The SICMA Teleteaching Trial on ADSL and Intranet networks

Proceedings of the IEEE, 2000

An overview of the Internet protocol (IP)-based multimedia subsystem (IMS) infrastructure that relies on the session initiation protocol (SIP) is presented along with its services, applications, and future potential.

2007

This paper aims to show the benefits and the experiences of ISABEL application ??. The aim of ISABEL is to assess the benefits of New Distributed Multimedia Applications using Integrated Broadband Communications (IBC) to support modern cooperative services. In contrast to single user computer applications, distributed collaborative systems consists of both the interconnection technology and the people who are interconnected. ISABEL application has been developed inside ISABEL (I2001) and IBER (RACE 93117) projects, to demonstrate the real usage of ATM technology in two different fields: 1. The first one is a particular configuration of the ISABEL application specially devoted to offer computer support distance learning facilities. This Tele Education Application is developed in order to allow two types of tele-teaching. One oriented to individual training and the second oriented to support the real time remote distribution of a conference between big auditoriums. 2. The second is devoted to provide an advanced distributed multimedia application in the field of Computer Support Cooperative Work (CSCW). This application allows users to maintain computer support conference in order to exchange information, edit documents or distribute special presentations. This paper is devoted to summarize the application functionality and the main usage experiences in the filed of tele-education.

IEEE Transactions on Consumer Electronics, 1998

tocols, i.e., Transmission Control Protocol (TCP for short, IETF RFC 793[11]) and Internet Protocol (IP for short, IETF RFC 791[10]). TCP arid IP are usually refered together as TCP/II? Despite of the general belief that TCP/IP is not suitable for real-time rriuih~media applications, a$er testing in laboratory environment for about one yeal; we are conjiderit in announcing thut our prototype is both eficient and reliable. This success depends on several important factors. First of all, the system operates on a dedicated network in which there exists no other trafic except a light of background trafic generated by the Ether Switch, the major network component used by our prototype. Second, system overhead due to the VOD server and the network adaptor card is minimized. Third, we maximize disk bandwidth by irnplerrienhIrig a proprietary disk $le system. Our experiment shows that it requires only about 330 KBytes at the client buffer to smooth packet delay jitters. In our experimental envirorimerit, due to resource lirriita~ons, up to 40 clients had been tested successfully. By looking at network bandwidth and CPU utilization, we estimate that a ~ ~ * http://info.internet.isi.edu: 80/in-notes/rfc/filedrfc793 .txt single VOD server should be able to handle rriore than 40 interactive cl ien ts playing MPEG-1 system streams sirriultaneously.

Ninth DELOS Workshop, 1999

The ever increasing need for education combined with the recent advances in communication technologies, have encouraged the introduction of numerous remote learning systems and services. In this paper we describe a distance learning system we ...

2005

Abstract The rapid expansion of DSL technology has finally brought wider availability of large bandwidth connections reaching the homes. This new channel can be used for distance learning. We acquired two years of experience in using this technology to support regular university courses. As a result, we developed our own software for asynchronous delivery of the videos of classroom lectures. In this paper we shortly describe the system and we report our experience. Keywords: Video Streaming, Distance Learning

In this paper we present the case for using specifically configured protocol stacks geared towards human requirements in the delivery of distributed multjmedia. We define &a& of /'c~cep/io/t (QoP) as representing the user side of the more technical and traditional Quality of Service (QoS). QoP is a term \vhich cnco~~~passes not only a user's satisfaction with the quality of multimcdiu presentations, but also his/her ability to analyse, synthcsise and asstmilate the informational content of multimedia displays. The lI~~r~r~rr~~/!)/ Recoqfigurable Protocol Studs (DROPS) architecture supports low cost reconfiguration of tndividual protocol mechanisms in an attempt to best maintain QoP in connections where the provided QoS fluctuates unpredictably, Results show that DROPS can be used to improve on the QoP provided by legacy protocol stacks (TCP/IP, UDPIIP), cspccially in the cast of dynamic and complex sequences.

1997

Abstract In September 1993, the Canadian Institute for Telecommunications Research, in collaboration with the IBM Toronto Laboratory Centre for Advanced Studies, initiated a major project on broadband services. The goal of this major project is to provide the software technologies required for the development of distributed multimedia applications. Of particular interest are ���presentational ���applications where multimedia documents, stored in database servers, are retrieved by remote users over a broadband network.

ACM SIGCSE Bulletin, 1997

The European project ELECTRA is concerned with the introduction of multimedia / telematics support to enhance the accessibility (local, regional and international) of learning material and to promote collaborative work. For the purpose of this paper we concentrate on two workpackages in the Limburg University Centre. The Interactive Multimedia Server workpackage focuses on the design of a generic platform for the integration of different types of information related to the learning process. Special attention is given to management, integration and accessibility of study material in an electronic environment. The other workpackage investigates the use of the interactive multimedia server in Medicine education.

NTQ(New Telecom Quarterly), 1996

Lecture Notes in Computer Science, 2001

Nearly all of the multimedia streaming applications running on the Internet today are basically configured or designed for 2D video broadcast or multicast purposes. With its tremendous flexibility, MPEG-4 interactive clientserver applications are expected to play an important role in online multimedia services in the future. This paper presents the initial design and implementation of a transport infrastructure for an IP based network that will support a clientserver system which enables end users to: 1) author their own MPEG-4 presentations, 2) control the delivery of the presentation, and 3) interact with the system to make changes to the presentation in real time. A specification for the overall system structure is outlined. Some initial thoughts on the server and client system designs, the data transport component, QoS provisioning, and the control plane necessary to support an interactive application are described.