In general, most human physiological organs systems, which are constructed by collecting more than one part to perform either single or multiple functions. In addition, the successive times between failures are not necessarily identically distributed. More generally, they can become smaller (an indication of deterioration). However, if any organic deterioration is detected, then the decision of...

We study the problem of proposing Condition-Based Maintenance policies for machines and equipments. Our approach combines an optimization model and input parameters estimation from empirical data. The system deterioration is described by discrete states ordered from the state “as good as new” to the state “completely failed”. At each periodic inspection, whose outcome might not be accurate, a d...

This paper deals with the two-warehouse partial backlogging inventory problems under inflation for a deteriorating product with a constant demand rate over an infinite horizon. In contrast to the traditional model in which each replenishment cycle starts with an instant replenishment and ends with shortages, an alternative model is proposed in recent literature in which each cycle starts with s...

In this paper, we study a monotone process maintenance model for a multistate system with k working states and failure states. By making different assumptions, we can apply the model to a multistate deteriorating system as well as to a multistate improving system. We show that the monotone process model for a multistate system is equivalent to a geometric process model for a two-state system. T...

The bullwhip effect phenomena in supply chain management were discussed a lot in the literatures. Most of them provided empirical evidences or analytical formulas to demonstrate the existence of the bullwhip effect in a simple two or more echelons supply chain. This paper will explore the phenomena in a quite different situation: a supply chain with deteriorating products. Unlike the convention...

In this study, we consider a permutation flow shop scheduling problem on a three-machine with deteriorating jobs (a deteriorating job means that the job’s processing time is an increasing function of its starting time) so as to minimize the makespan. We model job deterioration as a function that is proportional to a linear function of time. For some special cases, we prove that the problem can ...

BackgroundQueensland Adult Deterioration Detection System (Q-ADDS) is the acute-care vital sign observation chart used widely throughout Queensland, Australia. The diagnostic accuracy of in detecting patient deterioration unknown.AimThis study aims to assess how accurately Q-ADDS predicts hospitals and contribution each predicting deterioration.MethodsThis multi-centre retrospective case–contro...

This paper studies the single-machine scheduling problem with deteriorating jobs and learning considerations. The objective is to minimize the makespan. We first show that the schedule produced by the largest growth rate rule is unbounded for our model, although it is an optimal solution for the scheduling problem with deteriorating jobs and no learning. We then consider three special cases of ...