A5100747686- Physics of Superconductivity and Magnetism
- 2D Materials and Applications
- Power Systems and Technologies
- Catalytic Processes in Materials Science
- Smart Grid and Power Systems
- Advancements in PLL and VCO Technologies
- Quantum and electron transport phenomena
- Spectroscopy and Chemometric Analyses
- Iron-based superconductors research
- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- Advanced Battery Technologies Research
- Radio Frequency Integrated Circuit Design
- Conducting polymers and applications
- Power Systems and Renewable Energy
- Graphene research and applications
- Quantum many-body systems
- Advanced DC-DC Converters
- Photonic and Optical Devices
- Chalcogenide Semiconductor Thin Films
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Memory and Neural Computing
- Perovskite Materials and Applications
- Molecular Junctions and Nanostructures
- Engineering Applied Research
Dongguk University
2024-2025
Samsung (South Korea)
2018-2025
Ewha Womans University
2011-2024
Kootenay Association for Science & Technology
2024
Korea Advanced Institute of Science and Technology
2024
Korea University
2024
Institute for Basic Science
2015-2024
ON Semiconductor (United States)
2023-2024
Samsung (United States)
2023-2024
Pusan National University
2014-2023
A circuit for balancing Li-ion battery cells is proposed. This requires one small transformer and N + 3 bilateral switches to equalize the charging states of serially connected cells. The works as an energy carrier, select two unbalanced that require transfer from other cell. was tested a 12-cell under static, cyclic, dynamic charging/discharging conditions. Under static condition, power-transfer efficiency measured 80.4% at power 0.78 W; 4400-mA·h state charge (SOC) = 70 80% were equalized...
Lamellar single crystals grown in dilute solutions can be used as templates for tethered chain analysis. Two series of diblock copolymers, poly(ethylene oxide)-block-polystyrene (PEO-b-PS) and poly(l-lactic acid)-block-polystyrene (PLLA-b-PS), were model to generate PS blocks on the single-crystal basal surfaces. Controlled tunable reduced tethering density, σ, defined by σπRg2 (where σ is density equal reciprocal covered area Rg radius gyration this its end-free state at same conditions),...
Gaming on phones, tablets and laptops is very popular. Cloud gaming - where remote servers perform game execution rendering behalf of thin clients that simply send input display output frames promises any device the ability to play time. Unfortunately, reality wide-area network latencies are often prohibitive; cellular, Wi-Fi even wired residential end host round trip times (RTTs) can exceed 100ms, a threshold above which many gamers tend deem responsiveness unacceptable.
Non-equilibrium properties of quantum materials present many intriguing properties, among them athermal behavior, which violates the eigenstate thermalization hypothesis. Such behavior has primarily been observed in disordered systems. More recently, experimental and theoretical evidence for eigenstates, known as "quantum scars" emerged non-integrable disorder-free models one dimension with constrained dynamics. In this work, we show existence scar eigenstates investigate their dynamical...
Rapid and sensitive surface-enhanced Raman spectroscopy (SERS) for aflatoxin detection was employed development of the models to classify quantify levels in maize at concentrations 0 1,206 μg/kg. Highly effective SERS substrate (Ag nanosphere) prepared mixed with a sample extract measurement. Strong bands associated aflatoxins changes kernels induced by contamination were observed different spectroscopic regions. The k-nearest neighbors (KNN) classification model yielded high accuracy lower...
A modularized design of an active charge equalizer and a equalization algorithm for Li-ion battery pack are proposed in this paper. The consists one module-balancing circuit M cell-balancing circuits, where is the number modules pack. Each balancing uses inductor that placed bridge four bidirectional switches works as energy carrier, cell/module access network enables transfer from to another cell or module. between can be performed simultaneously with cells, so significantly reduce time...
Moir\'e systems offer an exciting playground to study the many-body effects of strongly correlated electrons in regimes that are not easily accessible conventional material settings. Motivated by a recent experiment on ${\text{WSe}}_{2}/{\text{WS}}_{2}$ moir\'e bilayers [Y. Tang et al., Nature (London) 579, 353 (2020)], which realized triangular superlattice with small hopping (of approximately 10 Kelvin), tunable density holes, we explore Hubbard model lattice for intermediate temperatures...
Although most quantum systems thermalize locally on short time scales independent of initial conditions, recent developments have shown this is not always the case. Lattice geometry and mechanics can conspire to produce constrained dynamics associated glassy behavior, a phenomenon that falls outside rubric eigenstate thermalization hypothesis. Constraints "fragment" many-body Hilbert space due which some states remain insulated from others system fails attain thermal equilibrium. Such...
As more services have come to rely on sensor data such as audio and photos collected by mobile phone users, verifying the authenticity of this has become critical for service correctness. At same time, clients require flexibility tradeoff fidelity they contribute resource efficiency or privacy. This paper describes YouProve, a partnership between device's trusted hardware software that allows untrusted client applications directly control upload verify meaning source is preserved. The key...
In this paper, we proposed an improved YOLOv3-based neural network for De-identification technology. The existing YOLOv3 is a with fast speed and performance recently. Most surveillance system using CCD cameras simultaneously store images from installed in multiple locations. such environment, the use of deep learning requires method detecting objects through single inference engine plurality image. If hardware used each camera channel, cost building increases significantly. Therefore, field...
High-harmonic radiation emitted from molecules in a strong laser field contains information on molecular structure and dynamics. When multiple orbitals participate high-harmonic generation, resolving the contribution of each orbital is crucial for understanding dynamics extending spectroscopy to more complicated molecules. We show that two-dimensional can resolve two highest-occupied orbitals, HOMO HOMO-1, aligned By application an orthogonally polarized two-color consists fundamental its...
Graphenes have emerged as a highly promising, two-dimensional engineered nanomaterial that can possibly substitute carbon nanotubes. They are being explored in numerous R&D and industrial applications laboratories across the globe, leading to possible human environmental exposures them. Yet, there no published data on graphene occupational settings readily available methods for their detection quantitation exist. This study investigates first time potential exposure of workers research...
The size of nanoparticles is considered to influence their toxicity, as smaller-sized should more easily penetrate the cell and exert toxic effects. However, conflicting results unstandardized methodology have resulted in controversy these size-dependent Here, we introduce a unique approach study such effects present evidence that reliably supports this general assumption along with elucidation underlying cytotoxic mechanism.We prepared physically characterized size-controlled (20-50 nm)...
This article investigates the foaming process of bi-cellular polystyrene foams blown with n-butane and water in extrusion. The foam structure has two types cells: large cells ranging from 0.1 to 1.2 mm small size about 5% 50% average cell size, which constitute more than 90% total volume. A outstanding heat insulation property. In order generate a structure, water-blowing technology was used. technique is environmentally benign economical since butane are used as blowing agents. Despite...
Parallel to CO2 emission, NOx emission has become one of the menacing problems that seek a simple, durable, and high-efficiency deNOx catalyst. Herein, we demonstrated simple syntheses platinum group metal nanoparticle-decorated f-BNNT (PGM = Pd, Pt, Rh, stands for -OH-functionalized boron nitride nanotubes) as catalyst efficient selective reduction NO by CO at low-temperature conditions. PGM/f-BNNT with low amount noble nanoparticles (0.7-0.8 wt %) presents very catalytic activity well...
Aflatoxins and fumonisins, commonly found in maize maize-derived products, frequently co-occur can cause dangerous illness humans animals if ingested large amounts. Efforts are being made to develop suitable analytical methods for screening that rapidly detect mycotoxins order prevent through early detection. A method classifying contaminated by applying hyperspectral imaging techniques including reflectance the visible near-infrared (VNIR) short-wave infrared (SWIR) regions, fluorescence...