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Institut d'informatique

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+41 32 718 2700
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+41 32 718 2701
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Faculté des sciences Rue Emile-Argand 11, CP 158
Code postal
2000
Ville
Neuchâtel
Pays
CH
Type d'institution
Academic Institute
Identifiants
https://libra.unine.ch/handle/123456789/15

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  • Publication
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    A dynamic approach to multi-transfer container management
    (2003)
    Bassil, Sarita 
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    Bourbeau, Benoît
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    Keller, Rudolf
    ;
    Kropf, Peter 
    This paper introduces a dynamic approach to manage the processing of client requests in a multi-transfer container transportation (MTCT) system. At the operational level, this type of system is faced with a continuously changing environment. In this context, the need for dynamic creation and adaptation of solutions is of utmost importance. The adopted approach is based on a two-layer framework that exploits workflow technology. The latter proposes a formalism to describe sequences of activities to be enacted when processing requests, hence reducing the need for manual, time-consuming management and organization. The proposed two-layer framework has a workflow layer that encapsulates the set of concurrently running workflows associated to client requests. A coordination layer is mainly responsible for the instantiation of new workflows to be inserted in the workflow layer and for modifications of running ones. These modifications are motivated by resource sharing issues or triggered by unanticipated/unexpected events. According to this two-layer framework, an implementation of a prototype for a MTCT system is finally presented.
  • Publication
    Métadonnées seulement
    Appropriately placed surface EMG electrodes reflect deep muscle activity (psoas, quadratus lumborum, abdominal wall) in the lumbar spine
    (1996-1-22)
    McGill, Stuart
    ;
    Juker, Daniel
    ;
    Kropf, Peter 
    This study tested the possibility of obtaining the activity of deeper muscles in the torso-specifically psoas, quadratus lumborum, external oblique, internal oblique and transverse abdominis, using surfce myoelectric electrodes. It was hypothesized that: (1) surface electrodes adequately represent the amplitude of deep muscles (specifically psoas, quadratus lumborum, external oblique, internal oblique, transverse abdominis); (2) a single surface electrode location would best represent the activation profiles of each deep muscle over a broad variety of tasks. We assumed that prediction of activation within 10% of maximum voluntary contraction (RMS difference between the surface and intramuscular channels), over the time history of the signal, was reasonable and acceptable to assist clinical interpretation of muscle activation amplitude, and ultimately for modeled estimates of muscle force. Surface electrodes were applied and intramuscular electrodes were inserted on the left side of the body in five men and three women who then performed a wide variety of flexor tasks (bent knee and straight leg situps and leg raises, curl ups), extensor tasks (including lifting barbells up to 70 kg), lateral bending tasks (standing lateral bend and horizontal lying side support), twisting tasks (standing and sitting), and internal/external hip rotation. Using the criteria of RMS difference and the coefficient of determination (R(2)) to compare surface with intramuscular myoelectric signals, the results indicated that selected surface electrodes adequately represent the amplitude of deep muscles-always within 15% RMS difference, or less with the exception of psoas where differences up to 20% were observed but only in certain maximum voluntary contraction efforts. It appears reasonable for spine modelers, and particularly clinicians, to assume well selected surface electrode locations provide a representation of these deeper muscles - as long as they recognize the magnitude of error for their particular application. Copyright (C) 1996 Elsevier Science Ltd.
  • Publication
    Métadonnées seulement
    UniNE at CLEF 2006: Experiments with monolingual, bilingual, and robust retrieval
    (: Springer-Verlag Berlin, 2006)
    Savoy, Jacques 
    ;
    Abdou, Samir
    ;
    Peters, Carol
    For our participation in the CLEF 2006 campaign, our first objective was to propose and evaluate a decompounding algorithm and a more aggressive stemmer for the Hungarian language. Our second objective was to obtain a better picture of the relative merit of various search engines for the French, Portuguese/ Brazilian and Bulgarian languages. To achieve this we evaluated the test-collections using the Okapi approach, some of the models derived from the Divergence from Randomness (DFR) family and a language model (LM), as well as two vector-processing approaches. In the bilingual track, we evaluated the effectiveness of various machine translation systems for a query submitted in English and automatically translated into the French and Portuguese languages. After blind query expansion, the MAP achieved by the best single MT system was around 95% for the corresponding monolingual search when French was the target language, or 83% with Portuguese. Finally, in the robust retrieval task we investigated various techniques in order to improve the retrieval performance of difficult topics.
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    Métadonnées seulement
    Experimenting with gnutella communities
    (: Springer-Verlag Berlin, 2002)
    Vaucher, Jean
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    Babin, Gilbert
    ;
    Kropf, Peter 
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    Jouve, Thierry
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    Plaice, John
    ;
    Kropf, Peter 
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    Schulthess, Peter
    ;
    Slonim, Jacob
    Computer networks or distributed systems in general may be regarded as communities where the individual components, be they entire systems, application software or users, interact in a shared environment. Such communities dynamically evolve with components or nodes joining and leaving the system. Their own individual activities affect the community's behavior and vice versa. This paper discusses various practical experiments undertaken to investigate the behavior of a real system, the Gnutella network, which represents such a community. Gnutella is a distributed Peer-to-Peer data-sharing system without any central control. It turns out that most interactions between nodes do not last long and much of their activity is devoted to finding appropriate partners in the network. The experimental results presented have been obtained from a Java implementation of Gnutella running in the open Internet environment, and thus in unknown and quickly changing network structures heavily depending on chance.
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    Rappel: Exploiting interest and network locality to improve fairness in publish-subscribe systems
    (2009-4-1)
    Patel, Jay A.
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    Rivière, Etienne 
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    Gupta, Indranil
    ;
    Kermarrec, Anne-Marie
    In this paper, we present the design, implementation and evaluation of Rappel, a peer-to-peer feed-based publish-subscribe service. By using a combination of probabilistic and gossip-like techniques and mechanisms, Rappel provides noiselessness, i.e., updates from any feed are received and relayed only by nodes that are subscribers of that feed. This leads to a fair system: the overhead at each subscriber node scales with the number and nature of its subscriptions. Moreover, Rappel incurs small publisher and client overhead, and its clients receive updates quickly and with low IP stretch. To achieve these goals, Rappel exploits “interest locality” characteristics observed amongst real multi-user multi-feed populations. This is combined with systems design decisions that enable nodes to find other subscribers, and maintain efficient network locality-aware dissemination trees. We evaluate Rappel via both trace-driven simulations and a PlanetLab deployment. The experimental results from the PlanetLab deployment show that Rappel subscribers receive updates within hundreds of milliseconds after posting. Further, results from the trace-driven simulator match our PlanetLab deployment, thus allowing us to extrapolate Rappel’s performance at larger scales.
  • Publication
    Métadonnées seulement
    When stopword lists make the difference
    (2010)
    Dolamic, Ljiljana
    ;
    Savoy, Jacques