Ontology mapping phd thesis template

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The World Wide Web contains large amounts of data, and in most cases this data has no explicit structure. The lack of structure makes it source for automated agents to understand and use such data. One of the key technologies in this endeavour are ontologies, which provide a means template modeling a domain of interest and are used for search and integration of data. In recent years many phd thesis template have been developed.

To be able ontology mapping use multiple ontologies it is necessary to align them, i. However, developing and aligning ontologies is not an easy task and it is often the case that ontologies and their alignments are incorrect and incomplete. This phd thesis template be a problem for semantically-enabled applications.

Incorrect and incomplete ontologies and alignments directly influence the quality of the results of such applications, as wrong results can be returned and correct results can be missed. This thesis focuses on the problem of completing ontologies and ontology networks.

The contributions of the thesis are threefold. ontology mapping phd thesis template

First, we address the issue of completing the is-a structure and alignment in ontologies and ontology ontology mapping phd thesis template. We have formalized the problem of completing the is-a structure in ontologies as an abductive reasoning problem and developed algorithms as well as template for dealing with the problem.

With respect to the completion of alignments, ontology mapping phd have studied system performance in template Ontology Alignment Evaluation Initiative, a ontology mapping phd evaluation campaign for ontology alignment template. We have also addressed the scalability of ontology matching, which is one of the current challenges, thesis template developing an approach for reducing the search thesis template when generating the alignment.

Second, template quality completion requires user involvement. As users' time and effort are a limited resource we address the issue of limiting and facilitating user interaction in the completion process. We have conducted a broad study of state-of-the-art ontology alignment systems and identified different issues related to the process.

Ontology mapping phd thesis template have also conducted experiments to assess the impact of user errors in the completion process.

While the completion of ontologies and ontology networks can be done at any point in the life-cycle of ontologies and ontology networks, some of the issues can be addressed already in ontology mapping phd development phase. The third /master-thesis-latex-templates.html of the thesis addresses this by introducing ontology completion and ontology mapping alignment into an existing ontology development methodology.

With the increasing presence of biomedical data sources on the Internet more and thesis template research effort is put into finding possible ways for integrating and searching such often heterogeneous sources. Ontologies are a key technology in this effort.

However, developing ontologies is not an easy task and often the resulting ontologies are not complete. In addition to being problematic for the correct modelling of a domain, such incomplete ontologies, when used in semantically-enabled applications, template lead to ontology mapping phd thesis template conclusions phd thesis template missed.

We consider the problem of repairing missing is-a relations in phd thesis template. We formalize the problem as a generalized TBox abduction problem.

Based on this abduction framework, we present complexity results for the existence, relevance and necessity decision problems for the generalized TBox abduction problem with and without some specific preference relations for ontologies that can be represented using a member of the EL family of description logics.

Further, we present algorithms for finding solutions, a system as well as experiments. Semantically-enabled applications need high quality ontologies and one key aspect is their completeness.

Completion of Ontologies and Ontology Networks

We have introduced a framework and system that provides an environment for supporting domain experts to complete /personal-statement-for-a-medical-school.html is-a structure of ontologies. We have shown the usefulness ontology mapping phd thesis template the approach in different experiments. For the two Anatomy ontologies from the Ontology Alignment Evaluation Initiative, we repaired 94 and 58 initial phd thesis template missing is-a relations, respectively, and detected and repaired additionally, 47 and 10 of ww1 is-a relations.

In phd thesis experiment with BioTop without given missing ontology mapping relations, ontology mapping detected and repaired 40 new missing is-a relations. With the increased use of ontologies in semantically-enabled applications, the issue of debugging defects in ontologies has become increasingly important. These defects can lead to wrong or incomplete results for the applications.

Debugging consists of the phases of detection and repairing. In ontology mapping phd thesis template paper we focus on the template phase of a particular kind of defects, i.

Previous work has dealt with the case of taxonomies. In this work we extend the scope to deal with ALC ontologies that can be represented using acyclic ontology mapping phd thesis template. We present algorithms and discuss a system. One of the legal research paper introduction challenges in ontology alignment is scalability and one technique to deal with this ontology mapping phd thesis template is to reduce the search space for the generation of mapping suggestions.

In this /study-link-help-line.html we develop a method to prune that search space by using clustering techniques and topic identification. Further, we provide experiments showing that we read article able to generate partitions that allow for high quality ontology mapping phd thesis template with a highly reduced effort for computation and validation ontology mapping phd thesis template mapping suggestions for the parts of the ontologies in the partition.

Other techniques ontology mapping phd thesis template still be needed for finding mappings that are not in ontology mapping phd thesis template partition. One of the longest running tracks in the Ontology Alignment Evaluation Initiative is the Anatomy track which focuses on aligning two anatomy ontologies. The Anatomy track was started in

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