Recherche

Afficher tous les résultats pour

Accueil

Personne

Karl Aberer

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (297)

Handling Very Large Numbers of Messages in Distributed Hash Tables

Jean-Yves Le Boudec, Karl Aberer, Fabius Klemm, Dejan Kostic

2009

Effective Usage of Computational Trust Models in Rational Environments

Karl Aberer

Reputation-based trust models using statistical learning have been intensively studied for distributed systems where peers behave maliciously. However practical applications of such models in environments with both malicious and rational behaviors are stil ...

2008

Sensor Metadata Management and its Application in Collaborative Environmental Research

Karl Aberer, Michael Lehning, Sebastian Michel

This paper considers metadata generation and tracking in a collaborative environment where users publish raw sensor data in the form of virtual sensors and post-process data by means of filtering, modeling, or query processing techniques. In the metadata s ...

2008

ProtoPeer: from Simulation to Live Deployment in One Step

Zoran Despotovic, Karl Aberer, Wojciech Galuba

We present ProtoPeer, a peer-to-peer systems prototyping toolkit that allows for switching between the event driven simulation and live network deployment without changing any of the application code. ProtoPeer exports a set of APIs for message passing, me ...

2008

Rethinking the Design of Distributed Stream Processing Systems

Karl Aberer, Ali Salehi

In this paper, we present a novel architecture to support large scale stream processing services in a widely distributed environment. The proposed system, COSMOS, distinguishes itself by its loose coupling and communication efficiency. To exploit the shari ...

IEEE Computer Society2008

AlvisP2P: Scalable Peer-to-Peer Text Retrieval in a Structured P2P Network

Martin Rajman, Karl Aberer, Fabius Klemm, Gleb Skobeltsyn, Vinh Toan Luu, Ivana Podnar

In this paper we present the AlvisP2P IR engine, which enables efficient retrieval with multi-keyword queries from a global document collection available in a P2P network. In such a network, each peer publishes its local index and invests a part of its loc ...

2008

PicShark: Mitigating Metadata Scarcity Through Large-Scale P2P Collaboration

Philippe Cudré-Mauroux, Karl Aberer, Manfred Hauswirth, Adriana Budura

With the commoditization of digital devices, personal information and media sharing is becoming a key application on the pervasive Web. In such a context, data annotation rather than data production is the main bottleneck. Metadata scarcity represents a ma ...

2008

Toward Massive Query Optimization in Large-Scale Distributed Stream Systems

Karl Aberer

Existing distributed stream systems adopt a tightly-coupled communication paradigm and focus on fine-tuning of operator placements to achieve communication efficiency. This kind of approach is hard to scale (both to the nodes in the network and the users). ...

2008

To Tag or Not to Tag ? Harvesting Adjacent Metadata in Large-Scale Tagging Systems

Philippe Cudré-Mauroux, Karl Aberer, Adriana Budura, Sebastian Michel

We present HAMLET, a suite of principles, scoring models and algorithms to automatically propagate metadata along edges in a document neighborhood. As a showcase scenario we consider tag prediction in community-based Web 2.0 tagging applications. Experimen ...

ACM2008

Peer-to-Peer Issue Tracking System: Challenges and Solutions

Karl Aberer

Gesellschaft für Informatik2008

Top-k/w publish/subscribe: finding k most relevant publications in sliding time window w

Karl Aberer, Ivana Podnar, Kresimir Pripuzic

Existing content-based publish/subscribe systems are designed assuming that all matching publications are equally relevant to a subscription. As we cannot know in advance the distribution of publication content, the following two unwanted situations are hi ...

ACM2008

Query Driven Operator Placement for Complex Event Detection over Data Streams

Karl Aberer, Alexandre Herrmann, Oana Anca Jurca, Sebastian Michel

We consider the problem of efficiently processing subscription queries over data streams in large-scale interconnected sensor networks. We propose a scalable algorithm for distributed data stream processing, applicable on top of any platform granting acces ...

2008

LSH At Large - Distributed KNN Search in High Dimensions

Philippe Cudré-Mauroux, Karl Aberer, Parisa Haghani, Sebastian Michel

We consider K-Nearest Neighbor search for high dimensional data in large-scale structured Peer-to-Peer networks. We present an efficient mapping scheme based on p-stable Locality Sensitive Hashing to assign hash buckets to peers in a Chord-style overlay ne ...

2008

From Web 1.0 to Web 2.0 and back - How did your Grandma use to tag?

Karl Aberer, Gleb Skobeltsyn, Adriana Budura, Sebastian Michel

We consider the applicability of terms extracted from anchortext as a source of Web page descriptions in the form of tags. With a relatively simple and easy-to-use method, we show that anchortext significantly overlaps with tags obtained from the popular t ...

2008

Bandwidth-efficient delay- and loss-tolerant overlay routing

Zoran Despotovic, Karl Aberer, Wojciech Galuba

2008

Query-Driven Indexing for Peer-to-Peer Text Retrieval

Martin Rajman, Karl Aberer, Gleb Skobeltsyn, Vinh Toan Luu, Ivana Podnar

We describe a query-driven indexing framework for scalable text retrieval over structured P2P networks. To cope with the bandwidth consumption problem that has been identified as the major obstacle for full-text retrieval in P2P networks, we truncate posti ...

2007

GridVine: an Infrastructure for Peer Information Management

Philippe Cudré-Mauroux, Karl Aberer

GridVine is a semantic overlay infrastructure based on a peer-to-peer (P2P) access structure. Built following the principle of data independence, it separates a logical layer — in which data, schemas, and schema mappings are managed — from a physical layer ...

2007

Authentication-free fault-tolerant peer-to-peer service provisioning

Zoran Despotovic, Karl Aberer, Wojciech Galuba

The correct functioning of a peer-to-peer network relies on cooperative behavior of peers as service providers. Current approaches to detection and deterrence of non-cooperative behavior, such as reputation systems, rely on (1) global sharing of observatio ...

Springer2007

Efficient and Robust Secure Aggregation for Sensor Networks

Jean-Pierre Hubaux, Karl Aberer, Marcin Poturalski, Panagiotis Papadimitratos, Parisa Haghani

Wireless Sensor Networks (WSNs) rely on in-network aggregation for efficiency, however, this comes at a price: A single adversary can severely influence the outcome by contributing an arbitrary partial aggregate value. Secure in-network aggregation can det ...

2007

Zero-programming Sensor Network Deployment

Karl Aberer, Manfred Hauswirth, Ali Salehi

IEEE Computer Society2007

Page 12 sur 15