Cooperative handoff in wireless networks

Abstract

Abstract-In 802.11-based wireless networks the stations (STAs) are associated with the available access points (APs) and communicate through them. In traditional handoff schemes the STAs get information about the active APs in their neighborhood by scanning the available channels and listen to transmitted beacons. This paper proposes a 802.11k compliant framework for cooperative handoff where the STAs are informed about the active APs by exchanging information with neighboring STAs. In this way we minimize the delay of the scanning procedure. We evaluate the performance of our mechanisms through simulations and we show that when our cooperative framework is applied the network performance is significantly improved. Consequently, our system is more capable in meeting the needs of QoS-sensitive applications.

Modelling of in vitro chondrocyte detachment

“…An elliptical nucleus of similar volume is used for the Fig. 2B, as it has been observed that cell spreading is accompanied by a flatening of the nucleus geometry (Jean et al, 2005;Caille et al, 2002;McGarry and Prendergast, 2004;Athanasiou, 2007). The nucleus, while filling a large section of the cell height in the 6 h cell, is positioned near the base of the 1 h cell based on the reported observations of Caille et al (2002).…”