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농촌 노인 추적조사에서 생활습관이 총사망률에 미치는 영향
박찬향,이충원,고복상 대한가정의학회 2002 Korean Journal of Family Medicine Vol.23 No.10
60∼64세의 일부 농촌 거주자에서 혼란변수로 작용할 수 있는 성별, 연령, 과거 및 현재의 만성병력, 교육, 일상활동제한을 다중지수회귀분석으로 통제한 후 사망의 위험을 증가시키는 생활습관은 흡연과 수면시간이며 TV 시청시간과 운동은 중요한 습관이 아니라는 것을 알 수 있었다.
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인장 및 반복하중하의 균열선단 전위거동과 미세균열 전파의 직접관찰
장영원,박찬향,정호철,이종수 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.10
An in-situ electron microscope study has been conducted to characterize the fracture and crack tip deformation behavior of metals under tensile and cyclic loading in a transmission electron microscope (TEM). The results show a number of new findings regarding the dislocation behavior near the tip and its relationship to the mode of crack propagation. Dislocation emission at the crack tip was found to depend strongly on the geometry of plastic zone, which contains a dislocation-free-zone(DFZ) just ahead of the crack tip. The difficulty of dislocation emission was, in turn, manifested by the fracture toughness. These experimental results were then compared to the theoretical analysis based on the DFZ model of fracture. Furthermore, this in-situ method has been extended to study the cyclic loading on the behavior of crack-tip-generated dislocations. It is found that dislocations emitted from a crack tip during tensile loading can be retracted and annihilated partially upon unloading. The change of plastic zone, dislocation distribution, and the DFZ during the retraction process were carefully examined using a TV/video camera. Their consequent impact on the crack propagation were then discussed in connection with the previously proposed dislocation theory of fracture and dislocation shielding for a moving crack.
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BLT (Bi3.25La0.75Ti3O12) 박막의 결정립 배향성이 잔류 분극과 누설 전류에 미치는 영향
서주형,오상호,박찬향 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.11
Effect of grain orientation on the electrical polarization and leakage current characteristics of Bi_(3.25)La_(0.75)Ti₃O_(12) (BLT) thin films was investigated in terms of c-axis off alignment. The c-axis epitaxial and various c-axis off aligned BLT films have been successfully grown by using different electrode materials (Pt and SrRuO₃) and heat-treatments. In order to evaluate the crystallinity and the film texture of various c-axis off-aligned BLT thin films, X-ray diffraction (XRD) and transmission electron microscopy (TEM) were carried out. BLT thin film grown on the SrRuO₃/SrTiO₃ (100) substrate revealed that its c-axis aligned completely parallel to the substrate normal, by developing cube-on-cube epitaxial relathionship with underlying SrRuO₃ film. The corresponding P-E curve showed nearly paraelectric property. The polycrystalline (117) and (014) oriented BLT films grown in this study were shown that their c-axis off alignment about growth direction increased by amount more than 50°. As the degree of c-axis off-alignment was increased, remanent polarization was increased due to the anisotropic polarization characteristic of BLT film, however, the surface roughness of BLT films was increased and it resulted in degraded leakage current characteristic. Therefore, grain orientation of BLT thin films is a crucial factor controlling the polarization properties and leakage current characteristics.
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가공 및 열처리에 따른 Ti-10V-2Fe-3Al 합금의 미세조직과 기계적 성질의 변화
장영원,이종수,김성주,박찬향 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.3
The relationship between microstructure and mechanical properties of the near-βTi-10-V2Fe-3Al alloy has been investigated. Microstructural variations were made by either changing heat treatment or imposing the thermomechanical processing prior to heat treatment. In the β-solution treated(ST) and aged structure, brittle fracture occurred during the tensile tests, presumably due to the precipitations of fine secondary a particles in the metastable β matrix. The presence of primary a in the (α+β)-ST and aged structure represented high ductility, about 10%. The increase in ductility was, however, limited by the formation of thick grain boundary α-film. Thermomechanical processing was found to be effective in increasing yield and tensile strength of the alloy. In order to get a good combination of strength and toughness it is thus, suggested that microstructure should be modified not to contain any grain boundary α, but to contain globular primary αin small β grains.
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