DEPARTMENT OF ELECTRICAL AND ELECTRONIC ENGINEERING
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Item Post-graduate experience(1998) Fakolujo, O. A.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 A performance analysis of delta and huffman compression algorithms(2009) Oke, A. O.; Fakolujo, O. A.; Emuoyibofarhe, O. J.With the recent trend in Information and Communication Technology, Storage and Transfer of data and Information are two vital issues which have Cost and Speed implication respectively. Large volume of data (text or image) is constantly being processed on the internet or on a Personal Computer, which has led to the Upgrade of current System. Hence, the need for compression, which reduces storage capacity and effect Speed of transfer. Data Compression is the act of reducing the size of a file by minimizing redundant data. In a text file, redundant data can be frequently occurring characters or common vowels. This research involves a comparative performance analysis of Huffman and Delta Compression schemes. A compression program is used to convert data from an easy-to-use format (ASCII) to one optimized for compactness. Huffman and Delta algorithms were implemented using C#. Result was also presented on the efficiency of the former based on three parameters: the number of bit, compression ratio and percentage of compression. It was discovered that Huffman algorithm for data compression performs better, since it can store / transmit the least number of bits. The average compression percentage for Huffman and Delta algorithm was found to be 39% and 45% respectively. Which simply implies that for a large text file, Huffman algorithm will achieve a 39% reduction in the file size and as such increase the capacity of the storage medium.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 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 A modified linear contribution factor model for improvement of relability indices of electrical distribution systems.(2009) Ajenikoko, G. A.; Fakolujo, O. A.; Raji, T. I.In Nigeria, satisfactory degree of reliability has not been attained in our power systems in recent times. The average duration of interruptions that customers experience is quite high and the degree varies from place to place. This is evident all around the nation, most especially in urban commercial cities. Previous researchers have focused on assessment of power system reliability indices using different models. In this work, a computationally efficient 'modified linear contribution factor model (LCFM) is developed. The model can be used for appreciable improvement of all the major system reliability indices of practical distribution systems unlike the conventional LCF model which can only improve some of the system reliability indices of practical distribution systems. Data collection and data analysis were carried out to develop the LCF model used on the three selected distribution systems on the Nigerian National Grid. The results 'of this work indicates that part of the reliability indices computed for the distribution systems SAIFI is more sensitive to the LCF model than SAIDI and CAIDI but that the sensitivity is low for SAIDI index compared to CAIDI. This is due to the quantization of the annual number of customer interruptions caused by the type and placement of protective devices on the distribution systems of the National Grid. With the use of the modified LCF model, the average percentage improvement in the system reliability indices become 97.72%. 98.55% and 98.63% for Ibadan, Ilorin and Ikeja distribution systems respectively as against an average percentage improvement of 36.08%. 11.36% and 24.36% in the system reliability indices for Ibadan, Ilorin and Ikeja distribution systems respectively with the use of conventional LCF model. The result of this research work confirms the efficiency of the modified LCF model.Item A framework for electronic nose based condition monitoring and diagnosis of automobile engine faults.(Nigeria Computer Society, 2009) Arulogun, O. T; Fakolujo, O. A.; Waheed, M. A.; Omidiora, E. O.; Olaniyi, O. M.A framework for condition monitoring approach that uses the sense of smell was investigated to diagnose the faults of plug-not-firing, loss of compression and carburettor faults from the exhaust fumes of gasoline fuelled automobile engine. An electronic nose based condition monitoring hardware and software was developed using the framework to obtain smell prints that correspond to normal operating conditions and various induced abnormal operating conditions. Fuzzy C-means and K means clustering were used as exploratory data visualization tools to ascertain if the obtained smell prints from the developed system could characterize the faults considered. The results of exploratory cluster analysis showed that the obtained smell print could typify the faults considered.
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