A5080016648- Web Data Mining and Analysis
- Spam and Phishing Detection
- Text and Document Classification Technologies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Optimization and Variational Analysis
- Advanced Control Systems Optimization
- Geomagnetism and Paleomagnetism Studies
- Advanced Optimization Algorithms Research
- 3D Surveying and Cultural Heritage
- Scientific Research and Discoveries
- Advanced Multi-Objective Optimization Algorithms
- Galaxies: Formation, Evolution, Phenomena
- Space Exploration and Technology
- Image Processing and 3D Reconstruction
- Virtual Reality Applications and Impacts
- Risk and Portfolio Optimization
- Integrated Energy Systems Optimization
- Urban Planning and Valuation
- Image and Object Detection Techniques
- Evacuation and Crowd Dynamics
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Process Optimization and Integration
Korea Astronomy and Space Science Institute
2022-2024
Korea University of Science and Technology
2022-2024
University of Dayton
2022
Ho Chi Minh City International University
2022
Vietnam National University Ho Chi Minh City
2022
Indiana University
2021
Northern Michigan University
2008-2020
The University of Texas at Dallas
2019
Abstract Magnetic fields are ubiquitous in the Universe and thought to play an important role various astrophysical processes. Polarization of thermal emission from dust grains aligned with magnetic field is widely used measure 2D projected onto plane sky, but its component along line sight not yet constrained. Here, we introduce a new method infer 3D using polarization grain alignment physics. We first develop physical model modern theory based on magnetically enhanced radiative torque...
We report the highest spatial resolution measurement of magnetic fields in M17 using thermal dust polarization taken by SOFIA/HAWC+ centered at 154 $\mu$m wavelength. Using Davis-Chandrasekhar-Fermi method, we found presence strong $980 \pm 230\;\mu$G and $1665 885\;\mu$G lower-density (M17-N) higher-density (M17-S) regions, respectively. The field morphology M17-N possibly mimics gravitational collapse molecular cores while M17-S run perpendicular to matter structure display a pillar an...
The polarisation of light induced by aligned interstellar dust serves as a significant tool in investigating cosmic magnetic fields, properties, and poses challenge characterising the microwave background other sources. To establish reliable tool, physics grain alignment process needs to be studied thoroughly. Magnetically enhanced Radiative Torque (MRAT) is only mechanism that can induce highly efficient grains with fields required observations diffuse medium. Here, we aim test MRAT...
Abstract Polarization of starlight induced by dust grains aligned with the magnetic field (hereafter B -field) is widely used to measure 2D -fields projected onto plane-of-sky. Here, we introduce a new method infer 3D using polarization. We show that inclination angle or line-of-sight component can be constrained polarization efficiency from observations, alignment degree provided magnetically enhanced radiative torque (MRAT) theory, and effect -field tangling. first perform synthetic...
We report the first measurement of polarized thermal dust emission toward entire early and massive Infrared Dark Cloud G11.11$-$0.12 taken by polarimeter SOFIA/HAWC+ at 214 $\mu m$ wavelength. Magnetic fields (B-fields) obtained from tend to be perpendicular filament's spine. produce a map B-field strengths for center region filament. The vary in range 100-600 $\mu\rm{G}$ are strongest along central is sub-Alfv\'enic mostly sub-critical meaning that B-fields dominate over turbulence strong...
Abstract The Atacama Large Millimeter/Submillimeter Array has revolutionized the field of dust polarization in protoplanetary disks across multiple wavelengths. Previous observations and empirical modeling have suggested mechanisms toward HL Tau, including grain alignment scattering. However, a detailed based on physics is not yet available. Here, using an updated POLARIS code, we perform numerical arising from both by magnetically enhanced radiative torque mechanism self-scattering to...
Atacama Large Millimeter/Submillimeter Array (ALMA) has revolutionized the field of dust polarization in protoplanetary disks across multiple wavelengths. Previous observations and empirical modeling suggested mechanisms toward HL Tau, including grain alignment scattering. However, a detailed based on physics is not yet available. Here, using our updated POLARIS code, we perform numerical arising from both by Magnetically Enhanced Radiative Torque (MRAT) mechanism self-scattering to...
Abstract Rapidly spinning magnetic grains can acquire large dipole moments due to the Barnett effect. Here we study new effect of dipole–dipole interaction on grain–grain collisions and grain growth, assuming that are spun up by radiative torques. For ideal situation in which have parallel aligned with ambient field, find collision rate between having embedded iron inclusions be significantly enhanced when rotate suprathermally We discuss implications for growth destruction circumstellar...
A hierarchical optimization (or bilevel programming) problem consists of a decision maker called the leader who is interested in optimizing an objective function that involves with decisions from another follower whose are based part on policies made by leader. However, if planning horizon expands into extended period time, it may be unrealistic for either players to commit original so there desire break stages and wish reevaluate follower's response at each stage. In this article, we...
ABSTRACT Magnetic fields are thought to influence the formation and evolution of circumstellar envelopes around evolved stars. Thermal dust polarization from aligned grains is a promising tool for probing magnetic properties in these environments; however, quantitative study on dependence thermal physical environments still lacking. In this paper, we first perform numerical modelling IK Tau envelope using magnetically enhanced radiative torque (MRAT) alignment mechanism implemented our...
Polarization of starlight induced by dust grains aligned with the magnetic field (hereafter B-field) is widely used to measure two-dimensional B-fields projected onto plane-of-sky. Here, we introduce a new method infer three-dimensional using polarization. The B-field's inclination angle or line-of-sight (LOS) component constrained polarization efficiency from observations and alignment degree provided magnetically enhanced radiative torque (MRAT) theory. We first perform synthetic...
We report the first measurement of polarized thermal dust emission toward entire early and massive Infrared Dark Cloud G11.11$-$0.12 taken by polarimeter SOFIA/HAWC+ at 214 $μm$ wavelength. Magnetic fields (B-fields) obtained from tend to be perpendicular filament's spine. produce a map B-field strengths for center region filament. The vary in range 100-600 $μ\rm{G}$ are strongest along central is sub-Alfvénic mostly sub-critical meaning that B-fields dominate over turbulence strong enough...
Magnetic fields are thought to influence the formation and evolution of evolved star envelopes. Thermal dust polarization from magnetically aligned grains is potentially a powerful tool for probing magnetic properties in these circumstellar environments. In this paper, we present numerical modeling thermal envelope IK Tau using enhanced radiative torque (MRAT) alignment theory implemented our updated POLARIS code. Due strong stellar radiation field, minimum size required RAT silicate $\sim...
Magnetic fields are ubiquitous in the universe and thought to play an important role various astrophysical processes. Polarization of thermal dust emission from grains aligned with magnetic field is widely used measure two-dimensional projected onto plane sky (POS), but component along line sight (LOS) not yet reliably constrained polarization. Here, we introduce a new method infer three-dimensional (3D) using polarization grain alignment physics. We first develop physical model modern...
Abstract It has recently been suggested that planets can form by dust coagulation in the tori of active galactic nuclei (AGN) with low luminosities L bol ≲ 10 42 erg s −1 , constituting a new class exoplanets orbiting supermassive black holes called blanets . However, large grains AGN torus may be rotationally disrupted radiative torque disruption (RATD) mechanism due to radiation feedback, which would prevent blanet formation. To test this scenario, we adopt simple smooth and clumpy...
Abstract Circumstellar dust forms and evolves within the envelope of evolved stars, including asymptotic giant branch (AGB) red supergiant (RSG) stars. The extinction stellar light by circumstellar is vital for interpreting RSG/AGB observations determining high-mass RSG progenitors core-collapse supernovae. However, properties are not well understood. Modern understanding evolution suggests that intense radiation can radically change across through RAdiative Torque Disruption (RAT-D)...
Public speaking is one of the most important ways to share ideas with many people in different domains such as education, training, marketing, or healthcare. Being able master this skill allows speaker clearly advocate for their subject and greatly influence others. However, population reported having public anxiety glossophobia, which prevents them from effectively conveying messages One best solutions have a safe private space practice front As result, research work proposed overarching...
Big cities are well-known for their traffic congestion and high density of vehicles such as cars, buses, trucks, even a swarm motorbikes that overwhelm city streets. Large-scale development projects have exacerbated urban conditions, making more severe. In this paper, we proposed data-driven planning simulator. particular, make use the camera system analysis. It seeks to recognize flows, with reduced intervention from monitoring staff. Then, develop simulator upon analyzed data. The is used...
Circumstellar dust is formed and evolved within the envelope of stars, including Asymptotic Giant Branch (AGB) Red Supergiant (RSG). The extinction stellar light by circumstellar vital for interpreting RSG/AGB observations determining high-mass RSG progenitors core-collapse supernovae. Nevertheless, properties are not well understood. Modern understanding evolution suggests that intense radiation can radically change across through RAdiative Torque Disruption (RAT-D) mechanism. In this...