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See detailLa corrélation canonique : principes et application
Palm, Rodolphe ULg

in Notes de Statistique et d'Informatique (1990), (1), 28

This note describes the different stages in interpreting a canonical correlation analysis. It is based on an example analysed by SAS software. Relationship with some other multivariate statistical methods ... [more ▼]

This note describes the different stages in interpreting a canonical correlation analysis. It is based on an example analysed by SAS software. Relationship with some other multivariate statistical methods is also pointed out. [less ▲]

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See detailCorrélation de la densité minérale osseuse de l’os spongieux du fémur et du T2* chez l’enfant
Schwartz, Cédric ULg

Master of advanced studies dissertation (2005)

La maladie de Legg-Calvé-Perthes est une maladie infantile qui a pour origine une ischémie du noyau épiphysaire fémoral supérieur. Cette pathologie évolue naturellement vers la guérison mais souvent avec ... [more ▼]

La maladie de Legg-Calvé-Perthes est une maladie infantile qui a pour origine une ischémie du noyau épiphysaire fémoral supérieur. Cette pathologie évolue naturellement vers la guérison mais souvent avec des déformations irréversibles de la tête fémorale. Le travail du médecin est de limiter au maximum ces complications. L’équipe d’imagerie vasculaire et biomécanique de l’UMR CNRS 6600 à l’Université de Technologie de Compiègne souhaite créer un modèle biomécanique de la hanche de l’enfant afin de proposer au médecin un outil de pronostic de l’évolution de la maladie et ainsi l’aider dans son choix de traitement. La création d’un modèle biomécanique implique la connaissance de la géométrie de la tête fémorale et des propriétés mécaniques des tissus qui la composent, c’est- à - dire de l’os cortical, de l’os spongieux et du cartilage. L’objet de cette étude est d’obtenir la densité minérale osseuse (DMO) de l’os spongieux à partir de la mesure du temps de relaxation transverse apparent T2*. L’interface de deux matériaux de susceptibilité magnétique différente (l’os et la moelle) crée des inhomogénéités dans le champ magnétique ayant pour conséquence un déphasage plus rapide des protons et donc un temps de relaxation plus petit. L’idée de ce travail est de proposer une méthode permettant de corréler la DMO au T2* au niveau de la hanche de l’enfant. Nous avons développé un modèle permettant de simuler en 2D et en 3D l’influence de différentes structures sur le T2*. Ces simulations nous ont conduit à appréhender les différents paramètres influant sur la valeur du T2* (l’orientation des travées, la différences de susceptibilité magnétique, ...). Ce travail nous a permis de mettre en avant l’importance qu’il y avait à prendre en compte la présence de deux types de moelle (jaune et rouge) dans la tête fémorale de l’enfant et l’orientation des travées. La corrélation en elle-même pourra être réalisée à l’aide d’un fantôme composé de cylindres de diamètre proche de l’épaisseur des travées osseuses. [less ▲]

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See detailCorrélation entre l'augmentation de la densité minérale osseuse et la réduction du risque fracturaire lors d'un traitement par ranélate de strontium
Bruyère, Olivier ULg; Cormier, C.; Fardellone, Patrice et al

in Revue du Rhumatisme (2006, December), 73

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See detailCorrelation entre l'echelle de Liege et un marqueur biochimique de la lesion cerebrale.
Born, J. D.; Hans, Pol ULg; Chapelle, Jean-Paul ULg et al

in Neuro-Chirurgie (1984), 30(5), 319-23

Brain type creatine kinase isoenzyme (CK.-1) was measured in the ventricular cerebrospinal fluid in a series of 42 patients within 7 +/- 3,4 hours following severe head injury (GCS less than or equal to 7 ... [more ▼]

Brain type creatine kinase isoenzyme (CK.-1) was measured in the ventricular cerebrospinal fluid in a series of 42 patients within 7 +/- 3,4 hours following severe head injury (GCS less than or equal to 7, LCS less than or equal to 12). The presence of the CK.-1 isoenzyme correlated with the degree of head injury as indexed by the Glasgow coma scale and the Liege coma scale. There was a significant logarithmic correlation between CK.-1 activity in the C.S.F. and the coma scores. However, the correlation with the Liege coma scale score (r = -0,84) is significantly better (Z = 1,97; p less than 0,05) than with the Glasgow coma scale score (r = -0,65). Thus, the Liege coma scale is a better index of neurological trauma. [less ▲]

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See detailCorrelation law for SMD in high viscous liquids
Vetrano, Maria-Rosaria; Lebeau, Frédéric ULg; Rambaud, Patrick et al

Conference (2008, September)

Spray characterization, i. e. a velocity map of the liquid and gaseous phases and the sizing of the liquid droplet, remains of a great importance in different industrial applications such as in the ... [more ▼]

Spray characterization, i. e. a velocity map of the liquid and gaseous phases and the sizing of the liquid droplet, remains of a great importance in different industrial applications such as in the automotive or pharmaceutical industries. Correlations capable to faster this characterization already exist. They allow the evaluation of the droplet Sauter Mean Diameter in a precise location of the spray using non-dimensional numbers involving physical and chemical properties of the liquid and the spray operative conditions. This paper concerns the possibility to include in the correlative laws also the effect of the liquid viscosity through the introduction of the Ohnesorge number (Oh). In order to achieve this goal an extensively experimentalcampaign is performed, by means of a Phase Doppler Interferometer, for size and velocity measurements in a full cone spray. Parameters as the hydraulic diameter of the nozzle, the operatingpressure and the liquid viscosity are varied in order to cover large range of Weber and Ohnesorge numbers. [less ▲]

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See detailCorrelation measure to detect time series distances, whence economy globalization
Miskiewicz, J.; Ausloos, Marcel ULg

in Physica A: Statistical Mechanics and its Applications (2008), 387(26), 6584-6594

An instantaneous time series distance is defined through the equal time correlation coefficient. The idea is applied to the Gross Domestic Product (GDP) yearly increments of 21 rich countries between 1950 ... [more ▼]

An instantaneous time series distance is defined through the equal time correlation coefficient. The idea is applied to the Gross Domestic Product (GDP) yearly increments of 21 rich countries between 1950 and 2005 in order to test the process of economic globalisation. Some data discussion is first presented to decide what (EKS, GK, or derived) GDP series should be studied. Distances are then calculated from the correlation coefficient values between pairs of series. The role of time averaging of the distances over finite size windows is discussed. Three network structures are next constructed based on the hierarchy of distances. It is shown that the mean distance between the most developed countries on several networks actually decreases in time, -which we consider as a proof of globalization. An empirical law is found for the evolution after 1990 similar to that found, in flux creep. The optimal observation time window size is found similar or equal to 15 years. (c) 2008 Elsevier B.V. All rights reserved. [less ▲]

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See detailCorrelation of Experimental and Numerical Results on Electrostatically Actuated Micro-Beams
Rochus, Véronique ULg; Rixen, Daniel; Golinval, Jean-Claude ULg

in Technical Proceedings of the 2006 NSTI Nanotechnology Conference and Trade Show (2006), 3

The aim of this paper is to validate numerical simula- tions of electromechanical coupling in micro-structures using some experimental results. The micro-structures studied here consist in a micro-bridge ... [more ▼]

The aim of this paper is to validate numerical simula- tions of electromechanical coupling in micro-structures using some experimental results. The micro-structures studied here consist in a micro-bridge and two cantilever micro-beams. Multi-physics models of micro-electro- mechanical systems (MEMS) based on the ¯nite ele- ment method (FEM) are used to model the strongly coupled electro-mechanical interactions and to perform static analyses taking into account large displacements. In all the cases treated here the numerical results are in very good agreement with the experimental results. [less ▲]

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See detailCorrelation of five radioimmunoassay systems for measurement of bovine plasma pregnancy-associated glycoprotein concentrations at early pregnancy period.
Ayad, A.; Melo de Sousa, Noelita ULg; Sulon, Joseph ULg et al

in Research in Veterinary Science (2009), 86

The measurement of serum or plasma PAG concentrations is currently used as a specific method for pregnancy diagnosis in cattle. In this study, the correlation between five radioimmunoassay systems (RIA ... [more ▼]

The measurement of serum or plasma PAG concentrations is currently used as a specific method for pregnancy diagnosis in cattle. In this study, the correlation between five radioimmunoassay systems (RIA-497, RIA-706, RIA-780, RIA-809 and RIA-Pool) developed for measurement of PAG concentrations in ruminant species was investigated in plasma from pregnant Friesian Holstein females. Plasma PAG concentrations (ng/mL) measured by different RIA systems were significantly correlated between them ( 0.81; P<0.001). PAG concentrations increased significantly from Day 21 (n=27) to 30 (n=37) after AI by use of all PAG-RIA systems. From Day 30 to 80 after AI, lower PAG concentrations were observed when using the homologous system RIA-497. The addition of several proteinase inhibitors changed neither the non specific binding nor the B(0) binding to the tracer. Our results suggest that all tested PAG-RIA (RIA-497, RIA-706, RIA-780, RIA-809 and RIA-Pool) are highly correlated and can be useful to follow PAG concentrations in samples collected during the first trimester of gestation. [less ▲]

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See detailCorrelation of palpated pulse and invasive arterial blood pressure in dogs.
Gommeren, Kris ULg; Peyron, Clémence ULg; Lacoste-Garanger, Nicolas ULg et al

in Proceedings of the 9th EVECCS Annual meeting (2010)

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See detailCorrelation of phasic muscle strength and corticomotoneuron conduction time in multiple sclerosis.
van der Kamp, W.; MAERTENS DE NOORDHOUT, Alain ULg; Thompson, P. D. et al

in Annals of Neurology (1991), 29(1), 6-12

Central motor conduction times for the adductor pollicis muscle, the twitch force of that muscle to scalp magnetic motor cortex stimulation, and the maximum force of phasic voluntary contraction of the ... [more ▼]

Central motor conduction times for the adductor pollicis muscle, the twitch force of that muscle to scalp magnetic motor cortex stimulation, and the maximum force of phasic voluntary contraction of the same muscle were measured in 15 patients with multiple sclerosis. Two tests of manual dexterity of the same hand also were studied: the Purdue pegboard test, and the maximal frequency of a scissors movement of the thumb and index finger. The patients had normal strength or minimal weakness of the intrinsic muscles of the hand on clinical examination. The mean central motor conduction times for the adductor pollicis muscle for the patients were longer than normal, the peak twitch force of the adductor pollicis muscle evoked by cortical stimulation and the maximum force of a phasic voluntary contraction of the adductor pollicis muscle were smaller than normal. There were strong correlations between all these measures. Central motor conduction time in the patients was inversely correlated with voluntary phasic force and the twitch force after cortical stimulation. That is, the longer the central motor conduction time, the weaker the force. Prolonged central motor conduction time is likely to be accompanied by conduction block in corticomotoneuron pathways. The correlation of central motor conduction time with voluntary phasic force and the twitch force most likely reflects the degree of conduction block and temporal dispersion rather than delay in conduction per se. These results indicate that objective assessments of phasic muscle strength may reveal correlations with central motor conduction time that are not evident on conventional clinical examination which assesses tonic muscle contraction strength.(ABSTRACT TRUNCATED AT 250 WORDS) [less ▲]

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See detailCorrelation of postmortem 9.4 tesla magnetic resonance imaging and immunohistopathology of the human thoracic spinal cord 7 months after traumatic cervical spine injury.
Scholtes, Félix ULg; Adriaensens, Peter; Storme, Liesbet et al

in Neurosurgery (2006), 59(3), 671-8671-8

OBJECTIVE: To correlate high-resolution magnetic resonance imaging (MRI) with immunohistopathology in the injured human spinal cord. METHODS: Postmortem MRI scans at a field strength of 9.4 T, as well as ... [more ▼]

OBJECTIVE: To correlate high-resolution magnetic resonance imaging (MRI) with immunohistopathology in the injured human spinal cord. METHODS: Postmortem MRI scans at a field strength of 9.4 T, as well as standard histology and immunohistochemistry, were performed on an excised specimen of human high thoracic spinal cord, obtained 7 months after the initial trauma, several segments below a severe spinal cord lesion (C5). RESULTS: A precise correlation is described between MRI and immunohistochemistry of the long white matter tracts undergoing Wallerian degeneration and of an extension of the cervical lesion into the high thoracic cord. CONCLUSION: MRI, the only imaging technique that currently provides useful information on the spinal cord parenchyma after trauma, is rapidly evolving. High-field scanners of up to 9.4 T are being clinically tested. The present postmortem investigation of an isolated spinal cord specimen demonstrates the precise correlation that can be achieved between imaging and pathology. In future investigations, this type of technique can lead to a more precise description of spinal cord injuries and their consequences in remote tissue. Translation into the clinical setting will improve diagnosis and follow-up of spinal cord injured patients. [less ▲]

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See detailCorrelation of serum trace elements with other biological parameters in hemoproliferative disorders
Beguin, Yves ULg; Delbrouck, J.-M.; Robaye, G. et al

in Trace element analytical chemistry in medicine and biology (1987), 4

Serum trace elements were measured by PIXE in 88 patients with hemoproliferative disorders (Lymphoma, Hodgkin's disease, chronic lymphocytic leukemi, multiple myeloma, polycythemia vera and ... [more ▼]

Serum trace elements were measured by PIXE in 88 patients with hemoproliferative disorders (Lymphoma, Hodgkin's disease, chronic lymphocytic leukemi, multiple myeloma, polycythemia vera and myeloproliferative disorders). Calcium, copper, zinc, selenium and bromine were correlated with other biological parameters, including hematocrit, WBC and platelet counts, ESR, fibrinogen, transferrin, ceruloplasmin, haptoglobin, orosomucoid, antitrypsin, serum protein, albumin, alph 2-globulin, alkaline phosphatase, SGPT, LDH, gamma-GT, cholesterol, triglycerides, glycemia, urea, uric acid, creatinine, beta 2-microglobulin, CEA and C1g assay for circulating immune complexes. Copper was correlated with the different inflammatory tests (all P values < 0,01) and with the value of th C1g assay (P < 0,001). Zinc was inversely correlated with the inflammatory tests. The Cu/Zn ratio was thus significantly related to the importance of inflammation (all P values < 0,01). Calcium and zinc were correlated with albumin (P < 0,05). Selenium was positively correlated with gamma-GT (P < 0,001), and also with glycemia (P < 0,001) and alkaline phosphatase (P < 0,001), and also with glycemia (P < 0,001). Bromine was not significantly associated with any other biological parameter. The significance of these associations is discussed. [less ▲]

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See detailCorrelation of T-Helper Secretory Differentiation and Types of Antigen-Presenting Cells in Squamous Intraepithelial Lesions of the Uterine Cervix
al-Saleh, W.; Giannini, S. L.; Jacobs, Nathalie ULg et al

in Journal of Pathology (The) (1998), 184(3), 283-90

This study addressed the notion that the progression of cervical cancer is associated with a T-helper 2 (TH2) immunodeviation by analysing cytokine expression in 60 cervical biopsy specimens, spanning the ... [more ▼]

This study addressed the notion that the progression of cervical cancer is associated with a T-helper 2 (TH2) immunodeviation by analysing cytokine expression in 60 cervical biopsy specimens, spanning the spectrum from normal cervical tissue to high-grade squamous intraepithelial lesions (SILs). The biopsies were analysed by immunohistochemistry for the expression of TH1 [interleukin-2 (IL2), interferon gamma (IFN gamma)] and of TH2-type cytokines (IL4, IL6). Positive cells were usually observed in the subepithelial connective tissue, where most CD4+ cells were also detected. The density of IL2+ cells was significantly lower in high-grade SILs than in normal tissues taken either from the ectocervix or from the transformation zone. In contrast, significantly higher densities of IL4+ cells and, to a lesser degree, IL6+ cells were found in SIL biopsies compared with histologically normal tissues taken from the adjacent ectocervical region. A significantly higher IL4+/CD4+ cell ratio was also found in high-grade SILs (82 per cent) than in normal cervical biopsies taken from the transformation zone of healthy women showing squamous metaplasia (27 per cent). The elevated density of TH2+ cells in SIL biopsies was associated with both the expression of HLA-DR by keratinocytes and a diminished number of intraepithelial Langerhans' cells (CD1a+). In conclusion, the increased TH2+/CD4+ cell ratio in SIL biopsies suggest the presence, during cervical carcinogenesis, of a TH2 immunodeviation that could participate in the immunoescape of preneoplastic cervical keratinocytes. [less ▲]

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See detailCorrelation of the Devonian-Carboniferous Boundary deposits in Eurasia.
Bouckaert, J; Durkina, AV; Simakov, KV et al

in Simakov, K (Ed.) Biostratigraphy and fauna of the Devonian-Carboniferous deposits. XIV Pacific Science Congress. Field Excursion Guidebook. 8 (1979)

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See detailCorrelation of the proposed Conodont based Upper Devonian substages boundary levels into the neritic and terrestrial Miospore zonation
Streel, Maurice ULg; Loboziak

in Newsletter. Subcommission on Devonian Stratigraphy (2000), 17

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See detailCorrelation relationships of stratospheric molecular constituents from high spectral resolution, ground-based infrared solar absorption spectra
Rinsland, C. P.; Goldman, A.; Connor, B. J. et al

in Journal of Geophysical Research. Atmospheres (2000), 105(D11), 14637-14652

Comparisons of chemically active species with chemically inert tracers are useful to quantify transport and mixing and assess the accuracy of model predictions. We report measurements of chemically active ... [more ▼]

Comparisons of chemically active species with chemically inert tracers are useful to quantify transport and mixing and assess the accuracy of model predictions. We report measurements of chemically active species and chemically inert tracers in the stratosphere derived from the analysis of infrared solar absorption spectra recorded with a ground-based Fourier transform spectrometer operated typically at 0.005- to 0.01-cm(-1) spectral resolution. The measurements were recorded from Kitt Peak in southern Arizona (latitude 31.9 degrees N, 111.6 degrees W, 2.09 km altitude). Time series of N2O, CH4, O3, and HNO3 vertical profiles have been retrieved from measurements in microwindows. From these results, correlations between N2O and CH4 stratospheric mixing ratios and between O3 and HNO3 lower stratospheric mixing ratios have been derived. The measured correlations between N2O versus CH4 mixing ratios are compact and show little variability with respect to season in quantitative agreement with Atmospheric Trace Molecule Spectroscopy Experiment (ATMOS) spring and autumn measurements recorded near the same latitude. Lower stratospheric O3 versus HNO3 mixing ratios measured during low to moderate aerosol loading time periods also show a compact relations though the HNO3/O3 slope is a factor of 2 lower than obtained from November 1994 ATMOS measurements near the Same latitude. We also compare Kitt Peak and ATMOS N2O versus CH4 and O3 versus HNO3 relations obtained by averaging the measurements over two broad stratospheric layers. This comparison avoids bias from the a priori profiles and the limited vertical resolution of the ground-based observations. [less ▲]

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See detailcorrelations and sequence stratigraphy of the Frasnian of Belgium.
Da Silva, Anne-Christine ULg; Mabille, Cedric; Boulvain, Frédéric ULg

in Book of Abstract - 25th meeting of the IAS - Patras (2007)

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