Browsing by Author "Akanbi, O. G."

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Advancing industrial engineering in Nigeria through teaching, research and innovation
(Department of Industrial and Production Engineering, University of Ibadan, 2020) Oluleye, A. E.; Oladokun, V. O.; Akanbi, O. G.
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.
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 systems
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.
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.
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.
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.
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.
A mathematical modelling of the intensity of contaminants (C02) on occupancy level of a spacein continuous use
(Inderscience Enterprises Limited, 2008) Oke, S. A; Oyedokun, O. I.; Akanbi, O. G.; Adeyeye, A. D.
This study investigates the Indoor Air Quality (IAQ) of a room apartment and focused on the number of occupants that a space or an apartment can accommodate as a result of increase in the concentration level of the CO2 contaminant present within the space. The law of mass action was applied to generate a relation between the concentration of CO2 produced and the concentration of the reactants (i.e., O2 and CO). A decay equation was also used to relate the variation in the number of occupants with the level of the concentration of CO2 within the space only at steady state conditions.
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.
Mathematical modelling of the traffic congestion problem at a University campus
(2008-04) Oke, S. A.; Lofinmakin, O. O.; Salau, T. A. O.; Akanbi, O. G.; Ofiabulu, C. E.
"The traffic situation at many university campuses in developing countries has been a source of concern to both the school authority and the campus populace. This may be largely due to the increasing enrolment level for university admissions since most employers are certificate-biased instead of skill rewarding. The roads are often congested during the day thereby causing inconveniences to everyone. During the ""peak period"" when vehicular traffic is beyond what the road can contain conveniently, traffic jams occur, which accounts for a great amount of time wastage by commuters. This paper deals with the traffic congestion problem in a university in a developing country. The approach employs mathematical modeling to solve the problem. The principles of flow in fluid mechanics are interpreted at a macro level to the flow of traffic. The model describes the traffic situation, explains the causes and periods of congestion, and proffers a solution to the problem. "
A model for tracking temperature variation in cold and, hot metal working conditions during machining operations
(Springer International Publishing, 2010-01) Oke, S.A.; Oyedokun, I. O.; Momodu, O. S.; Akanbi, O. G.; Oyawale, F. A.
This paper presents a mathematical model that could assist in measuring, monitoring and controlling temperature variation in cold and 'red-hot' metal working conditions of machining. A numerical analysis technique of the temperature distribution, based on the theory of complex applied potential, was carried out using the principles of relationship analysis between the paths of heat supply in Cartesian plane when the heat path supplied to the material is orthogonal. The high level of temperature involved may effectively be predicted if a mathematical relationship that predicts the pattern of temperature distribution in a material is available. A case study example in a machine workshop is given. Simulation experiments are then carried out using Monte Carlo to increase the confidence in decision-making and provide data for significance testing. This was used as an input for testing for significance. Sensitivity analyses were also carried out in order to observe the degree of responsiveness of model parameters to changes in value. In all, five pairs of comparison were carried out among different workpiece materials. There are significant differences between workpiece materials made of steel and copper, copper and zinc, copper and aluminum. However, no significant differences exist in the model behavior of steel and aluminum, steel and zinc. It was observed that parameters are highly sensitive to changes in value. The framework could possibly be applied to milling and surfacing activities in the engineering workshop. This contribution may be helpful to small-scale enterprises that could not afford sophisticated and very expensive facilities.
Modelling energy expenditure of a brick layer at various postures
(Taylor and Francis, 2008) Oke, S.A.; Oshiaji, I. K.; Akanbi, O. G.; Kolawole, A. A.; Oyawale, F. A.
Energy utilisation at work in the labour-intensive building industry is of prime importance to contractors who match people to jobs. This paper provides an insight into modelling energy expenditure in a specific task, namely brick laying in various postures. It therefore takes previous "generic" biomechanical-energy prediction models, and makes the case for applying and adapting broader theoretical models to a specific occupational task. This refinement of established models provides a meaningful and valuable contribution to interpreting and predicting energy expenditure during a defined occupational task -- brick laying. Results obtained show that in the standing position, fewer muscles are brought into action. For the sitting position, the muscles are more relaxed, relieving the bricklayer of stress, but the center of gravity is still lower than the standing position. In the case of squatting, there is a lot of strain in the body by considering the muscles of the arms, legs, and back resulting in more energy released in the body. The bending position has repeated movement of the muscles at the back and the center of gravity varies. Thus, this research of energy expenditure in brick layers may be of interest to ergonomists and those interested in biomechanical-energy modelling.
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.