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Jae Won Oh,Il-Wook Cho,류미이,송진동 한국진공학회 2015 Applied Science and Convergence Technology Vol.24 No.3
InP/InGaP quantum structures (QSs) were grown on GaAs (001) substrates by a migrationenhanced molecular beam epitaxy method. Temperature-dependent photoluminescence (PL) and emission wavelength-dependent time-resolved PL (TRPL) were performed to investigate the optical properties of InP/InGaP QSs as a function of migration enhanced epitaxy (MEE) growth cycles from 2 to 8. One cycle for the growth of InP QS consists of 2-s In and 2-s P supply with an interruption time of 10 s after each source supply. As the MEE growth cycle increases from 2 to 8, the PL peak is redshifted and exhibited different (larger, comparable, or smaller) bandgap shrinkages with increasing temperature compared to that of bulk InP. The PL decay becomes faster with increasing MEE cycles while the PL decay time increases with increasing emission wavelength. These PL and TRPL results are attributed to the different QS density and size/shape caused by the MEE repetition cycles. Therefore, the size and density of InP QSs can be controlled by changing the MEE growth cycles.
Sodium-glucose Co-transporter 2 Inhibitors: a New Path for Heart Failure Treatment
Jaewon Oh,이승현,Chan Joo Lee,Seok-Min Kang 대한심장학회 2021 Korean Circulation Journal Vol.51 No.5
Results from cardiovascular outcome trials (CVOT) with 5 different sodium-glucose co-transporter 2 inhibitors (SGLT2i; empagliflozin, canagliflozin, dapagliflozin, ertugliflozin, sotagliflozin), initially developed for their glucose-lowering effect by blocking tubular glucose reabsorption in kidney, have been shown to decrease the risk of heart failure hospitalization (HFH) across a range of patients with and without atherosclerotic cardiovascular disease in patients with type 2 diabetes mellitus (T2DM). Following these CVOT results, SGLT2i (dapagliflozin, empagliflozin, sotagliflozin) also were reported to reduce HFH and cardiovascular death in patients with heart failure with reduced ejection fraction (HFrEF), regardless of existence or absence of T2DM. Ongoing studies have been conducted to evaluate the clinical benefit of SGLT2i (empagliflozin, dapagliflozin) in patients with heart failure with preserved ejection fraction (HFpEF). Although SGLT2i brought us to the entrance of a new era for prevention of HF incidence and worsening of HF, the search for pivotal mechanism of SGLT2i to improve our pharmacological armamentarium should continue in order to protect every HF patient from fatal progression of HF disease. In this review, we summarized the updated clinical evidences on SGLT2i (rather than basic and translational evidence) for reduction of HF risk in T2DM patients and favorable clinical outcomes in both HFrEF and HFpEF patients.
Jae-Won Oh,Chang-Ho Lee,Sup Hong,Dae-Sung Bae,Hui-Je Cho,Hyung-Woo Kim 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.3
This paper concerns the kinematic characteristics of a coupling device in a deep-seabed mining system. This coupling device connects the buffer system and the flexible pipe. The motion of the buffer system, flexible pipe and mining robot are affected by the coupling device. So the coupling device should be considered as a major factor when this device is designed. Therefore, we find a stable kinematic device, and apply it to the design coupling device through this study. The kinematic characteristics of the coupling device are analyzed by multi-body dynamics simulation method, and finite element method. The dynamic analysis model was built in the commercial software DAFUL. The Fluid Structure Interaction (FSI) method is applied to build the deep-seabed environment. Hydrodynamic force and moment are applied in the dynamic model for the FSI method. The loads and deformation of flexible pipe are estimated for analysis results of the kinematic characteristics.
Jaewon Oh,Dong Seok Kim,Mee-Yi Ryu 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
Increasing the size of grain is considered an essential factor for manufacturing high-efficiency perovskite (PS) solar cells [1]. The grain size of PS film strongly depends on annealing temperature and time. We investigated the structural and optical properties of PS film with different grains because of various annealing conditions. As the annealing temperature and time increased, the grain size in PS increase, and a vertically columnar grain was formed. The PS film annealed at 150℃ for 1 min sowed better properties compared with that annealed at 100℃ for 1 min.