A5002090611- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Multiferroics and related materials
- Acoustic Wave Resonator Technologies
- Dielectric materials and actuators
- Advanced Chemical Physics Studies
- Diverse Approaches in Healthcare and Education Studies
- Education and Learning Interventions
- Gas Sensing Nanomaterials and Sensors
- Stroke Rehabilitation and Recovery
- Health and Wellbeing Research
- Thin-Film Transistor Technologies
- Electronic and Structural Properties of Oxides
- Magnetic properties of thin films
- Advanced Sensor and Energy Harvesting Materials
- Layered Double Hydroxides Synthesis and Applications
- Crystallography and molecular interactions
- Analytical Chemistry and Sensors
- Silicon and Solar Cell Technologies
- Education, Safety, and Science Studies
- Psychosocial Factors Impacting Youth
- Technology Adoption and User Behaviour
- Metal and Thin Film Mechanics
- Healthcare Education and Workforce Issues
- Semiconductor materials and devices
Korea Advanced Institute of Science and Technology
1986-2025
University of Ulsan
2015-2024
Korea Atomic Energy Research Institute
2004-2022
Samsung (South Korea)
2002-2022
Toyota Motor North America (United States)
2013-2022
Konyang University
2015-2021
Ulsan National Institute of Science and Technology
2015-2021
Jungwon University
2021
Korea University of Science and Technology
2021
Jeju National University
2021
Oxidative decomposition of toxic pollutants (such as acetaldehyde and isopropyl alcohol), water, photocurrent generation can all be achieved with visible light. Nano-islands p-type CaFe2O4 interfacing bulk n-type PbBi2Nb1.9W0.1O9 (shown) form photocatalytic nanodiodes that demonstrate high stability activity for such applications.
Highly donor-doped (110) layered perovskite materials with a generic composition of AmBmO3m+2 (m = 4, 5; A Ca, Sr, La; B Nb, Ti) loaded nickel have been found to be efficient photocatalysts for overall water splitting quantum yields as high 23% under UV irradiation.
Conventional CMOS charge pump circuits have some current mismatching characteristics. The mismatch of the in PLLs generates a phase offset, which increases spurs PLL output signals. In particular, it reduces locking range wide with dual loop scheme. A new circuit perfect matching characteristics is proposed. By using an error amplifier and reference sources, one can achieve good It shows nearly over whole VCO input range, amount spur < –75 dBc signal. implemented 0.25 µm process.
The hydrogenolysis of n-butane was studied on Mo and M02C supported A12O3 as well bulk carbides Mo2C α-MoC1-x. Well-reduced molybdenum clusters Al2O3 were prepared according to the method Burwell co-workers. transformed in CH4H2 mixtures into shown by X-ray absorption spectroscopy. Turnover rates, vt, referred number surface metal atoms titrated irreversible chemisorption CO very high both unsupported catalysts. value vt for slightly less than that Ru Os, most active metals known alkanes....
Dielectric, ferroelectric, piezoelectric, and strain properties of lead-free Sn-doped Bi1/2(Na0.82K0.18)1/2TiO3 (BNKT) were investigated. A crossover from a nonergodic relaxor to an ergodic state at room temperature, accompanied by giant electric-field-induced strain, was observed 5 at. % Sn doping. Switching dynamics monitored during bipolar poling cycle manifested that the originates incipient piezoelectricity. When doping level reached 8 %, BNKT exhibited electrostrictive behavior with...
Recently developed lead‐free incipient piezoceramics are promising candidates for off‐resonance actuator applications with their exceptionally large electromechanical strains. Their commercialization currently faces two major challenges: high electric field required activating the strains and strain hysteresis. It is demonstrated that design of a relaxor/ferroelectric composite provides highly effective way to resolve both challenges. Experimental results in conjunction numerical simulations...
The construction of Pohang Accelerator Laboratory X-ray Free-Electron Laser (PAL-XFEL), a 0.1-nm hard free-electron laser (FEL) facility based on 10-GeV S-band linear accelerator (LINAC), is achieved in Pohang, Korea by the end 2016. 1.11 km-long building was completed 2014, and installation LINAC undulators started January 2015. LINAC, together with beamlines, commissioning began April 2016, first lasing FEL line 14 June progress PAL-XFEL its commission are reported here.
This study examined the extent to which individualism-collectivism moderates relative effects of agency control beliefs (i.e., self-efficacy), social norms subjective norms), and risk perception (perceived vulnerability perceived severity) on behavioral intention engage in self-protection behavior context H1N1 flu pandemic. Using multistage stratified sampling, present sampled people from US (n = 399) Korea 500), two countries that have been found be prototypical individualistic...
Accurate binding energies of the benzene dimer at T and parallel displaced (PD) configurations were determined using single- double-coupled cluster method with perturbative triple correction (CCSD(T)) correlation-consistent basis sets an effective set extrapolation scheme recently devised. The difference between estimated CCSD(T) limit electronic for PD shapes appears to amount more than 0.3 kcal/mol, indicating shape is a stable configuration this in gas phase. This conclusion further...
We demonstrate that an exceptionally large strain can be induced in CaZrO3-modified alkaline-niobates by electric fields. The maximum of our niobate-based ceramics could reach more than 1,000 pm/V, which is a much higher value commercial soft PZT ceramics. Atomic-scale annular bright-field (ABF) and dark-field (ADF) scanning transmission electron microscopy (STEM) directly revealed individual single grains were composed electrically duplex core–shell structure; relaxor-like cores...
A layered gadolinium hydroxychloride (LGdH), [Gd2(OH)5(H2O)x]Cl, was synthesized from an aqueous solution of GdCl3·6H2O. The X-ray diffraction (XRD) and the selected area electron (SAED) studies showed that this compound crystallizes in orthorhombic structure (a = 12.88(4) Å, b 7.30(2) c 8.46(3) Å) which is isostructural with [Eu2(OH)5(H2O)x]Cl. Interestingly, material readily dispersed led to a stable colloidal nanosheet medium. obtained solutions were characterized by evaluation their...
Abstract Using two-wave panel survey data (N = 348) collected in South Korea the context of H1N1 flu, we explored several important aspects optimistic bias that have been relatively unexplored previous research, including: (a) extent to which risk communication and indirect experience affect changes over time; (b) utility concept predict subsequent behavior; (c) how moderates effect on self-protection behavior. The findings revealed is rather enduring resilient, as it changed only under one...