Browsing by Author "Kehinde, O. O."

Now showing 1 - 2 of 2
  • Item
    Analysis of Students’ Ability Level in Senior Secondary School Certificate Examination Economics Objective Tests (2012-2016) in Ogbomoso, Oyo State
    (Nigerian Journal of Educational Foundation (Published by Faculty of Education, University of Ilorin), 2019) Oladele, Jumoke I.; Daramola, Dorcas S.; Ogunjimi, Mayowa O.; Owolabi, Henry O.; Kehinde, O. O.
    This study aimed at analyzing the ability level of students' in Senior Secondary School Certificate Economics Examination using Item Response Theory (IRT). Using descriptive survey type research design, two research questions and one hypothesis were generated for the study. The study population consists of all four thousand, seven hundred and thirty final year students of Senior Schools in Ogbomoso, Oyo State; out of which sample of one thousand and eighty students were selected using multi-stage sampling technique was drawn. The instruments used for data collection were WAEC, NECO and NABTEB multiple-choice Economics papers which are standardized tests that are presumed to be accurate, reliable and valid. The data collected were analysed using Cronbach 's Alpha method to ascertain the reliability of the test items to provide answers to research question one, descriptive statistics and WinGen IRT software package was used to provide answers to research question two, while the research hypothesis was tested using Analysis of Variance (ANOVA) statistics. The result shows that all three exams were reliable; however, NECO had the highest reliability index of 0.69. Also, the result reveals that, on the average, the examinees were of medium ability, but in 2012 to 2014, the mean abilities in NECO were higher than in WAEC Economics items, while those of WAEC in the same years were higher than those of NABTEB except for 2015 and 2016 where the ability levels of students in NABTEB were found to be higher than that of WAEC even though that of NECO remained the highest of them all. Moreover, the estimates indicate that there is no significant difference in the ability levels of students in 2012 to 2106 in multiple-choice Economics items based on WAEC, NECO and NABTEB standardized examinations (p-values .85, 2.6, .14, .64, and .44). Recommendations were given in line with the obtained results.
  • Item
    Passive Mobile Cellular Network Infrastructure Sharing: An Analysis of Wind Loading on a Multi-Operator Telecommunication Tower
    (Department of Civil Engineering, University of Ilorin, Nigeria, 2017-07) Ehiagwina, F. O; Afolabi, A. S.; Fakolujo, O. A.; Kehinde, O. O.; Oseni, G. M.; Anifowose, J. J.
    In order to overcome challenges militating against the rapid deployment of mobile cellular infrastructure, it is technically and economically crucial for a number operators to share mobile cellular infrastructure such as power supply, base station (BTS) cabin and telecommunication tower. For an efficient tower sharing, an analysis of tower’s wind loading and the tower bending moment have to be performed. In this work, we performed wind loading analyses for a multi-operator mobile cellular network. It was verified that as the number of operators increase, the wind loading value also increases. This work further observed that as the value of the antenna tilt increases, the tower wind loading proportionately increases. However, as the wind direction deviates from the normal, the wind loading reduces slightly. Finally, for six mobile cellular network operators, with total tower height set at 55m, the bending moment at a rare wind speed of up to 67 m/s was evaluated to be. It is vital that the bending moment of the telecommunication tower be lesser than the manufacturer’s specified tower bending moment limit. The results obtained from this research can be used to tighten tower survivability criterion. It will also serve as a useful tool to mobile cellular equipment designers and installers.