Publications
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Simulation-based coyote optimization algorithm to determine gains of PI controller for enhancing the performance of solar PV water-pumping system Ghent University
In this study, a simulation-based coyote optimization algorithm (COA) to identify the gains of PI to ameliorate the water-pumping system performance fed from the photovoltaic system is presented. The aim is to develop a stand-alone water-pumping system powered by solar energy, i.e., without the need of electric power from the utility grid. The voltage of the DC bus was adopted as a good candidate to guarantee the extraction of the maximum power ...
Simulation-based optimization of UGCs performances KU Leuven
A simulation-based technique is presented to improve performances characteristics of Unity-Gain Cells (UGCs), namely: Voltage and current followers, and voltage and current mirrors. The proposed technique is based on Monte Carlo simulations to find the optimum sizes of UGCs, by varying the bias current and by guaranteeing saturation conditions for all transistors under a tolerance specified by the user. The simulation technique classifies the ...
Condition Monitoring of Rolling Element Bearings based on Artificial Intelligence: from Kernel Methods to Simulation-based Transfer Learning KU Leuven
Rolling element bearings are commonly used in rotating machinery as critical components to transmit power and carry loads while boosting the relative motion between two structures. The condition of bearings plays a prominent role in machinery's overall health and thus has become the primary target in condition monitoring research. In recent years, Artificial Intelligence (AI) is quickly seeping into every corner of both the academic and ...
Simulation-based evaluation of the linear-mixed model in the presence of an increasing proportion of singletons Hasselt University KU Leuven University of Antwerp
Data in medical sciences often have a hierarchical structure with lower level units (e.g. children) nested in higher level units (e.g. departments). Several specific but frequently studied settings, mainly in longitudinal and family research, involve a large number of units that tend to be quite small, with units containing only one element referred to as singletons. Regardless of sparseness, hierarchical data should be analyzed with appropriate ...
Bridging the gap between measurement-based and simulation-based metamodels for deriving bulk optical properties from spatially-resolved reflectance profiles: effect of illumination and detection geometry KU Leuven
Non-invasive determination of the optical properties is essential for understanding the light propagation in biological tissues and developing optical techniques for quality detection. Simulation-based models provide flexibility in designing the search space, while measurement-based models can incorporate the unknown system responses. However, the interoperability between these two types of models is typically poor. In this research, the ...
An enhanced simulation-based iterated local search metaheuristic for gravity fed water distribution network design optimization University of Antwerp
The gravity fed water distribution network design (WDND) optimization problem consists in determining the pipe diameters of a water network such that hydraulic constraints are satisfied and the total cost is minimized. Traditionally, such design decisions are made on the basis of expert experience. When networks increase in size, however, rules of thumb will rarely lead to near optimal decisions. Over the past thirty years, a large number of ...
Simulation-based optimization method for retrofitting HVAC ductwork design University of Antwerp
Retrofitting the design of a ductwork system is often a critical aspect when renovating a centralized air distribution system. However, the existing approaches rely on the rules of thumb due to the absence of a standardized guideline for the design retrofitting process. Consequently, design engineers face costly and time-consuming challenges in generating retrofitted designs, particularly when dealing with the complexities of reusing the ...
An Image-based Musculoskeletal Modeling Platform For Simulation-based Evaluation Of Vertebral Motion In Adult Spinal Deformity KU Leuven
Adult Spinal Deformity (ASD) has been identified in 68 % of the population older than 60 years. It is caused by asymmetric degeneration of the spinal joints, inducing varying degrees of trunk deformity, with an impact on the quality of life even larger than arthritis, lung disease, diabetes and heart failure. Despite advances in instrumentation, diagnostic tools and surgical techniques, up to 70% of spinal deformity patients continue to suffer ...
Simulation-based study comparing multiple imputation methods for non-monotone missing ordinal data in longitudinal settings Hasselt University KU Leuven
The application of multiple imputation (MI) techniques as a preliminary step to handle missing values in data analysis is well established. The MI methods can be classified into two broad classes, the joint modeling and the fully conditional specification approaches. Their relative performance for longitudinal ordinal data setting is not well documented. This paper intends to ll this gap by conducting a large simulation study on the estimation ...