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Ensemble-based model selection for imbalanced data to investigate the contributing factors to multiple fatality road crashes in Ghana
(University of Nairobi, 2021-03)
The study aims to identify relevant variables to improve the prediction performance of the crash injury severity (CIS) classification model. Unfortunately, the CIS database is invariably characterized by the class imbalance. ...
Performance Characterization of 64-APSK Mapping Schemes for Uncoded Space-Time Labeling Diversity in Rician Fading Channels.
(Institute of Electrical and Electronics Engineers, 2021)
This paper investigates design of spectrally efficient nonlinear transmission scheme for uncoded space-time labeling diversity that is compatible with DVB-S2X standard. Designs are presented for 64-APSK constellation by ...
The Optimization of the Surface Roughness of Milled Polypropylene + 60wt.% Quarry Dust Composite Using the Taguchi Technique
(University of Nairobi, 2021)
This study is based on the optimization of the parameters that influence the computer numerical control (CNC) milling operation during the machining of polypropylene+60wt.% quarry dust composite. The input parameters studied ...
Effects of Friction Stir Welding on Microstructure and Mechanical Properties of Extruded Secondary Aluminum 6061 Alloy
(University of Nairobi, 2021)
Experiments were carried out to determine the effects of friction stir welding on microstructure and properties of recycled Aluminum 6061 alloy, whose alloy content varied from that of primary alloy. The alloy was processed ...