http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
방사광 광전자 분광법을 이용한 Co - Pd 합금박막의 전자구조 연구
강정수(J. S. Kang),권세균(S. K. Kwon),하양장(Y. J. Ha),민병일(B. I. Min),조용필(Y. P. Cho),이창섭(C. S. Ri),정인범(I. B. Chung),구양모(Y. M. Koo),김건호(K. H. Kim),김봉수(B. S. Kim) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.6
Valence band photoemission spectroscopy (PES) measurements have been performed for Co_xPd_(100-x) alloy films using synchrotron radiation (x=0, 25, 40, 65). Then the partial spectral weight distributions (PSW’s) of Co 3d and Pd 4d electrons have been determined. The Co 3d PSW’s exhibit some structures which are quite different from those of the Co film for x<25 %, whereas they become very similar to those of the Co film for x>40 %. For x<25 %, the peak near the Fermi level (E_F) and a shoulder around 2 eV binding energy in the Co 3d PSW reflect large hybridization between Pd 4d and Co 3d electrons, suggesting that the hybridization might play an inportant role in determining perpendicualr magnetic anisotropy. The Pd 4d PSW’s in Co-Pd alloy films are found to have larger FWHM’s (full widths at half maximum), larger binding energies of the main peaks, and larger spectral intensities at E_F than the PES spectrum of the Pd film. The FWHM of the Pd 4d PSW increases with decreasing Pd concentration, which are considered to reflect the disordering effect in the alloy formation or the change in the Pd 4d electronic structure due to hybridization between Co 3d and Pd 4d electrons.
Valence Band Photoemission Study of Co / Pd Multilayer
강정수(J.-S. Kang),강상국(S.K. Kim),정재인(J.I. Jeong),홍재화(J.H. Hong),이영백(Y.P. Lee),신현준(H.J. Shin),C. G. Olsong(C. G. Olsong) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.1
We report the photoemission (PES) studies for the Co /Pd multilayer. The Co 3d PES spectrum of Co /Pd exhibits two interesting features, one near the Fermi energy, E_F, and another at ~2.5 eV below E_F. the Co 3d peak near E_F of Co /Pd is much narrower than that of the bulk Co, consistent with the enhanced Co magnetic moment in Co /Pd compared to that in the bulk Co. The Co 3d feature at ~ -2.5 eV resembles the Pd valence band structures, which suggests a substantial hybridization between the Co and Pd sublayers. The Co 3d PES spectrum of Co /Pd is compared with the existing band structures, obtained using the local spin density functional calculations. A reasonable agreement is found concerning the bandwidth of the occupied part of the Co 3d band, whereas a narrow Co 3d peak near E_F seems not to be described by the band structure calculations.
용접공진폐증 집단검진을 위한 단순 흉부방사선 촬영과 고해상 흉부전산화 단층촬영의 진단적 의의
강정학,전진호,구혜원,고광수,유병철,손혜숙,이종태,이채언,김건일,최석진,Kang, J.H.,Chun, J.H.,Gu, H.W.,Ko, K.S.,Yu, B.C.,Sohn, H.S.,Lee, J.T.,Lee, C.U.,Kim, K.I.,Choi, S.J. 대한예방의학회 1996 예방의학회지 Vol.29 No.4
Pneumoconiosis is one of the major problem in the field of occupational health at Korea. Therefore, the efficient diagnosis of pneumoconiosis is a hot issue on the occupational health program. The author executed this study to estimate the diagnostic value of high resolution computed tomography(HRCT) compared with chest radiography for screening of welder's lung. HRCT was introduced very recently for the diagnosis of pneumoconiosis, however, the diagnostic value for screening of welder's lung - principally nonfibrogenic and reversible - has not been evaluated. The subjects were fifty cases of welder's lung or suspected cases who had been collected between 1989 and 1994 from one shipyard and continuously followed-up on the basis of in-plant periodic health check program. We applied both chest radiography and HRCT on the same subjects from May 1 to 30, 1996. The images were evaluated by two careered radiologists independently. The findings of chest radiography were classified into four category by ILO classification, and the findings of HRCT according to the criteria of Bergin et al. The concordance between two radiologists expressed with Kendall's tau-b was 0.72 by chest radiography and 0.44 by HRCT- that is, interobserver variation of HRCT was bigger than that of chest radiography. The concordance between the two different methods was highly variable as 0.44 by radiologist A and 0.06 by radiologist B - that is, interobserver variation was very big. However, HRCT looked more detectable for the minor parenchymal change. These findings suggested that it is not appropriate to use HRCT routinely for screening of welder's lung due to lack of diagnostic criteria, and feasibility, acceptability and economic aspects. Nevertheless, HRCT might be recommendable in the case of equivocal parenchymal features on the chest radiography, unexplained respiratory symptoms, and/or lung function abnormalities suggestive of interstitial fibrosis.
급속가열 및 압축의 효과가 7인치 도광판의 복굴절 분포에 미치는 영향에 관한 실험적 연구
민인기(I. K. MIn),홍석관(S. K. Hong),강정진(J. J. Kang),김민구(M. G. Kim),정의철(E. C. Jung),윤경환(K. H. Yoon) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
As the growth of injection molding technology, injected-molded optical products require higher dimension accuracy and optical stability than ever. In the present study, four kinds of molding mechanisms, i.e., conventional injection molding(CIM), injection/compression molding(ICM), rapid heat and cooling the mold(RHCM) and rapid injection/compression molding(RICM) were chosen to investigate the optical anisotropy of 7 inch LGP by examining the in-plane and gap-wise distribution of birefringence and extinction angle. As a result, the compression process could decrease flow-induced birefringence for the whole region and rapid heating could decrease the birefringence level than conventional molding mechanism. Finally, for the combination of compression and rapid heating, the reversal flow was detected from the distribution of extinction angle near the gate.
홍재화(J.H. Hong),강정수(J.S. Kang),정재인(J.I. Jeong),전인준(I.J. Jeon),이영백(Y.P. Lee) 한국진공학회(ASCT) 1992 Applied Science and Convergence Technology Vol.1 No.2
냉연강판의 성능은 그 표면 상태에 의해서 많은 영향을 받는다. Temper-color(T/C)층은 tempering 과정 중 형성되는 다양한 색깔의 얇은 산화층으로서, 우수한 표면 품질을 갖기 위해서는 방지 또는 제어되어져야 한다. T/C 현상을 이해하기 위하여 여러 가지 표면 분석방법이 동원되었다. 유백색 T/C층의 표면은 1 ㎛ 크기의 구형의 미세구조로 구성되어 있었다. 소둔과정 중 C, Si, Mn과 Al이 표면으로 농화됨을 알았고, Mn과 C은 정상시료에서 보다 T/C 시료에서 농화가 심하였다. T/C 시료에서의 산화층 두께는 정상시료의 60-100 Å 보다 매우 두꺼웠으나, 발생 정도에 따라 변화하였다. T/C층 내의 각 원소 산화 상태는, Si은 SiO₂의 상태로, Mn은 MnO나 MnO₂의 상태로 Fe는 극표면층의 Fe₂O₃ 상태를 제외하고는 metallic 상태로 분석되었다. The performance of the cold-rolled steel sheet is affected strongly by the surface conditions. Temper-colored (T/C) layer, which is the formation of a thin colored layer on the surface in the tempering process, is one of the phenomena which should be overcome to secure the improved surface quality. The layers were exposed to a variety of surface-analysis techniques for the characterization. The surface of milky-color T/C film consists of droplet-shaped microstructures in the size of around 1 ㎛. C, Si, Mn and Al are segregated to the surface during annealing. Mn and C are found to be more enriched at the surface of T/C sample than the normal one. The thickness of the oxide of T/C sample is much larger than the normal one of 60-100 Å, but varies in a wide range according to the degree of T/C. The oxidation state of Si in T/C film was analyzed to be SiO₂, and that of Mn to be MnO or MnO₂. On the contrary, Fe was metallic with Fe₂O₃ phase only at the extreme surface.