Kunal Sengupta

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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(More)
Rarely, if ever, do parties contemplating a joint project commit resources without engaging in non-binding discussions on who does what. Here we argue that such noncommittal discussions may be essential to complete a joint project. We make this point by identifying an interesting class of situations where the private information of the two parties is such(More)
The Semantic Web journal by IOS Press follows a unique open and transparent process during which each submitted manuscript is available online together with the full history of its successive decision statuses, assigned editors, solicited and voluntary reviewers, their full text reviews, and in many cases also the authors’ response letters. Combined with a(More)
R2RML defines a language to express mappings from relational data to RDF. That way, applications built on top of the W3C Semantic Technology stack can seamlessly integrate relational data. A major obstacle to using R2RML, though, is the effort for manually curating the mappings. In particular in scenarios that aim to map data from huge and complex(More)
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(More)
The new W3C standard R2RML defines a language for expressing mappings from relational databases to RDF, allowing applications built on top of the W3C Semantic Technology stack to seamlessly integrate relational data. A major obstacle in using R2RML, though, is the creation and maintenance of mappings. In this demo, we present a novel R2RML mapping editor(More)
If people's labor-supply decisions are taken at the level of the household, it is natural to expect aggregate demand and unemployment to influence the supply curve of labor. An increase in unemployment could prompt households to send more workers out in search of work to insure against the risk of the primary worker getting unemployed (the 'added worker(More)
We study a variant of the multi-candidate Hotelling–Downs model that recognizes that politicians, even after declaring candidacy, have the option of withdrawing from the electoral contest before the election date and saving the cost of continuing campaign. We find that this natural variant significantly alters equilibrium predictions. We give conditions for(More)
The Optique project aims at developing an end-to-end system for semantic data access to Big Data in industries such as Statoil ASA and Siemens AG. In our demonstration we present the first version of the Optique system customised for the Norwegian Petroleum Directorate’s FactPages, a publicly available dataset relevant for engineers at Statoil ASA. The(More)