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Peer Reviewed
See detailClassification and patterns of development of children and teenagers with Down’s Syndrome
Frenkel, Stéphanie ULiege; Bourdin, Béatrice; Vandromme, Luc

Poster (2002)

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See detailClassification automatique d'images biologiques par variantes d'arbres de décision
Mathéi, Axel ULiege

Master's dissertation (2011)

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See detailClassification automatique d'images par arbres de d́ecision
Marée, Raphaël ULiege

Doctoral thesis (2005)

The work presented in this thesis is motivated by the problem of automatic image classification. Image classification methods seek to automatically classify previously unseen images using databases of ... [more ▼]

The work presented in this thesis is motivated by the problem of automatic image classification. Image classification methods seek to automatically classify previously unseen images using databases of labeled images provided by human experts. The main contribution of this thesis is a novel approach for image classification that has been shown to perform well on a variety of tasks. It uses some recent machine learning algorithms based on ensembles of decision trees that we applied directly on pixel values. We combine it with techniques of random extraction and transformation of subwindows from images so as to improve robustness to certain image transformations. The method has been evaluated on 7 publicly available datasets corresponding to various image classification tasks: recognition of handwritten digits, faces, 3D objects, textures, buildings, themes, or landscapes. Some of these datasets contain images representing widely varying conditions: occlusions, cluttered background, illumination, viewpoint, orientation, and scale changes. The accuracy of our method is generally comparable with the state of the art and it is particularly attractive in terms of computational efficiency. [less ▲]

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See detailClassification automatique de textes néo-égyptiens selon leur genre littéraire
Martin Leon, Benjamin ULiege

Master's dissertation (2010)

Detailed reference viewed: 61 (21 ULiège)
Peer Reviewed
See detailClassification criteria for neurogenic claudication caused by lumbar spinal stenosis
Genevay, Stéphane; Courvoisier, Delphine; Konstantinou, Kika et al

in 9th Interdisciplinary World Congress on Low Back And Pelvic Girdle Pain (2016, October)

BACKGROUND Classification criteria are recommended for diseases that lack highly specific biomarkers in order to improve homogeneity in clinical research. Since imaging evidence of lumbar spinal stenosis ... [more ▼]

BACKGROUND Classification criteria are recommended for diseases that lack highly specific biomarkers in order to improve homogeneity in clinical research. Since imaging evidence of lumbar spinal stenosis (LSS) or lumbar disc herniations (LDH) may not be associated with symptoms, clinical classification criteria based upon patient symptoms and physical examination findings are required. This study sought to develop a set of criteria identifying patients with neurogenic claudication (NC) caused by LSS and patient with radicular pain (RP) caused by LDH. This abstract reports the results concerning NC caused by LSS. METHODS Phase 1: Nineteen spine specialists (clinicians and researchers) from 8 countries participated in a Delphi process, using an internet program, to rank symptoms and signs which suggest LSS as the cause of NC or DH as the cause of RP. Phase 2: Nineteen different spine specialists (surgeons and non-surgeons) from 5 countries recruited patients during office visits and classify them with a high degree of confidence as having with either: 1) NC caused by LSS 2) RP caused by LDH or 3) non-specific low back pain (NSLBP) with non-specific leg pain radiation. Patients completed survey items and specialists documented examination signs. Signs and symptoms present in ≥ 10 patients were analyzed by using Generalized Estimating Equations (GEE). Patients with NC caused by LSS or NSLBP served as controls. Items with p<0.1 in univariate analysis were entered in the multivariate analysis. A score to predict NC caused by LSS was developed based on the coefficient of the GEE, and used to obtain a ROC curve and the associated area under the curve (AUC). RESULTS A list of 46 clinical signs and 28 patient-reported symptoms were selected by the group of spine specialists during the 1st phase. For the 2nd phase, 209 patients with high confidence in the diagnosis were included 63 NC caused by LSS, 89 RP caused by DH, and 57 NSLBP with non-specific leg pain radiation. Items which predicted NC with a p-value <0.1 included age >60, bilateral leg pain, leg pain relieved by sitting, leg pain decreased by leaning or flexing, positive30 seconds extension test, negative straight leg raise test. The score had an AUC of 0.91, and the cutoff to obtain a specificity of 92.1% resulted in a sensitivity of 80.0%. CONCLUSION An international collaboration of surgeon and non-surgeon spine specialists produced a set of diagnostic criteria with high specificity and sensitivity for identifying patients with NC caused by LSS. Using this set could improve the quality of basic science and clinical research in this field by improving homogeneity within groups of patients. [less ▲]

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See detailClassification Criteria for Neurogenic Claudication Caused by Lumbar Spinal Stenosis
Genevay, Stéphane; Courvoisier, Delphine; Konstantinou, Kika et al

in EuroSpine 2016 (2016, October)

BACKGROUND Classification criteria are recommended for diseases that lack highly specific biomarkers in order to improve homogeneity in clinical research. Since imaging evidence of lumbar spinal stenosis ... [more ▼]

BACKGROUND Classification criteria are recommended for diseases that lack highly specific biomarkers in order to improve homogeneity in clinical research. Since imaging evidence of lumbar spinal stenosis (LSS) or lumbar disc herniations (LDH) may not be associated with symptoms, clinical classification criteria based upon patient symptoms and physical examination findings are required. This study sought to develop a set of criteria identifying patients with neurogenic claudication (NC) caused by LSS and patient with radicular pain (RP) caused by LDH. This abstract reports the results concerning NC caused by LSS. METHODS Phase 1: Nineteen spine specialists (clinicians and researchers) from 8 countries participated in a Delphi process, using an internet program, to rank symptoms and signs which suggest LSS as the cause of NC or DH as the cause of RP. Phase 2: Nineteen different spine specialists (surgeons and non-surgeons) from 5 countries recruited patients during office visits and classify them with a high degree of confidence as having with either: 1) NC caused by LSS 2) RP caused by LDH or 3) non-specific low back pain (NSLBP) with non-specific leg pain radiation. Patients completed survey items and specialists documented examination signs. Signs and symptoms present in ≥ 10 patients were analyzed by using Generalized Estimating Equations (GEE). Patients with NC caused by LSS or NSLBP served as controls. Items with p<0.1 in univariate analysis were entered in the multivariate analysis. A score to predict NC caused by LSS was developed based on the coefficient of the GEE, and used to obtain a ROC curve and the associated area under the curve (AUC). RESULTS A list of 46 clinical signs and 28 patient-reported symptoms were selected by the group of spine specialists during the 1st phase. For the 2nd phase, 209 patients with high confidence in the diagnosis were included 63 NC caused by LSS, 89 RP caused by DH, and 57 NSLBP with non-specific leg pain radiation. Items which predicted NC with a p-value <0.1 included age >60, bilateral leg pain, leg pain relieved by sitting, leg pain decreased by leaning or flexing, positive30 seconds extension test, negative straight leg raise test. The score had an AUC of 0.91, and the cutoff to obtain a specificity of 92.1% resulted in a sensitivity of 80.0%. CONCLUSION An international collaboration of surgeon and non-surgeon spine specialists produced a set of diagnostic criteria with high specificity and sensitivity for identifying patients with NC caused by LSS. Using this set could improve the quality of basic science and clinical research in this field by improving homogeneity within groups of patients. [less ▲]

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See detailClassification des céramiques selon la nature chimique et le procédé de mise en oeuvre
Moureau, Thomas ULiege; Bouhy, Alice ULiege; Raepsaet, Nicolas ULiege et al

in Revue Belge de Médecine Dentaire = Belgisch Tijdschrift voor Tandheelkunde (2006), 61(1), 17-29

Nowadays, we find on the market a huge amount of design and manufactured system that allows the realisation of all-ceramics restorations, using different ceramics. The purpose of this article is ... [more ▼]

Nowadays, we find on the market a huge amount of design and manufactured system that allows the realisation of all-ceramics restorations, using different ceramics. The purpose of this article is suggesting a classification of mostly used ceramics and a few laboratory process used in our university. [less ▲]

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See detailClassification des rongeurs
Mignon, Jacques ULiege; Hardouin, Jacques

in Bulletin BEDIM (2003), 12(1), 12-13

The note aims at providing the main characteristics of the principal families of rodents relevant to minilivestock.

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See detailClassification diagnostique 0-3 ans : Recherche sémiologique sur les troubles de la régulation
Scholl, Jean-Marc ULiege

in Psychiatrie de l'Enfant (La) (2007), L(1), 179-203

In the Diagnostic Classification Zero to Three, Regulation Disorders of Sensory Processing refer to children’s difficulties in regulating emotions, behaviours and motor skills in response to sensory ... [more ▼]

In the Diagnostic Classification Zero to Three, Regulation Disorders of Sensory Processing refer to children’s difficulties in regulating emotions, behaviours and motor skills in response to sensory stimulation. This article presents a research program that aims to specify more accurately the semiology of micro-signs – identifiable¬ in the clinical symptoms and in anamnesis – of¬ Regulation Disorders. We give here the results of a preliminary stage of research, which consists of a qualitative microanalysis of 90 Regulation Disorder cases in children between 7 months and 5 years old. We give particular attention to visual-spatial processing, auditory-verbal processing, the perception of the affects, the modalities of their expression, the “energy level” of the child, the organisation of the buccal sphere, the hyper- or hyposensitivity of each sensory channel, and all symptoms having a connection to some constitutional platform. This preliminary stage serves as the basis of a questionnaire which is at heart of the second step of the research. We will further clarify the specific signs of Regulation Disorders and their frequency, comparing the results of this anamnestic questionnaire using a control sample and a sample of children with Regulation Disorders. This study aims to contribute to a more accurate description of the clinical pictures of these children and to enrich multidisciplinary exchanges and psychotherapeutic practices. [less ▲]

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See detailCLASSIFICATION DIAGNOSTIQUE 0-3 ANS RÉVISÉE : UNE NOUVELLE PRÉSENTATION DES TROUBLES DE LA RÉGULATION DU TRAITEMENT DES STIMULI SENSORIELS
Scholl, Jean-Marc ULiege

in Devenir (2007), 19(2), 109-130

In 1994 was published the first « Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood », and in August 2005 the Revised Edition » (DC:0-3R). This article ... [more ▼]

In 1994 was published the first « Diagnostic Classification of Mental Health and Developmental Disorders of Infancy and Early Childhood », and in August 2005 the Revised Edition » (DC:0-3R). This article presents the revised criteria of the diagnosis: Regulation Disorders of Sensory Processing. This innovative diagnosis includes three types: Hypersensitive, Hyposensitive/Underresponsive and Sensory Stimulation-Seeking/Impulsive. These children have difficulty processing sensory input (touch, sight, sound, taste, smelt, sensation of movement) and regulating their responses. This diagnosis refers to children’s difficulties in regulating emotions, behaviours and motor abilities in response to sensory stimulation. [less ▲]

Detailed reference viewed: 412 (7 ULiège)
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See detailClassification efficiency of the trimmed k-means procedure
Ruwet, Christel ULiege

Conference (2012, May 21)

The k-means method is used in classification to group similar observations in k groups. When a second sample is available to test the obtained groupings, the rate of misclassification can be computed. If ... [more ▼]

The k-means method is used in classification to group similar observations in k groups. When a second sample is available to test the obtained groupings, the rate of misclassification can be computed. If the samples are generated from a mixture of two homoscedastic and spherically symmetric distributions, the rate of misclassification equals that of the Bayes rule. Therefore, the k-means method is optimal under such a mixture model. However, it is not robust with respect to outliers in the dataset used to construct the groups. To avoid this problem, the k-means procedure has been adapted in many ways. This presentation focuses on the trimmed k-means method defined by trimming some of the observations. The advantage of this method, besides its resistance to outliers, is that optimality is preserved. However, it is well known that trimming observations leads to a loss in classification efficiency. The latter can be measured by means of the influence function of the misclassifiation rate. [less ▲]

Detailed reference viewed: 27 (6 ULiège)
See detailClassification et partitionnement de textes : l'approche topologique
Longrée, Dominique ULiege

Scientific conference (2011)

Detailed reference viewed: 7 (0 ULiège)
See detailClassification et partitionnement de textes : l'approche topologique
Longrée, Dominique ULiege

Scientific conference (2010)

Detailed reference viewed: 26 (0 ULiège)
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See detailClassification et régimes dans les prisons belges
Devresse, Marie-Sophie; Robert, Luc; Vanneste, Charlotte ULiege

in Revue de droit pénal et de criminologie (2014)

Detailed reference viewed: 89 (20 ULiège)
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See detailLa classification fonctionnelle des dysfonctions de la valvule mitrale selon Carpentier
RADERMECKER, Marc ULiege; Limet, Raymond ULiege

in Revue Médicale de Liège (1995), 50(7), 292-4

Pour aborder le traitement chirurgical de la valvule mitrale autrement, c'est-à-dire par une réparation valvulaire comme alternative raisonnable au remplacement sytématique, il faut recourir à une ... [more ▼]

Pour aborder le traitement chirurgical de la valvule mitrale autrement, c'est-à-dire par une réparation valvulaire comme alternative raisonnable au remplacement sytématique, il faut recourir à une classfication fonctionnelle des dysfonctions mitrales. Cette classification, établie par Carpentier (1, 2) regroupe les dysfonctions valvulaire mitrales en trois rubriques : a) le type caractérisé par des mouvements valvulaires normaux, b) le type 2, équivalent au prolapsus valvulaire, c) le type 3, correspondant à la restriction des mouvements valvulaires. Cette approche nouvelle postule, en outre, qu'une affection valvulaire n'est parfaitement définie que lorsqu'on en connaît l'étiologie, les lésions et les dysfonctions. L'utilisation de cette méthode analytique (qui a l'avantage de la simplicité et de la clarté) permet au chirurgien de réparer la valvule mitrale en adaptant à chaque dysfonction une correction appropriée et, par l'application de règles, d'obtenir des résultats reproductibles (3-6). [less ▲]

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See detailClassification Games in European Law & Science
Hendrickx, Kim ULiege

Scientific conference (2011, November 16)

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See detailClassification géométrique des espaces commerçants wallons - Vers une objectivation des caractéristiques morphologiques des nodules ?
Vazquez Parras, Juan ULiege

in Bulletin de la Société Géographique de Liège (2011), 56(Numéro thématique),

This study develops a method classifying retail spaces through geometry. It attempts to objectify quantitatively several criterions (usually based on empirical observation) which define retail supply. The ... [more ▼]

This study develops a method classifying retail spaces through geometry. It attempts to objectify quantitatively several criterions (usually based on empirical observation) which define retail supply. The method developed shows that it is possible to characterize different commercial forms by using relatively simple indicators. In order to apply this method, this study drawn upon a database of 20,000 stores geolocalised and gathered by shopping areas all over Wallonia. This paper is divided into three main points: the construction of indicators, their compilation and the identification of a classification of retail spaces. [less ▲]

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See detailA classification indices-based model for net primary productivity (NPP) and potential productivity of vegetation in China
Lin, Huilong; Zhao, Jun; Liang, Tiangang et al

in International Journal of Biomathematics (2012), 5

Detailed reference viewed: 81 (4 ULiège)