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See detailExtremely randomized trees
Geurts, Pierre ULg; Ernst, Damien ULg; Wehenkel, Louis ULg

in Machine Learning (2006), 63(1), 3-42

This paper proposes anew tree-based ensemble method for supervised classification and regression problems. It essentially consists of randomizing strongly both attribute and cut-point choice while ... [more ▼]

This paper proposes anew tree-based ensemble method for supervised classification and regression problems. It essentially consists of randomizing strongly both attribute and cut-point choice while splitting a tree node. In the extreme case, it builds totally randomized trees whose structures are independent of the output values of the learning sample. The strength of the randomization can be tuned to problem specifics by the appropriate choice of a parameter. We evaluate the robustness of the default choice of this parameter, and we also provide insight on how to adjust it in particular situations. Besides accuracy, the main strength of the resulting algorithm is computational efficiency. A bias/variance analysis of the Extra-Trees algorithm is also provided as well as a geometrical and a kernel characterization of the models induced. [less ▲]

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See detailExtremely Randomized Trees and Random Subwindows for Image Classification, Annotation, and Retrieval
Marée, Raphaël ULg; Wehenkel, Louis ULg; Geurts, Pierre ULg

in Criminisi, A; Shotton, J (Eds.) Decision Forests in Computer Vision and Medical Image Analysis, Advances in Computer Vision and Pattern Recognition (2013)

We present a unified framework involving the extraction of random subwindows within images and the induction of ensembles of extremely randomized trees. We discuss the specialization of this framework for ... [more ▼]

We present a unified framework involving the extraction of random subwindows within images and the induction of ensembles of extremely randomized trees. We discuss the specialization of this framework for solving several general problems in computer vision, ranging from image classification and segmentation to content-based image retrieval and interest point detection. The methods are illustrated on various applications and datasets from the biomedical domain [less ▲]

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See detailExtremely Unstable Evaporative Bénard-Marangoni Systems: the Role of Transients in the Gas
Rednikov, Alexey; Machrafi, Hatim ULg; Dauby, Pierre ULg et al

in Book of Conference Abstracts of the International Marangoni Association, 6 (2012)

Detailed reference viewed: 17 (1 ULg)
See detailThe extremist persuasion
Jamin, Jérôme ULg

Scientific conference (2008)

Detailed reference viewed: 3 (0 ULg)
See detailExtremophiles
Berlemont, Renaud ULg; Gerday, Charles ULg

in Comprehensive Biotechnology (2010)

Extremophiles are organisms which inhabit environments characterized by properties harsh enough to hinder the survival of common cells. They are highly diversified and are classified on the basis of the ... [more ▼]

Extremophiles are organisms which inhabit environments characterized by properties harsh enough to hinder the survival of common cells. They are highly diversified and are classified on the basis of the main extreme property that prevails in the habitat. Six main categories can be distinguished: the thermophiles found in high temperature sites and which can tolerate temperatures sometimes close to that of the boiling point of water; the psychrophiles living in permanently cold habitats with temperatures sometimes well below the freezing point of water; the piezophiles, which tolerate pressure as high as 1000 atm; the halophiles supporting salt concentrations, in some cases, higher than 300gl–1; the acidophiles thriving well at pH sometimes close to zero; and the alkaliphiles, which, on the contrary, tolerate pH largely exceeding neutrality. These organisms are mainly microorganisms and they notably produce enzymes that are adapted to work in unusual conditions often required in biotechnological processes. This confers upon these organisms a very high potential. They are the target of a steadily increasing interest and are nowadays largely used in various industrial applications. [less ▲]

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See detailExtremophiles, early Earth biosphere and exobiology
Javaux, Emmanuelle ULg; Marshall, C.

Poster (2004)

Detailed reference viewed: 23 (1 ULg)
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See detailExtrusion foaming of poly(styrene-co-acrylonitrile)/ clay nanocomposites using supercritical CO2
Urbanczyk, Laetitia; Alexandre, Michaël ULg; Detrembleur, Christophe ULg et al

in Macromolecular Materials and Engineering (2010), 295(10), 915-

Supercritical CO2 has been used as a blowing agent to foam poly(styrene-co-acrylonitrile)-based materials in a single screw extruder specially adapted to allow fluid injection. The cellular morphology ... [more ▼]

Supercritical CO2 has been used as a blowing agent to foam poly(styrene-co-acrylonitrile)-based materials in a single screw extruder specially adapted to allow fluid injection. The cellular morphology depends on foaming temperature, more regular cells being obtained with decreasing extrusion temperature. In a second step, a natural and an organomodified nanoclay have been added for the purpose of imparting some flame resistance to the foamed material. The filler efficiency in reducing sample combustion rate appeared to be dependent on its delamination level inside the matrix and better results were obtained when the organomodified clay was first delaminated in the polymer in an efficient twin screw extruder using water assistance, prior to foaming in the single screw extruder. [less ▲]

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See detailExtrusion tests of 7075 aluminium alloy at high solid fraction
Vaneetveld, Grégory ULg; Rassili, Ahmed ULg; Pierret, Jean-Christophe ULg et al

in International Journal of Material Forming (2008), 1(1), 1019-1022

Thixoforging is a type of semi-solid metal processing at high solid fraction (0.5<fs<1). 7075 aluminium alloy has been used as a feedstock for thixoforging in order to investigate thixoformability of a ... [more ▼]

Thixoforging is a type of semi-solid metal processing at high solid fraction (0.5<fs<1). 7075 aluminium alloy has been used as a feedstock for thixoforging in order to investigate thixoformability of a high performance aluminium alloy at high solid fraction. Higher solid fraction of 7075 alloy is less sensitive to a drop in temperature, avoids metal splash at high speed, allows laminar flow at high speed. Hot tool is used to slow down the solidification rate of the high solid fraction metal by decreasing thermal exchanges. To determine the best parameters to achieve maximum mechanical properties in thixoforging of 7075 aluminum alloy, we need to consider the impact of some parameters such as tool temperature, shear rate. For this, we use extrusion tests with constant speed [1] where these parameters are known. The result of this study is that each parameter has its level of impact on the thixoforging: the temperature of the tool and the deformation rate shouldn't be high to avoid cracks. Thermal exchanges between the material flow and the tool have to be reduced to avoid high solidification rate [2]. [less ▲]

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See detailExuberant inflammatory reaction after an infiltration of platelet-rich plasma (PRP)
Kaux, Jean-François ULg; Croisier, Jean-Louis ULg; LEONARD, Philippe ULg et al

in British Journal of Sports Medicine (2013, June), 47(10 (e3)), 92

Background: PRP, obtained from centrifuged autologous blood, contains a large quantity of growth factors, which may enhance the tissue healing processes. Local infiltration of PRP represents a relatively ... [more ▼]

Background: PRP, obtained from centrifuged autologous blood, contains a large quantity of growth factors, which may enhance the tissue healing processes. Local infiltration of PRP represents a relatively new treatment for tendinopathies. To date, no side effects have been reported after infiltration of PRP to treat tendinopathy. Case report: A 35-year-old patient had a right upper patellar tendinopathy which was resistant to all conservative treatments for more than 6 months. The patient was a type 1 diabetic (well controlled). He had an intratendinous infiltration of 6 mL of PRP (8.105 platelets/mm3, almost no red or white blood cells) after disinfection but without local anaesthetic. Immediately following the infiltration, local cryotherapy was performed for 15 minutes. NSAIDs were avoided, but class-1 or -2 pain-killers were authorised if necessary. A standardised sub-maximal eccentric rehabilitation should have been started 1 week after. However, the patient experienced local swelling with erythema, increased heating and pain which appeared just underneath the patella, but without biological inflammatory syndrome. A great Doppler signal in a thicker patellar tendon was observed by US, but there was no sign of local infectious disease demonstrated by either CT or MRI. However, the local inflammation did not decrease after a progressive 3-week treatment of local cryotherapy, local and oral NSAIDs and colchicine 1 mg. Thus, an insidious infection was suspected, even though there was neither evidence of biological inflammatory syndrome nor sign of infectious lesion on imagery examination. An antibiotic therapy (rifampicine 600 mg + minocycline 100 mg) was initiated for 3 months. Finally, a 3-phase bone scintigraphy suggested the presence of a complex regional pain syndrome type 1 treated by a classical physical therapy and concomitant class-2 pain killers. The evolution was favourable after 6 months of symptomatic treatment, and the pain decreased to a level similar to that before the infiltration of PRP. Discussion/Conclusions: This case report draws attention to potential side effects that are linked to this new therapy by infiltration of platelet rich plasma in case of tendinopathy, in particular when used in patients with type 1 diabetes. Thus, the balance between benefits and risks must be carefully evaluated before using this treatment in patients with type 1 diabetes. Reference: Platelet-rich plasma application in the management of chronic tendinopathies. Acta Orthop Belg 2013; 79: 10-15. [less ▲]

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See detailExuberant inflammatory reaction after an infiltration of platelet-rich plasma to treat tendinopathy
Kaux, Jean-François ULg; Croisier, Jean-Louis ULg; LEONARD, Philippe ULg et al

in Book of abstracts of 18th Annual Congress of the ECSS (2013, June)

Background: PRP, obtained from centrifuged autologous blood, contains a large quantity of growth factors, which may enhance the tissue healing processes. Local infiltration of PRP represents a relatively ... [more ▼]

Background: PRP, obtained from centrifuged autologous blood, contains a large quantity of growth factors, which may enhance the tissue healing processes. Local infiltration of PRP represents a relatively new treatment for tendinopathies. To date, no side effects have been reported after infiltration of PRP to treat tendinopathy. Case report: A 35-year-old patient had a right upper patellar tendinopathy which was resistant to all conservative treatments for more than 6 months. The patient was a type 1 diabetic (well controlled). He had an intratendinous infiltration of 6 mL of PRP (8.105 platelets/mm3, almost no red or white blood cells) after disinfection but without local anaesthetic. Immediately following the infiltration, local cryotherapy was performed for 15 minutes. NSAIDs were avoided, but class-1 or -2 pain-killers were authorised if necessary. A standardised sub-maximal eccentric rehabilitation should have been started 1 week after. However, the patient experienced local swelling with erythema, increased heating and pain which appeared just underneath the patella, but without biological inflammatory syndrome. A great Doppler signal in a thicker patellar tendon was observed by US, but there was no sign of local infectious disease demonstrated by either CT or MRI. However, the local inflammation did not decrease after a progressive 3-week treatment of local cryotherapy, local and oral NSAIDs and colchicine 1 mg. Thus, an insidious infection was suspected, even though there was neither evidence of biological inflammatory syndrome nor sign of infectious lesion on imagery examination. An antibiotic therapy (rifampicine 600 mg + minocycline 100 mg) was initiated for 3 months. Finally, a 3-phase bone scintigraphy suggested the presence of a complex regional pain syndrome type 1 treated by a classical physical therapy and concomitant class-2 pain killers. The evolution was favourable after 6 months of symptomatic treatment, and the pain decreased to a level similar to that before the infiltration of PRP. Discussion/Conclusions: This case report draws attention to potential side effects that are linked to this new therapy by infiltration of platelet rich plasma in case of tendinopathy, in particular when used in patients with type 1 diabetes. Thus, the balance between benefits and risks must be carefully evaluated before using this treatment in patients with type 1 diabetes. Reference: Platelet-rich plasma application in the management of chronic tendinopathies. Acta Orthop Belg 2013; 79: 10-15. [less ▲]

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See detailExuberant inflammatory reaction as a side effect of platelet-rich plasma infiltration for treating one case of tendinopathy
Kaux, Jean-François ULg; Croisier, Jean-Louis ULg; LEONARD, Philippe ULg et al

in Clinical Journal of Sport Medicine (2014), 24(2), 150-152

Platelet-rich plasma (PRP) contains a large quantity of growth factors, which may enhance tendon healing processes. Local infiltration of PRP represents a relatively new treatment for tendinopathies. To ... [more ▼]

Platelet-rich plasma (PRP) contains a large quantity of growth factors, which may enhance tendon healing processes. Local infiltration of PRP represents a relatively new treatment for tendinopathies. To date, no side effects have been reported after infiltration of PRP to treat tendinopathy. We reported a case of exuberant inflammatory reaction after one infiltration of PRP to treat jumper’s knee in a type 1 diabetic patient who was 35 years old. Injections of PRP must be proposed after careful consideration for patients with morbidity risks linked to insulin-dependent diabetes. [less ▲]

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See detailExurbanisation ou réintégration urbaine des industries et du tertiaire lourd? Comparaison et perspectives
Merenne-Schoumaker, Bernadette ULg

in Bulletin de la Société Géographique de Liège (1983), (19), 53-61

The aim of this study is, initially, to compare the attempts at urban reintegration of certain industrial activities at the present time with the considerable ex-urbanisation movement of activities which ... [more ▼]

The aim of this study is, initially, to compare the attempts at urban reintegration of certain industrial activities at the present time with the considerable ex-urbanisation movement of activities which has been evident since 1960. We then go on to analyse the strenghts and weaknesses of the two trends and seek to define the likely future of the processes and put forward a new urban strategy for a more efficient policy as to receiving certain activities in urban surroundings. [less ▲]

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See detailThe Eye of the Storm: Janet Frame
Delrez, Marc ULg

Conference (1996)

Detailed reference viewed: 5 (0 ULg)
See detailThe Eye of the Storm: Vision and Survival in A State of Siege
Delrez, Marc ULg

in Delbaere, Jeanne (Ed.) The Ring of Fire: Essays on Janet Frame (1992)

Detailed reference viewed: 23 (2 ULg)
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See detailThe eyelids and metastatic breast carcinoma.
Claessens, Nadine; Pierard, Gérald ULg

in Dermatology : International Journal for Clinical & Investigative Dermatology (2003), 206(2), 181-2

Detailed reference viewed: 5 (1 ULg)
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See detailEyes open, brain shut
Laureys, Steven ULg

in Scientific American (2007), 296(5), 84-89

Recent progress in medical care has greatly increased the number of people who survive acute brain damage. Doctors can save the lives of many patients who suffer trauma to the brain or a lack of oxygen ... [more ▼]

Recent progress in medical care has greatly increased the number of people who survive acute brain damage. Doctors can save the lives of many patients who suffer trauma to the brain or a lack of oxygen, but if the damage is severe, the victim will-slip into a coma, individuals in this condition do not open their eyes; at best, they will show some reflex movements to the limbs. [less ▲]

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See detailAn eYFP Reporter Gene for the Yeast Two-hybrid System
Damon, Coralie; Boxus, Mathieu; Twizere, Jean-Claude ULg et al

in Protein Journal (2013), 32(2), 126-130

Detailed reference viewed: 16 (2 ULg)