The latency hiding techniques can significantly improve the performance of the parallel programs in distributed memory systems. This paper presents a communication and computation overlapping model to hide the communication latency in data parallel programs. The communication and computation overlapping model makes use of the loop subpartitioning scheme in which a given loop partition is partit...

ing the behaviours of separate actions into a single composite action allows groups of actions to be coordinated instead of multiple individual actions. Returning to the example in section 4.1, this can be done by time-slicing the plan into subplans with homogenous states. These sub-plans are formalized by conjunctions of a temporal constraint, action states, and action superposition applied to...

ing the behaviours of separate actions into a single composite action allows groups of actions to be coordinated instead of multiple individual actions. Returning to the example in section 4.1, this can be done by time-slicing the plan into subplans with homogenous states. These sub-plans are formalized by conjunctions of a temporal constraint, action states, and action superposition applied to...

SSOR preconditioning of fermion matrix inversions which is parallelized using a locally-lexicographic lattice sub-division has been shown to be very efficient for standard Wilson fermions. We demonstrate here the power of this method for the Sheikholeslami-Wohlert improved fermion action and for a renormalization group improved action incorporating couplings of the lattice fermion fields up to ...

Video adaptation allows for direct manipulation of existing encoded video streams to meet new resource constraints without having to encode the video from scratch. Multi-dimensional scalable coding such as motion-compensated subband coding (MCSBC) offers an effective and flexible representation for video adaptation, which is important in a universal media access scenario. However, currently mos...

An investigation into the combining of image-processing schemes, specifically an image enhancement scheme, with existing compression schemes is discussed. Results are presented on the pyramid coding scheme, the subband coding scheme, and progressive transmission. Encouraging results are demonstrated for the combination of image enhancement and pyramid image coding schemes, especially at low bit...

The temperature of the low-density intergalactic medium is set by the balance between adiabatic cooling resulting from the expansion of the universe, and photo-heating by the UV-background. We have analysed the Lyα forest of eleven high-resolution quasar spectra using wavelets, and find strong evidence of a marked jump in the temperature at the mean density, T0, of 60 ± 14 per cent over the red...

general, any n-sequence determines a multiset of (= n!/k!(n-k)!) k-sequences. "J Suppose, conversely, that we are given a multiset 01 k-sequences. Does that multiset come from some sequence? If so, is the source sequence unique? Such questions are reminiscent of the problem of reconstructing graphs from vertex-deleted sub raphs, which has received a great deal of attention in the last twent yea...

The paper deals with a new technique of fragile image watermarking. Proposed technique exploits inter-subband dependencies in order to minimize the influence of inserted watermark on the host image quality. Using the unique watermark based on the low-frequency subband, proposed scheme is resistant against attacks based on series of images analysis. Tampering detection ability of the proposed te...