Suchergebnisse

El fenomen de la globalització que vivim actualment ha provocat canvis lingüístics molt importants a escala mundial. L'anglès ha esdevingut la llengua internacional, del poder econòmic i polític, i s'està convertint en la llengua de les classes socials altes i el jovent. Paral·lelament, però, les llengües regionals també estan experimentant una gran difusió, gràcies a les noves interaccions socials i al suport econòmic dels governs que les representen. Alhora, i com a resultat d'aquestes dues tendències, sorgeix el sentiment d'arrelament de les comunitats locals, que veuen la llengua local com a marca d'autenticitat que cal defensar davant del fenomen de la globalització i la regionalització. Ens dirigim, doncs, cap a una societat multilingüe, en què cada llengua ha de tenir les seves pròpies funcions socials distintives, encara que sigui inevitable que es generin conflictes entre les llengües en contacte. En vista d'aquesta situació, l'autor anticipa una pèrdua de l'hegemonia de l'anglès a favor de l'augment de les llengües regionals i una futura extinció de les llengües més minoritàries. ; The globalisation phenomenon that we are currently seeing has lead to major linguistic changes on a worldwide scale. English has become the leading international language, in economic and political spheres, and is becoming the language of high society and of the young. At the same time, however, regional languages are also making considerable headway, thanks to new social interaction and economic backing from their governments. In turn, and as a result of these two trends, there is impetus for feelings of belonging to local communities which see their language as a sign of their own authenticity, one that has to be defended against the phenomena of globalisation and regionalisation. We are thus heading towards a multilingual society, in which each language has its own, distinct social functions, even though it is inevitable that there will be conflict between the languages that come into contact. In this scenario, the author predicts a loss of hegemony for English, in favour of regional languages, and the future extinction of the least spoken minority languages. ; El fenómeno de la globalización que vivimos actualmente ha provocado cambios lingüísticos muy importantes a escala mundial. El inglés se ha convertido en la lengua internacional, del poder económico y político, y se está convirtiendo en la lengua de las clases sociales altas y la juventud. Paralelamente, sin embargo, las lenguas regionales también están experimentado una gran difusión, gracias a las nuevas interacciones sociales y al apoyo económico de los gobiernos que las representan. A su vez, y como resultado de estas dos tendencias, surge el sentimiento de arraigo de las comunidades locales, que ven la lengua local como signo de autenticidad que hay que defender frente al fenómeno de la globalización y de la regionalización. Nos dirigimos, pues, hacia una sociedad multilingüe, en que cada lengua debe tener sus propias funciones sociales distintivas, aunque sea inevitable que se generen conflictos entre las lenguas en contacto. Ante esta situación, el autor anticipa una pérdida de la hegemonía del inglés a favor del aumento de les lenguas regionales y una futura extinción de las lenguas más minoritarias.

This thesis is focused on temporal information processing, which is a task framed in the field of natural language processing. The aim of this task is to obtain the temporal location and ordering of the events expressed in text or discourse, which requires the automatic interpretation of temporal expressions, events, and the temporal relations between them. The majority of current approaches are based on morphosyntactic knowledge. However, temporal entities are often ambiguous at that language analysis level. Our hypothesis is that the linguistic expression of time is a semantic phenomenon and therefore, to achieve a better extraction performance, temporal information must be processed using semantics. To prove this hypothesis, we present a semantic approach to temporal information processing: TIPSem. This is an automated system that includes features based on lexical semantics, semantic roles, and temporal semantics, in addition to morphosyntactic features. TIPSem has been empirically evaluated through the participation in the TempEval-2 international evaluation exercise and subsequent experiments based on this test. The results obtained firmly support the presented hypothesis and their analysis demonstrates that semantic features aid in handling morphosyntactic ambiguity and favour generalization capabilities. These conclusions have been reached for different languages (i.e., English, Spanish, Italian, and Chinese), which supports the defended hypothesis at a multilingual level. Finally, as compared with the state of the art, TIPSem obtains a very competitive performance level and introduces a remarkable improvement in event processing. TIPSem has been applied to the problem of graphical representation of temporal information. We have developed a dynamic interface which brings users time-based access to information: Time-Surfer. The results obtained through a user-oriented evaluation of this interface demonstrate that TIPSem's performance is also satisfactory from an extrinsic standpoint. ; This PhD thesis has been supported by the Spanish Government, in projects: TIN-2006-15265-C06-01, TIN-2009-13391-C04-01 and PROMETEO/2009/119, where Hector Llorens is funded under a FPI grant (BES-2007-16256).