Dynamic Data Structures for Timed Automata Acceptance.

We study a variant of the classical membership problem in automata theory, which consists of deciding whether a given input word is accepted by a given automaton. We do so through the lenses of parameterized dynamic data structures: we assume that the automaton is fixed and its size is the parameter, while the input word is revealed as in a stream, one symbol at a time following the natural order on positions. The goal is to design a dynamic data structure that can be efficiently updated upon revealing the next symbol, while maintaining the answer to the query on whether the word consisting of symbols revealed so far is accepted by the automaton. We provide complexity bounds for this dynamic acceptance problem for timed automata that process symbols interleaved with time spans. The main contribution is a dynamic data structure that maintains acceptance of a fixed one-clock timed automaton  A with amortized update time  2 O ( | A | ) per input symbol.

Una causa olvidada de insuficiencia cardíaca / A forgotten cause of heart failure

Amyloidosis is a low-frequency disease that can cause compromise of different systems. We report a case of heart failure in an 81-year-old woman secondary to amyloidosis, in which the echocardiogram was a valuable diagnostic tool.

Evaluación clínica e imagenológica de dos técnicas de preservación de reborde alveolar post exodoncia / Clinical assessment and imaging of two preservation techniques of alveolar ridge post exodontia

Ninguna técnica de preservación alveolar ha logrado conservar totalmente las dimensiones iniciales del reborde, luego de la extracción dentaria. Se ha reportado falta de evidencia científica y de estudios prospectivos que utilicen los alvéolos post exodoncia como control. El objetivo de este estudio fue comparar clínica e imagenológicamente las variaciones dimensionales del reborde óseo utilizando diferentes técnicas de preservación alveolar en un periodo de 6 a 8 semanas post exodoncia. Se recolectaron 10 pacientes con indicación de exodoncia de cuatro premolares por indicación de ortodoncia, usando un diseño de maxilares divididos. Un lado experimental (dos alvéolos) y el otro lado como control (dos alvéolos). Se observó que existieron diferencias significativas (p<0,05) de reabsorción ósea entre el grupo experimental superior con el grupo control superior. El 33,3% se los alvéolos experimentales presentaron algún tipo de exposición de membrana oclusiva, siendo la más frecuente la Matriz Dérmica Acelular (50%). La técnica de exodoncia mínimamente traumática es la forma más simple y económica de preservar el reborde alveolar. No fue posible determinar cuál técnica es más eficiente para conservar las dimensiones del reborde alveolar.

No ridge preservation technique has achieved to fully sustain the initial dimensions of the alveolar bone at the moment of tooth extraction. Lack of scientific evidence and prospective studies that use the alveolus as control site have been reported. The aim of this study was to clinically and imagenologically compare the variation of the alveolar ridge dimensions, using different alveolar ridge preservation techniques in a period of 6 to 8 weeks post tooth extraction. Ten (10) patients with orthodontic tooth extraction indication of four premolars were collected, using a split mouth design. An experimental side (two sockets) and the other side as control (two sockets). There were significant differences of bone resorption between the superior experimental group and the superior control group. 33, 3% of the experimental alveolus showed some kind of barrier membrane exposure, being Acellular Dermal Matrix (ADM) the most frequent (50%). The atraumatic extraction technique is the most simple and economic way of preserving the alveolar ridge. It was not possible to determine which technique is the most efficient to conserve la alveolar ridge dimensions.