Publications associées à Hachage cohérent

Phonological Posterior Hashing for Query by Example Spoken Term Detection

Hervé Bourlard, Afsaneh Asaei, Dhananjay Ram

State of the art query by example spoken term detection (QbE-STD) systems in zero-resource conditions rely on representation of speech in terms of sequences of class-conditional posterior probabilities estimated by deep neural network (DNN). The posteriors ...

ISCA-INT SPEECH COMMUNICATION ASSOC2018

Method for determining the walsh-hadamard transform of n samples of a signal and apparatus for performing the same

Martin Vetterli, Robin Scheibler, Saeid Haghighatshoar

A computer-implemented method for determining the Walsh-Hadamard transform of N samples of a signal, comprises electing a plurality of hashing C matrices Σ1, . . . ΣC, computing C hashes of a particular length based at least on a hashing front end and the ...

2015

Predicting and Preventing Inconsistencies in Deployed Distributed Systems

Viktor Kuncak, Dejan Kostic, Maysam Yabandeh, Nikola Knezevic

We propose a new approach for developing and deploying distributed systems, in which nodes predict distributed consequences of their actions, and use this information to detect and avoid errors. Each node continuously runs a state exploration algorithm on ...

Association for Computing Machinery2010

CrystalBall: Predicting and Preventing Inconsistencies in Deployed Distributed Systems

Dejan Kostic, Viktor Kuncak, Maysam Yabandeh, Nikola Knezevic

We propose a new approach for developing and deploying distributed systems, in which nodes predict distributed consequences of their actions, and use this information to detect and avoid errors. Each node continuously runs a state exploration algorithm on ...

2009

CrystalBall: Predicting and Preventing Inconsistencies in Deployed Distributed Systems

Viktor Kuncak, Dejan Kostic, Maysam Yabandeh, Nikola Knezevic

We propose a new approach for developing and deploying distributed systems, in which nodes predict distributed consequences of their actions, and use this information to detect and avoid errors. Each node continuously runs a state exploration algorithm on ...

2009

Self-organized fault-tolerant routing in peer-to-peer overlays

Karl Aberer, Wojciech Galuba, Zoran Despotovic

In sufficiently large heterogeneous overlays message loss and delays are likely to occur. This has a significant impact on overlay routing, especially on longer paths. The existing solutions to this problem rely on message redundancy to mask the loss and d ...

IEEE2009

Opis: Reliable Distributed Systems in OCaml

Dejan Kostic, Viktor Kuncak, Pierre-Evariste Dagand

Concurrency and distribution pose algorithmic and implementation challenges in developing reliable distributed systems, making the field an excellent testbed for evaluating programming language and verification paradigms. Several specialized domain-specifi ...

2009

Opis: Reliable Distributed Systems in OCaml

Viktor Kuncak, Dejan Kostic, Pierre-Evariste Dagand

Concurrency and distribution pose algorithmic and implementation challenges in developing reliable distributed systems, making the field an excellent testbed for evaluating programming language and verification paradigms. Several specialized domain-specifi ...

2009

Adaptive Load Sharing for Network Processors

Jean-Yves Le Boudec

A novel scheme for processing packets in a router is presented that provides load sharing among multiple network processors distributed within the router. It is complemented by a feedback control mechanism designed to prevent processor overload. Incoming t ...

2008

A high-performance distributed hash table for peer-to-peer information retrieval

Fabius Klemm

This thesis describes our research results in the context of peer-to-peer information retrieval (P2P-IR). One goal in P2P-IR is to build a search engine for the World Wide Web (WWW) that runs on up to hundreds of thousands or even millions computers distri ...

EPFL2008

UniStore: Querying a DHT-based Universal Storage

Manfred Hauswirth, Roman Schmidt, Renault John Lecoultre, Jessica Müller

The idea of collecting and combining large public data sets and services became more and more popular. The special characteristics of such systems and the requirements of the participants demand for strictly decentralized solutions. However, this comes alo ...

2007

On Routing in Distributed Hash Tables

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

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

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

Karl Aberer, Martin Rajman, 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

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

Similarity Queries on Structured Data in Structured Overlays

Manfred Hauswirth, Roman Schmidt

Structured P2P systems based on distributed hash tables are a popular choice for building large-scaled data management systems. Generally, they only support exact match queries, but data heterogeneities often demand for more complex query types, particular ...

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

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

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

Efficient processing of XPath queries with structured overlay networks

Karl Aberer, Manfred Hauswirth, Gleb Skobeltsyn

Non-trivial search predicates beyond mere equality are at the current focus of P2P research. Structured queries, as an important type of non-trivial search, have been studied extensively mainly for unstructured P2P systems so far. As unstructured P2P syste ...

Springer Verlag2005