A5072945707- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Plasma Applications and Diagnostics
- Catalytic Processes in Materials Science
- Plasma Diagnostics and Applications
- Geomagnetism and Paleomagnetism Studies
- Semiconductor materials and devices
- Stellar, planetary, and galactic studies
- Mechanical Engineering and Vibrations Research
- Engineering Applied Research
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- Surface Modification and Superhydrophobicity
- Copper Interconnects and Reliability
- Atmospheric Ozone and Climate
- Industrial Vision Systems and Defect Detection
- Mechanical Failure Analysis and Simulation
- Diamond and Carbon-based Materials Research
- Advanced Sensor and Energy Harvesting Materials
- Advanced Combustion Engine Technologies
- Industrial Gas Emission Control
- Metal and Thin Film Mechanics
- nanoparticles nucleation surface interactions
- Image and Object Detection Techniques
- Burn Injury Management and Outcomes
Korea Astronomy and Space Science Institute
2017-2024
Chungnam National University
2008-2024
SK Group (South Korea)
2024
Kyung Hee University
2014-2017
Korea Institute of Machinery and Materials
2003-2016
To activate a catalyst efficiently at low temperature by plasma for environmental control, we developed hybrid reactor that combines with honeycomb-structured in practical manner. The generated stable cold atmospheric pressure because of the dielectric and conductive nature honeycomb consuming amounts power. In this reactor, applied voltage determined balance between oxidation adsorption catalyst. synergistic reaction was more effective temperatures, resulting reduction lowered light-off temperature.
Abstract Understanding the formation of post-CME blobs, we investigate 2 blobs in outer corona observed by LASCO-C2 and 34 inner K-Cor on 2017 September 10 from 17:11 to 18:58 UT. By visual inspection structure a current sheet (CS) its associated find that CS is well identified radial lengths are nine times longer than lateral widths, indicating unstable linear tearing mode. The can be classified into two groups: 27 generated middle (Group 1) 7 occurred above tips it 2). Their widths <?CDATA...
Abstract To prepare for when only single‐view observations are available, we have made a test whether the 3‐D parameters (radial velocity, angular width, and source location) of halo coronal mass ejections (HCMEs) from consistent with those multiview observations. For this test, select 44 HCMEs December 2010 to June 2011 following conditions: partial full by SOHO limb CMEs twin STEREO spacecraft they were approximately in quadrature. In study, compare three different methods: (1) geometrical...
Suppression of hypertrophic scar generation in an animal model by treatment with plasma is reported. Contact burn following mechanical stretching was used to induce formation mice. Exposure the tended reduce area more rapidly without affecting vitality. The resulted decreased vascularization tissue. Plasma-treated scars showed mild decrease thickness tissues as shown histological assessment. Finally, we that induced cell death and reactive oxygen species fibroblast. All results support can...
Abstract We study properties of intensity disturbances along polar coronal rays that are associated with plumes below. For this, we draw azimuth–time images extreme ultraviolet (EUV) emission 171 Å band observed by the SDO/AIA and white light (WL) SOHO/LASCO C2 in 2020 July. From image, define two tracks which EUV intensities were recurrently enhanced during weeks. The rooted at 78.°8 81.°4 latitudes, but their projected azimuth angles changed time as Sun rotates. Coherent WL different...
Recently, several studies have assumed that the faint structures ahead of coronal mass ejections (CMEs) are caused by CME-driven shocks. In this study, we conducted a statistical investigation to determine whether or not appearance such depends on CME speeds. For purpose, use 127 Solar and Heliospheric Observatory/Large Angle Spectroscopic COronagraph (LASCO) front-side halo (partial full) CMEs near limb from 1997 2011. We classify these into two groups visual inspection in LASCO–C2 field...
Abstract In this study, we suggest a pixel-to-pixel image translation method among similar types of filtergrams such as solar extreme-ultraviolet (EUV) images. For this, consider deep-learning model based on fully connected network in which all pixels EUV images are independent one another. We use six-EUV-channel data from the Atmospheric Imaging Assembly (AIA) board Solar Dynamics Observatory (SDO), three channels (17.1, 19.3, and 21.1 nm) used input remaining (9.4, 13.1, 33.5 target data....
Abstract It is generally believed that fast coronal mass ejections (CMEs) can generate their associated shocks, which are characterized by faint structures ahead of CMEs in white-light coronagraph images. In this study, we examine whether the observational stand-off distance ratio, defined as CME divided its radius, be explained bow shock theories. Of 535 SOHO /LASCO (from 1996 to 2015) with speeds greater than 1000 km s −1 and angular widths wider 60°, select 18 limb following conditions:...
In this paper, we present two distinct types of coronal mass ejection (CME)-flare relationships according to their observing time differences using 107 events from 2010 2013. The difference, ΔT, is defined as flare peak minus CME first appearance at Solar Terrestrial Relations Observatory (STEREO) COR1 field view. There are 41 for group A (ΔT < 0) and 66 B ≥ 0). We compare 3D parameters (speed kinetic energy) based on multi-spacecraft data (SOlar Heliospheric (SOHO) STEREO B) associated...
Abstract We have made a comparison between coronal mass ejection (CME)‐associated shock propagations based on the Wang‐Sheeley‐Arge (WSA)‐ENLIL model using three cone types and in situ observations. For this we use 28 full‐halo CMEs, whose parameters are determined their corresponding interplanetary shocks were observed at Earth, from 2001 to 2002. consider different (an asymmetric model, an ice cream elliptical model) determine 3‐D CME (radial velocity, angular width, source location),...
Catalytic CO oxidation was activated at low temperature by injecting O3 as an additive. It empirically confirmed that removal rate dramatically enhanced supplying a small amount of O3, and the reaction almost half required for when using catalyst only. By optimizing concentration catalytic could be achieved within 1 min operational temperature. The sensitive to deduced mechanism is discussed explain how but subsequently deactivated higher concentration. Moreover, presence C3H8 C3H6 were...
Abstract We determine coronal electron density distributions (CEDDs) by analyzing decahectometric (DH) type II observations under two assumptions. DH bursts are generated either (1) shocks at the leading edges of mass ejections (CMEs) or (2) CME shock‐streamer interactions. Among 399 Wind/WAVES (from 1997 to 2012) associated with SOHO/LASCO (Large Angle Spectroscopic COronagraph) CMEs, we select 11 limb events whose fundamental and second harmonic emission lanes well identified. lowest...
The foot plays an important role in supporting the body and keeping balance. An abnormal walking habit breaks balance of human as well function foot. orthotics which is designed to consider biomechanics effectively distributes load on sole In this paper, gait analysis was performed for three male subjects wearing orthotics. study, were selected. experimental apparatus consists a plantar pressure system digital EMG system. characteristics are simulated by ADAMS/LifeMOD. COP (Center Pressure),...
Abstract The core Flight System (cFS), developed by NASA, is a reusable software framework and set of pluggable applications that take advantage the rich heritage NASA’s successful space missions. We applied cFS to development telescope control for observation 2017 total solar eclipse. Four main modules were developed: imaging control, mechanism data handling, automated observation. Other modules, such as communication scheduler, reused from cFS. Using an integrated system, we successfully...
The heavy duty diesel engine must have a large output for maintaining excellent mobility. In this study, three dimensional finite element model of heavy-duty was developed to conduct the stress analysis. FE main parts consisting with four half cylinder selected. includes block, head, gasket, liner, bearing cap, and bolts. loading conditions were pre-fit load, assembly gas load. As results structural analysis, because values block cap did not exceed basic design can be satisfied. But on part...
The heavy duty diesel engine must have a large output for maintaining excellent mobility. In this study, three-dimensional finite element model of heavy-duty was developed to conduct the stress analysis by using property CGI. compacted graphite iron (CGI) is material currently under study demanded high torque, durability, stiffness, and fatigue. FE section consisting four half cylinders selected. includes cylinder block, head, gasket, liner, bearing cap, bolts. loading conditions are pre-fit...
<TEX>$CF_4$</TEX> removal characteristics were investigated using an elongated arc reactor. The advantage of the reactor includes direct use treated gas as plasma operating and enhancement reaction by a thermo-chemistry induced chemistry at same time. Geometrical configurations, such length shape throat, tested to get optimized efficiency with low power consumption. As results, over 95% was obtained 300 lpm total flowrate for various concentration (0.1~1%). Corresponding specific energy...
선박엔진 배기가스의 국제적인 규제가 강화되고 있으며, 규제를 적극적으로 대응하기 위한 기술이 필요하다. 본 연구에서는 플라즈마 버너를 적용하여 질소산화물 저감 성능을 향상시키고, 촉매 재생에 활용하기 가능성을 확인하기 연구를 수행하였다. 실험을 통해, 버너의 연소 확인할 수 있었으며, 공연비 대비 40% 이하의 공기 조건에서의 안정적인 연소와 산소를 활용한 연료의 완전 연소를 확인하였다. 또한, 요소수를 환원제로 탈질실험을 수행하였으며, 통해 탈질 촉매의 작동 영역으로 온도를 제어하여 향상시킬 있음을 재생을 성능이 회복되는 결과로부터 활용하여 설비의 내구성 향상에 기여할