Wind energy has shown significant growth in terms of installed power the last decade. However, one most critical problems for a wind farm is represented by Operation and Maintenance (O&M) costs, which can represent 20–30% total costs related to generation. Various monitoring methodologies targeted identification faults, such as vibration analysis or oils, are often used. they have main disa...

Maintenance costs of Information Systems (ISs) are high and are growing. Part of the costs come from low software quality. The quality of software can be measured when it is maintained. By improving the quality of maintenance prone modules future maintenance costs may be lowered for those modules. In this article we will discuss how to measure software quality and we will also present a prototy...

Big data from very large fleets of assets challenge the asset management, as the number of maintenance strategies to optimize and administrate may become very large. To address this issue, we exploit a clustering approach that identifies a small number of sets of assets with similar reliability behaviors. This enables addressing the maintenance strategy optimization issue once for all the asset...

Maintenance is a natural and necessary part of the system life cycle and its costs. It is important to control where time and money are spent and what kind of maintenance is performed. For this purpose it is necessary to be able to measure both maintenance, the efforts and costs, and the quality factor maintainability. Such measuring facilitates planning and steering the maintenance work in inf...

preventive maintenance scheduling of generating units is addressed as a long-term scheduling in power system studies aiming to increase the reliability incorporating cost reduction. it consists of knowing which generating units should be shut down for regular safety inspection. in this paper, a new formulation of preventive maintenance scheduling associated with cost reduction index (cri) is pr...

BACKGROUND Multiple myeloma (MM) is a cancer caused by malignant plasma cells that accumulate mostly in the bone marrow. In Canada, the most common maintenance therapy options after autologous stem cell transplant (ASCT) are bortezomib and lenalidomide. OBJECTIVE To determine the incremental cost between bortezomib and lenalidomide maintenance therapies for patients with MM post ASCT. METHO...

This paper investigates the effects of preventive-maintenance cost functions on the optimal preventive-maintenance policy for a leased product with Weibull life-time distribution. During the lease period, any product failures are rectified by minimal repairs and may incur a penalty to the lessor, if the time duration for performing a minimal repair exceeds a pre-specified time limit. To reduce ...