Browsing by Author "Zakariyya, O. S"

Now showing 1 - 11 of 11
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    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. M
    Following 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.
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    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. M
    Following 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.
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    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. M
    Home 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.
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    Evaluative Assessment of an X-band Microstrip Patch Antenna for Wireless Systems.
    (Published by College of Engineering Afe Babalola University, Ado-Ekiti (ABUAD), Ekiti State, Nigeria., 2018-07) Salami, A . F; Zakariyya, O. S; Sadiq, B. O; Abdulrahman, O. A
    Microstrip patch antennas (MPAs) are rapidly gaining more attention due to the proliferation of communication devices and systems with frequencies becoming more suitable for the size and performance of this type of antenna. Due to recent advancements in semiconductor technology, high dielectric constant materials are used to achieve additional size reduction which has made MPAs very useful and popular in the design of mobile devices and wireless systems. However, MPAs suffer from problems associated with narrow bandwidth and low gain. Techniques employed for improving the performance of MPA hinge on tweaking features such as the patch size, substrate height, ground plane size and feeding method. In view of this, this research designs and analyses the performance of an X-band MPA for wireless systems using CST Microwave Studio. Including the ground plane, the proposed design has a low-profile structure of 17 mm × 17 mm × 1.6 mm which is suitable for wireless systems. The proposed design also resonates at a frequency of 10 GHz with an omnidirectional radiation pattern exhibiting a gain of 7.2 dBi. Return Loss, VSWR, Gain and Radiation Pattern are the performance indicators employed in this research. The proposed MPA design demonstrates marked performance improvement when benchmarked with a similar MPA designed for 5G applications.
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    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. A
    This 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.
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    An Improved U-Slot Based 1 X 2 Triple Band Antenna Array for Flying Ad-hoc Networks (FANETs)
    (Faculty of Technology Education, Abubakar Tafawa Balewa University Bauchi, Nigeria, 2017-12) Sadiq, B. O; Zakariyya, O. S; Olayanju, S. A; Adedokun, A. E
    The objective of this paper is to design an improved U-Slot based 1 X 2 triple band antenna array for Flying Ad-hoc Networks (FANETs). The purpose of this modification is to increase the bandwidth and gain of the existing 1 X 2 triple band antenna array. This is because high bandwidth and gain are essential requirement for UAVs in FANET. However, to achieve this, the resonating frequency needed to be selected appropriately. The proposed antenna array resonates at 3.2GHz, 5.1GHz and 6.4GHz frequency band respectively. The antenna is optimized using a U-Slot resonating at triple-bands by introducing two symmetrical slits at the non-radiating edges of the patch. Simulation results were achieved using CST Studio and showed that the antenna has a bandwidth of 313MHz, 51MHz and 167MHz for the three bands respectively. This implies that practical applications can be achieved using this antenna.
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    Introduction to Electrical and Electronics Engineering Discipline. In Introduction to Engineering Discipline
    (Faculty of Engineering and Technology, University of Ilorin, Ilorin, Nigeria, 2019) Surajudeen-Bakinde, N. T; Abdulkarim, A; Akanni, J; Otuoze, A. O; Olayanju, S. A; Zakariyya, O. S
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    Investigative Analysis of Li-Fi Efficiency in 2d And 3d Image Transmission
    (Published by Federal University Wukari, Taraba State, 2018-10) Sadiq, B. O; Salawudeen, A. T; Abdullahi, H; Zakariyya, O. S; Abubakar, A. S
    The use of wireless and networked devices is rising exponentially, making the current radio frequency spectrum overcrowded. In view of this, this paper presents an investigative analysis of using Light Fidelity (Li-Fi) as an alternative to Wireless Fidelity (Wi-Fi) in 2-dimensional and 3-dimensional image transmission. A Li-Fi transmitter and receiver circuit diagram were developed and implemented for the purpose of the transmission. A program interface for the Li-Fi circuitry was implemented using MATLAB 2016b software. The conversion of the input image was achieved using the image processing toolbox in the MATLAB software. Therefore, it can be concluded that the channel provides high security due to the fact that light rays do not penetrate walls as well as the reasonable bandwidth required to carry both compressed and uncompressed images (2D/3D). Thus, making it suitable for image transmission.
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    MODELLING AND REALIZATION OF A COMPACT CPW TRANSMISSION LINE USING 3D MMICS TECHNOLOGY IN ADS MOMENTUM
    (published by IEEE Xplore, 2019-12-12) Bello, H; Oyeleke, O; Usman, A. D; Bello, T; Mohammad, I; Zakariyya, O. S
    The two dimensional monolithic microwave integrated circuits (2D MMIC) are mainly implemented in a planar fashion and use microstrip design based technology. At microwave frequency and above, they would require a large amount of passive circuitry therefore occupying a great deal of space (area). Furthermore the 2D MMIC is associated with some disadvantages ranging from the use of very thin substrate which makes it less reliable, to very delicate substrate due to the use of via-hole technology, coupling issue and high cost due to large area it occupies. To solve these problems a three-dimensional multilayer technique 3D MMIC was used. The design of the 3D MMIC is based on coplanar waveguide (CPW), in this design the signal is protected by the two grounds on both side, the circuit becomes more compact, cost-effective and with improved performance. This research work was aimed at the design, modelling and investigation of a GaAs based multilayer compact 3D MMIC transmission line. Different transmission lines were designed and modelled using Agilent’s Advanced Design System (ADS) and their Sparameters were extracted using Electromagnetic (EM) simulator momentum
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    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. A
    This 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.
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    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. S
    Replacing 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.