A5100416700- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Optical Wireless Communication Technologies
- Advanced machining processes and optimization
- Advanced Machining and Optimization Techniques
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Surface Polishing Techniques
- Advanced MEMS and NEMS Technologies
- Semiconductor materials and devices
- bioluminescence and chemiluminescence research
- Radio Wave Propagation Studies
- Enzyme Structure and Function
- CCD and CMOS Imaging Sensors
- Image Processing Techniques and Applications
- Semiconductor Quantum Structures and Devices
- Advanced Sensor Technologies Research
- Optical Network Technologies
- Analog and Mixed-Signal Circuit Design
- Advanced MRI Techniques and Applications
- Crystallization and Solubility Studies
- Advancements in Photolithography Techniques
- GaN-based semiconductor devices and materials
- Electron and X-Ray Spectroscopy Techniques
- Optical and Acousto-Optic Technologies
Korea University
2012-2025
Wonkwang University
2024
Gwangju Institute of Science and Technology
2006-2021
Dongshin University
2021
Korea University Medical Center
2021
Center for Art Studies
2018
Sogang University
2004-2015
Korea Advanced Nano Fab Center
2012
Dongbu HiTek (South Korea)
2009-2011
Seoul National University Bundang Hospital
2011
Abstract Objective: To investigate anatomical changes in the substantia nigra (SN) of Parkinson disease (PD) patients with age‐matched controls by using ultra‐high field magnetic resonance imaging (MRI). Methods: We performed 7T MRI 10 PD and control subjects. Magnetic images SN were obtained from a 3‐dimensional (3D) T 2 *‐weighted gradient echo sequence. Region interest‐based 3D shape analysis was to quantitatively compare groups. Results: The boundary between crus cerebri not smooth...
Dabigatran etexilate (DABE), a prodrug of dabigatran (DAB), is direct thrombin inhibitor used to prevent ischemic stroke and thromboembolism during atrial fibrillation. The effect genetic polymorphisms on its metabolism, particularly UGT2B15, has not been extensively explored in humans. This study aimed investigate the effects ABCB1, CES1 pharmacokinetics DAB acylglucuronide metabolites healthy subjects. A total 124 males were genotyped for polymorphisms. After single 150 mg dose DABE,...
We investigated the characteristics of InGaN-based multiple quantum wells (MQWs) grown on a-plane and c-plane GaN templates, which were by metal-organic chemical vapor deposition onto r-plane sapphire, respectively. A shorter photoluminescence peak wavelength peaks with larger full-width at half-maximum are observed for MQWs an template compared a template, despite same growth conditions used. model based atomic configuration growing surfaces is proposed to explain difference in optical...
Polycyclic aromatic hydrocarbons (PAHs) have a highly recalcitrant structure; however, they can be degraded by white-rot fungi which the potential to biodegrade organic compounds. Four fungal isolates were selected from 23 newly isolated basidiomycetes, based on their dye decolorization rate, and evaluated for ability degrade 50 ppm of pyrene. The isolate phylogenetically affiliated Merulius tremellosus KUC9161 demonstrated highest degradation rate pyrene, regardless production ligninolytic...
Abstract Time-resolved serial femtosecond crystallography with X-ray free electron laser (XFEL) holds the potential to view fast reactions occurring at near-physiological temperature. However, production and characterization of homogeneous micron-sized protein crystals high density remain a bottleneck, due lack necessary equipments in ordinary laboratories. We describe here supersaturation-controlled microcrystallization visualization analysis tools that can be easily used any laboratory....
In this demonstration, we design the integration of WLAN-based RF transmission and multi-wavelength FSO transmission, achieving 20Gbps. Two wavelength beams 1549.322nm 1550.124nm are modulated used for MQAM OFDM signal by USRP 10Gbps OOK BERT. It is shown that when received optical power greater than –13dBm beams, WDM-FSO system achieves BER requirements WLAN. Furthermore, signal, error-free condition below 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The laser TV using blue, green diode-pumped solid state lasers and a red diode is developed. wavelengths of the are 457 nm, 532 nm 648 output powers 350 mW, 700 mW 500 respectively. power levels adjusted for white color balance. polygon mirror galvanometer used horizontal scanning vertical scanning, image size 80 inches with high-brightness VGA resolution (640 X 480 Progressive scanning) obtained. acousto-optic modulator (AOM) fabricated beam modulation, which carrier frequency MHz XGA...
The Electric discharge machining (EDM) process is used to minimize the difference between designed feature and machined while most workpiece removed through cutting processes. tiny-deep hole perpendicular wall in mold die are good applications of EDM. Among EDM equipment, super drill uses hollowed electrode eliminate debris which causes second with degrades quality. Through hollow, high pressured oil supplied remove together spindle rotation. thin-hollow tends easily wear out compared sold...
ArF exposure tool have been implementing as a main work force of lithography. And haze generation by high actinic wavelength energy is big issue to be resolved. Many studies reported remove or minimized ion residual on photomask surface and PKL developed free process. Even though the from ions generating defect process, but environment like pellicle packing box make worsen keep cleanness photomask. The evaluation effect outgas reported, it was hard know pure environmental because not enough...
Free-space wireless optical communication (FSO), which adopts the wavelength division multiplexing (WDM) technology, transmits and receives various data combinations on a single channel. The mixed wavelengths are separated by WDM demodulation using different refraction of light. Due to chromatic dispersion, phase arriving signal would depend wavelength. Therefore, clock recovery (CDR) is required determine optimum sampling point in FSO-WDM systems. proposed baud-rate CDR uses an integrator...
For the first time to our knowledge, we have shown that subthreshold hump and reverse narrow channel effect characteristics depend on gate length, strength has a peak point at length where threshold voltage is highest. In order explain these effects, proposed new model in which boron transient enhanced diffusion trench isolation edge more suppressed than middle channel. The simulation results using agreed well with experimental results.
A proton-frequency-transparent (PFT) birdcage RF coil that contains carbon-proton switching circuits (CPSCs) is presented to acquire 13C MR signals, which, in turn, enable 1H imaging with existing coils without being affected by a transparent coil. CPSCs were installed the PFT cut during imaging. Finite-difference time-domain (FDTD) electromagnetic (EM) simulations performed verify performance of proposed CPSCs. The was verified via phantom and vivo studies. In studies, images spectra...
The present study aimed to develop a reliable pyrosequencing method detect four single nucleotide polymorphisms (SNPs) of the flavin‑containing monooxygenase 3 (FMO3) gene and compare ethnic differences in their allelic frequencies. was used FMO3 SNPs, namely, c.855C>T (N285N, rs909530), c.441C>T (S147S, rs1800822), c.923A>G (E308G, rs2266780) c.472G>A (E158K, rs2266782). frequencies these SNPs 122 unrelated Korean subjects were as follows: i) 44.7% for c.855C>T; ii) 23.4% c.441C>T; iii)...
For analog applications, the Metal-Insulator-Metal (MIM) capacitance has to be measured at a much higher resolution than using conventional methods, i.e. sub-femto level. A new robust mismatch measurement technique is proposed, which more accurate and compared Floating Gate Capacitance Measurement (FGCM) methods. mismatching methodology based on Vs stable that Vf because influence of pre-existing charge in floating-gate can cancelled slope ΔVs/ΔVf Vs. The accuracy this method evaluated...
The transient photocurrent response of biodevice consisting chlorophyll a Langmuir-Blodgett film was investigated. Chlorophyll LB films were deposited onto the ITO coated glass. To confirm formation, surface analysis done by measurement scanning tunneling microscopy. Metal/insulator/metal structured constructed depositing aluminum surface. investigate photoelectric response, action spectrum measured at various wavelengths. characteristic wavelengths xenon lamp irradiation. Finally,...