A5084203861- Advanced Thermoelectric Materials and Devices
- Additive Manufacturing and 3D Printing Technologies
- X-ray Diffraction in Crystallography
- Magnetic and transport properties of perovskites and related materials
- Pigment Synthesis and Properties
- Bone Tissue Engineering Materials
- Recycling and utilization of industrial and municipal waste in materials production
- Crystallization and Solubility Studies
- Ferroelectric and Piezoelectric Materials
- Thermal Radiation and Cooling Technologies
- Advanced ceramic materials synthesis
- Advanced Condensed Matter Physics
- Thermal properties of materials
- Advanced Thermodynamics and Statistical Mechanics
- Brake Systems and Friction Analysis
- Radioactive element chemistry and processing
- Cultural Heritage Materials Analysis
- Electronic and Structural Properties of Oxides
- Chemical Synthesis and Characterization
- Graphene research and applications
- Crystal Structures and Properties
- 2D Materials and Applications
- Context-Aware Activity Recognition Systems
- Layered Double Hydroxides Synthesis and Applications
- Internet of Things and Social Network Interactions
Korea Institute of Ceramic Engineering and Technology
2015-2025
Kyung Hee University
2009-2020
Daewoo Electronics (South Korea)
2019
Hankuk University of Foreign Studies
2013-2017
Chosun University
2016
Soongsil University
2015
Incheon Medical Center
2014
Severance Hospital
2013
Andong National University
2012
Samsung (South Korea)
2011
It is of critical importance to improve toughness, strength, and wear-resistance together for the development advanced structural materials. Herein, we report on synthesis unoxidized graphene/alumina composite materials having enhanced by a low-cost environmentally benign pressure-less-sintering process. The wear resistance composites was increased one order magnitude even under high normal load condition (25 N) as result tribological effect graphene along with fracture toughness (KIC)...
Abstract This study aims to understand Korean students’ motivations for studying in US graduate schools. For this purpose, I conducted in‐depth interviews with 50 students who were enrolled a research‐centered university at the time of interview. In these interviews, sought how their are connected not only family, school, and occupational backgrounds, but also stratification global higher education. Theoretically, paper attempts combine concept positional competition Pierre Bourdieu’s theory...
This study analyzes the learning and cultural experiences of Korean graduate students in United States. Based on 50 qualitative interviews, focuses how global knowledge power relations language determine their education a transnational system. At theoretical level, criticizes both functionalist approaches that limit analysis to socialization processes pragmatic analyses seek solve problems adaptation. Rejecting these perspectives, this instead series based operate environment shape attitudes...
ZnO, a wide bandgap semiconductor, has attracted much attention due to its multifunctionality, such as transparent conducting oxide, light-emitting diode, photocatalyst, and so on. To improve performances in the versatile applications, numerous hybrid strategies of ZnO with graphene have been attempted, various synergistic effects achieved ZnO-graphene nanostructures. Here we report extraordinary charge transport behavior Al-doped (AZO)-reduced oxide (RGO) nanocomposites. Although most...
The thermal conductivity of layered metal chalcogenides such as <TEX>$MT_2$</TEX> (M = Mo, W; T S, Se) shows a marked decrease after exfoliation and subsequent restacking process. Random stacking two-dimensional crystalline sheets circumvents conduction pathways along longitudinal direction, which results in reduction conductivity. <TEX>$WS_2$</TEX> <TEX>$WSe_2$</TEX> compounds retain p-type conducting behavior with decreased electrical due to the change carrier concentration....
Herein, we report on a scalable synthesis of Au nanodot (Au-ND)/Bi<sub>2</sub>Te<sub>3</sub> nanotube (BT-NT) nanocomposites by the bottom-up hybrid raw materials and subsequent spark plasma sintering, their thermoelectric properties were systematically compared with those Au-doped Bi<sub>2</sub>Te<sub>3</sub> compounds.
Uranium–organic framework solids, in which uranium building units are connected by bidentate dicarboxylate anions such as succinate, glutarate, and isophthalate, were synthesized; the glutarate isophthalate compounds contain cavities, occluded water organic templates reside.
We believe [(Th2F5)(NC7H5O4)2(H2O)][NO3] is the first three-dimensionally connected, actinide−organic framework solid. The structure composed of thorium oxyfluoride chains, each which connected to pyridinedicarboxylate groups give a 3D cross-linked network with cavities containing nitrate anions.
Macromolecular nanoplatelets of the ferroelectric oxide Bi4Ti3O12 were synthesized by exfoliation reaction for first time. Formation exfoliated was confirmed atomic force microscopy (AFM) and high-resolution transmission electron (HRTEM).
Herein, we report on a scalable synthesis of surfactant-free Bi2Te2.7Se0.3 nanocrystals by chemical exfoliation and subsequent spark plasma sintering to fabricate nanostructured thermoelectric bulk materials. The exfoliated n-type nanoplatelets were shown transform into nanoscroll-type crystals (∼5 nm in diameter, ∼50 length) ultrasonication. performance the was found be recoverable minimizing surface oxides reduction suspensions. Nanostructured materials, composed plate-like grains with...
Abstract The use of the van der Waals (vdW) gap as an ion migration path, similar to cathode materials in lithium‐ion batteries, enables improved migration. If these also possess semiconductor properties, they can simultaneously control electron or hole transport. Such be used memtransistors, which combine memory and characteristics. However, existing rely on defects such grain boundaries paths, resulting high energy barriers switching voltages. Herein, memtransistors are demonstrated using...
New Dion−Jacobson-type layered perovskite oxyfluorides, ASrNb2O6F (A = Li, Na, and Rb), have been prepared by conventional solid-state reaction, their fluorine distribution in an anion sublattice was studied performing 19F MAS NMR spectroscopic analyses lattice energy calculations to probe the evolution of interlayer cationic conductivitiy upon substitution. From these comparative studies, it is found that anions are randomly distributed two distinct crystallographic sites among three...
Four new uranium isonicotinate framework solids were synthesized in the UO2(CH3CO2)·2H2O/HF/isonicotinic acid system under hydrothermal conditions. The isolated isonicotinates span a range of dimensionalities from zero-dimensional UO2(C5H5NCO2)(CH3CO2)2 (1), one-dimensional [UO2F2][C5H5NCO2] (2) and [UO2F3][C5H6NCO2]·0.5H2O (3), two-dimensional [UO2F2]2[C5H5NCO2]·H2O (4). Regions phase stability determined using composition space diagrams, which used to demonstrate dependence product on...
Recently, the demand for 3b/cell NAND flash has been increasing due to a strong market shift from 2b/cell in applications, such as USB disk drives, memory cards, MP3 players and digital still cameras that require cost-effective memory. To further expand market, high write read performances are essential [1]. Moreover, device reliability requirements these applications is challenge continuing scaling sub-30nm pitches increases cell-to-cell interference disturbance. We present 64Gb with 7MB/s...
The substitutional doping approach has been shown to be an effective strategy improve ZT of Bi2Te3-based thermoelectric raw materials. We herein report the Fe-doping effects on electronic and thermal transport properties polycrystalline bulks p-type Bi0.48Sb1.52Te3. After a small amount Bi/Sb-sites, power factor could enhanced due optimization carrier concentration. Additionally, lattice conductivity was reduced by intensified point-defect phonon scattering originating from mass difference...
As a doctoral student at the University of Illinois, I have been studying sociology science technology. One main themes in field is how society and technoscience co-produce each other generating new assemblage among heterogeneous factors forces. In cyberspace increasingly viewed as locus which social life interaction achieve meanings patterns. For past 20 years computer-mediated communication (CMC) researchers tried to understand media characteristics CMC influence users' This line research...