- Advanced MRI Techniques and Applications
- Vascular Procedures and Complications
- Central Venous Catheters and Hemodialysis
- Medical Imaging Techniques and Applications
- Electrohydrodynamics and Fluid Dynamics
- Pediatric Urology and Nephrology Studies
- Cerebrovascular and Carotid Artery Diseases
- Intracranial Aneurysms: Treatment and Complications
- MRI in cancer diagnosis
- Cardiac Imaging and Diagnostics
- Ophthalmology and Eye Disorders
- Radiation Dose and Imaging
- Atomic and Subatomic Physics Research
- Ureteral procedures and complications
- Peripheral Artery Disease Management
- Venous Thromboembolism Diagnosis and Management
- Reproductive Biology and Fertility
- Acute Ischemic Stroke Management
- Advanced Neuroimaging Techniques and Applications
- Abdominal vascular conditions and treatments
- Advanced X-ray and CT Imaging
- Gallbladder and Bile Duct Disorders
- Radiomics and Machine Learning in Medical Imaging
- Kidney Stones and Urolithiasis Treatments
- Renal and Vascular Pathologies
University of Seoul
2025
Changwon National University
2016-2024
Gyeongsang National University
2012-2024
Seoul St. Mary's Hospital
2020-2023
Catholic University of Korea
2020-2023
Weatherford College
2023
Korea University
2009-2022
Severance Hospital
2021
Yonsei University
2007-2021
National University College
2021
As a direct write technology, the electrohydrodynamic printing of silver nanoparticles by using focused nanocolloid jet is introduced. In this letter, two categorized types examples two-dimensional patterning were printed method. A spiral-type inductor was to demonstrate feasibility as fabrication process. The spiral produced 9.45μH and exhibited approximately five times larger resistivity (9.5μΩcm) than that bulk after sintering Then, complex geometries having square- round-shape patterns...
Fabrication of a flexible organic solar cell is demonstrated with an anode that free tin-doped indium oxide (ITO) by electrohydrodynamic (EHD) spraying silver nanowires (Ag NWs). This methodology applicable to fabricate patterned Ag NW thin-film electrodes for cells (OSCs). By optimizing the spray parameters and post-processing conditions, transparent sheet resistances ∼11 Ω sq−1 (on glass) ∼20 polyethylene terephthalate, PET) DC optical conductivities ∼70 can be obtained at transmittance...
The corpus callosum (CC) is the largest white matter structure in brain, consisting of more than 200-250 million axons that provide a large connection mainly between homologous cerebral cortical areas mirror image sites. posterior end CC thickest part, which called splenium. Various diseases including congenital to acquired lesions anomalies, traumatic lesions, ischemic diseases, tumors, metabolic, toxic, degenerative, and demyelinating can involve splenium their clinical symptoms signs are...
We examined the association of breakfast habits with hypertension and obesity risk among Korean adults older adults, focusing on sex-based age-based differences. collected data from 2,779 (1,380 men 1,399 women, aged 19-64 years) 623 (289 334 ≥65 2015 Korea National Physical Fitness Project, an extensive survey organized biennially by Ministry Culture, Sports Tourism Institute Sport Science. For women 19 to 64 yr, skipping was linked increased likelihood developing both high blood pressure...
The objective of our study was to evaluate the quality virtual monoenergetic imaging (VMI) from dual-layer detector spectral CT and effect images obtained at low energies on detection pulmonary embolism (PE) in patients with a suboptimally enhanced artery chest CT.Of 1552 consecutive examinations performed using routine protocol tube voltage 120 kVp, 79 suboptimal enhancement (i.e., mean attenuation ≤ 180 HU) were included. artery, noise, contrast-to-noise ratio (CNR), signal-to-noise (SNR)...
OBJECTIVE. The long scan time of brain MRI is a major drawback that limits its clinical use for evaluating pediatric patients who are inherently prone to motion and frequently require sedatives. This study investigated the feasibility 1-minute ultrafast protocol in by assessing image quality comparison with routine MRI. MATERIALS AND METHODS. Twenty-three were enrolled underwent protocols including five essential sequences (T1-weighted imaging, T2-weighted DWI, FLAIR, T2*-weighted imaging)....
l-Ergothioneine (EGT) is a strong antioxidant used in industry, and it commonly extracted from mushrooms; however, its production limited. As an alternative, we developed metabolically engineered Corynebacterium glutamicum with reinforced sulfur assimilation pentose phosphate pathways, which led to the accumulation of 45.0 63.2 mg/L EGT, respectively. Additionally, overexpression cysEKR resulted further promoted EGT ET4 (66.5 mg/L) ET7 (85.0 mg/L). Based on this result, strain ET11, all...
A number of studies have evaluated the variable courses facial artery. However, results these differed substantially from each other so not consistent relationships yet been established. There has also to be a relevant study using conventional angiography.We assessed variant branching pattern artery and its branches angiography.Two radiologists retrospectively reviewed 284 cases angiographies external carotid in 198 patients. The infraorbital branch maxillary were classified into 4 types 2...
The aim of this study was to estimate the value identifying vesicoureteral reflux (VUR) on a voiding cystourethrogram (VCUG) and benefit VUR management according imaging strategies at first febrile urinary tract infection (UTI).Children aged 1-144 months (n = 618) with UTI admitted our hospital from 2000 2009 were enrolled. In all patients, renal sonogram (US), (99m) Tc-dimercaptosuccinic acid (DMSA) scanning VCUG performed. Retrospective analyses per patient unit performed.Abnormal US or...
Flow visualization in time-of-flight magnetic resonance angiography (TOF MRA) is limited for treated intracranial aneurysms owing to susceptibility and radiofrequency shielding.To assess the clinical usefulness of noncontrast-enhanced (MRA) using a silent scan (silent as follow-up imaging modality patients with aneurysms.A total 119 126 underwent MRA TOF during same session. Two neuroradiologists independently assessed overall image quality site 5-point Likert scale compare 2 sets. We used...
The aim of this study was to determine the relationship between lobar severity emphysema and lung cancer using automated lobe segmentation quantification methods. This included 78 patients (74 males 4 females; mean age 72 years) with following conditions: pathologically proven cancer, available chest computed tomographic (CT) scans for segmentation, quantitative scoring emphysema. analyzed each pulmonary lobe. most common location left upper (LUL) (n = 28), followed by right (RUL) 27), lower...
Most music recommender systems produce a set of recommendation based on user's previous preference. But the information is not always attainable. Focusing fact that listening behavior repetitive action playing one song at time, we predict next item currently selected items even when preference available. We propose simple but effective method for this problem called Session-based Collaborative Filtering (SSCF), and look into different parameters affect accuracy. Our evaluation real-world...
Organic photovoltaic cells with an ordered heterojunction (OHJ) active layer are expected to show increased performance. In the study described here, OHJ were fabricated using a combination of nanoimprinting and electrohydrodynamic (EHD) spray deposition methods. After electron donor material was nanoimprinted PDMS stamp (valley width: 230 nm, period: 590 nm) duplicated from Si nanomold, acceptor deposited onto EHD method. The donor–acceptor interface observed by obtaining cross-sectional...
Fat suppression magnetic resonance imaging (MRI) technique has been used to improve the diagnostic confidence in lumbar spine diseases.We aimed compare T2-weighted water-fat separation (T2 Dixon) with spectral attenuated inversion recovery (SPAIR) image for fat suppression. METHODSLumbar MRI examinations were performed 79 patients by using a 3.0 T machine.We compared T2 Dixon water-only and SPAIR evaluation of quality lesion conspicuity.For qualitative evaluation, two radiologists scored...
<h3>BACKGROUND AND PURPOSE:</h3> The long scan time of MR imaging is a major drawback limiting its clinical use in neuroimaging; therefore, we aimed to investigate the feasibility 1-minute full-brain using multicontrast EPI sequence on different scanner than ones previously reported. <h3>MATERIALS METHODS:</h3> We retrospectively reviewed records 146 patients who underwent sequence, including T1-FLAIR, T2-FLAIR, T2WI, DWI, and T2*WI sequences. Two attending neuroradiologists assessed image...
A set of silver lines with a few hundred nanometers in thickness and micrometers width were obtained using the electrohydrodynamic jet printing. The exhibited about three times higher resistivity (4.8 μΩcm) than that bulk after thermal sintering process. characteristic impedance line was 18 Ω while value calculated 20 Ω. This paper demonstrated possibility printing nanoparticles to obtain conductive onto circuit boards.
Microstructural and chemical properties of screen-printed Ag contacts on an emitter surface in crystalline Si solar cells are investigated using a transmission electron microscope. The Pb-based glass layer, where many precipitates randomly distributed, is formed between thick film textured Si. For both nontextured surfaces, the crystallites epitaxially grown with abrupt interface along {111} atomic plane. Based high resolution microscopy images combined fast Fourier transform patterns,...
Percutaneous transhepatic biliary drainage (PTBD) has been an effective treatment to access the tree, especially in case of endoscopically inaccessible tree. In general, PTBD techniques are divided into two methods: fluoroscopy-guided and ultrasound (US)-guided PTBD. This study aimed evaluate effectiveness US-guided PTBD, focusing on radiation exposure according intrahepatic duct (IHD) dilatation degree, differences between right- left-sided approaches benign malignant stenosis/obstruction....