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An Electron Microscopic Investigation of the Structure of Thin Film Tin Oxide Material
Jeon, Eok-Gui,Choy, Jin-Ho,Choi, Q.-won,Kim, Ha-Suck Korean Chemical Society 1985 Bulletin of the Korean Chemical Society Vol.6 No.5
Morphological structure of tin oxide thin films was examined by transmission electron microscopy. TEM samples were prepared by chemical etching in hydrogen fluoride solution: firstly floating for 2-3 minutes in acid solution, then suspending on water found to be useful for the preparation of TEM samples. Electron micrographs showed the size of grains of the tin oxide crystal was dependent upon the temperature of the film preparation. Dopant concentration and heating time also influence the grain size. The resistivity of tin oxide material was explained by grain size and grain boundaries in a limited temperature and dopant concentration ranges.
전귀영 ( Gui Young Jeon ),강원석 ( Won Seok Kang ),이종길 ( Jong Gill Lee ) 고려대학교 세종경영연구소 2018 경상논집 Vol.38 No.1
본 연구에서는 현대 사회에서 여성의 경제 활동 참여율 증가에 따른 군 내에서의 여군 비율 증가 추세와 그에 상응한 여군 복지 정책의 변화를 점검 및 분석을 통해 효과적이고 경제적인 발전방향을 제시하고자 하였다. 이를 위해, 여성 친화 기업 및 군의 여성 복지 실태에 대한 선행 연구를 실시하고, 민간 여성 및 여군을 비교 대상으로 하여 직업 선정 가치관 및 여성 복지 분야 선호도에 관한 설문 조사를 통해 AHP 분석을 실시하였다. 그 결과 민간 여성과 군의 여성들은 모두 직업 선정 가치관과 상반되는 복지 분야에 대한 선호도가 높은 결과를 보였다. 여성들은 자신이 선택한 직업에서 추구하는 가치관을 잘 실현할 수 있는 분야뿐만 아니라 여성 복지 분야에 있어 전반적인 사항에 대한 혜택을 누리고자 하는 욕구가 있었다. 이에 따라 해 조직이 부족하게 시행되고 있는 분야에 대해 높은 선호도를 보이는 것으로 나타났다. 이를 통해 군에 비해 비교적 효율적으로 시행되고 있는 민간 기업의 사례를 적용함으로써 정책의 실효성 제고가 가능함을 시사 하였다. The purpose of this study is to propose an effective and economical development direction by examining and analyzing the trend of women 's participation rate, selection rate of female soldiers in the Army and the corresponding changes in women' s welfare policy in the modern society. For this purpose, AHP analysis was conducted by conducting a preliminary study on the welfare status of women - friendly enterprises and military, and by surveying the selection criteria of job selection values and women 's welfare preference in comparison with civilian women and female soldiers. The results of this study are as follows: Women in each groups showed high preference for the welfare field which is contrary to the job selection value. This implies that they have a desire for the overall female welfare regardless of their professional values, so even though the field of it which is highly relative to job selection values is well performed, they are still dissatisfied about the field which is insufficient and prefer it as the first. This suggests that the effectiveness of the policy can be improved by applying the case of the private company which is relatively efficient compared with the military. In addition, unlike previous studies comparing military cases in foreign countries, it is possible to apply the creative welfare policies of women selected as women-friendly enterprises more effectively to the military by comparing the characteristics of women engaged in business and female soldiers.
Thermal Properties of 0.9CaMgSi<sub>2</sub>O<sub>6</sub>-0.1MgSiO<sub>3</sub> Glass-Ceramics
Jeon, Chang-Jun,Sun, Gui-Nam,Lee, Jong-Kyu,Ju, Han-Sae,Kim, Eung-Soo The Korean Ceramic Society 2012 한국세라믹학회지 Vol.49 No.1
Dependencies of thermal properties on the crystallization behavior of $0.9CaMgSi_2O_6-0.1MgSiO_3$ glass-ceramics were investigated as a function of heat-treatment temperature from $750^{\circ}C$ to $950^{\circ}C$. The crystallization behavior of the specimens depended on the heat-treatment temperature, which could be evaluated by differential thermal analysis (DTA), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD) analysis by the Rietveld-reference intensity ratio (RIR) combined procedure. With an increase of the heat-treatment temperature, the thermal conductivity and thermal diffusivity of the heat-treated specimens increased. These results could be attributed to the increase of crystallization with heat-treatment temperature. However, the specific heat capacity of the heat-treated specimens was not affected by the heat-treatment temperature. The thermal conductivities measured from $25^{\circ}C$ to $100^{\circ}C$ were also discussed for application to lighting-emitting diode (LED) packages and substrate materials.
전귀,류영기 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.5
공기분리용 고분자 다층복합막을 제조하였다. 코팅물질로는 poly(dimethylsiloxane)과 poly-4-methyl-1-pentene이 사용되었다. 다공성 지지체로는 polysulfone막이 사용되었다. 제조된 막에 대해 압력 및 코팅층의 두께비 변화에 따른 산소와 질소의 투과실험을 행하였고 이를 저항모델에 적용하여 막의 구조, 투과도와 선택도 사이의 관계를 해석하였다. 저항모델로 예측된 투과도 계수와 ideal separation factor 값은 실험치와 대체로 일치하였다. 막양단의 압력차가 5 ㎏/㎠이고 cut의 값이 0.05인 조건으로 ideal separation factor의 값이 3.4인 3층 복합막에 공기를 투과시킴으로서 약 34.5%의 산소부화공기를 얻을 수 있었고 이 때 산소에 대한 투과도는 1.9×10^(-5)[㎤(STP)/㎠·sec·㎝Hg]이었다. Multilayer types of thin film composite(TFC) membranes were prepared. Poly(dimethylsiloxane) and poly-4-methyl-1-pentene were used as a coating material and polysulfone was used for a porous support membrane. Permeation data of oxygen and nitrogen through TFC membranes at different pressure and thickness ratio of coating layer were obtained and the relationship between structure of membranes, permeability and selectivity were analyzed by applying resistance model. The values of permeability coefficient and ideal separation factor predicted by resistance model were well fitted with the experimental data. Oxygen was enriched up to 34.5% in the permeate stream under the condition that pressure difference and cut were 5 ㎏/㎠ and 0.05 respectively. The ideal separation factor of this three-layer TFC membrane was 3.4 and the permeability of oxygen was 1.9×10^(-5)[㎤(STP)/㎠·sec·㎝Hg].