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劉永喆 한국잠사학회 1985 한국잠사곤충학회지 Vol.27 No.2
The studies on the reaction of Urea·Formaldehyde(UF) resin with silk fabric were studied, and the final results summarized as below; 1. The pH and UF molar ratio for preparing liquid resin was found at pH 4-5 and UF molar ratio 1:2 and above. 2. The weight gains were increased with respect to increase in concentration of UF resin solution,while moisture regains were decreased. 3. The weight gains were signifcant high in case of wet pick up 70%. 4. The weight gains were increased with respect to increase in curing temperature and the amount of catalyst((NJI4)2SO4) found was 2.5% on the weight of Dimethylol urea and Hydrochloric acid was 1%, Tartaric acid was 10%. 5. The effect of different catalyst on wash fastness of UF resin was good where as in case of acidic catalyst was significantly high. 6. The weight gains with different catalyst was high where as in case of potential acid catalyst was significantly high. 7. The crease recovery are increased with the increase of the weight gain of silk fabric and also stiffness are increased.
유영철 서울행정학회 2011 한국사회와 행정연구 Vol.22 No.1
The Republic of Korea is to be multi-cultural nation as registration population was up to 2% in 2010. Immigrants who are economic and social minorities in almost country have different identities from each other. Therefore, it is necessary to study immigrant policy systematically with respect to social integration and immigration settlement. Firstly, I analyzed authority. projects. and budget by the laws on the immigrants and multi-cultural families. In addition, ordinances based on the laws were also viewed as overlapping and contradictory. There were many similarities between two fundamental laws. Although the charged ministry was changed, fiscal change among the related ministries was tardy. Wide variance of local budget each year limited policy autonomy. There was no difference among the related ordinances, but there were a few contradictions between the laws and the ordinances. Secondly, while the immigrant policies has been formed by central governments and the operation of this policy has been implemented by multiple agencies of central governments, agencies of central governments should be integrated then decentralized to local governments to prevent repetitious work done by different departments and enhance organization efficiency. When the agency will be integrated and decentralized in the earliest time possible, organization conflict and wasting budget can be reduced. To prepare for the decentralization. it is suggested that local governments reengineer appropriate departments as a governance structure and assign metropolitan council and local governments separate tasks.
유영철,김석환,김유정,박기호,Young Cheol Yu,M,D,Seok Hwan Kim,M,D,Yu Jeong Kim,Ki Ho Park,M,D 대한안과학회 2007 대한안과학회지 Vol.48 No.1
Purpose: To compare the rebound tonometer with the TonoPen for measuring the intraocular pressure (IOP) in rats Methods: Chronic IOP elevation models were induced unilaterally in nine Sprague-Dawley rats by applying an argon laser to the trabecular meshwork. IOP was measured before laser treatment and at one, two, and three days following laser treatment. Two independent operators collected five readings of the rebound tonometer and the TonoPen. Correlation analysis and comparison with the Bland & Altman method were performed. The intraclass correlation coefficient of each measurement and the difference between two independent operators were calculated. Results: The IOP values measured with the rebound tonometer were well correlated with those of the TonoPen (r=0.676, p<0.001); however, the mean difference expressed as the percent difference of the averages of two tonometers, was 27.5%. The IOP values measured with a rebound tonometer exhibited a significantly higher intraclass correlation coefficient (0.966; 95% CI, 0.945-0.980 vs 0.412; 95% CI, 0.264-0.581) and a lower difference between the two operators (3.10±2.17 mmHg vs 6.17±5.17 mmHg) than those of the TonoPen. Conclusions: Although the IOP values measured with the rebound tonometer were lower than those of the TonoPen, they were in good agreement and were less variable than those of the TonoPen.
유영철 대한정치학회 2014 大韓政治學會報 Vol.22 No.1
2000년 6.15 남북정상회담과 더불어 중립화통일론이 집중적으로 제기되고 있다. 이 와 관련하여 2000년 이후에 제기된 중립화통일론의 특징에 대하여 알아보고자 하였 다. 이를 위해, 시대적 배경과 관련한 특징, 중립화의 모델, 중립화 보장국, 중립화통 일에 대한 주체와 관련하여 현정권 해체냐, 존립이냐의 문제, 중립화통일을 위한 전제 조건(여건조성), 중립화통일을 위한 중간단계로 총선거를 통하느냐, 국가연합의 과도기 적 단계를 거치느냐의 문제, 중립화통일의 정부형태를 단일국가로 하느냐, 연방국가로 하느냐의 문제, 중립화통일의 정치체제, 중립화통일의 과정과 관련하여 선통일 후중립 화냐, 선중립화 후통일이냐의 문제에 대하여 분석해 보고자 하였다.
단층 다결정실리콘 EEPROM의 Endurance 특성 개선을 위한 소거방법
유영철,장성준,유종근,이광엽,김영석,박종태,Yu, Yeong-Cheol,Jang, Seong-Jun,Yu, Jong-Geun,Lee, Gwang-Yeop,Kim, Yeong-Seok,Park, Jong-Tae 대한전자공학회 1999 電子工學會論文誌, D Vol.d36 No.6
$0.8{\mu}m$ 표준 CMOS 공정을 이용하여 단층 다결정 실리콘 EEPROM을 설계$0{\cdot}$제작하였다. 프로그램 및 소거특성을 분석한 결과 프로그램 시간은 약 10 ms이하였으나 소거시간이 약 100 ms로 큰 것을 알 수 있었다. 소거시간을 개선하기 위하여 여러 가지의 소거방식을 사용하였다. 그리고 프로그램과 소거시 산호막에 포획된 전자로 인하여 endurance 특성이 나빠지는 것을 개선하기 위하여 소스/드레인 두단자를 통한 소거방법을 이용하였다. 그 결과 단층 다결정 실리콘 EEPROM의 endurance 특성이 기존보다 훨씬 개선된 것을 알 수 있다. In this work, single-poly EEPROM was designed and fabricated by using standard $0.8{\mu}m$ CMOS process. From the results of programming and erasing characteristics, it was found that the programming time was smaller than 10ms and the erasing time was about 100ms. To reduce the erasing time, several erasing methods were performed. The S/D erasing method was used to improve the endurance characteristics which was degraded due to electron trapping in programming and erasing cycles. By using the S/D erasing method, the more improved endurance characteristics then conventional one was obtained.