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플라이 애쉬를 이용한 다공성 코디어라이트의 합성 및 특성
김성진,방희곤,박상엽,Kim, Sung-Jin,Bang, Hee-Gon,Park, Sang-Yeup 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.6
Porous cordierite was synthesized by the mechano-chemical processing using fly ash. The phase evolution of cordierite was investigated as a function of processing variables such as milling time and sintering temperature. In this study, the phase transition path of cordierite from fly ash was followed by sapprine/spinel ${\to}$ mullite/spinel ${\to}{\alpha}$-cordierite. Porous cordierite fabricated after 32 h of milling time and sintering at $1150^{\circ}C$ showed relatively low thermal expansion coefficient ($2.5{\times}10^{-6}/^{\circ}C\;(25{\sim}1000^{\circ}C$)) and high porosity (75%).
김성진,김민회,서민철,Yeon-Gon Mo,Seung Wook Chang,이신두 한국정보디스플레이학회 2011 Journal of information display Vol.12 No.4
Herein, the integration of solution-processed polymer thin-film transistors (TFTs) that were fabricated using selective wettability through ultraviolet (UV) exposure into a reflective liquid crystal display is demonstrated. From the experimental results of energy-dispersive spectroscopy, the composition of carbon and fluorine enhancing the hydrophobicity in the polymer chains was found to play a critical role in the wetting selectivity upon UV exposure. The polymer TFTs fabricated through the wettability-patterning process exhibited long-term stability and reliability. This wetting-selectivity-based patterning technique will be useful for constructing different types of solution-processed electronic and optoelectronic devices.
김성진,이영호,박찬수,조윤숙 대한산부인과학회 1994 Obstetrics & Gynecology Science Vol.37 No.3
1988년 1월부터 1992년 12월까지 전주예수병원 산부인과에 내원한 61례의 자궁경관무력증 환자에 대하여 McDonald operation을 시행하여 다음과 같은 결과를 얻었다. 1. 자궁경관무력증의 수술빈도는 총 분만수 20,517례중 61례로 0.3%, 즉 336분만당 1례였다. 2. 환자의 평균연령은 29.9세였으며 25세에서 34세사이가 대부분이었다. 3. 수술전 환자의 평균 임신횟수는 3.5회였으며 과거 임신횟수가 많을수록 성공률이 낮아지는 경향을 보였다. 4. 자궁경관무력증의 원인으로 인공임신 중절수술이 가장 많았다(59.0%). 5. 수술후 태아생존율은 70.5%(43례)였으며 수술시기에 따른 성공률은 15-16주에 76.9%의 성공률을 보여 가장 높게 나타났다. 6. 수술 성공률은 자궁경관 개대가 적을수록 높았다. 7. 수술후 실패한 18례는 조기진통이 8례, 조기파막이 6례, 감염이 2례, 자궁내 태아사망이 1례, 출혈이 1례였다. 8. 수술후 분만방법은 질식분만이 53례(86.9%), 제왕절개술이 8례(13.1%)였으며 분만시기는 37주이후가 가장 많았다. 이상의 결과로 볼때 산과적 기왕력과 진찰을 중심으로 자궁경관무력증을 조기에 진단하여 적절한 시기에 수술을 시행하는 것이 바람직하며 경관개대가 2cm이하인 자궁경관무력증 환자에서 임신 14-16주에 McDonald operation을 시행할 때 성공율이 가장 높을 것으로 사료된다. This study was undertaken for the clinical analysis and evaluation of 61 patients with incompetent internal os of the cervix, who were admitted and trreated at the Chon-ju Presbyterian Medical Center from January 1988 to December 1992. The results of this study were as follows: 1. The incidence of this IIOC was 0.3% and mean age of IIOC patients was 29.9 years old. 2. The average number of gravida before operation was 3.5 and the success rate of operation was low at high gravida. 3. The significant contributary factor was previous history of the traumatic induced abortion (59.0%). 4. The postoperative fetal salvage rate was 90.5%(43 cases) and from 15th weeks to 16th weeks of gestation, the success rate of operation was 76.9% and these period revealed the highest success rate of operation. 5. When cervical dilatation was small, the success rate of operation was high. 6. The causes of failed operation (18 casees) were 8 cases of preterm labor and 6 cases of PROM, 2 cases of infection, 1 cases of IUFD, 1 case of bleeding. 7. The delivery methods after operation were via vaginval route in 53 cases (86.9%) and abdominal route in 8 cases(13.1%).