• Title/Summary/Keyword: proximal

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Overlap myositis associated with Sjögren's syndrome

  • Eun Ji Lee;Rae On Kim;Yon Hee Kim;Hakjae Roh
    • Annals of Clinical Neurophysiology
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    • v.25 no.1
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    • pp.41-44
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    • 2023

  • Overlap myositis (OM) associated with Sjögrens syndrome (SS) is a relatively uncommon disorder. It is more difficult to detect OM when a patient had not been previously diagnosed with SS. We report a case of OM associated SS that initially presented with dysphagia followed by proximal weakness. If proximal muscle weakness is preceded by dysphagia, the possibility of OM associated with connective-tissue disease should be considered.

  • https://doi.org/10.14253/acn.2023.25.1.41 인용 PDF

L1-penalized AUC-optimization with a surrogate loss

  • Hyungwoo Kim;Seung Jun Shin
    • Communications for Statistical Applications and Methods
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    • v.31 no.2
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    • pp.203-212
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    • 2024

  • The area under the ROC curve (AUC) is one of the most common criteria used to measure the overall performance of binary classifiers for a wide range of machine learning problems. In this article, we propose a L1-penalized AUC-optimization classifier that directly maximizes the AUC for high-dimensional data. Toward this, we employ the AUC-consistent surrogate loss function and combine the L1-norm penalty which enables us to estimate coefficients and select informative variables simultaneously. In addition, we develop an efficient optimization algorithm by adopting k-means clustering and proximal gradient descent which enjoys computational advantages to obtain solutions for the proposed method. Numerical simulation studies demonstrate that the proposed method shows promising performance in terms of prediction accuracy, variable selectivity, and computational costs.

  • https://doi.org/10.29220/CSAM.2024.31.2.203 인용 PDF

F-REGULAR RELATIONS

  • Song, Hyungsoo
    • Korean Journal of Mathematics
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    • v.8 no.2
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    • pp.181-186
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    • 2000

  • We define the concept of a F-regular flow as a generalization of that of a F-proximal flow, and investigate its properties.

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