Search results for " Patterns"
showing 10 items of 454 documents
Some properties and applications of local second-order characteristics for spatio-temporal point processes on networks
2021
Point processes on linear networks are increasingly being considered to analyse events occurring on particular network-based structures. In this work, we extend Local Indicators of Spatio-Temporal Association (LISTA) functions to the non-Euclidean space of linear networks, allowing to obtain information on how events relate to nearby events. In particular, we propose the local version of two inhomogeneous second-order statistics for spatio-temporal point processes on linear networks, the K- and the pair correlation functions. We also show that these LISTA functions are useful for diagnostics of models specified on the networks, and can be helpful to assess the goodness-of-fit of different s…
From Adjectives to Quantifiers. Evidence from Old and Modern Catalan
2011
La història dels quantificadors indefinits de les llengües romàniques és la història del desenvolupament de nous trets distribucionals per un grup escollit d’adjectius llatins (Company 1991, 1997; Batllori 1998). Aquesta distribució serà responsable de la constitució posterior de la nova subclasse de determinants que anomenem quantificadors. Com s’explica a Zamparelli (2000), l’augment de la complexitat estructural del marge esquerre del SDet suposa l’especialització de paraules que pertanyien a antigues categories per aquestes noves posicions. És així com la posició de quantificador genera la categoria quantificador. Estem devant un procés de llarga durada amb conseqüències que encara són …
The role of implicit theories in the non-expert translation process
2014
Research into the role of implicit theories in decision-making covers a broad area ranging from personal to political relationships, and from private to professional life. To date, translation studies have paid little attention to the influence of translators’ knowledge and beliefs in the translation process, and even less to the role of implicit theories. In a pilot study with translation trainees, we attempted to reconstruct their theories about translation and discern to what extent these theories influence both the translation process and the translated text. Our results so far show that trainees do entertain initial implicit theories, which can be modified through experience and formal…
Surveillance Program for Diagnosis of HCC in Liver Cirrhosis: Role of Ultrasound Echo Patterns
2017
International guidelines suggest ultrasound surveillance for hepatocellular carcinoma (HCC) early diagnosis in liver cirrhosis (LC) patients, but 40% of nodules <2 cm escape detection. We investigated the existence of an ultrasound pattern indicating a higher risk of developing HCC in patients under surveillance. 359 patients with LC (Child-Pugh A-B8) underwent ultrasound screening (median follow-up 54 months, range 12–90 months), liver function tests, alpha-fetoprotein assay, and portal hypertension evaluation. Echo patterns were homogeneous, bright liver, coarse, coarse small nodular pattern, and coarse large nodular pattern. During follow-up 13.9% developed HCC. At multivariate analys…
Cirrhosis: CT and MR imaging evaluation
2006
In this article, we present the CT and MR imaging characteristics of the cirrhotic liver. We describe the altered liver morphology in different forms of viral, alcoholic and autoimmune end-stage liver disease. We present the spectrum of imaging findings in portal hypertension, such as splenomegaly, ascites and varices. We describe the patchy and lacelike patterns of fibrosis, along with the focal confluent form. The process of hepatocarcinogenesis is detailed, from regenerative to dysplastic nodules to overt hepatocellular carcinoma. Different types of non-neoplastic focal liver lesions occurring in the cirrhotic liver are discussed, including arterially enhancing nodules, hemangiomas and p…
Management of hepatic encephalopathy in Germany: a survey among physicians
2020
Hepatic encephalopathy (HE) is a severe complication of liver cirrhosis with impairment of quality of life and prognosis. Management patterns among physicians have not been investigated yet. A questionnaire containing 17 questions was sent out to 1468 gastroenterologists and 120 general practitioners (GPs). It included questions regarding diagnostic, therapeutic, and management strategies used in patients with overt HE (OHE) and covert HE (CHE). The response rate was 12 % (n = 172) for gastroenterologists and 45 % (n = 54) for GPs. Of gastroenterologists, 26.7 % examine patients with an initial diagnosis of liver cirrhosis regarding HE. Gastroenterologists favored a combination of differen…
Video-Based Depression Detection Using Local Curvelet Binary Patterns in Pairwise Orthogonal Planes
2016
International audience; Depression is an increasingly prevalent mood disorder. This is the reason why the field of computer-based depression assessment has been gaining the attention of the research community during the past couple of years. The present work proposes two algorithms for depression detection, one Frame-based and the second Video-based, both employing Curvelet transform and Local Binary Patterns. The main advantage of these methods is that they have significantly lower computational requirements, as the extracted features are of very low dimensionality. This is achieved by modifying the previously proposed algorithm which considers Three-Orthogonal-Planes, to only Pairwise-Ort…
Dynamic best spectral bands selection for face recognition
2014
In this paper, face recognition in uncontrolled illumination conditions is investigated. A twofold contribution is proposed. First, three state-of-art algorithms, namely Multiblock Local Binary Pattern (MBLBP), Histogram of Gabor Phase Patterns (HGPP) and Local Gabor Binary Pattern Histogram Sequence (LGBPHS) are evaluated upon the IRIS-M3 face database to study their robustness against a high illumination variation conditions. Second, we propose to use visible multispectral images, provided by the same face database, to enhance the performance of the three mentioned algorithms. To reduce the high data dimensionality introduced by the use of multispectral images, we have designed a system t…
A New Wavelet-Based Texture Descriptor for Image Retrieval
2007
This paper presents a novel texture descriptor based on the wavelet transform. First, we will consider vertical and horizontal coefficients at the same position as the components of a bivariate random vector. The magnitud and angle of these vectors are computed and its histograms are analyzed. This empirical magnitud histogram is modelled by using a gamma distribution (pdf). As a result, the feature extraction step consists of estimating the gamma parameters using the maxima likelihood estimator and computing the circular histograms of angles. The similarity measurement step is done by means of the well-known Kullback-Leibler divergence. Finally, retrieval experiments are done using the Bro…
Large-scale long-term passive-acoustic monitoring reveals spatio-temporal activity patterns of boreal bats
2023
The distribution ranges and spatio-temporal patterns in the occurrence and activity of boreal bats are yet largely unknown due to their cryptic lifestyle and lack of suitable and efficient study methods. We approached the issue by establishing a permanent passive-acoustic sampling setup spanning the area of Finland to gain an understanding on how latitude affects bat species composition and activity patterns in northern Europe. The recorded bat calls were semi-automatically identified for three target taxa; Myotis spp., Eptesicus nilssonii or Pipistrellus nathusii and the seasonal activity patterns were modeled for each taxa across the seven sampling years (2015–2021). We found an increase …