A Hybrid Approach for Searching in the Semantic Web Guide: Dr. S. N. Sivanandam Dept of Computer science & Engg P.Raja 07MW06 Final Yr ME-Software Engg.

Outline Introduction Proposal Weight Mapping Hybrid Spread Activation Implementation Architecture

INTRODUCTION Limitations of traditional search  Based on keyword processing  Relevancy Semantic Search  The Semantic Search uses well-defined meaning given to information on the Semantic Web to augment traditional Information Retrieval (IR)  Improve Relevancy Tools used for semantic search  XML  RDF  OWL

Introduction(conti…) Example

Proposal

Weight Mapping Numerical values are assigned to each relation in the semantic network. Cluster Measure Result: Hybrid Instances network  Each relation instance has both a semantic label and numerical weigh Hybrid Spread Activation Input: Activation value of initial sets of nodes Initial nodes placed in priority queue. Nodes processed according to highest activation values. Current node propagates activation to neighbors. Neighbors that are activated are added to the priority queue. Processed nodes are placed in results list.

Hybrid Spread Activation(conti…) Process repeated until defined state is reached or there are no more nodes in the priority queue. Result Set: Processed Nodes ordered by their activation values. Constrained Spread Activation: Concept type constraint: This constraint is used when the activation must not propagate through nodes of a given concept type. Distance constraint: The spread of activation should cease when it reaches nodes that are more than a given distance from the initial set of nodes.

Implementation Architecture

Semantic Instance Graph AREA Semantic web PUBLICATION Introduction to web services STUDENT sakthi PROFESSOR sakthi Is related to Relates to Researched by Researches in Is advised by advices writes Is written by PUBLICATION Semantic web concepts Is written by writes PROFESSOR sankar Is written by writes

Hybrid Instance Graph AREA Semantic web PUBLICATION Introduction to web services STUDENT sakthi PROFESSOR sakthi Is related to Relates to Researched by Researches in Is advised by advices writes Is written by PUBLICATION Semantic web concepts Is written by writes PROFESSOR sankar Is written by writes

Modules Traditional search - status Generation of RDF from ontology Weight mapping Spread activation – completed 1 level

extensions Ontology updation Key word ranking using hadoop Proposing new data structures for searching.

Sample screen shots RDF Graph

Traditional Search

References Crestani, F. Application of Spreading Activation Techniques in Information Retrieval. Artificial Intelligence Review,11(6): , Froogle. Yates, B., and Neto, B. Modern Information Retrieval. ACM Press, New York, USA, 1999.