Dhafar Hamed Abd

Dhafar Hamed Abd

*This is an algorithmically generated author record based on publicly available information.

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Dhafar Hamed Abd has a total of 43 co-authors. Here are the top co-authors by number of shared publications:


Latest Publications

  • Open Access

    A Weighted-Distance Ensemble Learning Method for Arabic Fake News Detection

    by Dhafar Hamed Abd, Mohammed Fadhil Mahdi, Luke K. Topham, Wasiq Khan, Sam Ansari, Abir Hussain

    In the digital era, the rapid proliferation of fake news poses critical challenges to information credibility and public trust, particularly in Arabic news ecosystems where linguistic complexity and limited annotated resources exacerbate detection difficulties. This study proposes a framework for Arabic fake news detection based on a weighted-distance ensemble learning method (WDELM). The WDELM framework combines posterior-probability estimates from six heterogeneous base classifiers: extreme gradient boosting (XGBoost), LightGBM (LGBM), random forest (RF), adaptive boosting (AdaBoost), gradient boosting (GB), and logistic regression (LR). The classifier outputs are integrated through a distance-aware adaptive weighting strategy based on cosine distance in the prediction space. Unlike conventional ensemble techniques, the proposed framework employs normalised distance-aware adaptive weighting to adapt classifier contributions while preserving the probabilistic interpretation of the final ensemble output. Experiments were conducted on an Arabic fake news dataset comprising 2538 manually annotated instances. The model was evaluated using multiple performance metrics, including precision, recall, F1-score, Cohen’s kappa, ROC-AUC, and accuracy, together with explainability analyses. Using stratified ten-fold cross-validation, the proposed WDELM achieved a mean accuracy of 92.120±1.097% and a mean ROC-AUC of 97.125±0.686%. Analysis of the concatenated predictions generated across the ten outer-validation folds yielded an F1-score of 91.357% for the Fake class, an F1-score of 92.759% for the Real class, and a pooled macro-F1 score of 92.058%, indicating balanced classification performance across both classes. The results indicate that the proposed weighted-distance ensemble strategy provides improved empirical performance within the evaluated dataset and offers a transparent mechanism for combining heterogeneous classifiers. The framework is further assessed through statistical validation, error analysis, and explainability analysis, supporting its potential use as an auxiliary decision-support tool for Arabic fake news screening rather than as a fully automated replacement for professional fact-checking.

  • XBNet and text mining-based genetic diseases classification

    by Dhafar Hamed Abd, Mustafa Abdalrassual Jassim, Mohamed Nazih Omri, Wasiq Khan, Abir Hussain

  • Arabic Fake News Detection Techniques: A Review

    by Maysoon Ahmed Abbas, Dhafar Hamed Abd, Mondher Frikha, Adel M. Alimi

    American scientific publishing group

  • Open Access

    Autonomous vehicles with augmented reality internet of things and edge intelligence system for industry 5.0 based on 6G

    by Amjed A. Ahmed, Aqeel Kamil Kadhim, Mohammad Kamrul Hasan, Sumaia M. Al-Ghuribi, Dhafar Hamed Abd, Salah A. Aliesawi, Belal Abdullah Hezam Murshed, Luke Topham, Wasiq Khan, Abir Jaafar Hussain

    In an era of rapidly evolving technology, traditional cloud computing struggles to meet the demands of resource-intensive smart devices. This necessitates a shift towards Edge Computing (EC), which brings computation and data storage closer to the network’s edge, enhancing efficiency and reducing latency. This is particularly crucial for the Internet of Things (IoT), where supporting mobility, location awareness, and real-time processing are paramount. However, the scalability of EC applications is significantly influenced by network parameters and the capabilities of the computing system. This paper proposes a novel system architecture for Industry 5.0 that leverages the synergy between 6G networks, autonomous vehicles, Augmented Reality (AR), IoT, and edge intelligence to revolutionize transportation systems. Our approach integrates AR for enhanced user interfaces, utilizes IoT for data acquisition and control, and employs edge computing for real-time decision-making. Our experimental results demonstrate a strong correlation between processing speed and network bandwidth. While increasing either parameter individually enhances overall system performance. The two-tier architecture, combined with the Entity Objects (EO) model, demonstrates superior scalability compared to traditional approaches. By distributing processing tasks and leveraging the resources of other edge servers, the system can handle increasing numbers of AVs and data loads without compromising performance.


  • Open Access

    Fuzzy evaluation and explainable machine learning for diagnosis of rheumatic and autoimmune diseases

    by Mohammed Fadhil Mahdi, Arezoo Jahani, Dhafar Hamed Abd

    In this article, a new combination of an explainable machine learning approach with a fuzzy evaluation framework is proposed to improve the diagnostic performance and interpretation of rheumatic and autoimmune diseases. This work addresses three major challenges: (i) overlapping symptoms and complex clinical presentations, (ii) the lack of interpretability in traditional machine learning models, and (iii) the difficulty of selecting the best diagnosis model. To overcome these challenges, a new dataset was collected from Iraq’s hospitals and health centers between 2019 and 2024. The size of dataset is 12,085 patients and includes 14 features in seven classes (rheumatoid arthritis, reactive arthritis, ankylosing spondylitis, Sjogren syndrome, systemic lupus erythematosus, psoriatic arthritis, and normal). The dataset is subjected to extensive preprocessing with attribute imputation (mean and mode), encoding categorical features, and balancing the data to pass it to 12 different machine learning models. Performance is evaluated based on precision, recall, F-score, kappa, Hamming loss, Matthews correlation coefficient, and accuracy to identify the best model. To select the optimal model, we apply fuzzy decision by opinion score method (FDOSM). The FDOSM process involves assessments from three domain experts to ensure a robust and well-rounded evaluation. Furthermore, the explainable artificial intelligence (XAI) technique provides global and local explanations for model predictions. Local interpretable model explanations (LIME) were used as explanations and significantly increased the transparency and reliability of the clinical decision-making process. The results show that the FDOSM yields gradient boosting with a 0.1333 score and a rank of 1, is the best model with an accuracy of 86.89%, precision of 87.35%, and kappa of 84.51%. The best model using XAI to increase confidence and trustworthiness in clinical decision-making and healthcare applications.


  • Open Access

    Diagnosis of rheumatic and autoimmune diseases dataset

    by Mohammed Fadhil Mahdi, Arezoo Jahani, Dhafar Hamed Abd


  • Open Access

    Predicting early mortality for patients in intensive care units using machine learning and FDOSM

    by Kareem Hameed Khalaf, Abdolhamid Moallemi Khiavi, Dhafar Hamed Abd

    An accurate prediction of mortality in intensive care units (ICUs) is crucial to improving patient outcomes and optimizing resource allocation. However, existing methods often lack high-dimensional data and interpretability, rely on outdated equipment, or fail to integrate multifaceted clinical data effectively. This study aims to develop a hybrid predictive model integrating machine learning (ML), the fuzzy decision-by-opinion score method (FDOSM), and explainable artificial intelligence (XAI) to enhance the accuracy, transparency, and clinical applicability of the prediction of mortality forecasts. The dataset was used from Zigong Fourth People’s Hospital and consisted of 1,210 patients and 182 attributes. Using Chi-square feature selection, we identified statistically significant features (e.g. vital signs, lab results) from ICU patient records, reducing dimensionality while preserving predictive power. We evaluated multiple ML models (including LightGBM, Extra Trees, Support Vector Machine, K -Nearest Neighbours, XGBoost, Random Forest, and Artificial Neural Network) using a comprehensive dataset of ICU patient records, which includes vital signs, laboratory results, and clinical interventions. The FDOSM was then integrated to assess model outputs against domain-specific criteria, enabling nuanced risk stratification and enhancing decision support in critical care. XAI techniques were used to interpret the outputs of the best-performing model, improving trust in the predictions. Our hybrid approach achieved superior performance, with the Extra Tree algorithm trained on the refined feature set obtaining the highest rank 1, with a weight of 0.14375, an AUC of 88.173%, a precision of 90.244%, and an accuracy of 88.167%. The results demonstrate that combining Chi-square-driven feature selection with ML-FDOSM and XAI integration significantly improves mortality prediction, offering a reliable and transparent tool for critical care settings.

  • Open Access

    Comorbidity diagnosis using machine learning: Fuzzy decision-making approach

    by Dheyauldeen M. Mukhlif, Dhafar Hamed Abd, Ridha Ejbali, Adel M. Alimi, Mohammed Fadhil Mahdi, Abir Jaafar Hussain

    Comorbidity, the simultaneous existence of multiple medical conditions in a patient, is a major challenge in healthcare. Comorbidity is highly threatening for healthcare systems, which requires innovative solutions over traditional methods. The medical field is challenged by accurately diagnosing these intertwined diseases of coexisting ailments and anticipating their rise. The current diagnostic approaches are time-consuming and inaccurate, hinder effective treatment, and delay accurate results for the patient. Artificial intelligence can provide an effective method for early prediction of comorbidity risks. In this study, various artificial intelligence models are used, and a clinical dataset of 271 patients is utilized to diagnose comorbidity. In which a hybrid diagnosis model is proposed based on the intersection between machine learning (ML) and feature selection techniques for the detection of comorbidity. Fuzzy decision by opinion score method is utilized as a sophisticated tool to select the most representative ML for prediction. Extensive simulation results showed an accuracy rate of 91.463 using AdaBoost ML. Furthermore, utilizing the fuzzy decision by opinion score technique, we were able to confirm that the best model using all features as well as the chi square and KBest features is the AdaBoost, which scored the smallest value of 0.204 and hence confirm that it is the best selected ML model for comorbidity.