| dc.description.abstract | The concept of neighborhood systems originated from studies in topology. In this
study, semantical interpretations of neighborhood systems are given by introducing
certain assumptions on neighborhoods. Based upon the notion of neighborhood systems,
a structure called n-closure is proposed, which is a convenient and powerful
tool to model the nearness among elements in a universe. A binary relation is defined
on the n-closure, based on which it is possible to rank all elements in a universe
according to their nearness to a given element.
The notion of information systems is enriched by adding neighborhood systems
on attribute values. A Pawlak information system, (see document)
In a Pawlak information system, the retrieval method is based upon an exact matching
mechanism by using the equality relation =. In this study, a retrieval model is
proposed in the framework of neighborhood-based information systems. Queries are
relaxed by using the notion of neighborhood systems. The retrieved results are ranked
by adopting the proposed ranking structure. This model provides more useful results
than that of Pawlak information systems. | |
