Category: Seminar

Asterios will do a rehearsal of the talk he will soon give at ICWE 2012 on Thursday, July 19, at 11am, at room 445. Abstract We consider the problem of efficiently sharing large volumes of XML data based on distributed hash table overlay networks. Over the last three years, we have built ViP2P (standing for …

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14.00, room 455, PCRI Abstract Sender anonymity in location-based services (LBS) attempts to hide the identity of a mobile device user who sends requests to the LBS provider for services in her proximity (e.g. “find the nearest gas station” etc.). The goal is to keep the requester’s interests private even from attackers who (via hacking …

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The first “Oak day” took place at Château de Dampierre on June 22, 2012. Here is the schedule of the day: 9h30     Welcome coffee + pastry 10h00   Overview of the last year (Nicole + Ioana) [slides] Restructuring, arrivals, departures Who does what: responsibilities within the team, Paris Sud, Inria etc. 10h15   Melanie …

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14.00, room 455, PCRI Abstract As an essential part of the W3C’s semantic web stack and linked data initiative, RDF data management systems (also known as triplestores) have drawn a lot of research attention. The majority of these systems use value-based indexes (e.g., B+-trees) for physical storage, and ignore many of the structural aspects present …

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15.30, room 445, PCRI Abstract We introduce the database fragment of RDF, which extends the popular Description Logic fragment, in particular with support for incomplete information. We then provide novel sound and complete saturation- and reformulation-based techniques for answering the Basic Graph Pattern queries of SPARQL in this fragment. Notably, we extend the state of …

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14.00, room 455, PCRI Abstract An increasing part of the world’s data is either shared through the Web or directly produced through and for Web platforms, in particular using structured formats like XML. Cloud platforms are interesting candidates to handle large data (and document) repositories, due to their elastic scaling properties. We present NubeX, a scalable …

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14.00, room 435, PCRI Abstract Cloud computing has been massively adopted recently in many applications for its elastic scaling and fault-tolerance. At the same time, given that the amount of available RDF data sources on the Web increases rapidly, there is a constant need for scalable RDF data management tools. In this paper we propose …

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14.00, room 455, PCRI Abstract Stratosphere is an open-source platform for information management in the cloud, co-developed by TU Berlin. In this talk, I will first introduce the Stratosphere architecture, programming model, and design decisions. Then, I will present some ongoing research on optimizing data flows that consist of black-box operators with unknown semantics, and …

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14.00, room 435, PCRI Abstract The term ‘cloud computing’ is nowadays synonymous to computing services offered by large-scale infrastructures. The key to the success of cloud computing is to provide seamless and efficient management of large dynamic disseminated data collections, such as scientific data, in order to maximize their availability while minimizing capital expenditure. This …

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14.00, Room 445 at PCRI Abstract Given a set of objects O and a boolean interest function q:2^O-> {true, false}, the border of 2^O is the set of extremal (minimal or maximal) subsets o of O s.t. q(o)=true. This concept is present in many contexts, e.g., maximal frequent itemsets, functional dependencies and partial matrialization of …

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