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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.
Zeeman 방식의 He-Ne 레이저를 이용한 마이크로 포머에서 발생되는 미소 변위 측정에 관한 연구
김대현(D. H. Kim),최경현(G. H. Choi),최재원(J. W. Choi),이석희(S. H. Lee),나경환(K. H. Na),김승수(S. S. Kim) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A micro former among micro machines is known as a useful tool for machining micro parts. It makes micro holes automatically with punches, a hole-shape die and material by rotation of crank shaft synchronously. Micro displacement in micro forming affects on the performance of machining because micro forming size is similar with its mechanical displacement. Therefore, the measurement of this micro displacement is essential to be guaranteed to obtain high forming precision in the whole machine as well as its devices. This paper addresses the development of a laser interferometer to measure micro displacement for a micro former. The laser interferometer is able to measure micro displacement during a few micro seconds with non-contact. For the experiment, a laser probe installed on the optical table with optical devices and a micro stage. Moving mirror set up upside of micro stage. The velocity decoding board is also added to calculate doppler shift frequency directly. The output signal is processed by LabView. Finally experiments are found out the relation between displacement and output signal.