Al2O3 has excellent sintering properties and is important in semiconductor manufacturing processes that require high-temperature resistance and chemical inertness in a plasma environment. In this study, a comprehensive analysis of the chemical characteristics, physical properties, crystal structure, and dispersion stability of three commercially available Al2O3 powders was conducted. The aim was to provide a technological foundation for selecting and utilizing appropriate Al2O3 powders in practical applications. All powders exhibited α-Al2O3 as the main phase, with the presence of beta-phase Na2O-11Al2O3 as the secondary phase. The highest Na+ ion leaching was observed in the aqueous slurry state due to the presence of the secondary phase. Although the average particle size difference among the three powders was not significant, distinct differences in particle size distribution were observed. ALG-1SH showed a broad particle size distribution, P162 exhibited a bimodal distribution, and AES-11 displayed a uniform unimodal distribution. Highconcentration Al2O3 slurries showed differences in viscosity due to ion release when no dispersant was added, affecting the electrical double-layer thickness. Polycarboxylate was found to effectively enhance the dispersion stability of all three powders. In the dispersion stability analysis, ALG-1SH exhibited the slowest sedimentation tendency, as evidenced by the low TSI value, while P162 showed faster precipitation, influenced by the particle size distribution.

최근 자연재해에 따른 도시내 피해규모가 증가하고 있는 상황에서, 기후변화 및 자연재해 등에 대응하는 회복탄력성 있는 마을(resilient community)에 대한 관심이 높아지고 있다. 이러한 관점에서 본 연구는 회복탄력성 개념과 기존의 마을만들기와 관련된 이론과 실질적 노력을 관련문헌과 마을만들기 사례 등을 통해 살펴보았다. 이를 통해 본 연구에서는 미래의 회복탄력성 있는 마을 만들기 위해 회복탄력성 있는 커뮤니티 계획개념(Resilient Community Planning Framework 또는 RCPF)을 제안하였다. RCPF는 복잡성과 다양성 그리고 미래의 불확실성을 마을만들기계획에 고려해야 한다는 것을 보여주고 있다. 이것은 경제적, 사회적, 환경적, 물리적 요소 그리고 계획과정에서의 다양한 주체의 참여에 영향을 받는다는 것으로 나타났다. 회복탄력성있는 마을만들기를 위해서는 RCPF를 구성하고 있는 주요소에 대한 종합적인 이해와 더불어 이러한 요소들이 상호연결되어 있음을 인지하고 마을만들기를 해야 한다는 것을 보여주고 있다.

The purpose of this study was to verify relationship between perceived coach-athlete fit and psychological needs satisfaction. Additionally, this study was conducted to examine whether there was significant difference between both variables in accordance with competence level that athletes perceive. For this, we collected responses about coach-athlete fit, basic psychological needs satisfaction, and perceived competence level from 197 Ssireum(Korean traditional wrestling) players. The result of analysis, coach-athlete fit generally had impact on psychological needs satisfaction. Specially, as athletes felt that their skill training method and characteristic trait were coincided with their coach, level of athletes` competence and relationship needs satisfaction were high. Futhermore, competence level influenced on perception of coach and athlete fit, partly because it moderated relationship between coach-athlete fit and psychological needs satisfaction. These results were discussed in terms of coach-athlete behavior fit of psychological process response based on Self-Determination Theory(SDT).