Search results for " Semantic"
showing 10 items of 271 documents
Feature Dimensionality Reduction for Mammographic Report Classification
2016
The amount and the variety of available medical data coming from multiple and heterogeneous sources can inhibit analysis, manual interpretation, and use of simple data management applications. In this paper a deep overview of the principal algorithms for dimensionality reduction is carried out; moreover, the most effective techniques are applied on a dataset composed of 4461 mammographic reports is presented. The most useful medical terms are converted and represented using a TF-IDF matrix, in order to enable data mining and retrieval tasks. A series of query have been performed on the raw matrix and on the same matrix after the dimensionality reduction obtained using the most useful techni…
Object-Oriented Operational Semantics
2016
Operational semantics is one way of providing meaning to an executable language. On a high level of abstraction, operational semantics means to define an interpreter or an abstract machine for the language. In this article, we review the concept of operational semantics in the scope of meta-model-based language definitions and identify challenges and issues. We provide a clean conceptual approach using an object-oriented runtime environment and state change operations, which relies on an underlying abstract virtual machine. We present the approach using a sample language.
Geometric Algebra Rotors for Sub-symbolic Coding of Natural Language Sentences
2007
A sub-symbolic encoding methodology for natural language sentences is presented. The procedure is based on the creation of an LSA-inspired semantic space and associates rotation operators derived from Geometric Algebra to word bigrams of the sentence. The operators are subsequently applied to an orthonormal standard basis of the created semantic space according to the order in which words appear in the sentence. The final rotated basis is then coded as a vector and its orthogonal part constitutes the sub-symbolic coding of the sentence. Preliminary experimental results for a classification task, compared with the traditional LSA methodology, show the effectiveness of the approach.
Sub-symbolic Encoding of Words
2003
A new methodology for sub-symbolic semantic encoding of words is presented. The methodology uses the WordNet lexical database and an ad hoc modified Sammon algorithm to associate a vector to each word in a semantic n-space. All words have been grouped according to the WordNet lexicographers’ files classification criteria: these groups have been called lexical sets. The word vector is composed by two parts: the first one, takes into account the belonging of the word to one of these lexical sets; the second one is related to the meaning of the word and it is responsible for distinguishing the word among the other ones of the same lexical set. The application of the proposed technique over all…
Semantic Agent Programming Language (S-APL): A Middleware Platform for the Semantic Web
2008
The agent-based approach is an effective one for building middleware interconnecting distributed heterogeneous resources and providing semantic interoperability among them. On the other hand, agents need the semantic Web technologies for flexible yet effective coordination among them with a particular issue of enabling agents to communicate not only about the domain but also about their own abilities, goals, and present and intended actions. This paper describes semantic agent programming language (SAPL)intended to be a core middleware language for the semantic Web. S-APL integrates the semantic description of the domain resources with the semantic prescription of the agents' behaviors. Add…
A Formal Semantics and a Client Synthesis for a BPEL Service
2008
A complex Web service described with languages like BPEL4WS, consists of an executable process and its observable behaviour (called an abstract process) based on the messages exchanged with the client. The abstract process behaviour is non deterministic due to the internal choices during the service execution. Furthermore the specification often includes timing constraints which must be taken into account by the client. Thus given a service specification, we identify the synthesis of a client as a key issue for the development of Web services. To this end, we propose an approach based on (dense) timed automata to first describe the observable service behaviour and then to build correct inte…
Desarrollo y evaluación psicométrica de una forma abreviada de la escala de posicionamiento ante el diagnóstico enfermero
2013
El Position on Nursing Diagnosis (PND) es una escala que utiliza la técnica del diferencial semántico para medir las actitudes hacia el concepto diagnóstico enfermero. El estudio objetivó desarrollar una forma abreviada de la versión española de esta escala, evaluar sus propiedades psicométricas y eficiencia. Se utilizó un doble enfoque empírico-teórico para obtener una forma reducida del PND, el PND-7-SV, que fuera equivalente a la original. Mediante un diseño transversal a través de encuesta, se evaluó la fiabilidad (consistencia interna y fiabilidad test-retest), validez de constructo (análisis factorial exploratorio, técnica de grupos conocidos y validez discriminante) y de criterio (va…
Sémantique discursive cognitive.
2022
Langue et connaissances sont dans la recherche actuelle travaillées sous l’angle du discours. Son étude linguistique permet d’identifier des figements en tant qu’expressions de routines sociales et cognitives. Cette approche exploite deux outils : les constructions en tant qu’appariements de sens et de forme, et les frames en tant qu’unités minimales de connaissances partagées. Il convient alors de construire théoriquement cette association, encore inédite en analyse du discours. Un protocole méthodologique de linguistique du corpus opérationnalise l’approche développée. Puis, une analyse empirique d’un corpus de publicités du vin issues de prospectus de supermarchés autrichiens permet de v…
How domain-sensitive are existential constructions? Evidence from Swedish and Dutch weather reports
2020
International audience; [Introduction] Over the last two decades, linguists have shown considerable interest in the advantages of CxG-theories for various linguistic sub-disciplines. A particular question that has arisen within more “applied” frameworks, is whether or not constructions can have domain-specific manifestations regarding meaning and/or form (Fischer/Nikiforidou 2015; Bücker/Günther/Imo 2015; Gautier/Bach 2019). However, sufficient empirical analyses are currently missing, and this research question needs to be more systematically tested for constructions in various languages and different LSP-oriented domains. Beside the mere “applied” focus, such work can lead to interestin…
Tra norme e convenzioni. Ipotesi sul senso letterale
2015
La nozione di signifcato letterale è al centro di un dibattito che coinvolge fgure disciplinari eterogenee: teorici del diritto, studiosi di semiotica e flosof del linguaggio sono tra i principali protagonisti di un continuo lavoro di revisione teorica che ha come oggetto d’indagine questa nozione. I lavori di François Récanati, tra cui le ricerche confuite nel fondamentale Literal Meaning (2004), hanno contribuito ad accrescere e valorizzare l’importanza di molte questioni correlate. Il rapporto tra signifcato letterale e convenzioni è divenuto, in particolare, una tappa di rifessione obbligata: è frequente, infatti, presentare i signifcati letterali come signifcati stabilmente convenziona…