Doina Caragea Artificial Intelligence Research Laboratory, Department of Computer Science, Iowa State University, Ames, IA 50011 USA [email protected] Adrian Silvescu Artificial Intelligence Research Laboratory, Department of Computer Science, Iowa State University, Ames, IA 50011 USA [email protected] Vasant Honavar Artificial Intelligence Research Laboratory, Department of Compute...

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We address the problem of answering queries over a distributed information system, storing objects indexed by terms organized in a taxonomy. The taxonomy consists of subsumption relationships between negation-free DNF formulas on terms and negation-free conjunctions of terms. In the first part of the paper, we consider the centralized case, deriving a hypergraph-based algorithm that is efficien...

Inexperienced users typically obtain one of three possible outcomes when they search for online information: they are buried under an information avalanche, they are unable to locate any useful information at all, or they find what they need in roughly the amount they need. Unfortunately, the latter outcome is the most rare. Unfamiliarity with search tactics creates difficulties for many users ...

A new boundary meshfree method, to be called the boundary distributed source (BDS) method, is presented in this paper that is truly meshfree and easy to implement. The method is based on the same concept in the well-known method of fundamental solutions (MFS). However, in the BDS method the source points and collocation points coincide and both are placed on the boundary of the problem domain d...

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OGSA-DAI (Open Grid Services Architecture Data Access and Integration) is a framework for building distributed data access and integration systems. Until recently, it lacked the built-in functionality that would allow easy creation of federations of distributed data sources. The latest release of the OGSA-DAI framework introduced the OGSA-DAI DQP (Distributed Query Processing) resource. The new...

Web communities involve networks of loosely coupled data sources. Members in those communities should be able to pose queries and gather results from all data sources in the network, where available. At the same time, data sources should have limited restrictions on how to organize their data. If a global schema is not available for such a network, query processing is strongly based on the exis...

In this paper we present a federated solution to the problem of resource searching across several organisations. It is a cooperative distributed multiagent system that locates and semantically integrates the access to heterogeneous distributed data sources, using Dublin Core as the metadata model.

The impulse sources are heat impulses or force impulses lengthways the arrangements. They are represented mathematically by Delta functions and Dirac impulses of finite duration. Conventional fitting conditions are compared hereby. The successive time integration of the PDE provides a system of two equations. A Dirac impulse changes into a Ramp function this way and the Delta function becomes t...