The successful application to elliptic curve cryptography of side-channel attacks, in which information about the secret key can be recovered from the observation of side channels like power consumption, timing, or electromagnetic emissions, has motivated the recent development of unified formulæ for elliptic curve point operations. In this paper, we show how an attack introduced by Walter can ...

background: helicobacter pylori (h. pylori), is a common infection in pregnant women accompanied by variations in the levels of the igm, iga and igg antibody isotypes. the variations of anti-h. pylori antibodies during and after pregnancy, and the extent of protection they provide to the mother and the fetus are not completely understood. objectives: to investigate the changes of the anti-h. py...

Background: Clarithromycin resistance in Helicbacter pylori has been found to be associated with point mutations in 23s rRNA gene leads to reduced affinity of the antibiotic to its ribosomal target or changing the site of methylation. The aim of this study was to determine the most important point mutations in 23s rRNA gene in H. pylori that are closely related to clarith-romycin resistance amo...

Background: Helicobacter pylori (H. pylori), is a common infection in pregnant women accompanied by variations in the levels of the IgM, IgA and IgG antibody isotypes. The variations of anti-H. pylori antibodies during and after pregnancy, and the extent of protection they provide to the mother and the fetus are not completely understood. Objectives: To investigate the changes of the anti-H. py...

The recently ratified new video compression standard H.264/MPEG-4 AVC is reviewed. Its basic concepts as well as all important features/algorithms are explained in detail, it is put into the historical context of other video coding standards, and an objective and subjective performance evaluation is given. Compared to previous standards, the coding improvements of H.264 are, in terms of PSNR, a...

H.264/AVC is the current video standardization project of the ITU-T Video Coding Experts Group (VCEG) and the ISO/IEC Moving Picture Experts Group (MPEG). The main goals of this standardization effort are to develop a simple and straightforward video coding design, with enhanced compression performance, and to provide a “network-friendly” video representation which addresses “conversational” (v...