DEPARTMENT OF ELECTRICAL AND ELECTRONIC ENGINEERING
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Item A prototype of a fingerprint based ignition systems in vehicles(EuroJournal Publishing, Inc., 2011) Omidiora, E. O.; Fakolujo, O. A.; Arulogun, O. T.; Aborisade, D. O.Biometric systems have overtime served as robust security mechanisms in various domains. Fingerprints are the oldest and most widely used form of biometric identification. A critical step in exploring its advantages is to adopt it for use as a form of security in already existing systems, such as vehicles. This research work focuses on the use of fingerprints for vehicle ignition, as opposed to the conventional method of using keys. The prototype system could be divided into the following modules: fingerprint analysis software module that accepts fingerprints images; hardware interface module and the ignition system module. The fingerprint recognition software enables fingerprints of valid users of the vehicle to be enrolled in a database. Before any user can ignite the vehicle, his/her fingerprint image is matched against the fingerprints in the database while users with no match in the database are prevented from igniting the vehicle. Control for the ignition system of the vehicle is achieved by sending appropriate signals to the parallel port of the computer and subsequently to the interface control circuit. The developed prototype serves as an impetus to drive future research, geared towards developing a more robust and embedded real-time fingerprint based ignition systems in vehicles.Item Digital watermarking of still images with colour digital watermark(2010) Zubair, A. R.; Fakolujo, O. A.; Rajan, P. K.Digital watermarking is a popular tool for copyright protection, content authentication, detection of illegal duplication and alteration, feature tagging and secret communication. In this paper, a method of embedding a colour image as digital watermark into a host image is proposed. The watemark is first converted from the Red-Green-Blue (RGB) colour space to an index image. The index image is decomposed into a series of binary digital images for implementation as multiple watermarking. Experimental results shows that the proposed method is robust to resonable image processing operations and the lossy compression techniques such as the Joint Photographic Expert Group (JPEG) compression. Furthermore, application of democratic approach in signal sampling is found to produce better signal to noise ratio compared with uniform quantizaton approach.Item Design methodology and heuristic for reconfigurable hybrid macro pipeline multiprocessor(Duncan Science Company, 2010) Olakanmi, O. O.; Fakolujo, O. A."The research developed a reconfigurable hybridized multiprocessor system, Hybridized Macro Pipeline Multiprocessor (HMPM), which combines two multiprocessing techniques –macro pipeline and parallelism. This solves the problems associated with using multiprocessor system to execute sequential applications. In addition, a heuristic is developed for the system, this reconfigures the processors in each cluster according to input load in order to prevent load imbalance. Multiprocessor system has led to increased throughput of system in many applications such as image processing, computer graphic and real time systems. It has also contributed to the increasing use of parallel hardware along-with the associated software, which solves the bottleneck associates with high computation tasks. There are different ways of increasing the throughput in a multiprocessing environment. Parallelism technique; where different processors are allocated different parallel-subtasks at the same time. In macro pipeline, all the available processors must sequentially work on all the subtasks. Several researchers have proposed different form of multiprocessors using any of these multiprocessing techniques. However, these techniques are application dependent. That is some applications are sequential, for these applications, parallelizing their execution will reduce the throughput. Some are parallel in nature, executing these sequentially will also reduce the throughput. This made some of the proposed multiprocessor system application-dependent. This paper proposes a reconfigurable Hybridized Macro Pipeline Multiprocessor (HMPM); a hybrid multiprocessor system that combines sequential and parallel execution techniques in order to increase the multiprocessor throughputs and make it application-independent. HMPM uses homogenous processors as the processing elements. A streaming application is taken and broken into a series of subtasks, which are parallel assigned to different pipelined clusters. The problem of mapping each of the streaming unit into each of pipeline stage is solved with a simple architecture and heuristic that efficiently determine the design space. "Item Diagnosis of gasoline-fuelled engine exhaust fume related faults using electronic nose(2010) Arulogun, O. T; Waheed, M. A.; Fakolujo, O. A.; Omidora, E. O.; Olaniyi, O. M. O. M.Fault diagnosis, isolation and restoration from failure are crucial for maintenance and reliability of equipment. In this paper, a condition monitoring approach that uses the sense of smell was investigated to diagnose ignition and loss of compression faults in gasoline-fuelled engine. An electronic nose based condition monitoring system was used to obtain smell print of the exhaust fumes of an automobile gasoline engine in different normal and faulty operating conditions. The data were analyzed with fuzzy c-means, hybrid principal component analysis and artificial neural network. Fuzzy C- means clustering was used to ascertain the extent to which the smell prints can characterize the selected engine faulty and normal conditions. Silhouette diagrams and silhouette width figures were used to validate the clusters. The faults considered were all correctly classified by hybrid principal component analysis and artificial neural network algorithm with 100% accuracy.Item Reliability and quality assurance of electronic component(Duncan Science Company, 2010) Ajenikoko, G. A.||||Raji, T. I.; Fakolujo, O. A.; Raji, T. I.An electronic component is an entity in a system which can not be further sub divided in the course of a given relability. However a component can make up parts which is regarded as self-contained unit. Thus while thereliability of a system can be influenced by altering its structure, the reliability of what is considered a component cannot be changed in such a manner, and if different characteristics are desired, the component must be replaced by another with different reliability parameters. Electronic components can be classified into two groups. The first group are those that are observed only until they fail, because either they cannot repaired, or the repair is uneconomical, or the problem is such that only the life history up to the first failure is of interest. These called non-reparable (or non-repaired) and their failures are catastrophic. The second group are those components that are repaired upon failure, hence their life histories consist of alternating operating and repair periods. They are called repairable components. This paper presents the basic concept of electronic component reliability and quality assurance. A brief historical perspective is presented along with operational definitions. The factors affecting reliability as well as the costs to provide reliability re also described. Failure modes are depicted as well as the environmental effects that affects reliability.Item A generalized model for quantitative evaluation of reliability indices of the national grid system(2010) Ajenikoko, G. A.; Fakolujo, O. A.|; Raji, T. I.Reliability indices are considered to be reasonable and logic ways to judge the performance of an electric power system. Reliability indices which are proposed by the IEEE are used to evaluate the performance of selected distribution systems on the national grid. Ten years of outage data (1998 - 2007) from seven selected distribution systems on the national grid were used as case studies in this research work. A generalized model is developed for a quantitative evaluation of relative indices of the national grid system. The development of the model stated with identification of the system reliability indices and estimating the contributions of system indices to the failure rate of the selected distribution system on the national grid. The computed system reliability indices are used as input parameters for the generalized model. Relative CAIDI index is computed by simulation using MATLAB 7.7 which automatically generates the graph of the relative CAIDl against names of feeders. The percentage average relative CAIDls for Ibadan, Port-Harcourt and Benin distribution systems are 71.86%, 52.79% and 75.79% respectively, thus, average reliability levels. Ilorin, Ikeja, Kaduna and Kano distribution systems have percentage average relative CAIDls of 11.95%, 39.76%, 40.17% and 41.08% respectively with poor reliability levels. With the aid of curve fitting (cf) tools, two distinct model equations were developed from which a generalized model is formulated for a quantitative evaluation of reliability indices of the national grid. The generalized model is a polynomial function whose order depends majorly on the level of industrialization of the distribution systems and the number of distribution feeders.Item Development of a mosfet-based radio frequency amplifier for improved signal reception(Blackwell Educational Book, 2010) Falohun, A. S.; Fakolujo, O. A.; Abolade, R. O.It is highly desireable that the information routed from a source reaches the audience or destination with little or no interference or distortion. In radio wave propagation, at times, the signal received at the destination arrives with some form of noise; which makes the message unintelligible enough for the listener. And at some other times, the signal cannot even be picked up at the recieving end. Hence, a device that will obtain the maximum possible noise is desirable. In this research work, we designed a preamplifier using a Metal Oxide Semiconductor Feild Effect Transistor (MOSFET) to filter noise and to produce clearer pictures and better sound quality with increased directivity or gain. The MOSFET-based preamplifier was analyzed in performance and compared with the usaul Bipolar Junction Transistor (BJT) type. The result in analytical form showed a gain of 25.1dB in the MOSEFT-type and a 7.93dB in BJT. The designs were simulated with a simulator package, Electronic workbench 5.0. The result obtained agrees with the analytical results. However, for better monitoring of antenna behavior, particularly over a band of frequencies, a network analyzer is suggested. And for a more accurate and stable preamplifier circuit, a microprocessor can be considered for future design.Item Lorenz-based chaotic secure communication schemes(Research Insight Publishing Corporation, 2012) Kamil, I. A.; Fakolujo, O. A.Secure communication systems employing chaos have recently attracted significant interest. This is partly due to their high unpredictability and simplicity of implementation over conventional secure communications systems. This study presents the implementation of four chaotic modulation techniques employing Lorenz system as chaos generator. The techniques are Chaotic Masking (CM), Chaos Shift Keying (CSK), Chaos On-Off Keying (COOK), and Differential Chaos Shift Keying (DCSK). Simulations were carried out using Simulink in Matlab environment to implement these techniques. A qualitative evaluation of the transmitted signal waveforms in all the cases considered showed that DCSK gives the highest level of security followed by CSK while COOK gives the least level of security.Item Demonstration of chaos in selected chaotic systems(Scholarlink Research Institute Journals, 2012) Kamil, I. A.Chaos is one of the most important behavioural modes exhibited by dynamical systems and refers to the unpredictable, seemingly random, motion of trajectories of a dynamical system. In recent time, non-linear dynamics and chaos have become familiar in the technical vocabulary of most sciences and technology due to the various applications of chaos in these areas. Chaotic systems display chaotic behaviours only for specific range of values of their parameters. It is therefore important to understand the chaotic features as well as parameter values resulting in its emergence in systems. In this paper, the emergence of chaos in six chaotic systems was demonstrated using Simulink with specific initial conditions and parameter values. The simulation results obtained in form of time series illustrated noise-like waveforms which were unpredictable even after a long interval of time, while the phase portraits were irregular and sponge-like in appearance. The noise-like and unpredictable trajectories as well strange attractors observed clearly demonstrated the emergence of chaos the chosen parameter values.Item Intelligent fire detection system using mobile wireless network(2010) Arulogun, O. T; Fakolujo, O. A; Olaniyi, O. M.; Ganiyu, R. A.; Okediran, O.To protect lives and valuables against colossal loss due to fire outbreak in any society, provision of proper safty measures is sine qua non. This has been achieved through installation of adequate fire extinquisher in strategic visible places, installation of smoke sensors and provision of human security personnel.These methods are not only cost prohibitive, but most times fail to provide required hazard preventive measures at appropraite time. In this paper, we present an intelligent photoelectric fire detection system to provide prompt and adequate notification mechanisms to the occupants and relevant authorities about possible outbreak of fire via existing mobile wireless networks. The result from the implemented model shows how intelligent photoelectric fire detection system can help minimize possible consequences from the risk of fire outbreak.