Databases Reference
In-Depth Information
4
Broadcasting and Databases
Katsumi Tanaka
Graduate School of Science & Technology, Kobe University
Kazutoshi Sumiya
Research Center for Urban Safety & Security, Kobe University
Akiyo Nadamoto
Graduate School of Science & Technology, Kobe University
Qiang Ma
Graduate School of Science & Technology, Kobe University
ABSTRACT
Recently, much attention has been focused on digital TV broadcasting and broadcast-
type information delivery systems. Notable features of the broadcast-type information
delivery systems are that the same information is transmitted to anonymous users,
and that users receive those information in a passive manner. The delivered contents
is usually composed of multiple components, whose update timings may vary. This
paper describes our recent research focussing on the above substantial aspects of
broadcasting-type information systems. First, we will describe a version management
mechanism to maintain the
temporal consistency
of delivered data in data broadcasting
systems. Secondly, we will describe a way to view Web contents in a
passive manner
like TV-program contents. Finally, we will show our new information filtering
mechanism for data broadcasting systems considering the
time-series features
of data,
especially, the
freshness
and the
popularity
of data.
1
Introduction
Recently, much attention is focused on data broadcasting systems via the internet
or digital broadcasting because of their potential and convenience. The concept of
these systems is generally based on the
push-type information delivery
technology.
The push-type information delivery does not require that users behave in an active
manner in order to access information resources because the required and/or
updated information is transmitted continuously and automatically. Users select
47
