Grid Computing & Semantic Web. Grid Computing Proposed with the idea of electric power grid; Aims at integrating large-scale (global scale) computing.

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Presentation transcript:

Grid Computing & Semantic Web

Grid Computing Proposed with the idea of electric power grid; Aims at integrating large-scale (global scale) computing resources; Plug & Play

Grid Computing Then what computing resources? Computer processors or clusters; Networks; Data storage devices; Scientific instruments; Most importantly, they should be reached via Internet.

Why Grid Computing Good things: The increasing availability of computing resources; Yet not fully used; Internet is everywhere.

Why Grid Computing Challenges Too much data; Scalable? Multi-disciplinary collaboration; Security issues.

A Definition “ The Grid is a software infrastructure that enables flexible, secure, coordinated resource sharing among dynamic collection of individuals, institutions and resources” (Foster, Kesselman and Tuecke 2001)

The Development From mid 1990s; Maturing in the 2000s; The tools, projects, and discussions.

Major Challenges Design widely accepted protocols for Job status monitoring and execution management; Data management; Resource coordination and discovery; Security (authentication and authorization). Define application programming interfaces (APIs) and Software Development Kits (SDKs)

Grid Application Examples cts.phphttp:// cts.php Faster, more secure and more flexible; Facilitate collaboration,

GIS Grids Grid for GIS applications; A few related projects (GEON, GISolve, LEAD); （

Semantic Web Proposed to facilitate web-based information sharing; Aims at automated machine-based information processing;

Why Semantic Web Current web HTML dominates the web; Designed for human to digest; No semantics embedded;

Why Semantics Matter Semantics: the meaning of data? Semantic heterogeneity (e.g. naming); Need formal description?

Again, Why Semantic Web New generation of WWW; New representation of www data; As a global-scale intelligent database; How? (Enhance HTML by adding semantics)

How to Build A Semantic Web Use URI (Uniform Resource Identifier); Similar to URL; Also with RDF (Resource Description Framework): Three URIs.

An RDF Example The triples: Creator, title, name; Formatted so can be processed easily. Source:

More… Can use RDF schema to model data; May need to conduct reasoning tasks; Web Ontology Language (OWL).

GIS Semantic Web GIS has similar semantic problems; The problem of interoperability; Geospatial ontologies.

The End Thanks!