Graphite was diffusion-bonded by hot-pressing to W-25Re alloy using a Ti interlayer. For the joining, a uniaxial pressure of 25 MPa was applied at 1600 oC for 2 hrs in an argon atmosphere with a heating rate of 10 oC min−1. The interfacial microstructure and elemental distribution of the W-25Re/Ti/Graphite joints were analyzed by scanning electron microscopy (SEM). Hot-pressed joints appeared to form a stable interlayer without any micro-cracking, pores, or defects. To investigate the high-temperature stability of the W-25Re/Ti/Graphite joint, an oxy-acetylene torch test was conducted for 30 seconds with oxygen and acetylene at a 1.3:1 ratio. Cross-sectional analysis of the joint was performed to compare the thickness of the oxide layer and its chemical composition. The thickness of W-25Re changed from 250 to 20 μm. In the elemental analysis, a high fraction of rhenium was detected at the surface oxidation layer of W-25Re, while the W-25Re matrix was found to maintain the initial weight ratio. Tungsten was first reacted with oxygen at a torch temperature over 2500 oC to form a tungsten oxide layer on the surface of W-25Re. Then, the remaining rhenium was subsequently reacted with oxygen to form rhenium oxide. The interfacial microstructure of the Ti-containing interlayer was stable after the torch test at a temperature over 2500 oC.

The effect of a-sexithiophene(α-6T) layers on the light emitting diode (LED) were studied. The α-6T was used for a buffer layer in electroluminescent (EL) devices. Enhanced carrier (hole) injection and improved emission efficiency were observed. Carrier injection characteristics were investigated as a function of α-6T later thickness. The efficiency of the electroluminescence was proportional to the thickness of α-6T layer. The highest efficiency was observed 600A of α-6T later, which was about 1.5 times higher than that of device without α-6T later. The device with a-6T showed an operation voltage lowered by 2V. The α-6T layer can substitute hole blocking layer, and control charge injection properties.

In this study, a new conducting materials, namely, a Schiff base (polymeric azomethine) was synthesized from 2,6-diamino-N-docosyl pyridinium bromide and terephthalaldehyde to obtain a soluble and fusible conducting polymer. The synthesized Schiff base structure was analyzed by using UV/vis absorption spectrophotometer, FT-IR spectrometer and 1H-NMR spectrometer. It was found that the Schiff base was successfully synthesized and soluble in carbon tetrachloride(CC14), its Langmuir-Blodgett film was easily fabricated, and its surface pressure was determined to be 30mN/m for solid state by measuring π-A isotherm.

본 연구는 교사의 직무만족도에 대한 개인적 교사효능감과 집단적 교사효능감의 주효과와 상호작용효과를 분석하는데 그 목적이 있다. 구체적으로 개인적 교사효능감과 집단적 교사효능 감이 교사의 직무만족도 각 하위요인과 어떠한 관련성을 보이는지를 비교 분석하였으며, 직무만 족도에 대한 개인적 교사효능감과 집단적 교사효능감의 상호작용 효과를 검증하였다. 종속변수 와 관련되는 교사의 인구학적 변인을 통제한 후, 두 차원의 교사효능감이 교사의 직무만족도에 미치는 설명효과를 비교하기 위해 일련의 위계적 중다회귀분석(hierarchical multiple regression) 을 실시하였다. 그 결과 직무만족도의 7개 요인중 동료애와 교직의식은 두 차원의 교사효능감 과 모두 유의한 정적 관련성을 가지고 있었다. 그리고 발전성과 혁신성은 개인적 교사효능감에 만 관련되었고, 보상, 자율성, 업무부담 완화는 집단적 교사효능감에만 관련되었다. 마지막으로 두 차원의 교사효능감이 상호작용 효과를 보였던 직무만족도 요인은 보상뿐이었다. 이러한 결 과들이 교사의 직무만족도를 높이기 위한 정책에 시사하는 바가 논의되었다