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See detailA new three object triangulation algorithm based on the power center of three circles
Pierlot, Vincent ULg; Van Droogenbroeck, Marc ULg; Urbin-Choffray, Maxime

in Research and Education in Robotics (EUROBOT) (2011, June)

Positioning is a fundamental issue in mobile robot applications that can be achieved in multiple ways. Among these methods, triangulation is a proven technique. As it exists for a long time, many variants ... [more ▼]

Positioning is a fundamental issue in mobile robot applications that can be achieved in multiple ways. Among these methods, triangulation is a proven technique. As it exists for a long time, many variants of triangulation have been proposed. Which variant is most appropriate depends on the application because some methods ignore the beacon ordering while other have blind spots. Some methods are reliable but at a price of increasing complexity or special cases study. In this paper, we present a simple and new three object triangulation algorithm. Our algorithm works in the whole plane (except when the beacons and the robot are concyclic or colinear), and for any beacon ordering. Moreover, it does not need special cases study and has a strong geometrical meaning. Benchmarks show that our algorithm is faster than existing and comparable algorithms. Finally, a quality measure is intrinsically derived for the triangulation result in the whole plane, which can be used to identify the pathological cases, or as a validation gate in Kalman filters. [less ▲]

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See detailA New Three Object Triangulation Algorithm for Mobile Robot Positioning
Pierlot, Vincent ULg; Van Droogenbroeck, Marc ULg

in IEEE Transactions on Robotics (2014), 30(3), 566-577

Positioning is a fundamental issue in mobile robot applications. It can be achieved in many ways. Among them, triangulation based on angles measured with the help of beacons is a proven technique. Most of ... [more ▼]

Positioning is a fundamental issue in mobile robot applications. It can be achieved in many ways. Among them, triangulation based on angles measured with the help of beacons is a proven technique. Most of the many triangulation algorithms proposed so far have major limitations. For example, some of them need a particular beacon ordering, have blind spots, or only work within the triangle defined by the three beacons. More reliable methods exist; however, they have an increasing complexity or they require to handle certain spatial arrangements separately. In this paper, we present a simple and new three object triangulation algorithm, named ToTal, that natively works in the whole plane, and for any beacon ordering. We also provide a comprehensive comparison between many algorithms, and show that our algorithm is faster and simpler than comparable algorithms. In addition to its inherent efficiency, our algorithm provides a very useful and unique reliability measure, assessable anywhere in the plane, which can be used to identify pathological cases, or as a validation gate in Kalman filters. [less ▲]

Detailed reference viewed: 180 (32 ULg)
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See detailA new time domain to estimate windkessel parameters of pulmonary circulation
LAMBERMONT, Bernard ULg; GERARDP; POTTY, P et al

in American Journal of Respiratory & Critical Care Medicine (1998), 157

Detailed reference viewed: 4 (0 ULg)
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See detailA New Tool for 3D Archaeological and Epigraphic Recording
Laboury, Dimitri ULg; Moreau, Vincent

in Vergnieux, Robert (Ed.) Virtual Retrospect 2005. Actes du colloque international du CNRS organisé à Biarritz, du 8 au 19 novembre 2005 (2007)

Regarding the technological and epistemological problems raised by the necessity for Archaeology to record the precise shape of the objects of its study, the OSIRIS (Optical Systems for Interferometric ... [more ▼]

Regarding the technological and epistemological problems raised by the necessity for Archaeology to record the precise shape of the objects of its study, the OSIRIS (Optical Systems for Interferometric Relief Investigation and Scanning) project aimed to develop a device that allows by optoelectronic processes an accurate, quick and easy to use recording, dedicated to the specific and very demanding needs of archaeological research. The article explains how this new innovative device takes advantage of monochromatic light projection, polarization states splitting technique and interferometry principles to reach that goal. Some examples of its application to archaeological recording problems are also given. [less ▲]

Detailed reference viewed: 23 (2 ULg)
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See detailA new tool for measuring positive and negative occupational stress : preliminary results of validation studies.
Grisard, A.; Mahy, A.; Hansez, Isabelle ULg et al

Conference (2003, May 17)

Detailed reference viewed: 5 (0 ULg)
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See detailA new tool for METs monitoring in cardiopulmonary exercise testing. Comparison of the BodyMedia SenseWear Armband with mobile ergospirometry- preliminary results
Bury, Thierry ULg

in Abstract book of the Annual Congress of the Belgium Society of Cardiology (2007, December)

Detailed reference viewed: 14 (0 ULg)
See detailA new tool for studying the dynamics of RNA within the cell
Thiry, Marc ULg

Poster (2000)

Detailed reference viewed: 2 (0 ULg)
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See detailA new tool for testing transmitter's implantation impact on fish: the computerized video tracking
Jadot, Catherine; Donnay, Annick ULg; Ylieff, Marc ULg et al

Poster (2003, June)

Detailed reference viewed: 10 (3 ULg)
See detailA new tool for the macromolecular engineering
Detrembleur, Christophe ULg

Scientific conference (2007, January 11)

Detailed reference viewed: 3 (0 ULg)
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See detailA new tool to control meat products safety: a web based application of predictive microbiology models
Delhalle, Laurent ULg; Adolphe, Ysabelle ULg; Crevecoeur, Sébastien ULg et al

Conference (2011)

Predictive microbiology is considered by the European legislation as a tool to control food safety. Meat and meat products are particularly sensitive to contamination with pathogens. However, development ... [more ▼]

Predictive microbiology is considered by the European legislation as a tool to control food safety. Meat and meat products are particularly sensitive to contamination with pathogens. However, development of predictive microbiology models and interpretation of results require specific knowledge. A free web based model has been developed for an easy use by people who are not experts in this field as industries and public authorities. The model can simulate the growth of Salmonella spp, Listeria monocytogenes and Escherichia coli O157 in minced pork meat and on pork meat product (white pudding) under different environmental conditions. The model provides simulations under static or dynamic conditions over time. The user also has the opportunity to import the specific growth rate and cardinal parameters of a bacterium. Unlike polynomial models currently available, this free web access model is distinguished by the use of secondary square roots and primary logistic model with delay. This model permits to have a real time process management, to prospect new formulation for safer products or to design safer processes, to estimate the shelf life of a food product, etc [less ▲]

Detailed reference viewed: 126 (20 ULg)
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See detailNew tools for clinical evaluation of erythron function in man.
Cazzola, M.; Beguin, Yves ULg

in British Journal of Haematology (1992), 80(3), 278-84

Detailed reference viewed: 51 (3 ULg)
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See detailNew tools for the dairy sector based on MIR and NIR spectroscopy
Grelet, Clément ULg; Dehareng, Frédéric; Vanlierde, Amélie ULg et al

Conference (2013, November 05)

Detailed reference viewed: 35 (18 ULg)
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See detailNew Tools in Nail Disorders
Richert, Bertrand ULg; Lateur, Nadine; Theunis, Anne et al

in Seminars in Cutaneous Medicine and Surgery (2009), 28

Tumors of the nail unit may be difficult to diagnose because of the screening effect of the nail plate. In longitudinal melanonychia, several new promising techniques assist with early diagnosis of ... [more ▼]

Tumors of the nail unit may be difficult to diagnose because of the screening effect of the nail plate. In longitudinal melanonychia, several new promising techniques assist with early diagnosis of melanoma (in vivo matrix dermoscopy and immunohistochemistry) as well as sparing as much of the healthy tissues as is possible (shave biopsy technique). Diagnosing nail disorders is in some instances difficult both for the clinician and the pathologist. New tools such as polymerase chain reaction have been proposed for onychomycosis, which accounts for more than half of nail conditions, will allow quick and accurate diagnosis. However, polymerase chain reaction analysis remains expensive and is not routinely used by clinicians. Scoring nail dystrophy by clinical observation remains very subjective; therefore, severity indexes have been proposed. Another emerging noninvasive technique is forensic analysis of nail clippings for detection of drug intake and abuse, as well as exposure to environmental pollution [less ▲]

Detailed reference viewed: 22 (2 ULg)
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See detailA new topical treatment for resistant herpes simplex infections.
Snoeck, R.; Andrei, G.; De Clercq, E. et al

in New England Journal of Medicine [=NEJM] (1993), 329(13), 968-9

Detailed reference viewed: 15 (0 ULg)
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See detailA new tracer technique for monitoring groundwater fluxes : the finite volume point dilution method
Brouyère, Serge ULg; Batlle-Aguilar, Jordi; Goderniaux, Pascal ULg et al

Conference (2008, June 06)

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See detailA New Tracer Technique for Monitoring Groundwater Fluxes: The Finite Volume Point Dilution Method
Brouyère, Serge ULg; Batlle-Aguilar, Jordi; Goderniaux, Pascal ULg et al

in Journal of Contaminant Hydrology (2008), 95(3-4), 121-40

Quantification of pollutant mass fluxes is essential for assessing the impact of contaminated sites on their surrounding environment, particularly on adjacent surface water bodies. In this context, it is ... [more ▼]

Quantification of pollutant mass fluxes is essential for assessing the impact of contaminated sites on their surrounding environment, particularly on adjacent surface water bodies. In this context, it is essential to quantify but also to be able to monitor the variations with time of Darcy fluxes in relation with changes in hydrogeological conditions and groundwater - surface water interactions. A new tracer technique is proposed that generalizes the single-well point dilution method to the case of finite volumes of tracer fluid and water flush. It is called the Finite Volume Point Dilution Method (FVPDM). It is based on an analytical solution derived from a mathematical model proposed recently to accurately model tracer injection into a well. Using a non-dimensional formulation of the analytical solution, a sensitivity analysis is performed on the concentration evolution in the injection well, according to tracer injection conditions and well-aquifer interactions. Based on this analysis, optimised field techniques and interpretation methods are proposed. The new tracer technique is easier to implement in the field than the classical point dilution method while it further allows monitoring temporal changes of the magnitude of estimated Darcy fluxes, which is not the case for the former technique. The new technique was applied to two experimental sites with contrasting objectives, geological and hydrogeological conditions, and field equipment facilities. In both cases, field tracer concentrations monitored in the injection wells were used to fit the calculated modelled concentrations by adjusting the apparent Darcy flux crossing the well screens. Modelling results are very satisfactory and indicate that the methodology is efficient and accurate, with a wide range of potential applications in different environments and experimental conditions, including the monitoring with time of changes in Darcy fluxes. [less ▲]

Detailed reference viewed: 190 (49 ULg)
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See detailA new training simulator for improved voltage control of the Hydro-Québec system
Van Cutsem, Thierry ULg; Hassé, Gaëtan; Moors, Cédric et al

(2004, October)

This paper reports on the development of a training simulator focusing on voltage control and stability. It has been derived from a quasi steady-state simulation software already used and validated in ... [more ▼]

This paper reports on the development of a training simulator focusing on voltage control and stability. It has been derived from a quasi steady-state simulation software already used and validated in planning and operational planning studies. The computational engine has been provided with a user interface built on the client-server architecture, allowing the simulator to run on a network of PCs in a very flexible way. New displays can be set up easily and quickly. This tool is presently used by Hydro-Québec to improve the operator’s ability to control transmission voltages. Other features, uses and benefits are reported. [less ▲]

Detailed reference viewed: 48 (7 ULg)
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See detailNew Transfer Functions for Correcting Turbulent Water Vapour Fluxes
De Ligne, Anne ULg; Heinesch, Bernard ULg; Aubinet, Marc ULg

in Boundary-Layer Meteorology (2010), 137(2), 205-221

We address the problem of the high-frequency correction of water vapour fluxes measured by eddy covariance with a closed-path infrared gas analyser (IRGA). Different transfer functions are compared and ... [more ▼]

We address the problem of the high-frequency correction of water vapour fluxes measured by eddy covariance with a closed-path infrared gas analyser (IRGA). Different transfer functions are compared and evaluated at a forested (Vielsalm, Belgium) and an agricultural (Lonz,e, Belgium) site. Classical functions, usually applied to correct CO2 fluxes (Gaussian, Lorentzian), are found to be unsuited to water vapour cospectral corrections, being characterised by too sharp a decrease at high frequency. Two other functions characterised by a lower decreasing slope are found to better fit experimental transfer functions. They were calibrated and validated on experimental transfer functions and their dependency on air humidity is parameterised. On this basis, new correction coefficients are estimated. The coefficients are found to be larger than those based on the classical functions, even when the dependency of the latter on air humidity is taken into account. The difference amounts to 10 at the forested site and to 5 larger at the crop site. The study highlights the necessity of characterising the water transfer function shape and taking it into account in the correction factor at each site equipped with a closed path IRGA. [less ▲]

Detailed reference viewed: 39 (14 ULg)