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이유형,김도형,류주현,김인성,송재성,홍재일,Lee, Yu-Hyung,Kim, Do-Hyung,Yoo, Ju-Hyun,Kim, In-Sung,Song, Jae-Sung,Hong, Jae-Il 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.6
In this study, In order to improve dielectric and piezoelectric properties of Lead-free piezoelectric ceramics, $0.95(K_{0.5}Na_{0.5})NbO_3-0.05Li(Sb_{0.8}Nb_{0.2})O_3+0.2\;wt%Ag_2O+0.4\;wt%MnO_2+Xwt%CuO$ were investigated as a function of the amount of CuO addition. With increasing the amount of CuO addition, density was increased up to 0.4 wt.% CuO and then decreased above. And also, electro mechanical coupling factor ($k_p$) was decreased. At the 0.4 wt% CuO added specimen sintered at $1020^{\circ}C$, $k_p$, Qm, density, dielectric constant (${\varepsilon}_r$) and $d_{33}$[pC/N] showed the optimal value of $4.37\;g/cm^3$, 0.354, 305, 645, and 144 pC/N respectively.
이유형,김인성,송재성,류주현,서병호,오영광 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.41
In this study, the non-stoichiometric composition [(K0.5Na0.5)0.97(Nb0.96Sb0.04)] O3 + 0.8 mol%CuO + x mol% MnO2 + 0.2 wt% Ag2O ceramics were fabricated (where x = 0, 0.3, 0.6, and 0.9, respectively). Also, their dielectric and piezoelectric properties were investigated. For 0.6-mol% MnO2-doped [(K0.5Na0.5)0.97(Nb0.96Sb0.04)]O3 (abbreviated as KNNS) ceramics sintered at 1080 C the bulk density (ρ), the electromechanical coupling coefficient (kp), the mechanical quality factor (Qm), the dielectric constant (εr) and the piezoelectric constant (d33) showed excellent values of 4.453 g/cm3 and 0.438, 545, 404, and 80 pC/N, respectively.
류주현,이유형,김도형,이일하,권준식,백동수,Yoo, Ju-Hyun,Lee, Yu-Hyong,Kim, Do-Hyung,Lee, Il-Ha,Kwon, Jun-Sik,Paik, Dong-Soo 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.2
In this study, in order to develop low loss multilayer piezoelectric actuator, PZN-PZT ceramics were fabricated using $Li_2CO_3,\;Bi_2O_3$, CuO and ZnO as sintering aids, their structural, piezoelectric and dielectric characteristics were investigated according to the amount of ZnO addition, At the sintering temperature of $870^{\circ}C$, the density, electromechanical coupling factor(kp), mechanical quality factor(Qm), dielectric constant(${\epsilon}_r$) and piezoelectric constant($d_{33}$) of 0.4 wt% ZnO added specimen (sintered at $870^{\circ}C$) showed the optimum value of $7.812g/cm^3$, 0.535, 916, 1399, 335 pC/N respectively. Taking into consideration above piezoelectric properties of the specimen sintered at low temperature, it was concluded that PZN-PZT ceramics using 0.4 wt% ZnO as additive showed the optimum characteristics as the composition ceramics for low loss multilayer piezoelectric actuator application.
서종관,이유형,유명식 한국통신학회 2024 韓國通信學會論文誌 Vol.49 No.2
Residents of residential complexes often experience charging station hopping due to overnight charging competition, blind spots for charger location and parking space occupation. In this paper, a customized charger recommendation model is proposed for electric vehicle users, focusing on 7kW slow chargers. By analyzing the utilization rate of the charger is determined based on time slots. Additionally, the main charging hours and charging contribution rates are derived from users’ charging history. Simulation results show an enhanced performance of the recommended chargers compared to existing ones, validating the improvement in the success rate of charger recommendations.
에너지하베스팅 소자용 PZW-PMN-PZT 세라믹의 압전특성
정영호(Yeongho Jeong),남석호(Seokho Nam),김승래(Seungrae Kim),정주현(Juhyun Jung),류주현(Juhyun Yoo),이갑수(Kabsu Lee),이유형(Yuhyong Lee) 한국조명·전기설비학회 2009 한국조명·전기설비학회 학술대회논문집 Vol.2009 No.5월
In this study, in order to develop the composition of ceramics capable of being sintered at low temperature with high piezoelectric properties, PZW-PMN-PZT system ceramics for piezoelectric energy harvesting application were manufactured according to the amount of PZW addition. And also, their microstructural, dielectric and piezoelectric properties were investigated. At the sintering temperature of 930℃, a 5 ㏖% PZW substituted specimen showed a maximum value of density = 7.905g/㎤, kp = 0.585, d₃₃= 351 pC/N and Qm = 1,254, respectively.