Stacking core layers is emerging as an alternative for future high performance computing, but thermal problems have to be tackled first. When adaptive voltage scaling is adopted to hide the growing variation in the performance of cores, as a result, heat generation of each core varies. By exploiting the static thermal characteristics, the efficiency of dynamic thermal management can be improved...

We propose a watermarking scheme to hide copyright information in an image. The scheme employs visual masking to guarantee that the embedded watermark is invisible and to maximize the robustness of the hidden data. The watermark is constructed for arbitrary image blocks by ltering a pseudo-noise sequence (author id) with a lter that approximates the frequency masking characteristics of the visu...

Most generic performance tools display only system-level performance data using 2-dimensional plots or diagrams and this limits the informational detail that can be displayed. Moreover, a modern relational database system, like Oracle, can concurrently serve thousands of client processes with different workload characteristics, so that generic performance-data displays inevitably hide important...