 10x10x40cm specimens were designed. A static flexural load test was also performed before the fatigue test to analyze the structural behavior of the specimens. The initiation of fatigue cracks in the specimens could be detected through the history of displacement range. Fatigue limit was predicted Weibull distribution using S-N relationship, and a satisfactory result was obtained.
Han, Myungseong,Shul, Yong-Gun,Lee, Hyejin,Shin, Dongwon,Bae, Byungchan Elsevier 2017 International journal of hydrogen energy Vol.42 No.52
<P><B>Abstract</B></P> <P>Nafion NRE212, Nafion HP, and a hydrocarbon-based membrane were used in an accelerated open-circuit voltage (OCV) test to examine their oxidative stability. The catalyst layer and the gas permeability were analyzed to apply the same experimental conditions for each electrolyte membrane. The accelerated OCV test was conducted for ∼800 h, and the states of the membrane electrode assembly (MEA) were investigated by measuring the electrolyte membrane resistance, cyclic voltammograms, and linear sweep voltammograms with respect to time. Typically, the sulfonated poly(arylene ether), which has a low oxidative stability, showed the best performance in the OCV test, followed by the Nafion HP membrane and Nafion NRE212 membrane. The inherent oxidative durability of the electrolyte membrane and the gas permeability likely play a crucial role in the oxidative stability during MEA operation. The results further confirmed that the gas permeability affects the stability of the electrode in the catalyst layer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We examined several membranes for use in proton exchange membrane fuel cells. </LI> <LI> We compared perfluorinated sulfonic acid and hydrocarbon electrolyte membranes. </LI> <LI> Accelerated open-circuit voltage tests determined their oxidative stability. </LI> <LI> We show that the gas permeability affects the stability of the electrode. </LI> </UL> </P>