Browsing by Author "Oladokun, V. O."

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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.
An application of artificial neural network to maintenance management
(2006) Oladokun, V. O.; Charles-Owaba, O. E.; Nwaozuru, C. S.
This study shows the usefulness of Artificial Neural Network (ANN) in maintenance planning and management. An ANN model based on the multi-layer perception having three hidden layers and four processing elements per layer was built to predict the expected downtime resulting from a breakdown or a maintenance activity. The model achieved an accuracy of over 70% in predicting the expected downtime.
Application of fuzzy logic to the optimal location of public utilities: a case study of pedestrian bridges.
(2012) Oladokun, V. O.; Okesiji, O. O
The level of utilization of many public utilities is, most often, influenced by their locations Huge public funds are spent annually on the provision of several public infrastructures, such as pedestrian bridges, that are grossly underutilized due to their poor location or citing. This study was aimed at developing a fuzzy logic based decision support system for the optimal location of pedestrian bridges in a typical Nigerian city. Various factors and their interactions that affect utilization of any pedestrian bridge were identified and characterized. Utilization data on twenty eight existing pedestrian bridges, spread across two states in Nigeria were obtained and analyzed. The triangle and trapezoidal membership function were used to build a fuzzy inference system modeling the dynamics of utilization. The model was tested with the real life data. Four factors: traffic speed, vehicle traffic volume, proximity to market and proximity to bus stop, among other factors, were prominent in influencing utilization level. The model achieves more than 75% accuracy in deciding the suitability of a location based on level of utilization. It is concluded that the fuzzy logic approach is a veritable decision support tool for public facilities location decision problem.
An assessment of the manufacturing capabilities of Nigerian funiture makers: case study of Lagos, Nigeria
(The Nigerian Institution of Engineering Management, 2011) Oladokun, V. O.; Ojo, A. O.; Sunmonu, S. O.
This study examines the manufacturing capabilities of the Nigerian furniture industry. An extensive review of literature was carried on wood; structure, seasoning types, properties and finishing. Also, a review on wood furniture manufacturing processes, in terms of tools, equipment, design, ergonomics, finishing was carried out. Interview, observation, discussion and survey method were used for data gathering from some selected furniture workshops in Lagos. An assessment of the furniture industry in Nigeria in terms of processes, finishing techniques, aesthetics, tools and equipment, was carried out and compared with standards furniture manufacturing industry in Nigeria in terms of processes from literature and practices obtained in some developed countries. The study concludes that improvement and investment in the areas of equipment, machines, improvement in power supply and a programme to train the local furniture makers are required to improve the output from the sector.
A bi-criteria algorithm for the simultaneous minimization of makespan and number of tardy jobs on a single machine with sequence dependent set-up time
(Maxwell Scientific Organization, 2011) Oladokun, V. O.; Chalres-Owaba, O. E.; Olaosebikan, F. O.
Scheduling models based on efficient resources utilization without sufficient consideration for customer satisfaction or vice-visa is inadequate in many real-life multi-criteria scheduling problems. This work was aimed at the development of a bi-criteria algorithm for the simultaneous optimization of Makespan (Cmax) and Number of tardy jobs (NT) in a single machine problem with Sequence dependent set-up time. An existing single criterion algorithm, the Set Sequencing Algorithm, was adapted to solve the bi-criteria problem, Graphical User Interface (GUI) based software of the new algorithm was developed and its performance was evaluated with a real life problem and 150 randomly generated problems, with problem sizes ranging from between 20 and 150. The values of Crnax and NT of the solution sequences were analysed. The output sequences gave an average reduction of 32.1 0% in both measures of performance compared with the input sequences. The software was also shown to be user friendly. It is concluded that Set sequencing Algorithm is suitable for bi criteria scheduling optimization
Demand management based design of residential solar power supply system: a techno-economic evaluation
(Science Hub, 2012) Oladokun, V. O.; Adeshinyan, S. A.
"With high solar radiation across Nigeria, solar power system can become a viable solution to the Nigeria's electricity power crisis if the problem of high capital cost of solar power supply system can be addressed. In this study the use of demand management based design approach has been explored for reducing the capital cost of residential solar power supply system. Utilities and energy demands of thirty randomly picked homes in selected residential areas were studied. The houses were classified into one, two and three rooms' residential apartments. New energy efficient appliances that can deliver the same or higher utility values as those already in use in these houses were classified into one, two and three rooms' residential apartments. New energy efficient appliances that can deliver the same or higher utility values as those already in use in these houses were identified and proposed as replacement to cut energy demand. Cost analysis of replacement with these energy star appliances was carried out. Solar system designs and associated cost models were developed for both the existing demand system and the proposed energy efficient demand system. For comparative analysis, appliances replacement cost was factored into the associated solar system capital cost. The average total energy demands were 1255W, 1785W, and 2185 for one, two, and three bedroom flats respectively while equivalent demands for energy efficient system are 389W, 820W, and 851W respectively. The cost of designing and installing a solar power with the replaced appliances exhibits a significant reduction of 64.88%, 64.5% and 62.16% for the one, two and three rooms residential set up respectively. We conclude that an integrated demand management design approach is very useful in reducing the capital cost of residential solar systems. "
Development of a materials requirement planning(MRP) software
(Akamai University, Hilo, HI, USA, 2012-05) Oladokun, V. O.; Olaitan, A. O.
"Lack of affordable, efficient, and user friendly inventory management tools, for adequate planning has been identified as a major cause of the high inventory cost in many Nigerian manufacturing firms. This study focuses on the development of a Materials Requirements Planning (MRP) that can be used by the local industries for inventory management in a job shop manufacturing environment. Four types of lot sizing techniques were analysed and MRP algorithms developed for each of these lot-sizing techniques. A process of Bill of Materials (BOM) explosion was developed and incorporated. An overall flow chart of the MRP process sequences and a graphical user interface (GUI) based software of the MRP process was developed using Microsoft Visual basic. Evaluation tests of the software were carried out using various products ranging from those with simple structure of single product to complex structure with multiple products sharing common items. The software was shown to be user friendly and allow for easy data input and output allowing for product structure to be saved and retrieved for future planning. "
An ergonomic and safty evaluation of footwear used by male industrial workers in Nigeria: a case study
(Besade Pub. Press, 2007) Oladokun, V. O.; Onwusika, N. I.
This study focuses on footwear used by Nigerian industrial workers. The suitability and comfort ability of these shoes used in a typical Nigerian factory were assessed based on their response to some well-structured questionnaire. Some important features of the shoes were compared with internationally recommended standards. The result shows that 62% of the respondents' shoes are suitable. These are mostly shoes that are light weight, low heeled made of leather material and steel toed, though some of them are not steel toed. When compared with the standard features and characteristics, it is observed that about 60% complies with the Internationally accepted standards of EN 345, EN 346 and EN347 for safety shoes, protective shoes and work shoes respectively.
Finishing and aesthetic capabilities of Nigerian metal fabrication companies:case study of Ibadan, southwest, Nigeria
(The Nigerian Institution of Engineering Management, 2011) Oladokun, V. O.; Adeboyejo, A. A.
Poor finishing and aesthetic capabilities of metal fabrication companies in Nigeria have been identified as a major cause of the poor acceptance of locally fabricated products. This study was aimed at assessing some finishing and aesthetic capabilities of Nigerian companies.Five companies were selected for analysis. Their equivalent imported substitutes were identified for comparison.Ten basic operations(painting, electroplating, metal spraying, lapping, super finishing, abrasive belt grinding, buffing, parkerizing, polishing and chemical conversion coating) for accomplishing the three finishing processes (surface cleaning, surface smoothing and surface coating) on a given metal product were identified. Standard equipment types required for the operations were identified from the literature. The fabrication methods, practices and equipment types used by the companies to carry out the operations were compared with industry standards. The physical structures and aesthetics of the product were compared to the imported substitutes. The manpower level of each company based on the age, educational status, years of experience, familarity with finishing operation of workers was also evaluated. On the average the companies make only 40% of the standard finishing operation identified from the literature, 50% of the workers have post secondary school qualification and 50% have over 5 years experience on the job. Investment in equipment and technology is generally poor. It is concluded that comparatively, local metal fabricators lack the required finishing and aesthetics capabilities in area of equipment and manpower skills.
Finishing and aesthetic capabilities of Nigerian metal fabrication companies:case study of Ibadan, southwest, Nigeria
(The Nigerian Institution of Engineering Management, 2011) Oladokun, V. O.; Adeboyejo, A. A.
Poor finishing and aesthetic capabilities of metal fabrication companies in Nigeria have been identified as a major cause of the poor acceptance of locally fabricated products. This study was aimed at assessing some finishing and aesthetic capabilities of Nigerian companies.Five companies were selected for analysis. Their equivalent imported substitutes were identified for comparison.Ten basic operations(painting, electroplating, metal spraying, lapping, super finishing, abrasive belt grinding, buffing, parkerizing, polishing and chemical conversion coating) for accomplishing the three finishing processes (surface cleaning, surface smoothing and surface coating) on a given metal product were identified. Standard equipment types required for the operations were identified from the literature. The fabrication methods, practices and equipment types used by the companies to carry out the operations were compared with industry standards. The physical structures and aesthetics of the product were compared to the imported substitutes. The manpower level of each company based on the age, educational status, years of experience, familarity with finishing operation of workers was also evaluated. On the average the companies make only 40% of the standard finishing operation identified from the literature, 50% of the workers have post secondary school qualification and 50% have over 5 years experience on the job. Investment in equipment and technology is generally poor. It is concluded that comparatively, local metal fabricators lack the required finishing and aesthetics capabilities in area of equipment and manpower skills.
A framework for local production of a low cost plastic injection mould system
(2011) Oladokun, V. O.; Rabiu, K. O.
"The development of a framework for the local production of low-cost injection moulds, using inputs and technical skills available within a typical Nigerian city is the focus of this study. The plastic casing of an auto-battery has been used as the case study product. Product analysis of the casing and casing mould were carried out to identify features amenable to simplification. For the injection mould design an injection pressure of 83MPa was used for the strength of material analysis. Materials availability survey and analysis were carried at the multipurpose metaI and machinery market located in Agodi, Ibadan, Oyo State, Nigeria. A survey of metal fabrication related skills was carried out in the same market to identify artisans with skills relevant to the proposed production processes. A production process framework supportable by the identified local skills- and materials was thereafter developed. Scrap medium carbon flat sheet was identified as a suitable material. Oxy-acetylene welding was identified as suitable for cutting while arc welding was found adequate for joining. The local artisans were found to be capable of producing the required product if given close supervision. An exploratory evaluation of the mould system was carried out using an improvised low pressure manually operated injection mould. Test, using locally available recycle plastic materials, indicated better plastic formation with a homogeneous polypropylene plastic than heterogeneous polypropylene plastic. It is concluded that plastic mould system is feasible for local fabrication. "
Harmonious song-list generation: anapplication of the sequence dependent machine set up time problem model
(International Research Publication House, 2011) Oladokun, V. O.; Charles-Owaba, O. E.; Nzeribe, T. M. C.
Song- list generation, a crucial component of m us IC information retrieval system. has been carried out based on users experiences and bias with no quantitative method to guarantee the generation and repeatability of harmonious arrangements. In this study, the problem of generating harmonious song-list has been modelled as a Single Machine Set-up Problem (MSP) and solution software developed. Music factors that affect user perception and cognition of a smooth transition were identified through interview of experts and literature search. These factors were transformed into suitable quantitative scale for calibration. Thirty (30) Nigerian songs were selected for analysis. A cost matrix was developed for the songs. A MSP Solution algorithm, the Set-sequencing Solution Algorithm (SSA) was adopted as the solution procedure. An interactive version of the SSA was developed using the VB.NET. Using randomly generated song-lists as input sequences into the software. new song-list was generated and compared to the input sequence. An improvement on total song list harmony of about 57% was obtained using the MSP on thirty (30) songs. The software was seen to be user friendly. It is concluded that the new software is a useful tool for church worship and the entertainment industry in general.
Improving capacity utilization through material handling automation: a case study of a food processing plant.
(Besade Pub. Press in assocaition with the Nigerian Institute of Engineering Management, 2004) Oladokun, V. O.; Eze, A. I
This study is about the use of automated material handling system to eliminate bottlenecks on production line in order to achieve higher system capacity utilization. It was applied to the milling plant of a food processing company. Detailed study of the milling plant work system's parameters was carried out to give a basis for the selection of a suitable new transfer system. Facility layout analysis to determine floor space requirement as well as work system design analysis and cost/ benefits analysts were also used. A pneumatic conveyor system has been designed to replace manual handling in a critical portion of the flow line. Costs and benefits analysis indicate that an overall increase qf 30% in revenue at a cost of 8.4% increase in input resources is achievable if the proposed subsystem is installed. Productivity will also increase by 29% by the proposed automation.
An integer linear programming model of a university course timetabling problem
(Akamai University, Hilo, HI, USA, 2008) Oladokun, V. O.; Badmus, S. O.
In this study, the combinatorial problem of university course timetabling of an Engineering Faculty of a Nigerian university (the University of Ibadan) was addressed. The problem of assigning lecturers, rooms, and courses to fixed timeslots, normally, a week, while satisfying a number of problem-specific constraints was modeled as an Integer Linear Programming (ILP). The problem constraints have been divided into hard constraints and soft constraints. While the hard constraints constitute the problem constraints, the minimization of the violation of the soft constraints constitutes the objective function. Being an NP-Hard problem, a heuristic was developed and implemented manually. Ten (10) solutions were generated manually from 10 runs with the newly developed search technique. An analysis of the performance of the solutions shows that the proposed heuristic is promising.
Optimizing investments' cash flow: a scheduling approach.
(Besade Pub. Press in assocaition with the Nigerian Institute of Engineering Management, 2003) Oladokun, V. O.
In this paper, the problem of optimising cash flow so as to enhance the financial feasibility of a multipart project is considered. The problem has been modelled as a single machine scheduling problem. Several sectors of the Nigerian economy where this problem is encountered are also discussed. A real life problem was solved on a PC using an electronic spreadsheet.
Options for the Nigeria electricity tariff review: cost or service reflective tariff?
(Department of Industrial and Production Engineering, University of Ibadan, 2020) Akinlabi, K. A.; Oladokun, V. O.; Alexander, A. O.
The improvement in the Nigerian electricity value chain has not been visible after seven years of partial privatization of the sector as the government continues to subsidize tariffs to avert the total collapse of the sector. The electricity distribution companies tagged the weak link in the value chain, have been challenged with inherited dilapidated infrastructure and poor revenue generation. The Nigeria Electricity Supply Industry is currently considering service reflective tariff options after her inability to implement a cost-reflective tariff in the sector since privatization in 2013. The electricity value chain is presently challenged with poor cash flow due to customer payment apathy, perceived corruption in the system, unavailability of a cost-reflective tariff which resulted in poor remittance to the value chain by the distribution companies. This paper reviews the power sector evolution and the reforms in the sector, the performance of Nigeria Electricity Regulatory Commission regulations, the concepts of the cost, and service reflective tariff. The paper recommends a cost-reflective tariff option with strict regulatory performance monitoring of all the value chain participants in the sector.
Predicting students academic performance using artificial neural network: a case study of an engineering course
(Akamai University, Hilo, HI, USA, 2008) Oladokun, V. O.; Adebanjo, A. T.; Charles-Owaba, O. E.
"The observed poor quality of graduates of some Nigerian Universities in recent times has been partly traced to inadequacies of the National University Admission Examination System. In this study an Artificial Neural Network (ANN) model for predicting the likely performance of a candidate being considered for admission into the university was developed and tested. Various factors that may likely influence the performance of a student were identified. Such factors as ordinary level subjects' scores and subjects' combination, matriculation examination scores, age on admission, parental background, types and location of secondary school attended and gender, among others, were then used as input variables for the ANN model. A model based on the Multilayer Perception Topology was developed and trained using data spanning five generations of graduates from an Engineering Department of University of Ibadan, Nigeria's first University. Test data evaluation shows that the ANN model is able to correctly predict the performance of more than 70% of prospective students. "
A set of sequencing heuristic and the computer code for the TSP.
(1999) Charles-Owaba, O. E.; Oladokun, V. O.
This paper proposes a set sequencing heuristic solution for the travelling salesman problem (TSP). It attempts to first select, preferably a set of M smallest elements of the TSP matrix and then form a sequence. A computer code of the procedure was developed in Fortran 77 and used to examine its efficiency and relative effectiveness. It was found to be as effective as, but more efficient than the best of the nearest neighbour heuristics.
Small scale production of auto-battery in Nigeria:an engineering economic model.
(2009) Oladokun, V. O.; Adekunle, D. O.
"This work is aimed at determining the feasibility of manufacturing automobile batteries on a small scale Level. It involves an economic evaluation directed at the typical 12V, 60Ah car battery. A process analysis was done with a view to determining the scalability of the processes. A review of relevant literature gives insights on the product structure and workings, material interactions, process requirements and the various manufacturing strategies and their respective benefits The process is designed with a bias for outsourcing, a growing trend in the direction of specialization and agile product development. Thus, the process is designed for assembly as a parallel/flow line hybrid work system. Next, economic models are developed to assess costs, profit, revenue and optimal production volume. Also, breakeven and Payback Period models are developed for determining the viability of the venture.It was found that with 11 workers, the facility yields up to 1173 units of car battery per month. This requires an initial capital investment of N1, 132,160. At an initial price of N 5,500, the product is expected to generate monthly revenue of N6,450,830 at full running capacity. Thus, a profit margin of N 3,015,340 was obtained, amounting to 46.7% of total revenue. Breakeven occurs at a demand of 121 units, which is 10.3% of the monthly production capacity. This study shows the potentials and entrepreneurial opportunities of investing in the small scale manufacture of engineering products. "
A subtour-free set-sequencing algorithm based computer software for solving the machine set-up problem
(2007) Charles-owaba, O. E.; Oladokun, V. O.
The machine set-up problem (MSP) is that of determining an optimal sequence that a set of N operations will be performed by a general- purpose facility. In order to minimize tile total cost/time of re-setting the facility. Though the MSP is experienced in many small scale industrial situations many of the existing algorithm are programmed to run on super computers or massively parallel computer processors which are often not available for small scale industrial environment in developing economies. In this study a Subtour-free Set Sequencing Algorithm based software for solving real life medium size machine set-up problem on personal computers was developed and tested The computational time curve exhibited a polynomial growth for the range of problems solved and the solution system was shown to be practicable