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See detailGeodasie und Hydrologie - gemeinsam zum erfolgreichen Resourcenmanagement
Weigelt, Matthias UL

Presentation (2011, November)

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See detailReading between the lines: A transnational history of the Franco-British 'entente cordiale' in postwar television
Fickers, Andreas UL; O'Dwyer, Andy

in Journal of European Television History and Culture (2011), 1(2),

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See detailHydrologische Effekte in der terrestrischen Gravimetrie
Weigelt, Matthias UL

Presentation (2011, November)

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See detailSemidefinite Relaxations of Robust Binary Least Squares under Ellipsoidal Uncertainty Sets
Tsakonas, Efthymios; Jaldén, Joakim; Ottersten, Björn UL

in IEEE Transactions on Signal Processing (2011), 59(11), 5169-5180

The problem of finding the least squares solution s to a system of equations Hs = y is considered, when s is a vector of binary variables and the coefficient matrix H is unknown but of bounded uncertainty ... [more ▼]

The problem of finding the least squares solution s to a system of equations Hs = y is considered, when s is a vector of binary variables and the coefficient matrix H is unknown but of bounded uncertainty. Similar to previous approaches to robust binary least squares, we explore the potential of a min-max design with the aim to provide solutions that are less sensitive to the uncertainty in H. We concentrate on the important case of ellipsoidal uncertainty, i.e., the matrix H is assumed to be a deterministic unknown quantity which lies in a given uncertainty ellipsoid. The resulting problem is NP-hard, yet amenable to convex approximation techniques: Starting from a convenient reformulation of the original problem, we propose an approximation algorithm based on semidefinite relaxation that explicitly accounts for the ellipsoidal uncertainty in the coefficient matrix. Next, we show that it is possible to construct a tighter relaxation by suitably changing the description of the feasible region of the problem, and formulate an approximation algorithm that performs better in practice. Interestingly, both relaxations are derived as Lagrange bidual problems corresponding to the two equivalent problem reformulations. The strength of the proposed tightened relaxation is demonstrated by pertinent simulations. [less ▲]

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See detailInhomogeneities of epitaxial chalcopyrites studied by photoluminescence
Larsen, Jes K. UL

Doctoral thesis (2011)

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See detailA Multi-Objective GRASP for Energy-aware Scheduling
Pecero, Johnatan UL; Pinel, Frédéric UL; Bouvry, Pascal UL et al

in International Congress on Computer Science Research (2011, October 28)

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See detailMémoire et oubli dans l’espace public en Serbie et en Croatie
Blondel, Cyril UL; Hervé, Clémentine

Scientific Conference (2011, October 28)

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See detailLipid and Immune Functions of the Liver X Receptors in Human Macrophages
Diwo, Janine UL

Doctoral thesis (2011)

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See detailDynamische Mathematik mit GeoGebra
Kreis, Yves UL

Speeches/Talks (2011)

Die Bildungsstandards Mathematik für die Klassen begünstigen einen entdeckenden, problemorientierten Unterricht. Dynamische Geometriesysteme (DGS) wie GeoGebra erlauben den Schüler/-innen sich mit ... [more ▼]

Die Bildungsstandards Mathematik für die Klassen begünstigen einen entdeckenden, problemorientierten Unterricht. Dynamische Geometriesysteme (DGS) wie GeoGebra erlauben den Schüler/-innen sich mit Fragestellungen auseinanderzusetzen und Hypothesen aufzustellen. Anschließend müssen diese natürlich noch immer mathematisch bewiesen werden; diese Beweise lehnen sich aber oft an den durchlaufenen Prozess der Schüler/-innen an und sind somit leichter verständlich. [less ▲]

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See detailParallel hybrid optimization methods for permutation based problems
Mehdi, Malika UL

Doctoral thesis (2011)

Solving efficiently large benchmarks of NP-hard permutation-based problems requires the development of hybrid methods combining different classes of optimization algorithms. The key challenge here is how ... [more ▼]

Solving efficiently large benchmarks of NP-hard permutation-based problems requires the development of hybrid methods combining different classes of optimization algorithms. The key challenge here is how to find connections between the divergent search strategies used in each class of methods in order to build efficient hybridization strategies. Genetic algorithms (GAs) are very popular population-based metaheuristics based on stochastic evolutionary operators. The hybridization of GAs with tree-based exact methods such as Branch-and-Bound is a promising research trend. B&B algorithms are based on an implicit enumeration of the solution space represented as a tree. Our hybridization approach consists in providing a common solution and search space coding and associated search operators enabling an efficient cooperation between the two methods. The tree-based representation of the solution space is traditionally used in B&B algorithms to enumerate the solutions of the problem at hand. In this thesis, this special representation is adapted to metaheuristics. The encoding of permutations as natural numbers, which refer to their lexicographic enumeration in the tree, is proposed as a new way to represent the solution space of permutation problems in metaheuristics. Mapping functions between the two representations and special search operators are defined for general permutation problems. This common representation allows the design of efficient cooperation strategies between GAs and B&B algorithms. The proposed hybrid schemes have been parallelized and validated on standard benchmarks of the 3D quadratic assignment problem (Q3AP) using the computational grid Grid5000. [less ▲]

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See detailGeoGebra
Hohenwarter, Markus; Borcherds, Michael; Ancsin, Gabor et al

Software (2011)

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See detailLe cerveu à l`école
Schiltz, Christine UL

Conference given outside the academic context (2011)

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See detailAxiomatizations of Lovász extensions of pseudo-Boolean functions
Couceiro, Miguel UL; Marichal, Jean-Luc UL

in Fuzzy Sets and Systems (2011), 181(1), 28-38

Three important properties in aggregation theory are investigated, namely horizontal min-additivity, horizontal max-additivity, and comonotonic additivity, which are defined by certain relaxations of the ... [more ▼]

Three important properties in aggregation theory are investigated, namely horizontal min-additivity, horizontal max-additivity, and comonotonic additivity, which are defined by certain relaxations of the Cauchy functional equation in several variables. We show that these properties are equivalent and we completely describe the functions characterized by them. By adding some regularity conditions, these functions coincide with the Lovász extensions vanishing at the origin, which subsume the discrete Choquet integrals. We also propose a simultaneous generalization of horizontal min-additivity and horizontal max-additivity, called horizontal median-additivity, and we describe the corresponding function class. Additional conditions then reduce this class to that of symmetric Lovász extensions, which includes the discrete symmetric Choquet integrals. [less ▲]

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See detailFluctuation theorems for capacitively coupled electronic currents
Cuetara, Gregory Bulnes; Esposito, Massimiliano UL; Gaspard, Pierre

in Physical Review. B (2011), 84(16),

The counting statistics of electron transport is studied theoretically in a system with two capacitively coupled parallel transport channels. Each channel is composed of a quantum dot connected by ... [more ▼]

The counting statistics of electron transport is studied theoretically in a system with two capacitively coupled parallel transport channels. Each channel is composed of a quantum dot connected by tunneling to two reservoirs. The nonequilibrium steady state of the system is controlled by two affinities or thermodynamic forces, each one determined by the two reservoirs of each channel. The status of a single-current fluctuation theorem is investigated starting from the fundamental two-current fluctuation theorem, which is a consequence of microreversibility.We show that the single-current fluctuation theorem holds in the limit of a large Coulomb repulsion between the two parallel quantum dots, as well as in the limit of a large current ratio between the parallel channels. In this latter limit, the symmetry relation of the single-current fluctuation theorem is satisfied with respect to an effective affinity that is much lower than the affinity determined by the reservoirs. This backaction effect is characterized quantitatively. [less ▲]

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See detailThe adaptation of the Baltic parliaments to the EU multilevel governance: The case of Lithuania
Pigeonnier, Anne-Sylvie UL

Presentation (2011, October 14)

While there is no lack of academic literature on national parliaments and European integration, empirical studies on the impact of the European Union on domestic legislatures are rare. This article is a ... [more ▼]

While there is no lack of academic literature on national parliaments and European integration, empirical studies on the impact of the European Union on domestic legislatures are rare. This article is a case study about the adaptation of the Baltic parliaments to the EU multilevel governance. In the 1990s, the Baltic States wishing to join the EU, their parliaments had to face the simultaneous challenges of democratisation, Europeanisation and modernisation. During the pre-Accession period they were involved in the EU matters through the transposition of the EU law and the monitoring of the Accession negotiations. Inter-parliamentary contacts with their European counterparts were developed. This facilitated the learning of “good practices” and rules established in the EU Member States parliaments. Just after the EU Accession, the legal frameworks of the Baltic Parliaments were reinforced according to the Scandinavian model of parliamentary scrutiny system on EU affairs. Legally speaking today the Baltic parliaments are more powerful actors, but some limits to their real effectiveness still exist. [less ▲]

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See detailThe Global Environment and Rural Sustainable Development: Case Study 2: Saarland
Nienaber, Birte UL; Frys, Wioletta

Scientific Conference (2011, October 12)

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