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Prefetching and Web caching have been known as techniques to increase the speed of Web loading process. Previous studies have been conducted to infuse artificial intelligence such as Artificial Neural Network (ANN) into Web caching. In this paper, we propose a new hybrid technique based on combination of ANN and Particle Swarm Optimization (PSO) for classification Web object either to cache or not...
BitTorrent has emerged as an effective peer-to-peer application for digital content distribution in the Internet. However, selecting peers in BitTorrent for efficient content distribution still poses a number of challenges due to high heterogeneities of peers with varied rates of uploading bandwidth and dynamic content. This paper presents GA-BT, a genetic algorithm based peer selection optimization...
Fast recovery from failures and efficient allocation of link capacities in a network for guaranteeing seamless communication services are two primary goals of network survivability design. Shared backup path protection (SBPP) technique has been shown to be a promising solution to tackle these problems, due to sharing capacity among protection paths. The level of capacity sharing that can be achieved...
The conviction of ??the golden first hour?? and ??the platinum ten minutes?? has been the model professional standard of emergency medical assistance. However, in many countries, the medical services are not up to the standard. A telemedicine system, based on WiMAX wireless technology, is proposed for emergency medical assistance and to implement in the ambulance. The system is specially designed...
UWB (Ultra Wide Band) technology is a reliable transmission scheme for wireless communication with high data rates. It is called as impulse radio, impulse radar or carrier free ultra high resolution scheme. UWB is defined as signals with fractional band width more than 20% of its central frequency or as signals with bandwidth more than 500 MHZ. UWB can be characterized with ultra-short duration pulses...
In this paper, we consider a simple loading algorithm for Orthogonal Frequency Division Multiplexing systems in WLAN for signal spectrum optimization. The algorithm is based on the margin adaptive loading criterion and its performance over 5GHz indoor wireless channels.
Design of Network on chip architectures for multimedia applications is being widely studied. This involves design decisions at various levels of hierarchy. Topology design is one of the significant factors that affect the net delay and the energy consumption of the system. Most of the applications are characterized by bandwidth requirements and latency constraints. The topology must be built satisfying...
In a large scale networked virtual environment, users may request various multimedia data in streaming. Although adopting a peer-to-peer (P2P) architecture can make the transmission of on-demand streaming more efficient, most existing research assume that the peers have infinite buffer to cache the entire content and supply the data from there. In this paper, we consider the practical case in which...
A vehicle area network (VAN) is a local area network deployed onboard a moving vehicle, e.g., a train, bus, or a private car, to provide high-speed Internet access to the passengers. A VAN may face temporary network disconnection when the vehicle passes through challenging radio environments, e.g., deep tunnels. Such disconnections disrupt the ongoing network services causing passenger dissatisfaction...
The number of wireless Internet service users that use wireless LAN or satellite links has increased. The broadband satellite Internet services have especially attracted attention because of its characteristics such as global coverage and robustness. TCP (transmission control protocol) is used by many typical applications over satellite Internet. However, a typical TCP (such as TCP-NewReno) which...
High concentration of users in a cell of a wireless LAN leads to an unsustainable traffic load at the access point (AP). An unsuitable solution to the problem will cause poor connectivity for users, severe performance degradation, and possible collapse of the wireless LAN. In this paper, we present a scheduler based on queue length at the AP and a congestion control scheme based on the channel utilization...
In this paper, we propose a framework to enhance user perceived quality in a multihomed terminal. Based on the observed media independent handover parameters from all the interfaces, the terminal is made aware of the performance of the different access networks and it can intelligently select the interface to send out the data packets. Several schemes, for the purpose of load balancing, are defined...
This paper presents results of channel sounding experiments conducted in two types of corridors in an academic building - one enclosed from the top with recesses for windows on sides and the other open at the top with regularly spaced concrete columns on both sides. The corridors have also openings on either sides leading to hallways. The measurements were made at 1.80 GHz using a channel probing...
The Hybrid CDN-P2P architecture, or HCDN, which combines the complementary advantages of CDN and P2P networks, has been proposed to reduce the deployment cost and to improve the quality of service in file sharing and video streaming applications. A replica placement algorithm (RPA) decides where to replicate the specific data. Existing RPAs for pure CDN do not work efficiently in the HCDN architecture...
Free-riding phenomenon is overwhelming in nowadays P2P network which causes researchers to investigate and develop many approaches to combat it. However, almost all the studies neglect the role of relative contribution of peers, namely willingness of contribution (WoC) in our paper. The ignorant to the ratio of peer's actually contribution to its physical capability would undoubtedly lead to unfairly...
This paper introduces techniques in scheduling jobs on a master/workers platform where the bandwidth is shared by all workers. The goal is to minimize the total makespan. The jobs are independent and each job requires a fixed amount of bandwidth to download input data before execution. The master can communicate with multiple workers simultaneously, provided that the bandwidth used by the master and...
Jitter is the limiting effect for high speed analog-to-digital converters with high resolution and wide digitization bandwidth, which are required in receivers in order to support high data rates. The rapid development of digital wireless system has led to a need of high resolution and high speed analog to digital converter. The performance of a data converter is dependent upon the accuracy and stability...
With the emergence of new technologies such as Virtual Protocol Interconnect (VPI) for the modern data center, the separation between commodity networking technology and high-performance interconnects is shrinking. With VPI, a single network adapter on a data center server can easily be configured to use one port to interface with Ethernet traffic and another port to interface with high-bandwidth,...
In this paper we discuss about our experiences in improving the performance of two key algorithms: the single-precision matrix-matrix multiplication subprogram (SGEMM of BLAS) and single-precision FFT using CUDA. The former is computation-intensive, while the latter is memory bandwidth or communication-intensive. A peak performance of 393 Gflops is achieved on NVIDIA GeForce GTX280 for the former,...
In Peer-to-peer (P2P) IPTV networks, jitter rate is one of the most important metrics for Quality of Service. In this paper, we develop a new approach to estimate jitter rate during playback. Unlike traditional approaches that focus on the download speed, our method relies on the distribution of peer download latencies. We demonstrated how to apply the proposed methodologies in a real-life environment...
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