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Sangwon Lee,Sungwook Park,Sungchul Kim,Yongwoo Jeon,Kichan Jeon,Jun-Hyun Park,Jaechul Park,Ihun Song,Chang Jung Kim,Youngsoo Park,Dong Myong Kim,Dae Hwan Kim IEEE 2010 IEEE electron device letters Vol.31 No.3
<P>An extraction technique for subgap density of states (DOS) in an n-channel amorphous InGaZnO thin-film transistor (TFT) by using multifrequency capacitance-voltage (<I>C</I> -<I>V</I>) characteristics is proposed and verified by comparing the measured <I>I</I>- <I>V</I> characteristics with the technology computer-aided design simulation results incorporating the extracted DOS as parameters. It takes on the superposition of exponential tail states and exponential deep states with characteristic parameters for <I>N</I> <SUB>TA</SUB> = 1.1 × 10<SUP>17</SUP> cm<SUP>-3</SUP> · eV<SUP>-1</SUP>, <I>N</I> <SUB>DA</SUB> = 4 × 10<SUP>15</SUP> cm<SUP>-3</SUP> · eV<SUP>-1</SUP>, <I>kT</I> <SUB>TA</SUB> = 0.09 eV, and <I>kT</I> <SUB>DA</SUB> = 0.4 eV. The proposed technique allows obtaining the frequency-independent <I>C</I>-<I>V</I> curve, which is very useful for oxide semiconductor TFT modeling and characterization, and considers the nonlinear relation between the energy level of DOS and the gate voltage <I>V</I> <SUB>GS</SUB>. In addition, it is a simple, fast, and accurate extraction method for DOS in amorphous InGaZnO TFTs without optical illumination, temperature dependence, and numerical iteration.</P>
SangWon Jeon,HongEuy Lim,Seoyoung Yoon,KyoungSe Na,YoungHoon Ko,SookHaeng Joe,YoungHoon Kim 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.3
Objective-Although Type D personality has been associated with the prognosis of various cardiac diseases, few studies have investigated the influence of Type D personality on the cardiac and psychiatric prognoses of patients with atrial fibrillation (AF). Methods-Depression, anxiety, and quality of life were measured at baseline and 6 months. The recurrence of AF was measured during 1-year following radiofrequency catheter ablation (RFCA) for AF. The Kaplan-Meier method with log-rank tests were used to compare the cumulative recurrence of AF. ACox proportional hazard model was conducted to identify factors that contribute to the recurrence of AF. Results-A total of 236 patients admitted for RFCA were recruited. Patients with a Type D personality had higher levels of depression and anxiety and a poorer quality of life compared to controls. Although depression, anxiety, and quality of life had improved 6 months after RFCA, significant differences in psychiatric symptoms remained between patients with and without Type D personality. In the Cox models, the type of AF was the only factor that influenced the recurrence of AF. Conclusion-Our results suggest that Type D personality predominately influences psychological distress in patients with AF, but not the recurrence of AF.
Perspectives on the Happiness of Community-Dwelling Elderly in Korea
SangWon Jeon,Changsu Han,Jongha Lee,JaeHyoung Lim,HyunGhang Jeong,MoonHo Park,YoungHoon Ko,ChiUn Pae,SeungHyun Kim,SookHaeng Joe,David C. Steffens 대한신경정신의학회 2016 PSYCHIATRY INVESTIGATION Vol.13 No.1
Objective-A community survey was performed to investigate the factors and perspectives associated with happiness among the elderly in Korea (≥60 years). Methods-Eight hundred volunteers selected from participants in the Ansan Geriatric study (AGE study) were enrolled, and 706 completed the survey. The Happiness Questionnaire (HQ), which asks four questions about happiness, was administered. To explore the relationship between happiness and depression, the Geriatric Depression Scale (GDS) and the Beck Depression Inventory (BDI) also were administered. Results-The participants’ average level of happiness, determined using a 100-mm visual analogue scale (VAS) of the HQ, was 64.7± 26.0. The happiest situations for most people were “getting together with family” (23.8%) and “living in peace with family members (well-being)” (13.2%). Frequent reasons for not being happy were “worsened health condition” (28.7% of the not-happy group), “economic problems of their own” (16.5%), and “economic problems of their children” (14.8%). The participants’ choices regarding the essential conditions for happiness were “good health” (65.3%) and “being with family” (20.5%). The BDI and GDS scores were negatively related to the happiness score. A preliminary scale [Happy (Haeng-Bok, 幸福) aging scale] based on the HQ for measuring the happiness level of the Korean elderly was suggested for follow-up studies. Conclusion-The most important factors determining the happiness of the community-dwelling elderly in Korea were good family relationships, economic stability, and good health. A higher depression score negatively impacted happiness among Korean elders. Further studies on the factors in their happiness are required.
Sangwon Lee,Jae-An Jeon,Sang-Eui Lee The Korean Society for Composite Materials 2023 Composites research Vol.36 No.3
The sandwich structure, consisting of a core and a face sheet, is used for lightweight structural application. Generally, cellular structures like honeycomb, foam, and lattice structures are utilized for the core. Among these, lattice structures have several advantages over other types of structures. In other studies, curved lattice structures were reported to have higher mechanical properties than straight structures by converting shear stresses acting on the structure into compressive stresses. Moreover, the addition of vertical struts can have a positive effect on the mechanical properties of the lattice structure. For the purpose, two lattice structures with Circle Arch (CC) and Circular Arch with a vertical column (CC_C) were studied, which were fabricated by using selective laser sintering was conducted. The result showed that CC_C has dramatic performance improvements in specific strength, modulus, and strain energy density compared to CC, confirming that vertical struts played a significant role in the lattice core. Finite element analysis was employed to determine the cause of the stress behavior of CC and CC_C. This study is expected to help design structurally superior lattice cores and sandwich structures.
데이터 그리드를 위한 Peer-to-Peer 기반 복제 정책
오상원(Sangwon Oh),이원주(Wonjoo Lee),전창호(Changho Jeon) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.2Ⅰ
데이터 그리드를 위한 기존의 복제 정책은 계층적 구조를 기반으로 하고 있기 때문에 상위계층에서 하위계층으로만 데이터를 복제할 수 있어 비효율적이다. 따라서 본 논문에서는 기존 데이터 그리드의 계층적 구조에 P2P(Peer-to-Peer)시스템을 적용하여 효율적으로 복제본을 유지할 수 있는 새로운 복제정책을 제안한다. 이 정책의 특징은 클라이언트 노드의 저장 공간 일정 부분을 임계 구역(critical section)으로 지정하여 데이터 조작을 방지함으로써 클라이언트 노드도 데이터 복제본을 저장할 수 있는 기능을 가지도록 한 것이다. 따라서 계층적 구조에서 상위 계층뿐만 아니라 동일 계층 또는 클라이언트 노드들 간의 데이터 전공이 가능하기 때문에 데이터 그리드의 성능을 향상시킬 수 있다.
Hyejin Jeon,Jongmoon Jang,Sangwon Kim,최홍수 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.2
In this study, we present a piezoelectric artificial basilar membrane (ABM) composed of a 10-channel aluminum nitridebeam array. Each beam varies in length from 1306 to 3194 μm for mimicking the frequency selectivity of the cochlea. Tocharacterize the frequency selectivity of the ABM, we measured the mechanical displacement and piezoelectric outputwhile applying acoustic stimulus at 100 dB sound pressure level in the range of 500 Hz–40 kHz. The resonance frequenciesmeasured by mechanical displacement and piezoelectric output were in the range of 10.56–36.5 and 10.9–37.0 kHz,respectively. In addition, the electrical stimulus was applied to the ABMs to compare the mechanical responses in air andfluid. The measured resonance frequencies were in the range of 11.1–47.7 kHz in the air and 3.10–11.9 kHz in the fluid. Understanding the characteristics of the ABM is important for its potential use as a key technology for auditory prostheses.