Introduction to Semantic Web
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1 ه عا ی Semantic Web Introduction to Semantic Web Morteza Amini Sharif University of Technology Fall 95-96
2 Outline Thinking and Intelligent Applications The World Wide Web History The Problem with the Web Machine-Processable Data Semantic Technology & Semantic Layer Cake 2 Introduction to Semantic Web - Morteza Amini
3 Outline Thinking and Intelligent Applications The World Wide Web History The Problem with the Web Machine-Processable Data Semantic Technology & Semantic Layer Cake 3 Introduction to Semantic Web - Morteza Amini
4 Thinking and Intelligent Applications Thinking is the most important aspect of human existence: Aristotle describes Human as Rational Animals But what is thinking? Thought or thinking generally refers to any mental or intellectual activity. In general, thinking can be a complex process that uses concepts, their interrelationships, and inference or deduction, to produce new knowledge. However, thinking is often used to describe such disparate acts as memory recall, Arithmetic calculations, creating stories, decision making, and so on. 4 Introduction to Semantic Web - Morteza Amini
5 Thinking and Intelligent Applications Intelligence has been defined in many different ways including, but not limited to, abstract thought, understanding, self-awareness, communication, reasoning, learning, having emotional knowledge, planning, and problem solving. The term intelligence can be applied to nonhuman entities as we do in the field of Artificial Intelligence (AI). But frequently we mean something somewhat different than in the case of human intelligence. 5 Introduction to Semantic Web - Morteza Amini
6 Thinking and Intelligent Applications Turing Test: Suppose there is a questioner. A machine with true intelligence will pass the Turing Test by providing responses that are sufficiently human-like that the questioner cannot determine which responder is human and which is not. Increasingly, software applications perform tasks that are sufficiently complex and human-like that the term intelligent may be appropriate. AI can be seen as the science of machines that behave intelligently (or simulate intelligent behavior) The concept of intelligent applications entails the efforts to take advantage of AI technologies to enhance applications and make them act in more intelligent ways. 6 Introduction to Semantic Web - Morteza Amini
7 Outline Thinking and Intelligent Applications The World Wide Web History The Problem with the Webs Machine-Processable Data Semantic Technology & Semantic Layer Cake 7 Introduction to Semantic Web - Morteza Amini
8 The World Wide Web History The history of the Web extends back more than 55 years. Early signs of network architecture in the 1960s by ARPANET project. A network between universities and research laboratories. The ARPANET was a success right from the very beginning. Few years later, the network developed New sites (nodes) New capabilities and features (such as software) New protocols to facilitate and file transfers 8 Introduction to Semantic Web - Morteza Amini
9 The World Wide Web History The mid-1980s marked a boom in the personal computer and superminicomputer industries. Internet used to communicate with each other and with their customers. By 1990, the ARPANET was decommissioned, leaving only the vast network-of-networks called the Internet with over 300,000 hosts. Three events fueled the Internet: the introduction of the World Wide Web, the widespread availability of the graphical browsers, the unleashing of commercialization. 9 Introduction to Semantic Web - Morteza Amini
10 The World Wide Web World Wide Web is a system of interlinked hypertext documents accessed via the Internet. Developed by With a web browser, one can view web pages that may contain text, images, videos, and other multimedia, and navigate between them via hyperlinks. Some Standards and Protocols of WWW: HTTP (how to transfer data) GET /index.html URI (how to identify or address data) HTML (how to mark up data for human reader) <html><head><title> Introduction to Semantic Web - Morteza Amini
11 Outline Thinking and Intelligent Applications The World Wide Web History The Problem with the Web Machine-Processable Data Semantic Technology & Semantic Layer Cake 11 Introduction to Semantic Web - Morteza Amini
12 The Problem with the Web Billions of pages with static/dynamic data representations that are designed for direct human. Problems in: Search and retrieving documents Extracting relevant data from retrieved documents Combining information from different sources to achieve a particular goal 12 Introduction to Semantic Web - Morteza Amini
13 Search and Retrieving Documents How can we find some documents on a subject in this huge volume of nonspecified information? Which book is about security? 13 Introduction to Semantic Web - Morteza Amini
14 Extracting Information What is the price of the book? 14 Introduction to Semantic Web - Morteza Amini
15 Combining Information Where can I find the cheapest copy of Computer Security? 15 Introduction to Semantic Web - Morteza Amini
16 Outline Thinking and Intelligent Applications The World Wide Web History The Problem with the Web Machine-Processable Data Semantic Technology & Semantic Layer Cake 16 Introduction to Semantic Web - Morteza Amini
17 The Solution Instead of or beside publishing static represented data in natural language, publish machine-processable data! Publish information in terms understandable for a machine. Ask questions in terms understandable for a machine And: make sure all machines understand your terms! This is what envisioned as Semantic Web. 17 Introduction to Semantic Web - Morteza Amini
18 Machine-Processable Data (1) Publishing: B related-to A C related-to A D related-to C Querying (give me all things related to A):?x related-to A Answer:?x = B?x = C 18 Introduction to Semantic Web - Morteza Amini
19 Machine-Processable Data (2) Publishing (related-to is transitive): B related-to A C related-to A D related-to C?x related-to?y and?y related-to?z?x related-to?z Querying (give me all things related to A):?x related-to A Answer:?x = B?x = C?x = D 19 Introduction to Semantic Web - Morteza Amini
20 Outline Thinking and Intelligent Applications The World Wide Web History The Problem with the Web Machine-Processable Data Semantic Technology & Semantic Layer Cake 20 Introduction to Semantic Web - Morteza Amini
21 Semantic Technology Semantic Technology (by Davis's definition) semantic technology is "a collection of software standards and methodologies that are aimed at providing more explicit meaning for the information in a computational environment". Semantics in semantic technology is interpreted as the mapping between the structured data or concepts and the set of objects. In this way, it provides a common understanding and interpretation about the concepts for machines and humans. Semantic technology encodes meanings (semantics) in an abstract layer by describing the structure of the knowledge we have about them. separately from data and content files, and separately from application code. 21 Introduction to Semantic Web - Morteza Amini
22 Semantic Web Semantic Web= Semantic Technology + Web According to W3C The Semantic Web provides a common framework that allows data to be shared and reused across application, enterprise, and community boundaries By encouraging the inclusion of semantic content in web pages, the Semantic Web aims at converting the current web, dominated by unstructured and semi-structured documents into a "web of data. The term was coined by Tim Berners-Lee for a web of data that can be processed by machines. 22 Introduction to Semantic Web - Morteza Amini
23 Semantic Layer Cake (1) The semantic layer cake provides a framework to present a variety of approaches to provide the meta-data that describe the abstract layer (semantics or meaning of underlying resources and information). More upper layer provides more vocabulary and thus more meaning (semantics). 23 Introduction to Semantic Web - Morteza Amini
24 Semantic Layer Cake (2) We talk more about the different layers of the semantic layer cake, during this course. A semantic data model, which is more often used to represent and share knowledge in a distributed world using semantic technology, is ontology. So, our main focus will be on ontologies. Ontology languages (based on Description Logics) Ontology engineering Ontology alignment and matching 24 Introduction to Semantic Web - Morteza Amini
25 Any Question Introduction to Semantic Web - Morteza Amini
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