A5101815242- Advanced Chemical Sensor Technologies
- Gas Sensing Nanomaterials and Sensors
- Advanced Sensor and Energy Harvesting Materials
- Advanced Memory and Neural Computing
- Advancements in Battery Materials
- Ferroelectric and Negative Capacitance Devices
- Engineering Applied Research
- Electrocatalysts for Energy Conversion
- Transition Metal Oxide Nanomaterials
- Ferroelectric and Piezoelectric Materials
- ZnO doping and properties
- Analytical Chemistry and Sensors
- Multiferroics and related materials
- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Conducting polymers and applications
- Semiconductor materials and devices
- Marine and Coastal Research
- Photoreceptor and optogenetics research
- Perovskite Materials and Applications
- Electrical Contact Performance and Analysis
- Biosensors and Analytical Detection
- Additive Manufacturing Materials and Processes
- Fuel Cells and Related Materials
- Education, Safety, and Science Studies
Seoul National University
2022-2024
Inha University
2024
Kyung Hee University Hospital at Gangdong
2018
Korea Railroad Research Institute
2013
Numerous efforts for emulating organ systems comprised of multiple functional units have driven substantial advancements in bio-realistic electronics and systems. The resistance change behavior observed diffusive memristors shares similarities with the potential biological neurons. Here, threshold switching phenomenon Ag-incorporated organometallic halide perovskites is utilized to demonstrate functions afferent Halide perovskites-based show a low voltage ≈0.2 V little variation, attributed...
Abstract Ferroelectric thin films have recently received unprecedented attention due to the need miniaturize electronic circuit devices. Synthesis and deposition processes along with theoretical calculations are improved remarkably realize stable ferroelectric up nanometer thickness. However, even technological advances, it is still difficult overcome size effect of ferroelectrics, so research being conducted achieve ferroelectricity in unit‐cell thicknesses thinner than typical critical...
Atomically doped Au in NiFe-LDH effectively passivates defect sites, substantially enhancing overall PEC water oxidation properties.
Two-dimensional (2D) halide perovskites have become a promising class of memristive materials due to their low power consumption, compositional versatility, and microstructural anisotropy in electronics. However, implementing high-performance resistive random-access memory requires higher reliability moisture resistance. To address these issues, component studies attempts improve the phase stability been reported but not able achieve sufficient reliability. Here, highly textured thin films...
Abstract Ferroelectric tunnel junctions (FTJs) have been the subject of ongoing research interest due to its fast operation based on spontaneous polarization direction ultrathin ferroelectrics and simple two-terminal structure. Due advantages FTJs, such as non-destructive readout, speed, low energy consumption, high-density integration, they recently considered a promising candidate for non-volatile next-generation memory. These characteristics are essential meet increasing demand...
Micro-light-emitting diodes (μLEDs) have gained significant interest as an activation source for gas sensors owing to their advantages, including room temperature operation and low power consumption. However, despite these benefits, challenges still exist such a limited range of detectable gases slow response. In this study, we present blue μLED-integrated light-activated sensor array based on SnO
Controlling phase transitions in correlated materials yields emergent functional properties, providing new aspects to future electronics and a fundamental understanding of condensed matter systems. With vanadium dioxide (VO2 ), representative material, an approach control metal-insulator transition (MIT) behavior is developed by employing heteroepitaxial structure with ferroelectric BiFeO3 (BFO) layer modulate the interaction electrons. Owing defect-alleviated interfaces, enhanced coupling...
Abstract Deformable lithium‐ion batteries (LIBs) can serve as the main power sources for flexible and wearable electronics owing to their high energy capacity, reliability, durability. The pivotal role of cathodes in LIB performance necessitates development mechanically free‐standing stretchable cathodes. This study demonstrates a promising strategy generate deformable with electrical conductivity by forming 3D interconnected elastomeric networks. Beginning physically crosslinked polymer...
The kinetics of interfacial ion insertion govern the uniformity electrochemical reactions, playing a crucial role in lithium-ion battery performance. In two-dimensional lithium-conducting layered-oxide particles, variation rates across channels remains unclear due to poorly defined crystal orientation at solid-liquid interface and solid-state-lithium-diffusion length. This ambiguity complicates understanding inhomogeneous lithium-insertion activation. A systematic study requires...
Hydrogen (H
Preventing ferroelectric materials from losing their ferroelectricity over a low thickness of several nanometers is crucial in developing multifunctional nanoelectronics. Epitaxially grown 5 at. % yttrium-doped Hf0.5Zr0.5O2 (YHZO) thin films exhibit an atomically smooth surface, ability to maintain even at 10 nm, and excellent insulating properties, making them suitable for use as gate oxides film transistors (FeTFTs). Through the epitaxial growth YHZO/La0.67Sr0.33MnO3 (LSMO)/SrTiO3 (STO)...
This paper describes the structural analysis, load tests and combined stress of bogie frame. It seeks to identify safety frame when is assembled on train a service implemented. The consists frame, suspension, wheels, brakes transmission, etc. can be considered as most important part bogie. analysis were evaluated using JIS E 4207 standards performance test for urban rail vehicles.
An evaluation was carried out by applying a load to the underframe of freight car determine structural strength carbody newly manufactured for transportation. This study is aimed at evaluating safety under maximum conditions. The use in rail designed mainly with SM490A steel and ASTM A441 production. rolling stock principal structure supporting major equipment freight. Thus, this very important. Both analysis loading test were performed condition. Prior strength, finite element method...
Exploring a computing paradigm that blends memory and computation functions is essential for artificial synapses. While memristors synapses are widely studied due to their energy-efficient structures, random filament conduction in general makes them less preferred endurability long-term synaptic modulation. Herein, the topotactic phase transition (TPT) brownmillerite-phased (110)-SrCoO
The drive shaft of the bi-modal tram has been designed and built into independent wheel drive; all driving wheels are driven by electric motor-gearbox sets independently, in order to make low floor provide old handicapped with easy access, remove differential gears reduce turning radius. This paper was aimed evaluate torques on shafts while running slope way test track, at maximum speed public roadway. On basis measured shafts, torsion characteristics were discussed this paper.
Background The purpose of this study was to identify the degree home isolation and determine what is needed for an effective through experience with that has been found be in close contact persons MERS-confirmed patient. Methods We conducted a questionnaire survey employees at university hospital Seoul, Korea, which were classified as MERS patient who visited emergency room June 2015. items prepared by referring response guideline, 3-3 edition. Results There 81respondents total. At time...