A5102902483- Geophysical Methods and Applications
- Microwave Imaging and Scattering Analysis
- Advanced SAR Imaging Techniques
- Numerical methods in inverse problems
- Breast Lesions and Carcinomas
- Breast Cancer Treatment Studies
- MRI in cancer diagnosis
- Seismic Imaging and Inversion Techniques
- Phase-change materials and chalcogenides
- Metamaterials and Metasurfaces Applications
- Electrical and Bioimpedance Tomography
- Lipoproteins and Cardiovascular Health
- Diabetes Treatment and Management
- Pancreatic function and diabetes
- Cancer Diagnosis and Treatment
- Reconstructive Surgery and Microvascular Techniques
- Electric Vehicles and Infrastructure
- Diabetes and associated disorders
- Optical and Acousto-Optic Technologies
- Breast Implant and Reconstruction
- Cancer and Skin Lesions
- Medical Imaging Techniques and Applications
- Vehicle emissions and performance
- Ear and Head Tumors
- Radiopharmaceutical Chemistry and Applications
University of Ulsan
2006-2024
Asan Medical Center
2006-2024
Ulsan College
2006-2019
Pennsylvania State University
2011-2016
National Institute of Food and Drug Safety Evaluation
2014
A reconfigurable metasurface made of Ge2Sb2Te5 phase-change material was experimentally demonstrated in the 1.55 μm wavelength range. nanostructured film on fused silica substrate optimized to switch from highly transmissive (80%) absorptive (76%) modes with a 7:1 contrast ratio transmission independent polarization, when thermally transformed amorphous crystalline state. The designed using genetic algorithm optimizer linked an efficient full-wave electromagnetic solver.
This paper discusses the use of chalcogenide phase change materials to create tunable metamaterials as potential candidates for application adaptive coded aperture control in infrared. Phase exhibit large and reversible changes optical properties (Δn, Δk) when switched between amorphous crystalline phases. Thermally-induced transitions from insulating conductive state can be controlled through external means, facilitating design reconfigurable metamaterial devices that operate with ultrafast...
Nonmass lesions (NMLs) on breast ultrasound lack clear definition and encompass a broad range of benign malignant entities. Given anticipated inclusion NMLs in the BI-RADS 6th edition, thorough understanding these will be critical for optimal management.
Ultrawideband (UWB) waveforms achieve excellent spatial resolution for better characterization of targets in tomographic imaging applications compared to narrowband waveforms. In this paper, two-dimensional images multiple scattering objects are successfully obtained using the diffraction tomography approach by transmitting independent and identically distributed (iid) UWB random noise The feasibility a waveform is investigated formulating white Gaussian (WGN) model spectral estimation....
The paper introduces the principles, simulation results, and hardware implementation of ultrawideband (UWB) noise radar for obtaining tomographic images various scenarios rotating cylindrical objects using independent identically distributed UWB waveforms. A was designed to transmit multiple random waveforms over 3–5 GHz frequency range measure backward scattering data validation theoretical analysis numerical results. reconstructed based on experimental results are seen be in good agreement...
In this paper, we show that a single transmission of random noise waveform may not sufficient to obtain successful tomographic image an object. order overcome shortcoming, multiple independent and identically distributed (iid) waveforms over frequency range from 8 10 GHz are transmitted reconstruct the final various objects. Diffraction tomography theorem is applied for each so objects reconstructed based on backward scattered field at end realization. After all iid transmitted, target by...
The tomographic image of a single cylindrical PEC object is obtained using diffraction tomography theorem after multiple transmissions independent and identically distributed (iid) UWB random noise waveforms. final the cylinder successfully achieved by averaging all images from transmissions. For each transmission, iid band-limited white Gaussian waveform over frequency range 8-10 GHz transmitted. Several numerical simulations in spatial domain are performed, generated based on backward...
This paper investigates the feasibility of using a noise waveform in an ultra-wideband (UWB) radar system for two-dimensional tomographic imaging stationary object with multistatic geometry. Multiple UWB transmitters and receivers are positioned along each side area. We perform several numerical simulations time-domain, successful target is achieved by visual inspection formed images.
Secondary breast malignancy is a rare occurrence, accounting for less than 2% of all malignancies. Salivary duct carcinoma (SDC) metastasizing to the has not been reported previously. This report presents case woman who was initially diagnosed with and treated parotid carcinoma. Two years later, during follow-up visit, lump discovered, which as primary cancer managed surgically. After surgery, hematoxylin eosin immunohistochemical staining revealed that tumor had same features her SDC. Here,...
Abstract The past Single Sustain Driving System had critical problems on both the V S (Sustain Voltage) and A (Address margins. novel method to overcome these deficiencies has been performed by separating ground reference of Y_SUS (Scan) Z_SUS (Common) boards from that Control Address boards, which results in a driving system is achieved designing it as single board. This referred an FSS (Floating Sustain). improved margin dramatically simplified PDP configuration when compared conventional system.
Two-dimensional cross-section images of various cylindrical shapes metallic targets are obtained based on the theory diffraction tomography. Specifically, multiple iid ultra-wideband random noise waveforms transmitted, and tomographic PEC with sharp edges angles reconstructed backward scattering data each transmitted over a frequency range from 8GHz to 10GHz. The image quality is measured by calculating cumulative mean squared error between corresponding pixels reference images.
A hardware system has been developed to perform ultrawideband (UWB) noise radar tomography over the 3–5 GHz frequency range. The utilizes RF transmit multiple independent and identically distributed UWB random waveforms. band-limited signal is generated using an arbitrary waveform generator then amplified transmitted through a horn antenna. linear scanner with single antenna used in place of array collect backscatter. backscatter collected from transmission each reconstructed form image....
In this paper, the principle, simulation, and experiment results of tomographic imaging a cylindrical conducting object using random noise waveforms are presented. Theoretical analysis scattering image reconstruction technique developed based on physical optics approximation Fourier diffraction tomography, respectively. The bistatic radar system is designed to transmit band-limited ultra-wideband (UWB) at fixed position, linear scanner allows single receiving antenna move along horizontal...