A5101598453- Vibration Control and Rheological Fluids
- Seismic Performance and Analysis
- Structural Engineering and Vibration Analysis
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Vibration and Dynamic Analysis
- Structural Health Monitoring Techniques
- Astrophysics and Star Formation Studies
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Hydraulic and Pneumatic Systems
- Dust and Plasma Wave Phenomena
- Photocathodes and Microchannel Plates
- Fluid Dynamics and Vibration Analysis
- Stellar, planetary, and galactic studies
- Magnetic confinement fusion research
- Dark Matter and Cosmic Phenomena
- Mechanical stress and fatigue analysis
- Astro and Planetary Science
- Plasma Diagnostics and Applications
- Galaxies: Formation, Evolution, Phenomena
- Geomagnetism and Paleomagnetism Studies
- Astrophysical Phenomena and Observations
- Earthquake Detection and Analysis
- Wind and Air Flow Studies
Dankook University
2006-2016
Korea Advanced Institute of Science and Technology
2005-2014
Chonnam National University
2014
Abstract Passive energy dissipation devices are generally used to reduce structural responses caused by earthquake or wind loads. This study presents combined system of rotational friction dampers connected high strength tendons enhance both seismic and progressive collapse‐resisting capacity existing structures. Friction were designed using the spectrum method satisfy given performance objectives against load, their seismic‐ capacities investigated. According nonlinear dynamic analysis...
The conventional practice of carrying out a series trial and error process for design supplemental dampers requires lot computation time labour. In this study straightforward procedure viscous was developed based on capacity spectrum method in the context performance seismic design. required amount damping to satisfy given acceptance criteria evaluated from difference between overall demand effective inherent plus equivalent structure originated plastic deformation each structural member....
The Korteweg-deVries (KdV) equation that describes the evolution of nonlinear ion-acoustic solitary waves in plasmas with Kappa-distributed electrons is derived by using a reductive perturbation method small amplitude limit. We identified dip-type (negative) electrostatic KdV wave, addition to hump-type solution reported previously. two types occupy different domains on κ (Kappa index)-V (propagation velocity) plane, separated curve corresponding singular solutions infinite amplitudes. For...
The SPEAR (or "FIMS") instrumentation has been used to conduct the first large-scale spectral mapping of diffuse cosmic far-ultraviolet (FUV; 900-1750 Å) emission, including important diagnostics interstellar hot (104-106 K) and photoionized plasmas, H2, dust-scattered starlight. instrumentation's performance allowed for unprecedented detection astrophysical FUV emission lines. A resolution λ/Δλ ~ 550 an imaging 5' is achieved on-orbit in Short (900-1150 Long (1350-1750 bandpass channels...
A tuned liquid mass damper (TLMD) is proposed for bi-directional control of the wind responses a building in orthogonal directions. It that behaves as column (TLCD) and also (TMD) direction to TLCD. Therefore, TLMD provides performance both TLCD TMD. First, experiments are performed installed at angles on uniaxial shaking table order describe responses. The results reveal independent TMD behaviors found, leading conclusion controlled by one TLMD. Finally, real size manufactured fifth floor...
Abstract. We have investigated the generation of magnetic fields associated with velocity shear between an unmagnetized relativistic jet and sheath plasma. examined strong generated by kinetic (Kelvin–Helmholtz) instabilities. Compared to previous studies using counter-streaming performed Alves et al. (2012), structure Kelvin–Helmholtz instability (KKHI) our jet-sheath configuration is slightly different, even for global evolution transverse field. In simulations major components growing...
Diffuse far-ultraviolet (FUV; 1370-1670 Å) flux from the Taurus molecular cloud region has been observed with SPEAR/FIMS imaging spectrograph. An FUV continuum map of region, similar to visual extinction maps, shows a distinct core and halo region. The dense core, where Av > 1.5, obscures background diffuse radiation, while scattered radiation is seen in beyond < 1.5. total intensity H2 fluorescence I = 6.5 × 104 photons cm-2 s-1 sr-1 Å wavelength band. A synthetic model fluorescent emission...
We present the first far-ultraviolet (FUV; 1370-1670 Å) image of Ophiuchus molecular cloud region, observed with SPEAR imaging spectrograph. The flux levels diffuse FUV continuum are in reasonable agreement those Voyager observations shorter wavelengths (912-1216 Å), provided that emission is dominated by spectra from late O- and early B-type stars. region study was divided into five subregions according to their intensities, spectrum obtained for each subregion prominent H2 fluorescent...
This study proposed simply design procedure of a single degree freedom (SDOF) structure equipped with friction dampers. General method is suggested in order to reduce the structural seismic response by using The analysis model was transformed into an equivalent mass-spring-dashpot system approximating nonlinear damping force viscous force. A closed form solution for dynamic amplification factor (DAF) steady-state derived energy balance equation. ratio defined DAF at natural frequency....
Plants belonging to the genus Juncus are widely distributed across North America, which known make a diverse array of bioactive natural products. In 2022, torreyi, species Juncus, was firstly found in Korea. Morphological and ecological characteristics have been previously investigated; however, chemical potentials still remain be explored. present work, we focused on isolation characterization metabolites that harbor growth inhibitory activity against fungal indicator, Candida albicans....
This study deals with the design of a bi-directional liquid damper for SDOF structure. Two dampers are usually needed to reduce wind-induced responses tall structures since they along and across wind ones. The proposed has advantage controlling both single damper. shows dynamic behavior tuned column (TLCD) sloshing (TSD) in direction two axes perpendicular each other. paper presents experimental verification confirm its control performance. First, shaking table test is carried out...
This study proposes a retunable liquid column vibration absorber (LCVA) that can handle wide range of natural frequencies while maintaining its original shape. The LCVA’s vertical tubes are divided into several smaller (i.e., cells). Sealing cell makes the in it stand still so only part contained within LCVA participates motion. By selecting appropriate configurations sealed cells, sectional area ratios and horizontal effective tube length changed, which yields new to accommodate shifts...
We report the results of a 3D particle-in-cell simulation carried out to study early-stage evolution shock formed when an unmagnetized relativistic jet interacts with ambient electron-ion plasma. Full-shock structures associated interaction are observed in frame. When open boundaries employed direction jet, forward is seen as hybrid structure consisting electrostatic combined double layer, while reverse layer. The ions show two distinct features across shock: population penetrating into...
In this work, three different magneto-rheological(MR) dampers, which are applicable for vibration control of a multi-story structure, devised and their performance characteristics compared. As first step, the schematic configurations shear, flow, mixed mode MR dampers described with design constraints. The analytical models to predict field-dependent damping forces derived each type evaluated. compared in terms force magnitude mixed-mode damper is chosen as an optimal candidate structure. An...