An effective warranty servicing strategy should be made considering both warranty cost and product availability. Based on the two-dimensional free repair warranty, a strategy combining the imperfect preventive maintenance and minimal repair is proposed where the imperfect preventive maintenances are implemented in a special subregion of the warranty and all other failures are repaired minimally...

Sleep plays a vital role in regulating physiological mechanisms in the human body. Nowadays, by the change of lifestyle and as a consequence of longer work hours and increased accessibility to media, sleep disturbance becomes a common problem in modern society. Many studies demonstrated that sleep disturbance triggers a systemic low-grade inflammation by increasing the level of several cytokine...

Sleep plays a vital role in regulating physiological mechanisms in the human body. Nowadays, by the change of lifestyle and as a consequence of longer work hours and increased accessibility to media, sleep disturbance becomes a common problem in modern society. Many studies demonstrated that sleep disturbance triggers a systemic low-grade inflammation by increasing the level of several cytokine...

In a recent editorial in Biostatistics, Peng (2009) introduced a system for making data and computer code from papers in the journal publicly available so that other researchers can reproduce the statistical analyses in the paper. The editors explain in a short accompanying note (Diggle and Zeger, 2009) that ‘we wish to encourage the practice of making research published in the journal reproduc...

This paper investigates the role played by labor market risk in shaping individual social policy preferences and political orientations. Do outsiders in the labor market, which are insecure about their future income, express a higher redistributive demand than their insider counterparts do? Does their marginalization in the labor market translate into political disenchantment? When they take pa...

In general, a newly purchased item or system is warranted for a specific period. When the system fails during the warranty period, it is repaired free of charge. Even if the system is repairable, there exists some warranty services under which the manufacturer replaces the failed system during the warranty period. This study considers a case where a manufacturer offers an additional warranty se...

Warranty service providers usually provide homogeneous warranty to improve consumer satisfaction and market share. Considering the difference of consumers, some scholars have carried out studies on maintenance strategies, pricing, payment method, claim behaviour cost analysis in recent years. However, few focused differentiated coverage that considers usage rate option consumers. On basis previ...

The objective of this study is to develop a warranty servicing strategy, based on imperfect and minimal repairs, that minimises the total warranty servicing cost. For pre-specified degrees of repair, the expected warranty servicing cost is minimised by optimally partitioning a two-dimensional rectangular warranty region into n disjoint subregions. We numerically illustrate the imperfect repair ...