Browsing by Author "Thomas, Cornelius"

Now showing 1 - 7 of 7
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    Assessment of Internet service Provider using UMTS Operators at the University of Ilorin Main campus
    (Faculty of Engineering, University of Nigeria, Nsukka, Nigeria, 2020) Akanni, Jimoh; Abdurrhaman, Isa; Alao, Rasaq; Thomas, Cornelius
    Over the years the need for mobile broadband had seen a great increment due to the demand of internet mobile users. In this research work, data size for Internet operation on UMTS mobile network operators on the University of Ilorin Campus was assessed. The study assessed three UMTS network operators using an Infinix T627 android smart phone and RantCell App. to measure the download and upload at the selected points on the University of Ilorin Campus. It was observed that the number of active subscribers with their relative position in a cell have a great effect on the performance of the networks and therefore, the authors recommend the need for the operators to improve their data sizes so as to enhance users’ satisfaction.
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    A control model of the operating head dynamics of Jebba hydropower system
    (Federal University of Technology, Minna, Niger Sate, Nigeria, 2019) Akanni, Jimoh; Ogunbiyi, Olalekan; Thomas, Cornelius; Omeiza, Issac; Olufeagba, Benjamin
    Electricity availability in Nigeria has been very poor over the years, underscoring the need for a better approach for managing generating resources. This paper presents the development of a dynamical model of the operating head of Jebba hydroelectric power plants for system studies and control system design. The mathematical model of the plant was developed from flow continuity conditions, some model parameters were obtained from the source while others were estimated from observations and analysis of the measured data. The developed dynamical equation was validated by comparing the response produced with values obtained by measurement. Upon integrating the model equation in Microsoft EXCEL VBA® environment, a deviation of 2% from measured values was observed. Operators can therefore use the model as a decision support system, while control engineers can find the model directly applicable for optimal and robust control system design for the station.
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    Duty Cycle Analysis of Radio Spectrum Profile Utilization for Cellular Bands
    (Nigerian Institution of Professional Engineers and Scientists, 2020) Akanni, Jimoh; Abdurrhaman, Isa; Thomas, Cornelius; Alao, Rasaq; Adeshola, Abimbola
    Wireless technology offers more flexible and inexpensive ways of communication and with four key comparative advantages over the wired technology–increased efficiency, high availability, greater flexibility and mobility for users at a far better reduced cost of installation and maintenance [1]. The high increase in the growth of wireless devices with the present static radio spectrum management has created an inadequacy in the available radio spectrum [2], and presently the spectrum regulatory bodies are of the view that static spectrum management approach giving exclusive right of way to use licensed is still efficient [3]. The global monthly data traffic grew by about 69% from 1.5 exabyte in 2013 to 2.5 exabyte at the end of year 2014 and this is expected to reach up to 24.5 exabyte in 2019 and beyond that as forecasted by Cisco visual networking index [4]. This static allocation of radio spectrum is no longer adequate to grant access to the exponential growth of the wireless device because some portions of the radio spectrum are heavily used while the others are rarely used or not used at all; thus the inadequate sharing of the radio spectrum among users can lead to the opening of unwanted denial of service event [5]. In addition, the demand for wireless coverage, capacity, connectivity and services will continually expand and a critical barrier is the scarcity of the radio spectrum because it is fixed and cannot be expanded.
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    Dynamical control model of the cascaded Kainji-Jebba hydropower operating head
    (Published by Faculty of Engineering, Federal University Oye-Ekiti, Ekiti state, Nigeria, 2019) Akanni, Jimoh; Ogunbiyi, Olalekan; Thomas, Cornelius; Omeiza, Issac; Olufeagba, Benjamin
    Operation and design of control system for the cascaded Kainji-Jebba hydropower system poses a great challenge to researchers and engineers. The difficulties arose from the fact that the system is affected by several nonlinear interacting factors such as variations in inflows, stochastic factors that are weather related, availability of the turbo-alternators, and numerous other constraints that are influenced by the system dynamics. All these makes the mathematical representation of the system difficult. This paper presents the development of a dynamical model for the operation and optimal control of the operating heads of the cascaded system. The mathematical models were developed from energy conversion equation and Bernoulli’s equation. The model was calibrated and tuned using measured data. Upon validation by comparing the response of the model with measured head, a deviation within ±2% was observed, making it a good prediction of the system response and appropriate for control system design.
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    Nonlinear control model and operational support system for the Kainji Hydroelectric Power System
    (Faculty of Engineering, University of Nigeria, Nsukka, Nigeria, 2019) Akanni, Jimoh; Ogunbiyi, Olalekan; Thomas, Cornelius; Omeiza, Issac; Olufeagba, Benjamin
    Over the past years, hydropower model and control were largely based on classical and linear transfer function, this was motivated by the available control system design techniques that were available and the desire to simplify the design procedure. Such a model is inadequate for dynamic study and design of hydropower station in the presence of uncertainties in the water head, discharge rate, elastic water effect, traveling wave effect, large variation power output and frequency. This research, therefore, focuses on developing a nonlinear model for the Kainji hydroelectric power station. The model relies on the energy conversion principles, inflows, discharge, evaporation rate and number of units on busbar. The parameters of the model were also estimated, and the model validated with an error within +1.4% to -3.6%. The model is expected to be used to determine the optimal control policies for the operation of the station and the release of water to the downstream.
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    A steepest descent algorithm for the optimal control of a cascaded hydropower system
    (Institute of Advanced Engineering and Science, 2020) Akanni, Jimoh; Ogunbiyi, Olalekan; Thomas, Cornelius; Omeiza, Issac; Olufeagba, Benjamin; Ogundepo, O.Y.
    Optimal power generation along the cascaded Kainji-Jebba hydroelectric power system had been very difficult to achieve. The reservoirs operating heads are being affected by possible variation in impoundments upstream, stochastic factors that are weather-related, availability of the turbo-alternators and power generated at any time. Proposed in this paper, is an algorithm for solving the optimal release of water on the cascaded hydropower system based on steepest descent method. The uniqueness of this work is the conversion of the infinite dimensional control problem to a finite one, the introduction of clever techniques for choosing the steepest descent step size in each iteration and the nonlinear penalty embedded in the procedure. The control algorithm was implemented in an Excel VBA® environment to solve the formulated Lagrange problem within an accuracy of 0.03%. It is recommended for use in system studies and control design for the optimal power generation in the cascaded hydropower system.
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    z-Normalized Download and Upload throughput on UMTS Networks
    (Jaye Publications, 2020) Akanni, Jimoh; Abdurrhaman, Isa; Thomas, Cornelius; Alao, Rasaq; Adeshola, Abimbola; Abdullahi, A
    Wireless data networks as become the most efficient and reliable telecommunication services for providing internet services to most people around the globe. Over 50 billion wireless devices is expected to be connected by the end of 2020, all of which are likely going to demand access to the internet making the demand for wireless connectivity, coverage, capacity and services to continually expanding; all of which can be evaluated based on end user satisfaction. The end users demand reliable, accurate, consistent tools and methodology that help them to measure the download and upload throughput; also the operators are interested to predict the future throughput based on historical data from the past. In this research, we come up with a methodology to effectively and accurately measure the download and upload of the UMTS data network in a real wireless environment from end users point using three selected operators on the University of Ilorin main Campus. We normalized mathematically the measured value and compare the performance with the minimum value for UMTS wireless network and there after compare each operator to provide the end user with an effective decision tool in order to acquire maximum satisfaction. Based on the result we suggested an app should be develop similar to that used in the study and then the measurement period should be increased for better prediction by operators and to provide more data information for the end users to aid their decision thereby increasing their satisfaction