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1

Transportation model under weighted insecurity

Kareem B.

Research in Logistics & Production

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2018

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Vol. 8, No. 3

237--249

EN

The conventional linear programming based transportation model in the previous studies was examined and found to be deficient in practice. Modified transportation model has been developed to include some predetermined salient factors such as road safety and security. In the real sense these factors are accidental and they can occur without prior notice. Besides, weather change is also critical to transportation insecurity. In this paper a new transportation scheme’s model was deve- loped to take into consideration the incidental occurence nature of the insecurity factors as applicable elsewhere. The weighted loss cost function due to the insecurity factors on roads was formulated using Analytic Hierarchy Process (AHP) and its outcome was integrated into the conventional transportation model. The cost savings from three models namely conventional, modified-conventional, and the current (re-modified) were compared using the petrol’s transportation schedule of the Nigerian petroleum industry. The results showed that the re-modified transportation model was not in good agreement with the other two in term of flexibility. The findings showed that the cost price of the item has a wide margin depending on the incidence and the weight of insecurity.

2

Optimizing plant's maintenance cost using strategic switching approach

Kareem B.

Research in Logistics & Production

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2013

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Vol. 3, No. 3

193--212

EN

Inadequate supply of public electricity in Nigeria has affected the productivity of many manufacturing industries. Electric generating plant is being used as a standby supplement to public electricity at outage hours. The high cost of running and maintenance of this generating plant has adversely affected the sustainability of the industry. A maintenance strategic switching approach was developed to minimize the cost of running the electric generating plant in the industries. Maintenance strategic switching and cost control parameters are preventive, repair/corrective and replacement. The maintenance cycle for each of the components served as tool for the determination of cumulative sum of maintenance cost from which the minimum cost schedule was selected. Data collected on power machinery from a water generating company was used to test the model. The least probability of failure (non-progressive deterioration) for components was recommended for adoption. There was a significant saving in maintenance cost of components under the non-progressive deterioration. In the 750 schedule, while the cost of maintenance with progressive deterioration was N149, 677, that of non-progressive, least failure probability was N75, 960.35 with savings of 49.25% over the former. Therefore, most economic schedule was 750 cycles. This scheme predicted for the organization the optimal maintenance strategy to utilize.

3

Development of a flexible process layout for a Nigerian beverage industry

Kareem B., Oke P. K., Lawal A. S.

Research in Logistics & Production

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2013

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Vol. 3, No. 1

37--47

EN

Product design is changing everyday as a result of changing in taste of the customers. Production layout must be flexible to cater for these changes. Production layout is flexible if it can accommodate change in flow of workers, material and machines in compliance with the new product demand. In this study, flexible process layout was developed for a Nigerian beverage industry to take care of future change in product design. In the industry, flexibility was considered in redesigning of old production layout in the areas of industrial facility, and operational planning. It was discovered that old layout was deficient in the area of flexibility by 90% of the set standards of the criteria for plant layout. The findings have indicated that the flexibility in plant layout is cardinal in combarting the challenge of changing industrial environment.

4

Modelling fatalities of road accidents in Nigeria

Kareem B., Oke P. K., Lawal A. S.

Research in Logistics & Production

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2012

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Vol. 2, No. 3

259-271

EN

Preponderance of road accidents is one of the major causes of death in Nigeria, but the fatality of these accidents is unknown. In this study, data on casualties of the road accidents in Nigeria are collated, statistically analysed and modelled for predicting fatality of the accidents. The strategies of minimising rise in fatality of road accidents were proposed. The results obtained showed that the fatalities of the road accidents have polynomial relationships with the population of the road users, or time. The highest annual accident fatality probability of 0.17 was obtained over the total population of the road users. The result from combined modelling of traffic population and time showed that the accident fatalities will rise in future unless roads and drivers are well cultured. The findings would be useful for demographers, safety and health workers in their planning.