Publications

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https://libra.unine.ch/handle/123456789/2

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  • Publication
    Métadonnées seulement
    A Bakry-Emery criterion for self-interacting diffusions
    (: Birkhauser Boston, 2005)
    Benaim, Michel 
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    Raimond, Olivier
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    Dalang, Marco
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    Dozzi, Marco
    ;
    Russo, Francesco
    We give a Bakry-Emery type criterion for self-interacting diffusions on a compact manifold.
  • Publication
    Accès libre
    A comparison of FBG- and Brillouin-strain sensing in the framework of a decameter-scale hydraulic stimulation experiment
    (: American Rock Mechanics Association, 2018-6-18)
    Krietsch, H.
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    Gischig, V.
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    Jalali, R.
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    Doetsch, J.
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    Valley, Benoît 
    ;
    Amann, F.
    In the framework of the In-situ Stimulation and Circulation (ISC) experiment Fiber-Bragg-Grating (FBG) and Brillouin strain sensing systems were installed to monitor deformation during six hydraulic shearing and six hydraulic fracturing experiments. Three boreholes were dedicated to strain monitoring. Both systems are installed in the same boreholes, offering a unique opportunity to compare these systems with respect to their applicability in hydraulic stimulation tests. A total of 60 FBG sensors with 1 m base length were installed across fractures, shear zones and intact rock. Along the entire borehole length, pre-stressed optical cables for Brillouin distributed strain (DBS) sensing were embedded in grout with two installation methods: a bare cable and a cable packed and fixed with glue every 0.65 m. The strain signals were compared as time series for a given borehole depth and as profiles along the borehole axis. The study reveals that the FBG system gives a high accuracy (0.04 µ-strain) and temporal resolution (>1s) with pointwise measurements. The bare DBS leg yield good quantitative strain data with poorer strain accuracy (>500 times poorer than FBG) and poorer temporal resolution (factor of >100). The packed DBS leg provide no meaningful information about the strain field.
  • Publication
    Métadonnées seulement
  • Publication
    Métadonnées seulement
    A critical review of survey-based research on sustainable supply chain management
    (2009-6-16)
    Beske, Philip
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    Seuring, Stefan
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    Gold, Stefan 
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    Morana, Romy
  • Publication
    Accès libre
    A Developmental Perspective to Studying Objects in Robotic Surgery
    (: Springer International Publishing, 2016-12-9)
    Seppänen, Laura
    ;
    Kloetzer, Laure 
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    Riikonen, Jarno
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    Wahlström, Mikael
    Drawing on interventionist activity theoretical approaches, this paper describes a method of self-confrontation as a way in which to study objects in technology-mediated practices. In addition to research interests, the aim of examining the objects is to develop the capacity of professionals and organisations to work and learn better in complex technologymediated work. The method was applied in robotic surgery, in which instruments are tele-operated by a surgeon. The robot offers better, collective visualisation of the area under surgical operation than previous techniques. In particular, the paper shows how objects were revealed and new objects emerged during the intervention. We suggest that activity theoretical developmental interventions such as self-confrontations may help understand the complexity and evolution of objects, and thus contribute to studies of technology and organisations.
  • Publication
    Métadonnées seulement
    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
    Accès libre
    A dynamic model of the Aral Sea water and salt balance
    (: Elsevier Science Bv, 2003-1-10)
    Benduhn, François
    ;
    Renard, Philippe 
    The Aral Sea is shrinking rapidly since the 1960s mainly because of the diversion of the Amu Darya and Syr Darya rivers for irrigation purposes. Since then, the evaporation became the most important component of the water balance of the Sea and led to a concentration of the remaining salts. In this article, we investigate through a coupled mathematical model of water and salt balance of the Aral Sea, the dynamic evolution of the sea. The water balance considers river inflow, groundwater inflow, atmospheric precipitation and evaporation. The salt balance considers the dominant ions and the chemical precipitation of gypsum, epsomite and mirabilite. The evaporation rates are calculated with a modified Penman equation accounting for the salinity of the lake and using statistical climatic data. With this model, we obtain an estimate of the evaporation flux (between 1100 and more than 1200 mm/year depending on the salinity) larger than earlier estimates. The estimated groundwater discharge into the sea is also larger than earlier estimates and is highly variable from year to year. The last point is that the model is able to simulate rather well the evolution of the salinity until the 1980s, but it does not reproduce accurately the chemical evolution of the lake during the most recent period and needs further improvements. (C) 2004 Elsevier B.V. All fights reserved.
  • Publication
    Métadonnées seulement
    A Fast Distributed Mapping Algorithm
    (: Springer, 1990)
    Kropf, Peter 
    ;
    Boillat, J. E.
    Generating an efficient program for a parallel computer requires that the distribution of the processes on the processors comprising the parallel computer is most optimal. This paper presents a new method for a load balanced and communication optimized process distribution onto an arbitrary processor (network) topology. As opposed to many other approaches for this problem, the presented algorithm is fully distributed and based on a purely local method. It has shown to be much faster compared to the classical methods like simulated annealing, heuristic search, etc.
  • Publication
    Accès libre
    A Hybrid Algorithm for Generating Formal Concepts and Building Concept Lattice Using NextClosure and Nourine Algorithms
    (2016-7-18)
    Jabbari, Simin 
    Concept lattice produced from a set of formal concepts is used for representing concept hierarchy and has many applications in knowledge representation and data mining. Different algorithms have been proposed in the past for efficiently generating formal concepts and building concept lattices. In this paper we introduce the idea of combining existing algorithms in FCA with the aim of benefiting from their specific advantages. As an example, we propose a hybrid model that utilizes the NextClosure (NC) algorithm for generating formal concepts and parts of the Nourine algorithm for building concept lattices.We compare the proposed hybrid model with two of its counterparts: pure NC and pure Nourine. Our experiments show that the hybrid model always outperforms pure NC and for very large datasets can surpass the pure Nourine, as well.
  • Publication
    Accès libre
    A Karst Probability Map for the Western Mountain Aquifer (Israel & West Bank) using a stochastic modeling approach
    (2021-4-13)
    Banush, Sandra
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    Somogyvari, Mark
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    Sauter, Martin
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    Renard, Philippe 
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    Engelhardt, Irina
  • Publication
    Accès libre
    A Methodology for Extracting Knowledge about Controlled Vocabularies from Textual Data using FCA-Based Ontology Engineering
    (: IEEE International Conference on Bioinformatics and Biomedicine (BIBM), 2018-12-3)
    Jabbari, Simin 
    We introduce an end-to-end methodology (from text processing to querying a knowledge graph) for the sake of knowledge extraction from text corpora with a focus on a list of vocabularies of interest. We propose a pipeline that incorporates Natural Language Processing (NLP), Formal Concept Analysis (FCA), and Ontology Engineering techniques to build an ontology from textual data. We then extract the knowledge about controlled vocabularies by querying that knowledge graph, i.e., the engineered ontology. We demonstrate the significance of the proposed methodology by using it for knowledge extraction from a text corpus that consists of 800 news articles and reports about companies and products in the IT and pharmaceutical domain, where the focus is on a given list of 250 controlled vocabularies.
  • Publication
    Métadonnées seulement
    A mobility prediction system leveraging realtime location data streams: poster
    (2016-10-3)
    Kulkarni, Vaibhav
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    Moro, Arielle 
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    Garbinato, Benoît
  • Publication
    Métadonnées seulement
    A Modelling Study Of Broadband Seismic Wave Propagation In A Deep Mine
    (2014)
    Milkereit, Bernd
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    Saleh, Ramin
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    Huang, JW
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    Valley, Benoît 
  • Publication
    Accès libre
    A Novel Individually Rational Objective In Multi-Agent Multi-Armed Bandits: Algorithms and Regret Bounds
    (International Foundation for Autonomous Agents and Multiagent Systems, 2020)
    Aristide C. Y. Tossou
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    Dimitrakakis, Christos 
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    Jaroslaw Rzepecki
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    Katja Hofmann
    We study a two-player stochastic multi-armed bandit (MAB) problem with different expected rewards for each player, a generalisation of two-player general sum repeated games to stochastic rewards. Our aim is to find the egalitarian bargaining solution (EBS) for the repeated game, which can lead to much higher rewards than the maximin value of both players. Our main contribution is the derivation of an algorithm, UCRG, that achieves simultaneously for both players, a high-probability regret bound of order Õ (T2/3) after any T rounds of play. We demonstrate that our upper bound is nearly optimal by proving a lower bound of (T2/3) for any algorithm. Experiments confirm our theoretical results and the superiority of UCRG compared to the well-known explore-then-commit heuristic.
  • Publication
    Métadonnées seulement
  • Publication
    Métadonnées seulement
    A Path-Loss Model Incorporating Shadowing for THz Band Propagation in Vegetation
    (2015-9-23)
    Afsharinejad, Armita
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    Davy, Alan
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    Jennings, Brendan
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    Rasmann, Sergio 
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    Brennan, Conor