DEPARTMENT OF INDUSTRIAL AND PRODUCTION ENGINEERING
Permanent URI for this communityhttps://repository.ui.edu.ng/handle/123456789/472
Browse
21 results
Search Results
Item The traveling salesman problem: algorithms, sub-tours and applications in combinatorial optimization(Department of Industrial and Production Engineering, University of Ibadan, 2020) Oladokun, V. O.; Odedairo, B. O.; Atitebi, O. S.The importance of the traveling salesman problem (TSP) in combinatorial optimization and its application and adaptability to numerous real-life problems has led to the development of a wide range of algorithms. A major issue in the development of TSP algorithm involves how to handle the large number of subtour eliminating constraints which contribute to the exponential growth of computational time associated with TSP algorithms. In this chapter, basic concepts, development and many numerous research efforts of Professor O.E. Charles-Owaba on TSP were discussed; some of his works on the concept of the TSP set sequencing algorithm were highlighted.Item 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.Item 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.Item 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.Item 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. "Item 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. "Item 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.Item 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. "Item 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.Item 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
- «
- 1 (current)
- 2
- 3
- »