A5006687420- Enzyme Catalysis and Immobilization
- Gamma-ray bursts and supernovae
- biodegradable polymer synthesis and properties
- Semiconductor materials and devices
- Biofuel production and bioconversion
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- GaN-based semiconductor devices and materials
- Enzyme Production and Characterization
- Microbial Metabolic Engineering and Bioproduction
- Advancements in Semiconductor Devices and Circuit Design
- Stellar, planetary, and galactic studies
- Microbial Metabolites in Food Biotechnology
- Analytical Chemistry and Chromatography
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Cellulose Research Studies
- Biopolymer Synthesis and Applications
- Acoustic Wave Resonator Technologies
- Astrophysical Phenomena and Observations
- Cellular and Composite Structures
- Metal and Thin Film Mechanics
- Astro and Planetary Science
- Adhesion, Friction, and Surface Interactions
- Silicon and Solar Cell Technologies
- Semiconductor materials and interfaces
Seoul National University
2013-2024
Samsung (South Korea)
2022-2024
Samsung SDS (South Korea)
2022-2024
Korea Astronomy and Space Science Institute
2020-2023
Chungnam National University
2012
Korea Automotive Technology Institute
2012
Kyungpook National University
2002-2011
Chonnam National University
2006-2009
Yonsei University
2005-2007
Chonnam National University Hospital
2006
Abstract The kinetics of enzymatic hydrolysis pure insoluble cellulose by means unpurified culture filtrate Trichoderma reesei was studied, emphasizing the kinetic characteristics associated with extended times. changes in rate and extent soluble protein adsorption during progress reaction, either apparent or intrinsic, were investigated. declined drastically initial hours hydrolysis. factors causing reduction examined; these include transformation into a less digestible form product...
Phosphorus ($^{31}$P), which is essential for life, thought to be synthesized in massive stars and dispersed into interstellar space when these explode as supernovae (SNe). Here we report on near-infrared spectroscopic observations of the young SN remnant Cassiopeia A, show that abundance ratio phosphorus major nucleosynthetic product iron ($^{56}$Fe) material up 100 times average Milky Way, confirming produced SNe. The observed range compatible with predictions from models but not scenario...
Abstract We report findings from near-infrared imaging observations of 17 young and middle-aged supernova remnants (SNRs) in the Magellanic Clouds to examine impact SNR shocks on dust destruction possible detection ejecta. have analyzed [P II ] (1.189 μ m) [Fe (1.257 1.644 narrowband images obtained with InfraRed Survey Facility 1.4 m telescope at South African Astronomical Observatory. calculate P/Fe abundance ratio, X (P/Fe), using ]/[Fe line which provides valuable information content...
We report the results of broadband (0.95--2.46 $\mu$m) near-infrared spectroscopic observations Cassiopeia A supernova remnant. Using a clump-finding algorithm in two-dimensional dispersed images, we identify 63 "knots" from eight slit positions and derive their properties. All knots emit [Fe II] lines together with other ionic forbidden heavy elements, some them also H He lines. 46 emission line features total measure fluxes radial velocities. The our analyses based on principal component...
We discuss 94 Extended Green Objects (EGOs) in the northern Galactic plane cataloged by Cyganowski et al, based on near-infrared narrowband H2 (2.122 {\mu}m and continuum observations from United Kingdom Infrared Telescope. This data set is three times larger than our previous study, unbiased preselection. As discussed paper, morphologies of 4.5 emission generally resemble those continuum, but are different emission. Of sample, only 28% EGOs with show similar between These results suggest...
Abstract We present a long-exposure (∼10 hr), narrowband image of the supernova (SN) remnant Cassiopeia A (Cas A) centered at 1.644 μ m emission. The passband contains [Fe ii ] and [Si i 1.645 lines, our “deep ]+[Si image” provides an unprecedented panoramic view Cas A, showing both shocked unshocked SN ejecta, together with circumstellar medium subarcsecond (∼0.″7 or 0.012 pc) resolution. diffuse emission from ejecta has form clumps, filaments, arcs, their spatial distribution correlates...
The United Kingdom Infrared Telescope (UKIRT) Widefield Survey for Fe$^+$ (UWIFE) is a 180 deg$^2$ imaging survey of the first Galactic quadrant (7$^{\circ}$ < l 62$^{\circ}$; |b| 1.5$^{\circ}$) using narrow-band filter centered on [Fe II] 1.644 {\mu}m emission line. good tracer dense, shock-excited gas, and will probe violent environments around stars: star-forming regions, evolved stars, supernova remnants, among others. UWIFE designed to complement existing UKIRT H2 (UWISH2; Froebrich et...
Abstract We report the detection of near-infrared (NIR) [Fe ii ] (1.644 μ m) and H 2 1–0 S(1) (2.122 line features associated with Galactic supernova remnants (SNRs) in first quadrant using two narrowband imaging surveys, UWIFE UWISH2. Among total 79 SNRs fully covered by both we found 19 ]-emitting -emitting SNRs, giving a rate 24% for each. Eleven show emission features. The peaks at longitude ( l ) 40°–50° 30°–40°, respectively, gradually decreases toward smaller/larger . Five out eleven...
Abstract Galactic supernova remnants (SNRs) and their environments provide the nearest laboratories to study SN feedback. We performed molecular observations toward SNR W49B, most luminous in X-ray band, aiming explore signs of multiple feedback channels SNRs on nearby clouds (MCs). found very broad HCO + lines with widths dv ∼ 48–75 km s −1 southwest, providing strong evidence that W49B is perturbing MCs at a systemic velocity V LSR = 61–65 , placing distance 7.9 ± 0.6 kpc. observed...