Sang Kwon Lee

Sang Kwon Lee
Inha University · Department of Mechanical Engineering

Ph D

About

833
Publications
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15,287
Citations

Publications

Publications (833)
Article
Pulmonary hypertension (PH) is an important predictor of poor outcomes in dogs with mitral regurgitation (MR). The feasibility of radiography to predict PH in dogs with MR is unknown. This retrospective, observational, and analytic study aimed to identify a radiographic parameter to predict PH in dogs with MR. A total of 302 dogs diagnosed with MR...
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Adrenal disease is a common problem in dogs and MRI is increasingly being used as an adjunctive diagnostic test. To date, the MRI features of normal canine adrenal glands have only been reported using 1.5‐Tesla (T) MRI. The aims of this prospective, methods‐comparison, exploratory study were to evaluate the effects of pulse sequence on the appearan...
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Background Postoperative abdominal fluid collections (PAFCs) are a potentially fatal complication of pancreatobiliary surgery. Endoscopic ultrasound (EUS)-guided drainage has recently been shown to be effective in treating PAFCs of more than 4 weeks old. Little is currently known, however, regarding the EUS-guided drainage of PAFCs of less than 4 w...
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OBJECTIVE To assess the usefulness of magnetic resonance urography (MRU) for the visualization of nondilated renal pelvises and ureters in dogs and to compare our findings for MRU versus CT urography (CTU). ANIMALS 9 healthy Beagles. PROCEDURES Dogs underwent CTU, static-fluid MRU, and excretory MRU, with ≥ 7 days between procedures. Contrast med...
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Objective: To assess the feasibility of blood oxygen level-dependent (BOLD) MRI for measurement of the renal T2* relaxation rate (R2*; proxy for renal oxygenation) before and after furosemide administration and to evaluate the reliability and repeatability of those measurements in healthy dogs. Animals: 8 healthy adult Beagles (4 males and 4 fem...
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Objective: To investigate radiographic variables for correlation with splenic size as estimated with CT in cats. Animals: 38 healthy adult cats. Procedures: The width and height of the splenic head and total length, segmental length, and width of the spleen were measured on radiographic and CT images obtained from 10 cats in prospective, explo...
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Diffusion-weighted imaging (DWI) magnetic resonance imaging can evaluate alterations in the microstructure of the kidney. The purpose of this study was to assess the apparent diffusion coefficient (ADC) and the intravoxel incoherent motion model (IVIM) parameters of a normal kidney in healthy dogs, to evaluate the effect of b-value combinations on...
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Despite development in endoscopic treatment and minimally invasive surgery for choledocholithiasis, there remains a small number of patients who require bypass Roux-en-Y choledochojejunostomy (RYCJ) because of the intractable occurrence of common bile duct (CBD) stones. We herein present the detailed procedures of open RYCJ customized for intractab...
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IntroductionFor unresectable hilar obstruction, restoring and maintaining biliary ductal patency are crucial for improved survival and quality of life. The endoscopic placement of stents is now a mainstay of its treatment, and bilateral stenting is effective for biliary decompression. This study aimed to determine the clinical outcomes of bilateral...
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The spin Seebeck effect (SSE) has attracted renewed interest as a promising phenomenon for energy harvesting systems. A noteworthy effort has been devoted to improving the SSE voltage by inserting ultrathin magnetic layers including Fe70Cu30 interlayers in Pt/Y3Fe5O12 (Pt/YIG) systems with increased spin-mixing conductance at the interfaces. Nevert...
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Background: Endoscopic ultrasound (EUS)-guided fine-needle aspiration (FNA) and fine-needle biopsy (FNB) are the current standard of care for sampling pancreatic and peripancreatic masses. Recently, a 22G EUS-FNB needle with Franseen geometry was developed, and this device was also introduced in a 25G platform. We compared the performance of the 2...
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In this research, alternative deposition process of ZnO-based thin films have been studied for transparent conducting oxide (TCO) application. To improve the electrical and optical properties of transparent oxide thin films, alternatively stacked Al-doped ZnO and In-doped ZnO thin films were investigated. Multilayer structure of alternative 6 layer...
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Background. Radiofrequency ablation (RFA) is a palliative method known for its application in the endoscopic treatment of malignant bile duct obstruction. It may be a useful rescue method for metal stent malfunction caused by tumor ingrowth. This study aimed to examine the feasibility and safety of endoluminal RFA for occluded bilateral hilar metal...
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Background and objectives: Rapid on-site cytologic evaluation (ROSE) increases the diagnostic yield of EUS-FNA. However, ROSE requires the presence of a cytopathologist and additional cost and time for slide staining and interpretation. Macroscopic on-site examination (MOSE) was recently introduced as an alternative to ROSE and showed high accurac...
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Background and study aims While recent evidences support endoscopic resection as curative in ampullary tumors with high‐grade intraepithelial neoplasia, only small case series have reported endoscopic management of early‐stage ampullary cancer; thus, radical surgery remains the only accepted treatment modality. We evaluated the long‐term outcomes o...
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We report on direct comparison of out-of-plane thermoelectric properties, such as Seebeck coefficient and electrical conductivity, of the atomically thin MoS 2 films. The films were prepared by a chemical vapor...
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We first observed the spin-to-charge conversion due to both the inverse Rashba-Edelstein effect (IREE) and inverse spin-Hall effect in a holey multilayer molybdenum disulfide (MoS2) intermediate layer in a Pt/YIG structure via LSSE measurements under nonequilibrium magnetization. We found an enhancement of approximately 238%, 307%, and 290% in the...
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Purpose: This study evaluated the efficacy of adjuvant chemotherapy in patients with resected ampulla of Vater (AoV) carcinoma. Patients and methods: Data from 646 patients who underwent surgical resection at Asan Medical Center between 2000 and 2017 were retrospectively reviewed. Results: The median age of the patients was 62 years, and 54.2%...
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Background Endoscopic ultrasound-guided radiofrequency ablation (EUS-RFA) has been increasingly used for the management of various solid pancreatic tumors. This study aimed to evaluate the feasibility and safety of EUS-RFA for serous cystic neoplasms (SCNs). Methods 13 patients with microcystic SCNs with honeycomb appearance underwent EUS-RFA using...
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Computed tomography (CT) perfusion can analyze tissue perfusion and quantitative parameters, including blood flow, blood volume, and transit time. CT perfusion has been used for evaluating split renal function. However, its applicability in veterinary medicine was not validated. This study aimed to evaluate the correlation of renal blood flow (RBF)...
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Background: Atrial tachyarrhythmias (ATAs) are common within the three-month blanking period following catheter ablation of atrial fibrillation (AF). However, little evidence is available regarding the current guidelines on the blanking period after surgical AF ablation. We investigate the incidence and significance of early recurrence of atrial t...
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Background: Despite the scarcity of data based on randomized trials, FOLFIRINOX is widely used in the management of borderline resectable pancreatic cancer (BRPC) and locally advanced unresectable pancreatic cancer (LAPC). We investigated the clinical outcomes of neoadjuvant FOLFIRINOX in patients with BRPC and LAPC. Methods: This single-center...
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Background: Pancreatic surgery may result in changes in pancreatic volume and endocrine function. The effects of pancreatic resection for benign neoplasms on pancreatic volume and endocrine function have not been established yet. This study aimed to investigate the long-term results of different pancreatic surgeries for benign pancreatic neoplasms...
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In article number 2003192, Sang‐Kwon Lee and co‐workers show that the insertion of monolayer WSe2 between the Pt and yttrium iron (YIG) garnet layers significantly enhances the thermopower, VLSSE/ΔT by a factor of approximately 5.6 compared with that of the Pt/YIG reference sample. This enhancement can be explained by the increased spin‐to‐charge c...
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Shear wave elastography (SWE) induces lateral shear wave through acoustic pulses of the transducer and evaluates tissue stiffness quantitatively. This study was performed to evaluate feasibility and reproducibility of two-dimensional shear wave elastography (2D SWE) for evaluation of tissue stiffness and to examine technical factors that affect she...
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Background: Computed tomography urography (CTU), based on the excretion of contrast medium after its injection, allows visualization of the renal parenchyma and the renal collecting system. Objectives: To determine the optimal contrast medium dose allocation ratio to apply in split-bolus CTU in dogs. Methods: This prospective, experimental, ex...
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Transition metal dichalcogenides (TMDs) are layered two-dimensional (2D) semiconductors and have received significant attention for their potential application in field effect transistors (FETs), owing to their inherent characteristics. Among the various reported 2D TMD materials, monolayer (ML) molybdenum disulfide (MoS 2 ) is being considered as...
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Patients with borderline resectable pancreatic cancer (BRPC) have poor prognosis with upfront surgery. This was a single-arm Phase 2 trial for clinical and biomarker analysis. The primary endpoint is 1-year progression-free survival (PFS) rate. Patients received 8 cycles of neoadjuvant modified (m) FOLFIRINOX. Up to 6 cycles of gemcitabine were giv...
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Ga 2 O 3 / n -type 4H-SiC heterojunction diodes were fabricated by depositing Ga 2 O 3 thin films on off-axis cut n type 4H-SiC substrates by RF magnetron sputtering. The influence of oxygen atmosphere annealing on the film quality and optical properties of Ga 2 O 3 layers is investigated. The I – V characteristics of the diodes are acquired in the...
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Nanoscale superlattice thin films generally exhibit larger phonon and electron scattering at the interface in the direction of the cross-plane of the samples. Therefore, it is very important to further detailed study of especially phonon transport of the superlattice films. Here, we report temperature dependent thermal conductivity anisotropy in ph...
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In this research, substitution effects of BiAlO 3 with (Bi, Na)TiO 3 piezoelectric ceramics was investigated for the sensors and actuators applications. (Bi,Na)TiO 3 material has been employed for the piezoelectric devices applications because of their high piezoelectric charge constant, d 33 , of 88 pC/N, electromechanical coupling coefficient, k...
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Background Single-operator cholangioscopy (SOC) provides an accurate diagnosis of indeterminate pancreaticobiliary strictures. However, the procedure is expensive and can be performed using only limited accessories. Therefore, we devised a novel tube-assisted biopsy (TAB) technique and evaluated its feasibility, diagnostic yield, and safety for ind...
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Radiography is a standard diagnostic test for characterizing left heart enlargement in dogs however limited information is available on the effects of respiratory phases. This prospective and retrospective method comparison study investigated the respiratory effect on the size and shape of the left heart in dogs to determine the usefulness of expir...
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Background/aims: Interventional endoscopists may utilize contrast-enhanced harmonic endoscopic ultrasound (CEHEUS) for image guidance during radiofrequency ablation (RFA) because of its capability to delineate real-time tumor perfusion dynamics. The purpose of this study was to assess the utility of CEH-EUS for the guidance and monitoring of endos...
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Objectives: Histopathologic characteristics of choledochal cysts and their clinical implications have not been previously comprehensively studied. Methods: Smooth muscle distribution patterns and other histologic findings (inflammation, metaplasia, dysplasia, and heterotopia) in 233 surgically resected choledochal cysts were evaluated. Results:...
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Objective: To investigate the diagnostic usefulness of split-bolus CT enterography in dogs. Animals: 6 healthy Beagles. Procedures: CT enterography was performed in all dogs in a nonrandomized crossover study design involving 3 techniques: a dual-phase technique and 2 techniques involving splitting of the administered contrast agent dose (ie,...
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Background/aims: Many Post-ERCP pancreatitis (PEP) risk factors, including pancreatic duct cannulation, have been identified; however, whether the number of repeated and unintentional wire placements (WPs) in the pancreatic duct during wire-guided cannulation affects PEP risk is unknown. We aimed to identify the effects of repeated WP in the pancr...
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Background and aim: EUS-guided pancreatic duct drainage (EUS-PD) has been proposed for pancreatic duct obstruction after failure of endoscopic retrograde pancreatography (ERP). We evaluate the long-term outcomes of EUS-PD using a fully covered self-expandable metal stent (FCSEMS) for pancreaticojejunal anastomosis (PJA) strictures following Whippl...
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Background Most of breast cancer patients survive for a long-term period. The existing assessment of survivors’ prognosis has had some limitations in breast cancer because it is based on an evaluation at the time of diagnosis. Conditional survival reflects change over time after diagnosis and treatment of cancer. Conditional disease-free survival (...
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Background Since the introduction of nab-paclitaxel plus gemcitabine (nab-P + GEM) as first-line (1L) treatment for metastatic pancreatic adenocarcinoma (mPDAC), optimal second-line (2L) chemotherapy after progression is unclear. We assessed clinical outcomes of 2L chemotherapy for disease that progressed on 1L nab-P + GEM. Methods Among the 203 p...
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Recently, hybrid operations featuring vascular interventions have become more common, but applications in the thoracic surgery are few. Superior vena cava (SVC) resection and reconstruction is a typical complex thoracic surgery. Traditional SVC resection/reconstruction requires advanced vascular surgical skills. We developed a simple and safe proce...
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Background Recently, laparoscopic distal pancreatectomy (LDP) has become the standard procedure for resection of left-sided pancreatic tumors. Fluid collection (FC) at the resection margin of the pancreatic stump after LDP is a frequent radiological finding. However, there have been few treatment guidelines and the optimal management for this clini...
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Background To evaluate the clinicopathological factors and the oncology outcomes of invasive lobular carcinoma (ILC) patients compared with those of invasive ductal carcinoma (IDC) patients. Methods This study was a medical record review based on a prospectively-collected database. We surveyed the clinicopathological characteristics and oncology s...
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Background and aims: Endoscopic ultrasound-guided gallbladder drainage (EUS-GBD) using antimigrating tubular self-expandable metal stent (ATSEMS) is performed in high surgical risk patients with acute cholecystitis. The newly introduced lumen-apposing metal stent (LAMS) is expected to reduce the risk of tubular SEMS-related adverse events such as...
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In ultrasound/computed tomography (CT) fusion images, ultrasound allows visualization of the target in real time. CT provides a navigation for ultrasound scanning and improves the overview in areas of limited visualization with ultrasound. This study was performed to investigate the feasibility of ultrasound/CT fusion based on an electromagnetic tr...
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Purpose: Since the introduction of nab-paclitaxel plus gemcitabine (nab-P+GEM) as first-line (1L) treatment for metastatic pancreatic adenocarcinoma (mPDAC), optimal second-line (2L) chemotherapy after progression is unclear. We assessed clinical outcomes of 2L chemotherapy for disease that progressed on 1L nab-P+GEM. Materials and methods: Amon...
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Background This study aims to investigate the noninferiority of Enhanced Recovery After Surgery (ERAS) for pancreaticoduodenectomy (PD). Methods In this single‐center trial, we randomly assigned 276 adult patients who underwent open pancreaticoduodenectomy into ERAS and conventional groups with 138 patients in each, from 2015 through 2017. The pri...
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Background: Several studies evaluated the current guideline of the American Society for Gastrointestinal Endoscopy (ASGE) and reported only suboptimal accuracy. This study evaluated the diagnostic performance of the ASGE guideline based on computed tomography (CT) and role of endoscopic ultrasonography (EUS) and magnetic resonance cholangiopancrea...
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Computed tomography angiography is widely used for the assessment of various mesenteric vascular and bowel diseases in humans. However, there are only few studies that describe CT angiography application to mesenteric vessels in dogs. In this prospective, experimental, exploratory study, the mesenteric vasculature and enhancement pattern of the int...