@mastersthesis {422,
	title = {A Language for Inconsistency-Tolerant Ontology Mapping},
	volume = {Doctor of Philosophy},
	year = {2015},
	abstract = {<p>Ontology alignment plays a key role in enabling interoperability among various data sources present in the web. The nature of the world is such, that the same concepts differ in meaning, often so slightly, which makes it difficult to relate these concepts. It is the omni-present heterogeneity that is at the core of the web. The research work presented in this dissertation, is driven by the goal of providing a robust ontology alignment language for the semantic web, as we show that description logics based alignment languages are not suitable for aligning ontologies. The adoption of the semantic web technologies has been consistently on the rise over the past decade, and it continues to show promise. The core component of the semantic web is the set of knowledge representation languages -- mainly the W3C (World Wide Web Consortium) standards Web Ontology Language (OWL), Resource Description Framework (RDF), and Rule Interchange Format (RIF). While these languages have been designed in order to be suitable for the openness and extensibility of the web, they lack certain features which we try to address in this dissertation. One such missing component is the lack of non-monotonic features, in the knowledge representation languages, that enable us to perform common sense reasoning. For example, OWL supports the open world assumption (OWA), which means that knowledge about everything is assumed to be possibly incomplete at any point of time. However, experience has shown that there are situations that require us to assume that certain parts of the knowledge base are complete. Employing the Closed World Assumption (CWA) helps us achieve this. Circumscription is a very well-known approach towards CWA, which provides closed world semantics by employing the idea of minimal models with respect to certain predicates which are closed. We provide the formal semantics of the notion of Grounded Circumscription, which is an extension of circumscription with desirable properties like decidability. We also provide a tableaux calculus to reason over knowledge bases under the notion of grounded circumscription. Another form of common sense logic, is default logic. Default logic provides a way to specify rules that, by default, hold in most cases but not necessarily in all cases. The classic example of such a rule is: If something is a bird then it flies. The power of defaults comes from the ability of the logic to handle exceptions to the default rules. For example, a bird will be assumed to fly by default unless it is an exception, i.e. it belongs to a class of birds that do not fly, like penguins. Interestingly, this property of defaults can be utilized to create mappings between concepts of different ontologies (knowledge bases). We provide a new semantics for the integration of defaults in description logics and show that it improves upon previously known results in literature. In this study, we give various examples to show the utility and advantages of using a default logic based ontology alignment language. We provide the semantics and decidability results of a default based mapping language for tractable fragments of description logics (or OWL). Furthermore, we provide a proof of concept system and qualitative analysis of the results obtained from the system when compared to that of traditional mapping repair techniques.</p>
},
	author = {Kunal Sengupta}
}
@conference {415,
	title = {The Semantic Web Journal as Linked Data},
	booktitle = {International Semantic Web Conference, ISWC 2015, Posters and Demonstrations Track},
	year = {2015},
	month = {2015},
	publisher = {Springer},
	organization = {Springer},
	author = {Yingjie Hu and Krzysztof Janowicz and Pascal Hitzler and Kunal Sengupta}
}
@conference {381,
	title = {Towards Defeasible Mappings for Tractable Description Logics},
	booktitle = {ISWC 2015 - 14th International Semantic Web Conference, Bethlehem, PA, USA, October 11-15, 2015},
	year = {2015},
	pages = {237-252},
	publisher = {Springer},
	organization = {Springer},
	author = {Kunal Sengupta and Pascal Hitzler}
}
@conference {152,
	title = {How to Best Find a Partner? An Evaluation of Editing Approaches to Construct R2RML Mappings},
	booktitle = {The Semantic Web: Trends and Challenges - 11th International Conference, ESWC 2014, Anissaras, Crete, Greece, May 25-29, 2014. Proceedings},
	volume = {8465},
	year = {2014},
	pages = {675{\textendash}690},
	publisher = {Springer},
	organization = {Springer},
	author = {Christoph Pinkel and Carsten Binnig and Peter Haase and Clemens Martin and Kunal Sengupta and Johannes Trame},
	editor = {Valentina Presutti and Claudia d{\textquoteright}Amato and Fabien Gandon and Mathieu d{\textquoteright}Aquin and Steffen Staab and Anna Tordai}
}
@conference {7,
	title = {Revisiting default description logics {\textendash} and their role in aligning ontologies},
	booktitle = {Semantic Technology, 4th Joint International Conference, JIST 2014},
	volume = {8943},
	year = {2014},
	month = {11/2014},
	pages = {3-18},
	publisher = {Lecture Notes in Computer Science, Springer},
	organization = {Lecture Notes in Computer Science, Springer},
	address = {Chiang Mai, Thailand},
	abstract = {We present a new approach to extend the Web Ontology Language (OWL) with the capabilities to reason with defaults. This work improves upon the previously established results on integrating defaults with description logics (DLs), which were shown to be decidable only when the application of defaults is restricted to named individuals in the knowledge base. We demonstrate that the application of defaults (integrated with DLs) does not have to be restricted to named individuals to retain decidability and elaborate on the application of defaults in the context of ontology alignment and ontology-based systems.},
	keywords = {default logic, defaults, description logics, Ontology Alignment},
	doi = {10.1007/978-3-319-15615-6_1},
	author = {Kunal Sengupta and Pascal Hitzler and Krzysztof Janowicz},
	editor = {T. Supnithi and T. Yamaguchi and Jeff Z. Pan and V. Wuwongse and M. Buranarach}
}
@inbook {50,
	title = {Web Ontology Language (OWL)},
	booktitle = {Encyclopedia of Social Network Analysis and Mining},
	year = {2014},
	pages = {2374{\textendash}2378},
	author = {Kunal Sengupta and Pascal Hitzler},
	editor = {Reda Alhajj and Jon Rokna}
}
@conference {155,
	title = {Editing R2RML Mappings Made Easy},
	booktitle = {Proceedings of the ISWC 2013 Posters \& Demonstrations Track, Sydney, Australia, October 23, 2013},
	volume = {1035},
	year = {2013},
	pages = {101{\textendash}104},
	publisher = {CEUR-WS.org},
	organization = {CEUR-WS.org},
	author = {Kunal Sengupta and Peter Haase and Michael Schmidt and Pascal Hitzler},
	editor = {Eva Blomqvist and Tudor Groza}
}
@conference {153,
	title = {Linked Scientometrics: Designing Interactive Scientometrics with Linked Data and Semantic Web Reasoning},
	booktitle = {Proceedings of the ISWC 2013 Posters \& Demonstrations Track, Sydney, Australia, October 23, 2013},
	volume = {1035},
	year = {2013},
	pages = {53{\textendash}56},
	publisher = {CEUR-WS.org},
	organization = {CEUR-WS.org},
	author = {Grant McKenzie and Krzysztof Janowicz and Yingjie Hu and Kunal Sengupta and Pascal Hitzler},
	editor = {Eva Blomqvist and Tudor Groza}
}
@conference {49,
	title = {A Linked-Data-Driven and Semantically-Enabled Journal Portal for Scientometrics},
	booktitle = {The Semantic Web - ISWC 2013 - 12th International Semantic Web Conference, Sydney, NSW, Australia, October 21-25, 2013, Proceedings, Part II},
	volume = {8219},
	year = {2013},
	pages = {114{\textendash}129},
	publisher = {Springer},
	organization = {Springer},
	author = {Yingjie Hu and Krzysztof Janowicz and Grant McKenzie and Kunal Sengupta and Pascal Hitzler},
	editor = {Harith Alani and Lalana Kagal and Achille Fokoue and Paul T. Groth and Chris Biemann and Josiane Xavier Parreira and Lora Aroyo and Natasha F. Noy and Chris Welty and Krzysztof Janowicz}
}
@article {64,
	title = {The New Manuscript Review System for the Semantic Web Journal},
	journal = {Semantic Web},
	volume = {4},
	year = {2013},
	pages = {117},
	doi = {10.3233/SW-130095},
	url = {http://dx.doi.org/10.3233/SW-130095},
	author = {Pascal Hitzler and Krzysztof Janowicz and Kunal Sengupta}
}
@conference {154,
	title = {Optique 1.0: Semantic Access to Big Data: The Case of Norwegian Petroleum Directorate{\textquoteright}s FactPages},
	booktitle = {Proceedings of the ISWC 2013 Posters \& Demonstrations Track, Sydney, Australia, October 23, 2013},
	volume = {1035},
	year = {2013},
	pages = {65{\textendash}68},
	publisher = {CEUR-WS.org},
	organization = {CEUR-WS.org},
	author = {Evgeny Kharlamov and Martin Giese and Ernesto Jim{\'e}nez-Ruiz and Martin G. Skj{\ae}veland and Ahmet Soylu and Dmitriy Zheleznyakov and Timea Bagosi and Marco Console and Peter Haase and Ian Horrocks and Sarunas Marciuska and Christoph Pinkel and Mariano Rodriguez-Muro and Marco Ruzzi and Valerio Santarelli and Domenico Fabio Savo and Kunal Sengupta and Michael Schmidt and Evgenij Thorstensen and Johannes Trame and Arild Waaler},
	editor = {Eva Blomqvist and Tudor Groza}
}
@conference {170,
	title = {Konf Connect},
	booktitle = {Metadata Challenge at the 21st International Conference on World Wide Web (WWW 2012)},
	year = {2012},
	address = {Lyon, France},
	abstract = {<p>We present an application called Konf-Connect to improve\&nbsp;the conference attending experience of the people who attend a conference. This tool provides search facilities to nd people with similar\&nbsp;interests. The application makes use of Semantic Web dog food dataset\&nbsp;to gather information regarding the conference at hand. This is helpful for people attending the conference who are looking for networking\&nbsp;opportunities with people having expertise in the specic areas of interest. The application can also be extended to be used as general purpose\&nbsp;expert search system.</p>
},
	author = {David Carral and Joshi, Amit Krishna and Adila Krisnadhi and Raghava Mutharaju and Kunal Sengupta and Cong Wang}
}
@conference {141,
	title = {Local Closed World Semantics: Grounded Circumscription for Description Logics},
	booktitle = {Web Reasoning and Rule Systems - 5th International Conference, RR 2011, Galway, Ireland, August 29-30, 2011. Proceedings},
	volume = {6902},
	year = {2011},
	month = {08/2011},
	pages = {263-268},
	publisher = {Springer},
	organization = {Springer},
	abstract = {We present an improved local closed world extension for description logics. It is based on circumscription, and deviates from previous circumscriptive description logics in that extensions of minimized predicates may contain only extensions of named individuals in the knowledge base. Besides an (arguably) higher intuitive appeal, the improved semantics is applicable to expressive description logics without loss of decidability.},
	isbn = {978-3-642-23579-5},
	doi = {10.1007/978-3-642-23580-1},
	url = {http://dx.doi.org/10.1007/978-3-642-23580-1},
	author = {Adila Krisnadhi and Kunal Sengupta and Pascal Hitzler},
	editor = {Sebastian Rudolph and Claudio Gutierrez}
}
@conference {48,
	title = {Local Closed World Semantics: Grounded Circumscription for {OWL}},
	booktitle = {The Semantic Web - ISWC 2011 - 10th International Semantic Web Conference, Bonn, Germany, October 23-27, 2011, Proceedings, Part I},
	volume = {7031},
	year = {2011},
	month = {10/2011},
	pages = {617-632},
	publisher = {Springer},
	organization = {Springer},
	abstract = {We present a new approach to adding closed world reasoning to the Web Ontology Language OWL. It transcends previous work on circumscriptive description logics which had the drawback of yielding an undecidable logic unless severe restrictions were imposed. In particular, it was not possible, in general, to apply local closure to roles. In this paper, we provide a new approach, called grounded circumscription, which is applicable to SROIQ and other description logics around OWL without these restrictions. We show that the resulting language is decidable, and we derive an upper complexity bound. We also provide a decision procedure in the form of a tableaux algorithm.},
	doi = {10.1007/978-3-642-25073-6_39},
	author = {Kunal Sengupta and Adila Krisnadhi and Pascal Hitzler},
	editor = {Lora Aroyo and Chris Welty and Harith Alani and Jamie Taylor and Abraham Bernstein and Lalana Kagal and Natasha F. Noy and Eva Blomqvist}
}
@conference {143,
	title = {Local Closed World Semantics: Keep it simple, stupid!},
	booktitle = {Proceedings of the 24th International Workshop on Description Logics (DL 2011), Barcelona, Spain, July 13-16, 2011},
	volume = {745},
	year = {2011},
	month = {07/2011},
	publisher = {CEUR-WS.org},
	organization = {CEUR-WS.org},
	abstract = {A combination of open and closed-world reasoning (usually called local closed world reasoning) is a desirable capability of knowledge representation formalisms for Semantic Web applications. However, none of the proposals made to date for extending description logics with local closed world capabilities has had any significant impact on applications. We believe that one of the key reasons for this is that current proposals fail to provide approaches which are intuitively accessible for application developers and at the same time are applicable, as extensions, to expressive description logics such as SROIQ, which underlies the Web Ontology Language OWL. In this paper we propose a new approach which overcomes key limitations of other major proposals made to date. It is based on an adaptation of circumscriptive description logics which, in contrast to previously reported circumscription proposals, is applicable to SROIQ without rendering reasoning over the resulting language undecidable.},
	keywords = {circumscription, closed world, decidability, Description Logic},
	url = {http://ceur-ws.org/Vol-745/paper_12.pdf},
	author = {Adila Krisnadhi and Kunal Sengupta and Pascal Hitzler},
	editor = {Riccardo Rosati and Sebastian Rudolph and Michael Zakharyaschev}
}
