The IEEE 802.11e EDCA is the distributed channel access mechanism introduced by the Quality of Service amendment to the IEEE 802.11 standard. This mechanism introduces differentiation to the channel access. This led to the introduction of the principle of the virtual collision. We study, in this paper, the effect of the virtual collision management as presented by EDCA on its fairness among oth...

There is an urgent need to ensure that cancer patients receive high-quality care. This is coupled with the concern that the cost of cancer care is rising faster than many other areas of medicine and the hope that improving quality will both curb these rising costs and improve outcomes (1). The quality of cancer care people receive is highly variable. While some patients often do not receive tre...

One of the most important parameters in evaluating a watermarking algorithm is its capacity. Generally, watermarking capacity is expressed by bits per pixel (bpp) unit measure. But this measure does not show what the side effects would be on image quality, watermark robustness and capacity. In this paper we propose a three dimensional measure named Capacity surface which shows the effects of ca...