To achieve some level of Quality of Service (QoS) assurance, a network usually has Service Level Agreements (SLAs) with its users and neighboring domains, which describe the QoS level the service provider is committed to provide and the amount of traffic users or neighboring domains are allowed to send. An interesting and important question arises as to whether a flow is still conformant to its...

The subject of this paper is determining optimal replacement decisions for components under stochastic deterioration. Using the discrete renewal theorem, three cost-based criteria for comparing maintenance decisions over unbounded horizons are determined in Sec. 2: (i) the average costs per unit time, (ii) the discounted costs over an unbounded horizon, and (iii) the equivalent average costs pe...

The paper presents a stochastic gamma process model to account for both population (i.e., sampling) and temporal variability associated with a degradation process that typically increases the probability of failure with the aging of a structure. The proposed method is more versatile than the random-variable degradation rate model commonly used in the structural reliability literature. The reaso...

The existing stochastic models for deterioration of reinforced concrete structures is extended by adding modelling of “loss of bond” due to corrosion between the reinforcement bars and the surrounding concrete.

Further to the proposal and application of a stochastic methodology and the resulting first exit time distribution function to life table data we introduce a theoretical framework for the estimation of the maximum deterioration age and to explore on how “vitality,” according to Halley and Strehler and Mildvan, changes during the human lifetime. The mortality deceleration or mortality leveling-o...

*Correspondence: [email protected] 3Department of Statistics, Ewha Womans University, Seoul, 120-750, Korea Full list of author information is available at the end of the article Abstract In the present paper we consider ageing properties in a deterioration model in which the stochastic process measuring deterioration is a process with independent increments. Preservation of increasing and decre...

-An inventory model for deteriorating items and shortages with finite production rate and stochastic demand rate is developed when the supplier offers delay period to the retailer for due payment against purchases and the retailer in turn extends the trade credit offer to its customers. This policy of passing on of the credit period is well known as two-level of credit financing. Items in the s...

The time-dependent reliability analysis to model age-related deterioration is necessary to support strategic planning and optimization of civil engineering infrastructure systems. The paper presents a stochastic gamma process model to account for temporal variability associated with a deterioration process and its impact on the optimal age of replacement. The proposed method is more versatile t...