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O uso de informações semânticas do PALAVRAS : em busca do aprimoramento da seleção de unidades textuais correferentes na sumarização automática
(Universidade Federal de São Carlos, 2010-06-21) Tomazela, Élen Cátia; Rino, Lúcia Helena Machado; https://lattes.cnpq.br/0315640846525832; https://lattes.cnpq.br/5260837297000438
This dissertation aims at presenting a theoretical heuristic model which not only takes into consideration the Veins Theory, but also semantic information obtained from the Parser PALAVRAS to improve the selection of correferential textual units to be included in automatic summaries. Based on the analysis of the problems presented by VeinSum, an automatic summarizer, two main issues have been raised: the necessity of improving its summaries salience and reducing their size so that they suit the compression rate more adequately. Better results can be achieved through the elimination of irrelevant textual units although the summaries referential clarity may not be damaged. Heuristics based on the semantic information have then been proposed. Despite the semantic annotation inconsistencies, all the noun phrases that compose the Summ-it Corpus have been post-edited manually, which increases the credibility of the heuristics. Eleven texts from the corpus have been analysed and the results obtained are satisfactory, although a wider study would be required to better evaluate the results of this proposal.
WOntoVLab: um processo para autoria de laboratórios virtuais baseado em workflows e ontologias
(Universidade Federal de São Carlos, 2010-06-21) Cugler, Daniel Cintra; Santos, Marilde Terezinha Prado; https://lattes.cnpq.br/9826026025118073; https://lattes.cnpq.br/6695618899739556
Virtual laboratories can be used by educational institutions to facilitate and enrich the learning of specific procedures, however they can be also used by industry in demonstrations, tests and trainings. Laboratorial practices are normally performed in physical laboratories, but sometimes it is necessary to afford a great amount of money to acquire apparatuses and physical space to build them. In this context, virtual laboratories have been used as a solution at less cost to provide environments that support the simulation of experiments in computers. However, in order to provide such an environment, it is recommended that users not only create experiments that require the accomplishment of a protocol (guide), but also be able to identify different possibilities of execution of a same task, considering similar apparatuses and procedures. In this context, it is defined in this research the WOntoVLab, a virtual laboratory authorship process based on workflows and ontologies that performs recommendations of apparatuses in the authorship process and also represents experiment protocols based on semantic vocabulary and alternative steps. It is also detailed a estudy case performed in the molecular biology domain, focused in the DNA extraction experiment. The study case is performed using the virtual laboratory prototype developed, which is totally based in the WOntoVLab process. Lastly, it is mentioned the contributions of this research: the WOntoVLab process, WPF framework and WPF-WS framework.
Hipoelipticidade global de campos vetoriais no toro TN
(Universidade Federal de São Carlos, 2010-06-21) Nascimento, Moisés Aparecido do; Santos, Luís Antônio Carvalho dos; https://lattes.cnpq.br/5936461714940890
In this work, we will see that if the transpose operator of a smooth real vector field L defined on the N-dimensional torus, regarded as a linear differential operator with coefficients in C1(TN), is globally hypoelliptic, then there exists a vector field with constant coefficients L0 such that L and L0 are C1-conjugated, with such constants satisfying a condition called Diofantina (*). We will also show the converse of this fact, that is, if there is a coordinate system such that in this new system L has constant coefficients with such constant satisfying the Diophantine condition (*) then its transpose L* is globally hypoelliptic. We will see that the Diophantine condition implies that the flow generated by the field, regarded as a Dynamical system is minimal.