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철원소를 함유한 분자기반 생체물질 나노입자들의 연 x선 방사광 분광 연구
이은숙(Eunsook Lee),김대현(D. H. Kim),황지훈(Jihoon Hwang),이기호(Kiho Lee),강정수(J.-S. Kang) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.4
By employing soft x-ray absorption spectroscopy (XAS) and soft x-ray magnetic circular dichroism (XMCD), the electronic structures of molecule-based nano bioparticles, such as Helicobacter pylori ferritin (H. pylori ferritin), Heme, NaM[Fe(CN)?] · H₂Otype Prussian Blue (M=Co, Ni) analogue, have been investigated. The measured Fe 2p XAS spectra reveal that Fe ions are trivalent (Fe<SUP>3+</SUP>) in H. pylori ferritins, while they are in the Fe<SUP>2+</SUP>-Fe<SUP>3+</SUP> mixed-valent states in NaM[Fe(CN)6] · H2O Prussian Blue analogues (M=Co, Ni). According to the Fe 2p XMCD spectrum of high-state H. pylori ferritin, all the Fe<SUP>3+</SUP> ions have the same local symmetry and their magnetic moments are aligned in the same direction. It is also found that the Fe 3d orbitals in NaM[Fe(CN)?] · H₂O have a strong covalent bonding to (CN)? ligands, but with a very weak bonding to the 2p orbitals of O ligands.
4각 딥드로잉 클래드판재 성형공정의 탄소성 유한요소해석
이민철(M. C. Lee),홍석무(S. M. Hong),황지훈(J. H. Hwang),심재원(J. W. Sim),이장호(J. H. Lee),정완진(W. J. Chung),전만수(M. S. Joun) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
In this paper, three-dimensional elastoplastic finite element approach to simulating a clad-metal sheet metal forming process is presented. The approach is based on a layered finite element mesh system with tetrahedral elements and a force imposing die to deal with blanking holder force. The predictions are compared with experiments, revealing that they are in a good agreement with each other.
방사광을 이용한 FeV<SUB>2</SUB>O<SUB>4</SUB> 스피넬 산화물의 덩치상태와 분말상태의 전자구조 차이 연구
황지훈(Jihoon Hwang),김대현(D. H. Kim),이은숙(Eunsook Lee),강정수(J.-S. Kang),김우철(W. C. Kim),김철성(C. S. Kim),한상욱(S. W. Han),홍순철(S. C. Hong),박병규(B.-G. Park),김재영(J.-Y. Kim) 한국자기학회 2011 韓國磁氣學會誌 Vol.21 No.6
The electronic structure of ferrimagnetic spinel oxide of FeV<SUB>2</SUB>O<SUB>4</SUB> has been investigated by employing soft x-ray absorption spectroscopy (XAS) and soft x-ray magnetic circular dichroism (XMCD). The Fe 2p and V 2p XAS spectra show that the valence states of Fe and V ions are ~Fe<sup>2.3+</sup> mixed-valent states and ~V3+ states, respectively. In Fe 2p XMCD spectra, finite XMCD signals are observed for divalent Fe<sup>2+</sup> states only, but not for Fe<sup>3+</sup> states. This finding indicates that the magnetic moments of Fe<sup>2+</sup> ions are ordered ferromagnetically but that those of Fe<SUP>3+</SUP> ions are cancelled, implying that Fe<sup>2+</sup> ions play an important role in determining magnetic properties of FeV<SUB>2</SUB>O<SUB>4</SUB>.