scholarly works
Permanent URI for this collectionhttps://repository.ui.edu.ng/handle/123456789/473
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Item Occupational lead exposure in printing presses: an analytical approach(Akamai University, 2008) Oke, S. A.; Phillips, T. E; Kolawole, A.; Ofiabulu, C. E.; Adeyeye, D. A.Lead absorption poses a great threat to the health of workers in printing presses where commercial publishing is done. A case example is the commercial printing operations in Lagos, Nigeria. Since regular exposure to lead dusts could result in lead poisoning, complications that could cause death of victims, monitoring and controlling lead absorption of operators is essential for the maintenance of workers’ health and for the avoidance of the risk of incurring heavy losses due to litigation. The purpose of this paper is to model the process, rate, and quantity of lead absorption in operators of printing presses. Measurements of lead absorption are made and compared to standards in individuals for control purposes. Two approaches are used. The first shows the risk of being poisoned by lead. The second approach relates lead poisoning to the rates of intake of lead into the body and its elimination out of the body. This model viewed the absorption of lead as a cycle and applied the continuity equation to this cycle.Item Modelling of energy expenditure at welding workstations: effect of temperature on work performance(Taylor and Francis, 2008) Oke, S. A.; Obioma, J. U.; Akanbi, O. G.; Adekunle, K.; Oyawale, F. A.The welding workstation usually generates intense heat during operations, which may affect the welder's health if not properly controlled, and can also affect the performance of the welder at work. Consequently, effort to control the conditions of the welding workstation is essential, and is therefore pursued in this paper. This paper develops a mathematical model that maximises the work output while minimizing energy consumption at the welding workstation. Particular emphasis is placed on the effect of temperature on work performance. The important principle of conduction is applied through the human flesh that experiences temperature changes at the welding workstation. The welder-environment interaction is investigated with a focus on the welder's link and their relationship with blood flow. The results show that the blood in the arteries loses heat to the blood in the veins, and is aided by convection in the veins, Further heat losses occur in the skin layer of fat and muscle, and finally to the air. The study hopes to stimulate greater productivity and optimised resource utilisation. Thus, the Safety, Health and Environment (SHE) manager can assist in controlling the surroundings for optimal welder's comfort.Item Mathematical modelling of lead assimilation by printing press operators in a poor indoor air quality environment(Inderscience Enterprise Limited, 2008) Oke, S. A.; Ahmed, A. O.; Akanbi, O. G.; Oyawale, F. A.; Ofiabulu, C. E.Most printing presses in developing countries are located in buildings with inadequate natural and mechanical ventilation such that the press operators work for major hours in poor indoor air quality buildings, which expose them to a wide range of health hazards such as lead poisoning. Understanding how poor air quality affects the operator's body system is studied using a methodology involving the principle of diffusion and the law of mass action. A hypothetical press in Nigeria is used as a case study to illustrate the workability of the model which may be of value to health inspectors to printing presses.Item Mathematical modelling of the road bumps using laplace transform(Centre of Professional Research Publications, 2007) Oke, S. A.; Salau||Adeyefa, O. G; Akanbi, O. G.; Oyawale, F. A.The contribution of this paper to traffic engineering is the application of Laplace Transform to the quantification of speed control in the modelling of road bumps with hollow rectangular shape. The paper simulates the behaviour of a vehicle when passing over a series of bumps. In many countries the current practice used for lowering the vehicle speed is to raise road bumps above the road surface, if a hollow bump is used it may be economical and offers other advantages over road bumps raised above the road surfaces. The method models the vehicle as the classical one-degree-of-freedom system whose base follows the road profile, approximated by Laplace Transform. Then, a traditional vibration analysis is carried out and the isolation factor is calculated. A case study application is presented to substantiate the model developed. This case indicates how much difference the current model has compared to other existing models. Therefore, a relationship is established between the characteristics of the road profile, and the vehicle vibration response. Thus, the model's impact on the vehicle speed control is specified.Item An inflation-based maintenance profitability model(Inderscience Enterprise Limited, 2008) Oke, S. A.; Oyedokun, I. O.; Akanbi, O. G.; Oyawale, F. A.The maintenance profitability problem is an important but emerging concept of maintenance performance measurement that views the maintenance function as a value adding subsection of the organisation. The service provided by the maintenance system to production is charged as a price, which results in the monetary contribution of the maintenance department to the organisation. In the same way, as production would add financial benefits to the organisation the maintenance system is portrayed as adding profit to the organisation. In this work, we present a mathematical model that calculates the maintenance profitability of an organisation under the condition of inflation using a composite mathematical function. It is concluded that viewing maintenance from a profit-making orientation provides a challenge to the maintenance team, thus driving them towards improved performance.Item Development of a performance measurement system for manufacturing systems(Inderscience Enterprise Limited, 2008) Oke, S. A.; Oyedokun, I. O.; Akanbi, O. G.; Oyawale, F. A.Taylor and Davis total productivity model has significant advantage over the traditional and more commonly used productivity models - its holistic nature. The model incorporates elements of net sales, inventory changes, wages and salary, investor's contribution, working and fixed capital. This paper presents a unique approach in the determination of the total factor productivity for a manufacturing organisation. This study is motivated by the dearth of models comprehensive enough to cover the major aspects of business apart from the usual input-output approach of productivity analysis which is limited to the output items and material/non-material resources. The results obtained clearly demonstrate the feasibility of applying Lagrange multiplier in optimising the variables and parameters of the model. The research has implications for decision making in several dimensions primarily it aids the utilisation of optimal solutions in arriving at decisions. This would avoid suboptimal decision making and promotes implementation of optimal decisions. This study is new, in that, it presents an enhanced version of a model that has been available to researchers several years back.Item Development and application of an inflation-based productivity model(Akamai University, Hilo, Hawaii, 2007-11) Oke, S. A.; Oyedokun, I. O.; Akanbi, O. G.; Oyawale, F. A.The paper presents a productivity model with an inflation component based on an established productivity measurement theory. The motivation for writing this paper is the need for conflict resolution at the implementation of productivity incentive programs. A common complaint from trade unions and organizations is that productivity is inaccurately assessed when the traditional input-output approach is utilized. The support for this argument is that a general rise in prices of materials utilized for production activities, without corresponding added values to the materials takes away the work group productivity efforts. This does not reveal the true measure of productivity. From the results obtained, there is a significant difference between the values obtained when the traditional productivity formula is used to compute the performance of a work group compared with the formula proposed in this work. This may be a strong point and a justification for the trade union argument. The limitation of the study is the difficulty that exists in monitoring the inflation values of the multiple products utilized as inputs into the production activities. For computational activities, a factor is chosen. The novelty of the model could be traced to the fact that it is the first time that such an approach and a systematic analysis would be made through the incorporation of the inflation factor into the productivity models.Item Cost analysis in the implementation of ISO quality system in a petroleum refinery(Inderscience Enterprise Limited, 2009) Oke, S. A.; Abudu, A. J.; Akanbi, O. G.; Oyawale, F. A.The substantial amounts of financial and non-financial resources invested annually on petroleum refinery operations justify the need for documentation on the cost of implementing ISO quality systems ill refineries. The experience of ISO quality system implementation cost analysis in a petroleum refinery in a developing country is reported with a combination of mathematical model and application. The concept of strain as a function of growth in the physical sciences is adopted to conceptualise the growth phenomenon in the ISO organisation. Practically, developing a quantitative approach in evaluating cost of ISO implementation would help the manager in relying on scientific fact instead or intuition. The approach is new and has the potential for helping the top management in planning the strategy and allocating necessary funds for effective implementation of ISO quality systems.Item The combined application of quality function deployment and pareto analysis for hotel services improvement(Inderscience Enterprise Limited, 2008) Oke, S. A.; Ofiabulu, C. E.; Banjo, A. A.; Akanbi, O. G.; Oyawale, F. A.This paper discusses the combined application of Quality Function Deployment (QFD) and Pareto Analysis (PA) to hotel services. This paper improves the current quality management practices in a case study hotel. This results into increased customer patronage and improved hotel profit margin. PA is applied as a prioritisation tool for the purpose of financial investment decision. The study may be applicable to other hotels. It could also significantly affect the goodwill of the organisation as well as its profit margin. This paper is new, in that it appears to be the first application of Pareto cum QFD principles in hotel services, and a new way of prioritisation and quality improvement in hotels systemsItem Application of hybrid structural interaction matrix to quality management(Inderscience Enterprise Limited, 2008) Oke, S. A.; Ayomoh, M. K. O.; Akanbi, O. G.; Oyawale, F. A.This paper applies the concept of Hybrid Structural Interaction Matrix (HSIM) to the management of quality in a manufacturing organisation. The application is motivated by the need to evolve alternative prioritisation tools in quality management. A process, which could be used to analyse a specific situation, was presented by showing how Structural Interaction Matrix (SIM) and Hierarchical Tree Structure Diagram (HTSD) could be used to create a model. The result indicates the feasibility of applying the model in a specific situation in some useful insight into the problem solution. This research has serious implications for management in manufacturing organisation in that it saves tremendous energy and cost that could be expended on alternative prioririsation techniques due to minimization of time expended in seeking expert of opinion on the issue. This paper is new in that it shows a new dimension about thinking on quality management.