CASREACT: more than a million reactions
Journal of Chemical Information & Computer Sciences
Journal of Chemical Information & Computer Sciences
Ordering effects in clustering
ML92 Proceedings of the ninth international workshop on Machine learning
Knowledge Discovery in Databases
Knowledge Discovery in Databases
Dynamic and efficient key management for access hierarchies
Proceedings of the 12th ACM conference on Computer and communications security
Key management for non-tree access hierarchies
Proceedings of the eleventh ACM symposium on Access control models and technologies
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A navigational aid for databases that relies on unsupervised hierarchical classification is presented. The approach to hierarchical classification, based on both functional and topological features, supports the creation of deep hierarchies in which succeeding levels represent increasing degrees of abstraction. This allows the user to quickly evaluate the result of a query and to locate interesting items and classes of items by performing a tree traversal rather than a sequential perusal of a hit list or a series of ad hoc query refinements. In very large databases where classical querying methods are increasingly inadequate such as chemical reaction databases, such a browsing method is required in order to manage the flood of information with which the user is confronted.