A5100331456- Advancements in Battery Materials
- Supercapacitor Materials and Fabrication
- Advanced Battery Materials and Technologies
- Advanced Wireless Communication Technologies
- Radio Frequency Integrated Circuit Design
- Organic Electronics and Photovoltaics
- Integrated Circuits and Semiconductor Failure Analysis
- Silicon Carbide Semiconductor Technologies
- Advanced Battery Technologies Research
- Conducting polymers and applications
- Force Microscopy Techniques and Applications
- Microwave Engineering and Waveguides
- Wireless Communication Security Techniques
- Advanced Power Amplifier Design
- Electromagnetic Compatibility and Noise Suppression
- Advancements in Semiconductor Devices and Circuit Design
- Thin-Film Transistor Technologies
- Semiconductor materials and devices
- Cooperative Communication and Network Coding
- Advanced Cellulose Research Studies
- Electrostatic Discharge in Electronics
- Rocket and propulsion systems research
- Computational Fluid Dynamics and Aerodynamics
- IoT Networks and Protocols
- Organic Light-Emitting Diodes Research
Seoul National University
2000-2025
New Mexico State University
2021-2024
Entrust
2023
Qurient (South Korea)
2020-2023
University of Warwick
2020-2023
Korea Forest Service
2013-2020
Pukyong National University
2020
Korea Basic Science Institute
2016-2020
Chonbuk National University Hospital
2018-2020
Queen's University Belfast
2016-2019
Eco-friendly cellulose nanofibers (CNFs), a core constituent of cellulose, have garnered increasing attention as promising sustainable building block source for advanced materials in various application fields. In the present study, we successfully fabricate nanofiber paper from CNF suspension and explore its potential to separator membrane lithium-ion batteries. contrast macro/microscopic fibers that been commonly used typical papers, CNFs are characterized by nanometer-scale...
This research aims to develop low cost, sustainable, environmentally friendly, and high performance water-based drilling fluids (WDFs) using bentonite (BT), polyanionic cellulose (PAC), nanocrystals (CNCs). The effect of concentration BT, PAC, CNCs on the rheological filtration properties PAC/CNC/BT-WDFs was investigated. Eight empirical models were applied fit quantitatively fluid properties. Results showed that presence CNCs, BT improved WDFs. Among eight models, Sisko model performed best...
Lithium dendrite growth in solid electrolytes is one of the major obstacles to commercialization solid-state batteries based on garnet-type electrolytes. Herein, we propose a strategy that can simultaneously resolve both interface and electronic conductivity issues via simple one-step procedure provides multilayer protection at low temperature. We take advantage facile chemical conversion reaction, showing wet-coated SnF2 particles electrolyte effectively produces multifunctional composed...
The rapidly approaching smart/wearable energy era necessitates advanced rechargeable power sources with reliable electrochemical properties and versatile form factors. Here, as a unique promising storage system to address this issue, we demonstrate new class of heterolayered, one-dimensional (1D) nanobuilding block mat (h-nanomat) battery based on unitized separator/electrode assembly (SEA) architecture. SEAs consist wood cellulose nanofibril (CNF) separator membranes metallic current...
Non‐orthogonal multiple access (NOMA) in amplify‐and‐forward relay systems with partial selection (PRS) is investigated. More specifically, new exact closed‐form expressions for the outage probabilities at two users are derived, based on which an asymptotic analysis high signal‐to‐noise ratio (SNR) carried out. Additionally, to investigate performance gap between NOMA and orthogonal (OMA) schemes, a approximate expression SNR sum rate derived. Furthermore, relying results, impact of PRS...
Solid electrolytes are revolutionizing the field of lithium–metal batteries; however, their practical implementation has been impeded by interfacial instability between lithium metal electrodes and solid electrolytes. While various interlayers have suggested to address this issue in recent years, long-term stability with repeated deposition/stripping challenging attain. Herein, we successfully operate a high-power battery inducing preferred directional growth rationally designed interlayer,...
Recently, artificial synapses involving an electrochemical reaction of Li-ion have been attributed to remarkable synaptic properties. Three-terminal transistors utilizing intercalation exhibits reliable characteristics by exploiting the advantage non-distributed weight updates owing stable ion migrations. However, three-terminal configurations with large and complex structures impede crossbar array implementation required for hardware neuromorphic systems. Meanwhile, achieving adequate...
The use of smart home technology in the or building o_ers significant potential for energy savings. In this paper, we propose an management system based on wireless sensor networks. proposed is composed two main components: a network and intelligent gateway. Wireless sensors are used sensing transmitting electricity data remote monitoring control appliances provided to users through enables save by controlling web mobile devices.
The development of a method for the precise measurement strain fields in semiconductor devices has become critical requirement because electrical performances are greatly influenced by induced their structures. We applied scanning moiré fringe imaging to demonstrate quantitative mapping Si/Si1−xGex interfacial layer. field was measured at nano-meter scale spatial resolution, with detection precision 0.1%. maximum value be 1.1% ± 0.1%, which is consistent direct high-resolution transmission...
Numerous conjugated oligoacenes and polythiophenes are being heavily studied in the search for high-mobility organic semiconductors. Although many researchers have designed fused aromatic compounds as semiconductors thin-film transistors (OTFTs), pyrene-based with high mobilities on–off current ratios not yet been reported. Here, we introduce a new p-type semiconductor showing liquid crystal behavior. The thin film characteristics of this material investigated by varying substrate...
In this study, a cooperative non-orthogonal multiple access (NOMA) scheme is investigated in an underlay cognitive radio network. With aim, number of secondary users are concerned the NOMA, which user with strong channel gains properly selected (to act as relay) by multi-antenna base station () for assisting another poor presence primary Closed-form expressions outage probability network derived, based on asymptotic behaviours each assuming various realistic cases discussed. Our analytical...
Facile/sustainable utilization of sulfur active materials is an ultimate challenge in high-performance lithium–sulfur (Li–S) batteries. Here, as a membrane-driven approach to address this issue, we demonstrate new class polysulfide-breathing (capable reversibly adsorbing and desorbing polysulfides)/dual (electron ion) conductive, heterolayered battery separator membranes (denoted "MEC-AA separators") based on 0D (nanoparticles)/1D (nanofibers) composite mats. The MEC-AA fabricated through...
In this paper, the outage performance of nonorthogonal multiple access (NOMA) schemes in amplify-and-forward (AF) relay systems with partial selection is investigated. To end, closed-form expressions for probabilities at two users are derived, based on which an asymptotic analysis high signal-to-noise ratio (SNR) carried out to provide additional insights into system performance. particular, diversity order each user explicitly obtained. Numerical results illustrate impact considered NOMA...
We have applied scanning moiré fringe (SMF) imaging in transmission electron microscopy (STEM) to the quantitative measurement of a strain field introduced p-type channels transistors with an embedded Si1−xGex source and drain. The compressive parallel was revealed by SMF image. showed that profile extracted from image coincident independent high-resolution STEM In addition, we demonstrated can be performed for extended view is larger than half micrometer.
The problem with the application of conventional hyperthermia in oncology is firmly connected to dose definition, which conventionally uses concept homogeneous (isothermal) temperature target. Its imprecise control and complex evaluation primary barrier extensive clinical applications. aim this study was show basis problems misleading concept. A clear clarification proper must begin description limitations present doses surmounting limits oncologic has be based on applicability Eyring...
Fabricating full oxide garnet type Li6.4La3Zr1.4Ta0.6O12 (LLZTO)-based solid-state batteries has posed challenges, particularly in cosintering cathode composites. In this research, we achieve high-performance composites through ultrafast cosintering, facilitated by residual lithium as a sintering agent under an O2 atmosphere. These demonstrate compatibility with various materials including LiCoO2 and LiNi1/3Co1/3Mn1/3O2 LLZTO-based composite. Significantly, our findings reveal that stress on...
Nanometer-scale scanning moiré fringes (SMFs) of the hetero interfaces in Si/Si1−xGex/Si1−xGex/Si1−xGex multi-layers have been obtained by high-angle annular dark field transmission electron microscope. The SMFs that appeared at each interface were commensurate, when layers had no defects from epitaxial growth. SMF images showed Si substrate was tensilely strained, and it measured to be 0.2% relative unstrained substrate. In addition, found (220) lattice plane Si1−xGex linearly increased...