Faculty of Computer Science and Engineering
Permanent URI for this communityhttps://repository.ukim.mk/handle/20.500.12188/5
The Faculty of Computer Science and Engineering (FCSE) within UKIM is the largest and most prestigious faculty in the field of computer science and technologies in Macedonia, and among the largest
faculties in that field in the region.
The FCSE teaching staff consists of 50 professors and 30 associates. These include many “best in field” personnel, such as the most referenced scientists in Macedonia and the most influential professors in the ICT industry in the Republic of Macedonia.
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Item type:Publication, Influence of the Yu T-norm on Vaguely Quantified Rough Set Measure Algorithm Accuracy(IEEE, 2022-11-16); ; This study aims to understand the impact of the Yu T-norm on the Vaguely Quantified Rough Set measurement algorithm, which combines the fuzzy and rough set theories. The algorithm uses both theories and concepts such as lower and higher approximations that integrate numerous features like T-norms, fuzzy tolerance relationship metrics, implicators, ambiguous quantifiers etc. to improve the process of real-world datasets to obtain more accurate models. The investigation process focusses on the experimental evaluation of Yu T-norm models obtained on various real-world datasets. The adjusted p-value is obtained using the insights generated by the AUC-ROC metric from the experimental assessment and a two-step approach for estimating the statistical significance. The results show that the k-parameter in Yu T-norm has impact on model performance and that the five fuzzy tolerance metrics that are studied also have impact on the model's accuracy on unseen data for the Yu T-norm. Therefore, we can conclude that a specific configuration of the k-parameter for the Yu T-norm can directly influence the overfitting of the final model. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Methodology for food prices forecasting(IEEE, 2023-12-15) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Blood Oxygen Saturation Estimation Using PPG Signals from the MIMIC-III Database(Springer, Cham, 2025-04-23); Madevska Bogdanova, AnaPhotoplethysmogram (PPG) signals are pivotal in cardiovascular monitoring, offering real-time insights into heart rate and oxygen saturation (SpO2). This study explores the creation of deep learning and machine learning models - specifically Convolutional Neural Networks (CNNs), Bidirectional Long Short-Term Memory (BiLSTM) networks, Recurrent Neural Networks (RNNs), and Random Forest Regressors (RFRs)-to estimate SpO2 levels from single-channel PPG data. Another point is developing algorithms for using the data sourced from the PhysioNet MIMIC-III database. The patients used for training and testing are distinct, ensuring no overlap between the datasets and enabling rigorous model evaluation. A comprehensive analyses reveal that LSTM-based model achieve significant accuracy in SpO2 estimation, with R-squared value reaching up to 0.59. Specifically, the LSTM model demonstrated an MAE of 1.26, MSE of 3.11 and RMSE of 1.76. These results demonstrate the potential of machine learning techniques in advancing clinical monitoring and decision-making processes within critical care environments, thereby enhancing patient care outcomes. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Blood Oxygen Saturation Estimation with Laser-Induced Graphene Respiration Sensor(Hindawi Limited, 2024-01-29); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Sentiment Analysis in Finance: From Transformers Back to eXplainable Lexicons (XLex)(Institute of Electrical and Electronics Engineers (IEEE), 2024-01); ; Lexicon-based sentiment analysis in finance leverages specialized, manually annotated lexicons created by human experts to extract sentiment from financial texts effectively. Although lexicon-based methods are simple to implement and fast to operate on textual data, they require considerable manual annotation efforts to create, maintain, and update the lexicons. These methods are also considered inferior to the deep learning-based approaches, such as transformer models, which have become dominant in various natural language processing (NLP) tasks due to their remarkable performance. However, their efficacy comes at a cost: these models require extensive data and computational resources for both training and testing. Additionally, they involve significant prediction times, making them unsuitable for real-time production environments or systems with limited processing capabilities. In this paper, we introduce a novel methodology named eXplainable Lexicons (XLex) that combines the advantages of both lexicon-based methods and transformer models. We propose an approach that utilizes transformers and SHapley Additive exPlanations (SHAP) for explainability to automatically learn financial lexicons. Our study presents four main contributions. Firstly, we demonstrate that transformer-aided explainable lexicons can enhance the vocabulary coverage of the benchmark Loughran-McDonald (LM) lexicon. This enhancement leads to a significant reduction in the need for human involvement in the process of annotating, maintaining, and updating the lexicons. Secondly, we show that the resulting lexicon outperforms the standard LM lexicon in sentiment analysis of financial datasets. Our experiments show that XLex outperforms LM when applied to general financial texts, resulting in enhanced word coverage and an overall increase in classification accuracy by 0.431. Furthermore, by employing XLex to extend LM, we create a combined dictionary, XLex+LM, which achieves an even higher accuracy improvement of 0.450. Thirdly, we illustrate that the lexicon-based approach is significantly more efficient in terms of model speed and size compared to transformers. Lastly, the proposed XLex approach is inherently more interpretable than transformer models. This interpretability is advantageous as lexicon models rely on predefined rules, unlike transformers, which have complex inner workings. The interpretability of the models allows for better understanding and insights into the results of sentiment analysis, making the XLex approach a valuable tool for financial decision-making. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Machine learning based SpO2 prediction from PPG signal's characteristics features(IEEE, 2022-06-22);