Theses and Dissertations

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Theses and Dissertations (Computer Science)

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Browsing Theses and Dissertations by Author "Jaiyesimi, S. B."

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    A Computer Simulation Model of Optimum Sized Tractor Selection for Agricultural Mechanization
    (Obafemi Awolowo University, 1985) Adagunodo, Emmanuel Rotimi; Jaiyesimi, S. B.; Mensah, E. K.
    A computer simulation model for the selection of optimum-sized tractors based upon the durability and minimum cost analysis of the tractor has been developed. There is the need to optimize tractor sizes so as to minimize the cost and increase the productivity of farm mechanization process. The optimal replacement period and reliability of the tractor are considered in this study with respect to the volume of utilization of such tractor. A procedure for determining tractor optimum size through the replacement period and reliability analysis is presented in the study. The results of the study establish that two tractor models - David Brown 995 and 990 - of 62 and 58 horsepower respectively are recommended for the two categories of tractor owners and users involved in the study. DB 995 has been considered adequate for the private commercial farmers who cultivate between (30-40) hectares of land and DB 990 is recommended as the optimum machine for the government-owned tractor hiring units. The results of the work show further that a few policy implications may arise from changes in the two important quantities - maintenance and purchase costs of the tractor. A low maintenance and high purchase costs lead to extended replacement period and high durability. On the other hand, high maintenance and cheap purchase price of the tractor result in shortened replacement period and low durability for the tractor. The need to stop any subsidies on tractor purchase price and provide subsidized maintenance and repairs and also establish more government-owned tractor hiring units is stressed in the study.
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    Design of an On-line Library Cataloguing System.
    (Obafemi Awolowo University, 1985) Faleye, Emmanuel Omoniyi; Jaiyesimi, S. B.
    The work reported in this thesis is on the design of a portable on-line library cataloging system (including serials' cataloging and binding subsystem) for possible implementation at the University of Ife library. In on-line catalog systems, instead of writing records for each book onto cards (i.e. card catalogs used presently at University of Ife libraries) and transferring these cards onto the entry card catalog shelves (author catalog shelf, title catalog shelf and subject catalog shelf), only one record needs be written onto a random storage device. But this one record is indexed so that it can be found by the use of any one of the access keys for which separate card catalogs are created in a conventional system. All records in the file are easily accessible and the whole file is consequently available for machine searching in response to each interrogation from a terminal. The various programs were developed and implemented on the TRS-80 model II micro Computer with their sample outputs in Appendix C.
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    Design of an On-Line Library Circulation System.
    (Obafemi Awolowo University, 1987) Adeyekun, Basiru Gbolagun; Jaiyesimi, S. B.
    The work reported in this thesis is on the design of an on-line library circulation system for possible implementation at Hezekiah Oluwasanmi Library, University of Ife, Ile-Ife. The problems associated with orthodox manual library circulation processes were identified by studying library activities and functions in the Hezekiah Oluwasanmi Library. These problems include limited and restrictive information base of the manual library record keeping; undue user and staff time-input in book location and borrowing; inconvenience of processing and correlation of extensive manual records for circulation control; and human factor in penalty administration on book defaulters. This project exploits the tremendous capabilities of the computer for the development of an on-line library circulation system to solve the problems identified, and to enhance library circulation operations. An efficient and dynamic software has been developed for the on-line library circulation procedures. The design has been tested on an Eclipse C-150 Data General mini-computer and a TRS80 Model II micro-computer for later on-line implementation on a multi-tasking micro-computer. The design herein reported provides adequate and timely information which can be put to a variety of uses such as library clearance and security, enforcement of accountability, relief of users and library staff of routine clerical procedures, and bringing about an effective circulation system.
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    Design of an Online Computerised Payroll System.
    (Obafemi Awolowo University, 1986) Olufokunbi, Karen Cowan; Jaiyesimi, S. B.
    An on-line, interactive computerised payroll system was designed, and executed on the Data General Eclipse C-150 computer system. Its features include the production of payslips and associated payroll reports via a top-down design program and the protection of the system for security and confidentiality. The test run proved successful; with the estimated consumption of 27.66 hours to perform payroll calculations for 6,000 employees, and the associated preparation of payslips and payroll reports within the range of 7.5 hours and 21.0 hours depending on which of the eighteen different reports was being considered. Compared with the existing punched card batch-oriented payroll system used at the University of Ife, the designed program was fast in execution, used less human resources and materials in major aspects, and provided more detailed information. Lack of recent cost information on hardware components and differences in output from both the existing and the designed system prevented rigorous comparative pecuniary feasibility analysis. Based however, on the features exhibited by the existing program and the designed one, the latter is recommended; with associated guidelines that will enhance its effectiveness.
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    Digital Simulation of Stochastic Differential Equations.
    (Obafemi Awolowo University, 1985) Adewumi, David Olambo; Jaiyesimi, S. B.
    The study of stochastic differential equations started with mathematicians using them as tools in the solution of physical problems. In science and engineering, s.d.e. arises in a natural phenomenon known as "white noise". Some of the major works done in this area of study has been in the analytical solution of s.d.e., very little attention has been paid to digital simulation techniques. In this thesis we have evolved a digital and analog simulation technique for solving s.d.e s. We have used the TRS-80 model II microcomputer system at the University of Ife, Nigeria and the 680 analog/parallel logic computer system of the University of Sussex; U.K. in our digital simulation procedures. We have used the improved Euler’s and Runge-Kutta's methods of numerical integration. We have solved some problems in science and engineering using the digital simulation techniques evolved. These problems are s.d.e. describing: the white noise, the Lagevin's equation, the influence of a rapidly fluctuating density of the earth on the motion of a satellite in a circular orbit, the motion of a rigid body rotating under a random force, the Fokker-Planks equation. We have also considered the convergence of the results and the probable error in the simulation experiments.