4397 search results - page 249 / 880 » Relational Algebra Operations |
144
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CCS
2007
ACM
15 years 10 months 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 ...
152
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BMCBI
2010
15 years 4 months ago
2010
Background: An important objective of DNA microarray-based gene expression experimentation is determining interrelationships that exist between differentially expressed genes and ...
131
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BMCBI
2008
15 years 4 months ago
2008
Background: Various measures of semantic similarity of terms in bio-ontologies such as the Gene Ontology (GO) have been used to compare gene products. Such measures of similarity ...
135
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BMCBI
2005
15 years 4 months ago
2005
Background: Currently real time PCR is the most precise method by which to measure gene expression. The method generates a large amount of raw numerical data and processing may no...
136
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VLDB
2011
ACM
14 years 11 months ago
2011
ACM
A large number of web pages contain data structured in the form of “lists”. Many such lists can be further split into multi-column tables, which can then be used in more seman...