Nonparametric repair-limit replacement policies with imperfect repair

Article Abstract:

A straightforward algebraic procedure and a geometric one based on the Total Time on Test concept are used to obtain the optimal repair-time limit which reduces the total expected cost per unit time in the steady state. The solution procedures are used for the repair-limit replacement problem of determining the timing to stop repairing a unit after its failure. A nonparametric solution procedure to estimate the optimal repair-time limit is proposed. Simulation results reveal that it provides a good estimate for a sufficiently large number of data set.

Analysis, Maintenance, Repairing

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Optimal location and capacity of emergency cleanup equipment for oil spill response

Article Abstract:

An integrated framework that considers important strategic issues is proposed for planning and decision-making concerning oil spill events. The scheme takes into account the implications of issues even after the oil spill has taken place. Among the important issues it addresses are the optimal location, number and type of cleanup equipment at facility sites and appropriate capacity levels and post oil spill dispatching policies. A linear integer programming model is developed and a relaxation of the original problem is solved.

Management, Strategic planning (Business), Oil spills

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Optimal solutions for the machining economics problem with stochastically distributed tool lives

Article Abstract:

The problem of concurrently determining the optimal cutting speed and tool replacement strategy for minimizing machining cost per part, otherwise known as the single tool machining economics problem with stochastically distributed tool life, was considered. Specifically, several analytical models and efficient solution methods were developed. The latter are based on the separability of the objective function when the tool life follows either a Gamma distribution of fixed order or other phase type distributions.

Operations research, Management science, Case studies

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