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...

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We consider preemptive scheduling of N tasks on m processors; processors have different speeds, tasks require amounts of work which are exponentially distributed, with different parameters. The policies of assigning at every moment the task with shortest (longest) expected processing time among those not yet completed to the fastest processor available, second shortest (longest) to the second f...

Error recovery capability is examined in processing arrays that employ spare nodes for fault tolerance. Spares can provide fault tolerance to high-performance single-package arrays, where it is not feasible to repair faulty subsystems. The cost of such a fault-tolerance solution , redundant hardware that idles until needed, may not be practical. Manufacturers must be ooered hardware solutions t...

Spare parts inventories assist maintenance staff to keep equipment in operating condition. Thus the level of spares stocked has a direct bearing on machine availability. This paper presents an innovative risk based approach for spare parts inventory optimisation. Research presented here is in response to a real-life problem of developing a methodology for optimising the stocking of spare parts ...