Knowledge Assimilation Agent

The Knowledge Assimilation Agent (KAA) is a knowledge-based component for Grid service workflows, which comprises three basic functionalities:

• assimilates run-time information about Grid services from different sources and produces performance estimations of future Grid service invocations (the KAA-Web Service),
• performs past workflow analysis and produces workflow result estimations (the KAA-WXA tool) and
• discovers new potential services through interactive semi-automatic ontology alignment (the OnTal tool).

Individual tools responsible for each of three functionalities are described in the section Components. Use of KAA functionalities in scope of the K-Wf Grid project is described.

Innovation

KAA (Scientific)

• extends instance based learning (IBL) technique of WS performance prediction by enabling retrieval and inclusion of semantic resource properties into the feature vector,
• enables specification of WS performance prediction profiles which specify feature vector and result to be estimated,
• new ontology for IBL-based WS performance prediction was created together with methodology extending classical Case-Based Reasoning.

KAA (Practical)

• enables to estimate the performance (run-time, availability, accessibility, etc.) of any monitored web service based on the invocation parameters and input resource metadata.