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Reduction of Negative Bias and Light Instability of a-IGZO TFTs by Dual-Gate Driving
Sejin Hong,Suhui Lee,Mativenga, Mallory,Jin Jang IEEE 2014 IEEE electron device letters Vol.35 No.1
<P>Stability under negative-bias-illumination-stress (NBIS) of dual-gate (top- and bottom-gate) amorphous-indium-gallium-zinc-oxide (a-IGZO) thin-film transistors is investigated. It is found that the negative threshold-voltage shift (ΔV<SUB>TH</SUB>) induced by NBIS is much smaller under dual-gate driving (when the two gates are electrically tied together) compared with single-gate driving. For a 20 nm-thick a-IGZO active layer, this is attributed to bulk accumulation, where electrons are accumulated across the entire depth of the active layer, which is responsible for the small negative ΔV<SUB>TH</SUB> after NBIS. Due to bulk accumulation, the Fermi level can be easily shifted by dual-gate driving as compared with the conventional single-gate driving, even after NBIS.</P>
Sejin Chun,Hyuntae Kim,Ji-Soo Song,Teo Jeon Shin,Hong-Keun Hyun,Jung-Wook Kim,Ki-Taeg Jang,Young-Jae Kim Asia Association for Disability and Oral Health 2022 International Journal of Disability and Oral Healt Vol.18 No.1
Congenital heart defects, dysmorphic facial features and intellectual developmental disorders (CHDFIDD) is an autosomal dominant hereditary disease caused by mutation in cyclin-dependent kinase 13 (CDK13) gene. It was first discovered in 2016 by exome sequencing of patients with congenital heart defects and now, more than 50 patients have been diagnosed for CHDFIDD since the initial discovery of the disease and the number is increasing every year. Dental manifestation of wide-spaced or peg-shaped teeth are reported in patients with CHDFIDD. This case report describes the dental treatment of a 5-year-girl with CHDFIDD under general anesthesia. Through clinical and radiographic examination, interproximal caries lesion on primary molars and severe attrition on primary incisors with deep bite were detected. Fibrous gingival hyperplasia on buccal interproximal area between lower right lateral incisor and canine was also observed. Considering the extensive treatment need and patient’s uncooperative behavior, we planned to do dental treatment under general anesthesia. Conservative resin restoration, stainless steel crown restoration and excisional biopsy were done. Dental treatment of patients with CHDFIDD is challenging due to poor cooperation. Preventive dental care including oral hygiene instruction, plaque control, dietary consultation and fluoride application are necessary for maintaining oral health and preventing the development and progression of dental caries.
SeJin Park,JungWon Jang,AhYoung Kim,Seungyeon Hong,Boram Yuk,YeWon Min,KyungA Park,Subin Park 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.6
Objective-This study aimed to examine the associations between depression and both coronary artery disease (CAD) and cardiovascular risk factors (CVRs) in Korean women. Furthermore, this study sought to determine whether depression was associated with use of healthcare services in women with CAD or CVRs. Methods-This cross-sectional study was conducted on 26,335 women who were aged 19 years or older, and who participated in the Korean National Health and Nutrition Examination Survey (2007-2014). Associations of prior diagnosis of depression with CAD and CVRs and with nonutilization of healthcare services were investigated. Results-Women with depression had a higher prevalence of CAD and CVRs including obesity, hypertension, dyslipidemia, and metabolic syndrome than those without depression. In addition, depression was significantly associated with nonutilization of healthcare services in women with most CVRs. Conclusion-Considering the high rate of comorbid depression with CAD or CVRs and the low levels of health service utilization in depressed patients, screening for common CVRs, such as obesity, hypertension, and dyslipidemia, should be provided for patients with depression in mental health care settings.
SeJin Park,Seungyeon Hong,Hyesue Jang,JungWon Jang,Boram Yuk,ChulEung Kim,Subin Park 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.4
Objective-People with depression often suffer from comorbid, chronic physical diseases. Little is known about how demographic characteristics such as age and sex influence the prevalence of chronic physical diseases comorbid with depression. Therefore, this study aimed to explore the age and sex differences in the prevalence of diverse, chronic physical diseases comorbid with depression. Methods-This cross-sectional survey were conducted with the participants (n=45,598) of the Korean National Health and Nutrition Examination Survey (KNHANES). Using log-binomial regression, age adjusted prevalence ratios (APR) of chronic physical diseases of participants with depression and those without depression were estimated for each sex and age group. Results-The APR of most chronic physical diseases were significantly higher among respondents with depression than those without depression. Chronic physical diseases that showed the highest APR were asthma in adult male respondents (APR=3.46) and adult female respondents (APR=2.19) and chronic renal failure in elderly male respondents (APR=8.36) and elderly female respondents (APR=1.94). Conclusion-Prevalence ratios of the chronic physical diseases comorbid with depression differed according to sex and age groups. Collaborative care strategies should be designed according to demographic characteristics of the population.
민세진 ( Sejin Min ),홍진주 ( Jinjoo Hong ) 한국경제학회 2021 經濟學硏究 Vol.69 No.1
본 연구는 고교 경제 교육의 현황과 차이 존재 여부를 파악하고, 교육 격차의 요인을 탐구하기 위해 특성화고와 예술 계열 특목고를 제외한 전국 고등학교를 전수조사하고 분석한다. 주요 결과는 첫째, 전체 고등학교 중 2019학년도 현재 2학년에 경제 과목이 개설된 학교는 27.4%이다. 둘째, 로짓 분석 결과 경제를 가르칠 교사의 존재가 설명변수 중 경제 개설에 미치는 양(+)의 한계 효과가 가장 크다. 이는 과목 개설에 공급측 요인이 강하게 작용하며, 경제 교사의 양성이 중요함을 시사한다. 셋째, 경제 교육의 차이가 지역별, 학교 규모별, 소득별, 성별로 존재함이 확인된다. 서울 및 대도시 소재의 학교로 규모가 클수록, 소득이 높을수록 경제 개설 가능성이 높으며, 여고인 경우 개설 가능성이 낮다. This paper studies the existence and the cause of difference in the high school economic education. The main results are the followings: First, as in 2019, 27.4% of the high schools provide the economics subject. Second, the marginal effect on the probability of the provision of the subject is biggest for the existence of the teachers who can teach economics. Third, the probability of the provision of the economics is significantly different depending on the area the school is located in, the size of the school, the household income level of the area, and the gender composition of the school.
Seungpyo Hong(홍승표),Sejin Kim(김세진),Donghyun You(유동현) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
A control policy of a fly-scale flyer’s kinematics for stable flight toward a destination in various flow fields is obtained through an integrated framework of computational fluid dynamics (CFD) and deep reinforcement learning (deep-RL). As the flyer gets smaller, high-fidelity CFD is required as substitute for modeling aerodynamics around a flapping wing because of its unsteadiness and nonlinearity. While coupling with deep-RL to gain a control policy, the main challenge of adopting CFD is to obtain sufficient amount of data required for deep-RL due to high computational cost. In order to overcome data deficiency, a novel data reproduction method is devised. The focal point of the method is to reproduce diversified and huge amount of data from original one in terms of learning while maintaining the system dynamics unchanged. To get a control policy that works in various flow fields, multiple flyers are released in the environments with different flow speeds and share their experience with a deep-RL network. The learned network is able to make a decision on the flyer’s kinematics in temporally and spatially varying flows. The superior performance of the control policy is demonstrated through performing aerobatics in the complex flow field with abrupt disturbances.