Mitchell Silva

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Environmental conditions likely affect physiology and behaviour of mice used for life sciences research on Earth or in Space. Here, we analysed the effects of cage confinement on the weightbearing musculoskeletal system, behaviour and stress of wild-type mice (C57BL/6JRj, 30 g b.wt., total n = 24) housed for 25 days in a prototypical ground-based and fully(More)
Hypoxemic patients with chronic obstructive pulmonary disease (COPD) are at risk of carbon dioxide (CO(2)) retention during oxygen therapy and hypercapnia in COPD is associated with an ominous prognosis. Rebreathing with oxygen mask is possible in practice and possibly affects CO(2) retention due to an increased inspired fraction of CO(2). Its effects on(More)
In this article, an automated and accurate mouse observation method, based on a conventional test for motor function evaluation, is outlined. The proposed measurement technique was integrated in a regular open-field test, where the trajectory and locomotion of a free-moving mouse were measured simultaneously. The system setup consisted of a transparent cage(More)
Cough can be a biomarker in case of respiratory diseases. By monitoring and analyzing cough sounds through automatic devices, the farmer can obtain an early warning about a developing outbreak of respiratory infections. Cough sounds can be characterized by particular acoustic features (amplitude, frequency and duration) that are obtained by sound recording,(More)
This paper considers the online localization of sick animals in pig houses. It presents an automated online recognition and localization procedure for sick pig cough sounds. The instantaneous energy of the signal is initially used to detect and extract individual sounds from a continuous recording and their duration is used as a preclassifier.(More)
BACKGROUND The presence of decoupling, i.e. the absence of coupling between fundamental frequency variation and energy envelope during phonetic crying, and its extent, reflects the degree of maturation of the central nervous system. AIM We hereby wanted to assess the existence and extent of decoupling in term neonates (neurodevelopmental relevance) and(More)
BACKGROUND The presence of decoupling, i.e. the absence of coupling between fundamental frequency variation and intensity contour during phonetic crying, and its extent, reflects the degree of maturation of the central nervous system. OBJECTIVES The aim of this work was to evaluate whether Empirical Mode Decomposition (EMD) is a suitable technique for(More)
Cough is a symptom and central element for diagnosis of very common respiratory affection causes of death and loss of productivity in intensive pig farms. The aim of this research is the comparison between acoustic features of cough sounds originating from infectious and non infectious diseases. The acoustic parameters investigated are Peak Frequency and(More)
This paper extends existing cough identification methods and proposes a real-time version for identifying sick pig cough sounds. The analysis and classification is based on the frequency domain characteristics of the signal, while an improved procedure to extract the reference is presented. This technique evaluates fuzzy c-means clustering to parts of the(More)
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