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HyoWon Kim,SooChurl Cho,BoongNyun Kim,JaeWon Kim,MinSup Shin,Yeni Kim 대한신경정신의학회 2009 PSYCHIATRY INVESTIGATION Vol.6 No.4
Objective-The objective of this study was to examine the effect of perinatal and familial risk factors on full syndrome and subthreshold attention-deficit/hyperactivity disorder (ADHD) among Korean children and adolescents. Methods-A sample of 2,673 students was randomly selected from 19 representative schools in Seoul, Korea. The parents of the students completed the Diagnostic Interview Schedule for Children-version IV (DISC-IV), as well as questionnaires on perinatal and familial risk factors. Results-Maternal stress and alcohol use during pregnancy, parental marital discord, parental separation or divorce, changes in primary caregivers, and notbreastfeeding were significantly associated with full syndrome ADHD; however, maternal stress during pregnancy was the only variable that differentiated subthreshold ADHD from non-ADHD. Conclusion-Our results provide evidence the perinatal and familial risk factors contribute to the development of ADHD in Korea children and adolescents, and suggest that these perinatal and familial risk factors are more closely related to full syndrome than to subthreshold ADHD.
Flexible artificial synesthesia electronics with sound-synchronized electroluminescence
Kim, Jong Sung,Cho, Sung Hwan,Kim, Kang Lib,Kim, Gwangmook,Lee, Seung Won,Kim, Eui Hyuk,Jeong, Beomjin,Hwang, Ihn,Han, Hyowon,Shim, Wooyoung,Lee, Tae-Woo,Park, Cheolmin Elsevier 2019 Nano energy Vol.59 No.-
<P><B>Abstract</B></P> <P>Visualization of human senses has been of great interest for developing an emerging interactive display that can artificially stimulate synesthesia with numerous unprecedented applications. Especially, visualization of various daily sound and music, which are much more complicated than human touch, in a form of flexible thin film devices can be a great challenge. We present flexible artificial synesthesia electronics that visualize continuous and complicated sounds. The electronic device is made of a thin composite film of a piezoelectric polymer for sound generation and inorganic electroluminescence (EL) microparticles for direct visualization of input sound signals. Field-induced EL of the microparticles in the device depends upon the source sound wave, making their EL synchronized with sound arising from the piezoelectric actuation. The flexible artificial synesthesia devices with sound-synchronized EL (FASSEL) showed extreme mechanical tolerance that can be repeatedly folded and crumpled with visible sound, allowing a variety of unexplored applications including synchronous sound-lightings and wearable, on-body sound-vision systems to facilitate emotional interaction of human being with sound in a human-friendly form.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ultra-flexible piezoelectric loudspeakers were developed with sound synchronized EL. </LI> <LI> Piezoelectric polymer composite with EL particles for direct visualization of sound. </LI> <LI> Artificial synesthesia of sound and vision via a single capacitive device platform. </LI> <LI> Silica-encapsulated-ZnS particle was employed for high EL with low leakage current. </LI> <LI> Extreme mechanical tolerance that can be repeatedly folded and crumpled. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
협력학습에서 대학생의 문제해결능력과 협력적조절능력 수준에 따른 팀효능감, 팀상호작용 및 만족도의 효과 검증
김효원(Kim, Hyowon),김희정(Kim, Heejung),김누리(Kim, Nooree) 학습자중심교과교육학회 2018 학습자중심교과교육연구 Vol.18 No.21
This study was conducted to examines the effects of university students problem solving and co-regulation level on team-efficacy, team-interaction and team activity satisfaction in collaborative learning. 296 students data were collected from 2 universities in Jeolla Province. The results of the study are as follows. First, there were significant difference among high, moderate, low problem solving and co-regulation level in team-efficacy, team-interaction and team activity satisfaction. Second, the results shows the significant interaction effects between university students problem solving and co-regulation level in team-efficacy and team activity satisfaction. That is to say, high problem solving level students were more higher team-efficacy when they perceive high and low co-regulation level than moderate level. also, similar pattern appeared in team activity satisfaction. However, low problem solving level students were more higher team-efficacy when they perceived moderate co-regulation level, while lower team activity satisfaction. It promotes the use of instructional designs and strategies for an effective teaching-learning experience in collaborative learning. 본 연구는 팀 기반 협력학습 시 대학생의 문제해결능력과 협력적조절능력 수준에 따라 팀효능감, 팀 상호작용과 만족도에 어떤 효과가 나타나는지를 살펴보고자 수행되었다. 이를 위해 전라도 소재 2개 대학교에서 2017년 2학기에 수업을 수강 하여 팀 기반 협력학습 과제를 수행한 학생 296명을 연구대상으로 하였다. 연구결 과는 다음과 같다. 첫째, 문제해결능력과 협력적조절능력에 따라 팀효능감, 팀 상호작용과 만족도에 유의한 차이가 나타났다. 둘째, 문제해결능력과 협력적조절능 력의 상호작용 효과는 팀효능감과 만족도에서 확인되었다. 문제해결능력이 높은 집단의 경우 협력학습에 대한 효능감은 협력적조절능력이 높을 때와 낮을 때가 보통일 때보다 상대적으로 높았으며, 협력학습에 대한 만족도 또한 이와 유사한 양상을 띄는 것으로 확인되었다. 반면 문제해결능력이 낮은 집단의 경우는 협력적조 절능력이 보통일 때 협력학습에 대한 효능감이 가장 높았으나 협력학습에 대한 만족도는 가장 낮은 것으로 나타났다. 이러한 연구결과에 근거하여 대학생의 효과적인 협력학습을 위한 교수․학습 전략에 대한 시사점을 제시하였다.
Buried oxide 구조 활용을 통한 1.2 kV SiC MOSFET의 Gate charge 특성 개선 연구
윤효원(Hyowon Yoon),김진훈(Jinhun Kim),김채윤(Chaeyun Kim),박영은(Yeongeun Park),김광재(Gwangjae Kim),김상엽(Sangyeob Kim),신강희(Kanghee Shin),박수민(Sumin Park),석오균(Ogyun Seok) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
A 1.2 kV SiC MOSFET with buried oxide structure to improve gate charge characteristics was proposed. To verify the performance of 1.2 kV SiC MOSFET with buried oxide, we analyzed electrical characteristics of devices according to width (WBO) and depth of buried oxide (TBO). As a result, the QGD of 1.2 kV SiC MOSFET with optimized buried oxide having WBO of 0.2 μm and TBO of 0.1 μm was reduced by 32.8 % than that of 1.2 kV SiC MOSFET with planar MOS structure.
김채윤(Chaeyun Kim),전국화(Gukhwa Jeon),윤효원(Hyowon Yoon),박영은(Yeongeun Park),김광재(Gwangjae Kim),김상엽(Sangyeob Kim),강규혁(Gyuhyeok Kang),신강희(Kanghee Shin),김동석(Dong-Seok Kim),석오균(Ogyun Seok) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
SiC MOSFET has excellent breakdown characteristics owing to high critical electric field. In addition, it is attracting attention as a power semiconductor for electric vehicle or satellite because it can miniaturize the power module due to its low on-resistance. Particularly in the space environment, the TID effects occur due to the influence of radiation, causing serious malfunctions of power devices. In this paper, SiC MOSFET and ntype MOSCAP were irradiated with proton to analyze effects of cosmic radiation. As a result of irradiating high-energy proton, a hole trap is created inside because of the TID effects. Because of the hole trap, the electrical characteristics such as threshold voltage, on-resistance, and breakdown voltage of the MOSFET were changed. In addition, as a result of extracting oxide characteristics by irradiating MOSCAP with the same conditions, it was verified that the fixed charge inside the oxide increased. Finally, the breakdown characteristic degradation mechanism was proved by edge termination simulation using TCAD. In this paper, the TID effects by irradiation is verified through experiments and simulations.