Browsing by Author "Usman, A. M"
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Item Assessment of Quality of Service of G.S.M. Networks in Ilorin Metropolis, Nigeria.(Afe Babalola University, Ado-Ekiti, Nigeria., 2020-06-30) Surajudeen-Bakinde, N. T; Adeniji, K. A; Oyeleye, S. O; Zakariyya, O. S; Olayanju, S. A; Usman, A. MFollowing the rollout of GSM services across Nigeria, the socio-economic landscape of the country has been positively altered. Its explosive growth has brought huge revenues to the operators, as well as the government and at the same time benefited the citizens in many ways. However, the principal developmental factors that has continued to mar these benefits is the aggressive complaints from GSM subscribers regarding the horrible Quality of Service (QoS) rendered by the GSM operators across the country. As the number of subscribers of GSM in Nigeria increased, congestion rates also increased and there has been a huge demand for a decent QoS in the country. In this study, three key performance indicators (KPI) parameters, call setup success rate (CSSR), received signal level (RSL) and call drop rate (CDR) were used in assessing the performance of two of the major GSM networks in Ilorin Metropolis of Nigeria, which have been tagged Network “A” and Network “B”. A and B monitored are far from providing reliable services to Nigerians. None of the networks in the study met the ≥ 98% CSSR required by the N.C.C. regulations, and none met the ≤ 2% CDR required by the N.C.C. regulations. The problems GSM operation encountered have been attributed to a number of challenges, with cited faults ranging from the Network providers, to regulatory agencies, and even to the Nigerian Government.Item Assessment of Quality of Service of GSM Networks in Ilorin Metropolis, Nigeria(Published by College of Engineering Afe Babalola University, Ado-Ekiti (ABUAD), Ekiti State, Nigeria., 2020-06-30) Surajudeen-Bakinde, N. T; Adeniji, K. A; Oyeyele, S. O; Zakariyya, O. S; Olayanju, S. A; Usman, A. MFollowing the rollout of GSM services across Nigeria, the socio-economic landscape of the country has been positively altered. Its explosive growth has brought huge revenues to the operators, as well as the government and at the same time benefited the citizens in many ways. However, the principal developmental factors that has continued to mar these benefits is the aggressive complaints from GSM subscribers regarding the horrible Quality of Service (QoS) rendered by the GSM operators across the country. As the number of subscribers of GSM in Nigeria increased, congestion rates also increased and there has been a huge demand for a decent QoS in the country. In this study, three key performance indicators (KPI) parameters, call setup success rate (CSSR), received signal level (RSL) and call drop rate (CDR) were used in assessing the performance of two of the major GSM networks in Ilorin Metropolis of Nigeria, which have been tagged Network “A” and Network “B”. A and B monitored are far from providing reliable services to Nigerians. None of the networks in the study met the ≥ 98% CSSR required by the N.C.C. regulations, and none met the ≤ 2% CDR required by the N.C.C. regulations. The problems GSM operation encountered have been attributed to a number of challenges, with cited faults ranging from the Network providers, to regulatory agencies, and even to the Nigerian Government.Item The challenges and panaceas to power distribution losses in Nigeria(Faculty of Engineering, University of Maiduguri, Maiduguri, Nigeria., 2020-03) Mohammed, O. O.; Otuoze, A. O; Salisu, S; Abioye, A. E; Usman, A. M; Alao, R. AEnergy losses in the distribution network and its subsystems have been issues of great concerns in Nigeria’s power sector. For decades, several studies have been conducted on the challenges facing the power sector in Nigeria with most focus directed on the distribution subsystems. The major challenge in the distribution system is the high energy losses which are detrimental to the techno-economic benefits of the power systems. However, details of the distribution system challenges and the probable solutions have not been efficiently presented. In this study, some of these challenges are presented and the potential solutions are proposed. The features of the Nigeria distribution network, the technical and non-technical sources of losses as well as the identified challenges are presented before discussing the potential solutions. The panaceas so provided were from the understanding of some published works and other related materials as well as the in-depth understanding of the authors. This article can serve as a guide for the utilities and stakeholders in the power sector for efficient management operations and improved customer service delivery.Item Design of a Bimodal Home Automation System using ESP8266 and ATMEGA328 Microcontroller(Published by Department of Computer Engineering, Universitas Sriwijaya (Indonesia), 2017-10) Zakariyya, O . S; Salami, A. F; Alabi, O. O; Usman, A. MHome automation systems are garnering increasing popularity and widespread use due to the relative ease of domestic management and comparatively high return on technology investment tied to its adoption. However, Nigeria and other emerging ICT economies are yet to fully actualize and maximize the inherent potential of these smart home technologies due to endemic challenges associated with poor infrastructure, erratic power supply and unreliable Internet connectivity. These challenges necessitate an innovative paradigmatic shift that could provide a pragmatic technological solution suitable to the context of Nigeria and other developing climes. For most smart home systems in this research context, the status quo is based on choosing whether the design would be for short- or long-range communication network. Short-range designs which are usually realized with Bluetooth technology suffer from limited range issues while poor connectivity, bandwidth and latency issues are some of the problems plaguing Wi-Fi-based long-range designs. Consequently, this research presents a hybrid adaptive architecture that combines desirable features of both short- and long-range modes. The proposed smart home system is based on using embedded systems which use mobile application to send messages to ESP8266 Wi-Fi module. Together with notifications received from the monitoring unit, these messages are parsed by Arduino's ATMEGA328 microcontroller from where instruction codes are sent for controlling the load by switching ON or OFF various relays connected to the load.Item Design of a Bimodal Home Automation System using ESP8266 and ATMEGA328 Microcontroller.(Department of Computer Engineering, Universitas Sriwijaya, Indonesia, 2017) Zakariyya, O. S; Salami, A. F; Alabi, A. O; Usman, A. MHome automation systems are garnering increasing popularity and widespread use due to the relative ease of domestic management and comparatively high return on technology investment tied to its adoption. However, Nigeria and other emerging ICT economies are yet to fully actualize and maximize the inherent potential of these smart home technologies due to endemic challenges associated with poor infrastructure, erratic power supply and unreliable Internet connectivity. These challenges necessitate an innovative paradigmatic shift that could provide a pragmatic technological solution suitable to the context of Nigeria and other developing climes. For most smart home systems in this research context, the status quo is based on choosing whether the design would be for short- or long-range communication network. Short-range designs which are usually realized with Bluetooth technology suffer from limited range issues while poor connectivity, bandwidth and latency issues are some of the problems plaguing Wi-Fi-based long-range designs. Consequently, this research presents a hybrid adaptive architecture that combines desirable features of both short- and long-range modes. The proposed smart home system is based on using embedded systems which use mobile application to send messages to ESP8266 Wi-Fi module. Together with notifications received from the monitoring unit, these messages are parsed by Arduino's ATMEGA328 microcontroller from where instruction codes are sent for controlling the load by switching ON or OFF various relays connected to the load.Item Electrical Network Reliability and Failure Projection with increase in installations: Case Study, University of Ilorin, Nigeria.(Faculty of Engineering, University of Ilorin., 2011-07-06) Abdulkarim, A; Amuda, S.A.Y; Usman, A. MReliability is a key aspect of power system design and planning. In this research we present a reliability assessment of University of Ilorin electricity network. The focus of this paper is to analyse the contributory effect of electrical installations, majorly domestic and some industrial loads on the reliability of electrical network. This work use data of electrical failure cases from the University of Ilorin community, and categorized the failure reports based on their failure type. It also, gives an insight on how to project the system reliability effect for any consequent electrical faults or unplanned installation. The study here evaluated the reliability over a time period of about two years. The reliability indices for load points and the overall system were obtained using exponential distributed model.Item Field Loss Calculation of a Wind-powered Axial Flux Alternator by Analytical Equations.(Wiley Online Library, 2021-02) Otuoze, A. O; Mohammed, O. O; Ibrahim, O; Emmanuel, A. A; Usman, A. M; Dobi, A. MVarious techniques have been investigated and proposed for core loss minimization in electrical machines. Nevertheless, many of such methods are mostly complicated and not suitable for consideration at a preliminary design stage. In this work, a simplified procedure which uses an analytical approach to minimizing the field’s losses of an Axial Flux Permanent Magnet Alternator (AFPMA), is presented. First, the output equation of an AFPMA is referred, and then the minimization of the losses is investigated by analytical differential equations. The result of the derived-specific magnetic loading is investigated using three different core materials, namely 35RM300, 50JN350, and 65JN800, and is found to reduce with increased frequencies. The 35RM300 core material gives the maximum specific magnetic loading and minimum power loss at investigated frequencies of 50 to 500 Hz. Although the 35RM300 core material gives the best performance, the optimal values are only determined as suitable by the manufacturer’s design criteria. This study is a key indicator for a simple and efficient core material selection in the design of a Wind-Powered AFPMA without the need for complicated analyses at the preliminary design stage.Item A High Gain Patch Antenna Array for 5g Communication(published by IEEE Xplore, 2019-10-17) Zakariyya, O . S; Sadiq, B. O; Adebayo, M. A; Salami, A. F; Usman, A. M; Afolayan, M. AThis research proposed a 1X4 patch antenna array for 5G Communication. The proposed antenna was designed to resonate at 28GHz frequency band. CST Microwave studio was used for the simulation of the antenna by employing Roger RT 5880 LZ with thickness and permittivity 0.762mm and 1.96 respectively as the substrate. The antenna was fed using a quarter-wave transformer to match its impedance to 50 ohms. The single patch resonates at 27.9GHz frequency with; a bandwidth of 1.87GHz, and a gain of 7.79dB. The addition of another element brought about an increment in the above-mentioned values. Furthermore, the implementation of the four element array configuration brought about the significant enhancement of values for bandwidth and antenna gain with maximum achievable gain of 13.5 dB. The design procedure, structure and simulation of the antenna are discussed in this paper.Item A High Gain Patch Antenna Array for 5G Communication.(Institute of Electrical and Electronics Engineers (IEEE)., 2019-10) Zakariyya, O. S; Sadiq, B. O; Adebayo, M. A; Salami, A. F; Usman, A. M; Afolayan, M. AThis research proposed a 1X4 patch antenna array for 5G Communication. The proposed antenna was designed to resonate at 28GHz frequency band. CST Microwave studio was used for the simulation of the antenna by employing Roger RT 5880 LZ with thickness and permittivity 0.762mm and 1.96 respectively as the substrate. The antenna was fed using a quarter-wave transformer to match its impedance to 50 ohms. The single patch resonates at 27.9GHz frequency with; a bandwidth of 1.87GHz, and a gain of 7.79dB. The addition of another element brought about an increment in the above-mentioned values. Furthermore, the implementation of the four element array configuration brought about the significant enhancement of values for bandwidth and antenna gain with maximum achievable gain of 13.5 dB. The design procedure, structure and simulation of the antenna are discussed in this paper.Item A particle Swarm Optimization Based Edge Detection Algorithm for Noisy Coloured Images(Indian Academicians and Researchers Association, Indian, 2016-12) Sadiq, B. O; Zakariyya, O. S; Abdulrahman, O. A; Usman, A. M; Alao, R. AThis paper presents an improved edge detection algorithm using particle swarm optimization (PSO) based on vector order statistics. The proposed algorithm was implemented using MATLAB 2013 script. The algorithm addressed the performance of edge detection in noisy coloured images, with a view to minimizing broken, false and thick edges whilst reducing the presence of noise. A collection scheme based on step and ramp edges was applied to the edge detection algorithm, which explores a larger area in the images in order to reduce false and broken edges. The efficiency of this algorithm was tested on two Berkeley benchmark images in noisy environments with a view to comparing results both visually and quantitatively with those obtained using proven edge detection algorithms such as the Sobel, Prewitt, Roberts, Cannyand Laplacian edge detection algorithms. The Pratt Figure of Merit (PFOM) was used as a quantitative comparison between the proposed algorithm and the proven edge detection algorithms. The PFOM on the test images in noisy environment for the Sobel, Prewitt, Roberts, Laplacian, Canny and the proposed edge detection algorithms are 0.4191, 0.4191, 0.2807, 0.2811, 0.5606 and 0.8458 respectively. This showed that the developed algorithm will perform better than the existing edge detection algorithm in multimedia systems.Item Replacement Model for Street Lighting Systems(Faculty of Engineering, University of Nigeria, Nsukka, Nigeria, 2021-01) Usman, A. M; Adediran, Y. A; Otuoze, A. O; Mohammed, O. O; Zakariyya, O. SReplacing failed bulbs of streetlights in a location can be very tasking and expensive if the optimal time for replacement is not determined. In this paper, a model has been developed that helps to establish the optimal time for the replacement of streetlight bulbs. Burnt-out bulbs are replaced individually when they fail, and group replacement is carried out on all bulbs after a specified time. The costs for both individual replacement and group replacement are determined. The developed model was applied to locally sourced data from a field survey of a streetlight installation at the University of Ilorin, Ilorin, North-central Nigeria. The model gave the optimum replacement time of burnt-out bulbs as the eighteenth week when applied to the data used in this work. The optimum replacement time will be dependent on the dataset used. This makes the developed model useful in establishing the optimal replacement time of any stochastically failing items that are in large quantities. The model will help to reduce maintenance costs for facility managers.Item Review of Automatic Detection and Classification Techniques for Cetacean Vocalization(Institute of Electrical and Electronics Engineers (IEEE)., 2020-06-08) Usman, A. M; Ogundile, O. O; Versfeld, D. J. JCetaceans have elicited the attention of researchers in recent decades due to their importance to the ecosystem and their economic values. They use sound for communication, echolocation and other social activities. Their sounds are highly non-stationary, transitory and range from short to long sounds. Passive acoustic monitoring (PAM) is a popular method used for monitoring cetaceans in their ecosystems. The volumes of data accumulated using PAM are usually big, so they are difficult to analyze using manual inspection. Therefore different techniques with mixed outcomes have been developed for the automatic detection and classification of signals of different cetacean species. So far, no single technique developed is perfect to detect and classify the vocalizations of over 82 known species due to variability in time-frequency, difference in the amplitude among species and within species' vocal repertoire, physical environment, among others. The accuracy of any detector or classifier depends on the technique adopted as well as the nature of the signal to be analyzed. In this article, we review the existing techniques for the automatic detection and classification of cetacean vocalizations. We categorize the surveyed techniques, while emphasizing the advantages and disadvantages of these techniques. The article suggests possible research directions that can improve existing detection and classification techniques. In addition, the article recommends other suitable techniques that can be used to analyze non-linear and non-stationary signals such as the cetaceans' signals. Several research have been dedicated to this topic, however, there is no review of these past results that gives a quick overview in the area of cetacean detection and classification. This review will help researchers and practitioners in the field to make insightful decisions based on their requirements.