Ad hoc networks are a new wireless networking paradigm for mobile hosts. Unlike traditional mobile wireless networks, ad hoc networks do not rely on any fixed infrastructure. In this network, this topologies, allowing people and devices to seamlessly internetwork in areas with no pre-existing communication infrastructure, e.g., disaster recovery environments. Each node acting as both a host and...

background :addiction is a global problem for which effective treatment is crucial. stopping the consumption of abused substances in a camp is a strong predictor of the success for the recovery process. the present study employed a qualitative approach to explore the camp recovery experiences in individuals with substance addictions.   methods : the research conducted in iran’s northern cities ...

Local loss recovery for reliable multicast can provide significant performance improvement in terms of loss recovery latency, bandwidth consumption and network throughput. Active Reliable Multicast (ARM) is a novel loss recovery scheme for largescale reliable multicast. In ARM, local loss recovery is realized by retrieving repairs at near active routers. In practice, active resources are limite...

Power assignment schemes are man-made methods to enhance the capture e!ect of radio communications. In a previous study, Wen and Yang investigated the combined capture e!ect of the "xed power assignment scheme, Rayleigh fading, and near}far e!ect on the performance of packet radios. The performance analysis was limited to an in"nite population environment. This assumption is reasonable for a co...

Recent progress in bistatic radar techniques can be used to improve performances of classical monostatic radar. A prominent limitation of coherent radar is its inability to measure the complete velocity vector (magnitude and direction) of a detected target. A single coherent detection can provide range-rate only. At least two detections, separated in time, are needed to estimate the target’s ve...

A carrier synchronization algorithm for high-order QAM modulated signals that uses Kalman filtering techniques shows fast acquisition times and good frequency tracking performances. The algorithm relies on a decision directed extended Kalman filter combined with a lock detector which determines the status of the synchronization process, modifying consequently the filter parameters. Simulations ...

A new cooperative MAC protocol called the busy tone cooperative medium access control (BT-COMAC) protocol is proposed to overcome the drawbacks and maximize the advantages of existing schemes. This scheme uses a new metric called decibel power to decide an appropriate helper node. Using received power strength is more efficient in selecting an appropriate helper node, especially in a densely po...

A Wireless Sensor Network (WSN) is formed by a large quantity of small devices with certain computing power, wireless communication and sensing capabilities. These types of networks have become popular as they have been developed for applications which can carry out a vast quantity of tasks, including home and building monitoring, object tracking, precision agriculture, military applications, d...