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See detailIntegrated structure and control design for mechatronic systems with configuration-dependent dynamics
Da Silva, Maíra Martins; Bruls, Olivier ULg; Desmet, Wim et al

in Mechatronics (2009), 44(9), 10161025

This paper considers the optimal design of mechatronic systems with configuration-dependent dynamics. An optimal mechatronic design requires that, among the structural and control parameters, an optimal ... [more ▼]

This paper considers the optimal design of mechatronic systems with configuration-dependent dynamics. An optimal mechatronic design requires that, among the structural and control parameters, an optimal choice has to be made with respect to design specifications in the different domains. Two main challenges are treated in this paper: the non-convex nature of the optimization problem and the difficulty in modeling serial machines with flexible components and their embedded controllers. The optimization problem is treated using the direct design strategy which considers simultaneously structural and control parameters as variables and adopts non-convex optimization algorithms. Linear time-invariant and gain-scheduling PID controllers are addressed. This methodology is exploited for the multi-objective optimization of a pick-and-place assembly robot with a gripper carried by a variable-length flexible beam. The resulting design tradeoffs between system accuracy and control efforts demonstrate the advantage of an integrated design approach for mechatronic systems with configuration-dependent dynamics. 2009 Elsevier Ltd. All rights reserved. [less ▲]

Detailed reference viewed: 154 (2 ULg)
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See detailAn integrated Surface micromachined capacitive lateral accelerometer with 2 uG/rt-Hz resolution
Xuesong, J.; Wang, F.; Kraft, Michael ULg et al

in Tech. Digest of Solid State Sensor and Actuator Workshop (2002, June)

Detailed reference viewed: 11 (0 ULg)
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See detailIntegrated system for decision help in urban mobility Management: Towards sustainable urban area development, VISUTRANS
Danoh, Charlemagne ULg; Ndiaye, Alassane-Ballé ULg; Marchal, Jean ULg

in WIT Transactions on Ecology and the Environment (2010), 142

Urban transport problems have become more widespread and severe than ever in both industrialised and developing countries alike. Facing this situation, there is a real need in developing new strategies ... [more ▼]

Urban transport problems have become more widespread and severe than ever in both industrialised and developing countries alike. Facing this situation, there is a real need in developing new strategies and innovative tools for transportation and town-planning as well as economic activities (public or private) within the area. The current tools and systems for solving transport problems are based on using several sub-management tools related to transportation infrastructures, town-planning, road traffic, environmental effects…which are not sufficiently in interaction. These solutions lead to severe handicap for urban homogenous and mastered development. That is why the “Urban mobility” has to be rethought. The main idea in this article concerns the development a multimodal, prospective and flexible tool for sustainable development of urban area which could help the decision makers in urban transportation fields. [less ▲]

Detailed reference viewed: 64 (17 ULg)
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See detailIntegrated Two-phase Drift-flux Models for Modeling Sediment Transport
Kerger, François ULg; Dewals, Benjamin ULg

in Proceedings of the Symposium on Two-phase Modelling for Sediment Dynamics in Geophysical Flows (2011, April)

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See detailAn integrated view of technical, economic and social factors influencing sustainabiligy of sixteen local European cattle breeds
Martin-Collado, D.; Diaz, C.; Choroszy, Z. et al

in Book of Abstracts of the 60th Annual Meeting of the European Association for Animal Production (2009, August)

This study aims to identify common patterns influencing dynamics and sustainability of 16 local European cattle breeds from Belgium, Estonia, Finland, France, Holland, Ireland, Italy and Spain. A broad ... [more ▼]

This study aims to identify common patterns influencing dynamics and sustainability of 16 local European cattle breeds from Belgium, Estonia, Finland, France, Holland, Ireland, Italy and Spain. A broad range of factors related to technical (e.g. farm size, cows/ha, land ownership), economic (e.g. cattle importance on farm and family income, type of market) and social (e.g. farmers and stakeholders attitude) aspects were surveyed on a total of 401 farms. Discriminant Analysis has been used to study the implications that heterogeneity within and across countries and breeds may have in making inferences in across country or breed analyses. Thus, farms were classified according to country and breeds. Then the objective was to evaluate how all factors available allow us to distinguish such classes. The analyses provided the percentage of observations (farms) that should not be included in the pre-defined groups (country and breed) according to the variables considered. When only economic variables were considered in the analyses, 36% and 59% of farms were incorrectly assigned to their country and breed, respectively. However, considering technical variables the proportions went down to 33% and 45%. Finally, when both groups of variables were considered 20% and 35% of farms were incorrectly assigned. To what extent these mismatches may allow us to identify general patterns has to be evaluated. [less ▲]

Detailed reference viewed: 71 (11 ULg)
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See detailIntegrated water management policy, the river contract in Wallonia, an experience of a participatory water management.
Rosillon, Françis ULg; Vander Borght, Paul ULg

in Coenen, Marleen; Sacile, Roberto; Meire, Patrick (Eds.) et al Integrated water management IWM-2003. Pilot study (2003)

Detailed reference viewed: 15 (2 ULg)
See detailIntegrated “omics” approaches to investigate the chemical aspects of symbiosis in termites and potential application in ligno-cellulosic use.
Bauwens, Julien ULg; Matteotti, Christel ULg; Brognaux, Alison ULg et al

Scientific conference (2010, May 05)

Cellulosic bioethanol could be one of the solutions to satisfy the increasing demand in renewable energy. The most limitative problem is the efficiency of cellulose transformation into fermentable sugars ... [more ▼]

Cellulosic bioethanol could be one of the solutions to satisfy the increasing demand in renewable energy. The most limitative problem is the efficiency of cellulose transformation into fermentable sugars. Investigations to select new glycosyl hydrolases are an interesting approach that constitutes a potential opportunity to improve the valorization of lignocellulosic materials. Three major types of glycosyl hydolases are generally produced by organism’s that are able to efficiently use cellulosic compounds: the endoglucanases, the exoglucanases/cellobiohydrolases and the β-glucosidases. In the ability to transform lignocellulosic materials by animals, symbioses are generally observed with a range of micro-organisms including bacteria, protists and/or fungi that largely (or completely) contribute to the production of the needed enzymatic complexes. In termites, such active enzymes are produced in the insect digestive tract, by the termite insect itself or by symbiotic organisms. Within lower termites gut, such as in our model Reticulitermes santonensis (Feytaud), protists and bacteria are associated and involved in a complex symbiotic system. To investigate the respective role of the insect and different groups of symbionts, multidisciplinary “omics” approaches were here developed including proteomics (ESI-LC-MS-MS, 2D-Dige gel coupled with MALDI-TOF mass spectrometry for protein identification), genomics (with a metagenomic approach based on large cDNA bank construction), metabolomics (LC-MS stragety for carbohydrate degradation product characterization). Moreover, microorganism isolation was used to investigate and characterize glycosyl hydrolases diversity and activity in R. santonensis. The integration of this broad range of “omics” techniques allowed characterizing the role of symbionts in insects in a fundamental approach and to invtigate the chemical ecology of xylophagous insects but also corresponding to an efficient way to promote the selection of efficient enzymatic activities to potentially produce biofuels based on the use of existing lignocellulosic materials. [less ▲]

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See detailDe integratie van zorgkundigen in de thuisverpleging
Moons, P.; Gosset, Christiane ULg; Beckers, Jacqueline ULg et al

Report (2009)

Detailed reference viewed: 38 (2 ULg)
See detailIntegrating axle weight restrictions in a two-dimensional vehicle routing problem with sequence based loading
Pollaris, Hanne; Braekers, Kris; Caris, An et al

Scientific conference (2014, June)

A mixed integer linear programming model for a two-dimensional capacitated vehicle routing problem (2L-CVRP) with sequence based loading and axle weight restrictions is provided. To the authors’ knowledge ... [more ▼]

A mixed integer linear programming model for a two-dimensional capacitated vehicle routing problem (2L-CVRP) with sequence based loading and axle weight restrictions is provided. To the authors’ knowledge, it is the first time that axle weight restrictions are incorporated in a VRP. Axle weight limits impose a great challenge for transportation companies. Trucks with overloaded axles represent a significant threat for traffic safety and may cause serious damage to the road surface. Transporters face high fines when violating these limits. The problem is based on a real-world problem from a Belgian logistics service provider. The demand of the customers consists of europallets. Pallets can be placed in two horizontal rows inside the vehicle. No vertical stacking is allowed. The center of gravity of the pallets inside the vehicle is calculated to determine the axle weights. Results of the model are compared to results of a 2L-CVRP with sequence based loading without axle weight restrictions. Numerical experiments demonstrate that the model performs adequately and that the integration of axle weight constraints in vehicle routing models is necessary for a feasible route planning. [less ▲]

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See detailIntegrating biological information in genome-wide association interaction (GWAI) studies.
Gusareva, Elena ULg; Van Steen, Kristel ULg

Speech/Talk (2012)

Genome-wide association (GWA) studies of Crohn's disease have identified numerous genes. However, a substantial portion of the heritability of this disease remains unexplained. Some gene variants, not ... [more ▼]

Genome-wide association (GWA) studies of Crohn's disease have identified numerous genes. However, a substantial portion of the heritability of this disease remains unexplained. Some gene variants, not detectable via main effects GWA study, may manifest themselves only in interaction with other variants. To search for interacting genes involved in the regulation of Crohn's disease, we performed GWA epistasis screening in a large human cohort (1851 cases/2938 controls) belonging to the Wellcome Trust Case Control Consortium (WTCCC). All subjects were genotyped with the GeneChip 500K Mapping Array Set (Affymetrix chip). SNPs that passed our quality control (359,479 SNPs) were processed in Biofilter (a software package that looks for candidate epistatic genes contributing to disease risk) giving rise to 14,185 SNPs. Subsequent MB-MDR epistasis screening, highlighted evidence for statistical epistasis for 6 SNP pairs. Four of these pairs involve interaction on between the HTR3B and USP28 genes (chromosome 11). One pair involves an interaction between the SLED1 and ACSL1 genes (chromosome 4). Another pair involves an interaction between PTPN22 (chromosome 1) and a SNP located between USPL1 and ALOX5AP (chromosome 13). Notably, when mapped to the same genomic regions, the interacting SNPs were not in linkage disequilibrium (r^2 < 0.11). All results were corrected for potential main SNP effects and were corrected for multiple testing on 7072 SNPs (i.e., 25,003,056 pairs). We investigated the consistency of these findings using different methodologies, including information-based, LD comparison-based and regression-based approaches. We also investigated the utility of using prior information from biological interaction data bases in novel epistasis discoveries, as well as the utility of biological data bases in interpreting a posterior identified statistical epistasis pairs. Our findings may provide new leads on important pathways involved in Crohn's disease. [less ▲]

Detailed reference viewed: 8 (1 ULg)
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See detailIntegrating coarse-scale uncertain soil moisture data into a fine-scale hydrological modelling scenario
Vernieuwe, H.; De Baets, B.; Minet, Julien ULg et al

in Hydrology and Earth System Sciences (2011), 15

Detailed reference viewed: 25 (1 ULg)
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See detailIntegrating cognitive and collective aspects of work in evaluating technology
Nyssen, Anne-Sophie ULg

in IEEE Transactions on Systems Man and Cybernetics Part A-Systems and Humans (2004), 34(6), 743-748

Ergonomic criteria are receiving increasing attention from designers but their applications do not ensure that technology matches the user's abilities, needs, and work constraints. In this paper, we used ... [more ▼]

Ergonomic criteria are receiving increasing attention from designers but their applications do not ensure that technology matches the user's abilities, needs, and work constraints. In this paper, we used two series of studies conducted in the healthcare system to illustrate how important work analysis is in evaluating new technology in order to identify critical dimensions of work and anticipate the impact of the devices on these dimensions: one looking at a new automatic drug device for anesthetists and one at a new robotic surgery system. Given the results, we developed a methodology for evaluation of new technology in complex systems. The aim is to insist to assess the impacts of technology on all the dimensions of work: technical, performance, cognitive, organizational, and economic. Which dimensions and criteria will be developed more in detail depends on the results of the work analysis. [less ▲]

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See detailIntegrating collective work aspects in the design process: An analysis case study of the robotic surgery. Using communication as a sign of fundamental change
Nyssen, Anne-Sophie ULg; Blavier, Adelaïde ULg

in Palanque, Philippe; Vanderdonck; Winckler (Eds.) Human Error, Safety and System Development (2010)

Detailed reference viewed: 64 (35 ULg)
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See detailIntegrating Corporate Sustainability Assessment, Management Accounting, Control, and Reporting
Maas, Karen; Schaltegger, Stefan; Crutzen, Nathalie ULg

in Journal of Cleaner Production (2016)

Detailed reference viewed: 14 (2 ULg)
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See detailIntegrating Experimental and Computational Fluid Dynamics approaches using Proper Orthogonal Decomposition Techniques
Andrianne, Thomas ULg; Yasue, Kanako; Guissart, Amandine ULg et al

in Progress in Aerospace Sciences (2013)

The concept of Proper Orthogonal Decomposition (POD) is used to integrate Experimental Fluid Dynamics (EFD) and Computational Fluid Dynamics (CFD) approaches. The key idea is to take advantage of the ... [more ▼]

The concept of Proper Orthogonal Decomposition (POD) is used to integrate Experimental Fluid Dynamics (EFD) and Computational Fluid Dynamics (CFD) approaches. The key idea is to take advantage of the optimality of the POD technique and its capability to extract the most energetic patterns of complex aerodynamic flow fields. First, the concept of Modal Assurance Criterion (MAC) is used to obtain a simple quantitative criterion to compare EFD measurements to CFD results. The comparison is based on the POD modes, extracted from each set of data. The analysis of the energy content of the modes allows to draw important conclusions about the role of the latter. The method is applied in the study of the flow field around a rectangular cylinder, which is either static or oscillating in a low-speed flow field. The second EFD/CFD integration technique deals with the reconstruction of a flow field from measured data, making use of CFD simulation results. The POD modes are first extracted from several CFD data sets, using a snapshot POD approach. Then the entire flow field of measured data can be reconstructed using a gappy POD method. The technique is applied to the transonic flow around a civil aircraft type wind tunnel model. The EFD measurements consist in pressure coefficient data from pressure ports or pressure-sensitive paint. It is shown that the complete flow field can be reconstructed from the pressure data with satisfactory accuracy and at relatively low computational cost. The work demonstrates the potential of the POD technique to integrate EFD and CFD data, leading to a combined, validated and complete analysis of the flow under consideration. [less ▲]

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See detailIntegrating functional MRI information into radiotherapy planning of CNS tumors-early experiences.
Árpád Kovács; Lilla Tóth; Csaba Glavák et al

in Pathology Oncology Research (2011), 17(2), 207-17

The purpose of our study was to examine the integration of functional MRI (fMRI) information into 3D based planning process of the central nervous system (CNS) malignancies. Between 01.01.2008 and 01.12 ... [more ▼]

The purpose of our study was to examine the integration of functional MRI (fMRI) information into 3D based planning process of the central nervous system (CNS) malignancies. Between 01.01.2008 and 01.12.2008 four patients with astrocytoma were enrolled to this study. Before the planning process conventional planning CT, postoperative MR and individual functional MRI examinations were delivered. For the functional MRI examination the following four types of stimulus were applied: acoustic, visual, somatosensory and numeral. Three different theoretical planning situations were applied and compared: 3D conformal plan without fMRI information, 3D conformal plan with fMRI information and IMRT plan with fMRI information. For plan comparison DVH analysis, and NTCP model were used. fMRI based OR definition resulted in 4 additional OR's in the contouring process. As these cases demonstrate, an average of 50% dose reduction was achieved in OR, OR2 and OR3 with IMRT and fMRI based 3D planning, especially in case of midline localization and big tumor extent. IMRT provides additional sparing effect in the optic tract and brainstem, especially for localizations close to the midline. Our results demonstrated that using fMRI information in conventional 3D based treatment planning potentially benefits significant dose reduction in critical organs, with no compromise in PTV coverage. fMRI can be widely used even in low grade cases (long life expectancies, lower acute and late toxicity in radiotherapy) and in cases with high grade astrocytomas or metastases (higher dose to PTV with better risk organ sparing in radiotherapy). [less ▲]

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See detailIntegrating geophysical and tracer test data for accurate solute transport modelling in heterogeneous porous media
Rentier, Céline; Brouyère, Serge ULg; Dassargues, Alain ULg

in Groundwater Quality: Natural and Enhanced Restoration of Groundwater Pollution (GQ’2001) (2002)

Detailed reference viewed: 32 (10 ULg)