Hsu, C.-N., and Knoblock, C. A. 1993. Learning database abstractions for query reformulation. In Knowledge Discovery in Database, Workshop, AAAI93.  Home/Search Document Details and Download
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Discovery and Maintenance of Functional Dependencies by.. - Bell (1995) (11 citations) (Correct)
....SQO automatically with constraints and extends them to constraints which precisely reflects the present content of the database. Siegel has reported this by the first time (Siegel 1988) and (Siegel, Sciore, Salveter 1991) Such constraints have been termed, for example, Database Abstractions in (Hsu Knoblock 1993), Metadata in (Siegel Madnick 1991) and Meta Knowledge in (Schlimmer 1991) Also, Hsu and Knoblock (Hsu Knoblock 1993) have shown the benefits of optimization techniques based on automatically discovered constraints. But we have to keep in mind that these constraints are only valid in the ....
.... Siegel has reported this by the first time (Siegel 1988) and (Siegel, Sciore, Salveter 1991) Such constraints have been termed, for example, Database Abstractions in (Hsu Knoblock 1993) Metadata in (Siegel Madnick 1991) and Meta Knowledge in (Schlimmer 1991) Also, Hsu and Knoblock (Hsu Knoblock 1993) have shown the benefits of optimization techniques based on automatically discovered constraints. But we have to keep in mind that these constraints are only valid in the present state of the database and therefore describe the content of the database precisely. The constraints may become ....
Hsu, C.-N., and Knoblock, C. A. 1993. Learning database abstractions for query reformulation. In Knowledge Discovery in Database, Workshop, AAAI93.
Deciding Distinctness of Query Results by Discovered Constraints - Bell (3 citations) (Correct)
....a new approach to solve both problems: provides SQO automatically with constraints, and extends them to constraints which are not valid in all states of the database, but describe the present state of the database precisely. This has been recognized by Siegel [Siegel, 1988] Also, Hsu and Knoblock [Hsu and Knoblock, 1993] have shown the benefits of optimization techniques based on automatically discovered constraints. The discovery of functional dependencies and keys has been only regarded under the assumption of integrity constraints. This implies a closed world assumption, which is not comparable to our ....
Hsu, C.-N. and Knoblock, C. A. (1993). Learning database abstractions for query reformulation. In Knowledge Discovery in Database, Workshop, AAAI-93.
Cooperating Agents for Information Retrieval - Knoblock, Arens, Hsu (1994) (40 citations) (Correct)
....to search for the least expensive query in the space of semantically equivalent queries. The reformulation from one query to another is done through logical inference using information source abstractions, the abstracted knowledge of the contents of relevant information sources. See [ Hsu and Knoblock, 1993a ] for an explanation of how rules like these are automatically learned. The information source abstractions describe the information in terms of a set of closed formulas of first order logic. These formulas describe an information source in the sense that they are true with regard to all instances ....
....strives for the best performance that can be provided with the resources available. This means that when it is not processing queries, it gathers information to aid in future retrieval requests. The information agents improve performance by learning about the contents of the information sources [ Hsu and Knoblock, 1993a ] The learning is triggered when an agent detects an excessively expensive query. In this way, the agent will incrementally gather a set of rules to reformulate expensive queries. The learning subsystem uses induction on the contents of the information sources to construct a less expensive ....
Hsu, Chun-Nan and Knoblock, Craig A. 1993a. Learning database abstractions for query reformulation. In Proceedings of the AAAI Workshop on Knowledge Discovery in Databases.
Estimating the Robustness of Discovered Knowledge - Hsu, Knoblock (1995) (3 citations) Self-citation (Hsu Knoblock) (Correct)
....seaports with railroad access and 2,000,000 ft 3 of storage space. From the rule given above, we can reformulate the query so that there is no need to check the railroad access of seaports, which may reduce execution time. In our previous work (Hsu and Knoblock, 1993a; Hsu and Knoblock, 1994; Hsu and geoloc( Safaqis , 8001, Tunisia, seaport( Marsaxlokk 8003 . geoloc( Valletta , 8002, Malta, seaport( Grand Harbor 8002 . geoloc( Marsaxlokk , 8003, Malta, seaport( Marsa 8005 . geoloc( San Pawl , 8004, Malta, seaport( St Pauls Bay 8004 . geoloc( Marsalforn , ....
Hsu, C.-N. and Knoblock, C. A. (1993a). Learning database abstractions for query reformulation.
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