947 resultados para lexical semantic


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La causalité est une des notions les plus fondamentales de la vie humaine. La vulgarisation scientifique se base sur l’établissement fréquent de relations causales par le truchement d'indices linguistiques. Ainsi, la causalité y est perceptible à l'aide de marques explicites, se manifestant au niveau lexical. Dans de nombreuses situations, afin de valider la relation causale, il faut récupérer des termes plus ou moins explicites qui apparaissent au niveau morphosyntaxique. Viennent enfin les procédés implicites d’expression de la cause ou "la causalité non marquée" linguistiquement.  

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The purpose of this paper is to identify problems when translating standard formulas of expression in English to Spanish legal translation. To achieve the goal, a total of 250 Spanish translations were analyzed of 10 sentences from legal texts in English. The degree of difficulty posed by the translation of these formulas is confirmed by the results obtained, which is related not so much to the intrinsic meaning of the words that compose them, but to their contextual meaning. An eclectic approach that combines discourse analysis with contrastive linguistics is proposed, and some specific didactic guidelines are indicated to facilitate the translation teaching of these standard formulas of expression. Lexical interpretation and contextual recreation allow the apprentice translator to make progress with the translation of these phrases and to improve his/her attitude when facing them to achieve a successful semantic and contextual interpretation, that is to say, getting the closest natural equivalent while respecting the genius of the language.

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One of the leading motivations behind the multilingual semantic web is to make resources accessible digitally in an online global multilingual context. Consequently, it is fundamental for knowledge bases to find a way to manage multilingualism and thus be equipped with those procedures for its conceptual modelling. In this context, the goal of this paper is to discuss how common-sense knowledge and cultural knowledge are modelled in a multilingual framework. More particularly, multilingualism and conceptual modelling are dealt with from the perspective of FunGramKB, a lexico-conceptual knowledge base for natural language understanding. This project argues for a clear division between the lexical and the conceptual dimensions of knowledge. Moreover, the conceptual layer is organized into three modules, which result from a strong commitment towards capturing semantic knowledge (Ontology), procedural knowledge (Cognicon) and episodic knowledge (Onomasticon). Cultural mismatches are discussed and formally represented at the three conceptual levels of FunGramKB.

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This paper is a study about the way in which se structures are represented in 20 verb entries of nine dictionaries of Spanish language. There is a large number of these structures and they are problematic for native and non native speakers. Verbs of the analysis are middle-high frequency and, in the most part of the cases, very polysemous, and this allows to observe interconnections between the different se structures and the different meanings of each verb. Data of the lexicographic analysis are cross-checked with corpus analysis of the same units. As a result, it is observed that there is a large variety in the data which are offered in each dictionary and in the way they are offered, inter and intradictionary. The reasons range from the theoretical overall of each Project to practical performance. This leads to the conclusion that it is necessary to further progress in the dictionary model it is being handled, in order to offer lexico-grammatical phenomenon such as se verbs in an accurate, clear and exhaustive way.

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From ecological tourism to ecotourism: lexical analysis of an emerging tourism. This article deals with the lexicon created in connection with a recent form of tourism: the ecological tourism or ecotourism. The rise of this type of tourism encourages the creation of new concepts and products that are named with new words and expressions with different procedures of formation. From the name itself ecotourism, then expressed as the acronym ecotourism, we analyze the formation of other related words, as well as their formal variation and use. For this, we have worked with a specific corpus of electronic tourist texts and different digital sources and databases.

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In this paper we introduce the online version of our ReaderBench framework, which includes multi-lingual comprehension-centered web services designed to address a wide range of individual and collaborative learning scenarios, as follows. First, students can be engaged in reading a course material, then eliciting their understanding of it; the reading strategies component provides an in-depth perspective of comprehension processes. Second, students can write an essay or a summary; the automated essay grading component provides them access to more than 200 textual complexity indices covering lexical, syntax, semantics and discourse structure measurements. Third, students can start discussing in a chat or a forum; the Computer Supported Collaborative Learning (CSCL) component provides indepth conversation analysis in terms of evaluating each member’s involvement in the CSCL environments. Eventually, the sentiment analysis, as well as the semantic models and topic mining components enable a clearer perspective in terms of learner’s points of view and of underlying interests.

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The Semantic Annotation component is a software application that provides support for automated text classification, a process grounded in a cohesion-centered representation of discourse that facilitates topic extraction. The component enables the semantic meta-annotation of text resources, including automated classification, thus facilitating information retrieval within the RAGE ecosystem. It is available in the ReaderBench framework (http://readerbench.com/) which integrates advanced Natural Language Processing (NLP) techniques. The component makes use of Cohesion Network Analysis (CNA) in order to ensure an in-depth representation of discourse, useful for mining keywords and performing automated text categorization. Our component automatically classifies documents into the categories provided by the ACM Computing Classification System (http://dl.acm.org/ccs_flat.cfm), but also into the categories from a high level serious games categorization provisionally developed by RAGE. English and French languages are already covered by the provided web service, whereas the entire framework can be extended in order to support additional languages.

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This paper introduces a novel, in-depth approach of analyzing the differences in writing style between two famous Romanian orators, based on automated textual complexity indices for Romanian language. The considered authors are: (a) Mihai Eminescu, Romania’s national poet and a remarkable journalist of his time, and (b) Ion C. Brătianu, one of the most important Romanian politicians from the middle of the 18th century. Both orators have a common journalistic interest consisting in their desire to spread the word about political issues in Romania via the printing press, the most important public voice at that time. In addition, both authors exhibit writing style particularities, and our aim is to explore these differences through our ReaderBench framework that computes a wide range of lexical and semantic textual complexity indices for Romanian and other languages. The used corpus contains two collections of speeches for each orator that cover the period 1857–1880. The results of this study highlight the lexical and cohesive textual complexity indices that reflect very well the differences in writing style, measures relying on Latent Semantic Analysis (LSA) and Latent Dirichlet Allocation (LDA) semantic models.

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Objective
Pedestrian detection under video surveillance systems has always been a hot topic in computer vision research. These systems are widely used in train stations, airports, large commercial plazas, and other public places. However, pedestrian detection remains difficult because of complex backgrounds. Given its development in recent years, the visual attention mechanism has attracted increasing attention in object detection and tracking research, and previous studies have achieved substantial progress and breakthroughs. We propose a novel pedestrian detection method based on the semantic features under the visual attention mechanism.
Method
The proposed semantic feature-based visual attention model is a spatial-temporal model that consists of two parts: the static visual attention model and the motion visual attention model. The static visual attention model in the spatial domain is constructed by combining bottom-up with top-down attention guidance. Based on the characteristics of pedestrians, the bottom-up visual attention model of Itti is improved by intensifying the orientation vectors of elementary visual features to make the visual saliency map suitable for pedestrian detection. In terms of pedestrian attributes, skin color is selected as a semantic feature for pedestrian detection. The regional and Gaussian models are adopted to construct the skin color model. Skin feature-based visual attention guidance is then proposed to complete the top-down process. The bottom-up and top-down visual attentions are linearly combined using the proper weights obtained from experiments to construct the static visual attention model in the spatial domain. The spatial-temporal visual attention model is then constructed via the motion features in the temporal domain. Based on the static visual attention model in the spatial domain, the frame difference method is combined with optical flowing to detect motion vectors. Filtering is applied to process the field of motion vectors. The saliency of motion vectors can be evaluated via motion entropy to make the selected motion feature more suitable for the spatial-temporal visual attention model.
Result
Standard datasets and practical videos are selected for the experiments. The experiments are performed on a MATLAB R2012a platform. The experimental results show that our spatial-temporal visual attention model demonstrates favorable robustness under various scenes, including indoor train station surveillance videos and outdoor scenes with swaying leaves. Our proposed model outperforms the visual attention model of Itti, the graph-based visual saliency model, the phase spectrum of quaternion Fourier transform model, and the motion channel model of Liu in terms of pedestrian detection. The proposed model achieves a 93% accuracy rate on the test video.
Conclusion
This paper proposes a novel pedestrian method based on the visual attention mechanism. A spatial-temporal visual attention model that uses low-level and semantic features is proposed to calculate the saliency map. Based on this model, the pedestrian targets can be detected through focus of attention shifts. The experimental results verify the effectiveness of the proposed attention model for detecting pedestrians.

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This paper describes part of an ongoing effort to improve the readability of Swedish electronic health records (EHRs). An EHR contains systematic documentation of a single patient’s medical history across time, entered by healthcare professionals with the purpose of enabling safe and informed care. Linguistically, medical records exemplify a highly specialised domain, which can be superficially characterised as having telegraphic sentences involving displaced or missing words, abundant abbreviations, spelling variations including misspellings, and terminology. We report results on lexical simplification of Swedish EHRs, by which we mean detecting the unknown, out-ofdictionary words and trying to resolve them either as compounded known words, abbreviations or misspellings.

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Stimuli that cannot be perceived (i.e., that are subliminal) can still elicit neural responses in an observer, but can such stimuli influence behavior and higher-order cognition? Empirical evidence for such effects has periodically been accepted and rejected over the last six decades. Today, many psychologists seem to consider such effects well-established and recent studies have extended the power of subliminal processing to new limits. In this thesis, I examine whether this shift in zeitgeist is matched by a shift in evidential strength for the phenomenon. This thesis consists of three empirical studies involving more than 250 participants, a simulation study, and a quantitative review. The conclusion based on these efforts is that several methodological, statistical, and theoretical issues remain in studies of subliminal processing. These issues mean that claimed subliminal effects might be caused by occasional or weak percepts (given the experimenters’ own definitions of perception) and that it is still unclear what evidence there is for the cognitive processing of subliminal stimuli. New data are presented suggesting that even in conditions traditionally claimed as “subliminal”, occasional or weak percepts may in fact influence cognitive processing more strongly than do the physical stimuli, possibly leading to reversed priming effects. I also summarize and provide methodological, statistical, and theoretical recommendations that could benefit future research aspiring to provide solid evidence for subliminal cognitive processing.

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El trabajo releva la presencia de las universidades argentinas en la prensa de alcance nacional. Sistematizaremos la mención de ellas en la versión digital de los diarios para observar frecuencia de aparición y contenidos que se asocian. Partimos de la hipótesis de que los medios hegemónicos sólo registran los eventos de universidades del “interior del país” cuando se vinculan con hechos curiosos o violentos. Interesa indagar en qué casos particulares la referencia a dichas universidades se vincula con la producción y difusión académica del conocimiento científico, entre otras. Constituimos el corpus con fragmentos de textos periodísticos que permiten examinar estructuras gramaticales para develar las representaciones que la prensa naturaliza a través de esas formas. Seguimos consideraciones teórico-metodológicas de la Lingüística Crítica sobre el nivel sintáctico: cuando aparece una distorsión en la estructura superficial existe una manipulación ideológica del sentido. Incluimos parte de la teoría de las transformaciones: en el relato de un acontecimiento, cualquier alteración del esquema causa-consecuencia construye una ideología por la cual percibimos los hechos de otra manera. Asimismo, para establecer correlaciones semánticas en lo discursivo, analizaremos los términos en función de tipos de significado y valor eufórico/disfórico de la base léxica. Por otra parte, desde la Teoría de la Enunciación, distinguiremos palabras objetivas y subjetivas: los hechos enunciativos están constituidos por las huellas lingüísticas de la presencia del locutor en su enunciado, denominadas subjetivemas. Además de los pronombres, rasgos espaciales y temporales como marcas enunciativas, seleccionaremos unidades léxicas como sustantivos, adjetivos, verbos y adverbios. La existencia de los subjetivemas se fundamenta en que toda unidad léxica implica una interpretación del mundo, esto es, una ideología en el sentido que asumimos en nuestro trabajo desde el Análisis Crítico del Discurso. Como complemento de las perspectivas interpretativas mencionadas, realizaremos la cuantificación previa de referencias mediante el Análisis de Contenido como apoyo metodológico. A tal fin, el estudio prevé la utilización de una herramienta tecnológica diseñada ad hoc, para el conteo de frecuencia, relevamiento de contextos lingüísticos de aparición y asociaciones léxicas en la frase, como sistematización previa al trabajo cualitativo de valoración de estructuras léxico-semánticas y morfo-sintácticas. The research reflects the presence of Argentine universities in nationwide media. We will systematize their mention on online version of La Nación and Clarín newspapers to observe their frequency of appearance and the contents they are related to. With the hypothesis that hegemonic media only register events in universities from inside the country when they are related to curious or violent events, we will investigate in which particular cases the reference to such universities is related to the production and academic diffusion of scientific knowledge. We built up the corpus with fragments from articles which allow us to examine the deep grammatical structures to reveal the representation press naturalizes through these forms. We follow theoretical-methodological considerations of Critical Linguistics (CL) about the syntactical level: when a distortion in the superficial structure appears, there exists an ideological manipulation of meaning. Also, to establish semantic correlations on the discursive field, we will analyze terms as regards types of meaning and euphoric/disphoric value of lexical basis. From the Theory of Enunciation, we will distinguish between objective and subjective words (“subjectivemes”): lexical unit implies an interpretation of the world, that is, an ideology in the way we assume in our work from Critical Discourse Analysis (CDA). As a complement to CL and CDA, we will carry out a previous quantification using a technological tool designed ad hoc.

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La presente ricerca tratta lo studio delle basi di conoscenza, volto a facilitare la raccolta, l'organizzazione e la distribuzione della conoscenza. La scelta dell’oggetto è dovuta all'importanza sempre maggiore acquisita da questo ambito di ricerca e all'innovazione che esso è in grado di apportare nel campo del Web semantico. Viene analizzata la base di conoscenza YAGO: se ne descrivono lo stato dell’arte, le applicazioni e i progetti per sviluppi futuri. Il lavoro è stato condotto esaminando le pubblicazioni relative al tema e rappresenta una risorsa in lingua italiana sull'argomento.

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Le genre des emprunts lexicaux référant à des entités non-sexuées en français est parfois considéré comme arbitraire, alors qu’il est parfois vu comme motivé par sa forme physique et/ou ses significations. Puisque les avis diffèrent à ce sujet, nous nous sommes intéressé à analyser de nombreux critères pouvant contribuer à l’attribution du genre d’un emprunt. Nous avons constitué quatre corpus, chacun composé de textes issus d’une communauté linguistique emprunteuse (Québec et Europe) et d’un niveau de formalité (formel ou informel). Nous avons observé que le genre des emprunts varie considérablement dans de nombreux cas. Nous constatons que les emprunts des langues à genre (italien, arabe) conservent généralement leur genre originel. Les critères sémantiques et de forme physique peuvent autant justifier le genre d’un emprunt l’un que l’autre. Le critère sémantique le plus opératoire intègre chaque emprunt dans un paradigme conceptuel regroupant plusieurs unités lexicales sous une même conceptualisation et, généralement, un genre commun au paradigme.

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En este trabajo nos proponemos analizar la colocación latina poena afficere, ‘imponer un castigo’, un tipo de colocación con especificidades tanto sintácticas como semánticas que la distinguen de las construcciones verbo-nominales más prototípicas: el sustantivo predicativo funciona no como Objeto Directo sino como tercer argumento del verbo soporte, un esquema sintáctico que, como intentaremos demostrar, resulta ideal para la expresión de predicados causativos. De los ejemplos documentados de poena afficere en un amplio corpus de textos, intentaremos destacar las principales características de este tipo de colocación. Para su descripción y formalización nos serviremos del marco teórico propuesto por la Teoría Sentido-Texto.