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The SIDAM Project
We are currently engaged in a research project called SIDAM [4].
SIDAM stands for Distributed Information Systems for Mobile Agents. The research aims
at studying the main problems related to the design and implementation of decentralized
information systems for mobile users. As a reference application it uses an
on-line system for disseminating road traffic information, but the model is
generic enough to be applied to a wide spectrum of applications.
The SIDAM reference application is a distributed information service
disseminating road traffic information for a large metropolis, such
as São Paulo, Tokyo, or New York.
The service can be queried and updated by mobile users, who
may be either common citizens requiring information about the
traffic situation in a specific part of a city or may be the
São Paulo Traffic Engineering Company (CET) staff, feeding the
system with data about the traffic.
In order to keep the size of the
information base and the corresponding queries manageable, the SIDAM
application divides the city into micro-regions (e.g., a few blocks)
that are the atomic units holding traffic information. The
micro-regions traffic data are stored at Information Servers
(IS). Each information server can hold data from one or more
micro-regions. Information servers reside at Data Servers,
which are fixed hosts.
The SIDAM reference architecture is a interesting example of a highly dynamic and
distributed application since the generation, storage and query of
information are decentralized and clients are mobile.
In this case, adaptation becomes essential for achieving high
service availability, dynamic load balancing and near optimal response
times for clients.
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Francisco Jose da Silva e Silva
2001-09-24