RRAM (Redundant Random Access Memory) is a RAM with redundant spares included in the chip. Because of the row/column organization of memory cells in RAMs, these spares are organized as rows and columns. Memory cells which are faulty can be repaired by the spare rows, spare columns and their combinations. Because additional cost of incorporating spares and repairing, it is usually advantageous t...

Internal spare parts management is a universal issue faced by all manufacturers, and involves decision-making and planning across a highly complex and heterogeneous group of thousands of items. Spare parts exhibit intermittent demand and a variety of prices, lead times, and potential downtime costs that pose challenges for planning and control. Managers can facilitate spare parts decision-makin...

The telecommunication industry depends on unit level mobility to respond to unexpected demands occurring over a large geographical range. If the response is not timely and comprehensive, these units may fail to meet the customer' required. Therefore, many telecom enterprises prepared abundant spare part. The arrangement provides "timely and wonderful" service while they raise the debt-to-asset ...

In this study we use a flexible policy of spare part management in the context of airports corrective maintenance activities and provide a new approach for mathematically evaluate the performances of systems with lateral transshipments in case of one-for-one ordering policies, transfer times and peaked demand. This study deals with the spare optimization of a large logistics company, in charge ...

This study evaluates the individual, as well as relative and joint value of indices obtained from magnetic resonance imaging (MRI) patterns of brain atrophy (quantified by the SPARE-AD index), cerebrospinal fluid (CSF) biomarkers, APOE genotype, and cognitive performance (ADAS-Cog) in progression from mild cognitive impairment (MCI) to Alzheimer's disease (AD) within a variable follow-up period...

Time pressure is a familiar phenomenon. The quantity of spare time people have clearly effects their satisfaction with their leisure and with their life as a whole. But so too, we show, does how much control people have over how much spare time they have. We measure this through an indicator of ‘discretionary time’, which proves to be equally or more important than spare time itself in these co...

In the book “Optimal inventory modeling of systems: multi-echelon techniques” the author Craig Sherbrooke, who has developed several important model in this area, describes a part of the model cosidered in this manuscript as follows (in “aircraft language”): “When a malfunction is diagnosed on an aircraft, the malfuncioning item is removed from the aircraft and brought into base supply. If a sp...

We analyze the integrated tactical capacity planning of spare parts supply and workforce allocation in maintenance logistics of advanced equipment. The equipment time-to-failure, spare parts replenishment time, and equipment repair time are random and independent of each other.