This article presents an analysis of maintenance costs and policy critical infrastructure systems, considering the case imperfect repair. The a multistate approach repairs, are analyzed with reference to renewal stream process theory. Availability characteristics repairable systems non-negligible renovation time, necessary for cost analysis, determined based on classical We assume that system i...

In Australia, railway track maintenance costs comprise between 25-35 percent of total freight train operating costs. Track maintenance planning models have been shown to reduce maintenance costs by 5 to 10 percent though improved planning. This paper describes a model which has been developed to deal with the track maintenance planning function at the medium to long-term levels. This model simu...

An important aspect of infrastructure management is the scheduling of maintenance tasks. That implies the allocation of tasks to different crews or machines and the determination of an execution order. To this end, different aspects have to be considered. On the one hand, the maintenance operator is interested in reducing the direct maintenance costs. On the other hand, priorities must be consi...

Abstract This paper addresses the questions: How to calculate cost of a start/stop cycle? running one hour outside normal operating range, e.g., on part load? The presents model for calculation individual hydropower units comprising both direct costs incurring at each cycle, and indirect because reduced rehabilitation intervals main components. fundamental assumption is that frequent start-ups ...

Context: Verification and validation (V&V) activities make up 20 to 50 percent of the total development costs of a software system in practice. Test automation is proposed to lower these V&V costs but available research only provides limited empirical data from industrial practice about the maintenance costs of automated tests and what factors affect these costs. In particular, these costs and ...