8228 search results - page 322 / 1646 » Structural Logical Relations |
179
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CCS
2007
ACM
16 years 27 days ago
2007
ACM
In this paper, we study the maintenance of role-based access control (RBAC) models in database environments using transitive closure relations. In particular, the algorithms that ...
177
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CIKM
2007
Springer
16 years 27 days ago
2007
Springer
The rapid growth of available data arises the need for more sophisticated techniques for semantic access to information. It has been proved that using conceptual model or ontology...
153
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VLDB
1990
ACM
15 years 10 months ago
1990
ACM
Even though the large body of knowledge of relational query optimization techniques can be utilized as a starting point for object-oriented query optimization the full exploitatio...
199
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GEOINFO
2003
15 years 8 months ago
2003
One of the main challenges for the development of spatial information theory is the formalization of the concepts of space and spatial relations. Currently, most spatial data struc...
163
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APAL
2010
15 years 6 months ago
2010
The study of Borel equivalence relations under Borel reducibility has developed into an important area of descriptive set theory. The dichotomies of Silver ([19]) and Harrington-K...