Search results for "internet"

Multicast access control concept for xDSL-customers

2006

Multicast is a tempting possibility for many broad- band services. It makes possible to deliver one data-stream to several receivers simultaneously. IP-Multicast is based on an open group concept. This means that it is possible for all the users to join the group and thus receive the data. The open concept is also the main reason why multicast has not been taken in wider use. There is two different solution to solve this problem, group access control and multicast data encryption. Group access control mechanisms focuses on restricting the group membership at the users edge device. Traffic encryption scheme relies on end-to-end encryption, so a key management architecture is also needed. We …

Quality of Service Multicasting over Differentiated Services Networks

2003

This paper proposes a solution to support real-time multicast traffic with Quality of Service (QoS) constraints over Differentiated Services (DiffServ) IP networks. Our solution allows multicast users to dynamically join and leave the multicast tree. Moreover, it allows a multicast user which has negotiated a best-effort session to upgrade to a QoS-enabled session. Our solution is backward compatible with the Protocol Independent Multicast (PIM) scheme. It combines two ideas. First, resource availability along a new QoS path is verified via a probe-based approach. Second, QoS is maintained by marking replicated packets with a special DSCP value, before forwarding them on the QoS path.

Multicast polling and efficient voip connections in ieee 802.16 networks

2007

IEEE 802.16 standard defines the wireless broadband access network technology called WiMAX which introduces several interesting advantages including its the support for quality of service (QoS) at the MAC layer. Its several features, such as multicast polling support the base station (BS) to provide the QoS guarantees for subscriber stations (SSs). The specification, however, does not define very exactly how this optional multicast polling technique should be used. We propose a way to use this feature on the base stations and also suggest an addition to the specification, to serve several different delay requirements. To test the proposed solution and the performance of the multicast pollin…

2018

Smartphones and other mobile devices have fundamentally changed patterns of Internet use in everyday life by making online access constantly available. The present paper offers a theoretical explication and empirical assessment of the concept of online vigilance, referring to users' permanent cognitive orientation towards online content and communication as well as their disposition to exploit these options constantly. Based on four studies, a validated and reliable self-report measure of online vigilance was developed. In combination, the results suggest that the Online Vigilance Scale (OVS) shows a stable factor structure in various contexts and user populations and provides future work i…

<title>Structure analysis of the Polish academic information society using MDS method</title>

2006

The article presents the methodology of webometrics research and analysis aiming at determining similar features of objects belonging to the Polish information society, which uses the Internet and its www resources for communication purposes. In particular, the analysis applies to the selected Polish technical universities. The research was carried out in several phases - on different data groups - with regards to the Internet space and time changes. The results have been presented in a form of two and three-dimensional topography maps. For the purposes of this analysis, the computer methods of multidimensional scaling were used. The research will be further continued for a selected group o…

Multimedia application to support distance learning and other social interactions in real-time

2000

Supporting social interactions, in distance learning situations for example, with modern technology is very difficult. Generally Internet, networked PC, document handling and communication services and applications are not designed from a multiple user perspective but to support a one-person-one-device (or tool) interaction. This approach creates problems for supporting awareness of, and communication with other people while simultaneously working on documents. Such simultaneous activities have been identified as essential by CSCW and CHI studies, where users are reported to move promiscuously between media and devices, and combine applications and media intuitively, while maintaining aware…

News Consumption in the Mobile Era

2014

Mobile devices allow users to keep ubiquitously connected to the internet. Consequently, they change the reception of information by faster access, greater timeliness, and new media usage contexts. At the same time, many traditional media organizations already produce content for mobile websites and apps in line with cross-media strategies. Reflecting severe structural changes in the journalism market, they are hoping to manage the digital transition successfully by mobile publishing, (re)gaining especially the digital natives. Referring to the media repertoire approach, we examine the role of mobile devices on two different levels. First, from a technical point of view, we consider the pla…

Multimedia and Internet Systems : Theory and Practice

2013

Aleksander Zgrzywa, Kazimierz Choro, and Andrzej Siemiski (Eds.) Multimedia and Internet Systems: Theory and Practice During the last 20 years we have witnessed a rapid development of Multimedia and Network Information Systems. What is even more important, the pace of change does not show any sign of slowing. When we look back we see how many research projects that have originated at various universities or in research facilities are now part of our everyday life. This monograph offers the reader a very broad review of the most recent scientific investigations in that area. The book is a collection of carefully selected and the most representative investigations, solutions, and applications…

Free networks visible networks

2005

Free network visible network is an active media system that uses the possibilities of the new technologies to create new landscapes in the public space by means of the visualization of the data that flow between digital networks. It changes our perception of the world with the "invisible meanings" that are around us. Mixed reality technology and Internet traffic listening system are adopted in this project in order to visualize, floating in the space, the interchanged information between users of a network. The people are able to experience in a new exciting way about how colorful virtual objects, representing the digital data, are flying around. These virtual objects change their shape, si…

Developing a web-based system to create, deliver and assess language proficiency within the PAULEX Universitas Project

2011

This study aims to examine the feasibility of a number of technical solutions implemented in a web-based system designed for the creation and management of online language exams within PAULEX Universitas, a project for the development of an online platform to design, deliver and assess the foreign language exam within the Spanish national University Entrance Examination. The paper provides an overview of the context and a discussion of current changes in Spanish ministerial policies, followed by a description of the PAULEX testing platform and a discussion on the technological solutions adopted. Lastly, the paper reflects upon a quantitative analysis derived from a pilot experience conducte…