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탄소나노튜브와 이온성 액체를 이용한 액추에이터 제조 및 특성연구
서미정,정연수,이정아,안형준,이준석,정영진,Seo, Mi-Jeong,Jung, Yeon-Su,Lee, Jeong-Ah,Ahn, Hyeong-Joon,Lee, Joon-Seok,Jeong, Yeong-Jin 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.1
Actuators of ionic electro-active polymer were prepared using single walled carbon nanotubes (SWNTs), poly(vinylidene fluoride-heaxafluoropropylene) (PVdF-HFP) and an ionic liquid. The effect of the composition of the electrode layer on the characteristics of the actuator was examined. The actuators were very light, flexible and bent largely at low voltages (IV). Overall, the maximum bending angle decreased with increasing amount of PVdF-HFP. The response time was also dependent on the type of ionic liquid. The actuator prepared with l-ethyl-3 methylimidazolium tetrafluoroboratre ($EMIBF_4$) operated faster and deformed morc than the one prepared with I-butyl-3-methylimidazolium tetrafluoroboratre ($BMIBF_4$) owing to its high ionic conductivity. Measurements of the voltage-displacement revealed the actuator made trom $EMIBF_4$ to have better linearity (recoverability). The composite actuator prepared in this study has potential applications ranging from micro switches to a11ificial muscles, robotics, etc..
Daisdzein이 Benzo(k)fluoranthene에 의한 CYP1B1 유전자조절 작용에 미치는 영향
서미정,김여운,신윤용,Seo, Mi-Jeong,Kim, Yeo-Woon,Sheen, Yhun-Yhong 한국환경성돌연변이발암원학회 2004 한국환경성돌연변이·발암원학회지 Vol.24 No.4
Cytochrome P4501B1(CYP1B1) is known to be inducible by xenobiotic compounds such as policyclic aromatic hydrocarbon(PAH) and dioxins such as 2,3,7,8-tetrachloro-dibenzo-p-dioxin(TCDD). And these induction of CYP1B1 is also regulated by many categories of chemicals. In order to investigate the effects of several chemicals on CYP1B1 gene expression in Hepa-I and MCF-7 cells, 5' flanking DNA of human CYP1B1 was cloned into pGL3 basic vector containing luciferase gene, and then transfected into these cells. After treatment of chemicals, the luciferase activity was measured. CYP1B1 enzyme metabolize PAHs and estradiol. CYP1B1 metabolize estradiol to 4-hydrozyestradiol that is considered as carcinogenic metabolite. Recent industrialized industrialized society, human has been widely been exposed to widespread environmental contaminants such as PAHs(polycyclic aromatic hydrocarbon) that are originated from the imcomplete combustion of hydrocarbons. PAHs are known to be ligands of the AhR(aryl hydrocarbon receptor). Induction of cytochrome P4501B1(CYP1B1) in cell culture is widely used as a biomarker for PAHs. Therefore we have studied the effect of PAHs in the human breast cancer cells MCF-7 to evaluate bioactivity of PAHs. We have used the United State of America EPA selected 13 different PAHs, PAHs mixtures and extracts from environmental samples to evaluate the bioassay system. We examined effects of PAHs on the CYP1B1-luciferase reporter gene and CYP1B1 mRNA level. Benzo(k)fluoranthene and dibenzo(a, h)anthracene showed strong response to CYP1B1 promoter activity stimulation, and also CYP1B1 mRNAs increase in MCF-7 cells in a concentration-dependent manner. RT-PCR analysis indicated that PAHs significantly up-regulate the level of CYP1B1 mRNA. Some flavonoids such as genistein, daidzein, chrysin, naringenin and morin were also investigeted. These flavonoids decreased B(k)F infuced luciferase activity at low concentration. But, these flavonoids exhibited stimulatory effect at high concentration.
들뢰즈 관점에서 본 영유아기 자녀양육경험을 통한 아버지-되어가기의 의미
서미정(Seo, Mi-Jeong),이연선(Lee, Youn-Sun) 부산대학교 교육발전연구소 2021 교육혁신연구 Vol.31 No.2
연구목적: 본 연구는 아버지의 양육을 존재론적 관점, 특히 들뢰즈의 실천철학에 근거하여 아버지 되어가기로 바라보고자 하였다. 영유아기 자녀를 가진 아버지들이 자녀 양육 과정에서 그들만의 아버지 되어가기의 의미를 생성하고 찾게 되는 것을 목적으로 한다. 연구방법: 만 0~5세 영유아기 자녀를 둔 아버지 4명을 대상으로 하여는 심층면담을 실시하였다. 연구결과: 첫째, 아버지들은 결혼 이전부터 아버지 존재에 대한 재인과 재현의 막연한 사유를 시작하고 있었다. 둘째, 아버지들이 가졌던 막연한 사유는 아이가 태어나는 순간 낯선 기호인 아이를 만나면서 끊임없이 변이와 생성을 시작하였다. 아내, 직장 상황, 아이 주체와의 실존적 만남 등이 변화를 이끌었다. 셋째, 아버지들은 한 인간으로서 주체를 포기하지 않고 아이와 함께 끊임없이 탈주의 틈새를 찾으며 함께 변이해 나갔다. 가족이라는 공동체는 개별적 주체로 존재하는 한편 함께 ageing하며 성장해 나가고 있었다. 그 과정은 노마디즘적 특성을 가지며 아버지-되어가기는 지극히 실존적이며 저마다 예측이 불가능하였다. 논의 및 결론: 첫째, 거대담론이나 사회적 분위기, 정책적 필요에 의해 바람직한 아버지가 유행처럼 이야기되고 있는 것은 아닌지 비판적 시각으로 살펴볼 필요가 있다. 둘째, 많은 제도와 장치가 아버지들의 자녀 양육을 지원하고 있으나 여전히 직장생활 등 아버지를 둘러싼 사회적 구조 속에서 아버지는 더딘 아버지 되어가기를 하고있다. 셋째, 현 시대의 요구와 사회적 분위기에 의해 특히 ‘친구 같은 아버지’가 좋은 아버지라고 부과된 역할이 각자의 맥락 속에서의 아버지 존재에 오히려 중압감으로 작용할 수 있음을 시사한다. Purpose: This study investigated the meaning of becoming-father based on the Deleuzian practical philosophy. The purpose of this study was to research the existential meaning of becoming-father in the process of child-rearing. Method: Participants were fathers who have children aged between o to 5. We collected data through in-depth interview. Results: First, fathers had a vague conception of being father coming from recognition and representation before marriage. Their wives, the working condition and the existential encounters with children leads transformation. Second, fathers had been experiencing continuous transmutation and beings from the moment their child was born. Third, the fathers were constantly looking for “crack to escape” with their children without giving up their beings as subject. The family community exists as individual agencies at the same time each of them have been aging and growing together. Conclusion: First, we must critically see whether the good father is being talked about in fashion within meta discourse. Second, in spite of various national policy supports for fathers, fathers took this slow to become fathers under surrounded by the social structure including working condition. Third, the image and informed role of ‘good father’ coming from the contemporary social demand and atmosphere could work rather as pressure on fathers.
서미정(Seo Mi Jeong),김경연(Kim Gyeong Yeon) 한국아동학회 2004 아동학회지 Vol.25 No.2
This study investigated personality and environmental variables influencing peer bullying by sex and by differences between bullies, victims, bully-victims, and normal children. Findings were that the proportion of the total sample involved in peer bullying was 47.88%. Of the bullying of both boys and girls was influenced by exposure to violence, delinquent friends, and peer support. Bullies had higher levels of aggression and exposure to violence than normal children and higher levels of peer support than victims. Victims had higher levels of delinquent friends and exposure to violence than normal children. Bully-victims showed higher levels of aggression, immaturity, delinquent friends, exposure to violence and lower levels of peer support than normal children.