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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.
서주형,김한별 한국체육대학교 체육과학연구소 2022 스포츠사이언스 Vol.40 No.1
The purpose of this study was to investigate self-management strategies in daily life, competitions, and preparation for professional national Shooters. Moreover, as participants in the study, five former and current national shooters who won medals at the World Championships and Olympic Games were selected. Through in-depth interviews, an effective approach was used to investigate the various meanings of the research phenomenon by analyzing the differences in self-management strategies based on the athletic ability and game level for each athlete. For the in-depth interview, a semi-structured interview questionnaire was prepared in advance, and the content and method of the question were flexibly conducted according to the situation of the field. Moreover, comprehensive questions were asked to inquire about additional necessary contents according to the purpose of the study. The conclusion of the research and data analysis of such professional shooters self-management strategy are as follows. First, the body management strategies were categorized into diet control, injury prevention and treatments, conditioning, and menstrual cycle status management. Second, the mental management strategies were categorized into positive thinking, confidence, concentration enhancement, emptying mind, overcoming anxiety and tension control, stress, image training, self-talk, and one's own behavior routine. Third, the life-style management strategies were categorized into regular life, life moderation, religious life, and sleep control. Fourth, the training management strategies were categorized into physical strength training, technical training, personal training method and reinforcement training. Fifth, the interpersonal relationships management strategies were categorized into teamwork, acting exemplary, not caring about others, and maintaining good relationships with leaders. Sixth, the effects of self-management strategies of professional shooters were categorized into positive and negative effects.
운전자 목 상해 최소를 위한 에어백 커버 설계에 관한 연구
서주형(Juhyung Seo),오주환(Juhwan Oh),김서홍(Seohong Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The NHTSA(National Highway Traffic Safety Administration) has published a legislative rule called FMVSS208 which requires applying the advanced airbag system. This rule regulates the neck injury rigidly in the aspect of dummy injuries. It means an introduction of the neck injury criteria Nij that is one of the most interesting subjects to safety system suppliers. To develop the airbag system that protects out-of-position occupants, it is necessary to clearly understand the neck injury and design an airbag system that reduces the neck injury. In this paper, we analyzed the effect of driver airbag cover shapes on the neck injury and proposed an optimized driver airbag cover design.