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See detailDecentralized local backup LSP calculation with efficient bandwidth sharing
Mélon, Laurent; Blanchy, François; Leduc, Guy ULg

(2003, February)

This paper focuses on the protection of virtual circuits (Label Switched Paths, LSPs) in a (G)MPLS (Generalised Multi-Protocol Label Switching) network. The proposed algorithm is designed to protect ... [more ▼]

This paper focuses on the protection of virtual circuits (Label Switched Paths, LSPs) in a (G)MPLS (Generalised Multi-Protocol Label Switching) network. The proposed algorithm is designed to protect traffic with strong delay requirements such as EF (Expedited Forwarding) ordered aggregates in a DiffServ domain. For this type of application endto- end recovery schemes are usually considered to be far too slow. Local, fast-rerouting is the only solution which can compete with restoration times offered by SONET self-healing ring. However local restoration has a cost in terms of extra bandwidth consumed for the backup paths. Our scheme thus includes a sophisticated resource aggregation mechanism based on the concepts of "backup-backup aggregation" and "backupprimary aggregation". The path selection algorithm is also designed to efficiently reduce the resource usage. Moreover, when considering LSPs at different preemption levels, our algorithm is able to correctly calculate the amount of bandwidth that can be preempted despite the sharing of resource. We show that our approach, though local, can compete with the state-of-theart end-to-end recovery schemes in terms of resource reservation. The major contribution of our scheme, the "backup-primary aggregation", was then also used in the context of end-to-end recovery and improved its performance substantially. [less ▲]

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See detailDecentralized mechanical ventilation with heat recovery
Aparecida Silva, Cleide; Gendebien, Samuel ULg; Hannay, Jules et al

in Proceedings of the 32nd AIVC Conference (2011, October)

A new local ventilation device is designed in such a way to procure ventilation “on demand” in each room, with a maximum of effectiveness and a minimum of energy waste. It consists in a parapipedic box to ... [more ▼]

A new local ventilation device is designed in such a way to procure ventilation “on demand” in each room, with a maximum of effectiveness and a minimum of energy waste. It consists in a parapipedic box to be located in one external wall (for example, just above a window) and containing two (injection and extraction) fans and a recovery heat exchanger. The design of the heat exchanger is associated to the selection of the two fans in view of the best compromise between heat recovery effectiveness and “auxiliary” consumptions. Great attention is paid to supply and exhaust air openings on both indoor and outdoor sides of the device, in order to get the highest ventilation effectiveness. A fair compromise is looked for between air flow control “authority” and “auxiliary” consumption. [less ▲]

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See detailDecentralized Prediction of End-to-End Network Performance Classes
Liao, Yongjun ULg; Du, Wei; Geurts, Pierre ULg et al

in Proc. of the 7th International Conference on emerging Networking EXperiments and Technologies (CoNEXT) (2011, December 08)

In large-scale networks, full-mesh active probing of end-to-end performance metrics is infeasible. Measuring a small set of pairs and predicting the others is more scalable. Under this framework, we ... [more ▼]

In large-scale networks, full-mesh active probing of end-to-end performance metrics is infeasible. Measuring a small set of pairs and predicting the others is more scalable. Under this framework, we formulate the prediction problem as matrix completion, whereby unknown entries of an incomplete matrix of pairwise measurements are to be predicted. This problem can be solved by matrix factorization because performance matrices have a low rank, thanks to the correlations among measurements. Moreover, its resolution can be fully decentralized without actually building matrices nor relying on special landmarks or central servers. In this paper we demonstrate that this approach is also applicable when the performance values are not measured exactly, but are only known to belong to one among some predefined performance classes, such as "good" and "bad". Such classification-based formulation not only fulfills the requirements of many Internet applications but also reduces the measurement cost and enables a unified treatment of various performance metrics. We propose a decentralized approach based on Stochastic Gradient Descent to solve this class-based matrix completion problem. Experiments on various datasets, relative to two kinds of metrics, show the accuracy of the approach, its robustness against erroneous measurements and its usability on peer selection. [less ▲]

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See detailDecentralized reactive power dispatch for a time-varying multi-TSO system
Phulpin, Yannick; Begovic, Miroslav; Petit, Marc et al

in Proceedings of the 42nd Hawaii International Conference on System Sciences (HICSS-42) (2009)

This paper addresses the problem of reactive power dispatch in a power system partitioned into several areas controlled by different transmission system operators. Previous research has shown that nearly ... [more ▼]

This paper addresses the problem of reactive power dispatch in a power system partitioned into several areas controlled by different transmission system operators. Previous research has shown that nearly optimal performance could be achieved in a time-invariant system by using a specific iterative decentralized control scheme with no information exchange. At each iteration of this scheme, every transmission system operator concurrently schedules its own control settings for the next iteration while representing the neighboring areas with external network equivalents. This paper focuses on some parameter tracking techniques to extend the range of application of the decentralized control scheme to time-varying systems, where the time-varying nature of the system is modeled as a succession of steady-state operating conditions with variation of the load demand. Those new techniques are evaluated in the context of IEEE 118 bus system partitioned into three control areas. [less ▲]

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See detailDecentralized tap changer blocking and load shedding against voltage instability: prospective tests on the RTE system
Capitanescu, Florin ULg; Otomega, Bogdan; Lefebvre, Hervé et al

in International Journal of Electrical Power & Energy Systems (2009), 31(9), 570-576

This paper reports on prospective tests of a system protection scheme against long-term voltage instability relying on a set of distributed controllers, each monitoring a transmission voltage, blocking ... [more ▼]

This paper reports on prospective tests of a system protection scheme against long-term voltage instability relying on a set of distributed controllers, each monitoring a transmission voltage, blocking tap changers and shedding loads in a zone. The emergency actions adjust in magnitude and location to the disturbance. Each controller acts in closed-loop, which guarantees robustness. The method is illustrated on a real-life model of the Western region of the RTE system. The choice of the controller settings is discussed in some detail and examples of performance are given, combining the above remedial action with capacitor switching and secondary voltage control. [less ▲]

Detailed reference viewed: 155 (14 ULg)
See detailDeception and the value of truth: a case study from the fifteenth century
Bauden, Frédéric ULg

Scientific conference (2014, April 13)

Detailed reference viewed: 18 (1 ULg)
See detailDécharge : un bioréacteur biologique.
Thonart, Philippe ULg; Auguste, E.; Rikir, R.

Scientific conference (1991, September)

Detailed reference viewed: 5 (1 ULg)
See detailLa decharge egale un bioreacteur a gerer.
Dumont, M.; Taillieu, X.; Destain, Jacqueline ULg et al

in Tribune de l'Eau (La) (1993), 46(564), 3-10

Detailed reference viewed: 4 (0 ULg)
See detailLa décharge, un bioréacteur à gérer - La problématique des déchets solides dans les villes africaines d'importances moyenne
Thonart, Philippe ULg; Drion, R.; Kapepula, D. et al

in Actes de l'Atelier de formation et d'échanges d'expériences "Pour un développement durable au Rwanda - Les déchets comme matières premières" (1997, June)

Detailed reference viewed: 14 (4 ULg)
See detailDécharges contrôlées de déchets ménagers : Manuel technique.
Grela; Belkhadir, R.; Xanthoulis, Dimitri ULg

Report (2002)

Detailed reference viewed: 40 (4 ULg)
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See detailLa déchéance d'un droit d'usufruit, d'usage, d'habitation ou d'emphytéose : causes et effets
Vanbrabant, Bernard ULg

in Revue Générale de Droit Civil Belge = Tijdschrift voor Belgisch Burgerlijk (2004), 1

Detailed reference viewed: 233 (6 ULg)
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See detailDéchiffrer Vénus. Renaissance et âge classique
Droixhe, Daniel ULg

in Journal de la Renaissance. IV (2006)

Detailed reference viewed: 52 (2 ULg)
Peer Reviewed
See detailDéchirures des muscles ischio-jambiers : évaluation à long terme
Croisier, Jean-Louis ULg; Pirottin, V.; Crielaard, Jean-Michel ULg

in Actes du 11ème Congrès International de Médecine du Sport (1991, October)

Detailed reference viewed: 25 (1 ULg)
See detailLes déchirures des muscles ischio-jambiers chez le footballeur : évaluation, prévention, entraînement
Croisier, Jean-Louis ULg

in Actes du 2ème Congrès Européen Olympique de la Kinésithérapie et de la Médecine du Sport (2000, November)

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See detailDechloranes: The next Emerging POP?
Brasseur, Catherine ULg; L'Homme, Benjamin ULg; PIRARD, Catherine ULg et al

Conference (2013, November)

Detailed reference viewed: 28 (7 ULg)
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See detailDecidability of invariant validation for paramaterized systems
Fontaine, Pascal; Gribomont, Pascal ULg

in Lecture Notes in Computer Science (2003), 2619

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See detailDecidability questions related to abstract numeration systems
Honkala, Juha; Rigo, Michel ULg

in Discrete Mathematics (2004), 285(1-3), 329-333

We show that some decidability questions concerning recognizable sets of integers for abstract numeration systems are equivalent to classical problems related to HD0L systems. It turns out that these ... [more ▼]

We show that some decidability questions concerning recognizable sets of integers for abstract numeration systems are equivalent to classical problems related to HD0L systems. It turns out that these problems are decidable when the sets of representations of the integers are slender regular languages. (C) 2004 Elsevier B.V. All rights reserved. [less ▲]

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See detailDécideurs, dites non à la « prime à la casse ».
Courbe, Pierre; Ozer, Pierre ULg

Article for general public (2009)

Le secteur automobile mondial se porte mal. Très mal. De mémoire de constructeur, on n’avait jamais vu cela. Les baisses de ventes enregistrées en 2008 et confirmées en janvier 2009 affolent les plus ... [more ▼]

Le secteur automobile mondial se porte mal. Très mal. De mémoire de constructeur, on n’avait jamais vu cela. Les baisses de ventes enregistrées en 2008 et confirmées en janvier 2009 affolent les plus sereins d’entre eux. La tornade ne frappe toutefois pas partout avec la même intensité. […] Une fois encore, l’environnement sert d’alibi alors que l’enjeu réel est le maintien sous perfusion d’une industrie en déclin. D’une industrie qui n’a pas su ni voulu identifier les prémices de son malaise actuel. […] [less ▲]

Detailed reference viewed: 68 (8 ULg)