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권영훈,최준혁,정성욱 한국문화공간건축학회 2007 한국문화공간건축학회논문집 Vol.- No.19
In the study, structural analysis methods of museum exhibition spaces are reviewed from previous research, and the characteristics of each analysis method are analyzed so that an appropriate analysis approach can be selected for future research on museum exhibition spaces. The purposes of this study are: 1) to specify an application scope of analysis methods; and 2) to provide a direction for future research by better understanding structural analysis methods. For this study, various structural analysis methods used in previous research are analyzed and compared in terms of research themes, the characteristics of spatial structure, and the results derived by different analysis methods. As a result, the applicability and the meaningful interpretation of structural analysis methods of museum spaces are derived, and the need for improved analysis methods is suggested.
(1 – x)(Bi,Na)TiO3-x(Ba,Sr)TiO3 Lead-free Piezoelectric Ceramics for Piezoelectric Energy Harvesting
권영훈,신동진,고중혁 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.7
Lead-free piezoelectric (1 − x)(Bi0.5Na0.5)TiO3-x(Ba0.5Sr0.5)TiO3 (x = 0, 0.03, 0.06, 0.08, 0.12)ceramics were fabricated by using a conventional ceramic sintering method. The piezoelectric propertiesof (1−x)(Bi0.5Na0.5)TiO3-x(Ba0.5Sr0.5)TiO3 lead-free ceramics were investigated. The crystallinityand the microstructure of (1 − x)(Bi0.5Na0.5)TiO3-x(Ba0.5Sr0.5)TiO3 ceramics were observedemploying X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The morphotropic phase boundary (MPB) of the rhombohedral and the tetragonal phases was detectedat x = 0.08 by using the XRD patterns. In addition, the piezoelectric and the dielectricproperties of (1 − x)(Bi0.5Na0.5)TiO3-x(Ba0.5Sr0.5)TiO3 were characterized. A piezoelectric coefficientd33 of 118 pC/N, an electromechanical coupling factor kp of 35.17%, a generated output powerof 17.15 nW, and a figure of merit of 2.85 pm2/N were obtained.