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DIC, FEM을 이용한 탄소섬유 강화소재의 섬유방향과 응력확대계수의 상관관계 분석
김범수(Bumsu Kim),신호근(Ho Geun Shin),강현욱(Hyun-Wook Kang),이광호(Kwang-Ho Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
We obtained the stress intensity factors (SIFs) of carbon fiber reinforced plastic (CFRP) specimens of edge and center cracks using the displacement values measured by the digital image correlation (DIC) and finite element method (FEM). Tensile tests were conducted according to the fiber directions (0˚, 30˚, 45˚, 60˚) of the CFRP materials, and the displacements around the crack tip were measured through the DIC technique. From the displacement contours shown in the DIC, SIFs were obtained by the least square method (LSM). As compared the displacements obtained by finite element method (FEM) with the DIC method, the displacements and SIFs obtained by DIC and FEM were in good agreement with each other.
( Bumhee Yang ),( Hayoung Choi ),( Bumsu Shin ),( Sung Jun Chung ),( Hyun Lee ),( Hye Yun Park ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-
The impact of bronchiectasis on the occurrence of postoperative pulmonary complications (PPC) after extra-pulmonary surgery in patients with airflow limitation is not well elucidated. So, the aim of the present study was to investigate the impact of bronchiectasis on PPC following extra-pulmonary surgery in patients with airflow limitation. A retrospective analysis of 437 patients with airflow limitations, including 62 patients with bronchiectasis, was conducted. The overall rate of PPC was significantly higher in patients with bronchiectasis than in those without bronchiectasis (40.3% vs. 21.6%, p=0.001). The occurrence of pleural effusion (29.0% vs. 15.5%, p=0.009), atelectasis (19.4% vs. 9.9%, p=0.028), and acute exacerbation (8.1% vs. 1.3%, p=0.007) was significantly higher in patients with bronchiectasis than in those without bronchiectasis, while there were no significant differences in the occurrence of pneumonia and respiratory failure between the two groups. The analysis revealed that bronchiectasis was associated with increased PPC (adjusted odds ratio [OR]=2.73, 95% CI, 1.47-5.06, p=0.001), which was especially significant in patients who did not use bronchodilators (adjusted OR=3.24, 95% CI, 1.57-6.68, p=0.002). Our study indicates that bronchiectasis is associated with an increased risk of PPC following extra-pulmonary surgery in patients with airflow limitation, and bronchodilators may prevent PPC in these patients.
박재영(Park Jaeyoung),신창건(Shin Changgun),장범수(Chang Bumsu) 한국지반환경공학회 2010 한국지반환경공학회논문집 Vol.11 No.12
기초조사란 위험비탈면에 실시하는 정밀조사와는 달리 비탈면의 현황을 파악하고자 실시한다. 과거 기초조사자료를 토대로 하여 전국 국도변에 분포하고 있는 비탈면의 일반현황을 분석하였다. 또한 비탈면 일반 현황과 붕괴가 발생한 비탈면에 대한 비교분석을 통하여 유지관리 시 중요한 사항에 대하여 연구를 수행하였다. 10년 전 붕괴가 발생된 자료와 현재 붕괴된 자료를 통하여 비탈면 파괴 유형 및 대책공법의 적용에 대한 변화 추이를 분석하였다. 추후 원인별 붕괴형태 분석 및 대책공법과의 연관성을 연구하려 한다. Inventory survey is process collecting data about cut slope. It's different from inspection. Collected data are being used get at status about cut slope along national roads. And we analyse between current situation and data about collapse slope. It helps finding better method about maintenance of cut slope. We found changes in the situation between data at present and data at 10 years ago. We will research collapse and counterplan by cause.
Defect-Induced Epitaxial Growth for Efficient Solar Hydrogen Production
Zhang, Kan,Kim, Jung Kyu,Park, Bumsu,Qian, Shifeng,Jin, Bingjun,Sheng, Xiaowei,Zeng, Haibo,Shin, Hyunjung,Oh, Sang Ho,Lee, Chang-Lyoul,Park, Jong Hyeok American Chemical Society 2017 Nano letters Vol.17 No.11
<P>Epitaxial growth suffers from the mismatches in lattice and dangling bonds arising from different crystal structures or unit cell parameters. Here, we demonstrate the epitaxial growth of 2D MoS2 ribbon on 1D CdS nanowires (NWs) via surface and subsurface defects. The interstitial Cd-0 in the (1(2)over-bar10) crystal plane of the [0001]-oriented CdS NWs are found to serve as nucleation sites for interatomically bonded [001]-oriented MoS2, where the perfect lattice match (similar to 99.7%) between the(10(1)over-bar1) plane of CdS and the (002)-faceted in-plane MoS2 result in coaxial MoS2 ribbon/CdS NWs heterojunction. The coaxial but heterotropic epitaxial MoS2 ribbon on the surface of CdS NWs induces delocalized interface states that facilitate charge transport and the reduced surface state. A less than 5-fold ribbon width of MoS2 as hydrogen evolution cocatalyst exhibits a similar to 10-fold H-2 evolution enhancement than state of the art Pt in an acidi electrolyte, and apparent quantum yields of 79.7% at 420 nm 53.1% at 450 nm, and 9.67% at 520 nm, respectively.</P>