A5100645550- Medical Imaging Techniques and Applications
- Advanced X-ray and CT Imaging
- Geological and Geophysical Studies
- Advancements in Photolithography Techniques
- Radiation Dose and Imaging
- Advanced Radiotherapy Techniques
- Methane Hydrates and Related Phenomena
- Nanofabrication and Lithography Techniques
- Geophysical and Geoelectrical Methods
- Advanced Surface Polishing Techniques
- Engineering Applied Research
- earthquake and tectonic studies
- Geological Modeling and Analysis
- Optical Coatings and Gratings
- Geomagnetism and Paleomagnetism Studies
- Robotic Locomotion and Control
- Laser Material Processing Techniques
- Geophysics and Gravity Measurements
- Advanced optical system design
- Optical Coherence Tomography Applications
- Photonic Crystals and Applications
- Photonic and Optical Devices
- Robot Manipulation and Learning
- 3D Modeling in Geospatial Applications
- Electron and X-Ray Spectroscopy Techniques
Yonsei University
2022-2024
Korea Institute of Ocean Science and Technology
2010-2023
Korea Advanced Institute of Science and Technology
2015-2020
Busan Institute of Science and Technology
2015-2016
Kyungpook National University
2013-2014
Inha University
2014
Kangwon National University
2012
Kongju National University
2011
Korea Institute of Science and Technology
2006-2008
Ames National Laboratory
2005-2006
During the communication and interaction with a human using motions or gestures, humanoid robot needs to not only look like but also behavior avoid confusions in interaction. Among human-like behaviors, arm of are essential for people through motions. In this work, mathematical representation characterizing is first proposed. The characterized by elbow elevation angle that determined position orientation hands. That mathematically obtained an approximation tool, response surface method...
Abstract This work aims to investigate the clinical feasibility of deep learning-based synthetic CT images for cervix cancer, comparing them MR calculating attenuation (MRCAT). Patient cohort with 50 pairs T2-weighted and from cervical cancer patients was split into 40 training 10 testing phases. We conducted deformable image registration Nyul intensity normalization maximize similarity between as a preprocessing step. The processed were plugged learning model, generative adversarial...
A single-scan dual-energy low-dose cone-beam CT (CBCT) imaging technique that exploits a multi-slit filter is proposed in this paper. The installed between the x-ray source and scanned object reciprocated during scan. beams through slits would generate relatively low-energy projection data, while filtered make high-energy data. An iterative image reconstruction algorithm uses an adaptive-steepest-descent method to minimize total-variation under constraint of data fidelity was applied...
We aimed to investigate the deliverability of dynamic conformal arc therapy (DCAT) by gantry wobble owing intrinsic inter-segment break Elekta linear accelerator (LINAC) and its adverse influence on dose patient. The DCAT was evaluated according plan parameters, which affect rotation speed resultant positional inaccuracies; number control points rates investigated using treatment machine log files dosimetry devices, respectively. A non-negligible degradation in due observed both devices....
Many techniques have been suggested and investigated for the microlens array fabrication in three dimensional structures. We present of a fused silica based mold microlenticular lens using femtosecond laser CO2 laser. The is surface-machined on plate by polished with treatment process can be customized to obtain smooth surface. To evaluate performance fabricated glass mold, we replicated PDMS arrays from micro lenticular mold.
Accurate and efficient scatter correction is essential for acquisition of high-quality x-ray cone-beam CT (CBCT) images various applications. This study was conducted to demonstrate the feasibility using data consistency condition (DCC) as a criterion kernel optimization in deconvolution methods CBCT. As CBCT, mid-plane primarily challenged by scatter, we utilized confirm degree steer update iterative optimization. By means parallel-beam DCC via fan-parallel rebinning, iteratively optimized...
We present an efficient method of fabricating freestanding three-dimensional metallic photonic crystals using soft lithography. Low cost and ease fabrication are achieved through gold sputter deposition on a woodpile polymer template. compare experimental results to theoretical calculations for tetragonal face-centered-tetragonal structures as function the number layers. The behave like full with band edge at wavelength 3.5μm. rejection rates about 10dB/layer.
Seagrass is an essential component of coastal ecosystems because its capability to absorb blue carbon, and involvement in sustaining marine biodiversity. In this study, support vector machine (SVM) technologies with corrected satellite imagery data, were applied identify the distribution seagrasses. Observations seagrasses from obtained using GeoEye-1, Sentinel-2 MSI level 1C, Landsat-8 OLI imagery. The Google Earth has been at a very high resolution, was be used within both training testing...
We proposed a novel measurement method and system to measure the electrical characteristics of non-patterned semiconductor films estimate final device's properties. The is based on measuring bottom-gate structure thin-film transistor (TFT) using probe pins as source drain electrodes. carefully designed array material pin effectively detect extremely low-level currents without patterned electrodes film. contact pressure was also controlled through continuous monitoring an implemented sensor...
We studied the first-order diffracted moiré fringes of transparent multilayered structures comprised irregularly deformed periodic patterns. By a comparison study fringe pattern and detailed microscopy structure, we show that can be used as nondestructive tool to analyze alignment structures. demonstrate method for case layer-by-layer microstructures using soft lithography. The yields high contrast even when materials being aligned have very weak contrasts. imaging is versatile visual...
To reduce the radiation dose given to patients, a tube current modulation (TCM) method has been widely used in diagnostic CT systems. However, TCM not yet applied kV-CBCT system on LINAC machine. The purpose of this study is investigate if would be desirable for image-guided therapy (IGRT) or not. We have developed an attenuation–based using prior knowledge from planning images patients. can provide optimized reductions without degrading image quality imaging. Here, we whether our suggested...
Volcano #1 is a large submarine stratovolcano with summit caldera in the south central part of Tonga Arc. We collected and analyzed multichannel seismic profiles conjunction magnetic data from to investigate structure intracaldera fill processes formation. The fill, exhibiting stratified units maximum thickness 2 km, consists at least four thick wedge landslide debris derived wall. structural floor, deepening toward northwestern rim, suggests asymmetric collapse initial stage, which, turn,...
Abstract Purpose As computed tomography ( CT ) imaging is the most commonly used modality for treatment planning in radiation therapy, metal artifacts images may complicate target delineation and reduce dose calculation accuracy. Although current scanners do provide certain correction steps, it a common understanding that there not universal solution yet to artifact reduction MAR general. Particularly noting importance of planning, we propose novel method this work recruits an additional...
The variation of the particle size distribution and density as well chemical composition aerosols is important to evaluate particles. This study measured analyzed airborne particles using a scanning mobility sizer (SMPS) system an aerodynamic (APS) at University Seoul during every season. highest number concentration less than <TEX>$0.9\;{\mu}m$</TEX>, occurred in winter, while more spring. Mass appeared Also, when we compared <TEX>$\beta$</TEX>-ray's mass with calculated by SMPS-APS each...
Recent developments in remote sensing research have resulted a large amount of variability the data provided by researchers. Synthetic aperture radar (SAR) is tool used to measure surface deformation and assess changes Earth’s surface. Here, we consider usefulness Interferometric Aperture Radar (InSAR) assessing past volcanic activity as key learning characteristics around volcano. The Hantangang River field (HRVF) geoheritage site Korean Peninsula that has interesting geological...
글리세라이드의 지방산 사슬길이 및 구조적 차이에 따른 영향을 평가하기 위하여 팜오일에서 추출된 글리세롤과 palmitic acid, stearic acid등 사슬길이가 <TEX>$C_{12}{\sim}C_{18}$</TEX>인 지방산을 이용하여, mono, di, tri등 다양한 글리세라이드 구조를 가진 신규 분산제를 합성하였고, 이를 실리카 충진배합물에 적용하여 기존의 금속염 분산제와 비교평가 하였다. 실험결과, 분산제는 분산제 대비 혼합고무 내 윤활효과가 낮아서 혼합고무의 점도는 높으나, 분산이 크게 향상됨을 확인하였다. 이는 기계적 물성과 마모성능, Payne effect로 확인되었다. 또한 길수록, 글리세롤에 중합된 수가 적을수록(tri- < di-< mono-glyceride)혼합고무 분산특성은 향상되었다. To study the effects of structural difference and fatty acid chain length glyceride, new...
We present a methodology for the optimization of sampling schemes in diffuse optical tomography (DOT). The proposed method exploits singular value decomposition (SVD) sensitivity matrix, or weight DOT. Two mathematical metrics are introduced to assess and determine optimum source–detector measurement configuration terms data correlation image space resolution. key idea work is each measurement, rows similarly unknown basis, columns according their contribution rank respectively. offer...