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2007
15 years 8 months ago
Extending Role Based Access Control Model for Distributed Multidomain Applications
This paper presents the results related to the development of a flexible domain-based access control infrastructure for distributed Grid-based Collaborative Environments and Comple...
Yuri Demchenko, Leon Gommans, Cees de Laat
SIGMOD
2007
ACM
105views Database» more  SIGMOD 2007»
16 years 6 months ago
Nulls, three-valued logic, and ambiguity in SQL: critiquing date's critique
Date's popular critique of SQL's three-valued logic [4, 3] purports to demonstrate that SQL queries can produce erroneous results when nulls are present in the database....
Claude Rubinson
GLOBECOM
2007
IEEE
16 years 28 days ago
Optimum Power Allocation and Bit Loading for Systems with Suboptimum Receivers
— Waterfilling and mercury/waterfilling power allocation policies maximize the mutual information of independent parallel Gaussian-noise channels under an average power constra...
David Matas, Meritxell Lamarca
PRIMA
2007
Springer
16 years 21 days ago
Contextual Agent Deliberation in Defeasible Logic
Abstract. This article extends Defeasible Logic to deal with the contextual deliberation process of cognitive agents. First, we introduce meta-rules to reason with rules. Meta-rule...
Mehdi Dastani, Guido Governatori, Antonino Rotolo,...
APVIS
2007
15 years 8 months ago
Labeling collinear sites
We consider a map labeling problem, where the sites to be labeled are restricted on a line L. This is quite common e.g. in schematized maps for road or subway networks. Each site ...
Michael A. Bekos, Michael Kaufmann, Antonios Symvo...