A5028608241- Conducting polymers and applications
- Multiferroics and related materials
- Advanced Sensor and Energy Harvesting Materials
- Advanced Condensed Matter Physics
- Supercapacitor Materials and Fabrication
- Electron and X-Ray Spectroscopy Techniques
- Surface and Thin Film Phenomena
- Magnetic and transport properties of perovskites and related materials
- Integrated Circuits and Semiconductor Failure Analysis
- Stock Market Forecasting Methods
- Time Series Analysis and Forecasting
- Transition Metal Oxide Nanomaterials
- Energy Load and Power Forecasting
- Electronic and Structural Properties of Oxides
- Tropical and Extratropical Cyclones Research
- Advanced Thermoelectric Materials and Devices
- Organic Electronics and Photovoltaics
- Inorganic Chemistry and Materials
- Coding theory and cryptography
- Ion-surface interactions and analysis
- Chaos-based Image/Signal Encryption
- Topological Materials and Phenomena
- Cryptographic Implementations and Security
- Advancements in Photolithography Techniques
- Flame retardant materials and properties
Wonkwang University
2023-2025
Seoul National University
2025
Korea University
2024
Max Planck Institute for Chemical Physics of Solids
2021-2023
Tribeca Film Institute
2023
Yonsei University
2023
Max Planck Institute for the Physics of Complex Systems
2022
National Research Institute of Cultural Heritage
2013
ABSTRACT In pursuit of multifunctional flame‐retardant coatings, a layer‐by‐layer (LbL) assembly was used to create hybrid nanocoatings by alternating the deposition positively charged chitosan (CH) and negatively sodium lignosulfonate (Lg). Carbon nanotubes (CNT), dispersed in an Lg solution, were incorporated as robust reinforcements polymer nanocomposites. Their high aspect ratio dense network within CH/CNT‐Lg layers resulted coatings that notably thicker heavier compared those...
Our studies evidence an anisotropic magnetic order below $T_N = 32$~K. Susceptibility data in small fields of about 1~T reveal antiferromagnetic (AFM) for $H \perp c$, whereas \parallel c$ the are reminiscent a field-induced ferromagnetic (FM) structure. At low temperatures and field-dependent magnetization AC susceptibility metamagnetic transition at $H^+ 5$~T, which is absent c$. We assign this to from planar cycloidal spin structure fan-like arrangement above $H^+$. A fully FM polarized...
Abstract In half-metallic systems, electronic conduction is mediated by a single spin species, offering enormous potential for spintronic devices. Here, using microscopic-area angle-resolved photoemission, we show that spin-polarised two-dimensional hole gas naturally realised in the polar magnetic semiconductor AgCrSe 2 an intrinsic self-doping at its CrSe -terminated surface. Through comparison with first-principles calculations, unveil striking role of spin-orbit coupling surface gas,...
The layered delafossite metal PdCrO[Formula: see text] is a natural heterostructure of highly conductive Pd layers Kondo coupled to localized spins in the adjacent Mott insulating CrO[Formula: layers. At high temperatures, T, it has T-linear resistivity which not seen isostructural but nonmagnetic PdCoO[Formula: text]. strength coupling known, as-grown crystals are extremely purity and Fermi surface both very simple experimentally known. It therefore an ideal material platform investigate...
Abstract Progress in magnetoelectric materials is hindered by apparently contradictory requirements for time‐reversal symmetry broken and polar ferroelectric electronic structure common ferromagnets antiferromagnets. Alternative routes can be provided recent discoveries of a breaking anomalous Hall effect (AHE) noncollinear magnets altermagnets, but hitherto reported bulk are not polar. Here, the authors report observation spontaneous AHE doped AgCrSe 2 , layered semiconductor with an...
A novel self-healing and antifreezing/antidrying conductive eutectohydrogel, ideal for wearable multifunctional sensors supercapacitors, is reported. Conductive eutectohydrogel with facilely tunable mechanical performance obtained by incorporation of trehalose phytic acid as reversible cross-linkers into a polyacrylamide network, forming the dynamic hydrogen bonding electrostatic interactions. Furthermore, combined use deep eutectic solvent water ensures air stability well characteristics....
Thermoelectric (TE) materials have been considered as a promising energy harvesting technology for sustainably providing power to electronic devices. In particular, organic-based TE that consist of conducting polymers and carbon nanofillers make large variety applications. this work, we develop organic nanocomposites via successive spraying intrinsically conductive such polyaniline (PANi) poly(3,4-ethylenedioxy- thiophene):poly(styrenesulfonate) (PEDOT:PSS) nanofillers, single-walled...
Electronic structure calculations in the framework of density functional theory are based on complex numerical codes which used a multitude applications. Frequently, existing experimental information is as gauge for reliability such codes. However, their results depend both chosen exchange-correlation energy and specific implementation Kohn-Sham equations. The only way to disentangle these two items direct comparison or more electronic Here, we address achievable accuracy precision total...
Polymer solar cells (PSCs) have attracted increasing attention in recent years. The rapid progress and mounting interest suggest the feasibility of PSC commercialization. However, critical issues such as stability weak nature their interfaces posses quite a challenge. In context improving stability, PSCs with inverted geometry consising inorganic oxide layer acting an n-buffer offer panacea. Zinc (ZnO) is one most preferred semiconducting wide band gap oxides efficient cathode that...
초 록 이산화질소(NO2) 농도에 따른 전통직물의 손상특성을 정량적으로 확인하고자 가스 열화실험을 수행하였다.견, 면, 모시, 삼베의 무염색직물 시편, 천연염색(적색
The stability of the double-layered antiferromagnets and their magnonic properties are investigated by considering two model systems, linear chain (LC) more complex railroad trestle (RT) geometry, a real example chromium nitride CrN. spin-paired order ($\cdots{+}{+}{-}{-}\cdots$) in LC requires an alternation ferromagnetic antiferromagnetic (AFM) interactions, while analogous RT can be stable even for all magnetic exchange interactions being AFM. rock-salt structure CrN evokes clear...
Progress in magnetoelectric materials is hindered by apparently contradictory requirements for time-reversal symmetry broken and polar ferroelectric electronic structure common ferromagnets antiferromagnets. Alternative routes could be provided recent discoveries of a breaking anomalous Hall effect noncollinear magnets altermagnets, but hitherto reported bulk are not polar. Here, we report the observation spontaneous doped AgCrSe$_2$, layered semiconductor with an antiferromagnetic coupling...
Abstract The renewable energy industry through offshore wind has been growing rapidly with increasing project capacities. To accommodate this huge transition demand, the projects are moving towards open sea and deeper water. In line trend, various design development innovation on Floating Offshore Wind Turbine (FOWT) technology progressing to improve feasibility as well economy of projects. Mooring system is part major costs components in (FOW). Reducing mooring loads desirable create more...
Long-term time series forecasting (LTSF) is a challenging task that has been investigated in various domains such as finance investment, health care, traffic, and weather forecasting. In recent years, Linear-based LTSF models showed better performance, pointing out the problem of Transformer-based approaches causing temporal information loss. However, approach also limitations model too simple to comprehensively exploit characteristics dataset. To solve these limitations, we propose...
The layered delafossite metal PdCrO$_2$ is a natural heterostructure of highly conductive Pd layers Kondo coupled to localized spins in the adjacent Mott insulating CrO$_2$ layers. At high temperatures $T$ it has $T$-linear resistivity which not seen isostructural but non-magnetic PdCoO$_2$. strength coupling known, as-grown crystals are extremely purity and Fermi surface both very simple experimentally known. It therefore an ideal material platform investigate 'Planckian metal' physics. We...
Abstract Photoresist (PR) profiles tend to have deformation and shrinkage with typical transmission electron microscopy (TEM) sample preparation methods using a focused ion beam scanning microscope (FIB-SEM). As the temperature increases during TEM preparation, it may lead in PR profiles. In this study, we analyze impact when performing at cold cryo-FIB minimize issues. To test methodology, process was performed under different conditions. From these experiments, results full cryo conditions...
Long-term time series forecasting (LTSF) is a challenging task that has been investigated in various domains such as finance investment, health care, traffic, and weather forecasting. In recent years, Linear-based LTSF models showed better performance, pointing out the problem of Transformer-based approaches causing temporal information loss. However, approach also limitations model too simple to comprehensively exploit characteristics dataset. To solve these limitations, we propose...
Using ab initio calculations based on the correlated band theory, we have investigated quasi-one-dimensional chain system $β$-V$_2$O(PO$_4$), showing both charge and spin orderings. Even in uncorrelated region, pure transition from tetragonal to monoclinic structure leads a sizable difference between two types of V ions, regardless magnetic orders. In ferrimagnetic phase, inclusion on-site Coulomb repulsion $U$ full orbital-polarization V1 ($t_{2g}^{3\uparrow}$, $S=\frac{3}{2}$) V2...
Abstract In semiconductor manufacturing technology, copper has been widely used for BEOL process due to better conductivity than aluminum. TEM (Transmission Electron Microscopy) characterization played in key role understand the of manufacturing. Gallium base Focused Ion Beam (FIB) is on sample preparation. The experiment impact gallium which from preparation Cu layer was performed. In-situ studies have shown real time material characteristic at various temperature [1]. We observed...
본 연구에서는 pH 센서의 우수한 전기화학적 성능을 위하여 1차원적 나노필라 어레이를 가진 유연한 폴리아닐린 필름 전극을 개발하였다. 소프트 리소그래피 방법을 사용하여 정밀하게 배열된 어레이 기판을 제조하였다. 높은 전기적 전도성을 위해 스퍼터링 공정을 통한 표면에 금을 증착시켰다. 이후, 금 필름에 아닐린 단량체를 전기화학적으로 중합을 시켰다. 순환 전압전류법을 폴리아닐린의 전기 증착은 주사 속도 및 횟수를 조절함으로써 체계적으로 연구되었다. 상기 최적화 실험을 통하여 제작된 전극은 민감도, 반복성, 선택성, 내구성을 포함하여 센서 나타내었다. 또한, 기계적으로 구부러진 상태에서 전극의 성능이 유지됨을 확인하였다. We developed a flexible polyaniline film with one-dimensional nanopillar array to achieve high electrochemical performance of sensor. Soft...