4 research outputs found
Expectation of topological invariants
In this paper, we study the expectation values of topological invariants of
the Vietoris-Rips complex and \v{C}ech complex for a finite set of sample
points on a Riemannian manifold. We show that the Betti number and Euler
characteristic of the complexes are Lipschitz functions of the scale parameter
and that there is an interval such that the Betti curve converges to the Betti
number of the underlying manifold.Comment: 9 pages; 1 figur
An Arrhythmia Classification-Guided Segmentation Model for Electrocardiogram Delineation
Accurate delineation of key waveforms in an ECG is a critical initial step in
extracting relevant features to support the diagnosis and treatment of heart
conditions. Although deep learning based methods using a segmentation model to
locate P, QRS and T waves have shown promising results, their ability to handle
signals exhibiting arrhythmia remains unclear. In this study, we propose a
novel approach that leverages a deep learning model to accurately delineate
signals with a wide range of arrhythmia. Our approach involves training a
segmentation model using a hybrid loss function that combines segmentation with
the task of arrhythmia classification. In addition, we use a diverse training
set containing various arrhythmia types, enabling our model to handle a wide
range of challenging cases. Experimental results show that our model accurately
delineates signals with a broad range of abnormal rhythm types, and the
combined training with classification guidance can effectively reduce false
positive P wave predictions, particularly during atrial fibrillation and atrial
flutter. Furthermore, our proposed method shows competitive performance with
previous delineation algorithms on the Lobachevsky University Database (LUDB)