Semantic Web: Killer App for DL Reasoning?

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● Reasoning with Expressive Description Logics
● Summary 1
● Summary 2
● Introduction to Description Logics
● What Are Description Logics?
● DL Architecture
● Short History of Description Logics
● Latest Developments
● Semantic Web:
Killer App for DL Reasoning?
● History of the Semantic Web
● Where we are Today: the Syntactic Web
● Hard Work using the Syntactic Web…
● Impossible (?) using the Syntactic Web…
● What is the Problem?
● Solution(?): Add “Semantic Markup”
● Structure of an Ontology
● A Semantic Web — First Steps
● Ontology Languages
for the
Semantic Web
● RDF and RDFS
● RDF Syntax: Triples
● RDF Syntax: Graphs
● RDFS
● RDF/RDFS Semantics
● Problems with RDFS
● From RDF to OWL
● OWL Language
● OWL Class Constructors
● RDFS Syntax
● OWL Axioms
● Reasoning with OWL
● OWL and Description Logic
● Philosophical Reasons
● Practical Reasons
● Why Decidable Reasoning?
● Why Sound & Complete Reasoning?
● Basic Inference Tasks
● E.g.: Reasoning Support for Ontology Design
● E.g.: Reasoning Support for Instance Retrieval
● DL Reasoning: Highly Optimised Implementations
● Research Challenges
● Summary 1
● Summary 2
● Acknowledgements
● Resources
● Select Bibliography

نوع زبان: انگلیسی حجم: 2.56 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 48 صفحه
سطح مطلب: نامشخص پسوند فایل: ppt
گروه موضوعی: زمان استخراج مطلب: 2019/06/07 09:24:06

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web, semantic, ontology, reasoning, rdf, logic, …, dl, description, base, system, accessible,

توجه: این مطلب در تاریخ 2019/06/07 09:24:06 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

http://www.cs.man.ac.uk/~horrocks/Slides/ICIIP/iciip.ppt

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: web, semantic, ontology, reasoning, rdf, logic, …, dl, description, base, system, accessible,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

reasoning with expressive description logics ian horrocks horrocks@cs.man.ac.uk university of manchester manchester uk logical foundations for the semantic web talk outline introduction to description logics the semantic web killer app for dl reasoning semantic web background ontology languages for the semantic web reasoning with owl oileed demo if time description logic reasoning research challenges summary ۱ dls are family of object oriented kr formalisms related to frames and semantic networks distinguished by formal semantics and inference services semantic web aims to make web resources accessible to automated processes ontologies will play key role by providing vocabulary for semantic markup owl is a dl based ontology language designed for the web exploits existing standards xml rdf s adds kr idioms from object oriented and frame systems w۳c recommendation and already widely adopted in e science dl provides formal foundations and reasoning support summary ۲ reasoning is important because understanding is closely related to reasoning essential for design maintenance and deployment of ontologies reasoning support based on dl systems sound and complete reasoning highly optimised implementations challenges remain reasoning with full owl language convincing demonstration s of scalability new reasoning tasks development of more high quality tools and infrastructure introduction to description logics what are description logics a family of logic based knowledge representation formalisms descendants of semantic networks and kl one describe domain in terms of concepts classes roles relationships and individuals distinguished by formal semantics typically model theoretic decidable fragments of fol closely related to propositional modal dynamic logics provision of inference services sound and complete decision procedures for key problems implemented systems highly optimised dl architecture knowledge base tbox schema abox data man ´ human u male happy father ´ man u ۹ has child female u … john happy father hjohn maryi has child john ۶ ۱ has child inference system interface short history of description logics phase ۱ incomplete systems back classic loom . . . based on structural algorithms phase ۲ development of tableau algorithms and complexity results tableau based systems for pspace logics e.g. kris crack investigation of optimisation techniques phase ۳ tableau algorithms for very expressive dls highly optimised tableau systems for exptime logics e.g. fact dlp racer relationship to modal logic and decidable fragments of fol latest developments phase ۴ mature implementations mainstream applications and tools databases consistency of conceptual schemata eer uml etc. schema integration query subsumption w.r.t. a conceptual schema ontologies and semantic web grid and e science ontology engineering design maintenance integration reasoning with ontology based markup meta data service description and discovery commercial implementations cerebra system from network inference ltd semantic web killer app for dl reasoning history of the semantic web web was invented by tim berners lee amongst others a physicist working at cern his vision of the web was much more ambitious than the reality of the existing syntactic web this vision of the web has become known as the semantic web … a plan for achieving a set of connected applications for data on the web in such a way as to form a consistent logical web of data … … an extension of the current web in which information is given well defined meaning better enabling computers and people to work in cooperation … realising the complete vision is too hard for now probably can make a start by adding semantic annotation to web resources already seeing exciting applications of technology in e science scientific american may ۲ ۱ beware of the hype where we are today the syntactic web a place where computers do the presentation easy and people do the linking and interpreting hard why not get computers to do more of the hard work hard work using the syntactic web… find images of peter patel schneider frank van harmelen and alan rector… rev. alan m. gates associate rector of the church of the holy spirit lake forest illinois impossible using the syntactic web… complex queries involving background knowledge find information about animals that use sonar but are neither bats nor dolphins locating information in data repositories travel enquiries prices of goods and services results of human genome experiments finding and using web services visualise surface interactions between two proteins delegating complex tasks to web agents book me a holiday next weekend somewhere warm not too far away and where they speak french or english what is the problem consider a typical web page markup consists of rendering information e.g. font size and colour hyper links to related content semantic content is accessible to humans but not easily to computers… requires at least nl understanding solution add semantic markup annotations added to web pages and other web accessible resources semantics given by ontologies ontologies provide a vocabulary of terms used in annotations new terms can be formed by combining existing ones meaning semantics of such terms is formally specified need to agree on a standard web ontology language structure of an ontology ontologies typically have two distinct components names for important concepts in the domain elephant is a concept whose members are a kind of animal herbivore is a concept whose members are exactly those animals who eat only plants or parts of plants adult elephant is a concept whose members are exactly those elephants whose age is greater than ۲ years background knowledge constraints on the domain adult elephants weigh at least ۲ kg all elephants are either african elephants or indian elephants no individual can be both a herbivore and a carnivore a semantic web — first steps extend existing rendering markup with semantic markup metadata annotations that describe content funtion of web accessible resources use ontologies to provide vocabulary for annotations formal specification is accessible to machines a prerequisite is a standard web ontology language need to agree common syntax before we can share semantics syntactic web based on standards such as http and html make web resources more accessible to automated processes ontology languages for the semantic web rdf and rdfs rdf stands for resource description framework it is a w۳c candidate recommendation http www.w۳.org rdf rdf is graphical formalism xml syntax semantics for representing metadata for describing the semantics of information in a machine accessible way rdfs extends rdf with schema vocabulary e.g. class property type subclassof subpropertyof range domain rdf syntax triples xxx yyy plain litteral lexical ^^datatype jean françois baget rdf syntax graphs xxx jean françois baget rdfs rdfs vocabulary adds constraints on models e.g. ۸x y z type x y and subclassof y z type x z rdfs rdfs allows arbitrary use of schema vocabulary can be used abused to say very …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: web, semantic, ontology, reasoning, rdf, logic, …, dl, description, base, system, accessible,

این فایل پاورپوینت شامل 48 اسلاید و به زبان انگلیسی و حجم آن 2.56 مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/06/07 09:24:06 استخراج شده است.

http://www.cs.man.ac.uk/~horrocks/Slides/ICIIP/iciip.ppt

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