AR2T : implementing a truly SRAM-based FPGA on-line concurrent testing

The new partial and dynamic reconfigurable features offered by new generations of SRAM-based FPGAs may be used to improve the dependability of reconfigurable hardware platforms through the implementation of on-line concurrent testing / fault tolerance mechanisms. However, such mechanisms imply the existence of new test strategies that do not interfere with the current system functionality.The AR2T (Active Replication and Release for Testing) technique is a set of procedures that enables the implementation of a truly non-intrusive structural on-line concurrent testing approach, detecting and avoiding permanent faults and correcting errors due to transient faults. Experimental results prove the effectiveness of these solutions. In relation to a previous technique proposed by the authors as part of the DRAFT FPGA concurrent test methodology, AR2T extends the range of circuits that can be replicated, by introducing a small replication aid block

Núcleos de Ensino da Unesp: artigos 2007

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Characterisation of microbial attack on archaeological bone

As part of an EU funded project to investigate the factors influencing bone preservation in the archaeological record, more than 250 bones from 41 archaeological sites in five countries spanning four climatic regions were studied for diagenetic alteration. Sites were selected to cover a range of environmental conditions and archaeological contexts. Microscopic and physical (mercury intrusion porosimetry) analyses of these bones revealed that the majority (68%) had suffered microbial attack. Furthermore, significant differences were found between animal and human bone in both the state of preservation and the type of microbial attack present. These differences in preservation might result from differences in early taphonomy of the bones. © 2003 Elsevier Science Ltd. All rights reserved