1,040 research outputs found
Vision dynamique pour la navigation d'un robot mobile
Les travaux prĂ©sentĂ©s dans cette thĂšse concernent lâĂ©tude des fonctionnalitĂ©s visuelles sur des scĂšnes dynamiques et ses applications Ă la robotique mobile. Ces fonctionnalitĂ©s visuelles traitent plus prĂ©cisĂ©ment du suivi visuel dâobjets dans des sĂ©quences dâimages. Quatre mĂ©thodes de suivi visuel ont Ă©tĂ© Ă©tudiĂ©es, dont trois ont Ă©tĂ© dĂ©veloppĂ©es spĂ©cifiquement dans le cadre de cette thĂšse. Ces mĂ©thodes sont : (1) le suivi de contours par un snake, avec deux variantes permettant son application Ă des sĂ©quences dâimages couleur ou la prise en compte de contraintes sur la forme de lâobjet suivi, (2) le suivi de rĂ©gions par diffĂ©rences de motifs, (3) le suivi de contours par corrĂ©lation 1D, et enfin (4) la mĂ©thode de suivi dâun ensemble de points, fondĂ©e sur la distance de Hausdorff, dĂ©veloppĂ©e lors dâune thĂšse prĂ©cĂ©dente. Ces mĂ©thodes ont Ă©tĂ© analysĂ©es pour diffĂ©rentes tĂąches relatives Ă la navigation dâun robot mobile; une comparaison dans diffĂ©rents contextes a Ă©tĂ© effectuĂ©e, donnant lieu Ă une caractĂ©risation des cibles et des conditions pour lesquelles chaque mĂ©thode donne de bons rĂ©sultats. Les rĂ©sultats de cette analyse sont pris en compte dans un module de planification perceptuelle, qui dĂ©termine quels objets (amers plans) le robot doit suivre pour se guider le long dâune trajectoire. Afin de contrĂŽler lâexĂ©cution dâun tel plan perceptuel, plusieurs protocoles de collaboration ou dâenchaĂźnement entre mĂ©thodes de suivi visuel ont Ă©tĂ© proposĂ©s. Finalement, ces mĂ©thodes, ainsi quâun module de contrĂŽle dâune camĂ©ra active (site, azimut, zoom), ont Ă©tĂ© intĂ©grĂ©es sur un robot. Trois expĂ©rimentations ont Ă©tĂ© effectuĂ©es: a) le suivi de route en milieu extĂ©rieur, b) le suivi de primitives pour la navigation visuelle en milieu intĂ©rieur, et c) le suivi dâamers plans pour la navigation fondĂ©e sur la localisation explicite du robot. ABSTRACT : The work presented on this thesis concerns the study of visual functionalities over dynamic scenes and their applications to mobile robotics. These visual functionalities consist on visual tracking of objects on image sequences. Four methods of visual tracking has been studied, from which tree of them has been developed specifically for the context of this thesis. These methods are: (1) snakes contours tracking, with two variants, the former, to be able to applying it to a sequence of color images and the latter to consider form constraints of the followed object, (2) the tracking of regions by templates differences, (3) contour tracking by 1D correlation, and (4) the tracking method of a set of points, based on Hausdorff distance, developed on a previous thesis. These methods have been analyzed for different tasks, relatives to mobile robotâs navigation. A comparison for different contexts has been done, given to a characterization of objects and conditions for which each method gives the best results. Results from this analysis has been take into account on a perceptual planification module, that determines which objects (plane landmarks) must be tracked by the robot, to drive it over a trajectory. In order to control the execution of perceptual plan, a lot of collaboration or chaining protocols have been proposed between methods. Finally, these methods and a control module of an active camera (pan, tilt, zoom), has been integrated on a robot. Three experiments have been done: a) road tracking over natural environments, b) primitives tracking for visual navigation over human environments and c) landmark tracking for navigation based on explicit localization of robo
Death receptor 5 expression is inversely correlated with prostate cancer progression.
Prostate carcinoma (PCa) is one of the most common cancers in men. Prostate-specific antigen (PSA) has been widely used to predict the outcome of PCa and screening with PSA has resulted in a decline in mortality. However, PSA is not an optimal prognostic tool as its sensitivity may be too low to reduce morbidity and mortality. Consequently, there is a demand for additional robust biomarkers for prostate cancer. Death receptor 5 (DR5) has been implicated in the prognosis of several cancers and it has been previously shown that it is negatively regulated by Yin Yang 1 (YY1) in prostate cancer cell lines. The present study investigated the clinical significance of DR5 expression in a prostate cancer patient cohort and its correlation with YY1 expression. Immunohistochemical analysis of protein expression distribution was performed using tissue microarray constructs from 54 primary PCa and 39 prostatic intraepithelial neoplasia (PIN) specimens. DR5 expression was dramatically reduced as a function of higher tumor grade. By contrast, YY1 expression was elevated in PCa tumors as compared with that in PIN, and was increased with higher tumor grade. DR5 had an inverse correlation with YY1 expression. Bioinformatic analyses corroborated these data. The present findings suggested that DR5 and YY1 expression levels may serve as progression biomarkers for prostate cancer
Atresia anal en el perro y el gato
Ponencia en el XXXI CONGRESO NACIONAL DE LA ASOCIACIĂN MEXICANA DE MĂDICOS VETERINARIOS ESPECIALISTAS EN PEQUEĂAS ESPECIES, A.C.La atresia anal es una patologĂa poco frecuente con una prevalencia del 0.13% y del 1.6% para el caso de los perros y de los gatos menores de un año de edad respectivamente, atendidos en nuestro centro hospitalario. En el presente documento se expone la experiencia en el diagnĂłstico y manejo de tres pacientes con atresia anal, realizamos una revisiĂłn de las teorĂas de los mecanismos fisiopatolĂłgicos involucrados en el desarrollo embrionario, y con base en esos criterios, sugerimos la mejor clasificaciĂłn del tipo de atresia anal partiendo del anĂĄlisis de las propuestas existentes y su relaciĂłn con los conceptos actuales de la anatomĂa embriolĂłgica
Anal atresia in dogs and cats: the scope from three clinical cases
Anal atresia is defined as the lack of a complete communication between rectum and the anus, it is the most common anorectal malformation and has been observed mainly in dogs. It has been associated to alterations of anogenital differentiation of the cloaca in the embryo, however, the exact mechanisms remain unclear. Different criteria have been proposed in the literature to classify anal atresia. This study shows the diagnosis, treatment and outcome of three cases (two dogs and one cat) with anal atresia. The frequency of this malformation in our hospital is reported as well as a discussion of the theories of the processes involved in the development of anal atresia, and a revised classification for this pathology according to embryo anatomy and development is proposed.La atresia anal se define como la falta de comunicaciĂłn del recto y el perineo a travĂ©s del ano, siendo esta la malformaciĂłn anorrectal reportada con mayor frecuencia en el perro y el gato. EstĂĄ asociada a alteraciones en la diferenciaciĂłn de la cloaca en el embriĂłn en desarrollo; sin embargo los mecanismos fisiopatolĂłgicos involucrados hasta el momento no han sido completamente esclarecidos. En el presente documento se expone la experiencia en el diagnĂłstico y manejo de tres pacientes (dos perros y un gato) con atresia anal, presentamos los resultados del anĂĄlisis de la frecuencia de esta patologĂa en nuestro centro hospitalario, realizamos una revisiĂłn detallada de las teorĂas de los mecanismos fisiopatolĂłgicos involucrados en el desarrollo embrionario y con base en estos criterios, sugerimos la clasificaciĂłn del tipo de atresia anal mĂĄs apropiada partiendo del anĂĄlisis de las propuestas existentes y su relaciĂłn con los conceptos actuales de la anatomĂa embriolĂłgica.Al Consejo Nacional de Ciencia y TecnologĂa de MĂ©xico (CONACyT) por el esquema de becas para los alumnos en el Programa de EspecializaciĂłn en Medicina y CirugĂa en Perros y Gatos de la Facultad de Medicina Veterinaria y Zootecnia de la Universidad AutĂłnoma del Estado de MĂ©xico, inserto en el PadrĂłn Nacional de Excelencia-CONACyT
Estimation of the transverse sway motion of a biped robot during the march
Debido al balanceo generado por la dinĂĄmica natural y perturbaciones durante la marcha de un robot humanoide, es difĂcil predecir su postura en determinado instante a lo largo de la misma, complicando asĂ el desarrollo de tareas de
manipulaciĂłn, cooperaciĂłn, evasiĂłn de obstĂĄculos, retroalimentaciĂłn servo-visual, entre otras. En este documento se describe una metodologĂa para predecir el movimiento de balanceo en el plano transversal del robot, a partir de la trayectoria de un punto fijo en su estructura mecĂĄnica. Se considera el estudio de dos modelos matemĂĄticos para aproximar el movimiento de balanceo del humanoide: aproximaciĂłn mediante una funciĂłn sinusoidal y aproximaciĂłn por series de Fourier. En ambos casos, es necesario el conocimiento de los parĂĄmetros involucrados del modelo, por lo que se implementan tres tĂ©cnicas de aproximaciĂłn paramĂ©trica: mĂnimos cuadrados e identificaciĂłn algebraica para el caso de la aproximaciĂłn sinusoidal, y el cĂĄlculo de coeficientes para el caso de las series de Fourier. Para validar la metodologĂa, se lleva a cabo el seguimiento del robot en tiempo real puesto que la trayectoria del punto de interĂ©s es afectada por diversos factores como la fricciĂłn, inclinaciĂłn e imperfecciones de la superficie, el estado de conservaciĂłn del robot, entre otros. A partir de diversos experimentos, se desarrolla una comparaciĂłn cuantitativa entre las diferentes
aproximaciones para verificar aquel que mejor reproduce a la dinĂĄmica del balanceo del robot.Peer Reviewe
MSPEP: PROGRAMA PARA LA SINTESIS MULTIPLE Y SIMULTANEA DE PEPTIDOS
Los pĂ©ptidos sintĂ©ticos son de gran aplicabilidad en la actualidad por su utilizaciĂłn en el desarrollo de vacunas, comĂł antigenos especificos en sistemas diagnosticos para la detecciĂłn de anticuerpos y en el estudio de la estructura y la actividad de las diferentes zonas activas de los virus, entre otras aplicaciones. En este trabajo describimos la sĂntesis quĂmica en fase sĂłlida de varios pĂ©ptidos correspondientes a HCV, VIH, y Trypanosoma cruzi. El diseño de pĂ©ptidos se realizĂł mediante programas de computaciĂłn y consulta en base de datos de proteĂnas y con el objetivo de auxiliar Ia sĂntesis mĂșltiple y simultĂĄnea de los pĂ©ptidos en fase sĂłlida se diseño y desarrollĂł un nuevo programa (MSPep). Esta aplicaciĂłn se ejecuta sobre Microsoft Windows 95' utilizando Las facilidades inherentes
a esta plataforma gråfica e incluye nuevas opciones que no se encuentran en sistemas anteriores que se ejecutan sobre MS-DOS. Todos los péptidos sintetizados fueron evaluados en Los ensayos ultramicroELISA respectivos, frente a muestras positivas caracterizadas para cada agente etiológieo, obteniéndose una sensibilidad en HCV entre 77,7 y 100 %, en VIH del 53 y
100 % y en Trypanosoma cruzi de on 100 %. En todos los casos la especificidad fue de un 100 %
CD133-directed CAR T-cells for MLL leukemia: on-target, off-tumor myeloablative toxicity
This work has been supported by the European Research Council
(CoG-2014-646903, PoC-2018-811220) to PM, the Spanish Ministry
of Economy and Competitiveness (MINECO, SAF-SAF2016-80481-
R, BIO2017-85364-R) to PM and EE, the Generalitat de Catalunya
(SGR330, SGR102 and PERIS) to PM and EE, the Spanish Association against cancer (AECC-CI-2015) to CB, and the Health Institute
Carlos III (ISCIII/FEDER, PI14-01191) to CB. PM also acknowledges financial support from the Obra Social La Caixa-FundaciĂČ Josep
Carreras. SRZ and TV are supported by a Marie Curie fellowships.
OM is supported by the Catalan Government through a Beatriu de
Pinos fellowship. MB is supported by MINECO through a PhD
scholarship. PM is an investigator of the Spanish Cell Therapy
cooperative network (TERCEL)
Energy Metabolism in H460 Lung Cancer Cells: Effects of Histone Deacetylase Inhibitors
BACKGROUND: Tumor cells are characterized by accelerated growth usually accompanied by up-regulated pathways that ultimately increase the rate of ATP production. These cells can suffer metabolic reprogramming, resulting in distinct bioenergetic phenotypes, generally enhancing glycolysis channeled to lactate production. In the present work we showed metabolic reprogramming by means of inhibitors of histone deacetylase (HDACis), sodium butyrate and trichostatin. This treatment was able to shift energy metabolism by activating mitochondrial systems such as the respiratory chain and oxidative phosphorylation that were largely repressed in the untreated controls. METHODOLOGY/PRINCIPAL FINDINGS: Various cellular and biochemical parameters were evaluated in lung cancer H460 cells treated with the histone deacetylase inhibitors (HDACis), sodium butyrate (NaB) and trichostatin A (TSA). NaB and TSA reduced glycolytic flux, assayed by lactate release by H460 cells in a concentration dependent manner. NaB inhibited the expression of glucose transporter type 1 (GLUT 1), but substantially increased mitochondria bound hexokinase (HK) activity. NaB induced increase in HK activity was associated to isoform HK I and was accompanied by 1.5 fold increase in HK I mRNA expression and cognate protein biosynthesis. Lactate dehydrogenase (LDH) and pyruvate kinase (PYK) activities were unchanged by HDACis suggesting that the increase in the HK activity was not coupled to glycolytic flux. High resolution respirometry of H460 cells revealed NaB-dependent increased rates of oxygen consumption coupled to ATP synthesis. Metabolomic analysis showed that NaB altered the glycolytic metabolite profile of intact H460 cells. Concomitantly we detected an activation of the pentose phosphate pathway (PPP). The high O(2) consumption in NaB-treated cells was shown to be unrelated to mitochondrial biogenesis since citrate synthase (CS) activity and the amount of mitochondrial DNA remained unchanged. CONCLUSION: NaB and TSA induced an increase in mitochondrial function and oxidative metabolism in H460 lung tumor cells concomitant with a less proliferative cellular phenotype
The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the extended Baryon Oscillation Spectroscopic Survey and from the second phase of the Apache Point Observatory Galactic Evolution Experiment
The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in
operation since July 2014. This paper describes the second data release from
this phase, and the fourteenth from SDSS overall (making this, Data Release
Fourteen or DR14). This release makes public data taken by SDSS-IV in its first
two years of operation (July 2014-2016). Like all previous SDSS releases, DR14
is cumulative, including the most recent reductions and calibrations of all
data taken by SDSS since the first phase began operations in 2000. New in DR14
is the first public release of data from the extended Baryon Oscillation
Spectroscopic Survey (eBOSS); the first data from the second phase of the
Apache Point Observatory (APO) Galactic Evolution Experiment (APOGEE-2),
including stellar parameter estimates from an innovative data driven machine
learning algorithm known as "The Cannon"; and almost twice as many data cubes
from the Mapping Nearby Galaxies at APO (MaNGA) survey as were in the previous
release (N = 2812 in total). This paper describes the location and format of
the publicly available data from SDSS-IV surveys. We provide references to the
important technical papers describing how these data have been taken (both
targeting and observation details) and processed for scientific use. The SDSS
website (www.sdss.org) has been updated for this release, and provides links to
data downloads, as well as tutorials and examples of data use. SDSS-IV is
planning to continue to collect astronomical data until 2020, and will be
followed by SDSS-V.Comment: SDSS-IV collaboration alphabetical author data release paper. DR14
happened on 31st July 2017. 19 pages, 5 figures. Accepted by ApJS on 28th Nov
2017 (this is the "post-print" and "post-proofs" version; minor corrections
only from v1, and most of errors found in proofs corrected
Measurement of the top quark-pair production cross section with ATLAS in pp collisions at \sqrt{s}=7\TeV
A measurement of the production cross-section for top quark pairs(\ttbar)
in collisions at \sqrt{s}=7 \TeV is presented using data recorded with
the ATLAS detector at the Large Hadron Collider. Events are selected in two
different topologies: single lepton (electron or muon ) with large
missing transverse energy and at least four jets, and dilepton (,
or ) with large missing transverse energy and at least two jets. In a
data sample of 2.9 pb-1, 37 candidate events are observed in the single-lepton
topology and 9 events in the dilepton topology. The corresponding expected
backgrounds from non-\ttbar Standard Model processes are estimated using
data-driven methods and determined to be events and events, respectively. The kinematic properties of the selected events are
consistent with SM \ttbar production. The inclusive top quark pair production
cross-section is measured to be \sigmattbar=145 \pm 31 ^{+42}_{-27} pb where
the first uncertainty is statistical and the second systematic. The measurement
agrees with perturbative QCD calculations.Comment: 30 pages plus author list (50 pages total), 9 figures, 11 tables,
CERN-PH number and final journal adde
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