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하소온도변화에 따른 (Na,K)NbO<sub>3</sub>계 무연 압전세라믹스의 압전 및 유전특성
류성림,정광현,류주현,이병률,정영호,Ryu, Sung-Lim,Chung, Kwang-Hyun,Yoo, Ju-Hyun,Lee, Byung-Youl,Jeong, Yeong-Ho 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.9
In this paper, in order to develop lead-free piezoelectric ceramics, $(Li_{0.04}Na_{0.44}K_{0.52)(Nb_{0.86}Ta_{0.10}Sb_{0.04})O_3$ ceramics were fabricated with the variation of calcination temperature and sintering temperature. The ceramics couldn't be sintered at temperature less than $1110^{\circ}C$ and showed the highest density at calcination temperature of $800^{\circ}C$. Crystal structure of the ceramics showed pseudo-tetragonal phase. At the calcination temperature of $800^{\circ}C$ and sintering temperature of $1110^{\circ}C$, the optimal values of $density=4.64g/cm^3,\;kp=0.45,\;{\varepsilon}r=1336,\;d_{33}=254pC/N\;and\;Tc=335^{\circ}C$ were obtained.
류주현,이현석,정광현,정영호,Yoo Ju-Hyun,Lee Hyun-Seok,Chung Kwang-Hyun,Jeong Yeong-Ho 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.5
In this study, in order to develop low temperature sintering piezoelectric ceramics for LTCC (Low-Temperature Cofired Ceramic) multilayer piezoelectric actuator, PMW-PMN-PZT ceramics using $0.2wt%\; Li_2CO_3$ and $0.25wt%\;CaCO_3$ as sintering aids were investigated according to the varation of PMW substution. Composition ceramics could be sintered at $900^{\circ}C$ by adding sintering aids. As the amount of PMW substitution increased, the crystal structure of PMW-PMN-PZT ceramics moved from tetragonal phase to rhombohedral phase gradually, and MPB(Morphotrophic Phase Boundary) region appeared at 2 mol% PMW substitution. At the sintering temperature of $900^{\circ}C$, the density, electromechanical coupling factor(kp), mechanical quality factor(Qm), dielectric constant(${\epsilon}r$), piezoelectric constant(d33) and Curie temperature(Tc) of 2 mol% PMW substituted PMW-PMN-PZT ceramics showed the optimal values of $7.88g/cm^3$, 0.58, 1002, 1264, 352 pC/N and $336^{\circ}C$, respectively, for LTCC multilayer piezoelectric actuator application.
MnO<sub>2</sub> 첨가에 따른 무연 Bi(Na, K)TiO<sub>3</sub>-SrTiO<sub>3</sub> 세라믹스의 유전 및 압전 특성
이미영,류성림,류주현,정광현,정영호,홍재일,윤현상,Lee, Mi-Young,Ryu, Sung-Lim,Yoo, Ju-Hyun,Chung, Kwang-Hyun,Jeong, Yeong-Ho,Hong, Jae-Il,Yoon, Hyun-Sang 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.10
In this study, 0.96B $i_{0.5}$($Na_{0.84}$ $K_{0.16}$)$_{0.5}$Ti $O_3$ + 0.04SrTi $O_3$ + 0.3 wt% N $b_2$ $O_{5}$+0.2 wt% L $a_2$ $O_3$ + xwt % Mn $O_2$ were investigated as a function of the amount of Mn $O_2$ addition in order to improve dielectric and piezoelectric properties of Lead-free piezoelectric ceramics. With increasing the amount of Mn $O_2$ addition, the density, electromechanical coupling factor( $k_{p}$), piezoelectric constant( $d_{33}$, $g_{33}$) and curie temperature (Tc) showed the maximum value of 5.7 g/㎤, 38 %, 219 pC/N, 26 mVㆍm/N and 32$0^{\circ}C$ at 0.1 wt% Mn $O_2$ addition, respectively, and mechanical quality factor( $Q_{m}$ ) showed the maximum value of 158 at 0.3 wt% Mn $O_2$ addition.ddition.ion.n.
CaCO<sub>3</sub> 첨가에 따른 저온소결 PNW-PMN-PZT 세라믹스의 압전 및 유전특성
류주현,이상호,이창배,송현선,정광현,정영호,박덕원,Yoo, Ju-Hyun,Lee, Sang-Ho,Lee, Chang-Bae,Song, Hyun-Sun,Chung, Kwang-Hyun,Jeong, Yeong-Ho,Park, Durk-Won 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.3
In this study, in order to develop low temperature sintering ceramics for ultrasonic vibrator application, PNW-PMN-PZT system ceramics were manufactured according to the amount of CaCO$_3$ addition, and their piezoelectric, dielectric and microstructural characteristics were investigated. The ceramic specimens could be sintered at sintering temperature below 1000 $^{\circ}C$ due to the effect of Li$_2$CO$_3$-CaCO$_3$ liquid phase produced by the reaction of Li$_2$CO$_3$ and CaCO$_3$. At 0.2 wt% Li$_2$CO$_3$ and 0.25 wt% CaCO$_3$ added specimen sintered at 920 $^{\circ}C$, the density, electromechanical coupling factor(k$_{p}$), mechanical quality factor(Q$_{m}$) and dielectric constant showed the optimal value of 7.78 g/㎤, 0.49, 1396, and 1300, respectively, for ultrasonic vibrator application.ion.
Dae Young Cheung,Byung Ik Jang,김상욱,김지현,김현건,Jeong Eun Shin,윤원재,Yong Kang Lee,정광현,조수정,신현필,조선영,신운건,Kee Don Choi,김병욱,권중구,양희찬,권태근,Hyun Gun Kim,안동원,Kwang Bum Cho,Sun Hee Kim,Kyong Hwa Hwang,Hee Hyuk Im 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.3
The area of endoscopic application has been continuously expanded since its introduction in the last century and the frequency ofits use also increased stiffly in the last decades. Because gastrointestinal endoscopy is naturally exposed to diseased internal organsand contact with pathogenic materials, endoscopy mediated infection or disease transmission becomes a major concern in this field. Gastrointestinal endoscopy is not for single use and the proper reprocessing process is a critical factor for safe and reliable endoscopyprocedures. What needed in these circumstances is a practical guideline for reprocessing the endoscope and its accessories whichis feasible in the real clinical field to guarantee acceptable prevention of pathogen transmission. This guideline contains principlesand instructions of the reprocessing procedure according to the step by step. And it newly includes general information and updatedknowledge about endoscopy-mediated infection and disinfection. Multiple societies and working groups participated to revise;Korean Association for the Study of the Liver, the Korean Society of Infectious Diseases, Korean College of Helicobacter and UpperGastrointestinal Research, the Korean Society of Gastroenterology, Korean Society of Gastrointestinal Cancer, Korean Associationfor the Study of Intestinal Diseases, Korean Pancreatobiliary Association, the Korean Society of Gastrointestinal Endoscopy Nursesand Associates and Korean Society of Gastrointestinal Endoscopy. Through this cooperation, we enhanced communication andestablished a better concordance. We still need more researches in this field and fill up the unproven area. And our guidelines will berenewed accordingly.
유병인 ( Byung In Yoo ),이재형 ( Jae Hyung Lee ),김윤숙 ( Yun Sook Kim ),정광현 ( Kwang Hyun Jeong ) 동의대학교 스포츠과학연구소 2002 스포츠과학연구논문집 Vol.1 No.-
The purpose of this study is to investigate the pattern of sports tourism which modem tourists like according to their age type, living in the globalization and information age, and how it impacts on improving the quality of human`s life. And this study analyzes on the importance of sports tourism`s policy, therethrough this provides tourism industry of our country with a verifiable data. This data will be able to develop our tourism industry. This examines 498 general Busan citizens who have participated in the sports event activities or have watched the sports games. The results are summed up as follows. First, sports tourism`s pattern according to age is analyzed by χ2 analysis has a significant difference as a whole. Second, the importance of sports tourism industry`s policy according to the pattern of sports tourism has a significant difference as a whole. Third, the plan of sports tourism`s activation is to make a plan to propel sports marketing related with sports tourism, to select a special sports tourism zone, to develop various sports products, to unify the administration of sports tourism, to recognize the importance of sports tourism, and to train and ensure sports specialists.