Gechevska, Valentina
Preferred name
Gechevska, Valentina
Official Name
Gechevska, Valentina
Main Affiliation
Email
valentina.gecevska@mf.edu.mk
15 results
Now showing 1 - 10 of 15
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Item type:Publication, Statistical analysis and machine learning-based modelling of kerf width in CO2 laser cutting of PMMA(Jan Evangelista Purkyne University in Usti nad Labem, 2024-12-21); ; ; Engineering polymers like PMMA have increasingly replaced traditional materials where feasible, with CO2 laser cutting gaining attention for its high quality and speed in processing these materials. Precise cuts are essential for product accuracy, with kerf width being a key quality attribute for ensuring the final product's quality. This study focuses on the impact of three process variables: stand-off distance, laser power, and cutting speed, on the kerf width in CO2 laser cutting of PMMA. A full-factorial experiment systematically varies process parameters to understand their individual and interaction effects on the cutting process. The kerf width is measured as an indicator of precision to evaluate the quality of the laser cuts. In order to address the non-linear relationships between these process parameters and kerf width, several machine learning models were utilized. Performance comparisons indicated that the Artificial Neural Network (ANN) model provided the highest accuracy, with R² values of 0.98 for the validation dataset and 0.95 for the testing dataset. The optimized ANN model is a robust tool for parameter optimization, determining optimal settings to achieve the desired kerf width and ensure productivity. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Implementation of Machine Learning for Enhancing Lean Manufacturing Practices for Metal Additive Manufacturing(Institute of Electrical and Electronics Engineers (IEEE), 2024); ; ; ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Defect classification and dimensional estimation in single-point exposure laser powder bed fusion of lattice struts using optical emission spectroscopy(Springer Science and Business Media LLC, 2025-06-03); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, 225 Basic/Advanced Life Support Training for Healthcare Professionals in the European Union(Elsevier BV, 2024-11) - Some of the metrics are blocked by yourconsent settings
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Item type:Publication, Modelling of multiple surface roughness parameters during hard turning: A comparative study between the kinematical-geometrical copying approach and the design of experiments method (DOE)(Production Engineering Institute (PEI), Faculty of Mechanical Engineering, 2022-03-15); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Energy input adaptation according to part geometry in selective laser melting through empirical modelling of thermal emission(Faculty of Technical Sciences, 2022-06-15); ; Previtali, Barbara - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Spectral emission characteristics of single point exposure LPBF process(Elsevier BV, 2024); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Employment of machine learning techniques for crop yield forecasting based on climate parameters(Mathematical Modelling, 2022); ; ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication,