A5100366816- Astrophysical Phenomena and Observations
- Semiconductor materials and devices
- Electromagnetic Compatibility and Noise Suppression
- Pulsars and Gravitational Waves Research
- Advancements in PLL and VCO Technologies
- Digital Holography and Microscopy
- 3D IC and TSV technologies
- Thin-Film Transistor Technologies
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Wireless Communication Techniques
- GaN-based semiconductor devices and materials
- Advanced X-ray Imaging Techniques
- Silicon Carbide Semiconductor Technologies
- Physics of Superconductivity and Magnetism
- Radio Frequency Integrated Circuit Design
- Semiconductor Lasers and Optical Devices
- Magnetic properties of thin films
- CCD and CMOS Imaging Sensors
- Color Science and Applications
- Advanced Image and Video Retrieval Techniques
- Analog and Mixed-Signal Circuit Design
- Plasma Diagnostics and Applications
- Gamma-ray bursts and supernovae
- Electrostatic Discharge in Electronics
- Astrophysics and Cosmic Phenomena
Korea Astronomy and Space Science Institute
2017-2024
Kyungpook National University
2024
Samsung (South Korea)
2012-2023
Sungkyunkwan University
2014-2021
Hanyang University
2002-2020
Myongji Hospital
2020
Microchip Technology (United States)
2020
California Institute of Technology
2016-2019
University of Notre Dame
2015-2018
Pusan National University
2017
We report the implementation of a parallel microscopy system (96 Eyes) that is capable simultaneous imaging all wells on 96-well plate. The optical consists 96 units, where each unit made out four element objective, through molded injection process, and low cost CMOS camera chip. By illuminating sample with angle varying light applying Fourier Ptychography, we can improve effective brightfield numerical aperture objectives from 0.23 to 0.3, extend depth field ±5 μm ±15 μm. use Ptychography...
Herein, the challenge of accurately classifying manufacturing origin printing paper, including continent, country, and specific product, was addressed. One-dimensional convolutional neural network (1D CNN) models trained on infrared (IR) spectrum data acquired from paper samples were used for task. The preprocessing IR spectra through a second-derivative transformation restriction spectral range to 1800 1200 cm-1 improved classification performance model. outcomes highly promising. Models in...
This paper presents a method to simultaneously acquire an aberration-corrected, wide field-of-view fluorescence image and highresolution coherent bright-field using computational microscopy method.First, the procedure applies Fourier ptychographic (FPM) retrieve amplitude phase of sample, at resolution that significantly exceeds cutoff spatial frequency microscope objective lens.At same time, redundancy within set acquired FPM images offers means estimate aberrations.Second, acquires...
Optical scattering has traditionally limited the ability to focus light inside media such as biological tissue. Recently developed wavefront shaping techniques promise overcome this limit by tailoring an optical constructively interfere at a target location deep media. To find solution, "guide-star" mechanism is required identify location. However, developing guidestars of practical usefulness challenging, especially in tissue, which hinders translation techniques. Here, we demonstrate...
Water-insoluble anticancer drugs, including paclitaxel, present severe clinical side effects when administered to patients, primarily associated with the toxicity of reagents used solubilize drugs. In efforts develop alternative formulations water-insoluble drugs suitable for intravenous administration, we developed biocompatible therapeutic solid lipid nanoparticles (SLNs), mimicking structure and composition natural particles, low-density lipoproteins (LDLs), tumor-targeted delivery...
Multi-day tracking of cells in culture systems can provide valuable information bioscience experiments.We report the development a cell imaging system, named EmSight, which incorporates multiple compact Fourier ptychographic microscopes with standard multiwell plate.The system is housed an incubator and presently six microscopes.By using same low magnification objective lenses as tube lens, EmSight configured 1:1 that, providing large field-of-view (FOV) onto low-cost CMOS sensor.The...
Objective and Impact Statement. We propose a rapid accurate blood cell identification method exploiting deep learning label-free refractive index (RI) tomography. Our computational approach that fully utilizes tomographic information of bone marrow (BM) white (WBC) enables us to not only classify the cells with but also quantitatively study their morphological biochemical properties for hematology research. Introduction. Conventional methods examining cells, such as smear analysis by medical...
In this paper, we propose an algorithm to compose a geometrically dewarped and visually enhanced image from two document images taken by digital camera at different angles. Unlike the conventional works that require special equipments or assumptions on contents of books complicated acquisition steps, estimate unfolded book surface corresponding points between images. For purpose, matrices are estimated using structure reconstruction, 3-D projection analysis, random sample consensus-based...
To develop data driver LSIs for over a 1-billion-color TFT-LCD TV with full HD (1920/spl times/1080) format, key issues in the architecture as well circuit design and panel realizing true 1024 gray level images are discussed. We present our recent results of 10-bit scale applied to 42-inch diagonal format. verified that picture shades is much more natural than 8-bit gray.
A 10-bit driver IC for laser projection full high-definition TV (HDTV) applications using a spatial optical modulator (SOM) has been developed. For high-speed data transfer between the timing controller and IC, adopts mini-LVDS interface that operates up to 400 Mbps. To reduce chip area, digital-to-analog converter (DAC) structure including 7-bit resistor-string DAC unity-gain buffer, which 3-bit linear DAC, is proposed. The area of proposed 40% smaller than typical 8-bit DAC. 546 channels,...
Multi-level NAND flash memories with a 38nm design rule have been successfully developed for the first time. A break-through patterning technology of Self Aligned Double Patterning (SADP) together ArF lithography is applied to three critical lithographic steps. Other key integration technologies include low thermal budget ILD process and twisted bit-line contact excellent isolation between adjacent bit lines. Hemi-Cylindrical FET (HCFET) charge trapping memory cell Si/SiO <inf...
We aimed to investigate the effects of meteorological factors and air pollutants on out-of-hospital cardiac arrest (OHCA) according seasonal variations because roles these remain controversial date.A total 38 928 OHCAs origin that occurred within eight metropolitan areas between 2012 2016 were identified from Korean nationwide emergency medical service database. A time series multilevel approach based Poisson analysis following a Granger causality test was used analyse influence pollution 13...
A 10b driver IC for laser projection full HDTV applications uses a 7b resistor-string DAC and unity-gain buffer with 3b DAC. The has 546 output channels, voltage deviation of less than 1mV, 200MHz mini-LVDS interface, maximum settling time 2.4 mus 1080pixel spatial optical modulator 40pF capacitive loads. is fabricated in 0.35 μm CMOS process the chip area 21.7 times3.0 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>
In our prior series of papers, we studied the non-relativistic and relativistic linear stability analysis magnetized jets that do not have current sheets. this paper, extend to with a velocity shear similar sheet free structure. The study are realistic because include shear, magnetic structure, thermal pressure so as achieve overall balance in unperturbed jet. order parametrize apply parabolic profile jets' 4-velocity. We find significantly improves jets. This fact is completely consistent...
We have studied the behavior of superconducting critical temperature ${T}_{c}$ in $\mathrm{Nb}∕{\mathrm{Co}}_{60}{\mathrm{Fe}}_{40}$, $\mathrm{Nb}∕\mathrm{Ni}$, and $\mathrm{Nb}∕{\mathrm{Cu}}_{40}{\mathrm{Ni}}_{60}$ bilayers as a function thickness each ferromagnetic metal layer. The ${T}_{c}$'s three sets exhibit nonmonotonic thickness. Employing quantitative analysis based on Usadel formalism effect exchange energy, we observed that $\mathrm{Nb}∕{\mathrm{Co}}_{60}{\mathrm{Fe}}_{40}$ is...
In our prior papers, we considered the non-relativistic linear stability analysis of magnetized jets that do not have current sheet at boundary. this paper, extend to relativistic jets. order find unstable modes sheet-free, jets, linearize full magnetohydrodynamics equations and solve them numerically. We dispersion relation pinch kink mode instabilities. By comparing relations mildly jet (Lorentz factor 2) with moderately 10), higher Lorentz is significantly more stable in both modes. show...
In this paper we consider stability of magnetized jets that carry no net electric current and do not have sheets (Gourgouliatos et al. 2012). The non-relativistic MHD equations are linearized around the background velocity magnetic field structure jet. resulting linear solved numerically inside We find introduction current-sheet-free significantly improves jet relative to unmagnetized or with at their surface. This particularly applies fundamental pinch kink modes - they become completely...
We study time evolution of sub-Keplerian transonic accretion flows onto black holes using a general relativistic numerical simulation code. perform simulations around the having non-zero rotation. first compare one-dimensional results with theoretical and validate performance our Next, we present axisymmetric, two-dimensional advective flows. In literature, there is no solution which describes steady shock solutions in two dimensions. However, produce these centrifugal force supported waves...
In a prior paper (Kim et al. 2015) we considered the linear stability of magnetized jets that carry no net electric current and do not have sheets. this paper, in addition to physically well-motivated magnetic field structures, also include effects jet shear. The study finite thermal pressure having realistic structures velocity We find shear has strongly stabilizing effect on various modes instability. Increasing stabilizes fundamental pinch at long wavelengths short wavelengths. first...
ABSTRACT In modelling a relativistic disc around compact object, the self-gravity of is often neglected while it needs to be incorporated for more accurate descriptions in several circumstances. Extending Komatsu–Eriguchi–Hachisu self-consistent field method, we present numerical models rapidly rotating neutron star with self-gravitating stationary equilibrium. particular, our approach allows us obtain solutions involving massive rest mass $\mathcal {O}(10^{-1})-\mathcal {O}(10^0)\, \mathrm{...