Work place: Department of Electrical and Computer Engineering, Anderson University, Anderson, SC 29621, USA
Research Interests: Systems Architecture, Computational Learning Theory, Computer systems and computational processes, Wireless Networks, Computer Networks
Dr. Stephen Ojo (Member, IEEE) is a lecturer in the Department of Electrical and Computer Engineering, College of Engineering, Anderson University, Anderson, South Carolina, United States of America. He received B.Eng (Honours) in Electrical and Electronics Engineering from the Federal University of Technology Akure Nigeria in 2014, M.Sc in Electrical and Electronics Engineering from Girne American University, Cyprus in 2018 and PhD in Information Systems in May 2021 from the same University. Before Joining Anderson University, he was a Lecturer at Girne American University Cyprus, where he taught courses in distributed computing, advanced programming and Electric Circuits. Dr. Ojo also worked as a research scholar in Vodafone Telecommunication Company Cyprus, where he developed a multiplicative based model for signal propagation in wireless networks. Dr. Ojo was awarded a Mobil scholarship throughout his undergraduate program and a full PhD scholarship. Dr. Ojo is presently a full-time faculty at Anderson University, the USA, where he teaches courses in computer programming, electric circuits, machine learning and artificial intelligence in biomedical applications. He is presently a member of the committee on the graduate certificate program on ML/AI at the college of Engineering. He is also a member of the curriculum development committee and a member of the faculty search committee. He has authored and co-authored over ten peer-reviewed journals. His research interests are in wireless networks, machine learning and AI in biomedical devices, and systems modelling. He is presently a member of the committee on AI/ML-enabled advancement in personalized biomedical devices in the State of South Carolina, USA.
DOI: https://doi.org/10.5815/ijigsp.2023.05.01, Pub. Date: 8 Oct. 2023
Denoising is a vital aspect of image preprocessing, often explored to eliminate noise in an image to restore its proper characteristic formation and clarity. Unfortunately, noise often degrades the quality of valuable images, making them meaningless for practical applications. Several methods have been deployed to address this problem, but the quality of the recovered images still requires enhancement for efficient applications in practice. In this paper, a wavelet-based universal thresholding technique that possesses the capacity to optimally denoise highly degraded noisy images with both uniform and non-uniform variations in illumination and contrast is proposed. The proposed method, herein referred to as the modified wavelet-based universal thresholding (MWUT), compared to three state-of-the-art denoising techniques, was employed to denoise five noisy images. In order to appraise the qualities of the images obtained, seven performance indicators comprising the Root Mean Square Error (RMSE), Mean Absolute Error (MAE), Structural Content (SC), Peak Signal to Noise Ratio (PSNR), Structural Similarity Index Method (SSIM), Signal-to-Reconstruction-Error Ratio (SRER), Blind Spatial Quality Evaluator (NIQE), and Blind/Referenceless Image Spatial Quality Evaluator (BRISQUE) were employed. The first five indicators – RMSE, MAE, SC, PSNR, SSIM, and SRER- are reference indicators, while the remaining two – NIQE and BRISQUE- are referenceless. For the superior performance of the proposed wavelet threshold algorithm, the SC, PSNR, SSIM, and SRER must be higher, while lower values of NIQE, BRISQUE, RMSE, and MAE are preferred. A higher and better value of PSNR, SSIM, and SRER in the final results shows the superior performance of our proposed MWUT denoising technique over the preliminaries. Lower NIQE, BRISQUE, RMSE, and MAE values also indicate higher and better image quality results using the proposed modified wavelet-based universal thresholding technique over the existing schemes. The modified wavelet-based universal thresholding technique would find practical applications in digital image processing and enhancement.[...] Read more.
DOI: https://doi.org/10.5815/ijigsp.2022.04.04, Pub. Date: 8 Aug. 2022
Failure modeling is an essential component of reliability engineering. Enhanced failure rate modeling techniques are vital to the effective development of predictive and analytical methodologies, demonstration of the engineering procedure, allocation of procedures, design, and control of procedures. However, failure rate modeling has not been given adequate treatment in the literature. The need to investigate failure rate modeling leveraging cutting-edge techniques cannot be overemphasized. This paper proposed and applied a joint support vector regression (SVR) and wavelet transform (WT) approach termed (WT-SVR) to training and learning the call failures rate in wireless system networks. The wavelet transform has been accomplished using the wavelet compression sensing technique. In this technique, the standardized call failure rate data first go through a wavelet filtering transformation matrix. This is followed by separating and outputting the transformed filtered components in the compression phase. Finally, the transformed filtered output components were trained and evaluated using the SVR based on statistical learning theory. The resultant outcome revealed that the proposed WT-SVR learning method is by far better than using only the SVR method for call rate prognostic analysis. As a case in point, the WT-SVR attained STD values of 0.12, 0.21, 2.32, 0.22, 0.90, 0.81 and 0.34 on call failure data estimation compared to the basic SVR that attained higher STD values of 0.45, 0.98, 0.99, 0.46, 1.44, 2.32 and 3.22, respectively.[...] Read more.
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