A5073254443- Hydrology and Watershed Management Studies
- Advanced DC-DC Converters
- Hydrology and Sediment Transport Processes
- Water Quality and Pollution Assessment
- Hydrological Forecasting Using AI
- Flood Risk Assessment and Management
- Soil and Water Nutrient Dynamics
- Advanced materials and composites
- Agriculture, Soil, Plant Science
- Multilevel Inverters and Converters
- Neurological disorders and treatments
- Fish Ecology and Management Studies
- Aluminum Alloys Composites Properties
- Parkinson's Disease Mechanisms and Treatments
- Ecology and Conservation Studies
- Water Quality Monitoring and Analysis
- Metal and Thin Film Mechanics
- Metallic Glasses and Amorphous Alloys
- Advanced Battery Technologies Research
- Powder Metallurgy Techniques and Materials
- Magnetic Properties of Alloys
- Advanced ceramic materials synthesis
- Silicon Carbide Semiconductor Technologies
- Water Quality Monitoring Technologies
- Plasma Diagnostics and Applications
Hanyang University
2010-2025
Anyang University
2025
Catholic University of Korea
2012-2024
Incheon St. Mary's Hospital
2014-2024
Myongji University
2020-2024
Northwestern University
2024
Duksung Women's University
2024
Samsung (South Korea)
2013-2023
Yonsei University
2008-2023
Uijeongbu St. Mary's Hospital
2023
A conventional phase-shift full-bridge (PSFB) converter with two clamp diodes and an additional resonant inductor is widely used for front-end dc/dc stage in the distributed power system. However, hold-up-time requirement limits its operating duty ratio at normal operation. It results conduction loss caused by circulating current. Therefore, a wide-range zero-voltage switching (ZVS) PSFB reduced current proposed this paper. The adopts large inductance replaces MOSFET switches. With these...
Parkinson’s disease (PD) and Alzheimer’s (AD) can coexist in severely affected; elderly patients. Since they have different pathological causes lesions consequently require treatments; it is critical to distinguish PD-related dementia (PD-D) from AD. Conventional electroencephalograph (EEG) analysis has produced poor results. This study investigated the possibility of using relative wavelet energy (RWE) coherence (WC) between PD-D patients; AD patients healthy subjects. In EEG signals; we...
The twin-roll casting (TRC) process has gained significant attention for aluminum sheet production due to its cost-effectiveness and high processing efficiency. However, controlling the initial grain structure of TRC strips remains challenging absence a hot rolling stage, necessitating an advanced predictive modeling approach. In this study, cellular automaton-finite element (CA-FE) model was developed predict texture fabricated via TRC. Both pure Al AA7075 alloys were cast under identical...
Microglia are involved in immune surveillance intact brains and become activated response to inflammation neurodegeneration. have different functions, neuroprotective or neurotoxic, according aging patients with PD. The clinical effect of microglia Alzheimer's disease (AD) is poorly defined. This prospective study was conducted investigate the effects process newly diagnosed AD.We examined 532 AD 119 healthy controls, differences hs-CRP between these groups were investigated. classified into...
A new transformer integrated with additional resonant inductor is proposed in this paper. By winding on outer side of transformer, the can implement without extra magnetic component. As a result, it reduce cost and core loss due to inductor. In addition, adopt primary clamping diodes voltage ringing secondary rectifiers, although are physically. Experimental result 1200 W (12 V, 100 A) prototype shows that phase-shift full-bridge converter incorporated achieve high efficiency low cost.
To investigate the two-dimensional dispersion characteristics of dissolved contaminant in natural rivers, tracer experiments were performed based on instantaneous injection Rhodamine WT solution into small- to medium-sized rivers Korea. The relations between coefficients and hydraulic geometric variables river analyzed depth. experimental results show that transverse coefficient tends increase as friction term, U/U*, channel aspect ratio, W/H, increase. effect curvature rate mixing was found...
Multicentred hospital-based cases and control subjects in Korea.To evaluate the association between idiopathic pulmonary fibrosis (IPF) hazardous materials to which people are occupationally exposed.A multicentre, hospital-based, matched case-control study was performed. The ratio of IPF controls 1:1 (n = 78 each group). were terms age group, sex place residence. Conditional logistic regression analysis performed.In simple analysis, exposure metal dust any for >1 year an occupational setting...
The occurrence of natural disasters as a consequence accidental hazardous chemical spills remains concern. inadequate, or delayed, initial response may fail to mitigate their impact; hence, imminent monitoring responses in the stage is critical. Classical contact-type measurement methods, however, sometimes miss solvent chemicals and invoke risks for operators during field operation. Remote sensing methods are an alternative method non-contact, spatially distributable, efficient continuously...
In the proposed equalizer, series-connected battery string is modularized into M modules. Each module has voltage monitoring IC and cell selection switch for K cells. The not only monitors voltage, but also controls balancing. With this configuration, balancing can be effectively merged by same controller. Moreover, using a central equalization converter, great size reduction outstanding performance obtained large number of paper, to demonstrate usefulness work, prototype 88 lithium-ion...
High-sensitivity C-reactive protein (hs-CRP) is an extremely sensitive systemic marker of inflammation and tissue damage, increased levels hs-CRP are strongly associated with inflammatory reactions. Microglia-mediated neuroinflammation has been hypothesized to play important role in the pathogenesis idiopathic Parkinson's disease (PD). However, clinical value level patients PD poorly defined. Therefore, we conducted this study analyze differences without dementia.We examined 72 dementia...
Haptoglobin (Hpg) is known to have several functional properties, including antioxidant and anti-inflammatory activities. In addition, it has been shown that the pathogenesis of neurodegenerative disorders, such as Alzheimer's disease (AD), involves inflammation well oxidative stress. However, evidence suggesting an association between serum Hpg level AD lacking. Therefore, we conducted this study in order investigate whether associated with AD.We compared levels 121 patients newly diagnosed...
TiN film was deposited on Si substrate by using an atomic layer chemical vapor deposition (CVD) system. In this system, the TiCl4 and NH3 gases were supplied, separately Ar purge gas added between source reactant to suppress direct reaction. The microstructure of observed be columnar grain structure. species analized Auger electron spectroscopy (AES) Cl content in detected below detection limit AES which 0.5%. density grown at 450 °C measured Rutherford backscattering 4.85 g/cm3 decreased as...
The prognosis of functional disability in patients with cerebrovascular disease has not been well established. Therefore, we conducted this study to determine the prognostic significance high-sensitivity C-reactive protein (hs-CRP) and homocysteine (Hcy) levels after acute first-ever ischemic stroke.A total 309 stroke were examined within 24 h symptom onset. Hcy was measured at admission, hs-CRP measurements made admission on seventh hospital day. correlations between concentration or 1, 3,...
<b>Background and study aims</b>: Polyethylene glycol (PEG) bowel preparations are regarded as effective safe for colonoscopy; however, recent reports have indicated a risk of acute renal failure (ARF). This population-based case-crossover evaluated the association between PEG ARF in screening colonoscopy patients aged ≥ 50 years. <b>Patients methods:</b> Korean Health Insurance Review Assessment Service (HIRA) claims data from 1 January 2005 to 31 December 2009 were used study. The...
The feasibility of using the velocity-based method for calculating transverse mixing coefficient two-dimensional contaminant transport model was studied to substitute concentration-based in which is calculated from concentration curves obtained via costly tracer experiment. To calculate coefficients, hydraulic data and electric conductivity (EC) were collected at confluence tributary rivers Nakdong River, South Korea. experimental results showed that controlled by secondary currents caused...
Previous studies have demonstrated a decreased density of dopamine transporters (DAT) in basal ganglia patients with idiopathic Parkinson disease (IPD) using I-n-fluoropropyl-2b-carbomethoxy-3b-(4-iodophenyl) nortropane (FP-CIT), and the reductions striatal DAT levels were inversely correlated severity motor dysfunction IPD. However, there has been no study on correlation between IPD without cognitive dysfunction. Thus, we evaluated differences regional brain dementia those FP-CIT positron...
Abstract Because urban flooding occurs frequently, it is important to calculate the areal extent of based on flood volumes and water levels, thus, expected damage can be effectively estimated. In this study, inundation from heavy rainfall contribution topographic scales river drainage basins in Seoul, Korea are simulated. A light detection ranging (LiDAR)‐based 1× 1 m digital elevation model (DEM) a 1:5,000 map‐based 10 × DEM used study for storm management (SWMM). Using multi‐dimensional...