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Karl Aberer

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Related publications (297)

Scalable Peer-to-Peer Web Retrieval with Highly Discriminative Keys

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

The suitability of peer-to-peer (P2P) approaches for full-text Web retrieval has recently been questioned because of the claimed unacceptable bandwidth consumption induced by retrieval from very large document collections. In this contribution we formalize ...

IEEE2007

Web Text Retrieval with a P2P Query-Driven Index

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

In this paper, we present a query-driven indexing/retrieval strategy for efficient full text retrieval from large document collections distributed within a structured P2P network. Our indexing strategy is based on two important properties: (1) the generate ...

2007

On Routing in Distributed Hash Tables

Jean-Yves Le Boudec, Karl Aberer, Sarunas Girdzijauskas, Fabius Klemm

There have been many proposals for constructing routing tables for Distributed Hash Tables (DHT). They can be classified into two groups: A) those that assume that the peers are uniformly randomly distributed in the identifier space, and B) those that allo ...

2007

From Bioinformatic Web Portals to Semantically Integrated Data Grid Networks

Philippe Cudré-Mauroux, Karl Aberer, Adriana Budura

We propose a semi-automated method for redeploying bioinformatic databases indexed in a Web portal as a decentralized, semantically integrated and service-oriented Data Grid. We generate peer-to-peer schema mappings leveraging on cross-referenced instances ...

2007

Self-Organizing Schema Mappings in the GridVine Peer Data Management System

Philippe Cudré-Mauroux, Karl Aberer, Adriana Budura, Parisa Haghani

GridVine is a Peer Data Management System based on a decentralized access structure. Built following the principle of data independence, it separates a logical layer -- where data, schemas and mappings are managed -- from a physical layer consisting of a s ...

2007

A Probabilistic Framework for Decentralized Management of Trust and Quality

Karl Aberer

In this paper, we propose a probabilistic framework targeting three important issues in the computation of quality and trust in decentralized systems. Specifically, our approach addresses the multi-dimensionality of quality and trust, taking into account c ...

Springer-Verlag2007

Generic emergent overlays in arbitrary peer identifier spaces

Karl Aberer, Wojciech Galuba

Unstructured overlay networks are driven by simple protocols that are easy to analyze and implement. The lack of structure, however, leads to weak message delivery guarantees and poor scaling. Structured overlays impose a global overlay topology that is th ...

2007

Improving the Throughput of Distributed Hash Tables Using Congestion-Aware Routing

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

Advanced applications for Distributed Hash Tables (DHTs), such as Peer-to-Peer Information Retrieval, require a DHT to quickly and efficiently process a large number (in the order of millions) of requests. In this paper we study mechanisms to optimize the ...

2007

Personalized information access in a wiki using structured tagging

Karl Aberer, Akshay Kiran Singh

Environmental engineers from different organizations work in interdisciplinary projects having the need of information exchange. In particular, a collaborative environment with personalized access to information is needed, which supports strongly varying i ...

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa2007

An Extensible and Personalized Approach to QoS-enabled Service Discovery

Karl Aberer, Manfred Hauswirth

We present an extensible and customizable framework for the autonomous discovery of Semantic Web services based on their QoS properties. Using semantic technologies, users can specify the QoS matching model and customize the ranking of services flexibly ac ...

2007

Optimal caching for first-order query load-balancing in decentralized index structures

Karl Aberer, Anwitaman Datta, Wolfgang Nejdl

Springer2007

Query-load balancing in structured overlays

Karl Aberer, Anwitaman Datta, Roman Schmidt

Query-load (forwarding and answering) balancing in structured overlays is one of the most critical and least studied problems. It has been assumed that caching heuristics can take care of it. We expose that caching, while necessary, is not in itself suffic ...

2007

Infrastructure for data processing in large-scale interconnected sensor networks

Karl Aberer, Manfred Hauswirth, Ali Salehi

With the price of wireless sensor technologies diminishing rapidly we can expect large numbers of autonomous sensor networks being deployed in the near future. These sensor networks will typically not remain isolated but the need of interconnecting them on ...

IEEE Computer Society2007

Oscar: A Data-Oriented Overlay For Heterogeneous Environments

Karl Aberer, Anwitaman Datta, Sarunas Girdzijauskas

Quite a few data-oriented overlay networks have been designed in recent years. These designs often (implicitly) assume various homogeneity which seriously limit their usability in real world. In this paper we present some performance results of the Oscar o ...

2007

Improving the Throughput of Distributed Hash Tables Using Congestion-Aware Routing

Jean-Yves Le Boudec, Karl Aberer, Dejan Kostic

2007

Message Passing in Semantic Peer-to-Peer Overlay Networks

Philippe Cudré-Mauroux, Karl Aberer

Peer-to-Peer (P2P) systems rely on machine-to-machine ad-hoc communications to offer services to a community. Contrary to the classical client-server architecture, P2P systems consider all peers, i.e., all nodes participating in the network, as being equal ...

2007

P2P Reputation Management : Probabilistic Estimation vs Social Networks

Zoran Despotovic, Karl Aberer

2006

A Search Engine for QoS-enabled Discovery of Semantic Web Services

Karl Aberer, Manfred Hauswirth

Directory services are a genuine constituent of any distributed architecture which facilitate binding attributes to names and then querying this information, that is, announcing and discovering resources. In such contexts, especially in a business environm ...

2006

A Peer-to-Peer Architecture for Information Retrieval Across Digital Library Collections

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

Peer-to-peer networks have been identified as promising architectural concept for developing search scenarios across digital library collections. Digital libraries typically offer sophisticated search over their local content, however, search methods invol ...

Springer2006

The challenges of merging two similar structured overlays: A tale of two networks

Karl Aberer, Anwitaman Datta

Structured overlay networks is an important and interesting primitive that can be used by diverse peer-to-peer applications. Multiple overlays can result either because of network partitioning or (more likely) because different groups of peers build such o ...

Springer2006

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