Last 7 days
Bookmark and Share    
Full Text
See detailProceedings of the 12th Workshop on Models and Algorithms for Planning and Scheduling Problems
Marchetti-Spaccamela, Alberto; Crama, Yves ULg; Goossens, Dries et al

Book published by KU Leuven (2015)

This volume contains abstracts of talks presented at the 12th Workshop on Models and Algorithms for Planning and Scheduling Problems (MAPSP 2015), held from June 8 to June 12, 2015, in La Roche-en-Ardenne ... [more ▼]

This volume contains abstracts of talks presented at the 12th Workshop on Models and Algorithms for Planning and Scheduling Problems (MAPSP 2015), held from June 8 to June 12, 2015, in La Roche-en-Ardenne, Belgium. MAPSP is a biennial workshop dedicated to all theoretical and practical aspects of scheduling, planning, and timetabling. The abstracts in this volume include 5 invited talks by Onno Boxma, Michel Goemans, Willem-Jan van Hoeve, Rolf Niedermeier, and Stephan Westphal, plus 88 contributed talks. [less ▲]

Detailed reference viewed: 20 (3 ULg)
Peer Reviewed
See detailThe ICE protocol for ecological continuity: a new tool to evaluate the upstream fish passage success at physical barriers
Ovidio, Michaël ULg; Larinier, Michel; Burgun, Vincent et al

Conference (2015, June)

The recording and classification of obstacles that can interfere with the movements and migrations of fish is critical information to plan river restoration program. To date a major problem is to ... [more ▼]

The recording and classification of obstacles that can interfere with the movements and migrations of fish is critical information to plan river restoration program. To date a major problem is to determine the potential effect of each obstacle and to select the problematic sites that should be improved to restore longitudinal connectivity (construction of fish passage facilities, removal or modification of the obstacles). Fish passage success about an obstacle is complex and depends on the hydraulic conditions over and at the foot of the obstacle in relation to swimming and leaping capabilities of the fish species concerned. This selection and classification is too often biased because managers lack information’s on the fish capabilities to leap physical obstacles. The need for a simple, reliable and standardised assessment method for use by a wide range of environmental stakeholders rapidly became evident. We responded to the challenge and developed the ICE protocol as the basis for the required ecological-continuity assessment method, particularly in the context of the European Water Framework Directive implementation. The ICE protocol coordinated by ONEMA is based on an integration of the topographical and hydraulic characteristics of obstacles with the physical capabilities (swimming, jumping or crawling) of the fish species analysed. It requires the gathering of standardised descriptive variables on each obstacle. The result of the analysis is an indication on the risks of a structure constituting a more or less severe obstacle (5 classes) for a given fish species (n=47) or group of species. Particular attention was paid to the practical aspects of the method (time required and necessary human resources) to facilitate its use in a wide variety of situations and areas. Each procedure is presented as a flow chart to assist in decision-making, thus making the protocol easy to use for a wide range of people. [less ▲]

Detailed reference viewed: 21 (2 ULg)
Full Text
See detailAssessing the passage of obstacles by fish. Concepts, design and application
Baudoin, Jean-Marc; Burgun, Vincent; Chanseau, Matthieu et al

Book published by Onema - Editeur: Véronique Barre (2015)

The fragmentation of habitats has been acknowledged for 30 years as one of the five main factors of biodiversity loss, in conjunction with pollution, overuse of natural resources, invasive species and ... [more ▼]

The fragmentation of habitats has been acknowledged for 30 years as one of the five main factors of biodiversity loss, in conjunction with pollution, overuse of natural resources, invasive species and climate change. Since then, public environmental policies have strived to restore the connectivity of natural habitats. That is particularly the case for water policy, which has made the ecological continuity of rivers a central element in policy planning, a quality element for monitoring programmes and one of the basic guidelines for river-basin management plans (RBMP). The time has thus come for decisions, with the resulting controversy given that any attempt to modify existing discontinuities impacts our perception of landscapes and various uses of aquatic environments. Given that there is, on average, at least one obstacle for every five kilometres of river in continental France, this issue concerns the entire country, its population and all water managers. That explains why it was necessary to have a single set of standardised procedures for selecting the work to be done on the basis of objective and comparable data. For the ecological continuity of fish, we now have the ICE method presented in this book, which describes obstacles in rivers and assesses the capacity of fish to overcome those obstacles during their upstream migration. The design, development and national deployment of this method required five years of intense, collective effort on the part of numerous scientists and the Onema local and regional offices. The method is the result of an outstanding multi-disciplinary approach involving both hydraulics and ecology, two disciplines that some people might see as irreconcilable, but that must work together synergistically in the effort to restore environments. The publication of this book in the Knowledge for action series marks the transition from the team that developed the method to the people who will use it to acquire better understanding of ecological continuity in rivers and as an operational tool in implementing water policy and enhancing biodiversity. [less ▲]

Detailed reference viewed: 18 (2 ULg)
Full Text
See detailOn n'est pas à une seconde près, si?
Van Der Beken, Emeline ULg

Article for general public (2015)

L'année 2015 comptera une seconde supplémentaire. Le passage du 30 juin 2015 au 1 juillet 2015 suivra la séquence temporelle suivante: 23 h 59 min 59 s, 23 h 59 min 60 s, 0 h 0 min 0 s. L'ajout de cette ... [more ▼]

L'année 2015 comptera une seconde supplémentaire. Le passage du 30 juin 2015 au 1 juillet 2015 suivra la séquence temporelle suivante: 23 h 59 min 59 s, 23 h 59 min 60 s, 0 h 0 min 0 s. L'ajout de cette seconde, dite seconde intercalaire, a pour objectif de conserver le temps légal en synchronisation avec le mouvement de rotation de la Terre sur elle-même. [less ▲]

Detailed reference viewed: 24 (7 ULg)
Full Text
Peer Reviewed
See detailEGFR and NF-kB: partners in cancer
Shostak, Kateryna ULg; Chariot, Alain ULg

in Trends in Molecular Medicine (2015), 21

Oncogenic proteins cooperate to promote tumor development and progression by sustaining cell proliferation, survival and invasiveness. Constitutive EGFR and NF-kappaB activities are seen in multiple solid ... [more ▼]

Oncogenic proteins cooperate to promote tumor development and progression by sustaining cell proliferation, survival and invasiveness. Constitutive EGFR and NF-kappaB activities are seen in multiple solid tumors and combine to provide oncogenic signals to cancer cells. Understanding how these oncogenic pathways are connected is critical, given their role in intrinsic or acquired resistance to targeted anti-cancer therapies. We review molecular mechanisms by which both EGFR- and NF-kappaB-dependent pathways establish positive loops to increase their oncogenic potential. We also describe how NF-kappaB promotes resistance to EGFR inhibitors. [less ▲]

Detailed reference viewed: 16 (1 ULg)
Full Text
See detailSmall-Angle Scattering in Porous Solids, an overview highlighting data analysis challenges
Gommes, Cédric ULg

Conference (2015, June)

Countless technologies and chemical processes make use of nanoporous materials: heterogeneous catalysis, including electrochemical reactions in fuel-cell electrodes, adsorption separation processes ... [more ▼]

Countless technologies and chemical processes make use of nanoporous materials: heterogeneous catalysis, including electrochemical reactions in fuel-cell electrodes, adsorption separation processes, kinetically selective membrane processes, are but a few examples. Nanopores are also relevant to natural processes as diverse as the weathering of rocks and ion transport through biological membranes.[1] Small-angle scattering of x-rays (SAXS) or neutrons (SANS) is one of the few experimental methods currently available for the in situ analysis of phenomena in this type of materials at the mesoscopic scale.[e.g. 2,3] In this presentation, we briefly review some recent applications of small-angle scattering to the in situ analysis of phenomena inside mesoporous solids. A particular focus is put on the data analysis challenges, whereby the scattered intensity is converted to real-space structures with nanometer resolution. [less ▲]

Detailed reference viewed: 13 (0 ULg)
Full Text
Peer Reviewed
See detailQuaternary prevention: first, do not harm - Editorial
Jamoulle, Marc ULg

in Revista Brasileira de Medicina de Família e Comunidade (2015), 10(35), 1-3

Clinical prevention, under the influence of public health, has been organised in a chronological manner since the middle of the 20th century. A paradigm shift from a chronological to a constructivist ... [more ▼]

Clinical prevention, under the influence of public health, has been organised in a chronological manner since the middle of the 20th century. A paradigm shift from a chronological to a constructivist relationship-based preventive pattern of care offers new insights into the practice of doctors. This paradigm shift brings to light the concept of quaternary prevention, a critical look at medical activities with an emphasis on the need not to harm. Quaternary prevention addresses the fundamental question of what constitutes too much or too little medicine. It is the fourth form of disease prevention, but also the fourth frame of action for family doctors [less ▲]

Detailed reference viewed: 58 (0 ULg)
Full Text
Peer Reviewed
See detailA comparative study of triaxial and uniaxial magnetic shields made out of YBCO coated conductors
Wera, Laurent ULg; Fagnard, Jean-François ULg; Levin, George et al

in Superconductor Science and Technology (2015), 28

Detailed reference viewed: 15 (3 ULg)
Full Text
Peer Reviewed
See detailPrevenção quaternária: primeiro não causar dano - Editorial
Jamoulle, Marc ULg

in Revista Brasileira de Medicina de Família e Comunidade (2015), 10(35), 1-3

A prevenção clínica, sob a influência da saúde pública, foi organizada de forma cronológica, desde meados do século XX. No entanto, uma mudança de paradigma de uma ordem cronológica para um padrão ... [more ▼]

A prevenção clínica, sob a influência da saúde pública, foi organizada de forma cronológica, desde meados do século XX. No entanto, uma mudança de paradigma de uma ordem cronológica para um padrão construtivista fundamentado em uma relação preventiva de atendimento, oferece novas,reflexões à prática dos médicos. Essa mudança de paradigma traz à tona o conceito de prevenção quaternária, um olhar crítico sobre as atividades médicas, com ênfase na necessidade de não causar danos. A prevenção quaternária aborda a questão principal do que se constitui como ‘muita’ ou ‘pouca’ medicina. Ela é a quarta forma de prevenção de doenças, e também a quarta etapa de ação dos médicos de família [less ▲]

Detailed reference viewed: 44 (2 ULg)
Full Text
Peer Reviewed
See detailThe strength of multi-row models
Louveaux, Quentin ULg; Poirrier, Laurent; Salvagnin, Domenico

in Mathematical Programming Computation (2015), 7(2), 113-148

We develop a method for computing facet-defining valid inequalities for any mixed-integer set PJ. Our practical implementation does not return only facet- defining inequalities, but it is able to find a ... [more ▼]

We develop a method for computing facet-defining valid inequalities for any mixed-integer set PJ. Our practical implementation does not return only facet- defining inequalities, but it is able to find a separating cut whenever one exists. The separator is not comparable in speed with the specific cutting-plane generators used in branch-and-cut solvers, but it is general-purpose. We can thus use it to compute cuts derived from any reasonably small relaxation PJ of a general mixed- integer problem, even when there exists no specific implementation for computing cuts with PJ. Exploiting this, we evaluate, from a computational perspective, the usefulness of cuts derived from several types of multi-row relaxations. In particular, we present results with four different strengthenings of the two-row intersection cut model, and multi-row models with up to fifteen rows. We conclude that only fully-strengthened two-row cuts seem to offer a significant advantage over two-row intersection cuts. Our results also indicate that the improvement obtained by going from models with very few rows to models with up to fifteen rows may not be worth the increased computing cost. [less ▲]

Detailed reference viewed: 48 (4 ULg)
Full Text
Peer Reviewed
See detailL’indication comme concept. La logique des « groupes althussériens » (1965-1968)
Mancuso, Eva ULg

in Cahiers du GRM (2015), VII

Detailed reference viewed: 85 (39 ULg)
Full Text
Peer Reviewed
See detailAlthusser : une nouvelle pratique de la philosophie entre politique et idéologie. Conversation avec Étienne Balibar et Yves Duroux (Partie I)
Balibar, Etienne; Duroux, Yves; Bruschi, Fabio et al

in Cahiers du GRM (2015), VII

Detailed reference viewed: 13 (0 ULg)
Full Text
Peer Reviewed
See detailLouis Althusser. Politique et subjectivité. Editorial
Bruschi, Fabio; Mancuso, Eva ULg

in Cahiers du GRM (2015), VII

Detailed reference viewed: 15 (2 ULg)
See detailNonlinear ground vibration identification of an F-16 aircraft - Part 2: Parameter estimation using a frequency-domain subspace method
Dossogne, Tilàn ULg; Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg et al

in Proceedings of the International Forum on Aeroelasticity and Structural Dynamics (2015, June)

Although they are generally modelled as linear systems, aircraft structures are known to be prone to nonlinear phenomena. A specific challenge encountered with fighter aircraft, besides aeroelastic ... [more ▼]

Although they are generally modelled as linear systems, aircraft structures are known to be prone to nonlinear phenomena. A specific challenge encountered with fighter aircraft, besides aeroelastic nonlinearity, is the modelling of the wing-to-payload mounting interfaces. For large amplitudes of vibration, friction and gaps may be triggered in these connections and markedly impact the dynamic behaviour of the complete structure. In this series of two papers, the nonlinear dynamics of an F-16 aircraft is investigated using rigorous methods applied to real data collected during a ground vibration test campaign. The present work focuses on the construction of an experimental mathematical model of the F-16 structural dynamics. A nonlinear generalisation in the frequency domain of the so-called subspace identification algorithms, termed FNSI method, is exploited to this end. The frequency response functions of the underlying linear aircraft and the coefficients of the nonlinearities are reliably estimated by this approach based on periodic random data. The use of stabilisation diagram in nonlinear system identification is also discussed. The application of the FNSI method is made challenging by the high modal density of the structure, and the complexity of the nonlinear stiffness and damping mechanisms involved within the wing-to-payload connections. [less ▲]

Detailed reference viewed: 31 (2 ULg)
See detailA frequency-domain method for identifying nonlinear vibrating structures
Noël, Jean-Philippe ULg; Dossogne, Tilàn ULg; Kerschen, Gaëtan ULg

Conference (2015, June)

System identification, which refers to the construction of mathematical models from experimental data, plays a key role in the design process of engineering systems. In structural dynamics, the ... [more ▼]

System identification, which refers to the construction of mathematical models from experimental data, plays a key role in the design process of engineering systems. In structural dynamics, the theoretical and experimental aspects of linear system identification have been successfully addressed since the early seventies, and mature analytical, computational and testing tools have emerged. Nonlinear system identification of vibrating structures has also enjoyed significant advances during the past few years. However, the common practice in industry is to ignore nonlinearities, arguably because their analysis is still regarded as impractical. The present work describes a rigorous nonlinear generalisation in the frequency domain of the classical subspace identification algorithms, termed FNSI method. This method is applicable to large-scale systems comprising strong nonlinearities, closely-spaced modes and potentially high, nonproportional damping. Another distinct advantage of the approach is that it offers a convenient way to select an appropriate order for the nonlinear model by means of stabilisation diagrams. The FNSI method is demonstrated in this study using a complete satellite structure with nonsmooth nonlinearities, and a solar panel assembly exhibiting complex nonlinear stiffness and damping mechanisms. [less ▲]

Detailed reference viewed: 23 (3 ULg)
See detailNonlinear ground vibration identification of an F-16 aircraft - Part 1: Fast nonparametric analysis of distortions in FRF measurements
Vaes, Mark; Schoukens, Johan; Peeters, Bart et al

in Proceedings of the International Forum on Aeroelasticity and Structural Dynamics (2015, June)

Although they are generally modelled as linear systems, aircraft structures are known to be prone to nonlinear phenomena. A specific challenge encountered with fighter aircraft, besides aeroelastic ... [more ▼]

Although they are generally modelled as linear systems, aircraft structures are known to be prone to nonlinear phenomena. A specific challenge encountered with fighter aircraft, besides aeroelastic nonlinearity, is the modelling of the wing-to-payload mounting interfaces. For large amplitudes of vibration, friction and gaps may be triggered in these connections and markedly impact the dynamic behaviour of the complete structure. In this series of two papers, the nonlinear dynamics of an F-16 aircraft is investigated using rigorous methods applied to real data collected during a ground vibration test campaign. The present work focuses on the detection, qualification and quantification of nonlinear distortions affecting frequency response function (FRF) measurements. The key idea of the approach is to excite the structure using a random signal with a user-defined amplitude spectrum, where only a set of well-selected frequencies is different from zero in the band of interest. It is demonstrated that this careful choice of the input frequencies allows, without any further user interaction, to quantify the importance of odd and even nonlinear distortions in the output spectra with respect to the noise level. At high excitation amplitude, the F-16 dynamics is found to exhibit substantial odd nonlinearities and less significant, yet not negligible, even nonlinearities. [less ▲]

Detailed reference viewed: 30 (1 ULg)