ABSTRACT This study presents a comparative study of two controllers for position and speed control of DC servomotor. PID controller is the most usually used for the position control in DC servomotor. However, the PID controller has some disadvantages such as: the high starting overshoot, slow response for unexpected disturbance and high sensitivity to the controller gain. So, the reasonably design PID controller with computational optimization approach method is proposed to overcome the disad...
Abstract Temperature rise is of much concern in the short and long term operations of induction machine, the most useful industrial work icon. This work examines induction machines mean temperatures at the different core parts of the machine. The system’s thermal network is developed, the algebraic and differential equations for the proposed models are solved so as to ascertain the thermal performances of the machine under steady and transient conditions. The lumped parameter thermal method...
ABSTRACT The purpose of this work is to make a contribution to the “Abuja grand design” by proposing a strategy that would facilitate making Abuja feature as a “modern city”. This proposal is entitled “Policy and Regulatory Framework for Fiber Optic Backbone in Abuja”. The main import of the strategy is to network every home and business in Abuja with fiber optics. The city fiber network would serve as a broadband communication medium to provide essentially unlimited and open comm...
ABSTRACT A model of Intelligent Mobile Learning System (IMLS) Using Multi-Agents has been developed and tested in the course of the project reported in this thesis. The IMLS was tailored to match the peculiarities of developing countries especially in terms of limited communications infrastructure and unsteady power supply. Mobile devices communicating over wireless networks are used to provide interaction between learners and teachers anywhere, anytime. In addition to the MultiAgent based IM...
ABSTRACT One of the research challenges in cellular networks is the design of an efficient model that can reduce callblocking probability and improve the quality of service (QoS) provided to mobile users. One most important parameter for assessing the quality of service (QoS) in a network is the probability of dropped calls, which has so far not been deeply studied within the context of established cellular networks. Call/packet dropping refers to the event described as the termination of cal...
ABSTRACT Effective management of large amount and different types of data encountered in daily operations is a major challenge facing academic institutions. Traditional paper based operation is not only costly, but also ineffective. Based on the requirements of the Student Records Office, a student information management system (SIMS) is designed and implemented for Digital Bridge Institute (DBI) in this work. The system is developed to provide DBI with a means to effectively manage its infor...
ABSTRACT With the rise of internet and the explosion of data sources, more and more companies are facing new challenges are facing new challenges that were previously very rare. Those problems concern the storage and the usability of set of data so big and often growing so fast that the usual tools were no more adapted. Moreover the multiplication of data sources and types lead to the problem of storing data that should be considered as unstructured in fixed and structured data models provide...
ABSTRACT For accurate and high rate of lung cancer detection using image processing, an effective preprocessing technique is required. A quality preprocessing technique is necessary to ensure effective removal of noise that interferes with the features of the image and hence improves lung cancer detection rate and accuracy. In this research, an Improved Gaussian Filter (IGF) technique was developed for effective lung image preprocessing. For image segmentation, Otsu thresholding method was us...
ABSTRACT The study used passive compensators and FACTS controllers to achieve power system compensation by obtaining load flow of the Northern Nigerian 330kV transmission grid; determining the voltage magnitudes at the various buses; identifying the voltage violations and applying the passive compensators and FACTS controllers at the worst case scenarios of the voltage violations. The work compared the effects of the compensators on the Northern Nigerian 330kV transmission grid. The load flow...
ABSTRACT This work addressed the problem of forecasting active and reactive power at a substation transformer in a distribution system. Accurate power forecast is of great importance in power distribution planning, reactive power support control and intelligent power management. Due to the complexity of the power system, an intelligent and adaptive forecast algorithm based on the Adaptive Neuro-fuzzy Inference System (ANFIS) was modeled for the power forecast. For the proposed ANFIS forecast ...
ABSTRACT This work presents the influence of rotor Caged winding on the performance of a Transfer Field (TF) machine. The transfer field (TF) machine comprises two identical machines that are integrally wound and mechanically coupled together but with their pole axes 90 electrical degrees out of phase. This project investigates the influence of rotor caged winding on the performance of a transfer field machine using the analysis of the caged and cage-less rotor winding configurations. From th...
ABSTRACT The need to increase the number of channels in a limited radio spectrum while covering a large area in a mobile cellular network has lead to the use of various cell design techniques. With an increased number of channels, handover calls can be dropped while moving from one cell to another in the search of a better signal or as a result of user mobility. New calls are also blocked when the traffic channels are fully occupied. However, new calls should be treated fairly and not to be e...
ABSTRACT In this thesis, a current source inverter fed squirrel cage induction motor drive at constant air gap flux is presented. The drive scheme is conceived to take advantage of the short circuit withstand capability of the current source inverter and the ruggedness (even under harsh conditions) of the squirrel cage induction motor. The variable inverter input dc link current is derivable from either a controlled ac to dc converter or a controlled dc to dc converter. The constant motor air...
ABSTRACT This study sought to understand the role of the Internet in information provision, within the context of other sources of information and everyday information needs. The study also presents findings about the current ways in which people who are blind and visually impaired find information for their everyday lives; the role of the Internet in this process; barriers to using computers and the assistive technologies. A system was designed and created using Visual Basic studio15 to sho...
ABSTRACT In this thesis, a novel approach for the protection of transmission lines which utilizes only coefficient energy for both detection and classification is proposed. The fault current signals generated by workspace on MATLAB simulation model have been analyzed using Daubechie-4 (d4) mother wavelet at 7th level decomposition with the help of Wavelet Toolbox embedded in MATLAB. A case study of 132kV, 160km transmission line has been used to test the novel approach. The value of the coeff...