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See detailA hybrid human-computer approach for large-scale image-based measurements using web services and machine learning
Marée, Raphaël ULiege; Rollus, Loïc ULiege; Stevens, Benjamin ULiege et al

in Proceedings IEEE International Symposium on Biomedical Imaging (2014, May)

We present a novel methodology combining web-based software development practices, machine learning, and spatial databases for computer-aided quantification of regions of interest (ROIs) in large-scale ... [more ▼]

We present a novel methodology combining web-based software development practices, machine learning, and spatial databases for computer-aided quantification of regions of interest (ROIs) in large-scale imaging data. We describe our main methodological choices, and then illustrate the benefits of the approach (workload reduction, improved precision, scalability, and traceability) on hundreds of whole-slide images of biological tissue slices in cancer research. [less ▲]

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See detailHybrid inventory, gravimetry and altimetry (HIGA) mass balance product for Greenland and the Canadian Arctic
Colgan, W.; Abdalati, W.; Citterio, M. et al

in Remote Sensing of Environment (2015), 168

We present a novel inversion algorithm that generates a mass balance field that is simultaneously consistent with independent observations of glacier inventory derived from optical imagery, cryosphere ... [more ▼]

We present a novel inversion algorithm that generates a mass balance field that is simultaneously consistent with independent observations of glacier inventory derived from optical imagery, cryosphere-attributed mass trends derived from satellite gravimetry, and ice surface elevation trends derived from airborne and satellite altimetry. We use this algorithm to assess mass balance across Greenland and the Canadian Arctic over the Sep-2003 to Oct- 2009 period at 26 km resolution. We evaluate local algorithm-inferred mass balance against forty in situ point observations. This evaluation yields an RMSE of 0.15 mWE/a, and highlights a paucity of in situ observations from regions of high dynamic mass loss and peripheral glaciers. We assess mass losses of 212 ± 67 Gt/a to the Greenland ice sheet proper, 38 ± 11 Gt/a to peripheral glaciers in Greenland, and 42 ± 11 Gt/a to glaciers in the Canadian Arctic. These magnitudes of mass loss are dependent on the gravimetry-derived spherical harmonic mass trend we invert. We spatially partition the transient glacier continuity equation by differencing algorithm-inferred mass balance from modeled surface mass balance, in order to solve the horizontal divergence of ice flux as a residual. This residual ice dynamic field infers flux divergence (or submergent flow) in the ice sheet accumu- lation area and at tidewater margins, and flux convergence (or emergent flow) in land-terminating ablation areas, which is consistent with continuum mechanics theory. [less ▲]

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See detailHYBRID INVESTIGATION OF AIR TRANSPORT PROCESSES IN MODERATELY SLOPED STEPPED SPILLWAY FLOWS
Valero Huerta, Daniel ULiege; Bung, Daniel B.

E-print/Working paper (2015)

In stepped spillway flows, a self-aerated flow region is often found where large quantities of air may be entrained into the water body. This air is then mixed with the water phase leading to an air-water ... [more ▼]

In stepped spillway flows, a self-aerated flow region is often found where large quantities of air may be entrained into the water body. This air is then mixed with the water phase leading to an air-water mixture flow with different characteristics than the clear water flow. Thus, air entrainment is an important flow feature which needs to be considered for safe design of these hydraulic structures. Advances in the development of new air-water measurement techniques and numerical modeling capabilities allow addressing these complex problems. Computational Fluid Dynamics (CFD) modeling can be a powerful supplement for physical model tests. In the presented study, the self-aeration process and the subsequent air transport in the aerated flow region of a stepped spillway model is investigated by means of both, new experimental and numerical methods. The slope of the spillway model is 1:2 and different flow rates are considered involving a skimming flow regime. For the physical model tests, a double-tip conductivity probe and ultrasonic sensors are used to evaluate air-water flow properties and flow depths, respectively. Additionally, high-speed camera recordings help to qualitatively analyze the air-water transport. In the numerical model, the same stepped spillway is simulated with identical flow conditions. A RANS approach coupled with RNG k-ε turbulence modeling and a VOF technique for free surface tracking is used. The determination of the inception point and the entrained air quantities are estimated employing a subscale model. To verify the numerical model, results are compared to the laboratory air-water measurements. The comparison of results from both techniques helps to identify their capabilities and limitations. [less ▲]

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See detailA Hybrid IP Lookup Architecture with Fast Updates
Luo, Layong; Xie, Gaogang; Xie, Yingke et al

in Annual International Conference on Computer Communications (2012, March)

As network link rates are being pushed beyond 40 Gbps, IP lookup in high-speed routers is moving to hardware. The TCAM (Ternary Content Addressable Memory)-based IP lookup engine and the SRAM (Static ... [more ▼]

As network link rates are being pushed beyond 40 Gbps, IP lookup in high-speed routers is moving to hardware. The TCAM (Ternary Content Addressable Memory)-based IP lookup engine and the SRAM (Static Random Access Memory)- based IP lookup pipeline are the two most common ways to achieve high throughput. However, route updates in both engines degrade lookup performance and may lead to packet drops. Moreover, there is a growing interest in virtual IP routers where more frequent updates happen. Finding solutions that achieve both fast lookup and low update overhead becomes critical. In this paper, we propose a hybrid IP lookup architecture to address this challenge. The architecture is based on an efficient trie partitioning scheme that divides the Forwarding Information Base (FIB) into two prefix sets: a large disjoint leaf prefix set mapped into an external TCAM-based lookup engine and a small overlapping prefix set mapped into an on-chip SRAM-based lookup pipeline. Critical optimizations are developed on both IP lookup engines to reduce the update overhead. We show how to extend the proposed hybrid architecture to support virtual routers. Our implementation shows a throughput of 250 million lookups per second (MLPS). The update overhead is significantly lower than that of previous work and the utilization ratio of most external TCAMs is up to 100%. [less ▲]

Detailed reference viewed: 109 (18 ULiège)
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See detailHybrid lamellar silica: Combined template extraction and hydrophilic silanation
Toussaint, Gilles ULiege; Brisbois, Magali ULiege; Grandjean, Jean ULiege et al

in Journal of Colloid & Interface Science (2009), 329(1), 120-126

The surface modification of lamellar silica prepared by liquid crystal templating has been investigated. Two hydrophilic surface modifier agents, 2-glycidoxypropyltrimethoxysilane and 2-[methoxy ... [more ▼]

The surface modification of lamellar silica prepared by liquid crystal templating has been investigated. Two hydrophilic surface modifier agents, 2-glycidoxypropyltrimethoxysilane and 2-[methoxy(polyethyleneoxy)propyl)] trimethoxysilane, have been tested. Characterizations of the modified silica include thermal analysis, C-13 and Si-29 solid state NMR, transmission electron microscopy (TEM) and X-ray diffraction (XRD). The different characterizations confirmed the preservation of the lamellar morphology and the Successful surface modification with both silanes along with the template elimination. The results also indicate that the structure and length of the silanes influence the final lamellar organization as well as the grafting yields and mechanisms. (C) 2008 Elsevier Inc. All rights reserved. [less ▲]

Detailed reference viewed: 154 (38 ULiège)
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See detailHybrid Lens for Solar Concentration: Optimization of the Multilayer Diffractive Lens
Languy, Fabian ULiege; Habraken, Serge ULiege

Poster (2012)

Manufacture process degrades the ideal shape of multilayer diffractive lens due to draft angle, half radius tool and slope error. We show some shape improvements using an extended scalar theory.

Detailed reference viewed: 78 (16 ULiège)
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See detailHybrid magnetic equivalent circuit - finite element modelling of transformer fed electrical machines
Gyselinck, Johan; Dular, Patrick ULiege; Legros, Willy ULiege et al

in Compel-the International Journal for Computation and Mathematics in Electrical and Electronic Engineering (2003), 22(3), 643-658

This paper deals with the modelling of transformer supply in the two-dimensional (2D) finite element (FE) simulation of rotating electrical machines. Three different transformer models are compared The ... [more ▼]

This paper deals with the modelling of transformer supply in the two-dimensional (2D) finite element (FE) simulation of rotating electrical machines. Three different transformer models are compared The reference one is based on two 2D FE models, considering a cross-section either parallel or perpendicular to the laminations of the magnetic core. The parameters of the two other transformer models, a magnetic equivalent circuit and an electrical equivalent circuit, can be derived from the reference model Particular attention is paid to some common features of the transformer models, e.g. with regard to the inclusion of iron losses. The three models are used in the 2D FE simulation of the steady-state load operation and the starting from stand-still of an induction motor. [less ▲]

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See detailHybrid material for electromagnetic absorption
Detrembleur, Christophe ULiege; Molenberg, Isabel; Huynen, Isabelle et al

Patent (2012)

The present invention relates to a hybrid material (10) for absorbing electromagnetic radiation (60) and a method for making such a material. The hybrid material (10) comprises at least one grid panel (20 ... [more ▼]

The present invention relates to a hybrid material (10) for absorbing electromagnetic radiation (60) and a method for making such a material. The hybrid material (10) comprises at least one grid panel (20) of thickness t 1 having holes (25) traversing said thickness t 1 , at least one polymer composite material (30) of thickness t 2 filling at least partially the holes (25) of the at least one grid panel (20), said at least one polymer composite material (30) including a polymer matrix (40) and conductive particles (50) dispersed into said polymer matrix (40), characterized in that the internal surface of the holes (25) of the at least one grid panel (20) is metallic. [less ▲]

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See detailHybrid material for electromagnetic absorption
Detrembleur, Christophe ULiege; Huynen, Isabelle; Thomassin, Jean-Michel ULiege et al

Patent (2012)

The present invention relates to a hybrid material (10) for absorbing electromagnetic radiation (60) and a method for making such a material. The hybrid material (10) comprises at least one grid panel (20 ... [more ▼]

The present invention relates to a hybrid material (10) for absorbing electromagnetic radiation (60) and a method for making such a material. The hybrid material (10) comprises at least one grid panel (20) of thickness t 1 having holes (25) traversing said thickness t 1 , at least one polymer composite material (30) of thickness t 2 filling at least partially the holes (25) of the at least one grid panel (20), said at least one polymer composite material (30) including a polymer matrix (40) and conductive particles (50) dispersed into said polymer matrix (40), characterized in that the internal surface of the holes (25) of the at least one grid panel (20) is metallic. [less ▲]

Detailed reference viewed: 48 (4 ULiège)
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See detailHybrid MicroPET Imaging for Dosimetric Applications in Mice: Improvement of Activity Quantification in Dynamic MicroPET Imaging for Accelerated Dosimetry Applied to 6-[ 18 F] Fluoro- L -DOPA and 2-[ 18 F]Fluoro- L -Tyrosine
Bretin, Florian ULiege; Mauxion, T; Warnock, G et al

in Molecular Imaging and Biology (2014), 16(3), 383-394

Purpose: Dynamic microPET imaging has advantages over traditional organ harvesting, but is pronetoquantificationerrorsinsmallvolumes.Hybridimaging,wheremicroPETactivitiesarecross- calibrated using post ... [more ▼]

Purpose: Dynamic microPET imaging has advantages over traditional organ harvesting, but is pronetoquantificationerrorsinsmallvolumes.Hybridimaging,wheremicroPETactivitiesarecross- calibrated using post scan harvested organs, can improve quantification. Organ harvesting, dynamic imaging and hybrid imaging were applied to determine the human and mouse radiation dosimetry of 6-[18 F]fluoro-L-DOPA and 2-[18 F]fluoro-L-tyrosine and compared. Procedures: Two-hour dynamic microPET imaging was performed with both tracers in four separate mice for 18 F-FDOPA and three mice for 18 F-FTYR. Organ harvesting was performed at 2, 5, 10, 30, 60 and 120 min post tracer injection with n=5 at each time point for 18 F-FDOPA and n=3 at each time point for 18 F-FTYR. Human radiation dosimetry projected from animal data was calculated for the three different approaches for each tracer using OLINDA/EXM. S- factors for the MOBY phantom were used to calculate the animal dosimetry. Results: Correlations between dose estimates based on organ harvesting and imaging was improved from r=0.997 to r=0.999 for 18 F-FDOPA and from r=0.985 to r=0.996 (p<0.0001 for all) for 18 F-FTYR by using hybrid imaging. Conclusion: Hybrid imaging yields comparable results to traditional organ harvesting while partially overcoming the limitations of pure imaging. It is an advantageous technique in terms of number of animals needed and labour involved. [less ▲]

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See detailHybrid Model for Kp prediction, combining solar wind and magnetometer data
Kutiev, Ivan; Andonov, B.; Muhtarov, P. et al

Conference (2007)

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See detailHybrid model for nowcasting and forecasting the K index
Kutiev, Ivan; Muhtarov, Plamen; Andonov, Borislav et al

in Journal of Atmospheric & Solar-Terrestrial Physics (2009), 71

Detailed reference viewed: 38 (4 ULiège)
See detailA hybrid model for the simulation of angiogenesis during bone fracture healing
Geris, Liesbet ULiege; Peiffer, Veronique; Gerisch, Alf et al

in Proceedings of the 17th conference of the European Society of Biomechanics (2010)

Detailed reference viewed: 15 (1 ULiège)
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See detailHybrid modelling of dike-break induced flows
Roger, Sebastian; Dewals, Benjamin ULiege; Erpicum, Sébastien ULiege et al

in Dittrich, Andreas; Koll, Katinka; Aberle, Jochen (Eds.) et al River Flow 2010 (2010)

In a hybrid approach experimental model data are combined with results from 3D and 2D numerical modelling. The latter was conducted by two different models solving the depth-averaged shallow water ... [more ▼]

In a hybrid approach experimental model data are combined with results from 3D and 2D numerical modelling. The latter was conducted by two different models solving the depth-averaged shallow water equations. 3D computations are based on the REYNOLDS-averaged NAVIER-STOKES equations (RANS) using a volume of fluid approach to capture the free water surface. Measurements were performed on a scale model which was especially designed to reproduce the specific conditions of dike breaks. In various simulations it turned out that 2D shallow water models are able to reproduce steadystate flow patterns of dike-break induced flows and that there is a low sensitivity of the solution concerning turbulence modelling, bed and wall roughness. Nevertheless, final flow splits and breach discharges are systematically underestimated. This discrepancy seems to result from inherent modelling assumptions such as zero-vertical velocity and hydrostatic pressure distribution. Therefore, the complementary use of 3D RANS and 2D depth-averaged modelling frameworks for detailed predictions of dike-break induced flows is discussed in the present paper, based on BOUSSINESQ and pressure coefficients, which represent effects of non-uniform velocity profiles and non-hydrostatic pressure distribution over water depth, respectively. Values of these coefficients are inferred from 3D numerical results for the final steady state. [less ▲]

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See detailA hybrid optimization technique coupling an evolutionary and a local search algorithm
Kelner, Vincent ULiege; Capitanescu, Florin ULiege; Léonard, Olivier ULiege et al

in Journal of Computational & Applied Mathematics (2006), 215(2), 281-287

Evolutionary algorithms are robust and powerful global optimization techniques for solving large-scale problems that have many local optima. However, they require high CPU times, and they are very poor in ... [more ▼]

Evolutionary algorithms are robust and powerful global optimization techniques for solving large-scale problems that have many local optima. However, they require high CPU times, and they are very poor in terms of convergence performance. On the other hand, local search algorithms can converge in a few iterations but lack a global perspective. The combination of global and local search procedures should offer the advantages of both optimization methods while offsetting their disadvantages. This paper proposes a new hybrid optimization technique that merges a genetic algorithm with a local search strategy based on the interior point method. The efficiency of this hybrid approach is demonstrated by solving a constrained multi-objective mathematical test-case. [less ▲]

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See detailA hybrid optimization technique coupling evolutionary and local search algorithms
Kelner, Vincent ULiege; Capitanescu, Florin ULiege; Léonard, Olivier ULiege et al

in Journal of Computational & Applied Mathematics (2008), 215(2), 448-456

Evolutionary Algorithms are robust and powerful global optimization techniques for solving large scale problems that have many local optima. However, they require high CPU times, and they are very poor in ... [more ▼]

Evolutionary Algorithms are robust and powerful global optimization techniques for solving large scale problems that have many local optima. However, they require high CPU times, and they are very poor in terms of convergence performance. On the other hand, local search algorithms can converge in a few iterations but lack a global perspective. The combination of global and local search procedures should offer the advantages of both optimization methods while offsetting their disadvantages. This paper proposes a new hybrid optimization technique that merges a Genetic Algorithm with a local search strategy based on the Interior Point method. The efficiency of this hybrid approach is demonstrated by solving a constrained multi-objective mathematical test-case. [less ▲]

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See detailHybrid photosynthetic materials derived from microalgae Cyanidium caldarium encapsulated within silica gel
Rooke, J. C.; Léonard, Alexandre ULiege; Meunier, C. F. et al

in Journal of Colloid & Interface Science (2010), 344(2), 348-352

Cyanidium caldarium (Tilden) Geitler SAG 16.91 has been encapsulated within a porous silica host structure to target novel photosynthetic hybrid materials suitable for use in solar cells or CO2 fixation ... [more ▼]

Cyanidium caldarium (Tilden) Geitler SAG 16.91 has been encapsulated within a porous silica host structure to target novel photosynthetic hybrid materials suitable for use in solar cells or CO2 fixation. C. caldarium cells are both thermophilic and acidophilic; on account of these tolerances the hybrid materials could be employed in more extreme heat conditions. TEM highlights that the external cell membrane can remain intact after encapsulation. The images reveal an alignment of silica gel around the external membrane of the cell, providing evidence that the cell wall acts as both a nucleation and polymerisation site for silica species and that the silica scaffold formed by the aggregation of colloidal particles, generates a porosity that can facilitate the transport of nutrients towards the cell. Epifluorescence microscopy and UV-visible spectroscopy have revealed the preservation of photosynthetic apparatus post-immobilisation. Productivity studies showed how the presence of silica nanoparticles within the matrix can adversely interact with the exterior cellular structures preventing the production of oxygen through photosynthesis. © 2009 Elsevier Inc. All rights reserved. [less ▲]

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See detailHybrid places : a conceptual framework
Uyttebrouck, Constance ULiege; Teller, Jacques ULiege

Poster (2017, April 27)

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See detailHybrid processing of SCADA and synchronized phasor measurements for tracking network state
Alcaide-Moreno, Boris; Fuerte-Esquivel, Claudio; Glavic, Mevludin ULiege et al

in Proc. IEEE PES General Meeting (2015, July)

This paper proposes a new tracking state estimator aimed at following some of the dynamics of the network state (bus voltage phasors) by a hybrid processing of SCADA and synchronized phasor measurements ... [more ▼]

This paper proposes a new tracking state estimator aimed at following some of the dynamics of the network state (bus voltage phasors) by a hybrid processing of SCADA and synchronized phasor measurements. The latter are assumed to be available in limited number. To avoid time skew effects, only the SCADA measurements received since the last execution of the estimator are processed. To ensure observability, estimated SCADA measurements are used as pseudo-measurements. The procedure includes a prediction, an innovation analysis and a correction step. The latter consists of solving a constrained least-squares optimization. The simulation results refer to a test system undergoing large disturbances, evolving to long-term voltage instability or stabilized by emergency control. The proposed method appears to satisfactorily track the overall network evolution, even during those severe conditions. [less ▲]

Detailed reference viewed: 102 (21 ULiège)