Information Technology Reference
In-Depth Information
Chapter 19
An Ontology-Based P2P
Network for Semantic Search
Tao Gu
University of Southern Denmark, Denmark
Daqing Zhang
Institut Telecom SudParis, France
Hung Keng Pung
National University of Singapore, Singapore
ABSTRACT
This article presents an ontology-based peer-to-peer network that facilitates efficient search for data in
wide-area networks. Data with the same semantics are grouped together into one-dimensional semantic
ring space in the upper-tier network. This is achieved by applying an ontology-based semantic clustering
technique and dedicating part of node identifiers to correspond to their data semantics. In the lower-tier
network, peers in each semantic cluster are organized as Chord identifier space. Thus, all the nodes in
the same semantic cluster know which node is responsible for storing context data triples they are look-
ing for, and context queries can be efficiently routed to those nodes. Through the simulation studies, the
authors demonstrate the effectiveness of our proposed scheme.
INTRODUCTION
(Dey et al., 2000). With the vast amount of context
information spread over multiple context spaces
and the increasing needs of cross-domain context-
aware applications, how to provide an efficient
context search mechanism is challenging in the
context-aware research community.
One approach is to use a centralized search
engine to store context data and resolve search
requests. Although this approach can provide fast
responses to a context query, it has limitations
such as scalability, a single processing bottle-
In recent years, the use of context information has
attracted a lot of attention from researchers and
industry participates in ubiquitous and pervasive
computing. Users and applications are often inter-
ested in searching and utilizing widespread context
information. Context information is characterized
as an application's environments or situations
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