Publications by authors named "Won H Lee"

Brain age, an emerging biomarker for brain diseases and aging, is typically predicted using single-modality T1-weighted structural MRI data. This study investigates the benefits of integrating structural MRI with diffusion MRI to enhance brain age prediction. We propose an attention-based deep learning model that fuses global-context information from structural MRI with local details from diffusion metrics.

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  • - The study introduces a new deep learning algorithm called feature fusion temporal convolutional network (FFTCN) designed to automate sleep staging using single-channel EEG data, addressing the time-consuming and subjective nature of traditional methods.
  • - FFTCN combines a 1D CNN for extracting temporal features and a 2D CNN for time-frequency features from spectrograms, which are then fused and classified using a temporal convolutional network (TCN).
  • - The proposed algorithm shows improved accuracy in classifying sleep stages among healthy subjects across multiple datasets, highlighting its potential to streamline professional sleep monitoring and reduce the workload on sleep technicians.
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Introduction: Abnormalities in the hippocampus have been extensively reported in schizophrenia research. However, inconsistent findings exist, and how structural and functional abnormalities of the hippocampus are associated with clinical symptoms in schizophrenia, especially concerning clozapine treatment, remains uncertain.

Methods: We recruited 52 patients with schizophrenia, each with an illness duration of at least 5 years, and categorized them based on clozapine treatment.

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Interface engineering is pivotal for enhancing the performance and stability of devices with layered structures, including solar cells, electronic devices, and electrochemical systems. Incorporating the interfacial dipole between the bulk layers effectively modulates the energy level difference at the interface and does not significantly influence adjacent layers overall. However, interfaces can drastically affect adjoining layers in ultrathin devices, which are essential for next-generation electronics with high integrity, excellent performance, and low power consumption.

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  • - A new mouse model (STZ + HFD) mimicking the progression of metabolic dysfunction-associated steatotic liver disease (MASLD) has been developed, showcasing stages from fatty liver to liver cancer.
  • - This model reflects hepatic transcriptomic features similar to those found in obese type 2 diabetes patients, allowing for better study of the disease's mechanisms and effects.
  • - Interventions such as dietary changes and tirzepatide treatment effectively reduce liver issues in this model, presenting potential avenues for treating MASLD in humans.
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Somatic cells accumulate genomic alterations with age; however, our understanding of mitochondrial DNA (mtDNA) mosaicism remains limited. Here we investigated the genomes of 2,096 clones derived from three cell types across 31 donors, identifying 6,451 mtDNA variants with heteroplasmy levels of ≳0.3%.

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The treatment of hydrocephalus with a ventriculoperitoneal (VP) shunt can lead to complications such as shunt migration. A 67-year-old male, who had previously undergone VP shunt surgery for normal-pressure hydrocephalus, presented approximately five years later with symptoms of general weakness and abdominal pain. Imaging revealed shunt malpositioning, with the catheter passing through an abnormal route to the heart.

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Background: Effective bowel cleansing is essential for a successful colonoscopy. Laxatives, such as polyethylene glycol, are commonly used for bowel preparation. Vomiting is a frequent complication during bowel preparation, and forceful vomiting can potentially lead to esophageal perforation, as reported in several previous cases.

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Background: Chronic Subdural Hemorrhage(cSDH) is often treated with surgical blood drainage, but concerns about recurrence and outcomes persist. Surgical techniques, including irrigation, vary. This study compares the outcomes of irrigation in cSDH surgery.

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Objective: This study aimed to evaluate the clinical effects of medial branch blocks (MBBs) C2 and C3 in treating patients with medically intractable headaches.

Methods: The medical records of 81 patients with medically intractable headaches who underwent a C2/3 MBB between January 2019 and March 2022 were retrospectively reviewed. The degrees of pain were evaluated using a Visual analogue scale (VAS) score (rating 0-10) on baseline and after procedures.

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Introduction: We conducted a multilayer network analysis in patients with juvenile myoclonic epilepsy (JME) and healthy controls, to investigate the gray matter layer using a morphometric similarity network and analyze the white matter layer using structural connectivity.

Methods: We enrolled 42 patients with newly diagnosed JME and 53 healthy controls. Brain magnetic resonance imaging (MRI) using a three-tesla MRI scanner, including T1-weighted imaging and diffusion tensor imaging (DTI) were performed.

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Proper monitoring of anesthesia stages can guarantee the safe performance of clinical surgeries. In this study, different anesthesia stages were classified using near-infrared spectroscopy (NIRS) signals with machine learning. The cerebral hemodynamic variables of right proximal oxyhemoglobin (HbO) in maintenance (MNT), emergence (EM) and the consciousness (CON) stage were collected and then the differences between the three stages were compared by phase-amplitude coupling (PAC).

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Sarcopenia, characterized by progressive muscle loss and functional decline, poses significant risks, including falls, impaired daily activities, and increased mortality. We developed Allgeun, a novel device that measures handgrip strength, muscle mass, and physical performance. This study aimed to investigate whether temporal muscle thickness (TMT) could be used as a sarcopenia marker and to evaluate the usability of Allgeun.

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  • The study investigated the relationship between white matter (WM) tracts and severity of obstructive sleep apnea (OSA) using correlation tractography.
  • Participants (40 with OSA) underwent diffusion tensor imaging (DTI) to analyze various diffusion metrics and correlate them with the apnea-hypopnea index (AHI) as a measure of OSA severity.
  • Results showed a negative correlation between the AHI and fractional anisotropy (FA) values in several specific WM tracts, indicating OSA severity may involve changes in tissue properties rather than neuronal loss.
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Checkpoint kinase 1 (Chk1) is a key mediator of the DNA damage response that regulates cell cycle progression, DNA damage repair, and DNA replication. Small-molecule Chk1 inhibitors sensitize cancer cells to genotoxic agents and have shown preclinical activity as single agents in cancers characterized by high levels of replication stress. However, the underlying genetic determinants of Chk1-inhibitor sensitivity remain unclear.

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Purpose: In this study, we determined whether there were significant differences in procedure time, radiation dose, fluoroscopy time, and total contrast media dose when unruptured wideneck bifurcation aneurysms (WNBAs) were treated with the Woven EndoBridge (WEB) device and stent-assisted coil (SAC) embolization.

Materials And Methods: The WEB device and SAC embolization (14:17) were used to treat 31 cases of internal carotid artery bifurcation, anterior communicating artery, middle cerebral artery bifurcation, and basilar bifurcation aneurysms between August 2021 and December 2022. The procedure time, radiation dose, fluoroscopy time, and total contrast medium dose between the 2 treatment groups were compared and analyzed.

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This study aimed to implement a deep learning-based super-resolution (SR) technique that can assist in the diagnosis and surgery of trigeminal neuralgia (TN) using magnetic resonance imaging (MRI). Experimental methods applied SR to MRI data examined using five techniques, including T2-weighted imaging (T2WI), T1-weighted imaging (T1WI), contrast-enhancement T1WI (CE-T1WI), T2WI turbo spin-echo series volume isotropic turbo spin-echo acquisition (VISTA), and proton density (PD), in patients diagnosed with TN. The image quality was evaluated using the peak signal-to-noise ratio (PSNR) and structural similarity index (SSIM).

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This experimental study was designed to evaluate the effect of ulinastatin, a urinary trypsin inhibitor, on postoperative cognitive dysfunction (POCD) in rats under general anesthesia with isoflurane, on the aspect of behavior, as evaluated using a Y-maze test and focusing on microglial activity. Ulinastatin (50,000 U/mL) and normal saline (1 mL) were randomly (1:1) administered intraperitoneally to the ulinastatin and control groups, respectively, before general anesthesia. Anesthesia with isoflurane 1.

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This study aimed to reveal the pathophysiology of isolated rapid eye movement sleep behaviour disorder (RBD) in patients using multilayer network analysis. Participants eligible for isolated RBD were included and verified via polysomnography. Both iRBD patients and healthy controls underwent brain MRI, including T1-weighted imaging and diffusion tensor imaging.

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Background: Mitochondrial dysfunction is a primary driver of cardiac contractile failure; yet, the cross talk between mitochondrial energetics and signaling regulation remains obscure. Ponatinib, a tyrosine kinase inhibitor used to treat chronic myeloid leukemia, is among the most cardiotoxic tyrosine kinase inhibitors and causes mitochondrial dysfunction. Whether ponatinib-induced mitochondrial dysfunction triggers the integrated stress response (ISR) to induce ponatinib-induced cardiotoxicity remains to be determined.

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  • Sirtuin 3 (SIRT3) is important for mitochondrial function under oxidative stress, but its role in radioresistant cancer cells, particularly in relation to glucose deprivation, is not well understood.
  • This study investigates SIRT3's impact on cell proliferation and death in two radioresistant head and neck cancer cell lines with different p53 statuses, revealing that SIRT3 levels are linked to cell sensitivity to glucose deficiency.
  • Findings show that the EZH2 protein represses SIRT3 expression in p53-deficient cells, and that regulating SIRT3 through EZH2 could serve as a potential biomarker for personalized treatment options in radiation-resistant cancer patients.
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Alzheimer's disease (AD) is characterized by cognitive impairment. It is common in the elderly. Etiologically, dysfunction of cholinergic neurotransmitter system is prominent in AD.

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  • - The study investigates the link between the tonsil microbiome and tonsillar hypertrophy, which is related to disordered breathing and obesity in children, indicating an important area for research.
  • - Using 16S rRNA sequencing, researchers found that children with obesity and enlarged tonsils showed similar tonsil microbiome profiles and changes in microbiome composition.
  • - A significant correlation was found between the tonsil microbiome and indicators of liver metabolism, with elevated alanine aminotransferase (ALT) levels in children suffering from both obesity and tonsillar hypertrophy, highlighting the importance of understanding this microbiome for childhood health.
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Objectives: Sinonasal squamous cell carcinoma (SCC) follows a poor prognosis with high tendency for local recurrence. We aimed to evaluate whether MRI radiomics can predict early local failure in sinonasal SCC.

Methods: Sixty-eight consecutive patients with node-negative sinonasal SCC (January 2005-December 2020) were enrolled, allocated to the training (n = 47) and test sets (n = 21).

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Background: Rare genetic variants and genetic variation at loci in an enhancer in SOX17 (SRY-box transcription factor 17) are identified in patients with idiopathic pulmonary arterial hypertension (PAH) and PAH with congenital heart disease. However, the exact role of genetic variants or mutations in SOX17 in PAH pathogenesis has not been reported.

Methods: SOX17 expression was evaluated in the lungs and pulmonary endothelial cells (ECs) of patients with idiopathic PAH.

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