| Modeling a noisy time series requires the dual estimation of both the model parameters and the underlying clean time series. Most approaches estimate the model parameters by minimizing the mean squared prediction error, but estimate the time series by minimizing another cost function. We justify the use of the same maximum-likelihood cost for both parameter and time series estimation, and pre...

This paper addresses the problem related to the adoption of an extended warranty period for randomly failing products sold under warranty. The possibility of buying an extended warranty for a given additional cost is often offered to the buyer by the manufacturer. The buyer has then to decide to take the extended warranty or not when purchasing the product. We develop in this paper a mathematic...

Maintenance reduces the occurrence of failures of a component (or IT product) and also extends its useful life. This way the time to dispose of such a component may be delayed and this reduces the rate at which greenhouse gases enter into the food chain and the atmosphere. It will be helpful to produce set of maintenance intervals for such component at which its extended useful life and cost ar...

This paper analyses life cycle cost for equipment protected by both base and extended warranty policies from a consumer’s perspective. We assume that the equipment have two types of failures: minor and catastrophic. A minor failure can be corrected by a minimal repair whereas a catastrophic failure can only be removed by a replacement. The equipment is assumed to be maintained at no charge to t...

In this paper, we extend the recently presented QoS routing scheme called Pre-Computation based Selective Probing(PCSP) to the practical environment where the state information available for the routing decision is not precise. This extended PCSP algorithm pre-computes the QoS variations as well as the cost and QoS metrics of the least-cost and bestquality paths, taking into account the impreci...