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30-10-2009, 04:14 PM
Semantic web.pdf (Size: 49.32 KB / Downloads: 333)
Recently there has been a growing interest in the investigation and development of the next generation web â€œ the Semantic Web. While most of the current forms of web content are designed to be presented to humans, but are barely understandable by computers, the content of the Semantic Web is structured in a semantic way so that it is meaningful to computers as well as to humans. In particular, we present the opportunities that this revolution will bring to us: web-services, agent-based distributed computing, semantics-based web search engines, and semantics-based digital libraries. We also discuss the technical and cultural challenges of realizing the Semantic Web: the development of ontologies, formal semantics of Semantic Web languages, and trust and proof models
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26-03-2011, 09:48 AM
SWS-Lecture3.ppt (Size: 1.45 MB / Downloads: 67)
Semantic Web Services
Where are we?
• Service sector vs Industrial sector vs agriculture sector
– Service sector is becoming more important than industrial sector
– Products today have a higher service component than in previous decades
• The current list of Fortune 500 companies contains more service companies and fewer manufacturers than in previous decades.
The Rise of the Service Economy
• Services have a growing share in any of the big countries
• US or Germany have a long tradition in service economy
• China or India have switched to services more into the last century
• In most countries, services represent more than 50% of the overall economy
• Service economy is growing due to various reasons:
– substituting technology for human labor in many agricultural and manufacturing process
– labor is moved to low cost locations (countries) which makes allows countries that oursource production to focus on services.
Why Service Science?
• Services are becoming more important than any other sector of the economy
• Economies of the world shifting from agriculture and manufacturing to services: The Rise of the Service Economy
• A new discipline dedicated to the study, design, and implementation of service systems is needed - Service Science
• The word service is used in several contexts:
– Communication Service
– Ticket Reservation Service
– Transport Service
– Information Service
– Finance Service
– E-government Service
But what is a Service?
• What is a service?
Main Entry: ser•vice
Etymology: Middle English, from Anglo-French servise, from Latin servitium condition of a slave, body of slaves, from servus slave
1 a: the occupation or function of serving <in active service> b: employment as a servant <entered his service>
2 a: the work performed by one that serves <good service> b: help , use , benefit <glad to be of service> c: contribution to the welfare of others d: disposal for use <I'm entirely at your service>
3 a: a form followed in worship or in a religious ceremony <the burial service> b: a meeting for worship —often used in plural <held evening services>
4: the act of serving: as a: a helpful act <did him a service> b: useful labor that does not produce a tangible commodity —usually used in plural <charge for professional services> c: serve
5: a set of articles for a particular use <a silver tea service>
6 a: an administrative division (as of a government or business) <the consular service> b: one of a nation's military forces (as the army or navy)
7 a: a facility supplying some public demand <telephone service> <bus service> b: a facility providing maintenance and repair <television service>
8: the materials (as spun yarn, small lines, or canvas) used for serving a rope
9: the act of bringing a legal writ, process, or summons to notice as prescribed by law
10: the act of a male animal copulating with a female animal
11: a branch of a hospital medical staff devoted to a particular specialty <obstetrical service>
Joined: Apr 2012
27-09-2012, 05:08 PM
Semantic Web.docx (Size: 15.42 KB / Downloads: 14)
In the beginning, there was no Web. The Web began as a concept of Tim Berners- Lee, who worked for CERN, the European organization for physics research. CERN's technical staff urgently needed to share documents located on their many computers. Berners-Lee had previously built several systems to do that, and with this background he conceived the World Wide Web.
The design had a relatively simple technical basis, which helped the technology take hold and gain critical mass. Berners-Lee wanted anyone to be able to put information on a computer and make that information accessible to anyone else, anywhere. He hoped that eventually, machines would also be able to use information on the Web. Ultimately, he thought, this would allow powerful and effective human-computer- human collaboration.
What is the Semantic Web?
The word semantic implies meaning. For the Semantic Web, semantic indicates that the meaning of data on the Web can be discovered not just by people, but also by computers. The phrase the Semantic Web stands for a vision in which computers software's as well as people can find, read, understand, and use data over the World Wide Web to accomplish useful goals for users.
Of course, we already use software to accomplish things on the Web, but the distinction lies in the words we use. People surf the Web, buy things on web sites, work their way through search pages, read the labels on hyperlinks, and decide which links to follow. It would be much more efficient and less time-consuming if a person could launch a process that would then proceed on its own, perhaps checking with the person from time to time as the work progressed. The business of the Semantic Web is to bring such capabilities into widespread use
THE SEMANTIC WEB FOUNDATION
The Semantic Web was thought up by Tim Berners-Lee, inventor of the WWW, URIs, HTTP, and HTML. There is a dedicated team of people at the World Wide Web consortium (W3C) working to improve, extend and standardize the system, and many languages, publications, tools and so on have already been developed.
The World Wide Web has certain design features that make it different from earlier hyperlink experiments. These features will play an important role in the design of the Semantic Web. The Web is not the whole Internet, and it would be possible to develop many capabilities of the Semantic Web using other means besides the World Wide Web. But because the Web is so widespread, and because it's basic operations are relatively simple, most of the technologies being contemplated for the Semantic Web are based on the current Web, sometimes with extensions.
The Web is designed around resources, standardized addressing of those resources (Uniform Resource Locators and Uniform Resource Indicators), and a small, widely understood set of commands. It is also designed to operate over very large and complex networks in a decentralized way. Let us look at each of these design features.