Browsing by Author "Ahishakiye, Emmanuel"

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Deep learning based constraint aware design exploration of triply periodic minimal surface bone scaffolds
(Discov Mechanical Engineering, 2026-04-27) Bwengye, Innocent; Ahishakiye, Emmanuel; Wasswa, William; Obungoloch, Johnes
Bone tissue engineering scaffolds must provide structural support while permitting fluid transport and maintaining safe hydrodynamic conditions for cell activity. Triply Periodic Minimal Surface (TPMS) architectures such as Gyroid, Schwarz-P, and Diamond offer continuous curvature and tunable porosity, yet identifying configurations that simultaneously satisfy mechanical, transport, and manufacturability requirements remains computationally expensive. This study presents a constraint-aware computational framework for rapid exploration of TPMS scaffold design spaces by combining procedural geometry generation, analytical physics-consistent property estimation, and a geometry-aware deep learning surrogate model. A dataset of 1000 voxelized scaffolds (porosity 0.55–0.80; unit-cell size 0.8–1.2 mm) was used to train a multitask 3D convolutional neural network to approximate apparent modulus, permeability, effective diffusivity, and shear-exposure indicators derived from established mechanistic relations. The surrogate achieved a mean absolute error of approximately 3.9 GPa for predicted stiffness and reproduced transport trends on the order of 10−11 m2/s, enabling screening of more than 3000 candidate geometries without performing high-fidelity simulations. Pareto analysis revealed strong stiffness–transport trade-offs across TPMS families. Manufacturability constraints, particularly a minimum printable wall thickness of approximately 0.30 mm, eliminated many high-porosity designs. A near-feasible Schwarz-P configuration (ϕ ≈ 0.86, a ≈ 2.6 mm) exhibited moderate predicted stiffness (~ 2.1–2.5 GPa after thickness adjustment), effective diffusivity ≈3 × 10−11 m2/s, and permeability on the order of 10−10 m2, illustrating the competing requirements of structural support and perfusion. The proposed framework functions as a geometry-aware design-screening and prioritization tool that identifies candidate scaffold configurations prior to detailed finite-element, computational-fluid-dynamics, or experimental validation. The work provides a reproducible approach for accelerating early-stage scaffold design exploration and guiding subsequent biomechanical evaluation. Similar content being viewed by others
Prediction of cervical cancer basing on risk factors using ensemble learning
(IEEE, 2020-05-22) Ahishakiye, Emmanuel; Wario, Ruth; Mwangi, Waweru; Taremwa, Danison
Cervical cancer is among the most common types of cancer affecting women around the world despite the advances in prevention, screening, diagnosis, and treatment during the past decade. Cervical cancer can be treated if diagnosed in its early stages. Machine learning algorithms like multi-layer perceptron, decision trees, random forest, K-Nearest Neighbor, and Naïve-Bayes have been used for the prediction of cervical cancer to aid in its early diagnoses. In this study, we used an ensemble learning technique in the prediction of cervical cancer using risk factors. This technique was selected because it combines several machine learning techniques into one model to decrease variance, bias, and improvement in performance. K-Nearest Neighbor, Classification and Regression Trees, Naïve Bayes Classifier, and Support Vector Machine. Classification methods were selected because the interest of this study was to solve a classification problem. Therefore these algorithms could work well within our problem domain. The final prediction model was trained and validated, and our experimental results revealed that our model had an accuracy of 87.21%.
Prediction of delayed postgraduate graduation using machine learning in Ugandan higher education
(Discover Artificial Intelligence, 2026-08-22) Musoke, Robert Lubelenga; Nameere, Kivunike Florence; Chongomweru, Halimu; Ahishakiye, Emmanuel
Delayed postgraduate graduation is a major challenge to higher education institutions in Uganda in terms of student progression, institutional planning and human capital development. Identifying students at risk of delayed completion early can inform timely academic interventions and improve post-graduate outcomes. This study developed and compared machine learning models for delayed postgraduate graduation prediction using institutional administrative records from Makerere University. A retrospective predictive modelling study was performed using anonymised data from 500 postgraduate students registered from 2017 to 2023. 29% of them graduated on time and 71% graduated late. We developed and evaluated a number of supervised machine learning classifiers such as Random Forest, XGBoost, K-Nearest Neighbours, Logistic Regression and a stacking ensemble model. The model performance was evaluated using accuracy, precision, recall, F1-score and ROC-AUC. All trained models were found to have high and similar predictive performance in terms of accuracy (between ~ 94% and 95%) and ROC-AUC (between 0.94 and 0.95). Logistic Regression gave the numerically highest ROC-AUC (0.950) although differences in classifier performance were not statistically meaningful. Employment status and age at admission were positively related to delayed graduation whereas higher undergraduate CGPA decreased the likelihood of delayed completion. The results indicate that interpretable machine learning models can match the performance of complex ensemble methods on structured educational datasets. Apart from predictive performance, the study offers context-specific evidence on the use of predictive analytics in postgraduate education in Uganda, which is often characterised by patterns of progression affected by research-intensive study requirements, employment responsibilities, and long thesis completion processes. The proposed framework can assist in early identification of at-risk postgraduate students and directing institutional interventions in order to improve graduation outcomes.