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김유석,류주현,Kim, YouSeok,Yoo, JuHyun 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.6
$MnO_2$-doped $0.985[Li_{0.04}(Na_{0.545}K_{0.46})_{0.96}(Nb_{0.81}Ta_{0.15}Sb_{0.04})]O_3+0.015KNbO_3(0.985LNKNTS+0.015KNbO_3)$ lead-free ceramics were fabricated by conventional solid state method to develop excellent dielectric and piezoelectric properties. The result of X-ray diffraction patterns obviously indicated that all of the specimen has pure perovskite structure without secondary phase. In addition, orthorhombic phase and coexistance region of orthorhombic-tetragonal phase (MPB) were observed with amount of $MnO_2$. The optimal values of ${\rho}$=4.70 $g/cm^3$, $d_{33}=238$ pC/N, $k_P=0.46$, $Q_m=121$, ${\varepsilon}_r=849$, and $T_C=225^{\circ}C$ were obtained at 0.01 mol% $MnO_2$ doped $0.985LNKNTS+0.015KNbO_3$ ceramics sintered at $990^{\circ}C$ for 5 h, respectively. Hence, it was indicated that the suitable amount of $MnO_2$ could improve the electrical properties of $0.985[Li_{0.04}(Na_{0.545}K_{0.46})_{0.96}(Nb_{0.81}Ta_{0.15}Sb_{0.04})]O_3+0.015KNbO_3$ ceramics.
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김유석,김순기,조인창,고진수,이경인,민승기 대한요로생식기감염학회 2015 Urogenital Tract Infection Vol.10 No.2
Purpose: We researched microbial profiles and the antimicrobial resistance profile of wound infection of the pelvic area in Korea for the recent 5 years in order to provide useful information on the choice of adequate drugs in the treatment of pelvic wound infection.Materials and Methods: We retrospectively analyzed 211 pelvic wound culture samples and their antimicrobial resistance in 198 in- or out-patients of the Urology and Plastic surgery department from January 2010 to December 2014.Results: Of the total samples, Staphylococcus aureus was isolated most frequently (35.3%), followed by Escherichia coli (15.1%), Staphylococcus epidermidis (12.6%), Staphylococcus haemolyticus (12.6%), Staphylococcus lugdunensis (8.4%), Pseudomonas aeruginosa (6.7%), Enterococcus spp. (4.2%), and Streptococcus spp. (3.3%). There were no notable changes of bacterial distribution for 5 years. For Gram-positive isolates, the oxacillin resistance rate for Gram-positive bacteria was 42.6% and showed an increasing tendency for the recent 5 years. Piperacillin, rifampicin, and vancomycin had low resistance for Gram-positive bacteria. Carbapenems, piperacillin/tazobactam had low resistance for Gram-negative bacteria. The Gram-positive organisms were more sensitive to many antibiotics in contrast to the Gram-negative organisms. Conclusions: Of varied causative organisms and susceptibility of the pelvic wound site, the most frequently infected organisms of the pelvic area were S. aureus, followed by E. coli. The methicillin resistive S. aureus (MRSA) incidence showed a tendency to increase yearly, thus selection or early change of antibiotics considering MRSA is recommended if the antibiotic response is poor. Gram-negative bacteria has a higher resistance rate compared with Gram-positive bacteria and had carbapenems and piperacillin/tazobactam.
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소성 온도가 (Na,K,Li)(Nb,Sb,Ta)O<sub>3</sub> 세라믹스의 유전 및 압전 특성에 미치는 영향
김유석,류주현,홍재일,이지영,Kim, You-Seok,Yoo, Ju-Hyun,Hong, Jae-Il,Lee, Jie-Young 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.11
In this study, $(Na_{0.525}K_{0.443}Li_{0.037})(Nb_{0.883}Sb_{0.08}Ta_{0.037})O_3+0.10\;wt%Bi_2O_3+0.35\;wt%B_2O_3$ ceramics were prepared by conventional soild-state sintering process. The specimens were sintered at temperature range from $1,060^{\circ}C$ to $1,100^{\circ}C$. XRD (X-ray diffractron), SEM (scanning electron microscope) were used to analyze the crystal structure and microstructural sproperties of specimens. And also, $T_{O-T}$, TC were observed by the mesurement of temperature dependence of dielectric constant. Excellect physical properties of the piezoelectric constant $d_{33}$= 170 pC/N, electromechanical coupling factor kp= 0.312, Tc= $315^{\circ}C$ were obtained, respectively, from the specimen sintered at $1,080^{\circ}C$.
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김유석,류주현,정영호,이지영,Kim, You-Seok,Yoo, Ju-Hyun,Jeong, Yeong-Ho,Lee, Jie-Young 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.11
In this study, electrocaloric effects of Pb-free $(Ba_{0.85}Ca_{0.15})(Ti_{0.92}Zr_{0.08})O_3$ ferroelectric ceramics were investigated and discussed using the characteristics of P-E hysteresis loops at wide temperature range from room temperature to $140^{\circ}C$. The remnant polarization $P_r$ and coercive field $E_c$ were decreased with increasing temperature. The temperature change ${\Delta}T$ by the electrcaloric effect was calculated by Maxwell's relations, and reached the maximum of ~0.15 at $120^{\circ}C$ under applied electric field of 30 kV/cm.
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