A5100427596- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced DC-DC Converters
- Photonic and Optical Devices
- Perovskite Materials and Applications
- Semiconductor materials and devices
- Multilevel Inverters and Converters
- Quantum Dots Synthesis And Properties
- Wireless Power Transfer Systems
- Chalcogenide Semiconductor Thin Films
- Parallel Computing and Optimization Techniques
- Advancements in Semiconductor Devices and Circuit Design
- Advanced battery technologies research
- Advanced Fiber Optic Sensors
- Advanced Memory and Neural Computing
- Supercapacitor Materials and Fabrication
- Low-power high-performance VLSI design
- Engineering Applied Research
- Advanced Fiber Laser Technologies
- Energy Harvesting in Wireless Networks
- Advanced Battery Technologies Research
- Silicon Carbide Semiconductor Technologies
- Matrix Theory and Algorithms
- Antenna Design and Analysis
- Microgrid Control and Optimization
Korea University
2020-2025
Pohang University of Science and Technology
2024
Korea Institute of Science & Technology Information
2017-2024
LG (South Korea)
1999-2024
Samsung (South Korea)
2001-2024
Changwon National University
2024
Gwangju Institute of Science and Technology
2018-2023
Korea Institute of Science and Technology
2016-2023
Soongsil University
2023
Myongji University
2020-2022
Lead-(Pb-) halide perovskite nanocrystals (NCs) are interesting nanomaterials due to their excellent optical properties, such as narrow-band emission, high photoluminescence (PL) efficiency, and wide color gamut. However, these NCs have several critical problems, the toxicity of Pb, its tendency accumulate in human body, phase instability. Although Pb-free metal (Bi, Sn, etc.) recently been reported possible alternatives, they exhibit poor electrical properties well abundant intrinsic defect...
Vehicle-to-Everything (V2X) creates many new opportunities in the area of wireless communications, while its feasibility on enabling vehicular positioning (VP) has not been fully explored despite importance for autonomous driving. This article aims at investigating whether V2X can help VP from different perspectives. We first explain V2X's critical advantages over other technologies (e.g., GPS, RADAR, LIDAR, and camera) suggest scenarios V2X-based VP. Then, we review state-of-the-art...
Abstract A device architecture with n‐type oxide/perovskite halide/p‐type oxide for the sputtering damage‐free semi‐transparent perovskite solar cells (PSCs) is reported. p‐type nickel (NiO x ) nanoparticle overlayer on a layer introduced to act as both hole transporting and buffer avoid damage during deposition of transparent conducting oxide. The NiO based PSCs exhibit superior durability under harsh conditions such high temperature power, enabling quality electrodes. With optimal...
Abstract The lithium–selenium (Li–Se) battery is a promising energy storage system for portable devices owing to its high density (2528 Wh L −1 ) and electrical conductivity (10 −3 S m ). main issue with Li–Se batteries their poor stability originating from the dissolution of Se‐containing compounds. Hence, many studies have focused on immobilization Se using protective layers prepared via ex situ or in approaches. However, these strategies are too complicated costly practical use. Herein,...
Abstract Reducing non‐radiative recombination and addressing band alignment mismatches at interfaces remain major challenges in achieving high‐performance wide‐bandgap perovskite solar cells. This study proposes the self‐organization of a thin two‐dimensional (2D) BA 2 PbBr 4 layer beneath three‐dimensional (3D) Cs 0.17 FA 0.83 Pb(I 0.6 Br 0.4 ) 3 , forming 2D/3D bilayer structure on tin oxide (SnO layer. process is driven by interactions between oxygen vacancies SnO surface hydrogen atoms...
In order to have high gain LLC resonant characteristics in the bidirectional power transfers, a Secondary (SLLC) converter with auxiliary inductors and capacitors is proposed. Auxiliary are connected secondary side of proposed converter. An 1kW prototyped SLLC for interfacing 400V DC buses built tested verify validity applicability
We propose a surveillance system of fiber optic cables with multi-channel distributed acoustic sensing (DAS) interrogator equipped optical rotary switch. By switching the connection between and multiple fiber-under-test, we take samples sensed vibration signal from fibers single pulse generator receiver. To identify source detected signal, separated monitoring process as 2-phases. In phase-1, monitor periodically in 3 second period, simply classify threat or non-threat to fiber-optic cable...
The optoelectronic performance of organic–inorganic halide perovskite (OIHP)-based devices has been improved in recent years. Particularly, solar cells fabricated using mixed-cations and mixed-halides have outperformed their single-cation single-halide counterparts. Yet, a systematic evaluation the microstructural behavior mixed perovskites is missing despite known composition-dependent photoinstability. Here, we explore inhomogeneity (FAPbI3)x(MAPbBr3)1–x advanced scanning probe microscopy...
We have fabricated a compact narrowband microstrip hairpin-comb filter for PCS applications by patterning double-sided YBCO films prepared pulsed laser deposition on 50-mm-diameter, 0.5-mm-thick LaAlO/sub 3/ wafer. To achieve the desired performance with size limitation, folded half-wavelength resonators are all oriented in same direction. design aid of commercially available full-wave EM simulator, ENSEMBLE, which is based method moments. The 11-pole has 0.6 dB minimum insertion loss and...
In this paper, a low profile LLC resonant converter with two planar transformers is proposed for slim SMPS (Switching Mode Power Supply). Design procedures and voltage gain characteristics on the transformer are described in detail. Two applied to connected series at primary parallel by center-tap winding secondary. Based theoretical analysis simulation results of characteristics, 300W LED TV power module designed tested.
Modern graphics processing units (GPUs) provide an unprecedented level of computing power. In this study, we present a high-performance, multi-GPU implementation the analytical nuclear gradient for Kohn-Sham time-dependent density functional theory (TDDFT), employing Tamm-Dancoff approximation (TDA) and Gaussian-type atomic orbitals as basis functions. We discuss GPU-efficient algorithms derivatives electron repulsion integrals exchange-correlation functionals within range-separated scheme....
A bidirectional secondary LLC resonant converter with auxiliary switches and an additional inductor is proposed to achieve the high gain characteristics of convertors. Auxiliary switches, a capacitor are connected in voltage side converter. The ac analysis operating investigated. 1kW prototype 400V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">DC</sub> buses designed tested confirm validity applicability