A5102960597- Microwave Dielectric Ceramics Synthesis
- Ferroelectric and Piezoelectric Materials
- Advanced ceramic materials synthesis
- Layered Double Hydroxides Synthesis and Applications
- Multiferroics and related materials
- Acoustic Wave Resonator Technologies
- Dielectric materials and actuators
- Photonic and Optical Devices
- Dielectric properties of ceramics
- Advanced Fiber Optic Sensors
- Semiconductor materials and devices
- Semiconductor Lasers and Optical Devices
- Glass properties and applications
- Polymer Nanocomposites and Properties
- EEG and Brain-Computer Interfaces
- Nuclear materials and radiation effects
- Microwave-Assisted Synthesis and Applications
- Microwave Engineering and Waveguides
- IoT-based Smart Home Systems
- Infrastructure Maintenance and Monitoring
- Copper Interconnects and Reliability
- Electromagnetic wave absorption materials
- Wave and Wind Energy Systems
- Coastal and Marine Dynamics
- Seismic Performance and Analysis
Inha University
2005-2025
Agency for Defense Development
2024
Kyonggi University
2014-2023
Busan University of Foreign Studies
2003-2023
Pohang Iron and Steel (South Korea)
2018-2023
Government of the Republic of Korea
2017
The University of Texas at Austin
2012-2016
Aixtron (Germany)
2016
Suwon Research Institute
2016
Pukyong National University
2015
Microwave dielectric properties and far infrared reflectivity spectra were investigated in the (Zr 0.8 Sn 0.2 )TiO 4 ceramics with 1 mol% Sb 2 O 5 , 3 Nd respectively. Dielectric constant was not significantly changed, while unloaded Q value affected additives. The of pure specimens higher than that and/or but lower . high 6600 at 7 GHz obtained for due to elimination oxygen vacancies. effects additives on intrinsic microwave losses by from 50 4000 cm -1 which evaluated using Kramers-Kronig...
The dependence of microwave dielectric properties on the crystal structure, bond character, and electronic characteristics AMoO 4 AWO ( A = Ni , Mg Zn ) ceramics was investigated. constant K specimens principally affected by polarizabilities, molar volume, oxide polarizabilities. MgMoO display a single phase monoclinic wolframite whereas ZnMoO is triclinic structure. quality factor Qf higher than that ); these results were attributed to packing fraction due effective ionic size. temperature...
A series of ultra-low loss microwave dielectric materials Li<sub>2</sub>O–MgO–BO<sub>2</sub>(B = Ti, Sn, Zr) were prepared by the conventional solid-state method.
Microwave dielectric properties of Ca 1‐ x Sm 2 /3 TiO 3 ceramics were investigated as a function the amount 3+ substitution (0.0 ≤ 0.8). The structure was changed from orthorhombic perovskite at = 0.0 to tetragonal 0.6. As calcium vacancy concentration increased with substitution, unloaded Q value (similar/congruent 1/tan delta) up solid‐solution limit 0.6 and then decreased because formation secondary phase Ti O 7 . constant substitution. effects on loss specimens analyzed by infrared...
The temperature coefficient of the resonant frequency (TCF) complex perovskite (Pb 1− x Ca )[Fe 0.5 (Nb y Ta ) ]O 3 ceramics ( = 0.5, 0.55; 0.0 ≤ 1.0) was investigated, relative to bond valence A‐ and B‐site ions in ABO structure (such as barium‐, strontium‐, calcium‐based perovskites). TCF these compounds varied with B‐sites tolerance factor t structure. In tilted region < 1.0), tilting oxygen octahedra increased decreased, because B‐site. Also, dependence on A‐site similar its .
Abstract Building period formulas in seismic design code are evaluated with over 800 apparent building periods from 191 stations and 67 earthquake events. The evaluation is carried out the ASCE 7‐05 for steel RC moment‐resisting frames, shear wall buildings, braced other structural types. Qualitative comparison of measured calculated shows that formula frames generally predicts well lower bound all heights. But differences between low‐ to‐medium rise buildings relatively high. In addition,...
Abstract Nucleoside deoxyribosyl transferase (NDT) is an enzyme that catalyzes the transfer of purine and pyrimidine bases between 2'-deoxyribonucleosides widely used for synthesizing nucleoside analogs in various biotechnological applications. While NDT exhibits high activity toward natural nucleosides, its unnatural significantly lower. Previously, mutant named fNDT(L59Q) was identified displaying 4.4-fold higher 2'-fluoro-2'-deoxyuridine (2FDU). In this study, molecular evolution...
A temperature sensor based on evanescent field coupling between a single-mode side-polished fiber and polymer planar waveguide was demonstrated. Due to thermooptic effects of waveguide, the resonance wavelength device is very sensitive ambient temperature. Two kinds polymers were used as materials. Fabricated sensors have sensitivity -0.37 nm//spl deg/C -0.71 deg/C, respectively. We also measured coefficient employed approximately.
Some Artemisia herbs are used for medicinal purposes. In particular, A. princeps and argyi classified as 'Aeyup' important material in traditional Korean medicine. On the other hand, capillaris iwayomogi, which 'Injinho' 'Haninjin', respectively, purposes distinct from those of 'Aeyup'. However, sometimes is not clearly discriminated and/or 'Haninjin'. Furthermore, iwayomogi have been place argyi. this study, we developed an efficient method to discriminate plants. The RAPD (random amplified...
Abstract Plasmonic effects that enhance electric fields and amplify optical signals are crucial for improving the resolution of imaging systems. In this paper, a metal-based plasmonic nanostructure (MPN) is designed to increase an system by amplifying specific signal while producing effect via dipole nanoantenna (DN) grating (GN), which couple field be focused at center unit cell. We confirmed MPN enhances 15 times more than DN GN, enabling acquisition finely resolved signals. The...