Several Peer to Peer (P2P) streaming systems have proved by now their ability to deliver live video streams to hundreds of users. However the inherent instability of the distribution environment poses several obstacles for these systems to manage to deliver a high quality experience to the end users. In this paper we explore node churn which independently of the distribution topology adopted, i...

A wireless sensor network is a collection of nodes organized in to a cooperative network. Each node consists of processing capability, multiple types of memory, a power source and actuators and sensors. This wireless sensor network is established in hostile and harsh environments like civil and military applications. This network is prone to various attacks. One of the major attack is clone att...

IEEE 802.11 exhibits both short-term and long-term unfairness [15]. The short-term fairness automatically gives rise to long-term fairness, but not vice versa [11]. When we thoroughly investigated a simple scenario with hidden terminals, we found it to be unfair on the short-term basis, though it provides fair access on a long-term basis. It implies that the protocol cannot be used to provide f...

A key measure that has been used extensively in analyzing complex networks is the degree of a node (the number of the node’s neighbors). Because of its discrete nature, when the degree measure was used in analyzing weighted networks, weights were either ignored or thresholded in order to retain or disregard an edge. Therefore, despite its popularity, the degree measure fails to capture the disp...

In this paper, a cooperative algorithm to improve the orthogonal space-timefrequency block codes (OSTFBC) in frequency selective channels for 2*1, 2*2, 4*1, 4*2 MIMO-OFDM systems, is presented. The algorithm of three node, a source node, a relay node and a destination node is formed, and is implemented in two stages. During the first stage, the destination and the relay antennas receive the sym...

It is very difficult and expensive to replace sensor node battery in wireless sensor network in many critical conditions such as bridge supervising, resource exploration in hostile locations, and wildlife safety, etc. The natural choice in such situations is to maximize network lifetime. One such approach is to divide the sensing area of wireless sensor network into clusters to achieve high ene...

The capture efficiency of the small aerosol particle is strongly influenced by the structure of fibrous layers. This study presents particle deposition and dendrite formation on different arrangements of binary fibers. 2-D numerical simulation is performed using the open source software of OpenFOAM. In the instantaneous filtration of a single fiber, obtained results are in good agreement with th...

background hepatitis b virus (hbv) covalently closed circular dna (cccdna) served as a vital role in the life cycle of the virus and persistent infection. however, specific and quantitative methods for cccdna detection have not been available. objectives our aim was to develop and primarily evaluate a quantitative method for hbv cccdna based on magnetic capture hybridization and quantitative pc...

Graph anomaly detection (GAD) is a vital task in graph-based machine learning and has been widely applied many real-world applications. The primary goal of GAD to capture anomalous nodes from graph datasets, which evidently deviate the majority nodes. Recent methods have paid attention various scales contrastive strategies for GAD, i.e., node-subgraph node-node contrasts. However, they neglect ...

Multi-node wind speed forecasting is greatly important for offshore power. It a challenging task due to unknown complex spatial dependencies. Recently, graph neural networks (GNN) have been applied because of their capability in modeling However, existing methods usually require pre-defined structure, which not optimal the downstream and limits application scope GNN. In this paper, we propose a...