Publications Scientifiques
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Item Artificial Intelligence Based Detection of COVID-19 Pneumonia Using CT Scan and X-ray Images: A Comparative study(Institute of Electrical and Electronics Engineers Inc, 2023) Ilyas, Muhammad; Cherifi, DalilaAccording to a new study, a computer program that was trained to see patterns by analyzing thousands of chest X-rays was able to predict with up to 95% accuracy which patients with coronavirus disease (COVID-19) would develop life-threatening complications within four days. In order to quickly identify patients with COVID-19 whose condition is most likely to deteriorate, hospital physicians and radiologists require tools like our program.Unfortunately, we are fighting one of the worst epidemics ever known to mankind called COVID-2019, a coronavirus-derived pathogen. We see ground-glass opacity in the chest X-ray and CT scan images as a result of fibrosis in the lungs when the virus has reached the lungs. The artificial intelligence techniques can be used to identify and quantify the infection because of the significant differences between infected and non-infected X-ray images. A classification model for interpreting chest X-rays and CT scan images is proposed, which may lead to improved COVID-19 diagnosis. Classifying the chest X-rays into three categories, normal, viral pneumonia, and COVID-19, is our method of classification. Additionally, COVID-19 using CT scan images has higher classification accuracy as compared to x-ray images.Item Classification of Left/Right Hand and Foot Movements from EEG using Machine Learning Algorithms(Institute of Electrical and Electronics Engineers Inc, 2023) Cherifi, Dalila; Berghouti, Baha Eddine; Boubchir, LarbiIn recent years, there has been growing interest in utilizing Electroencephalography (EEG) data and machine learning techniques to develop innovative solutions for individuals with disabilities. The ability to accurately classify hands and foot motion based on EEG signals holds great potential for enabling individuals to regain control and functionality of their disabled parts, improving their quality of life and independence. Making a better solution than the traditional ones that often require physical contact or can be challenging to operate. In our study, we have focused on hands (right/left) and foot motion disabilities, using supervised Machine Learning algorithms for the classification of EEG data related to left/right hand and foot movements; aiming to reach accurate results that can contribute to providing a solution for people with this kind of motion disabilities. Three supervised machine learning algorithms are considered for the EEG classification, namely Linear Discriminant Analysis (LDA), K-Nearest Neighbors (KNN), and Support Vector Machine (SVM), using Common Spatial Patterns (CSP) algorithm and logarithm of the variance (logvar) for feature extraction. In our experiments, we adopted these algorithms to classify the Motor Imagery EEG dataset for hands and foot movements given in BCI Competition IV. The data we used went through different steps before fitting into the models such as filtering, feature extraction, and discrimination. We achieved significant success in accurately classifying hand movements in the initial experiment, attaining an impressive classification accuracy of up to 97.5% with SVM and LDA. Furthermore, in the multi-classification task involving both hand (right/left) and foot movements, KNN and SVM classifiers yielded commendable results up to 87%. These models can be further used and developed, where a hardware implementation will be done as a further work for this study.Item Performance Evaluation of Machine Learning Algorithms for Smart Irrigation Systems(Institute of Electrical and Electronics Engineers Inc, 2024) Yahia, Amina; Menasri, Wahiba; Cherifi, Dalila; Gacemi, AbderrezakSmart irrigation systems have revolutionized the farming industry by utilizing modern innovations to optimize water usage and handle water scarcity issues. The performance of two machine learning algorithms, Decision Tree and Support Vector Machines (SVM), in categorizing irrigation status in smart irrigation systems is evaluated in this research. The goal is to detect whether or not specified areas or plants have been watered, which is critical for proper irrigation management. Sensors in smart irrigation systems detect environmental data such as temperature, humidity, soil moisture, and rainfall. The obtained data is processed using machine learning methods to classify the irrigation status. For training and evaluation, this study makes use of a large dataset from a real-world smart irrigation system. The results demonstrate the effectiveness of both the Decision Tree and SVM algorithms. Decision Tree excels in terms of precision and recall, allowing for the accurate detection of hydrated and non-watered areas or plants. SVM achieves good accuracy and F1-score, allowing for a complete evaluation of irrigation status. These findings promote smart irrigation systems by emphasizing the importance of machine learning methods for accurate irrigation status classification. The findings help stakeholders choose appropriate algorithms for efficient water management and support sustainable agriculture practices.Item Bearing fault detection under time-varying speed based on empirical wavelet transform, cultural clan-based optimization algorithm, and random forest classifier(SAGE Publications, 2021) Moussaoui, Imane; Rahmoune, Chemseddine; Zair, Mohamed; Benazzouz, DjamelBearings are massively utilized in industries of nowadays due to their huge importance. Nevertheless, their defects can heavily affect the machines performance. Therefore, many researchers are working on bearing fault detection and classification; however, most of the works are carried out under constant speed conditions, while bearings usually operate under varying speed conditions making the task more challenging. In this paper, we propose a new method for bearing condition monitoring under time-varying speed that is able to detect the fault efficiently from the vibration signatures. First, the vibration signal is processed with the Empirical Wavelet Transform to extract the AM-FM modes. Next, time domain features are calculated from each mode. Then, the features’ set is reduced using the Cultural Clan-based optimization algorithm by removing the redundant and unimportant parameters that may mislead the classification. Finally, an ensemble learning algorithm “Random Forest” is used to train a model able to classify the fault based on the selected features. The proposed method was tested on a time-varying real dataset consisting of three different bearing health states: healthy, outer race defect, and inner race defect. The obtained results indicate the ability of our proposed method to handle the speed variability issue in bearing fault detection with high efficiencyItem Cancellous bone structure assessment using a new trabecular connectivity(Elsevier, 2021) Harrar, KhaledOsteoporosis is a major public health problem; it is characterized by a loss in bone connectivity, which leads to a higher risk of fracture. The objective of this article is to develop a new connectivity parameter for bone microarchitecture characterization and osteoporosis assessment. The purpose is to discriminate 164 subjects composed of 82 healthy patients (HL) and 82 osteoporotic cases (OP). The new connectivity parameter involves several new topological features. The proposed method was compared to a traditional connectivity index, and the results reveal the superiority and the outperformance of the new parameter to discriminate the two groups of subjects with an accuracy (Acc) of 71.95 % and area under curve (AUC) of 80.03 %. Moreover, clinical parameters from patients were involved in this study, and five configurations were constructed, tested, and validated on the data using the k-fold cross-validation (CV) model with several values of k. Furthermore, support vector machine (SVM) was used and various kernels (i.e., linear, quadratic, cubic, and RBF functions) were tested in this study. The objective is to look for the configuration providing the best performance in terms of separation between the two populations. Furthermore, several classifiers (logistic regression, k-nearest neighbors, boosted trees, and naïve Bayes) were tested and a combination of these classifiers was carried out using the stacking ensemble technique to improve the accuracy of the final prediction. Moreover, several studies of state-of-the-art were compared to the proposed method. The results obtained reveal that the 10-fold CV approach combining the new trabecular connectivity index and RBF function of SVM achieved the highest accuracy with Acc = 88.41 %, and AUC = 95.24 %. In addition, the proposed ensemble Meta classifier improved the accuracy of SVM and achieved a high rate with Acc = 95.12 % and AUC = 98.40 % outperforming the existing methods in the literatureItem L’Ecoconception : revue des outils disponibles et classification pour une meilleure intégration au sein des entreprises(2012) Cherifi, A.; Gardoni, M.; Froelich, D.; Tireche, S.; Kebbouche, Zahia; Tairi, A.