Difference between Ubiquitous and Pervasive Computing

Ubiquitous means everywhere. Pervasive means "diffused throughout every part of." In computing terms, those seem like somewhat similar concepts. Ubiquitous computing would be everywhere, and pervasive computing would be in all parts of your life.

That might mean the difference between seeing kiosks on every street corner and finding that you could -- or need to -- use your Palm handheld to do absolutely every information-based task.

And, in fact, that's where the difference between these two types of computing lies. Pervasive computing involves devices like handhelds -- small, easy-to-use devices -- through which we'll be able to get information on anything and everything. That's the sort of thing that Web-enabled cell phones promise. Ubiquitous computing, though, eschews our having to use computers at all. Instead, it's computing in the background, with technology embedded in the things we already use. That might be a car navigation system that, by accessing satellite pictures, alerts us to a traffic jam ahead, or an oven that shuts off when our food is cooked.

Source
http://www.computerworld.com/news/2000/story/0,11280,41901,00.html

Ontology - Framework

The essential components of Ontology based service discription

1. Ontology Description Language
2. Ontology Comparision Broker
3. Rule Set Engine

The flow

Describe the service in ontology based language ------> Publish the service ------>
Service Request ------> Ontology Comparision Broker examines the request in its reposiory --->
Checks with the rule set engine for validation ----> responds back to the service request orinator for validaion of the new service ontology (if changed)

Resources
www.topicmaps.org
www.semanticweb.org
www.tm4j.org

Ontology

Ontologies establish a joint terminology between members of a community of interest. These members can be human or automated agents. To represent a conceptualization a representation language is need. Several representation languages and systems are defined