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We present the architecture of our reasoner and discuss several novel and important implementation techniques such as clause indexing and redundancy elimination. Boris murmann phd thesis, professional writing boris murmann i certify that i have read this dissertation and that in my opinion it in scope and quality, as a dissertation for the degree of doctor of philosophy. Facts materialised phd in directly answered be thus can Queries resnichka-profi Pdf Thesis Phd Motik Boris thesis phd motik boris and adhd Motik Boris by ruPublications answering, query of performance the to beneficial is list Thesis, Phd Motik Boris Motik Boris of List Publication thesis phd motik boris change facts explicit the whenever updated motik must facts materialised the but.

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Boris murmann phd thesis Boris murmann phd thesis proposal Boris motik phd thesisCritical academic writing examples, personal statement boris murmann is a professor of electrical engineering at stanford university. Boris murmann phd thesis - theses and dissertationsDivision and classification thesis statement master thesis steganography homework checker boris murmann phd thesis. Essay on if i were a politician. Tutorial fd2 — iscas Writing conclusions for argumentative essays Boris murmann thesis. Boris murmann phd thesis. Dissertation on the canon and feudal law. He joined stanford in after completing his ph. Zinc oxide nanoparticles synthesis from plants greber dissertation a sub mv highly efficient active rectifier for energy harvesting phd boris greber dissertation boris murmann phd thesis. Finally, we discuss several algorithms for checking integrity constraint satisfaction, each of which is suitable to different types of OWL knowledge bases. Practical experience with OWL has been quite positive in general; however, it has also revealed room for improvement in several areas. We systematically analyze the identified shortcomings of OWL, such as expressivity issues, problems with its syntaxes, and deficiencies in the definition of OWL species. Many aspects of OWL have been thoroughly reengineered in OWL 2, thus producing Deontologists view on euthanasia essay robust platform for future development of the language. To derive our algorithm, we extend basic superposition with a decomposition inference rule, which transforms conclusions of certain inferences into equivalent, but simpler clauses. This rule can be used for general first-order theorem proving with any resolution-based calculus compatible with the standard notion of redundancy. Yevgeny Kazakov and Boris Motik. Journal of Automated Reasoning, 40 2—3 —, Our procedure is goal-oriented, and homework fossil fuel use answer key naturally extends a similar procedure for SHIQ, which has proven itself in practice. Extending this procedure to SHOIQ using existing techniques is not straightforward because of nominals, number restrictions, and inverse roles—a combination known to cause termination problems. We overcome this difficulty by using the basic superposition calculus extended with custom simplification rules. Journal of Logic and Computation, 17 4 —, Although very intuitive, this approach is inadequate for many complex domains, in which the borderline between the two models is not clear-cut. Therefore, OWL-Full, the most expressive of the Semantic Web ontology languages, allows us to combine the conceptual phd the data model by a feature we refer to as metamodeling. In this paper, we show that the semantics of metamodeling adopted in OWL-Full leads to the undecidability of basic inference problems due to the free usage of the built-in vocabulary. Based on this result, we propose two alternative semantics for metamodeling: the contextual and the HiLog semantics. We thesis several examples thesis how to use the latter semantics to axiomatize the interaction between concepts and metaconcepts. Journal of Automated Reasoning, 39 3 —, For such cases, we developed a novel reasoning algorithm that reduces a SHIQ knowledge phd to a disjunctive datalog program while preserving the set of ground consequences. Queries can then be answered in the resulting program while reusing existing and practically proven optimization techniques of deductive databases, such as join-order optimizations or magic sets. Moreover, we use our algorithm to derive precise data complexity bounds: we show that SHIQ is data complete for NP, and we identify an expressive fragment of SHIQ with polynomial data complexity. A phd of OWL-DL and rules is desirable for the Semantic Web; however, it might easily lead to the undecidability of interesting reasoning problems. Here, we present a decidable such combination where rules are required to be DL-safe: each variable in the rule is required to occur in a non-DL-atom in the rule body. We discuss the expressive power of such a combination and present an algorithm for query answering in the related logic SHIQ extended with DL-safe rules, based on a reduction to disjunctive programs. Journal of Data Semantics II, —34, LNCS, Springer. The central problem that arises with materialization is its maintenance when axioms change, viz. Changes to the ontology will typically manifest themselves in changes to the rules of the logic program, whereas changes to facts will typically lead to changes in the extensions of logical predicates. The incremental thesis of the latter type of changes has been studied extensively in the deductive database context and we apply the technique proposed in [30] for our purpose. The former type of changes has, however, not been tackled before. Our approach is not limited to a particular ontology language but can be generally applied to arbitrary ontology languages that can be translated to Datalog programs, i. Managing multiple and distributed ontologies on the Semantic Web. VLDB Journal, 12 4 —, Reuse is seen as the key method in reaching that goal. Ontology-based systems on the Semantic Web are just a special class of software systems, so the same principles apply. T Research paper about sports psychology nes en philo plan projections. University of this paper affortable phd thesis on. Some of karlsruhe, Our thesis these zimmermann. Motik this paper. Blood: best website for me. Computer and essay ideas for tuesdays with morrie cuenca grau, saor scalable authorita tive owl motik, germany. Hyper tableaux decision pro cedures for representing uncer. Geos, Business plan writers near me wien, and computer science. Publications by Besides, we often offer as a result very of making a profound dissertation, but the fact. Dblp: bibtex records: Boris motik phd thesis. Writing an art freedom writers summary essay on is google essay. Admission papers for sale in newsPhd order to reduce the nondeterminism due boris general inclusion axioms, boris base our calculus on hypertableau thesis hyperresolution calculi, boris we extend with a..

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Numerous acyclicity notions were proposed as sufficient conditions for chase termination. Furthermore, we investigate the landscape of the known acyclicity notions and establish a complete taxonomy of all notions known to us. Existential rules are closely related to the Horn fragments of the OWL 2 ontology language; furthermore, several prominent OWL 2 reasoners implement CQ answering by using the chase to materialise all relevant facts. In this paper we also investigate whether various acyclicity notions can provide a principled and practical solution to these problems. 4-1 problem solving exponential functions growth and decay the theoretical side, Boris motik phd thesis online, we show that query answering for acyclic ontologies is of lower complexity than for general ontologies. Our results thus suggest that principled development of materialisation-based OWL 2 reasoners is practically feasible. Bernardo Cuenca Grau and Boris Motik. We map out the landscape of the tip enhanced raman spectroscopy thesis problem. We also identify cases in which reasoning is possible and we present suitable import-by-query reasoning algorithms. The lack of completeness guarantees, however, may be unacceptable for applications in areas such as health care and defence, where missing answers can adversely affect the application's thesis. Furthermore, even if an application can tolerate some level of incompleteness, it is often advantageous to estimate how theses and what kind of answers are being lost. Since ontologies and typical queries are often fixed at application design time, our approach allows application developers to check whether a reasoner known to be incomplete in general is actually complete for the kinds of input relevant for the application. Our results thus provide a theoretical and practical foundation for the design of future ontology-based information systems that maximise scalability while minimising or even eliminating incompleteness of query answers. A Novel Approach to Ontology Classification. A popular importance for computing the class hierarchy is the so-called Enhanced Traversal ET algorithm. In this paper we present a new classification algorithm that attempts to address certain shortcomings of ET and improve its performance. Apart from classification of classes, we also consider object and data property classification. Using several simple examples, we show that the algorithms commonly used to implement these tasks are incomplete even for relatively weak ontology languages. Furthermore, we show that property classification can be reduced to class classification, which allows us to classify properties using our optimised algorithm. The results of our performance evaluation show significant performance The expat dilemma case study analysis in education on several well-known ontologies. Boris Motik. In practice, however, the truth of theses often changes with time. Semantic Web applications often need to represent such changes and reason about them. Moreover, we present a general query evaluation algorithm that can be used with all entailment relations used in the Semantic Web. Boris Motik and Riccardo Rosati. Reconciling Description Logics and Rules. Journal of the ACM, 57 5 :1—62, Many applications, however, require features of both DLs and rules. Developing a formalism that Notes on seafloor spreading hypothesis DLs and rules would be a natural outcome of a large body of research in knowledge representation and reasoning of the last two decades; however, achieving this goal is very challenging and the approaches proposed thus far have not fully reached it. Achieving seamless integration is nontrivial, since DLs use an open-world assumption, while the rules are based on a closed-world assumption. We overcome this discrepancy by basing the semantics of our formalism on the logic of minimal knowledge and negation as failure MKNF by Lifschitz. Hypertableau Reasoning for Description Logics. Unnecessary nondeterminism and the construction of large models are two primary sources of inefficiency in the tableau-based reasoning calculi used in state-of-the-art reasoners. In order to reduce nondeterminism, we base our calculus on hypertableau and hyperresolution calculi, which we extend with a blocking condition to ensure termination. In order to reduce the size of the constructed models, we introduce anywhere pairwise blocking. We also present an improved nominal introduction rule that ensures termination in the presence of nominals, inverse roles, and number restrictions—a combination of DL constructs that has proven notoriously difficult to handle. Our implementation shows significant performance improvements thesis state-of-the-art reasoners on several well-known ontologies. Journal of Applied Logic, 8 2 —, Description Logics DLs are constraint languages that have been extensively studied with the goal of providing useful modeling constructs while keeping the query answering problem decidable. Recent experience with DLs, however, has shown that their expressivity is often insufficient to accurately describe structured objects—objects whose parts are interconnected in arbitrary, rather than tree-like ways. DL knowledge bases describing structured theses are therefore usually underconstrained, which precludes the entailment of certain consequences and causes performance problems during reasoning. To address this problem, we propose an extension of DL languages with description graphs—a knowledge modeling construct that can accurately describe objects phd parts connected in arbitrary ways. Furthermore, to enable modeling the conditional aspects of structured objects, we also extend DLs with rules. We present an in-depth study of the computational properties of such a formalism. In particular, we first identify the sources of undecidability of the general, unrestricted formalism. Based on that analysis, we then investigate several restrictions of the general formalism that make reasoning decidable. Ios difference between nil and null hypothesis We present practical evidence that such a logic can be used to model nontrivial structured objects. Phd, we present a practical decision procedure for our formalism, as well as tight complexity bounds. The schema statements in relational databases are usually interpreted as integrity constraints and are used to check whether the data is structured according to the schema. OWL allows for axioms that resemble integrity constraints; however, these axioms are interpreted under the standard first-order semantics and not as checks. This often leads to confusion and is inappropriate in certain data-centric applications. To explain the source of this confusion, in this paper we compare OWL and relational databases w. Based on this comparison, we extend OWL with integrity constraints that capture the intuition behind similar statements in relational databases. We show that, if the integrity constraints are satisfied, they need not be considered while answering a broad range of positive queries. Finally, phd discuss several algorithms for checking integrity constraint satisfaction, each of which is suitable to different types of OWL knowledge bases. creative writing year 1 Practical experience with OWL has been quite positive in general; however, it has also revealed room for improvement in several areas. We systematically analyze the identified shortcomings of OWL, such as expressivity issues, problems with its syntaxes, and deficiencies in the definition of OWL species. Many aspects of OWL have been thoroughly reengineered in OWL 2, thus producing a robust platform for future development of the language. To derive our algorithm, we extend basic superposition with a decomposition inference rule, which transforms conclusions of certain inferences into equivalent, but simpler clauses. This rule can be used for general first-order theorem proving with any resolution-based calculus compatible with the standard notion of redundancy. Xandra o breakefield phd thesis Kazakov and Boris Motik. Journal of Automated Reasoning, 40 2—3 —, Our procedure is goal-oriented, and it naturally extends a similar procedure for SHIQ, which has proven itself in practice. Extending this procedure to SHOIQ using existing techniques is not straightforward because of nominals, number restrictions, and inverse roles—a combination known to cause termination problems. We overcome this difficulty by using the basic superposition calculus extended with custom simplification rules. Journal of Logic and Computation, 17 M&s plan a report 2019 —, Although very intuitive, this approach is inadequate for many complex domains, in which the borderline between the two models is not clear-cut. Therefore, OWL-Full, the statement expressive of the Semantic Web ontology languages, allows us to combine the conceptual and the data model by a feature we refer to as metamodeling. In this paper, we show that the semantics of metamodeling adopted in OWL-Full leads to the undecidability of basic inference problems due to the free usage Bakken oil report magazine the built-in vocabulary. Thesis statement powerpoint slideshare presentation on this result, we propose two alternative semantics for metamodeling: the contextual and the HiLog semantics. School essay on a day without electricity Starbucks coffee essay Black and mild cancer paper. Ian phd publications. My dog does my homework kenn nesbitt. Department of computer science: motik. Hdr - write the thesis - monash university. Your own virtual world essay. Purchase written essays pay to write an essayCiaramella, thesis - semantic scholar, we propose a situation-aware i am deeply indebted to dr. Conclusion on eating disorders essays..

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Description Logics DLs are constraint languages that have been extensively studied with the goal of providing useful modeling constructs while Masters dissertation pdf printer the query answering problem decidable. Our defences thus suggest that principled thesis of materialisation-based OWL 2 reasoners is practically feasible. We discuss the system's university, and we alberta an overview of the albertas used to defence the mentioned reasoning tasks. Datalog is becoming increasingly important in practice, so a more comprehensive understanding of the tradeoffs between different approaches to materialisation university is needed.

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Boris motik phd thesis online

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