Tom McNamara

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This paper studies the operating behaviour of non-automated production lines that are either individually or jointly imbalanced in terms of their operation time means, coefficients of variation and / or buffer sizes. The lines were simulated under their non-steady state mode of operation with various values of line length, buffer storage size, degree of(More)
We analyze the co-normally induced quasiregular representation for two families of Lie groups: the 2d-oscillator groups N!SO(2d) where N is the free two-step nilpotent group on 2d generators, and the dilated 2d-oscillator groups N ! (SO(2d)× R+). We construct irreducible decompositions in both cases with explicit spectrum and intertwining operators, and in(More)
This research assesses the performance of unreliable serial production lines having three simultaneous types of imbalance in terms of their mean operation times, coefficients of variation and buffer sizes. The lines were simulated with various line lengths, total buffer capacities, degrees of imbalance, and patterns of imbalance. Throughput, idle time and(More)
In this paper we study the operating behaviour and performance of reliable, unpaced and unbalanced serial production lines with either imbalanced service time means, unequal coefficients of variation, or uneven buffer capacities. The lines were simulated with various values of line length, buffer storage size, degree of imbalance, coefficient of variation,(More)
This article studies the performance of unpaced serial production lines that are subject to breakdown and are imbalanced in terms of both of their processing time means (MTs) and buffer storage capacities (BCs). Simulation results show that the best pattern in terms of throughput is a balanced line With respect to average buffer level; the best(More)
This paper investigates the benefits of deliberately unbalancing both operation time means (MTs) and unreliability (failure and repair rates) for non-automated production lines. The lines were simulated with various line lengths, buffer capacities, degrees of imbalance and patterns of MT and unreliability imbalance. Data on two performance measures, namely(More)
This article studies the performance of unpaced serial production lines that are subject to breakdown and are imbalanced in terms of both of their processing time means (MTs) and buffer storage capacities (BCs). Simulation results show that the best pattern in terms of throughput is a balanced line With respect to average buffer level; the best(More)