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민병호,이종민,이지욱,염승준 대한건축학회 2006 대한건축학회논문집 Vol.22 No.1
The purpose of this research is to examine characteristics of the place that frequently used for gathering in external space of urban neighborhood, and to grope for design application plan. This research is based on the behavior observation and interview of southern area of Seoul and metropolitan area and we extracted 13 CBS for expected characteristics. In case of CBS, the dimension of space is relatively big, use of space is more complex, and the uses of resource have more diversity than non-CBS. Thus, environments have to assist the expansion, reduction and variation of gathering. Also, it is requisite to plan the space for various classes can mix. The status of CBS in the present urban neighborhood in Korea is has high degree of insecurity. The occurrences of CBS is 40.7 % in main targeted CBS place, this means behavior pattern s are also very insecure. This insecurity in present built urban neighborhood in Korea is the result of non-consideration of resources that can increase the CBS of residents, and absence of understanding in common interest of residents. For increasing community, it is important to find out the common interest of residents, also, from such common interest, survey the gathering behaviors, and find out resources that can bring out behaviors.
이가 양이온 금속 친환 및 유기 첨가제를 이용하여 분무열분해법으로 제조된 Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> 적색 형광체의 휘도 개선
민병호,정경열,Min, Byeong Ho,Jung, Kyeong Youl 한국분말야금학회 2020 한국분말재료학회지 (KPMI) Vol.27 No.2
The co-doping effect of aliovalent metal ions such as Mg<sup>2+</sup>, Ca<sup>2+</sup>, Sr<sup>2+</sup>, Ba<sup>2+</sup>, and Zn<sup>2+</sup> on the photoluminescence of the Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> red phosphor, prepared by spray pyrolysis, is analyzed. Mg<sup>2+</sup> metal doping is found to be helpful for enhancing the luminescence of Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>. When comparing the luminescence intensity at the optimum doping level of each Mg<sup>2+</sup> ion, the emission enhancement shows the order of Zn<sup>2+</sup> ≈ Ba<sup>2+</sup> > Ca<sup>2+</sup> > Sr<sup>3+</sup> > Mg<sup>2+</sup>. The highest emission occurs when doping approximately 1.3% Zn<sup>2+</sup>, which is approximately 127% of the luminescence intensity of pure Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup>. The highest emission was about 127% of the luminescence intensity of pure Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> when doping about 1.3% Zn<sup>2+</sup>. It is determined that the reason (Y, M)<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> has improved luminescence compared to that of Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> is because the crystallinity of the matrix is improved and the non-luminous defects are reduced, even though local lattice strain is formed by the doping of aliovalent metal. Further improvement of the luminescence is achieved while reducing the particle size by using Li<sub>2</sub>CO<sub>3</sub> as a flux with organic additives.