A5101692511- Atomic and Subatomic Physics Research
- Advanced MRI Techniques and Applications
- Advanced NMR Techniques and Applications
- Functional Brain Connectivity Studies
- EEG and Brain-Computer Interfaces
- Physics of Superconductivity and Magnetism
- NMR spectroscopy and applications
- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
- Cardiac electrophysiology and arrhythmias
- Magnetic Field Sensors Techniques
- Neural dynamics and brain function
- Blind Source Separation Techniques
- Quantum and electron transport phenomena
- Advanced Memory and Neural Computing
- Perovskite Materials and Applications
- Electron Spin Resonance Studies
- Cardiac Imaging and Diagnostics
- Mechanical and Optical Resonators
- Conducting polymers and applications
- Non-Invasive Vital Sign Monitoring
- Technology and Data Analysis
- Force Microscopy Techniques and Applications
- Semiconductor materials and interfaces
- Quantum Dots Synthesis And Properties
Korea Research Institute of Chemical Technology
2020-2024
Yonsei University
1999-2023
Hannam University
2011-2022
Chungbuk National University
2021-2022
Korea Research Institute of Standards and Science
2012-2021
Korea University of Science and Technology
2012-2021
University of Science and Technology
2021
Materials Research Center
2021
Yuhan University
2020
Seoul Institute
2019
Porous planar structure, as a new concept of low temperature processing ETL, enables to achieve unprecedented PCE in flexible unit cells and large area modules.
Using a planar and flexible metamaterial (MM), we obtained the low-frequency perfect absorption even with very small unit-cell size in snake-shape structure. These shrunken, deep-sub-wavelength thin MM absorbers were numerically experimentally investigated by increasing inductance. The periodicity/thickness (the figure of merit for absorption) is achieved to be 10 2 single-snake-bar 5-snake-bar structures, respectively. ratio between periodicity resonance wavelength (in mm) close 1/12 1/30...
Iridium on vertical graphene nano-hills emerges as a highly active and robust catalyst for the total water splitting reaction in both acidic alkaline electrolytes.
A novel electroless Pt deposition method was exploited by employing the galvanic replacement process occurring between Mn3O4 surface and PtCl42– complexes. The newly discovered provides a simple protocol to produce catalytic nanocomposite, in which high density of ultrafine nanocrystals is stably immobilized homogeneously dispersive state on nanoparticles. When eletrocatalytic activity tested for oxygen reduction reaction, limits rate overall proton-exchange membrane fuel cells, resulting...
While brain computer interface (BCI) can be employed for patients and healthy subjects, there are problems that must resolved before BCI useful to the public. In most popular motor imagery system, a significant number of target users (called "BCI-Illiterates") cannot modulate their neuronal signals enough use system. This causes performance variability among subjects even sessions within subject. The mechanism such BCI-Illiteracy possible solutions still remain determined. Gamma oscillation...
The nitrogen-vacancy ($\mathrm{N}$-$V$) defect in diamond is a versatile quantum sensor, being able to measure physical quantities such as magnetic field, electric temperature, and pressure. In the present work, we demonstrate multiplexed sensing of field temperature using N-V ensemble diamond. dual-frequency-driving technique employ based on frequency-division multiplexing, which enables both measurables real time. pair $\mathrm{N}$-$V$ resonance frequencies for dual-frequency driving must...
Abstract The need for miniaturized and high-performance devices has attracted enormous attention to the development of quantum silicon nanowires. However, preparation abundant quantities nanowires with effective quantum-confined dimension remains challenging. Here, we prepare highly dense vertically aligned sub-5 nm length/diameter aspect ratios greater than 10,000 by developing a catalyst-free chemical vapor etching process. We observe an unusual lattice reduction up 20% within ultra-narrow...
In traditional brain–computer interface (BCI) studies, binary communication systems have generally been implemented using two mental tasks arbitrarily assigned to "yes" or "no" intentions (e.g., arithmetic calculation for "yes"). A recent pilot study performed with one paralyzed patient showed the possibility of a more intuitive paradigm BCI communications, in which patient's internal yes/no were directly decoded from functional near-infrared spectroscopy (fNIRS). We investigated whether...
CoP is a promising catalyst material to replace noble metals in water electrolysis. To further explore the potential of hydrogen evolution reaction (HER) and oxygen (OER), we utilize vertical graphene nanohills (VGNHs) that are known enhance catalytic performances through superaerophobicity. Unique chrysanthemum-like structures formed on VGNHs facile, one-step electrodeposition reaction. Because highly conductive VGNH support modified nanostructures, optimized CoP/VGNHs hybrid exhibits...
We demonstrate that the use of negative feedback extends detection bandwidth an atomic magnetometer in a spin-exchange relaxation free (SERF) regime. A flat-frequency response from zero to 190 Hz was achieved, which is nearly three-fold enhancement while maintaining sensitivity, 3 fT/Hz1/2 at 100 Hz. With extension bandwidth, linear correlation between measured signals and magne-tocardiographic field synthesized for comparison increased 0.21 0.74. This result supports feasibility measuring...
In our study, to optimize the electron-hole balance through controlling electron transport layer (ETL) in QD-LEDs, four materials (ZnO, ZnGaO, ZnMgO, and ZnGaMgO NPs) were synthesized applied QD-LEDs as ETLs. By doping ZnO NPs with Ga, electrons easily inject due increased Fermi level of NPs, Mg is further doped, valence band maximum (VBM) deepens blocks holes more efficiently. Also, at interface QD/ETLs, reduces non-radiative recombination by reducing oxygen vacancy defects on surface NPs....
Electroencephalography (EEG) has relatively poor spatial resolution and may yield incorrect brain dynamics distort topography; thus, high-density EEG systems are necessary for better analysis. Conventional methods have been proposed to solve these problems, however, they depend on parameters or models that not simple address. Therefore, new approaches enhance while maintaining its data properties. In this work, we investigated the super-resolution (SR) technique using deep convolutional...
Currently, signal amplification by reversible exchange (SABRE) using para-hydrogen is an attractive method of hyperpolarization for overcoming the sensitivity problems nuclear magnetic resonance (NMR) spectroscopy. Additionally, SABRE, spin order para-hydrogen, can be applied in reaction monitoring processes organic chemistry reactions where a small amount reactant exists. The system created integrating SABRE and benchtop NMR ideal combination identifying amounts materials middle reaction....
Abstract The signal amplification by reversible exchange (SABRE) technique is a very promising method for increasing magnetic resonance (MR) signals. SABRE can play particularly large role in studies with low or ultralow field because they suffer from signal-to-noise ratio. In this work, we conducted real-time superconducting quantum interference device (SQUID)-based nuclear (NMR)/magnetic imaging (MRI) microtesla-range using the after designing bubble-separated phantom. A maximum...
Accurate identification of patients with acute coronary syndrome (ACS) is often difficult especially when an electrocardiogram (ECG) does not show typical elevation ST segment. The aim the present study was therefore to evaluate efficacy magnetocardiography (MCG) for diagnosis ACS in chest pain presenting without segment elevation.In retrospective 364 suspected were selected. Significant artery disease (CAD) defined as a stenosis > or =50% at least one 16 segments 3 major arteries and their...
Computation of headmodel and sourcemodel from the subject's MRI scan is an essential step for source localization magnetoencephalography (MEG) (or EEG) sensor signals. In absence a real scan, pseudo (i.e., associated sourcemodel) often approximated available standard template or pool scans considering digitized head surface. present study, we two types using with focus on MEG imaging. The first was rank MRI; that is, in dataset having lowest objective registration error (ORE) after being...
Magnetoencephalography (MEG) is a functional neuroimaging technique that noninvasively detects the brain magnetic field from neuronal activations. Conventional MEG measures signals using superconducting quantum interference devices (SQUIDs). SQUID-MEG requires cryogenic environment involving bulky non-magnetic Dewar flask and consumption of liquid helium, which restricts variability sensor array gap between cortical sources sensors. Recently, miniature optically pumped magnetometers (OPMs)...