School of Electrical Engineering and Technology (SEET)

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School of Electrical Engineering and Technology (SEET)

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Performance Analysis of Statistical Time Division Multiplexing Systems
(Leonardo Electronic Journal of Practices and Technologies, 2010) Ajiboye, Johnson Adegbenga; Yinusa Ademola Adediran
Multiplexing is a way of accommodating many input sources of a low capacity over a high capacity outgoing channel. Statistical Time Division Multiplexing (STDM) is a technique that allows the number of users to be multiplexed over the channel more than the channel can afford. The STDM normally exploits unused time slots by the non-active users and allocates those slots for the active users. Therefore STDM is appropriate for bursty sources. In this way STDM normally utilizes channel bandwidth better than traditional Time Division Multiplexing (TDM). In this work, the statistical multiplexer is viewed as M/M/1queuing system and the performance is measured by comparing analytical results to simulation results using Matlab. The index used to determine the performance of the statistical multiplexer is the number of packets both in the system and the queue. Comparison of analytical results was also done between M/M/1 and M/M/2 and also between M/M/1 and M/D/1 queue systems. At high utilizations, M/M/2 performs better than M/M/1. M/D/1 also outperforms M/M1.
Conservation of Mobile Terminal’s Battery Life Using Dynamic Power Control Algorithm
(SAP, Journal of Wireless Networking and Communications, 2012) Oyewobi S. Stephen; Elizabeth N. Onwuka
Most of our activities today are tied around being able to make a call or connect to the Internet with our Mobile devices. However, to optimally utilize the network and deliver the needed satisfaction to the user the mobile device needs to be powered. Sadly most mobile devices are powered by energy-limited batteries, which impose a constraint on the mobile terminal optimal performance and on the network utility. As a result, special emphasis is now being laid on extending the battery life of mobile devices. In this work, we present a simple and effective power control algorithm, which conserves battery power by dynamically responding to real-time network conditions to adjust mobile terminal’s transmit power. BER (bit error rate) in measurement reports obtained from signals received from the mobile terminal were used to estimate signal quality that helps to determine the network conditions and adjust mobile terminal’s transmit power accordingly. Our algorithm was tested using simulation models, and our results were compared with the Stepwise algorithm, which is a popular power control algorithm in literature. A reasonable improvement was recorded for length of operation time and battery-energy saved for the mobile terminal over stepwise algorithm.
Wireless sensor networks for remote healthcare monitoring in Nigeria: Challenges and way forward
(IEEE, 2013) Hassan, N. M.; Olaniyi, O. M.; Ahmed, A.; Dogo, E. M.
Wireless sensor networks have gained a lot interest in the field of medicine with a wide range of capabilities. In most developed countries wireless sensor networks are being used in monitoring critical illnesses such as Cancer detection, cardiovascular diseases, monitoring asthmatic patient and in the treatment of Diabetes. Wireless sensor networks have enabled medical doctors to monitor patients remotely and give them timely feedback and support; potentially increasing the reach of health care by making it available anywhere at any time The application of Wireless Sensor Networks for remote medical monitoring is relatively new in Nigeria. Recently the Nigerian government embarked on the use of e-health to meet the health requirements of its remote and rural dwellers. In this paper, we discuss some of the core challenges facing the application of wireless sensor networks for remote medical care monitoring in Nigeria, and how these challenges can hinder the application of Wireless Sensor Networks for remote healthcare in Nigeria.
Design of a Simple and Low-Cost Microcontroller Based Medicare Device for Heart Beat Monitoring
(IEEE, 2013) Dogo, E. M.; Sado, F.; Adah, S. M.
Heart beat monitoring is vital to ensuring healthiness of the human cardiovascular system, but availability of a simple and low-cost heart beat monitoring device that does not require expert medical personnel to handle still remains a challenge especially in rural and semi urban areas of developing countries like Nigeria. This paper describes the design and implementation of a simple, reliable, accurate and cost effective microcontroller based heart beat monitoring device with Liquid Crystal Display (LCD) and voice outputs. The heart rate of the subject is measured from the fingertip using optical sensors and the rate is then displayed on a text based LCD and voice outputs in English language and two Nigerian indigenous languages (Hausa and Yoruba).
Feasibility analysis of critical factors affecting cloud computing in Nigeria
(Institute of Advanced Engineering and Science (IAES), 2013) Dogo, E. M.; Salami, A. F.; Salman, S.
Cloud computing is an evolving and new way of delivering computing services and resources over the internet which are managed by third parties at remote sites. Currently, Cloud computing is enjoying a lot of buzz in Nigeria due to its perceived economic and operational benefits and stakeholders believe that it will transform the IT industry in Nigeria. Despite all its promises there still exist so many challenges before Cloud computing is fully adopted in the Nigerian ICT sector. This paper delivers an overview of Cloud computing together with its advantages and disadvantages. Thereafter, the challenges affecting the adoption of Cloud computing and drivers of oppoturnities that will favour and nurture the adoption of Cloud computing by organisations in Nigeria are outlined. Finally, recommendations for the adoption of Cloud computing technology by stakeholders in Nigeria are discussed.
An Improved Rain Activated Automatic Window
(Biennial Engineering Conference, School of Engineering and Engineering Technology (SEET), 2013) Oyewobi S. Stephen; Okwori M; Achonu A. O; Waheed A. M
Meteorological conditions like temperature, wind, clouds, and precipitation (rainfall) influence the condition of comfort inside a house, especially through wind doors and windows; hence the need for proper control activator (either to is close aimed or at open) having of window control made convenient to home owners by the use of a switch to open windows in a an improved automatic window with rain or close the window. The design was conceived after observing the stress mechanical windows give us in our control of it to let air and light come into the house; therefore, advancement in electronics technology was used to design this automatic window. However, unlike existing automatic windows, a rain sensor has been included in this work to help shut the window automatically when rain is falling. To achieve this, a moisture sensor is incorporated in the design to sense rainfall, a forward and reversing DC Motor to move the window pane back and forth, a bistable circuit to control the movement of the DC Motor and a power supply to power the system.The design of ble circult to control work effectively in convenient control of windows for the comfort of the homes and in protecting the homes from rainfall. Keywords: Automatic window, rain activator, mechanical window, electronics, DC motor.
Pattern and Feeder Design for the Production of Grey Cast Iron Brackets
(IUP Journal of Mechanical Engineering, 2013-08-01) Mary Adebola Ajiboye; Matthew Sunday Abolarin; Ajiboye, Johnson Adegbenga
In this paper, the design and production of sand casting for a gray cast iron bracket was carried out. The bracket was divided into different sections called Appendages A,B,C and D, and Ribs E and F. Efficient feeder design is important so as to minimize casting defects such as porosity and incomplete filling to the barest minimum. The feeder or riser is used to feed metal to the casting as it solidifies; therefore, they are designed and positioned such as to ensure filling the cavity during solidification. The implication of this is that the riser must be designed to be large enough so that it solidifies only after the casting and it should contain a sufficient volume of metal capable of supplying the shrinkage contraction which occurs on cooling from the casting temperature to the completion of solidification. Based on the feeder design in this work, two bracket castings were produced.
Cross-Layer Integration Approach for Improving QoS for IPv6 Based VOIP
(iJET, 2014) Dogo, E. M.; Ahmed, A.; Olaniyi, O. M.
Voice over IP (VOIP) is today one of the most innovative IP based Communication Technologies in the Telecommunications industry. This has made it to enjoy a high degree of success in its application in small, medium and large scale enterprises, primarily to save cost as well as leveraging on its enhance functionalities such as mobility and scalability. Despite all its successes, VOIP still faces challenges with Quality of Service (QoS) degradation. This paper proposes a cross-layer model to effectively manage interactions in the data, network and transport layers guided by tradeoff between three performance metrics that affect QoS of VOIP for an improved QoS for Voice over IPv6 (VOIPv6). The parameters taken into consideration in this proposed model are: packet loss, delay and throughput observe by the end user.
Development of Feedback Mechanism for Microcontroller Based SMS Electronic Strolling Message Display Board. African Journal of Computing & ICT
(African Journal of Computing & ICT, 2014-08-12) Dogo, E.M., Akogbe A.M., Folorunsho, T. A., Maliki, D., & Akindele, A
Digital electronic display board is fast gaining acceptance and application in different spheres of life which include educational education institution, public utility places and in advertisement due to the problem associated with constitution of signposts and manually placement of papers on walls, buildings, and edifies which makes the environment look untidy. This paper presents the design and development of a microcontroller based electronic strolling message display board, which will be used to display messages and information in real-time via SMS. This microcontroller based electronic strolling message display board offers the flexibility to a user to control the message or information displayed without recourse to geographical location of the user, provided there is GSM (Global System for Mobile Communication) mobile network. It therefore eliminates the inconveniences of physically going to the display board to manually input information using a computer system. The paper also incorporates a feedback mechanism from the remote display board to ascertain that the message sent by the user has been displayed. The circuit of the devices is designed based on PIC18F4520 microcontroller and C-programming language is used to program the microcontroller.
An Improved GSM Technology-Based Microcontroller Multi-Sensor Home Security and Monitoring System
(International Engineering Conference (IEC), School of Engineering and Engineering Technology (SEET), 2015) Oyewobi S. Stephen; M. Okwori; E. U. Mpkuma; W. M. Audu
With increasing rate of crime all over the world, and with no pointer to this rate of crime abating anytime soon, home security has now become a major concern. Therefore most people; rich or poor are taking measures from highly sophisticated to very crude methods to prevent intrusion. This work presents a GSM technology-based home security and monitoring system. However, unlike the traditional magnetic switch alarms equipped on doors and windows, this system has incorporated a fire detector, a motion sensor and a moisture (rainfall) sensor. On any attempt of a break in, rainfall or possible smoke or fire a short message service (SMS) is sent to the house owner. The system is built using a programmed microcontroller interfaced with mobile phone (NOKIA 1209) such that the three major buttons of the mobile phone are switched at intervals to send a message to the owner of the house anytime there is an intruder, rainfall or fire accident. The system was tested and it worked on attempt of intrusion, rainfall (water) and smoke.
EFFECTS OF UNIFIED POWER FLOW CONTROLLER (UPFC) ON DISTANCE RELAY TRIPPING CHARACTERISTICS IN THE NORTH-CENTRAL NIGERIAN 330kV NETWORK
(Nigerian Journal of Technology (NIJOTECH), 2015-10) Yusuf, Latifa
This paper investigates the effects of UPFC on Distance Relay tripping characteristics in the Nigerian 330kV (North-Central) Network. Its operation is based on impedance measurement at the relaying point. However, the system performance is often impeded by certain operational or structural factors such as load angle, the voltage magnitude ratio at the line ends, pre-fault line loading, and short circuit levels at the line ends. The Unified Power Flow controllers (UPFC) incorporated into the Nigerian 330kV (North-Central) Network were modelled in the environment of Power System Computer Aided Design (PSCAD) and kept within the protected zone of the relay to increase the Apparent Resistance, causing the relay to malfunction. Therefore, it is deduced by simulation analysis that the presence of UPFC in a faulted transmission line loop, protected by distance relay, greatly affects the trip boundaries of the distance relay by setting it to either an over-reaching or an under-reaching state. Hence, the tripping characteristics of distance relay with UPFC located at various points with respect to a fault on a transmission line culminated in three scenarios, the results of which are presented and discussed in this paper.
Selection of window for inter-pulse analysis of simple pulsed radar signal using the short time Fourier transform
(2015-10-01) Ashraf Adamu Ahmad, Abdullahi Daniyan, David Ocholi Gabriel
The electronic intelligence (ELINT) system is used by the military to detect, extract information and classify incoming radar signals. This work utilizes short time Fourier transform (STFT)-time frequency distribution (TFD) for inter-pulse analysis of the radar signal in order to estimate basic radar signal time parameters (pulse width and pulse repetition period). Four well-known windows functions of different and unique characteristics were used for the localization of STFT to determine their various effects on the analysis. The window functions are Hamming, Hanning, Bartlett and Blackman window functions. Monte Carlo simulation is carried out to determine the performance of the signal analysis in presence of additive white Gaussian noise (AWGN). Results show that the lower the transition of main lobe width and higher the peak side lobe, the better the performance of the window function irrespective of time parameter being estimated. This is because 100 percent probability of correct estimation is achieved at signal to noise ratio of about-2dB for Bartlett, 4dB for both Hamming and Hanning, and 9dB for Blackman.
Polynomial based Channel Estimation Technique with Sliding Window for M-QAM Systems
(The Science and Information Organisation, International Journal of Advanced Computer Science and Applications, 2016) O. O. Ogundile; M. O. Oloyede; F. A. Aina; Oyewobi S. Stephen
Symbol Assisted Modulation (PSAM) channel estimation techniques over Rayleigh fading channels have been analysed in recent years. Fluctuations in the Rayleigh fading channel gain degrades the performance of any modulation scheme. This paper develops and analyses a PSAM Polynomial interpolation technique based on Least Square (LS) approximations to estimate the Channel State Information (CSI) for M-ary Quadrature Amplitude Modulation (M-QAM) over flat Rayleigh fading channels. A Sliding window approach with pilot symbol adjustment is employed in order to minimize the computational time complexity of the estimation technique. The channel estimation performance, and its computational delay and time complexity is verified for different Doppler frequencies ( fd), frame lengths (L), and Polynomial orders (P-orders). Simulation results show that the Cubic Polynomial interpolation gives superior Symbol Error Rate (SER) performance than the Quadratic Polynomial interpolation and higher P-orders, and the performance of the Polynomial estimation techniques degrade with increase in the P-orders
A GSM-Based Remote Controlled Poultry Feed Dispensing System Using DTMF
(2016) Ahmed, A.; Olaniyi, O. M.; Dogo, E. M.; James, E.
Poultry rearing for small scale and commercial farmers has made large contribution in food production. With the recent decline in contribution of livestock subsectors to the national economy, there is a need to device a means of making poultry farming convenient, attractive and maximize yield. Automated Feeding is considered very important in poultry production; however, many famers in the tropical regions practice subsistence farming and mostly employ manual poultry feeding. This paper presents the development of a GSM-based remote-control poultry feed dispensing system via Dual Tone Multi-frequency (DTMF) for intermittent control of poultry feed dispensing. Proper knowledge in this area by farmer will help in running effective production and increase yield in meat and egg to maximize profit. The system is multi state fully input dependent system whose change of state can be controlled by a remote control. The developed mechatronic system reduces manpower, saves time and operates efficiently with minimal human involvement in poultry feeding. The system demonstrated practical effort regarding the improvement in performance of existing solid feed dispensing for high yield with minimal human intervention
Design and Implementation of a 5 kVA Inverter
(IUP Journal of Electrical and Electronic Engineering, 2016-10-01) Ajiboye, Johnson Adegbenga; Chukwuka Anene; Mary Adebola Ajiboye; Abraham U. Usman
The paper describes the design and construction of a 5 kVA Pulse Width Modulated (PWM) Metal Oxide Semiconductor Field Effect Transistor (MOSFET)-based inverter, which works on the principle of PWM. The inverter uses IC SG3524 and a pair of Twelve MOSFETs to drive the load. The design and implementation starts with the power supply. Component selection was made with the aid of electronics data book, which made the design and calculations very easy. One main feature of this inverter is the monitoring section, and the battery-charging section connected to the inverter circuit. The inverter converts DC supply of the battery into AC power supply required by most electrical appliances/equipment when the AC main is not available; and when the AC main is available, the supply goes to the AC main sensor, the relays and battery charging section of the inverter. This inverter can be used for domestic purpose, and it is not recommended for industrial purpose where high current is required for application, such as starting a heavy-duty motor
Development of Secure RFID Authentication System for Electronic Inter-Campus Transportation Billing
(ATBU, 2017) Kolo, J. G., Dogo, E. M., Olaniyi, O. M., & Oyegbemi, S. A.
A good transportation system is an essential recipe to the economy of every city. This work made attempts to improve the transportation billing system by automating the process using RFID technology, devoid of physical cash collection. Inter-campus University transportation service is taken as a case study. Secure RFID reader and tag was used, employing an AES encryption scheme for authentication, where users register with their student identification card which is their unique RFID tags and credit their account in preparation for future travel. The prototype system is developed to place on hold a faulty vehicle while making suggestions for vehicles that are available for travels. The system also saves the record of each travel with respect to the time and destination of the vehicle. Accuracy and response time were metrics used to evaluate the performance of the implemented prototype system; the accuracy of the system when tested on fifteen
Development of a Biometric Based Car Park Access Control and Billing System
(2017) Inalegwu, O. C., Dogo, E. M., Kolo, J. G., Bima, M. E., Ajao, L. A., & Inechioma, J.
Access control involves the granting of authorization for a service to selected persons while restricting others. This paper involves the development of a car park access control system using both biometric and barcode system for the authentication. In addition to providing security to the parked cars, the developed system also automates billing for the car park users. The associated barcode is scanned while entering and exiting the car park. The difference in time is used to compute the amount payable and this is deducted from the specified user’s account. Furthermore, the developed system was evaluated using response time, false acceptance and rejection metrics. The result derived therein proves that the system is reliable with very low false rejection and false acceptance rates of 0.5% and 0.45% respectively. The response time of the system, measured as 1.407s, demonstrates its level of efficiency. In conclusion, the working prototype designed, proves that it can be easily implemented on a large scale with a low maintenance cost.
Kalman-Gain Aided Particle PHD Filter for Multitarget Tracking
(IEEE, 2017-04-05) Abdullahi Daniyan; Yu Gong; Sangarapillai Lambotharan; Pengming Feng; Jonathon Chambers
We propose an efficient sequential Monte Carlo probability hypothesis density (PHD) filter which employs the Kalman-gain approach during weight update to correct predicted particle states by minimizing the mean square error between the estimated measurement and the actual measurement received at a given time in order to arrive at a more accurate posterior. This technique identifies and selects those particles belonging to a particular target from a given PHD for state correction during weight computation. Besides the improved tracking accuracy, fewer particles are required in the proposed approach. Simulation results confirm the improved tracking performance when evaluated with different measures.
Artificial Neural Network Application for Error Estimation in Wireless Sensor Network
(IEEE Forum (ICSTEM), 2017-05-06) Agajo, J., Kolo, J. G., Maliki, D., Umar, B. U., Inalegwu, O. C.
This paper comes up with an error estimation model for Wireless Sensor Nodes,, the integrity of data received after transmission within a signal coverage range less or equal to 45 metres is analysed, Neural Network linear regression method was used to evolve resolve equation that compares error with weight of data received as δ℮(w) against δwij , an equation for error rate was also evolved after carefully comparing between data packet transmitted and Packet received, error rate er for sensor node was calculated to be 0.00918 thereby establishing the fact that expected packet to be received for every data transmitted is the product of er and Packet Transmitted.
Evaluation of Speech Quality Based on QoS Key Performance Index (KPI): A Survey
(Federal University of Technology Minna, 2017-05-06) Gbadamosi, A. S., & Maliki, D.
The utmost contest between cellular operators have left the customers highly selective with the quality of speech based on the quality of service (QoS) experienced. In order to quantitatively and qualify the network performance based on speech quality, different key performance indicators (KPI) used, are classified to aid data collection methods that are used to reduce impairment as its affect speech are discussed and classified according to their operational mode. It provides a detailed report about the perceptuality of speech quality and its statistical expectation of the network. Each of these techniques has its advantages and disadvantages as applied to underscore the network performance from a user’s point of view. These techniques evaluate degradation caused by various impairments in cellular networks. Its I s our hope that, if user get hold of these applications, it will go a long way to keep cellular operators on their toes