Search results for " internet"

Cooperative Medium Access Control in Wireless Networks: The Two-Hop Case

2009

Cooperative communication has been recently proposed as a powerful means to improve network performance in wireless networks. However, most existing work focuses solely on one-hop source-destination cooperation. In this paper, we propose a novel cooperative MAC mechanism that is specially designed for two-hop cooperation communications where the source node and the destination node cannot hear each other directly. In this case, cooperative communication is operated in a two-hop manner and transmit-diversity is achieved by the reception of the same data packet forwarded through multiple relays towards a single destination. The proposed scheme employs an efficient relay selection algorithm to…

An optimal energy efficient cooperative retransmission MAC scheme in wireless networks

2011

While the benefits of cooperative diversity have been well studied in the literature, cooperative MAC protocol design has also attracted much attention recently. In the single-relay Cooperative Automatic Repeat reQuest (C-ARQ) protocol, the best relay node is selected in a distributed manner by relays using different backoff time before packet retransmission. However, this relay selection scheme does not work efficiently in a dense network scenario, due to possible high collision probability among different contending relays. In this paper, we propose an optimized relay selection scheme to maximize system energy efficiency by reducing collision probability. The energy efficiency performance…

Mobile Electronic Commerce: Emerging Issues

2000

There are many definitions for Mobile Electronic Commerce (M-Commerce). We define M-Commerce as any type of transaction of an economic value having at least at one end a mobile terminal and thus using the mobile telecommunications network. The Wireless Application Protocol (WAP) plays an important role in m-commerce by optimizing Internet standards for the constraints of the wireless environment and thus bridging the gap between Internet and mobile world. Mobile Network Operators can play a major role in m-commerce by being strategically positioned between customers and content/service providers. In this paper we investigate the roles the operator can play in m-commerce and discuss respecti…

A study on the statistical properties of double hoyt fading channels

2009

This paper deals with a study on the statistical properties of narrowband amplify-and-forward relay fading channels for Hoyt multipath propagation environments. We consider the basic radio link topology, where only one fixed relay station is used for the amplification. In this case, the envelope of the signal received over the overall multipath channel is modeled by the so-called double Hoyt fading process. Considering this multipath propagation channel model, analytical expressions for the first and second order statistics are provided. Specifically, the mean value, variance, probability density function (PDF), level-crossing rate (LCR), and average duration of fades (ADF) of double Hoyt p…

Practices and Knowledge: Philosophy of Biomedicine, Governance and Citizen Participation

2018

The present chapter addresses the emergence of new forms of governance and citizen participation in the context of certain biotechnologies. On the basis of three case studies, we have mapped different models of public participation in health issues (especially health activism and Internet users, though not exclusively): identifying and analyzing actors, their mutual relationships (mainly those between "patients"/activists groups and the biomedical community), strategies and forms of participation, the exchange and circulation of "expert/lay" knowledge (and the role of the Internet in these processes), and the different activities and forms of knowledge production by "lay" citizen groups (or…

‘It Goes Around the World’ – Children’s Understandingof the Internet

2019

The Internet has become an important literacy environment, even for children. Therefore, building the foundations for their critical engagement with online information should start when they first enter school. One way to start is to help children build an understanding about the complexities of the Internet environment. The present study aimed at increasing our knowledge about children’s understanding of the Internet as a technical and social environment. It also explored how children perceive the trustworthiness of online information. The participants included 30 children aged 7–9 years. The children were interviewed and the data was analysed using content analysis. We share the results f…

Problematic internet use prior to and during the COVID-19 pandemic

2021

The health and socio-economic challenges arising from the COVID-19 pandemic have led to greater reliance on the internet to meet basic needs and responsibilities. Greater engagement in online activities may have negative mental and physical health consequences for some vulnerable individuals, particularly under mandatory self-isolation or ‘lockdown’ conditions. The present study investigated whether changes in levels of involvement in online activities during the COVID-19 pandemic (i.e., watching TV series,online sexual activities, video games, social networks, gambling, online shopping, and instant messaging) were associated with problematic internet use, as well as whether certain psychol…

2020

Communication within contemporary families is increasingly and to a significantextent mediated through technological devices and digital applications.Although the everyday reality of many multilingual families is permeated by technology, research on their digital and language practices has been scant. This article argues for the need for eclectic approaches that draw upon theories, practices, and findings from research on transnational families and migration, digitally mediated family communication, parental mediation, multilingualism online, and family multilingualism and language transmission. Two empirical case studies are presented on multilingual family constellations in Finland in whi…

Relational content of travel and tourism websites

2006

Developments in information technologies are having a far-reaching impact on the travel and tourism industry. This paper analyses the use of the internet as a relational tool for travel and tourism companies providing air travel and rent-a-car services. The empirical research results show the role the internet plays in increasing sales and how companies use different relational tools to gain consumer trust and commitment.

Blockchain based Inter-domain Latency Aware Routing Proposal in Software Defined Network

2018

Border gateway protocol (BGP) version 4 is routing current Internet for more than 20 years. BGP is the only protocol that has proven its routing capability of such size network with continually growing nature. Although BGP is scalable and network layer reachability information it lacks quality of service metrics like latency. BGP routing decision algorithm uses as-path length between autonomous systems (AS) as main factor for most of its best-path calculations. Because of more affordable peering architectures as-path length is generally decreasing in worldwide internet network resulting in less efficient routes for real-time internet protocol traffic. This study proposes future internet arc…