Search results for " Normal"
showing 10 items of 336 documents
Normal, Abby Normal, Prefix Normal
2014
A prefix normal word is a binary word with the property that no substring has more 1s than the prefix of the same length. This class of words is important in the context of binary jumbled pattern matching. In this paper we present results about the number \(\textit{pnw}(n)\) of prefix normal words of length n, showing that \(\textit{pnw}(n) =\Omega\left(2^{n - c\sqrt{n\ln n}}\right)\) for some c and \(\textit{pnw}(n) = O \left(\frac{2^n (\ln n)^2}{n}\right)\). We introduce efficient algorithms for testing the prefix normal property and a “mechanical algorithm” for computing prefix normal forms. We also include games which can be played with prefix normal words. In these games Alice wishes t…
EFFECT OF IMAGE NORMALIZATION ON CAROTID PLAQUE CLASSIFICATION AND THE RISK OF IPSILATERAL HEMISFERIC ISCHEMIC EVENTS. RESULTS FROM THE ASYMPTOMATIC …
2005
The aim of this study was to determine the effect of image normalization on plaque classification and the risk of ipsilateral ischemic neurologic events in patients with asymptomatic carotid stenosis. The first 1,115 patients recruited to the Asymptomatic Carotid Stenosis and Risk of Stroke (ACSRS) study with a follow-up of 6 to 84 months (mean 37.1 months) were included in this study. Duplex ultrasonography was used for grading the degree of internal carotid artery stenosis and for plaque characterization (types 1-5), which was performed before and after image normalization. One hundred sixteen ipsilateral ischemic hemispheric events occurred. Image normalization resulted in 60% of plaques…
$MC$-hypercentral groups
2007
This paper is devoted to the imposition of some chain conditions on groups having a generalized central series. It is also given a characterization of MC-groups with finite abelian section rank: such class of groups is a suitable enlargement of the class of FC-groups. Mathematics Subject Classification: 20F24; 20F14
Design of a customized pattern for improving color constancy across camera and illumination changes
2010
International audience; This paper adresses the problem of color constancy on a large image database acquired with varying digital cameras and lighting conditions. Automatic white balance control proposed by an available commercial camera is not sufficient to provide reproducible color classification. A device-independent color representation may be obtained by applying a chromatic adaptation transform, from a calibrated color checker pattern included in the field of view. Instead of using the standard Macbeth color checker, we suggest to select judicious colors to design a customized pattern from contextual information. A comparative study demonstrates that this approach insures a stronger…
De la standardisation à la normalisation de la gestion médicalisée à l'hôpital : L’apport de la méthode de compensation structurelle et conjoncturelle
1996
Utilization of GHM in budget allocation leads to a reduction of strategic behaviors and restores equity between hospitals. However, heterogeneousness of GHM, with subgroups, is also generating perverse effects. The contractual economical analysis, applied to the statistical modelization of Quantin et al. (1995), underlines how the opportunist behaviors can be reduced. As the PMSI is almost unanimously adopted and considered as an irreversible investment, this approach generates questions on ways to improve the tool. The ultimate goal is to move from standardized costs tonormalized (optimized) costs for maximum efficiency of the tool. Finally, this statistical analysis generates a financial …
Questions and controversies in the study of time-varying functional connectivity in resting fMRI.
2020
The brain is a complex, multiscale dynamical system composed of many interacting regions. Knowledge of the spatiotemporal organization of these interactions is critical for establishing a solid understanding of the brain’s functional architecture and the relationship between neural dynamics and cognition in health and disease. The possibility of studying these dynamics through careful analysis of neuroimaging data has catalyzed substantial interest in methods that estimate time-resolved fluctuations in functional connectivity (often referred to as “dynamic” or time-varying functional connectivity; TVFC). At the same time, debates have emerged regarding the application of TVFC analyses to re…
KERNEL ESTIMATION OF THE TRANSITION DENSITY IN BIFURCATING MARKOV CHAINS
2023
We study the kernel estimator of the transition density of bifurcating Markov chains. Under some ergodic and regularity properties, we prove that this estimator is consistent and asymptotically normal. Next, in the numerical studies, we propose two data-driven methods to choose the bandwidth parameters. These methods are based on the so-called two bandwidths approach.
"E' la stampa bellezza!": la corte costituzionale alle prese con la risposta carceraria alle lesioni mediatiche della reputazione
2021
L'articolo analizza in chiave critica la posizione assunta dalla Corte costituzionale italiana in ordine ai criteri che il giudice penale è tenuto ad osservare nella scelta tra sanzione detentiva o pecuniaria in materia di diffamazioni commesse col mezzo della stampa o con altro mezzo di diffusione. .
Semigenerated Carnot algebras and applications to sub-Riemannian perimeter
2021
This paper contributes to the study of sets of finite intrinsic perimeter in Carnot groups. Our intent is to characterize in which groups the only sets with constant intrinsic normal are the vertical half-spaces. Our viewpoint is algebraic: such a phenomenon happens if and only if the semigroup generated by each horizontal half-space is a vertical half-space. We call semigenerated those Carnot groups with this property. For Carnot groups of nilpotency step 3 we provide a complete characterization of semigeneration in terms of whether such groups do not have any Engel-type quotients. Engel-type groups, which are introduced here, are the minimal (in terms of quotients) counterexamples. In add…
Valoración de los parámetros normales de ecocardiografía fetal en 2D y 3D a lo largo de la gestación
2015
La evaluación cardiaca fetal mediante ecografía forma parte de nuestra práctica clínica diaria. Por tanto, es muy importante disponer de valores de referencia para todos los parámetros cardiacos ajustados a nuestra población. Una forma de describir una medida de un parámetro cardiaco es mediante los Z score, que expresan cuántas desviaciones estándar está una observación por encima o debajo de la media esperada. Los Z score permiten normalizar el tamaño de las estructuras cardiacas respecto a algún parámetro de la biometría fetal, en vez de con la edad gestacional. Los Z-score son útiles para determinar si una estructura cardiaca mantiene su crecimiento respecto al crecimiento somático glob…