3 research outputs found
Implementation of a topic map data model for a Web-based information resource
Cataloged from PDF version of article.The Web has become a vast information resource in recent years. Millions of
people use the Web on a regular basis and the number is increasing rapidly. The
Web is the largest center in the world presenting almost all of the social,
economical, educational, etc. activities and anyone from all over the word can
visit this huge place even though he does not have to stand up from his sit. Due to
its hugeness, finding desired data on the Web in a timely and cost effective way is
a problem of wide interest. In the last several years, many search engines have
been created to help Web users find desired information. However, most of these
search engines employ topic-independent search methods that rely heavily on
keyword-based approaches where the users are presented with a lot of
unnecessary search results.
In this thesis, we present a data model using topic maps standards for Webbased
information resources. In this model, topics, topic associations and topic
occurrences (called as topic metalinks and topic sources in this study) are the
fundamental concepts. In fact, the presented model is a metadata model that
describes the content of the Web-based information resource and creates virtual
knowledge maps over the modeled information resource. Thus, semantic indexing
of the Web-based information resource is performed for allowing efficient search
and querying the data on the resource.
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Additionally, we employ full text indexing in the presented model by using a
widely accepted method that is inverted file index. Due to the rapid increase of
data, the dynamic update of the inverted file index during the addition of new
documents is inevitable. We have implemented an efficient dynamic update
scheme in the presented model for the employed inverted file index method.
The presented topic map data model provides combining the powers of both
keyword-based search and topic-centric search methods. We also provide a
prototype search engine verifying that our presented model contributes very much
to the problem of efficient and effective search and querying of the Web-based
information resources.Kutlutürk, MustafaM.S
Geographic Data Handling in a Deductive Object-Oriented Database
. This paper describes how a deductive object-oriented database (DOOD) can be used to support the storage and management of data which is typical of that found in geographic information systems (GIS). This is done with two aims in mind: to illustrate how a combination of deductive and object-oriented facilities can be applied effectively in an advanced application, thereby motivating the development of DOOD systems; and to show how geographic database systems stand to gain from the utilisation of advanced data modelling and inference facilities as supported by a DOOD. The paper describes the DOOD system which has been used for prototyping a range of geographic concepts, presents a framework for the structural organisation of GIS data using an object-oriented data model, and shows how a logic query language can be used within this structural framework to perform a range of analyses. Keywords: Object-Oriented Databases, Deductive Databases, Geographic Information Systems, S..