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This paper proposes a novel framework for detecting and localizing the transients corresponding to the shocks created by sediment impacts on a steel plate. Based on unsupervised hierarchical agglomeration of complex vibration spectra, the derived classification is available for bedload transport monitoring stations in underwater environement.
This paper proposes the performance analysis of different transmission waveforms employed for fish monitoring by active ultrasound systems. The obtained results are analyzed both qualitatively and quantitatively in terms of frame rate, Signal-to-Noise Ratio and resolution at the reception.
This paper proposes a novel online software nonlinearity correction algorithm for acoustic active monitoring in aquatic environments. Based on irregular time resampling (time warping), coupled with statistical estimation, the estimated reference function is available for further match filtering at the reception.
Very strong recent researches offer details about pelvic asymmetry and its pattern of growth. Asymmetric growth of the ilium bone from birth to adolescence and its statistical incidence besides asymmetric growing of other bodies' parts incidence impose the necessity to design a simple test for the risk of scoliosis due to pelvic or sacroiliac asymmetric disorders. The pelvis area is the base support...
This paper investigates the potential of active ultrasound jellyfish monitoring systems to continuously detect, quantify and identify different species in turbulent underwater environments. The experimentations carried out in December 2015 at the Aquarium de Paris, France, are used to propose an unified acoustic signal processing framework for visualizing jellyfish passages.
This paper introduces the concept of automatic reference selection for active ultrasound wild salmon monitoring systems in turbulent underwater environments. A general in situ calibration procedure is proposed which allows grate improvements in terms of fish detection, identification and tracking capabilities.
This paper introduces the concept of coupling ultrasound transducers with piezoelectric accelerometers for active ultrasound bedload monitoring in underwater environments. A general system calibration procedure is proposed which allows the enduser to establish a real-time link between the energy of the received signals and the bedload transport phenomena.
Detection of objects in underwater environment is an important operation that can be aimed to assess the pollution in the region under study as well as to prevent intrusion of undesired objects in off shore power production facilities or in the restricted entrance area. The use of acoustic methods has been proven to be very powerful for the detection and localization of the underwater objects. This...
Transient signals have proved to be difficult to characterize/classify because of their short duration and broad spectrum. Methods based on time-frequency analysis are used for transient detection, but their characterization is limited when it comes to similar signals that have close amplitudes and frequencies. This paper presents the multi-lag phase space analysis, an alternative to the classical...
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