A5046594102- Thermal properties of materials
- Thermal Radiation and Cooling Technologies
- Thin-Film Transistor Technologies
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Advanced Thermoelectric Materials and Devices
- Gold and Silver Nanoparticles Synthesis and Applications
- ZnO doping and properties
- Semiconductor materials and devices
- Geomagnetism and Paleomagnetism Studies
- Heat Transfer and Optimization
- Orbital Angular Momentum in Optics
- Micro and Nano Robotics
- Photonic and Optical Devices
- Microfluidic and Bio-sensing Technologies
- Machine Learning in Materials Science
- Advanced Memory and Neural Computing
- Neural Networks and Reservoir Computing
- Advanced Sensor and Energy Harvesting Materials
- Fluid Dynamics and Heat Transfer
- Model Reduction and Neural Networks
- Solar-Powered Water Purification Methods
- Laser-Ablation Synthesis of Nanoparticles
- Optical properties and cooling technologies in crystalline materials
- Electrohydrodynamics and Fluid Dynamics
Kyung Hee University
2014-2025
University of Notre Dame
1981-2024
Kumoh National Institute of Technology
2020-2024
Samsung (South Korea)
2012-2022
Notre Dame of Dadiangas University
2016-2019
Global College
2016-2019
Seoul National University of Science and Technology
2012-2016
Advanced Institute of Convergence Technology
2013-2016
Seoul National University
2012-2013
Korea Institute of Science and Technology
2006
Current treatments for wound healing engage in passive processes and rarely participate stimulating skin cell behaviors active healing. Electric potential difference‐derived electrical fields (EFs) are known to modulate behaviors. Here, a piezoelectric dermal patch is developed that can be applied on site EF generated promote The one‐directionally aligned zinc oxide nanorod‐based generates upon mechanical deformations induced by animal motion, induces at the bed. In vitro vivo data...
The advent of nanophotonics enables the regulation thermal emission in momentum domain as well frequency domain. However, earlier attempts to steer a certain direction were restricted narrow spectrum or specific polarization, and thus their average (8-14 μm) emissivity (εav) angular selectivity nominal. Therefore, practical uses directional emitters have remained unclarified. Here, we report broadband, polarization-irrelevant, amplified from hollow microcavities covered with...
High Entropy Alloys (HEAs) have drawn great interest due to their exceptional properties compared conventional materials. The configuration of HEA system is considered a key superior properties, but exhausting all possible configurations atom coordinates and species find the ground energy state extremely challenging. In this work, we proposed quantum annealing-assisted lattice optimization (QALO) algorithm, which an active learning framework that integrates Field-aware Factorization Machine...
Abstract The increasing global temperatures have escalated the demand for indoor cooling, thus requiring energy-saving solutions. Traditional approaches often integrate metal layers in cooling windows to block near-infrared (NIR) sunlight, which, albeit effective, lack broad modulation of visible transmission and lead heat accumulation due sunlight absorption. Here, we address these limitations by developing using ZnS/MgF 2 multilayers, optimized through a binary optimization-based active...
A high-yield solution-processed ultrathin (<10 nm) trigonal tellurium (t-Te) nanowire (NW) is introduced as a new class of piezoelectric nanomaterial with six-fold higher constant compared to conventional ZnO NWs for high-volume power-density nanogenerator (NG). While determining the energy-harvesting principle in NG consisting t-Te NW, it theoretically and experimentally found that NW piezoelectrically activated only by creating strain its radial direction, along which has an asymmetric...
We demonstrated a new water motion active transducer (WMAT) without any external bias-voltage sources or additional processes, which critically limit the use of conventional passive capacitive transducers that convert mechanical into electric energy. From simple structure, we successfully turned on an LED using various kinds natural motion. The WMAT, has wide applicability, good potential to be candidate for generating sustainable
The nature of the bond is a dominant factor in determining thermal transport across interfaces. In this paper, we study role hydrogen interfaces between hard and soft materials with different surface functionalizations around room temperature using molecular dynamics simulations. Gold (Au) studied as material, four types organic liquids polarizations, including hexane (C5H11CH3), hexanamine (C6H13NH2), hexanol (C6H13OH), hexanoic acid (C5H11COOH), are used to represent materials. To bonds at...
Abstract Interfaces impede heat flow in micro/nanostructured systems. Conventional theories for interfacial thermal transport were derived based on bulk phonon properties of the materials making up interface without explicitly considering atomistic details, which are found critical to correctly describing boundary conductance. Recent theoretical studies predicted existence localized modes at can play an important role understanding transport. However, experimental validation is still...
β-Ga2O3 is a wide-bandgap semiconductor of significant technological importance for electronics, but its low thermal conductivity an impeding factor applications. In this work, interatomic potential developed based on deep neural network model to predict the and phonon transport properties. Our trained by ab initio energy surface atomic forces, which reproduces dispersion in good agreement with first-principles calculations. We are able use molecular dynamics (MD) simulations anisotropic...
Transparent radiative coolers can be used as window materials to reduce cooling energy needs for buildings and automobiles, which may contribute significantly addressing climate change challenges. However, it is difficult achieve high visible transparency performance simultaneously. Here, we design a visually transparent cooler on the basis of layered photonic structures using quantum computing-assisted active learning scheme, combines data production, machine learning, annealing in an...
Heat dissipation plays a crucial role in the performance and reliability of high-power GaN-based electronics. While AlN transition layers are commonly employed heteroepitaxial growth GaN-on-SiC substrates, concerns have been raised about their impact on thermal transport across GaN/SiC interfaces. In this study, we present experimental measurements boundary conductance (TBC) interfaces with varying thicknesses layer (ranging from 0 to 73 nm) at different temperatures. Our findings reveal...
Multi-band spectral filters that can transmit visible light but block UV and infrared in the solar spectrum are applicable to energy-saving windows. However, such usually designed consider normal incident only. Here, we report photonic structures allowing selective transmission wide angles using a quantum-computing-enhanced active learning scheme, which includes machine learning, quantum annealing, wave-optics simulation an iterative loop. We experimentally demonstrate optical...
Abstract Thin-film optical diodes are important elements for miniaturizing photonic systems. However, the design of relies on empirical and heuristic approaches. This poses a significant challenge identifying optimal structural models at given wavelengths. Here, we leverage quantum annealing-enhanced active learning scheme to automatically identify designs 130 nm-thick diodes. An diode is stratified volume diffractive film discretized into rectangular pixels, where each pixel assigned either...
Electrolyte-gated transistors (EGTs) are promising candidates as artificial synapses owing to their precise conductance controllability, quick response times, and especially low operating voltages resulting from ion-assisted signal transmission. However, it is still vague how ion-related physiochemical elements working mechanisms impact synaptic performance. Here, address the unclear correlations, we suggest a methodical approach based on electrochemical analysis using poly(ethylene oxide)...
Abstract The W-band is essential for applications like high-resolution imaging and advanced monitoring systems, but high-frequency signal attenuation leads to poor signal-to-noise ratios, posing challenges compact multi-channel systems. This necessitates distinct frequency selective surfaces (FSS) on a single substrate, complex task due inherent substrate resonance modes. In this study, we use digital metasurface platform design FSS glass optimized through binary optimization assisted by...
The Kelvin-Helmholtz waves have been observed along the Earth's low-latitude magnetopause and suggested to play a certain role in entry of solar wind plasma into magnetosphere.In situ observations KH (KHW) and, particular, nonlinear stage instability, i.e., rolled-up vortices (KHVs), reported occur preferentially for northward interplanetary magnetic field (IMF).Using Cluster data, we present first observation nonlinearly developed KHW during southward IMF.The analysis reveals that there is...
Solution‐processed oxide semiconductors (OSs) used as channel layer have been presented a solution to the demand for flexible, cheap, and transparent thin‐film transistors (TFTs). In order produce high‐performance long‐sustainable portable devices with solution‐processed OS TFTs, low‐operational voltage driving current is key issue. Experimentally, increasing gate‐insulator capacitances by high‐ k dielectrics in TFTs has significantly improved field‐effect mobility of TFTs. But, methodical...
Polymers with superior mechanical properties are desirable in many applications. In this work, polyethylene (PE) films reinforced exfoliated thermally reduced graphene oxide (TrGO) fabricated using a roll-to-roll hot-drawing process shown to have outstanding properties. The specific ultimate tensile strength and Young's modulus of PE/TrGO increased monotonically the drawing ratio TrGO filler fraction, reaching up 3.2 ± 0.5 109.3 12.7 GPa, respectively, 60× very low weight fraction 1%. These...
A unified understanding of interfacial thermal transport is missing due to the complicated nature interfaces which involves complex factors such as bonding, mixing, surface chemistry, crystal orientation, roughness, contamination, and disorder. This especially true for metal nonmetal incorporate multiple fundamental heat mechanisms elastic inelastic phonon scattering well electron coupling in across interface. All these jointly affect boundary conductance (TBC). As a result, experimentally...
The efficiency of thermal transport across solid interfaces presents large challenges for modern technologies such as management electronics. In this paper, we report the first demonstration significant enhancement by introducing interfacial nanostructures. Analogous to fins that have been used macroscopic heat transfer in exchangers, nanopillar arrays patterned at interface help enlarged effective contact area. Such a benefit depends on geometry (e.g., pillar height and spacing), boundary...
Abstract Li + electrolyte‐gated transistors (EGTs) have received much attention as artificial synapses for neuromorphic computing. EGTs, however, been still challenging to achieve long‐term synaptic plasticity, which should be linearly and symmetrically controlled with the magnitude of electrical potential at gate electrode. Herein, a fluoroalkylsilane (FAS) self‐assembled monolayer (SAM) is introduced channel‐electrolyte interlayer function sequential ion‐trapping in EGTs. It demonstrated...