http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김제헌 大韓神經精神醫學會 1984 신경정신의학 Vol.23 No.4
204 stand-by replacements, 250 regular army soldiers and 300 college students were applied to Zung's Self-Rating Depression Scale(SDS) in order to evaluate the quantitative and qualitative aspects of their depression. Mean depression scores and also scores of various depressive items obtained from the each group were statistically analyzed. 1. The mean SDS scores were 41.73±9.09 for stand-by replacements, 37.97±7.80 for the regulars and 38.31±7.79 for the controls. The differences of the mean SDS scores between stand-by replacements and the regulars and also between the stand-by replacements and the controls were noted to be significant(p<.0.001). However, no significant differences in the mean SDS scores between the regulars and the controls were found. 2. Among the various depressive items, retardation was most remarkable in the stand-by replacements which was followed by diurnal variation. In the regulars, confusion was most remarkable which was followed by diurnal variation. In the controls, diurnal variation was most remarkable which was followed by retardation. 3. There were statistically significant differences between the three depressive equivalent symptoms(pervassive affects, physiological equivalents, psychological equivalents) for each three group(p<0.001) except the control group, which showed no significant differences between the physiological equivalents and the psychological equivalents. 4. For each of the three depressive symptoms, statistically significant differences were found between the stand-by replacements and the control group(p<0.001, p<0.005, p<0.001) or the regulars(p<0.05, p<0.001, p<0.001). However, there were no significant differences between the regulars group and the control group.
김제헌,문창권,Kim, Je-Heon,Mun, Chang-Gwon 한국재료학회 1997 한국재료학회지 Vol.7 No.5
유리섬유와 에폭시 수지와의 계면전단강도에 미치는 수분흡수, 섬유직경 및 섬유의표면상태 등의 영향을 검토하기 위해서 two fiber fragmentation 시험법을 사용하였다. 그리고 유리섬유/에폭시 수지의 일방향 복합재료에서 수분흡수가 복합재료의 기계적 성질에 미치는 영향에 대해서도 검토하였다. 그 결과, two fiber fragmentation시험에서 계면전단강도는 수분흡수량 및 섬유직경이 클수록 작게 나타났으며, sizing한 것이 desizing한 것보다 크게 나타났다. 또 수분흡습에 의해 감소되었던 계면전단강도는 건조에 의해서 처음의 값의 약 50-60%까지 회복됨을 나타내었다. 그리고 일방향 복합재료의 인장강도는 수분흡수량이 증가함에 따라 현저히 감소함을 보였다.
Metal-Organic Decomposition법에 의한 강유전성 $YMnO_3$ 박막의 제조 및 특성
김제헌,강승구,김응수,김유택,심광보 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.7
The ferroelectric YMnO3 thin films were prepared by MOD(metal-organic decomposition) method with Y- and Mn-acetylacetonate as starting materials. Thin films were grown on various substrates by spin-coating technique. The crystalline phases of the thin films were identified by X-ray diffractometer as a function of heat-treatment temperature, pH of coating solution and substrate. In addition, the effect of Mn/Y molar ratio(0.8~1.2) on the formation of hexagonal-YMnO3 phase was investigated. In forming highly c-axisoriented hexagonal-YMnO3 single phase, the Pt coated Si substrate was more effective than the bare Si substrate, and the optimum heat-treatment condition was at 82$0^{\circ}C$ for 30 min. Higher Mn/Y molar ratio within 0.8~1.2 and pH of YMnO3 precursor solution within 0.5~2.5 favored formation of ferroelectric hexagonal phase rather than orthorhombic phase. Leakage current density of the hexagonal-YMnO3 thin film formed on Pt(111)/TiO2/SiO2/Si substrate was low enough as 0.4~4.0$\times$10-8(A/$\textrm{cm}^2$) at 5 V and its remanent polarization(Pr), calculated from the P-E hysteresis loop, was 3 nC/$\textrm{cm}^2$.
Pt/$TiO_2$/$SiO_2$/Si 기판 위에 제조된 $YMnO_3$박막의 강유전 특성에 미치는 ${Y_2}{O_3}$버퍼층의 영향
김제헌,강승구,은희태 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.11
MOD(Metal-Organic-Decomposition)법에 의해 $Y_2$O$_3$버퍼층에 Pt/TiO$_2$/SiO$_2$/Si 기판 위에 제조한 후, 그 표면 위에 졸-겔 방법으로 YMnO$_3$박막을 형성하였다. 기판의 종류와 수화조건 변화가 YMnO$_3$박막의 결정화 거동에 미치는 영향을 고찰하였으며, 또한 $Y_2$O$_3$버퍼층 유.무에 따른 Mn의 산화상태를 확인하고 이에 따른 유전특성 변화를 연구하였다. $Y_2$O$_3$버퍼층을 삽입하지 않고 직접 기판 위에 형성한 YMnO$_3$박막의 결정상은 기판의 종류 및 Rw 변화에 관계없이 orthorhombic 구조임이 확인되었다. 반면, $Y_2$O$_3$버퍼층 위에 형성된 YMnO$_3$박막의 경우에는 Rw($H_2O$/alkoxide mole ratio)가 0~6 범위 내에서 낮아질술고 hexagonal 결정상 성장에 유리하였으며, 또한 Pt(111)/TiO$_2$/SiO$_2$/Si 기판이 Ptd(200)/TiO$_2$/SiO$_2$/Si에 비하여 결정상 형성에 용이하였다. $Y_2$O$_3$버퍼층은 YMnO$_3$결정상 내에서 $Mn^{4+}$ 이온형성을 억제함으로써 누설전류밀도가 크게 감소되는 효과를 주었으며, 동시에 강유전 특성을 지닌 hexagonal 결정상 형성에 유리하게 작용하였다. 결론적으로, $Y_2$O$_3$는 Pt가 코팅된 Si 기판 위에 YMnO$_3$박막 제조시 그 강유전 특성을 향상시켜주는 우수한 버퍼층 재료임을 확인하였다.