Buffer memory allocation is one of the most important, but also one of the most difficult tasks of database system administration. Typically, database management systems use several buffers simultaneously for various reasons, e.g., disk speed, page size, access behavior. As a result, available main memory is partitioned among all buffers within the system to suit the expected workload, which is...

We deal with the problem of scheduling preventive maintenance (PM) for a system so that, over its operating life, we minimize a performance function which reflects repair and replacement costs as well as the costs of the PM itself. It is assumed that a hazard rate model is known which predicts the frequency of system failure as a function of age. It is also assumed that each PM produces a step ...

This paper addresses the gradient estimation of transfer lines comprising two machines separated by a buffer of finite capacity. A continuous flow model is considered, where machines are subject to operation-dependent failures, i.e., a machine cannot fail when it is idle. Both repair times and failure times may be general, i.e., they need not be exponentially distributed. The system is hybrid i...

The allocation of buffers between workstations is a major optimization problem faced by manufacturing systems designers. It entails the determination of optimal buffer allocation plans in production lines with the objective of maximizing their throughput. We present and compare two stochastic approaches for solving the buffer allocation problem in large reliable production lines. The allocation...

In a manufacturing system, lot sizing and maintenance are interdependent interact with each other. Few studies jointly investigated production management considering system degradation. However, during the process, critical component performance will undergo inevitable degradation over time. For example, equipment wears out due to both its own internal causes external environment. To monitor in...

In this study, we propose the maintenance task establishment method based on fault simulation models. Maintenance task allocation model based on Multi-Agent System and High Level Architecture is presented to manage and coordinate the dynamic task allocating process of multi operators and it can make the intelligent decision for their collaborative maintenance operation at each step. Object info...

Electronic version of this technical report is available on the École de technologie supérieure web site The quoting of excerpts or the reproduction of short sections of this report are permitted only if the name of the author and reference to the document are given. Reproduction of all quantitatively or qualitatively important sections of the report requires authorization of the owner of the c...

In real-world environments it is usually difficult to specify the quality of a preventive maintenance (PM) action precisely. This uncertainty makes it problematic to optimise maintenance policy. This problem is tackled in this paper by assuming that the quality of a PM action is a random variable following a probability distribution. Two frequently studied PM models, a failure rate PM model and...