A5028207573- Combustion and flame dynamics
- Laser-induced spectroscopy and plasma
- Computational Fluid Dynamics and Aerodynamics
- Plasma and Flow Control in Aerodynamics
- Fluid Dynamics and Turbulent Flows
- Advanced Combustion Engine Technologies
- Analytical chemistry methods development
- Photonic and Optical Devices
- Plasma Applications and Diagnostics
- Rocket and propulsion systems research
- Laser-Plasma Interactions and Diagnostics
- Gas Dynamics and Kinetic Theory
- Advancements in PLL and VCO Technologies
- Mass Spectrometry Techniques and Applications
- Mercury impact and mitigation studies
- Health Systems, Economic Evaluations, Quality of Life
- Semiconductor Lasers and Optical Devices
- Particle Dynamics in Fluid Flows
- Spectroscopy and Laser Applications
- Wind and Air Flow Studies
- Aerodynamics and Acoustics in Jet Flows
- Optical Network Technologies
- Artificial Intelligence in Healthcare and Education
- Radiative Heat Transfer Studies
- Combustion and Detonation Processes
Seoul National University
2016-2025
New York University
2021-2025
NYU Langone Health
2025
SK Group (South Korea)
2024
Korea University
2020-2021
University of Notre Dame
2012-2016
Korea Advanced Institute of Science and Technology
2009
KTH Royal Institute of Technology
2009
Stanford University
2008
Abstract Background Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) may occur after infection. How often people develop ME/CFS SARS-CoV-2 infection is unknown. Objective To determine the incidence and prevalence of post-COVID-19 among adults enrolled in Researching COVID to Enhance Recovery (RECOVER-Adult) study. Design, Setting, Participants RECOVER-Adult a longitudinal observational cohort study conducted across U.S. We included participants who had visit at least 6 months no...
The unstart phenomena in a model scramjet with free stream Mach number of 4.5 were investigated at an arc-heated hypersonic wind tunnel. High-speed schlieren imaging and high resonance frequency pressure measurements used to capture the flow features during process. Three conditions tested: (i) low-enthalpy mass loading, (ii) high-enthalpy loading (iii) heat release. It was revealed that threshold time from onset completion depended strongly on rate exchange. negative addition (cooling)...
Ethylene flame dynamics in a model scramjet installed an open test section of arc-heated hypersonic wind tunnel are experimentally investigated with freestreams Mach 4.5–9. An ethylene fuel jet is injected into the that autoignited by high-enthalpy flows compressed and decelerated train shock waves boundary layers developing isolator/combustor. The behavior captured high-speed movie camera through optical access windows on characterized surface pressure/temperature traces recorded at five...
A new pulsed-arc-heated hypersonic wind tunnel facility, designated as ACT-1 (Arc-heated Combustion Test-rig 1), has been developed and built at the University of Notre Dame in collaboration with Illinois Urbana-Champaign Alta S.p.A. The aim design is to provide a suitable test platform for experimental studies on supersonic turbulent combustion phenomena. composed high temperature gas-generator system model scramjet combustor that installed an open-type vacuum section facility. designed...
Abstract The manipulation of an unstarting supersonic flow is demonstrated using a dielectric barrier discharge (DBD). Experiments are carried out in Mach 4.7 model inlet flow. Flow features, such as boundary layers and shockwaves at low freestream static pressure (1 kPa) temperature (60 K) visualized with Rayleigh scattering from condensed CO 2 particles. unstart, initiated by mass injection, studied for three configurations, distinguished the initial conditions (untripped or tripped,...
Morbidity and death due to coronavirus disease 2019 (COVID-19) experienced by older adults in nursing homes have been well described, but COVID-19's impact on community-living is less studied. Similarly, the previous ambulatory care experience of such patients has rarely considered studies COVID-19 risks outcomes.To investigate relationship advanced age (65+), risk factors associated with outcomes elders, we identified an electronic health records cohort aged 65+ laboratory-confirmed without...
Background Despite the proven efficacy of evidence-based healthcare interventions in reducing adverse outcomes and mortality associated with Sickle Cell Disease (SCD), a vast majority affected individuals Africa remain deprived such care. Hydroxyurea (HU) utilization among SCD patients Sub-Saharan (SSA) stands at less than 1%, while Nigeria, approximately 13% benefit from HU therapy. To enhance utilization, targeted implementation strategies addressing provider-level barriers are imperative....
The influences of inlet geometry modification on flow and combustion dynamics are experimentally investigated in a model supersonic ramjet (scramjet) installed Mach 4.5 high-enthalpy air freestreams. upper-lip angle (6, 12, 20 deg) the intake contraction ratio (1.3 1.9) chosen as generic design parameters varied. With geometries systematically modified, flowfields inside scramjet visualized at cold conditions (room temperature) using planar laser Rayleigh scattering method (wherein radiation...
Electrodeless microwave plasmas in carbon dioxide at atmospheric pressure have been studied for decomposition. Plasma optical emission spectroscopy has conducted to measure ro-vibrational temperatures of the plasma. It is found that temperature reaches 6200 K plasma center and there little difference between trans-rotational vibrational temperatures. Kinetic simulations considering trans-rotational, vibrational, electron separately are also investigate details decomposition dioxide. As...
The effect of continuous volumetric direct-coupled nonequilibrium atmospheric microwave plasma discharge on swirl-stabilized premixed methane–air flames was investigated using quantitative OH planar laser-induced fluorescence and spectrally resolved emission. found to influence the dynamics flame stabilization, i.e., plasma-assisted stabilized in quiescent center body wake were relatively stable while swirl active inner shear layer prone local extinction due aerodynamic shear. At coupled...
Simultaneous laser ignition and spectroscopy is a scheme that enables rapid determination of the local equivalence ratio condensed fuel concentration during reaction in two phase spray flame. In parallel with ignition, droplet characteristics such as concentration, size, distribution combustion are simultaneously obtained for feedback control system. The plasma droplets evaluated initially by shadowgraph, high-speed imaging air breakdown provides visualization transition from to flame...
The effects of inlet distortion and shockwave interaction on fuel-air distribution ignition in a cavity-based flameholder with supersonic flow were investigated using nanosecond-gated laser-induced breakdown spectroscopy (n-LIBS). Experiments conducted Mach-3 freestream direct-connect-type wind tunnel direct cavity fueling. Ethylene, , was used as the fuel for all testing. Inlet created wedge top wall tunnel, which formed an oblique shock. positioned at two distinct locations such that shock...