In this paper two similar models for the maintenance of a production-inventory system are considered. In both models, an input generating installation supplies a buffer with a raw material and a production unit pulls the raw material from the buffer. The installation in the first model and the production unit in the second model deteriorate stochastically over time and the problem of their opti...

This paper considers a condition-based maintenance (i.e. CBM) model for the hydro generating unit in the deregulated power system. As the downtime cost of the generating unit varies according to the time-varying electricity price, the economic dependence among the critical component of the generating unit is dynamic. In this paper, the proposed DynamicEconomic-Dependence and proportional hazard...

Many maintenance policies have been proposed for refreshing a warehouse. The difficulties of selecting an appropriate maintenance policy for a specific scenario with specific source characteristics, user requirements etc. has triggered researcher to develop algorithms and cost-models for predicting cost associated with a policy and a scenario. In this dissertation, we develop a benchmarking too...

A continuously monitored system is considered, that gradually and stochastically deteriorates according to a bivariate non decreasing Lévy process. The system is considered as failed as soon as its bivariate deterioration level enters a failure zone, assumed to be an upper set. A preventive maintenance policy is proposed, which involves a delayed replacement, triggered by the reaching of some p...

In this paper, we develop a joint quality control and preventive maintenance policy for a production system producing conforming and non-conforming units. The considered system consists of one machine which must supply another production line operating on a just-in-time basis. According to the proportion l of non-conforming units observed on each lot and compared to a threshold value lm, one de...

A major problem in many practical applications of case-based reasoning (CBR) and knowledge reuse is how to keep the case bases concise and complete. To solve this problem requires repeated maintenance operations to be applied to case bases. Different maintenance policies may result in case bases with very different quality. In this article, we present a case-addition maintenance policy that is ...

This paper presents a maintenance policy for a system consisting of two units. Unit 1 is gradually deteriorating and is subject to soft failure. Unit 2 has a general lifetime distribution and is subject to hard failure. Condition of unit 1 of the system is monitored periodically and it is considered as failed when its deterioration level reaches or exceeds a critical level N . At the failure ti...

In this paper, an integrated approach for production scheduling and maintenance is proposed for a multi-component system. The model in this paper is based on the selective maintenance policy. The objective is to obtain a minimum cost solution with availability, allowable maintenance time as constraints. The optimization procedure using the proposed integrated approach results into maintenance d...

In this paper, we consider a production system that must achieve a set of different requests during a finite horizon period. Among the various requests proposed, the objective is to select those to be satisfied so as to maximize the net profit. A sporadic maintenance policy is studied to minimize the maintenance costs by the achievement of perfect preventive maintenance actions after the comple...

As case-based reasoning systems are deployed in real-world situations the issue of case maintenance becomes more and more critical. Uncontrolled case-base growth can cause serious performance problems as retrieval efficiency degrades and incorrect or inconsistent cases become increasingly difficult to detect. This paper surveys recent progress in the area of knowledge maintenance, and propose a...