Accessing Distributed Multimedia Documents for Instructional Use.

Autor/inn/en	Bourdeau, J.; und weitere
Titel	Accessing Distributed Multimedia Documents for Instructional Use.
Quelle	(1994), (7 Seiten) PDF als Volltext kostenfreie Datei Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Monographie
Schlagwörter	Access to Information; Computer Networks; Database Management Systems; Distance Education; Foreign Countries; Higher Education; Integrated Learning Systems; Multimedia Materials; Quality Control + Suchen Sie Ihr Suchwort? Computernetz; Computernetze; Kommunikationsnetz; Datenbanksystem; Distance study; Distance learning; Fernunterricht; Ausland; Hochschulbildung; Hochschulsystem; Hochschulwesen; Qualitätskontrolle
Abstract	Students, teachers, and authors need to access multimedia documents over heterogeneous networks. The efficient handling of time-dependent multimedia information such as audio and video in distributed systems requires considerable network and computing resources. The term Quality of Service (QoS) refers collectively to the specifications of these resources for a given type of service, and to the mechanisms through which these resources can be allocated. QoS is a major consideration for instructional use. A Distributed Multimedia Database (DMD) (a distributed multimedia file system augmented by some search capabilities) was developed to answer these needs. Two sites at the University of Montreal and Teleuniversity (Quebec, Canada) campuses were interconnected, each site having a number of workstations. The network configuration consists of a low-speed line between the two campuses (modems at 14.4Kbaud/sec, yielding speeds up to 32Kbits/sec), connection two LANS (local area networks) (ethernet), one on each campus. DMD is built upon two components: Apple Remote Access (ARA), and the Alias mechanism of OS 7.1. The file system is implemented on Macintoshes in HyperCard, and the user interface consists of the following: a global catalog named GC, showing the list of all files available in the DMD; file display showing retrieved files; and audio and video control panel. The DMD has been connected to an integrated learning environment, HYPERGUIDE, which provides distance education students with the structure and objectives of a course, course contents, document base, and guidance throughout the learning activities. A scenario has been designed for computer supported collaborative learning activities using the DMD. The Distributed Jigsaw scenario was implemented and tested. Accessing multimedia documents over heterogeneous networks can benefit students and authors. Facilities for QoS negotiation is critical for instructional use. (MAS)
Erfasst von	ERIC (Education Resources Information Center), Washington, DC