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Park, Sanghyun,Chun, Min Chul,Park, Solmin,Park, Ga-yeon,Jung, Moonyoung,Noh, Youngji,Ahn, Seung-Eon,Kang, Bo Soo Elsevier 2019 Current Applied Physics Vol.19 No.3
<P><B>Abstract</B></P> <P>Negative capacitance (NC) phenomena is recently suggested as a breakthrough that can lead to the improved transistor by decreasing the subthreshold swing. To understand the NC phenomena, we investigated the effects of the ferroelectric properties such as the remnant polarization depending on the switching cycles in Si-doped HfO<SUB>2</SUB> thin film capacitor. The ferroelectric properties were controlled by using the wake-up effect, in which the remnant polarization enhances as the number of switching cycles increase. The relation between the wake-up effect and the voltage drop region with the negative differential capacitance were elucidated. The dynamic hysteresis loops were fitted based on Landau-Khalatnikov equation, and the free energy as a function of polarization was obtained. The Landau coefficients showed that the double-well feature of the free energy becomes more apparent due to the wake-up. Based on the wake-up effect on NC phenomena, we show that the NC phenomena is well described by Landau-Ginzburg theory of ferroelectrics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Relation between negative capacitance and ferroelectric properties explained based on Landau theory. </LI> <LI> Wake-up effects explained based on Landau theory. </LI> <LI> Effective control of ferroelectric properties using wake-up effect. </LI> </UL> </P>
박문영 ( Park Moonyoung ) 국제뇌교육종합대학원 인성교육연구원 2023 인성교육연구 Vol.8 No.1
본 연구는 중등 영어교육 상황에서의 인성교육에 관한 국내 연구동향을 파악 하여 후속연구 방향을 제시하고 관련 연구를 촉진하기 위한 기초를 마련하는 것을 목표로 수행되었다. 연구대상은 2013년부터 2022년까지 출간된 국내 등재학술지 및 학위논문 18편이다. 연구시기에 따른 분석 결과 개정 교육과정과 인성교육진흥법이 공표된 2015년 전후로 인성교육과 관련한 활발한 연구가 진행되었다. 연구유형 분석에 실천연구가 가장 높은 비율을 나타내었는데 인성교육프로그램 개발 및 적용, 인성교육 방법 및 효과, 변인연구, 인성교육평가와 같은 연구가 진행되었다. 기초 연구에는 인성에 대한 인식 및 태도·실태 현황조사와 같은 연구가 수행되었다. 셋째, 연구대상 분석에 중고등학생, 현직 영어교사를 포함한 인적대상연구와 영어 교과서와 인성 관련 학술지 연구논문을 분석한 물적대상, 프로그램과 교수방법, 교육활동에 관한 연구가 다양하게 이루어지고 있었다. 연구 방법에 따른 영문학 텍스트나 다양한 교수학습방법 등을 활용한 수업지도안 개발을 목적으로 하는 질적연구가 가장 높은 비율을 나타내었다. 후속연구를 위한 제언으로 통합적인 기초연구와 실제 영어교육현장에서의 실험연구들과 교실을 넘어 가정과 사회 차원의 연계된 통합인성교육에 대한 깊이 있는 연구가 요구된다. This study examines current research trends in personhood education in secondary English education by reviewing literature published between 2013 and 2022. The study reveals that personhood education has received considerable attention since the introduction of a revised curriculum in 2015. Most of the research has focused on practical aspects such as program development and effective teaching methods. The research subjects include secondary students, teachers, textbooks, and journal articles. Qualitative research methods were widely used. These findings provide valuable insights for promoting personhood education among secondary English learners, guiding future research directions, and laying a strong foundation for further investigations in this field. The study recommends additional research in integrated foundational studies, experimental studies conducted in real classroom settings, and personhood education that extends beyond the classroom to encompass households and society.
Park, Choonghee,Choi, Wookhee,Hwang, Moonyoung,Lee, Youngmee,Kim, Suejin,Yu, Seungdo,Lee, Inae,Paek, Domyung,Choi, Kyungho Elsevier BV 2017 Science of the Total Environment Vol.584 No.-
<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Phthalates and bisphenol A (BPA) have been used extensively in many consumer products, resulting in widespread exposure in the general population. Studies have suggested associations between exposure to phthalates and BPA, and serum thyroid hormone levels, but confirmation on larger human populations is warranted.</P> <P><B>Methods</B></P> <P>Data obtained from nationally representative Korean adults (n=6003) recruited for the second round of the Korean National Environmental Health Survey (KoNEHS), 2012–2014, were employed. Three di-(2-ethylhexyl) phthalate (DEHP) metabolites, along with benzyl-butyl phthalate (BBzP) and di-butyl phthalate (DBP) metabolites, and BPA were measured in subjects' urine. Thyroxine (T4), total triiodothyronine (T3), and thyroid-stimulating hormone (TSH) were measured in serum. The associations between urinary phthalates or BPA and thyroid hormone levels were determined.</P> <P><B>Results</B></P> <P>Urinary phthalate metabolites were generally associated with lowered total T4 or T3, or increased TSH levels in serum. Interquartile range (IQR) increases of mono-(2-ethyl-5-oxohexyl) phthalate (MEOHP), and mono-(2-ethyl-5-hydroxyhexyl) phthalate (MEHHP) were associated with a 3.7% increase of TSH, and a 1.7% decrease of total T4 levels, respectively. When grouped by sex, urinary MEHHP levels were inversely associated with T4 only among males. Among females, mono-benzyl phthalate (MBzP) and mono-<I>n</I>-butyl phthalate (MnBP) levels were inversely associated with TSH and T3, respectively. In addition, negative association between BPA and TSH was observed.</P> <P><B>Conclusions</B></P> <P>Several phthalates and BPA exposures were associated with altered circulatory thyroid hormone levels among general Korean adult population. Considering the importance of thyroid hormones, public health implications of such alteration warrant further studies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Phthalates and bisphenol A were associated with thyroid hormones in Korean adults. </LI> <LI> DEHP metabolites were positively associated with TSH but negatively with total T4. </LI> <LI> Negative associations were found between BPA and TSH, and MnBP and total T3. </LI> <LI> Consequences of thyroid disruption warrant further investigations. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Moonyoung Chung,Hee-Jin Yang,Chul-Kee Park 대한신경외과학회 2022 Journal of Korean neurosurgical society Vol.65 No.5
October 2022 marks the 50th anniversary of the founding of Journal of Korean Neurosurgical Society (JKNS). Staring as official journal of Korean Neurosurgical Society (KNS) in 1972, JKNS is a journal that is listed in the science citation index (SCI) and its impact factor has been steadily rising in recent years. The past history of JKNS was reviewed with a focus on important milestone, and the direction of future development is suggested.
Moonyoung Jang,Minah Kim,Sunghyun Park,Ho Sung Myung,Sun Ha Paek,Jun Soo Kwon 대한신경정신의학회 2024 PSYCHIATRY INVESTIGATION Vol.21 No.6
Objective Obsessive-compulsive disorder (OCD) is a psychiatric condition that causes significant distress and social costs and often follows a chronic course with frequent relapses. Approximately 20% of patients do not respond to medication or cognitive behavioral therapy; gamma knife surgery (GKS) has been proposed as a treatment option for these patients. However, research on GKS for OCD patients is rare. Methods In this study, 10 patients with treatment-resistant OCD underwent GKS, and the treatment response and side effects were assessed. The improvement in patients’ obsessive-compulsive symptoms was evaluated using the Yale-Brown Obsessive Compulsive Scale (YBOCS) scores following GKS. Additionally, the characteristics distinguishing the groups with favorable responses to GKS from those with less favorable responses were examined. Results GKS was well tolerated, and patients demonstrated a statistically significant reduction in YBOCS scores before and after GKS (p=0.016). Patients that responded to GKS exhibited distinct characteristics from those who did not respond. Patients who responded poorly tended to present an earlier age of onset, a longer duration of illness, more frequent hospitalizations, poorer social functioning, and a greater incidence of suicide attempts/thoughts. Conclusion This study not only demonstrated that GKS is a safe and effective treatment method for intractable OCD but also revealed characteristics distinguishing patients who respond well to GKS from those who do not. These results may aid in the selection of patients for future application of GKS.