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장재운 ( Jang Jae Woon ),윤지현 ( Yooa Ji Hyun ),김상효 ( Kim Sang Hyo ),안진희 ( Ahn Jin Hee ),이상우 ( Lee Sang Woo ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
This paper presents behaviors of PSC Integral Abutment Bridge having simple span considering skewing effects. The main object of this study is to evaluate the behavior of H-pile foundation on skewed integral abutment bridge by carrying out parameter studies. A coupling moment can be occurred on the bridge because of soil pressure acting on an abutment when skew is increasing. From the analysis results, combined stress, shear stress and displacement on an acute and obtuse angle parts are identified to confirm the coupling moment.
저온소결 8/65/35 PLZT 세라믹의 전기열량 효과
최승훈,라철민,류주현,Choi, Seung-Hun,Ra, Cheol-Min,Yooa, Ju-Hyun 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.10
In this study, in order to develop the composition ceramics with the excellent electrocaloric properties, 8/65/35 PLZT ceramics were fabricated by the conventional solid-state method with the addition of $Bi_2O_3$, CuO, $Li_2CO_3$ and the variation of sintering temperature from $930^{\circ}C$ to $990^{\circ}C$. The XRD pattern of all specimens indicated general perovskite structure and the rhombohedral phase were observed. Curie temperature ($T_c$) of all specimens was observed in the vicinity of about $190^{\circ}C$. Density, coercive field and remnant polarization of the specimen sintered at $950^{\circ}C$ was $7.55g/cm^3$, 8.895 kV/cm, $11.22{\mu}C/cm^2$, respectively. EC effect of PLZT ceramics was measured by indirect method and the temperature change ${\Delta}T$ due to the electrocaloric effect was calculated by Maxwell's relations. ${\Delta}T$ of ceramic sintered at $950^{\circ}C$ was $0.21^{\circ}C$ under application of 40 kV/cm at $190^{\circ}C$.