A5101407366- Power Quality and Harmonics
- Power System Reliability and Maintenance
- Industrial Vision Systems and Defect Detection
- Microwave Engineering and Waveguides
- Antenna Design and Analysis
- Power Transformer Diagnostics and Insulation
- Advancements in Battery Materials
- Surface Roughness and Optical Measurements
- Engineering Applied Research
- Manufacturing Process and Optimization
- Advanced Battery Materials and Technologies
- Optimal Power Flow Distribution
- Injection Molding Process and Properties
- Supercapacitor Materials and Fabrication
- Additive Manufacturing and 3D Printing Technologies
- Advanced Battery Technologies Research
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Optimization
- Image Processing Techniques and Applications
- Structural Health Monitoring Techniques
- Power System Optimization and Stability
- Advanced Fiber Laser Technologies
- Advanced Sensor and Energy Harvesting Materials
- Lightning and Electromagnetic Phenomena
- Optical measurement and interference techniques
Ulsan National Institute of Science and Technology
2020-2024
Pusan National University
2024
Samsung (South Korea)
2004-2023
Pukyong National University
2011-2023
Centre Lasers Intenses et Applications
2022
Centre National de la Recherche Scientifique
2022
Université de Bordeaux
2022
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2022
Yonsei University
2022
Seoul National University
2022
An ultra-small integrated photonic temperature sensor has been proposed and demonstrated which incorporates a silicon ring resonator linked to vertical grating coupler. It was manufactured using 0.18 μm standard CMOS process, rendering homogeneous integration into other electrical/optical devices. The variation measured by monitoring the shift in resonant wavelength of resonator, induced thermo-optic effect thermal expansion effect. dependence its sensing capability upon waveguide width...
Over the past decade, lithium metal has been considered most attractive anode material for high-energy-density batteries. However, its practical application hindered by high reactivity with organic electrolytes and uncontrolled dendritic growth, resulting in poor Coulombic efficiency cycle life. In this paper, we propose a design strategy interface engineering using conversion-type reaction of fluorides to evolve LiF passivation layer Li-M alloy. Particularly, LiF-modified Li-Mg-C electrode,...
The increasing use of low-cost lithium iron phosphate cathodes in low-end electric vehicles has sparked interest Prussian blue analogues (PBAs) for lithium-ion batteries. A major challenge with hexacyanoferrate (FeHCFe), particularly systems, is its slow kinetics organic electrolytes and valence state inactivation aqueous ones. We have addressed these issues by developing a polymeric cathode electrolyte interphase (CEI) layer through ring-opening reaction ethylene carbonate triggered OH–...
This paper presents a method for stochastic prediction of voltage sags caused by faults in power system. The area vulnerability must be determined to estimate the expected sag frequency (ESF) at sensitive load site. However, is not easy identify large meshed network. In paper, residual phase equations balanced and unbalanced are presented, an efficient determine network described. An ESF estimation based on information technology industry council (ITIC) curve also developed was applied IEEE...
Traditional binders generally interact with silicon particles via weak van der Waals forces and consequently lack interactions between active materials after volume expansion. Water-soluble have recently garnered lots of attention as low-cost environmentally benign aqueous media to overcome the main challenges practical processing considerations. Herein, we report development a multifunctional polymeric binder having three-dimensional network structure for silicon-based anodes, providing...
Achieving fast-charging lithium-ion batteries (LIBs) with reliable cyclability remains a significant challenge. In this study, we investigate the use of phosphorus nanolayers as strategy to enhance lithiation kinetics and performance graphite-based composites without inducing lithium (Li) plating on electrode surface, increasing delivery capacity. particular, operando optical microscopy reveals that during fast charging, concentrated Li-ion flux near graphite surface impedes permeation into...
In this letter, a new type of resonant series slot array antenna for Ka-band 45 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> linear polarization (LP) is described. Sixteen radiating slots, tilted at an angle , are separated by one-half guided wavelength due to use the alternating inductive and capacitive load pairs. These reactance pairs allow novel achieve impedance matching, uniform field excitation, suppression grating lobes...
The practical use of silicon anodes is interfered by the following key factors: volume expansion, slow kinetics, and low electrical ionic conductivities. Many studies have focused on surface engineering from particle to electrode level achieve stability energy density. Herein, simple nitrogen gas plasma introduced as a treatment method for silicon-based electrodes avoid problems material synthesis-based functionalizations (e.g., high cost, time consuming, quality). introduction activated...
The electrochemical performance of prussian blue analogues (PBAs) can be determined by the number interstitial water molecules in channels, which inhibits insertion and diffusion sodium-ions an aqueous electrolyte system.
The design method for a standing-wave series slot array antenna with 45°-inclined linear polarization in the Ka-band is presented. proposed 16 × 8 planar consisted of arrays alternating reactance pairs that could achieve impedance matching and uniform field ex- citation, simultaneously. Furthermore, grating lobes were effectively suppressed help these radiating units due to one-half guided wavelength spacing. An equivalent circuit analysis was done evaluate input impedances feeding lines...
This paper describes a systematic method for determining an area of vulnerability (AOV) to fault induced voltage sags. The concept AOV is very useful evaluating and the relationship between sensitive loads system sag performance. In general, performance assessment pertaining sags requires determination AOVs buses. Because can be caused by remote faults in transmission system, completely identify AOV, large part power including adjacent circuits supply systems should considered. Therefore,...
This study proposes an effective method for voltage quality assessment considering low ride‐through (LVRT) requirement wind turbines. With increasing power generation, there is a strong need system connection requirements of turbines, stable operation even under fault conditions. The LVRT specify acceptable magnitude and duration maintaining the to systems sags. In general, different grid points farms have performance. Therefore, can be severe certain connecting proposed efficiently assess...
This paper discusses the influence of generator scheduling and time-varying fault rates on stochastic prediction voltage sags. Typically, in sags, annual expected sag frequencies (ESFs) at sensitive load points are calculated by assuming that operating conditions topology power system remain unchanged components constant throughout a year. In this paper, order to obtain reasonable accuracy predicting ESFs points, variation due adverse weather effect considered. The study was performed IEEE...
Transition metal layered oxides (LiNixCoyMn1-x-yO2, NCM) have been considered as one of the most promising cathodes for lithium-ion batteries used in long-mileage electric vehicles and energy storage systems. Despite its potential interest, dissolved transition (TM) ions toward anode sides can catalyze parasitic reactions such electrolytic decomposition dendritic Li growth, ultimately leading to catastrophic safety hazards. In this study, we demonstrate that Prussian Blue (PB) nanoparticles...
Abstract The liquid‐phase synthesis (LS) of sulfide solid electrolytes (SEs) has promising potential for mass production practical all‐solid‐state Li batteries (ASLBs). However, their accessible SE compositions are mostly metal‐free. Moreover, liquid‐phase‐synthesized‐SEs (LS‐SEs) suffer from high electronic conductivity due to carbon impurities, resulting in below‐par electrochemical performance ASLBs. Here, the LS highly deformable and air‐stable 3+x P 1‐x Sn x S 4 (0.19 mS cm −1 ) using...
Defective rollers in rolling plants often create spatially periodic defects on the product surface. It is essential for operators to receive early warnings of such and take appropriate action avoid a large quantity defective products. We present robust efficient real-time method inspecting continuous steel wire rods. The proposed inspection consists two parts: (1) an algorithm detecting all defect candidates (2) detect periodicities detected determine their periods. first exploits...
This paper presents a method for evaluating the harmonic contributions of multiple sources to voltage distortion at point common coupling (PCC). The proposed quantitatively represents based on equivalent models sources. can be estimated using recursive least square (RLS) algorithm and measured current PCC. assessment contribution heavily depends accuracy model estimation. Many existing studies have assumed that parameters are not changed. However, because source system operating conditions...
In South Korea, we are aiming for net zero energy use apartment home structures. Since the structure in Korea is generally a high-rise of 10 or more floors, types renewable applicable limited to photovoltaic (PV) panels, solar collectors installed on wall, thermal (PVT) hybrid panel combining both. this study, effect PV, ST (Solar Thermal), and PVT systems greenhouse gas reduction was analyzed using TRNSYS18. All three showed maximum CO2 reductions at 35° facing south. ST, 67.4, 114.6, 144.7...
This paper presents a simple and efficient power-quality (PQ) evaluation method based on the half-cycle root-mean-square (H-RMS) calculation, which can be easily applied to waveform distortions processed from instantaneous values. PQ disturbances, especially related voltage magnitude variations, generally divided into two categories by measuring method: One is rms-based events, include sag, swell, undervoltage, overvoltage, interruption, are defined variations in terms of rms The other...
We propose and demonstrate an inline fiber optic power sensor (IFPS) resorting to embedded waveguide tap, which is formed traverse across the cladding core of a standard single-mode fiber. The tap was produced via single-step inscription based on femtosecond laser direct-writing method. A tightly focused pulsed beam has been particularly exploited suppress elongation along propagation direction, thereby improving cross-sectional symmetry created waveguide. fabricated stably combined with...