Search results for "pattern"
showing 10 items of 4203 documents
Recognition of Root Canal Orifices in Video Sequences as a Future Support System During Endodontic Treatment
2009
Abstract Introduction The objective of this study was to show the practical application of computer-aided techniques for detecting root canal orifices through the access cavity using a video camera mounted on a microscope. Methods A minimum distance classification image recognition algorithm was tested in an in vitro study to assess the possibilities of computer-aided recognition of root canal orifices. A Motic DM143 digital stereo microscope (Motic Germany GmbH, Wetzlar, Germany) was used because it includes a video camera that can be connected via USB1.1 to any computer. Results The newly developed software is capable of communicating with a video camera and can automatically detect the r…
Survey of Spanish dentists on the prescription of antibiotics and antiseptics in surgery for impacted lower third molars
2015
Background: This study explored the attitude of registered dentists in Biscay towards prescribing antibiotics and/ or antiseptics to prevent potential infections after surgical extraction of completely bone-impacted third molars in otherwise healthy individuals, with no history of infection. Material and Methods: We sent letters to 931 registered dentists in Biscay, with an explanation of the study objectives, description of a case of lower third molar impaction, including a panoramic radiograph, and a questionnaire. The questionnaire asked whether they would prescribe antibiotics and/or antiseptics, in the hypothetical case of lower third molar extraction surgery presented, and if so, when…
Surrogate data approaches to assess the significance of directed coherence: Application to EEG activity propagation
2009
This paper addresses the topic of evaluating the significance of frequency domain measures of causal coupling in multivariate time series through generation of surrogate data. The considered approaches are the traditional Fourier Transform (FT) algorithm and a new causal FT (CFT) algorithm for surrogate data generation. Both algorithms preserve the FT modulus of the original series; differences are in the phase relationships, that are completely destroyed for FT surrogates and imposed after switching off the link over the considered causal direction for CFT surrogates. The ability of the algorithms to assess causality in the frequency domain was tested using the directed coherence as discri…
Self‐Reported Indicators of Hypersexuality and Its Correlates in a Female Online Sample
2014
Abstract Introduction Hypersexual behavior has been a controversial and much disputed issue in the field of sexual medicine. However, only little attention has been paid to hypersexual behavior in women. Therefore, to date there is limited knowledge on the behavioral patterns of hypersexuality in women. Aims The purpose of the present study was to examine which sexual behavioral patterns are associated with self‐reported indicators of hypersexuality in a female online sample. The second aim was to evaluate the association between hypersexuality and sexual risk behavior in women. Methods In total, 988 women participated in an online survey. Logistic regression analysis was conducted to exami…
Blocking by word frequency and neighborhood density in visual word recognition: A task-specific response criteria account
2004
International audience; Effects of blocking words by frequency class (high vs. low) and neighborhood density (high vs. low) were examined in two experiments using progressive demasking and lexical decision tasks. The aim was to examine the predictions of a task-specific response criteria account of list-blocking effects. Distinct patterns of blocking effects were obtained in the two tasks. In the progressive demasking task, a pure-list disadvantage was obtained to low frequency-high density words, whereas high frequency-low density produced a trend toward a pure-list advantage. In lexical decision, high-frequency words showed a pure-list advantage that was strongest in high-density words, w…
Phase information of time-frequency transforms as a key feature for classification of atrial fibrillation episodes
2015
[EN] Patients suffering from atrial fibrillation can be classified into different subtypes, according to the temporal pattern of the arrhythmia and its recurrence. Nowadays, clinicians cannot differentiate a priori between the different subtypes, and patient classification is done afterwards, when its clinical course is available. In this paper we present a comparison of classification performances when differentiating paroxysmal and persistent atrial fibrillation episodes by means of support vector machines. We analyze short surface electrocardiogram recordings by extracting modulus and phase features from several time-frequency transforms: short-time Fourier transform, Wigner-Ville, Choi-…
Does Bold Emphasis Facilitate the Process of Visual-Word Recognition?
2014
AbstractThe study of the effects of typographical factors on lexical access has been rather neglected in the literature on visual-word recognition. Indeed, current computational models of visual-word recognition employ an unrefined letter feature level in their coding schemes. In a letter recognition experiment, Pelli, Burns, Farell, and Moore-Page (2006), letters in Bookman boldface produced more efficiency (i.e., a higher ratio of thresholds of an ideal observer versus a human observer) than the letters in Bookman regular under visual noise. Here we examined whether the effect of bold emphasis can be generalized to a common visual-word recognition task (lexical decision: “is the item a wo…
Simulating Images Seen by Patients with Inhomogeneous Sensitivity Losses
2012
PURPOSE We aim to simulate how colored images are perceived by subjects with local achromatic and chromatic contrast sensitivity losses in the visual field (VF). METHODS The spatiochromatic corresponding pair algorithm, introduced in a previous article (J Opt Soc Am (A) 2004;21:176-186), has been implemented with a linear model of the visual system. Spatial information is processed separately by the chromatic and achromatic mechanisms by means of a multiscale model, with sensors selective to frequency, orientation, and spatial position, whose mechanism-dependent relative weights change with the spatial location of the image. These weights have been obtained from perimetric data from a patie…
Treatment of cutaneous lupus erythematosus: current practice variations
2015
The treatment of cutaneous lupus erythematous (CLE) remains a challenge. Most of the therapeutic options used in CLE have not been tested in randomized controlled studies and to date no agent has been approved. Therefore, CLE treatment is mostly based on personal experience. To better characterize therapeutic habits among physicians treating CLE patients, a questionnaire-based study about various aspects of topical and systemic treatment for CLE has been performed. The questionnaire was distributed among CLE experts, mostly from Japan, the USA, and Europe. A total of 82 completed questionnaires were assessed. High-potent and potent corticosteroids as well as calcineurin inhibitors were the…
Primary site disease and recurrence location in ovarian cancer patients undergoing primary debulking surgery vs. interval debulking surgery
2020
Introduction: The natural history and patterns of ovarian cancer (OC) relapse are still unclear. Recurrent disease can be peritoneal, parenchymal, or nodal. This study aims to analyze the location and pattern of OC recurrence according to the primary site of disease and to the type of surgical approach used. Material and methods: All OC patients underwent primary debulking surgery (PDS) or interval debulking surgery (IDS), with 2014 FIGO stage III-IV, and with platinum-sensitive recurrence were included in the study. Primary disease location and site of recurrences were divided into peritoneal, parenchymal, and nodal, according to the presence of peritoneal carcinomatosis, parenchymal metas…