Publications by authors named "Yu-Rang Park"

Article Synopsis
  • This study focused on using digital phenotypes and machine learning to predict panic symptoms in patients with mood and anxiety disorders, monitoring 43 individuals over two years through smartphone and wearable data.
  • The analysis distinguished between days leading up to panic (DBP) and stable symptom-free days, utilizing machine learning models like RandomForest, GradientBoost, and XGBoost to evaluate nearly 4,000 data points.
  • The XGBoost model showed strong predictive performance with an ROC-AUC score of 0.905, identifying key factors such as childhood trauma, step counts, and anxiety levels that could help develop personalized digital therapies for better panic management.
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Introduction: Pediatric Crohn's disease (CD) easily progresses to an active disease compared with adult CD, making it important to predict and minimize CD relapses. However, prediction of relapse at various time points (TPs) during pediatric CD remains understudied. We aimed to develop a real-time aggregated model to predict pediatric CD relapse in different TPs and time windows (TWs).

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Background: In children with autism spectrum disorder (ASD), problem behaviors play a dysfunctional role, causing as much difficulty with daily living and adjustment as the core symptoms. If such behaviors are not effectively addressed, they can result in physical, economic, and psychological issues not only for the individual but also for family members.

Objective: We aimed to develop and evaluate the feasibility of a mobile app-assisted parent training program for reducing problem behaviors in children with ASD.

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Article Synopsis
  • Federated learning in healthcare enables collaboration on model training using distributed data while maintaining privacy; however, traditional methods struggle to utilize unique institutional data features.* -
  • A new method called personalized progressive federated learning (PPFL) was proposed, which considers client-specific features and showed superior performance in in-hospital mortality prediction, with an accuracy of 0.941 and AUROC of 0.948.* -
  • PPFL not only outperformed conventional federated models but also retained strong performance with cancer data, identifying key features linked to mortality for different institutions.*
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  • Acute kidney injury (AKI) is a serious condition indicating renal toxicity, and current studies on predicting AKI using distributed research networks (DRN) with time series data are limited.
  • The study aimed to identify early AKI occurrences in patients taking nephrotoxic medications by employing an interpretable long short-term memory (LSTM) model using hospital electronic health records from six different institutions.
  • Results showed a significant analysis of 39,655 patients, revealing that vancomycin led to earlier AKI onset compared to other drugs, with the predictive model achieving high accuracy, particularly for acyclovir, which produced an impressive average score of 0.94 in predicting AKI risk.
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Objective: Early detection and intervention of developmental disabilities (DDs) are critical to improving the long-term outcomes of afflicted children. In this study, our objective was to utilize facial landmark features from mobile application to distinguish between children with DDs and typically developing (TD) children.

Methods: The present study recruited 89 children, including 33 diagnosed with DD, and 56 TD children.

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Objectives: Skin cancer is a prevalent type of malignancy, necessitating efficient diagnostic tools. This study aimed to develop an automated skin lesion classification model using the dynamically expandable representation (DER) incremental learning algorithm. This algorithm adapts to new data and expands its classification capabilities, with the goal of creating a scalable and efficient system for diagnosing skin cancer.

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The differential diagnosis for optic atrophy can be challenging and requires expensive, time-consuming ancillary testing to determine the cause. While Leber's hereditary optic neuropathy (LHON) and optic neuritis (ON) are both clinically significant causes for optic atrophy, both relatively rare in the general population, contributing to limitations in obtaining large imaging datasets. This study therefore aims to develop a deep learning (DL) model based on small datasets that could distinguish the cause of optic disc atrophy using only fundus photography.

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Background: Accurate and timely assessment of children's developmental status is crucial for early diagnosis and intervention. More accurate and automated developmental assessments are essential due to the lack of trained health care providers and imprecise parental reporting. In various areas of development, gross motor development in toddlers is known to be predictive of subsequent childhood developments.

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Purpose: In artificial intelligence-based modeling, working with a limited number of patient groups is challenging. This retrospective study aimed to evaluate whether applying synthetic data generation methods to the clinical data of small patient groups can enhance the performance of prediction models.

Materials And Methods: A data set collected by the Cancer Registry Library Project from the Yonsei Cancer Center (YCC), Severance Hospital, between January 2008 and October 2020 was reviewed.

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Background: Moyamoya disease (MMD) is a rare and complex pathological condition characterized by an abnormal collateral circulation network in the basal brain. The diagnosis of MMD and its progression is unpredictable and influenced by many factors. MMD can affect the blood vessels supplying the eyes, resulting in a range of ocular symptoms.

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Importance: Screening for autism spectrum disorder (ASD) is constrained by limited resources, particularly trained professionals to conduct evaluations. Individuals with ASD have structural retinal changes that potentially reflect brain alterations, including visual pathway abnormalities through embryonic and anatomic connections. Whether deep learning algorithms can aid in objective screening for ASD and symptom severity using retinal photographs is unknown.

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Sepsis is a dysregulated immune response to infection that leads to organ dysfunction and is associated with a high incidence and mortality rate. The lack of reliable biomarkers for diagnosing and prognosis of sepsis is a major challenge in its management. We aimed to investigate the potential of three-dimensional label-free CD8 + T cell morphology as a biomarker for sepsis.

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Article Synopsis
  • This study aimed to create a deep learning model to predict drug-induced liver injury (DILI) in patients taking angiotensin receptor blockers (ARBs) using data from six hospitals in Korea.
  • A retrospective analysis of 10,852 patient records revealed a 1.09% incidence rate of DILI, varying by drug, with valsartan having the highest rate (1.24%) and olmesartan the lowest (0.83%).
  • The model's prediction performance was strong, particularly for telmisartan, losartan, and irbesartan, highlighting useful variables like hematocrit and albumin for better clinical decision-making.
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Background: Heterogeneity in clinical manifestation and underlying neuro-biological mechanisms are major obstacles to providing personalized interventions for individuals with autism spectrum disorder (ASD). Despite various efforts to unify disparate data modalities and machine learning techniques for subclassification, replicable ASD clusters remain elusive. Our study aims to introduce a novel method, utilizing the objective behavioral biomarker of gaze patterns during joint attention, to subclassify ASD.

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Background: Not all non-small cell lung cancer (NSCLC) patients will benefit from immune checkpoint therapy and use of these medications carry serious autoimmune adverse effects. Therefore, biomarkers are needed to better identify patients who will benefit from its use. Here, the correlation of overall survival (OS) with baseline and early treatment period serum biomarker responses was evaluated in patients with NSCLC undergoing immunotherapy.

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Background: While mobile health apps have demonstrated their potential in revolutionizing health behavior changes, the impact of a mobile community built on these apps on the level of physical activity and mental well-being in cancer survivors remains unexplored.

Objective: In this randomized controlled trial, we examine the effects of participation in a mobile health community specifically designed for breast cancer survivors on their physical activity levels and mental distress.

Methods: We performed a single-center, randomized, parallel-group, open-label, controlled trial.

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Background: Autism spectrum disorder (ASD) is characterised by abnormalities in social interactions and restricted and repetitive behaviors. Children with high-functioning ASD (HFASD), lack social communication skills, do not interact with others, and lack peer relationships. We aimed to develop, and evaluate the feasibility of, a metaverse-based programme to enhance the social skills of children with HFASD.

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Article Synopsis
  • Early diagnosis and treatment of meningitis and encephalitis are critical, prompting a study to create and test an AI model for determining the causes of these conditions.
  • The study involved analyzing data from 283 patients to develop the AI model and validating it with 220 additional patients, focusing on four potential causes: autoimmunity, bacteria, virus, and tuberculosis.
  • The AI model significantly outperformed human clinicians in identifying the causes of meningitis and encephalitis, achieving high accuracy metrics, which underscores its potential for improving patient outcomes in these severe conditions.*
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Background: Children's motor development is a crucial tool for assessing developmental levels, identifying developmental disorders early, and taking appropriate action. Although the Korean Developmental Screening Test for Infants and Children (K-DST) can accurately assess childhood development, its dependence on parental surveys rather than reliable, professional observation limits it. This study constructed a dataset based on a skeleton of recordings of K-DST behaviors in children aged between 20 and 71 months, with and without developmental disorders.

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Importance: Joint attention, composed of complex behaviors, is an early-emerging social function that is deficient in children with autism spectrum disorder (ASD). Currently, no methods are available for objectively quantifying joint attention.

Objective: To train deep learning (DL) models to distinguish ASD from typical development (TD) and to differentiate ASD symptom severities using video data of joint attention behaviors.

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Background: Ischemic stroke with active cancer is thought to have a unique mechanism compared to conventional stroke etiologies. There is no gold standard guideline for secondary prevention in patients with cancer-related stroke, hence, adequate type of antithrombotic agent for treatment is controversial.

Methods: Subjects who were enrolled in National Health Insurance System Customized Research data during the period between 2010 and 2015 were observed until 2019.

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