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문홍현(H. H. Moon),박병규(B. G. Park),김성청(C. H. Lee),이찬호(S. C. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
We have developed the ultrasonic polishing system to get super finishing that consist of<br/> machine part that can rotate and travel the main shaft with power 1.5kW, ultrasonic generator with<br/> frequency 20kHz. By using this system we were investigated the characteristics of ultrasonic<br/> polishing and deduced the major facters which affect the surface roughness by the experimental<br/> plans for three different materials such as ceramic, glass, and wafer, and so could be obtained<br/> following results. We could be obtained the excellent surface for hard-to-difficult cutting<br/> materials. The rotating speed could be found to be major factor influencing the surface roughness.<br/> In the case of ceramic and wafer, we were able to obtain good surface roughness when the feed<br/> rate and ultrasonic output is higher. In the case of glass, the surface roughness becames worse<br/> when ultrasonic output is higher because of increasing of load affacting on the particles in slurry.
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>.