Publications by authors named "Hyungsoo Han"

Cervical cancer is a significant health challenge, yet it can be effectively prevented through early detection. Cytology-based screening is critical for identifying cancerous and precancerous lesions; however, the process is labor-intensive and reliant on trained experts to scan through hundreds of thousands of mostly normal cells. To address these challenges, we propose a novel distribution-augmented approach using contrastive self-supervised learning for detecting abnormal squamous cervical cells from cytological images.

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Screening is critical for prevention and early detection of cervical cancer but it is time-consuming and laborious. Supervised deep convolutional neural networks have been developed to automate pap smear screening and the results are promising. However, the interest in using only normal samples to train deep neural networks has increased owing to the class imbalance problems and high-labeling costs that are both prevalent in healthcare.

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objectives: Telomerase reverse transcriptase () promoter mutation, found in a subset of patients with thyroid cancer, is strongly associated with aggressive biologic behavior. Predicting promoter mutation is thus necessary for the prognostic stratification of thyroid cancer patients. In this study, we evaluate promoter mutation status in thyroid cancer through the deep learning approach using histologic images.

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Group B (GBS, ) is a Gram-positive bacterium that is commonly found in the gastrointestinal and urogenital tracts. However, its colonization during pregnancy is an important cause of maternal and neonatal morbidity and mortality worldwide. Herein, we specifically looked at GBS in relation to the field of Obstetrics (OB) along with the field of Gynecology (GY).

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Article Synopsis
  • - The study evaluated a new screening method called the Loop-Mediated Isothermal Amplification (LAMP) assay for detecting group B streptococcus (GBS) in pregnant women, comparing it to the standard polymerase chain reaction (PCR) assay.
  • - Involved 527 pregnant women, ages 19-44, and found that LAMP had 100% sensitivity and specificity when compared to the PCR assay, while showing lower sensitivity and specificity when compared to traditional microbiological culture.
  • - The results suggest that the LAMP assay is a reliable and quick method for GBS screening, performing similarly to the existing PCR test.
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Alzheimer's disease (AD) is a neurodegenerative disorder characterized by a progressive loss of memory and cognition. One of the hallmarks of AD is the accumulation of beta-amyloid (Aβ). Although endoplasmic reticulum stress, mitochondrial dysfunction, and oxidative stress have been implicated in Aβ toxicity, the molecular mechanism(s) of Aβ-induced neurotoxicity are not fully understood.

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Amantadine is currently used as an antiviral and an antiparkinsonian drug. Although the drug is known to bind a viral proton channel protein, the mechanism of action in Parkinson's disease (PD) remains to be determined. This study investigated whether the drug has an inhibitory effect on microglial activation and neuroinflammation, which have been implicated in the progression of neurodegenerative processes.

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The secreted protein lipocalin-2 (LCN2) has been implicated in diverse cellular processes, including cell morphology and migration. Little is known, however, about the role of LCN2 in the CNS. Here, we show that LCN2 promotes cell migration through up-regulation of chemokines in brain.

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Microencapsulation of drugs into solid biodegradable polymeric microspheres via solvent evaporation technique remains challenging especially with those having low molecular weight and high hydrophilicity nature. This paper presents an efficient encapsulation protocol for this group of drugs, demonstrated using hydrogen peroxide as a model compound that is encapsulated into poly(lactic-co-glycolic acid) microspheres. Hydrogen peroxide can be employed as antiseptic agent or its decomposed form into oxygen can be useful in various pharmaceutical applications.

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Article Synopsis
  • Focal cerebral ischemia, or stroke, occurs when blood supply to the brain is suddenly interrupted, and researchers aimed to find peptides that can target stroke-affected tissue to detect dying cells.* -
  • A specific peptide, CLEVSRKNC, was identified through screening a phage library and was shown to preferentially accumulate in ischemic stroke areas of rats without affecting healthy brain tissue.* -
  • The CLEVSRKNC peptide binds to apoptotic neuronal cells in the penumbra region, indicating potential uses for molecular imaging and targeted drug delivery in stroke treatment.*
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