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Karl Aberer

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Related publications (297)

A middleware for fast and flexible sensor network deployment

Karl Aberer, Manfred Hauswirth, Ali Salehi

Proceedings of the International Conference on Very Large Data Bases (VLDB 2006)2006

Probabilistic Message Passing in Peer Data Management Systems

Philippe Cudré-Mauroux, Karl Aberer

Until recently, most data integration techniques involved central components, e.g., global schemas, to enable transparent access to heterogeneous databases. Today, however, with the democratization of tools facilitating knowledge elicitation in machine-pro ...

IEEE2006

Query Optimization in XML Structured Document Databases

Karl Aberer

2006

Distributed Cache Table: Efficient Query-Driven Processing of Multi-Term Queries in P2P Networks

Karl Aberer, Gleb Skobeltsyn

The state-of-the-art techniques for processing multi-term queries in P2P environments are query flooding and inverted list intersection. However, it has been shown that due to scalability reasons both methods fail to support full-text search in large scale ...

2006

Efficient Peer-to-Peer Belief Propagation

Karl Aberer, Roman Schmidt

2006

Congestion Control for Distributed Hash Tables

Jean-Yves Le Boudec, Karl Aberer, Fabius Klemm

Distributed Hash Tables (DHTs) provide a scalable mechanism for mapping identifiers to socket addresses. As each peer in the network can initiate lookup requests, a DHT has to process concurrently a potentially very large number of requests. In this paper, ...

IEEE2006

Middleware support for the "Internet of Things"

Karl Aberer, Manfred Hauswirth, Ali Salehi

The ``Internet of Things'' intends to enhance items of our everyday life with information and/or processing and interconnect them, so that computers can sense, integrate, present, and react on all kinds of aspects of the physical world. As this implies tha ...

5th GI/ITG KuVS Fachgespräch "Drahtlose Sensornetze"2006

Efficient Probabilistic Subsumption Checking for Content-Based Publish/Subscribe Systems

Karl Aberer, Oana Anca Jurca, Ivana Podnar

2006

Internet-scale storage systems under churn - A study of the steady state using Markov models

Karl Aberer, Anwitaman Datta

Content storage in a distributed collaborative environment uses redundancy for better resilience and thus provides good availability and durability. In a peer-to-peer environment, where peers continuously leave and rejoin the network, various lazy strategi ...

IEEE Computer Society2006

Oscar: Small-world overlay for realistic key distributions

Karl Aberer, Anwitaman Datta, Sarunas Girdzijauskas

The research on P2P systems which support skewed key distributions has rapidly advanced in the recent years. Yet, the assumptions on the skews we are dealing with remained pretty simple: most of the existing literature assumes simple monotonous key distrib ...

2006

Beyond term indexing: A P2P framework for Web information retrieval

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

Web search over peer-to-peer (P2P) networks shows promise to become an alternative to the state-of-the-art search engines since P2P overlays offer means for decentralized search across widely-distributed document collections. However, the design of effecti ...

2006

Mapping Moving Landscapes by Mining Mountains of Logs: Novel Techniques for Dependency Model Generation

Karl Aberer, Mirko Steinle, Sarunas Girdzijauskas

Problem diagnosis for distributed systems is usually difficult. Thus, an automated support is needed to identify root causes of encountered problems such as performance lags or inadequate functioning quickly. The many tools and techniques existing today th ...

2006

The Complex Facets of Reputation and Trust

Zoran Despotovic, Karl Aberer, Wojciech Galuba

Trust and reputation systems have proven to be essential to enforcing cooperative behavior in peer-to-peer networks. We briefly describe the current approaches to building reputation systems: social networks formation, probabilistic estimation and game the ...

Springer2006

Towards P2P-based Semantic Web Service Discovery with QoS Support

Karl Aberer, Manfred Hauswirth

The growing number of web services advocates distributed discovery infrastructures which are semantics-enabled and support quality of service (QoS). In this paper, we introduce a novel approach for semantic discovery of web services in P2P-based registries ...

2006

Stochasticity of probabilistic systems: Analysis methodologies case-study

Martin Hasler, Karl Aberer, Abhisek Datta

We do a case study of two different analysis techniques for studying the stochastic behavior of a randomized system/algorithms: (i) The first approach can be broadly termed as a mean value analysis (MVA), where the evolution of the mean state is studied as ...

2005

Aggregation of a Term Vocabulary for Peer-to-Peer Information Retrieval: a DHT Stress Test

Karl Aberer, Fabius Klemm

There has been an increasing research interest in developing full-text retrieval based on peer-to-peer (P2P) technology. So far, these research efforts have largely concentrated on efficiently distributing an index. However, ranking of the results retrieve ...

2005

The essence of P2P: A reference architecture for overlay networks

Karl Aberer, Manfred Hauswirth, Sarunas Girdzijauskas

The success of the P2P idea has created a huge diversity of approaches, among which overlay networks, for example, Gnutella, Kazaa, Chord, Pastry, Tapestry, P-Grid, or DKS, have received specific attention from both developers and researchers. A wide varie ...

2005

Using a Layered Markov Model for Distributed Web Ranking Computation

Jie Wu, Karl Aberer

2005

A decentralized public key infrastructure for customer-to-customer e-commerce

Karl Aberer, Anwitaman Datta, Manfred Hauswirth

Inderscience Publishers2005

Analyzing Semantic Interoperability in Bioinformatic Database Networks

Philippe Cudré-Mauroux, Karl Aberer, Julien Gaugaz, Adriana Budura

We consider the problem of analytically evaluating semantic interoperability in large-scale networks of schemas interconnected through pairwise schema mappings. Our heuristics are based on a graph-theoretic framework capturing important statistical propert ...

2005

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