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실외용 절연 재료 개발을 위한 에폭시 복합재료의 망목 구조 개질에 관한 연구
김재환,손인환,김탁용 광운대학교 신기술연구소 1997 신기술연구소논문집 Vol.26 No.-
옥외용 절연재료를 개발하기 위하여, 에폭시 수지에 SIN(상호침입망목) 구조를 도입하여 내환경성을 연구하였다. 단일망목 시편(E 계열)은 에폭시 수지로만 제작하였고, 상호침입망목 시편(EM 계열)은 일차망목으로 에폭시 수지, 이차 망목으로 메틸메타아크릴수지로서 제작하였다. 충진제 함량에 따라 10종의 시편을 제작하여, 시편의 망목구조 변화를 확인하기 위하여 주사전자 현미경으로 내부 구조를 관찰하였다. 그리고 교류전압절연파괴강도를 측정하였다. 또한, 내환경성을 측정하기 위하여 자외선 조사 실험과 트래킹 실험을 하였다. 그 결과, 내부 구조의 변화를 확인할 수 있었고, 상호침입망목 구조 시편이 단일망목 시편보다 내환경성이 우수함을 확인하였다. In order to develop outdoor insulating materials, SIN(simultaneous interpenetrating polymer network) was introduced to epoxy resin and the environment resistance was investigated. The single network structure specimen(E series) formed of Epoxy resin alone and simultaneous interpenetrating polymer network specimen (EM series) in which epoxy resin was taken as the first network and methyl methacrylate resin as the second network were manufactured. Ten kinds of specimens were manufactured by filler (SiO_2) content. SEM were utilized in order to confirm their network structure changes, and AC voltage dielectric strength was measured. Also, UV-test and tracking test were carried out to investigate the environment resistance characteristic. Therefore the variations of network structure were happened as a result of SEM test, and it was confirmed that simultaneous interpenetrating polymer network specimens were more excellent than single network structure specimens.
김재환,김미아,이대우,백병주,양연미,김재곤 大韓小兒齒科學會 2014 大韓小兒齒科學會誌 Vol.41 No.4
DNA extraction is a prerequisite for the identification of pathogens in clinical samples. Commercial DNA extractionkits generally involve time-consuming and laborious multi-step procedures. In the present study, our modified DNA isolation method for saliva samples allows for the quick detection ofpathogens associated with dental caries or periodontitis by PCR within 1 h. To release DNA from the bacteria, 1min of boiling was adequate, and the resulting isolated DNA can be used many times and is suitable for longterm storage of at least 13 months at 4℃, and even longer at -20℃. In conclusion, our modified DNA extraction method is simple, rapid, and cost-effective, and suitable forpreparing DNA from clinical samples for PCR for the rapid detection of oral pathogens from saliva. 구강 병원체의 검출 방법은 여러 가지가 있지만 그 중 PCR을 이용한 검출이 확실하고 빠른 방법으로 알려져 있다. PCR을위한 많은 DNA 추출법이 사용되고 있으나 상업적인 DNA 추출 kit들은 일반적으로 가격이 비싸고 절차가 여러 단계로 되어있으며, 그 외의 방법은 페놀과 클로로포름과 같은 유해한 화학물질을 써야하는 등의 단점이 있다. 이 연구에서 NaOH 용액을 이용한 개선된 DNA 추출 방법은 치아우식증, 치주염과 관련된 병원체를 빠르고 간단하며 비용-효율적으로 검출하였다. 세균으로부터 DNA를 추출하기 위한 boiling은 기존의 10분이 아닌 1분으로 충분하였고 4℃에서 최소 13개월 이상 DNA의 보관이 가능하였으며 sonication 유무에 따른 차이는 없었다. 따라서, 이 방법은 상업적인 kit나 유해한 화학물질을 쓰지 않고서도 타액 표본으로부터 직접적으로 빠른 시간 내에 DNA를 추출하여 병원체의 유무 결과를 확인하는데 매우 적합할 것으로 생각한다.
이상훈,김재환 大韓神經精神醫學會 1995 신경정신의학 Vol.34 No.4
This survey was conducted to reveal the frequency and severity of battering in a high school and to provide the fundamental data and understanding about battered children by their families. The sample was composed of 687 high school students(male 359, females 328) of which 485 students lived distant from the school and 179 ones near the school that located at rural area. to measure the frequency and severity of battering were administrated questionnaire and Straus' conflict resolution techniques scale(CTR). The results of this survey were as followed : The frequency of battering during the last year was 34.1%(females 37.9% ; males 30.6%) and the frequency of lifelong battering since after birth except last year was 82.2%(females 84.2% ; males 80.1%). About half of the sample(48.6%) had already experienced battering before the last year and one third(33.6%) has persistently experienced battering regardless of its severity. In the battering during last year, there were only a few new victims(0.4%). Only 17.4%, however, had not been battered until now at all. the most common batterer was father, mother, sibling, grandfather & grandmother and other relatives in order. Father was a more common batterer in the male students than in the female according to their growing up. There were no difference in the sociodemographic variables except sex, residence and father's occupation. Conclusively, although there were many limitations the authors found out that the frequency of battering in late childhood had been markedly decreased in a life but of severely battered students had been continuously sustained. considering the comprehensive plan for the persistently battered cases from early childhood with progression to late childhood, we suggest that further surveys on battering in late childhood battering should be necessary.
폴리에틸렌 테레프탈레이트에서 燒鈍 및 急冷이 熱剌激電流와 內部摩擦에 미치는 影響
金在煥 光云大學校 1984 論文集 Vol.13 No.-
In order to investigate the relaxation process of molecular chain segments on a polyethylene terephthalate above room temperature, the characteristics of internal friction and thermally stimulated currents were observed for the specimen as received and the others induced morphological changes by thermal treatments. As the results of comparative discussions on both characteristics, it is recognized that α peak of internal friction related to the C peak of TSC is being between 90 and 110[℃]. Thermal treatment brings about the change of crystallity, by the season of such result internal friction loss takes the change like the characteristic of TSC. When it is slow cooled or ice quenched after the thermal treatment, it is obtained that the activation energies are 0.7[eV] and 0.66[eV] respectively at maximum annealing temperature.