V의 고용이 Malayaite의 결정 및 발색에 미치는 영향

주인돈,이병하,Joo, In-Don,Lee, Byung-Ha 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.4

This study aims to synthesize emerald-green malayaite pigments using $CaCO_3$, $SiO_2$, $SnO_2$ and $V_2O_5$. For this purpose, the optimum composition is $CaV_{0.25}Sn_{0.687}SiO_5$ and heating condition is at $1250^{\circ}C$ for 6 h of soaking time. The samples were characterized by X-ray diffraction (XRD), the Fourier Transform Infrared Spectrometers(FT-IR), the Raman Spectrometer, Scanning Electron Microscope(SEM) and the UV/Vis spectroscopy. The substituted V ion for Sn was observed to be quadrivalence. The analytical results of the synthesized pigment showed the tetragonal crystal, a typical form of Malayaite, and the particle size to be approximately $5{\sim}10\;{\mu}m$. The color in lime glaze added 12 wt% pigment was emerald green, and CIE Lab parameters are $L^*=67.73$, $a^*=-12.39$ and $b^*=9.28$.

친환경 재료를 사용한 흑색 지르코니아 세라믹스 제조

주인돈,이병하,Joo, In-Don,Lee, Byung-Ha 한국재료학회 2011 한국재료학회지 Vol.21 No.12

The goal of this investigation was to produce a zirconia-family black ceramics that has enhanced functionality and reliability. Color zirconia ceramics have been produced by adding pigments. Pigments cause structural defects within zirconia and result in a drop in physical properties. Using environmentally friendly rice husk, we produced a black zirconia that is free of structural defects. In optimal firing conditions for black zirconia the calcining temperatures of the molding product are changed from $400^{\circ}C$ to $1200^{\circ}C$, and the firing temperatures are changed from $1400^{\circ}C$ to $1600^{\circ}C$. Color of testing the specimens was analyzed using Ultraviolet (UV) spectroscopy. Scanning Electron Microscope (SEM), EDAX (EDX), and Fourier transform infrared spectroscopy (FT-IR) analyses were carried out in order to examine impregnation properties and crystal phases. Universial Test Machine (UTM) was used to measure the flexual strength as well as the compressive strength. From experimental results, it was found that in optimal firing conditions the sample was calcined from $1000^{\circ}C$ to $1500^{\circ}C$. Commission internationalde I'Edairage (CIE) values of manufactured black zirconia color were $L^*$ = 29.73, $a^*$ = 0.23, $b^*$ = -2.68. The bending strength was 918 MPa and the compressive strength was 2676 MPa. These strength values are similar to typical strength values of zirconia, which confirms that carbon impregnation did not influence physical properties.

SnO₂-TiO₂-V₂O₅계의 노랑안료 합성

주인돈,황동하,이현수,박주석,이병하,Joo, In-Don,Hwang, Dong-Ha,Lee, Hyun-Soo,Park, Joo-Seok,Lee, Byung-Ha 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6

The research was performed to find out the optimum firing condition for the $SnO_2-TiO_2-V_2O_5$ system yellow pigment. The pigment based on $SnO_2-V_2O_5$ system showed very intense yellow color and it was used widely in ceramics industry. Synthesized pigment, with partial substitutions of $SnO_2\;by\;TiO_2$, was fired at $1300{^{\circ}C}$ soaking 1h and it showed bright yellow color. $SnO_2-TiO_2-V_2O_5$ system was very more intensive changes in yellow color by colorimetric value $b^*$ than $SnO_2-V_2O_5$ system. Synthesized yellow pigments were characterized by X-ray diffraction (XRD), FT-IR, and UV-vis spectroscopy. The best composition for yellow pigment was 93:7:0.5(mole%) for $SnO_2-V_2O_5-TiO_2$. The measurement of CIE $L^*a^*b^*$ of pigment was $L^*(78.82),\;a^*(-4.88)\;and\;b^*$(59.25).

왕겨재를 사용한 Sphene - pink 안료의 합성

주인돈,이현수,이병하,Joo, In-Don,Lee, Hyun-Soo,Lee, Byung-Ha 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.3

This research examines using Rice Husk Ash, $Cr_2O_3$ in producing the pink-red color. It studies the formation of cassiterite and malayaite crystallites, the primary factors in producing the pink-red color, in relation to the application of $Cr_2O_3$ to examine its coloring mechanism. In addition, the research intends to identify the optimum synthesizing temperature and maintaining time for crystallization of malayaite, a stable pink-red colorization factor in high temperature glaze during $Cr_2O_3$-$SnO_2$-CaO-$SiO_2$ family pigment synthesis. The optimum substituting contents is Rice Husk Ash : Quartz = 1 : 2, and the optimum temperature is suggested at $1300^{\circ}C$ for 2 h based on analysis results by XRD, FT-IR, Raman microscope, SEM and UV-vis.

SnO2-TiO2-V2O5계의 노랑안료 합성

주인돈,이현수,박주석,이병하,황동하 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6

The research was performed to find out the optimum firing condition for the SnO2-TiO2-V2O5 system yellow pigment. The pigment based on SnO2-V2O5 system showed very intense yellow color and it was used widely in ceramics industry. Synthesized pigment, with partial substitutions of SnO2 by TiO2, was fired at 1300o C soaking 1h and it showed bright yellow color. SnO2-TiO2-V2O5 system was very more intensive changes in yellow color by colorimetric value b* than SnO2-V2O5 system. Synthesized yellow pigments were characterized by X-ray diffraction (XRD), FT-IR, and UV-vis spectroscopy. The best composition for yellow pigment was 93:7:0.5 (mole%) for SnO2-V2O5-TiO2. The measurement of CIE L*a*b* of pigment was L*(78.82), a*(−4.88) and b*(59.25). The research was performed to find out the optimum firing condition for the SnO2-TiO2-V2O5 system yellow pigment. The pigment based on SnO2-V2O5 system showed very intense yellow color and it was used widely in ceramics industry. Synthesized pigment, with partial substitutions of SnO2 by TiO2, was fired at 1300o C soaking 1h and it showed bright yellow color. SnO2-TiO2-V2O5 system was very more intensive changes in yellow color by colorimetric value b* than SnO2-V2O5 system. Synthesized yellow pigments were characterized by X-ray diffraction (XRD), FT-IR, and UV-vis spectroscopy. The best composition for yellow pigment was 93:7:0.5 (mole%) for SnO2-V2O5-TiO2. The measurement of CIE L*a*b* of pigment was L*(78.82), a*(−4.88) and b*(59.25).

한국형 출혈열의 심전도학적 고찰

조명찬,주인종,김대중,이병직,정형배,이명묵,박영배,최윤식,서정돈,이영우 대한내과학회 1990 대한내과학회지 Vol.38 No.3

We reviewed 549 electrocardiograms obtained from 95 patients with Korean hemorrhagic fever to investigate the incidence and electrocardiographic characteristics, observe evolutional changes in those findings during the course of illness, identify the correlations with clinical findings, and then suggest pathophysiologic mechanisms in the development of abnormal electrocardiographic findings. The overall incidence of electrocardiographic abnormalites was 95.7%, and the frequency of each phase was 87.8% in the febrile phase, 91.3% in the hypotensive phase, 86.5% in the oliguric phase, 76.4% in the diuretic phase and 43.0% in the convalescent phase. The cardinal electrocardiographic findings were QT prolongation(82.1%), sinus bradycardia(73.7%), prominent U wave(53.7%), tall and peaked T wave(51.6%), ST-T changes(41.1 %) and sinus tachycardia(35.8%). The most frequently observed electrocardiographic findings of each phase were sinus tachycardia in the febrile and hypotensive phase, QT prolongation in the oliguric phase, sinus bradycardia in the diuretic phase and prominent U wave in the convalescent phase. The occurrence of abnormal electrocardiograms increased in patients with high serum creatinine levels during the oliguric and diuretic phases. The electrocardiographic abnormalities that persisted to the convalescent phase were QT prologation(seven cases), prominent U wave(seven cases), sinus bradycardia(five cases), and tall and peaked T wave(four cases). Even though almost all of the electrocardiographic abnormalities were mild and recovered shortly after the convalescent phase and there were no diagnostic electrocardiograms, we observed noteworthy electrocardiographic characteristics and evolutional changes during the course of illness and suggested the primary electrocardiographic changes in Korean hemorrhagic fever.

공동주택의 성능기반설계 적용 방향

박지영 ( Park Ji-young ),천영수 ( Chun Young-soo ),이종윤 ( Lee Jong-yun ),주인돈 ( Ju In-don ),박광열 ( Park Kwang-yeol ) 한국구조물진단유지관리공학회 2015 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.19 No.1