This paper describes and evaluates an intelligent wheelchair, adapted for severely disabled persons with mobility impairement. The wheelchair concept is an assistive device that allows the user to select arbitrary local destinations through a tactile screen interface. The device incorporates an automatic navigation system based on a vision system and knowledge base that drives the wheelchair, a...

Dynamic Channel allocation in Cellular Netwosk have become vesy popular off late due to the,flexibility obtained bv using a y of the available channels in any cell as long as the Interfirence level is below a given thseshold. Distsibiited Resousce Allocation is popular in tnodesn day cellular system dire to the incsease in micso-cells and picocells. In our. problem we study Cellulas network und...

realistic mobility models can demonstrate more precise evaluation results because their parameters are closer to the reality. in this paper a realistic fuzzy mobility model has been proposed. this model has rules which are changeable depending on nodes and environmental conditions. it seems that this model is more complete than other mobility models.after simulation, it was found out that not o...

The most attractive feature of WiMAX is arguable the mobility capability that IEEE 802.16e (IEEE, 2004) standard adds to the previous standard. With mobility support, handover has become one of the most important factors that impact the performance of IEEE 802.16e system. Handover is the process of maintaining active sessions of a mobile station when it migrates from current base station to tar...

In cellular networks, blocking occurs when a base station has no free channel to allocate to a mobile user. One distinguishes between two kinds of blocking, the rst is called new call blocking and refers to blocking of new calls, the second is called handoo blocking and refers to blocking of ongoing calls due to the mobility of the users. In this paper, we rst provide explicit analytic expressi...

This paper deals with cellular (e.g. LTE) networks that selectively offload the mobile data traffic onto WiFi (IEEE 802.11) networks to improve network performance. Several architectures that are proposed based on the IETF Proxy Mobile IPv6 (PMIPv6) framework to support seamless data offloading lacks flow-level mobility support and have a single point of failure. Recently, IETF has proposed ext...

The concept of Paging has been found useful in existing cellular networks for mobile users with low call-tomobility ratio (CMR). It is necessary for fast mobility users to minimize the signaling burden on the network. Reduced signaling, also, conserves scarce wireless resources and provides power savings at user terminals. However, Mobile IP (MIP), a base protocol for IP mobility, does not supp...

BACKGROUND In patients with hypertrophic cardiomyopathy and left ventricular outflow tract (LVOT) obstruction, but without basal septal hypertrophy, we sought to identify mitral valve (MV) and papillary muscle (PM) abnormalities that predisposed to LVOT obstruction, using echo and cardiac magnetic resonance. METHODS AND RESULTS We studied 121 patients with hypertrophic cardiomyopathy hypertro...