The paper presents an analysis of the effects of lossy compression algorithms applied to images affected by geometrical distortion. It will be shown that the encoding-decoding process results in a nonhomogeneous image degradation in the geometrically corrected image, due to the different amount of information associated to each pixel. A distortion measure named quadtree distortion map (QDM) abl...

percutaneous vertebroplasty is a promising therapeutic technique for pain control in patients with pathologic fractures of vertebral bodies. percutaneous vertebroplasty is an appropriate treatment for vertebral pathologic fractures, which is resistant to other usual treatment. it is a useful and only choice in special cases, because of less tissue damage and there is no risk of open surgery and...

We present a theory of ultrashort-pulse second-harmonic generation (SHG) in materials with longitudinally nonuniform quasi-phase-matching (QPM) gratings. We derive an expression for the output second-harmonic field generated in an arbitrary QPM grating from an arbitrary fundamental field, valid for arbitrary material dispersion in the undepleted-pump approximation. In the case when group-veloci...

The mechanical and deformation mechanism of coral-reef limestone is vital for the stability safety infrastructures built on ground composed those materials. Upon loading, strain softening behavior occurs, usually due to nonuniform cementation distribution, within samples may break up gradually reduce bearing capacity. In order study their features, uniaxial compression tests were carried out in...

In this study, analytical solution is presented to calculate the free vibration frequencies of nonuniform microbeams. Scale effects are modelled using modified couple stress theory and the microbeam is assumed to be thin while Poisson's ratio effects are also taken into account. Nonuniformity is presented by exponentially varying width among the microbeam while the thickness remains constant. R...

We study the concept of bribery in the situation where voters are willing to change their votes as we ask them, but where their prices depend on the nature of the change we request. Our model is an extension of the one of Faliszewski et al. [FHH06], where each voter has a single price for any change we may ask for. We show polynomial-time algorithms for our version of bribery for a broad range ...

In a model of the cerebellar granular layer, pairs of neurons aligned along the parallel "ber axis "red synchronized over long distances provided the a!erent mossy "bers were spatially uniformly excited. Here, we applied a nonuniform mossy "ber input pattern and found that local patches of increased granule cell activity were sharpened by the feedback inhibition which granule cells received fro...

In this correspondence, we discuss periodic nonuniform sampling as described by Yen. Such a sampling scheme is more sensitive to additive white noise than uniform sampling. We give here an explicit formula for the noise amplification of periodic nonuniform sampling compared with uniform sampling.