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Oxidation Behaviors of Si/Al Pack Cementation Coated Mo–3Si–1B Alloys at Various Temperatures
Wonchul Yang,최광수,Kyeong‑Ho Baik,Youngmoo Kim,Seong Lee,Jeongmin Kim,Jongwon Lee,Joon Sik Park 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
In this study, we tried to improve the oxidation resistance of Mo–3Si–1B (wt%) alloy at intermediate (800 °C) and high temperature(1300 °C) after applying Si/Al pack cementation coatings. In addition, we examined structural changes and phasechange in the intermediate and high temperature oxidizing atmospheres to observe oxidation behaviors. The diffusion packcoatings were carried out with an NH4Factivator and both Si and Al powder mixtures. Mo–Si–B alloys were subjected todiffusion coatings of Si/Al powders at various temperatures in various time conditions at a temperature of 1100 °C. Whenthe pack coatings were carried out for 48 h, Mo(Si, Al)2 and Mo3Al8layers together with a T2 (Mo5SiB2) layer were successfullysynthesized on the substrate. After oxidation tests, an Al2O3protective oxide layer was formed by the diffusionof Al in an ambient atmosphere. The Si/Al pack cementation coatings provided excellent oxidation resistance through theformation of an Al2O3oxide layer. The enhanced oxidation behaviors are discussed in terms of microstructural evolution athigh temperatures.
수용가 포탈 시스템 기반의 전력부가서비스 구축 방안 연구
양원철(WonChul Yang),김재희(JaeHee Kim),김상수(SangSoo Kim) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.2D
선진 전력시장의 경우, 전력산업의 환경변화에 따라 소비자의 역할이 증대되고 있으며 이와 더불어 IT 기반의 다양한 소비자 중심의 전력부가서비스의 개발이 시도되고 있거나 일부 제공되고 있다. 이러한 서비스의 발전은 시간이 흐르면서 단방향이 아닌 양방향 통신 기반의 소비자 중심 서비스에 대한 연구로 확대되고 있다. 특히, 미국 EPRI의 IntelliGrid 컨소시엄에서 제시한 수용가 포탈 시스템은 소비자 영역내의 장비와 에너지 서비스 기관 간의 양방향 통신을 전제함으로써 이루어지는 통합적인 개념의 서비스 기반으로써, 공급자를 포함한 ESP(Energy Service Provider)와 소비자는 수용가 포탈을 기반으로 원활한 커뮤니케이션을 수행하고 그 결과를 이용한 부가적 이익을 누릴 수 있게 된다. 이에 비해 국내의 전력부가서비스 제공 수준은 이제 겨우 시작 단계에 불과하지만, 서비스에 대한 인식 정도와 IT기술의 발전 속도를 생각해 본다면 머지않아 국내 전력산업에서도 현재의 서비스 제공 수준을 한 단계 넘어선 양방향 통신 기반의 수준 높은 전력부가서비스를 요구하게 될 것이다. 따라서, 국내 환경에 적합한 수용가 포탈 시스템 기반의 전력부가서비스 창출은 수용가에게는 비용 절감이 가능한 합리적인 소비를 제시하고, ESP(Energy Service Provider)에게는 부하·수요관리 및 투자비를 절감할 수 있는 기회를 제공해야 할 것이다. 본 논문에서는 새로운 전력부가서비스 기반인 수용가 포탈시스템을 분석하고, 현행 전력부가서비스의 현황과 동향 분석, 적용가능 기술 분석, 타 산업 벤치마킹을 통해 국내환경에 적합한 수용가 포탈 시스템 기반의 전력부가서비스 선정 및 구축 방안을 제시하고자 한다.
국내 환경에 적합한 전력부가서비스 BM 개발 및 시스템 구축 방안
양원철(WonChul Yang),김재희(JaeHee Kim),김상수(SangSoo Kim) 한국정보과학회 2008 한국정보과학회 학술발표논문집 Vol.35 No.1
선진 전력시장에서는 오래전부터 전력부가서비스의 중요성을 깨닫고, 전력부가서비스와 전력부가서비스 지원을 위한 인프라에 관하여 다양한 연구와 시도가 지속적으로 이루어지고 있다. 한편, 국내에서는 전력부가서비스를 인식하고는 있지만 아직까지 이와 같은 연구와 개발이 활성화되지는 못하고 있다. 그러나 전력부가서비스는 전력시장의 변화가 만들어낸 결과물로써, 시간이 흐를수록 그 중요성은 더욱 증가할 것이다. 또한 전력부가서비스 시장은 아직까지 미개척 분야가 많은 블루오션이므로, 국내시장 및 아직까지 전력부가서비스가 도입되지 못한 해외전력시장에도 진출할 수 있는 가능성을 가진다. 본 논문에서는 초기단계인 만큼 가능성과 위험이 공존하는 국내의 전력시장에서 성공적인 전력부가서비스를 개발하기 위해, 세계적인 전력시장의 변화와, 이 변화가 국내 전력시장에 미친 영향, 그리고 국내 시장의 전력부가서비스 환경을 분석함으로써, 국내 환경에 적합한 전력부가서비스 BM을 개발하고 이를 시스템으로 구축하는 방안에 대하여 소개하고자 한다.
Kang, Wonchull,Hong, Se Hoon,Lee, Hye Min,Kim, Na Yeon,Lim, Yun Chan,Le, Le Thi My,Lim, Bitna,Kim, Hyun Chul,Kim, Tae Yeon,Ashida, Hiroki,Yokota, Akiho,Hah, Sang Soo,Chun, Keun Ho,Jung, Yong-Keun,Yang National Academy of Sciences 2014 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.111 No.1
<P>APIP, Apaf-1 interacting protein, has been known to inhibit two main types of programmed cell death, apoptosis and pyroptosis, and was recently found to be associated with cancers and inflammatory diseases. Distinct from its inhibitory role in cell death, APIP was also shown to act as a 5-methylthioribulose-1-phosphate dehydratase, or MtnB, in the methionine salvage pathway. Here we report the structural and enzymatic characterization of human APIP as an MtnB enzyme with a <I>K</I><SUB><I>m</I></SUB> of 9.32 μM and a <I>V</I><SUB><I>max</I></SUB> of 1.39 μmol min<SUP>−1</SUP> mg<SUP>−1</SUP>. The crystal structure was determined at 2.0-Å resolution, revealing an overall fold similar to members of the zinc-dependent class II aldolase family. APIP/MtnB exists as a tetramer in solution and exhibits an assembly with <I>C4</I> symmetry in the crystal lattice. The pocket-shaped active site is located at the end of a long cleft between two adjacent subunits. We propose an enzymatic reaction mechanism involving Glu139* as a catalytic acid/base, as supported by enzymatic assay, substrate-docking study, and sequence conservation analysis. We explored the relationship between two distinct functions of APIP/MtnB, cell death inhibition, and methionine salvage, by measuring the ability of enzymatic mutants to inhibit cell death, and determined that APIP/MtnB functions as a cell death inhibitor independently of its MtnB enzyme activity for apoptosis induced by either hypoxia or etoposide, but dependently for caspase-1-induced pyroptosis. Our results establish the structural and biochemical groundwork for future mechanistic studies of the role of APIP/MtnB in modulating cell death and inflammation and in the development of related diseases.</P>
조원철(Wonchul Cho),박영수(Youngsu Park),임양남(Yang Nam Lim),김대헌(Taehum Kim),이창근(Changeun Lee) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6
The controller of an automotive braking system requires complex parameter calibration, and current parameter calibration relies on expensive real vehicle testing or simulation methods. Simulation takes less time, but the parameters of the braking system are very large and the search range is also very wide, which takes a lot of time to optimize. Through the AMDEAS method proposed in this study, the important control parameters can be quickly identified through the optimization system and the user can tune the major parameters. In addition to finding optimal solution, AMDEAS can also classify parameters by their importance.
The Crystal Structure of L-Leucine Dehydrogenase from Pseudomonas aeruginosa
Seheon Kim,고세리,Wonchull Kang,Jin Kuk Yang 한국분자세포생물학회 2022 Molecules and cells Vol.45 No.7
Leucine dehydrogenase (LDH, EC 1.4.1.9) catalyzes the reversible deamination of branched-chain L-amino acids to their corresponding keto acids using NAD+ as a cofactor. LDH generally adopts an octameric structure with D4 symmetry, generating a molecular mass of approximately 400 kDa. Here, the crystal structure of the LDH from Pseudomonas aeruginosa (Pa-LDH) was determined at 2.5 Å resolution. Interestingly, the crystal structure shows that the enzyme exists as a dimer with C2 symmetry in a crystal lattice. The dimeric structure was also observed in solution using multiangle light scattering coupled with size-exclusion chromatography. The enzyme assay revealed that the specific activity was maximal at 60°C and pH 8.5. The kinetic parameters for three different amino acid and the cofactor (NAD+) were determined. The crystal structure represents that the subunit has more compact structure than homologs’ structure. In addition, the crystal structure along with sequence alignments indicates a set of non-conserved arginine residues which are important in stability. Subsequent mutation analysis for those residues revealed that the enzyme activity reduced to one third of the wild type. These results provide structural and biochemical insights for its future studies on its application for industrial purposes.
SangJin Kim,SeongWoo Nam,WonChul Yang,JinChul Kim,JaeHee Kim,SangSoo Kim 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Utilities in advanced power markets realized the importance of power value-added services, and they have studied power value-added services and the infrastructure for the services. In Korea, we also know the importance of power value-added services but R&D for the services is not vitalized. As time goes by, the importance of the services will be increased because the services are caused by the change of power market and this change will continue. Because this power value-added service market is the Blue ocean which is undeveloped yet, it has potentialities to penetrate world market which these services are not introduced. In this paper, we will introduce how to develop the value added-service BM(Business Model) and its system for Korea power market through analyzing international power market change, the effect of this change for Korea power market and present state of Korea power value-added service environment.