70 research outputs found
Sustainable control of grassland small mammals
International audienceSmall mammals such as the European rabbits, the plateau pikas, the prairie dogs have been traditionally perceived as pests and targeted for control on a large scale despite their importance as key-stone species in their native ecosystem. This is also the case for the fossorial form of the water vole (Arvicola terrestris). This species can reach large population densities and causes heavy damage to grassland with subsequent economic losses for farmers (9,000 to 25,000 ⏠for a 70 ha farm during an outbreak year in Franche-Comté, France). However, higher population densities of A. terrestris and also of Microtus arvalis, help maintaining a large and rich community of vole predators. Such non-target species (red kite, common buzzard, wild boar, red fox, etc.) are impacted, some of them heavily, by the unconditional use of rodenticides (e.g. bromadiolone). In order to minimize the use of rodenticides in controlling A. terrestris populations, a long term research program has been undertaken since the late 80s, aiming at identifying the key-parameters of such regional systems. Based on a systems approach, this collaborative research network involves academic researchers, farmer, game, conservationist organizations and governmental and local administrations together. On a regional scale (area of about 2500 km2), Delattre et al. (1992), Giraudoux et al. (1997), Fichet et al. (2000) provided evidence that M. arvalis and A. terrestris population dynamic patterns correlate with land composition. On a sectorial scale (area of about 25 km2), Delattre et al. (1996), Delattre et al. (1999) showed for M. arvalis that landscape heterogeneity dampen population fluctuations and may modulate prey/predator relationships; Duhamel et al. (2000) that A. terrestris outbreak epicentres occur in homogeneous grassland and Foltete et al. (2008) that hedgerow networks slow down the propagation of travelling waves. On a local scale (area of about 0.01 km2), Delattre et al. (2006), Morilhat et al. (2007, 2008) showed that A. terrestris population growth was enhanced by larger gallery networks of Talpa europea, was slowed down by ploughing and cattle tramping and was modified by neighbouring landscape (10 - 100 ha). This led to a number of recommendations, now implemented for a more sustainable control of A. terrestris (Delattre and Giraudoux 2009) with substantial decrease in rodenticide utilization and lesser impact on non-target species. Poster downloadable at: http://pagesperso-orange.fr/giraudoux/PosterSETAC_120416_1200.pd
Forme atypique dâune maladie de Lyme
La maladie de Lyme est une zoonose qui se manifeste essentiellement par des signes cutanĂ©s, articulaires, neurologiques et cardiaques. Elle peut exceptionnellement mimer une dermatomyosite. Nous rapportons l'observation d'une patiente ĂągĂ©e de 37 ans qui a prĂ©sentĂ© des myalgies et un Ă©rythroedĂšme de la face et en pĂ©ri-orbitaire. Une dermatomyosite a Ă©tĂ© fortement suspectĂ©e devant une Ă©lĂ©vation des enzymes musculaires. Elle a Ă©tĂ© traitĂ©e par une corticothĂ©rapie Ă forte dose. L'Ă©volution a Ă©tĂ© marquĂ©e par l'aggravation des myalgies et l'apparition d'un dĂ©ficit musculaire. Elle a Ă©tĂ© alors hospitalisĂ©e dans notre service. Les enzymes musculaires Ă©taient Ă©levĂ©es. L'Ă©lectromyogramme Ă©tait sans anomalies. Le bilan immunologique Ă©tait nĂ©gatif. Une enquĂȘte infectieuse a Ă©tĂ© rĂ©alisĂ©e retrouvant une sĂ©rologie de Lyme positive. AprĂšs administration d'une antibiothĂ©rapie adaptĂ©e, l'Ă©volution Ă©tait bonne avec disparition du tableau clinico-biologique de dermatomyosite. La prĂ©cocitĂ© du diagnostic et l'instauration d'un traitement efficace permet d'Ă©viter des complications graves
List of reviewers
The following is a list of reviewers who from January 2007 to December 2007, have contributed their time and talent to the success of the publication of the ELECTRONIC LETTERS ON COMPUTER VISION AND IMAGE ANALYSIS
Combined DWT and DCT Image Compression Using Sliding RLE Technique
A number of compression schemes were put forward to achieve high compression factors with high image quality at a low computational time. In this paper, a combined transform coding scheme is proposed which is based on discrete wavelet (DWT) and discrete cosine (DCT) transforms with an added new enhancement method, which is the sliding run length encoding (SRLE) technique, to further improve compression.
The advantages of the wavelet and the discrete cosine transforms were utilized to encode the image. This first step involves transforming the color components of the image from RGB to YUV planes to acquire the advantage of the existing spectral correlation and consequently gaining more compression.
DWT is then applied to the Y, U and V color space information giving the approximate and the detail coefficients. The detail coefficients are quantized, coded using run length encoding (RLE) and SRLE.
The approximate coefficients were coded using DCT, since DCT has superior compression performance when image information has poor power concentration in high frequency areas. This output is also quantized, coded using RLE and SRLE.
Test results showed that the proposed DWT DCT SRLE system proved to have encouraging results in terms of Peak Signal-to-Noise Ratio (PSNR), Compression Factor (CF) and execution time when compared with some DWT based image compressions
Imunotherapy : new drugs, different adverse events
Imunoterapija je v zadnjih letih postala eden izmed pomembnih naÄinov sistemskega zdravljenja bolnikov z rakom. PriÄa smo bili razliÄnim imunskim strategijam, med temi je tudi inhibicija kontrolnih toÄk. Zdravila proti CTLA-4, PD-1 in PD-L1 so protitelesa proti zaviralcem kontrolnih toÄk, ki lahko poviĆĄajo imunsko aktivnost proti rakavim celicam in tako ojaÄajo imunski odgovor proti raku. VeÄja uporaba teh zdravil pa je privedla do pojava posebne vrste imunsko pogojenih neĆŸelenih uÄinkov. Ti se najpogosteje izrazijo na koĆŸi, Ärevesju, ĆŸlezah z notranjim izloÄanjem, pljuÄih in miĆĄiÄno-skeletnem sistemu, lahko pa je prizadet kateri koli organ. VeÄina imunsko pogojenih neĆŸelenih uÄinkov je blagih do zmernih, v literaturi pa obstajajo poroÄila o hudih in ĆŸivljenje ogroĆŸajoÄih. Pomembna je njihova zgodnja prepoznava in zdravljenje, kakor tudi multidisciplinaren pristop, da prepreÄimo resne zaplete.Over the past years, immunotherapy has become an important systemic treatment strategy for cancer patients. We have seen multiple different strategies, and checkpoint blockade is one them. Anti-cytotoxic T-lymphocyte-associated protein 4 (CTLA-4), programmed cell death-1 (PD-1), and programmed death-ligand 1 (PD-L1) are antibodies against checkpoint inhibitors that can increase immune activity against cancer, thus making the immune system stronger against cancer cells. However, the increasing use of these agents has exposed a discrete group of immune-related adverse events (irAEs). Skin, gut, endocrine, lung, and musculoskeletal irAEs are the most common, although every organ can be affected. The majority of irAEs are mild to moderate in severity, however, serious and life-threatening irAEs are reported in literature. Early detection and treatment of irAEs is important, and a multidisciplinary approach is sometimes needed to prevent serious consequences
DĂ©tection de la vitesse de la marche Ă l'aide d'un radar Doppler : Analyse par ondelettes
International audienceLa santĂ©, le bien-ĂȘtre et lâautonomie dâune personne ĂągĂ©e dĂ©pendent pour partie de sa capacitĂ© Ă se mouvoir. Les Ă©valuations cliniques de la mobilitĂ© sont pratiquĂ©es en consultation gĂ©riatrique au travers de tests standardisĂ©s. Cependant, une surveillance quotidienne peut fournir plus dâinformation s sur lâĂ©tat fonctionnel dâune personne tout en prĂ©servant son autonomie Ă domicile. Cet article propose une nouvelle mĂ©thode dâune surveillance continue de la vitesse de la marche Ă travers un systĂšme radar Doppler placĂ© Ă domicile en se basant sur lâanalyse de la transformĂ©e en ondelettes. Plus de 70 ondelettes mĂšres ont Ă©tĂ© testĂ©es sur des signaux de marche obtenus par le radar. Un systĂšme optoĂ©lectronique (Vicon) a Ă©tĂ© utilisĂ© durant lâexpĂ©rimentation afin de choisir la/les convenable(s) ondelette(s) mĂšre(s). Le coefficient de corrĂ©lation de Pearson (Ï) a Ă©tĂ© calculĂ© entre les signaux de vitesse de la marche obtenus par le systĂšme radar et ceux obtenus par le systĂšme Vicon. Nos rĂ©sultats suggĂšrent lâutilisation de Daubechies5 et Symlet7 Ă©tant donnĂ© une valeur Ï de 0,86 et 0,85, respectivement et une valeur dâerreur quadratique infĂ©rieur Ă 0,05 m/
List of reviewers
The following is a list of reviewers who from January 2007 to December 2007, have contributed their time and talent to the success of the publication of the ELECTRONIC LETTERS ON COMPUTER VISION AND IMAGE ANALYSIS
Texture Classification with Local Binary Pattern Based on Continues Wavelet Transformation
Abstract: In this paper, a new algorithm which is based on the continues wavelet transformation and local binary patterns (LBP) for content based texture image classification is proposed. We improve the Local Binary Pattern approach with Wavelet Transformation to propose the texture classification. We used 12 classes of Brodatz textures data base for proposed method. Each class is divided to 64 texture image and then wavelet transformation is applied to each texture. After transformed texture from wavelet the feature extraction matrix is formation using LBP. The same concept is utilized at LBP calculation which is generating nine LBP patterns from a given 3Ă3 pattern. Finally, nine LBP histograms are calculated which are used as a feature vector for image classification. Two experiments have been carried out for proving the worth of our algorithm. It is further mentioned that the database considered for experiments are Brodatz database. We verify the other method and proposed method is very good and efficient for classification texture image
Espaces hybrides couleur : texture adaptés au comptage d'épis de blé
Une méthode d'analyse d'image texture - couleur basée sur la détermination d'un espace hybride couleur a été développée dans le cadre d'une étude de faisabilité d'un systÚme de comptage (semi)-automatique des épis de blé dans un champ, pour une prédiction précoce de rendement. A cette fin, des analyses couleur et de texture (paramÚtres d'Haralick) sont utilisées pour permettre une nouvelle représentation des images prises dans un espace spécifique (espace hybride) construit à partir de connaissances a priori sur les images. Les méthodes classiques de classification et de segmentation des images, combinées à des informations morphologiques sur les épis, sont appliquées pour le comptage. Le taux de reconnaissance des épis est compris entre 73% et 85% sur les quelques images prises pendant le stade de floraison. Couplées avec le temps, la luminosité et en accord avec les modÚles de développement du blé, les informations générées à partir de l'algorithme implémentés dans cette étude semblent significatives pour pouvoir évaluer le troisiÚme apport d'engrais azotés qui se déroule au début de la floraison
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