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    Experience of Distance Learning of Medical Science Disciplines as a Result of the Global Pandemic COVID-19 in Ukraine and South Africa
    (2022) Luckrajh, Jeshika; Vovk, Oleh; Erokhina, Victoria; Avilova, Olga; To, Uyen Nguyen Do; Stepanenko, Oleksandr
    Aim: This study discusses the historical background of distance learning and its pros and cons from the perspective of students and teachers. This study aimed to conduct a comparison of the effectiveness of distance learning during the quarantine period at Kharkiv National Medical University (KNMU), and the national lockdown at the University of Cape Town (UCT).Material and Methods: A survey was used to investigate student’s perspectives about distance education. An online survey consisting of 19 questions was conducted on Google Forms platform among 395 students at KNMU and among 124 students of UCT obtained from Vula site statistics. Individuals’ learning progress during histological and anatomical classes using different methods such as virtual aggregators of slides and 3D programs were also observed.Results: At KNMU, most students (72.2%, n=285) agreed that the main advantages of distance education were the extra time they had to prepare for classes and revise study materials whereas the major challenge they faced while having distance education was the lack of clinical approach to patients (69.1%, n=273). At UCT, students found that the most helpful aspect of distance learning was pre-recorded lecture videos (66.9%, n=83).Conclusion: The pandemic has shown that distance learning is possible, but the question remains: has it proved to be efficient, and is it an inseparable part of the education system today? The role of distance education in the twenty-first century can be summarized as distance education programs catching huge popularity in the educational world with having and spreading discussable sides.
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    Fractal Dimension of Silhouette Magnetic Resonance Brain Images as a Measure of Age-Associated Changes in Cerebral Hemispheres
    (Düzce Üniversitesi, 2023) Maryenko, Nataliia; Stepanenko, Oleksandr
    Aim: The aim of the present study was to characterize age-associated changes in the spatial configuration of cerebral hemispheres (including changes in spatial complexity and space-filling capacity) using fractal analysis of silhouette magnetic resonance brain images.Material and Methods: Magnetic resonance brain images of 100 (44 male, 56 female) participants aged between 18-86 years were studied. Five magnetic resonance images were selected from the magnetic resonance imaging dataset of each brain, including four tomographic sections in the coronal plane and one in the axial plane. Fractal dimension values of the cerebral hemispheres silhouettes were measured using the two-dimensional box-counting algorithm. Morphometric parameters based on Euclidean geometry (perimeter, area, and their derivative values) were determined as well.Results: The average fractal dimension value of the five studied tomographic sections was 1.878±0.0009, the average value of four coronal sections was 1.868±0.0010. It was shown that fractal dimension values of cerebral silhouettes for all studied tomographic sections and four coronal sections significantly decrease with age (r=-0.512, p lt;0.001 and r=-0.491, p lt;0.001, respectively). The difference in the character of age-related changes in males and females was not statistically significant. Based on the age and the fractal dimension values of the studied sample, the confidence intervals of the fractal dimension values of cerebral hemispheres silhouettes were determined, which can be used as norm criteria in clinical neuroimaging.Conclusion: The fractal analysis and obtained data can be used in neuroimaging for assessing the degree of age-related cerebral atrophy and for differentiating between normal aging and neurodegenerative diseases.