Ewha Womans University · Medicine
Professor Young Ju Kim's research lab specializes in advanced electromagnetic materials and biomedical applications, focusing on the design and characterization of metamaterial-based absorbers for microwave and terahertz frequencies. The lab investigates ultrathin, broadband, and polarization-insensitive absorbers using resonant structures and embedded resistors to achieve near-perfect absorption through impedance matching and magnetic field cancellation. In parallel, the lab explores the biological and clinical implications of microbial communities and oxidative stress, particularly in relation to vaginal microbiome composition and mental health screening using validated psychological tools. The integration of materials science with biomedical engineering defines the lab’s interdisciplinary approach.
Figures are computed from collected data and may differ slightly.
We propose polarization-independent and dual-broadband metamaterial absorbers at microwave frequencies. This is a periodic meta-atom array consisting of metal-dielectric-multilayer truncated cones. We demonstrate not only one broadband absorption from the fundamental magnetic resonances but additional broadband absorption in high-frequency range using the third-harmonic resonance, by both simulation and experiment. In simulation, the absorption was over 90% in 3.93-6.05 GHz, and 11.64-14.55 GHz.
We numerically and experimentally studied an ultrathin and broadband perfect absorber by enhancing the bandwidth with embedded resistors into the metamaterial structure, which is easy to fabricate in order to lower the Q-factor and by using multiple resonances with the patches of different sizes. We analyze the absorption mechanism in terms of the impedance matching with the free space and through the distribution of surface current at each resonance frequency. The magnetic field, induced by the
These findings suggest that LPC induces the overproduction of NO, which may increase the oxidative stress on endothelial cells and lead to endothelial cell injury.
This result suggests that Lactobacillus abundance-based classification of vaginal fluid may reveal the microbiome associated with PTB. Further studies are needed to investigate the mechanism underlying the link between the microbiome and PTB.
The Korean version of the GHQ-12 could be used to screen for individuals at high risk of mental disorders, namely mood and anxiety disorders.
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