A5101552889- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Graphene research and applications
- Spacecraft and Cryogenic Technologies
- Gyrotron and Vacuum Electronics Research
- Nuclear reactor physics and engineering
- Radiative Heat Transfer Studies
- Nuclear Physics and Applications
- 2D Materials and Applications
- Thermal Radiation and Cooling Technologies
- Advanced Thermodynamics and Statistical Mechanics
- Graphene and Nanomaterials Applications
- Gas Dynamics and Kinetic Theory
- ZnO doping and properties
- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Thermal properties of materials
- Electron and X-Ray Spectroscopy Techniques
- Photonic Crystals and Applications
- Ga2O3 and related materials
- Gas Sensing Nanomaterials and Sensors
- Quantum Electrodynamics and Casimir Effect
- Plasmonic and Surface Plasmon Research
- Thermography and Photoacoustic Techniques
Institute for Basic Science
2014-2024
Korea University
2010-2014
Daejeon University
2014
Samsung (South Korea)
2009-2010
This research focuses on exploring generalized electron emissions in one-dimensional conducting materials, specifically examining field emission and thermionic emission. Additionally, this study investigates thermal radiation. The current density is derived for both A one dimension devised, taking into account arbitrary accelerating fields temperature conditions. formula the depicted with across various work function materials. represented as a of electric fields. also temperatures.
Ferromagnetic materials have been attracting great interest in the last two decades due to their application spintronics devices. One of hot research areas magnetism is currently two-dimensional materials, transition metal dichalcogenides (TMDCs), which unique physical properties. The origins and mechanisms especially correlation between defects, studied recently. We investigate changes magnetic properties with a variation annealing temperature for nanoscale compound MoS2. pristine MoS2...
Investigations into the properties of generalized effective temperature are conducted across arbitrary dimensions. Maxwell-Boltzmann distribution is displayed for one, two, and three dimensions, with temperatures expressed each dimension. The energy density blackbody radiation examined as a function dimensionality. Effective non-uniform distributions in three, higher dimensions presented, generalizations extended to Furthermore, application explored not only linearly but also scenarios...
We report on the transport and magnetic properties of graphene annealed at 800 °C under an Ar atmosphere.
Silica nanostructures were fabricated on glass substrate using a microwave assisted direct patterning (MADP) process, which is variety of soft lithography. During the MADP process polydimethylsiloxane (PDMS), mold and heating are performed simultaneously. Blanket thin film micro- to nano-sized structures, including moth-eye patterns SiO2, consisted coalesced silica nanoparticles, formed substrates from SiO2 nano-particle dispersed solutions with varied time. Optical properties surface...
In this paper, the magnetic heating effect of superconducting quarter-wave resonator (QWR) cavities is investigated, and Q slopes are measured with an increasing accelerating field. Bardeen–Cooper–Schrieffer (BCS) resistance calculated for zero-temperature limit. The vertical test shown performance QWR cavities. parameters cavity presented. as a function electric field at 4.2 K. surface increases peak defects degrade quality factor. From degradation, we determine moments All cryomodules...
Many welding processes are performed to construct cryogenic system. Leak-tight for the system is required at low temperature environment. Helium leak detection techniques commonly used find The helium spraying, sniffing and pressurizing introduced. High vacuum also necessary use detector. So, types of fluid flow, effective temperature, conductance pumping speed introduced pumping. Leak test procedure shown pipe welding, cryomodule test. Cryogenic seals which include copper gasket, helicoflex...
Optical, electrical and structural properties of VOx/ZnO/VOx thin film are studied. The multilayer is deposited by using a radio frequency (RF) sputtering system. shows the high temperature coefficient resistance (TCR) <TEX>$-3.12%/^{\circ}C$</TEX> low sheet about 80 <TEX>$k{\Omega}/sq$</TEX> at room temperature. responsivity detectivity bolometer measured as function modulation frequency.
The magnetic heating effect for the superconducting quarter-wave resonator (QWR) cavities is investigated, and Q slopes of are measured with an increasing accelerating field. Physical phenomena zero-temperature limit introduced. Bardeen–Cooper–Schrieffer (BCS) resistance Casimir force calculated limit. vertical test shown performance cavities. parameters cavity presented. as a function electric field at 4.2 K. surface increases peak defects cause degradation quality factor. From degradation,...
Abstract There are two kinds of well‐known electron emissions from metal: field and thermionic emission. For emission, electrons come out a metal due to the thermal energy, whereas for tunnel through strong electric field. In this study, most general emission caused by temperature with free gas model was considered. The total current density comes effect, where energy is lower than vacuum, thermionic‐emission higher vacuum. shown as function constant field, temperature. Keywords:...
This research focuses on exploring generalized electron emissions in one-dimensional conducting materials, specifically examining field emission and thermionic emission. Additionally, the study investigates thermal radiation. The current density is derived for both A one dimension devised, taking into account arbitrary accelerating fields temperature conditions. formula depicted with across various work function materials. also represented as a of electric temperatures.
The band gap research in graphene is still a very important topic for materials application. Here, we report opening and p-type semiconducting property of the by using an electrochemical doping on surface. manganese-oxide nanopar-ticles adsorbed were used as dopants electrolyte, which induce change electronic structure. In addition, fabricated FET shows semiconductor behaviors. temperature dependent conductivity doped at applied potential 1.5 V during electro-chemical formation 0.23 eV,...
Investigations into the properties of generalized effective temperature are conducted across arbitrary dimensions. Maxwell–Boltzmann distribution is displayed for one, two, and three dimensions, with temperatures expressed each dimension. The energy density blackbody radiation examined as a function dimensionality. Effective non-uniform distributions in three, higher dimensions presented, generalizations extended to Furthermore, application explored not only linearly but also scenarios...