When integrating data from multiple Web sources, objects can exist in different formats and structures, making it difficult to identify those that can be matched together. In this paper, we propose an identification approach to finding similar identities among objects from multiple Web sources. In this approach, object identification works like the relational join operation where a similarity function takes the place of the equality condition. This similarity function is based on information retrieval techniques. Our approach differs from others in the literature since it can be used to identify objects more complexly structured (e.g., XML documents) and not only objects with a flat structure such as relations. The effectiveness of our approach is demonstrated by experimental results with real Web data sources from different domains, that reach precision levels above 75%.
RESuMoIntrodução: A reprodutibilidade da atividade eletromiográfica de superfície (EMG) é mais estudada em protocolos que envolvem contrações isométricas. Alguns fatores relacionados às contrações dinâmicas podem contribuir para a instabilidade do sinal mioelétrico e dificultar a reprodutibilidade da medida da EMG. Objetivo: Determinar a reprodutibilidade teste-reteste e quantificar o erro téc-nico da medida da frequência mediana (FM) e da amplitude (root mean square, RMS) da EMG, em contrações dinâmicas e estáticas. Métodos: Dez sujeitos foram testados em dois dias, sendo a atividade EMG registrada na maior porção do bíceps braquial. No primeiro dia foi feito o teste de uma repetição máxima (1RM) e de contração voluntária máxima (CVM). No segundo dia foram realizadas duas séries de 10 contrações dos flexores do cotovelo com 75% de 1RM, entremeadas por 1 h em repouso. Antes de cada série foi realizada uma CVM. Resultados: Para a FM e RMS foi observado alto coeficiente de correlação intraclasse para o sinal do bíceps braquial (CCI = 0,90-0,98 para a FM; CCI = 0,89-0,94 para o RMS) e de baixo para moderado coeficiente de variação (CV = 2,5-6,2% para a FM; CV = 14,6-16,3% para o RMS) em ambos os testes. Não foi observada diferença significativa entre teste e reteste (p > 0,05). Conclusão: A FM e o RMS apresentam alta confiabilidade e baixo a moderado erro em contrações estáticas e dinâmicas, possibilitando o uso da EMG para investigação da fadiga e de desordens neuromusculares.Descritores: músculo esquelético, fadiga muscular, análise espectral, eletromiografia. for RMS) and low to moderate coefficient of variation
Introduction: Reproducibility of electromyographic activity (EMG) is the most studied in protocols involving isometric contractions. Some factors related to dynamic contractions may contribute to the instability of the myoelectric signal and affect the reproducibility of the measurement of EMG. Objective: To determine the test-retest reproducibility and quantify the technical error of the measurement of the median frequency (MF) and amplitude (root mean square, RMS) of the surface EMG in static and dynamic contractions. Methods: Ten subjects were tested in two days with the EMG activity recorded for the greatest portion of the biceps brachii tendon. In the first day the subjects did one test of maximum repetition (1MR) and maximal voluntary contraction (MVC
Introduction and objective: Delta efficiency (DE) and oxygen uptake kinetics (K O 2 ) are influenced by muscle metabolic parameters and oxygen transport. The aim of this study was to determine the difference in DE and K O 2 in three effort intensities in both genders. Methods: Fifty-six subjects (26 women) were submitted to a graded maximal exercise test (GXT) on cycle ergometer to determine the maximum oxygen uptake ( O 2max ), maximal power output (W max ), anaerobic threshold (AT) and respiratory compensation point (RCP). The AT and RCP were determined using the V-slope and E / O 2 methods; the RCP using the relationship O 2 versus E both by two investigators. The DE and K O 2 have been considered as a slope between O 2 versus Watts and O 2 versus time (s), respectively, from the beginning of test until AT (S 1 ), from AT to RCP (S 2 ) and from RCP to O 2max (S 3 ), determined by linear regression analysis. Results: Regarding DE, significant differences were observed between S 1 versus S 2 (p = 0.001), S 1 versus S 3 (p = 0.001) and S 2 versus S 3 (p = 0.006). There was no significant difference (p = 0.060) or interaction (p = 0.062) between men and women. For K O 2 , significant differences were observed between S 1 versus S 3 (p = 0.001) and S 2 versus S 3 (p = 0.001) in both genders. Significant differences (p = 0.001) and interaction (p = 0.006) were observed between men and women, in the last parameter. Conclusions: DE decreases with increasing intensity of power output, but there are no differences when comparing men and women. On the other hand, women present faster K O 2 than men.
We evaluated the epidemiological, hematological, and pathological data of Leishmania spp., Toxoplasma gondii, Platynosomum illiciens, feline immunodeficiency virus (FIV), and feline leukemia virus (FeLV) infections and the coinfections in stray cats of an endemic area for leishmaniasis. The diagnosis was performed by serological tests and necropsy. We described gross lesions and histopathological findings. We used immunohistochemistry and chromogenic in situ hybridization for L. infantum detection. We found infection in 27 out of 50 sampled cats, among them, 14 presented coinfections. A strong correlation between splenomegaly and lymphadenomegaly with FeLV, and an association between hepatic lesions and cachexia with parasitism due to P. illiciens were observed. Moreover, we found a significant increase in the monocyte count in the FeLV-infected and a decrease in the red blood cell count in the FIV-infected animals. Amastigote forms of Leishmania spp. and tissue changes were detected in lymphoid organs of an animal coinfected with P. illiciens, T. gondii, and FIV. Polyparasitism recorded in stray cats of the Brazilian Midwest should be considered in effective control strategies for public health diseases. Moreover, stray cats of Campo Grande may be a source of infection of FIV, FeLV and P. illiciens for populations of domiciled cats.
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