Federated database systems for managing distributed, heterogeneous, and autonomous databases
ACM Computing Surveys (CSUR) - Special issue on heterogeneous databases
Information Resources Management in Heterogeneous, Distributed Environments: A Metadatabase Approach
IEEE Transactions on Software Engineering
Presenting a Pierce Logic Based Inference Engine and Theorem Prover for Conceptual Graphs
ICCS '93 Proceedings on Conceptual Graphs for Knowledge Representation
ICCS '93 Proceedings on Conceptual Graphs for Knowledge Representation
The VIS-5D system for easy interactive visualization
VIS '90 Proceedings of the 1st conference on Visualization '90
A lattice model for data display
VIS '94 Proceedings of the conference on Visualization '94
A Statistical Metadata Model for Simultaneous Manipulation of both Data and Metadata
Journal of Intelligent Information Systems
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Environmental data are increasingly being processed automatically into derived products which are then used for a variety of scientific purposes. Lack of adequate documentation of the quality control and transformation algorithms can seriously diminish product credibility and utility, particularly for studies of global change which require consistent information over many decades. Formal modeling of the concepts, algorithms, and data structures provides an approach for increasing the quality and reducing the burden of structuring and providing appropriate metadata. Pilot studies of seemingly simple examples have revealed significant conceptual issues such as the need for a science-based theory of approximate equivalence among different finite representations of the same physical object, and for a careful division of roles between scientists and software designers when implementing support for physical units as metadata.