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Sleep-wake detection using recurrence quantification analysis
Chaos: An Interdisciplinary Journal of Nonlinear Science, 2018Actigraphy is a method for monitoring the movements of the nondominant arm, and the technology has found applications ranging from clinical devices to smart wristbands. Time series obtained from actigraphy data is used in chronobiology to define the sleep-wake cycle, as well as in sleep medicine to evaluate an individual’s sleep quality.
V. C. Parro, L. Valdo
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Efficient corpus design for wake-word detection
2021 IEEE Spoken Language Technology Workshop (SLT), 2021Wake-word detection is an indispensable technology for preventing virtual voice agents from being unintentionally triggered. Although various neural networks were proposed for wake-word detection, less attention has been paid to efficient corpus design, which we address in this study.
Delowar Hossain, Yoshinao Sato
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Annual Review of Fluid Mechanics, 2014
An accumulated body of quantitative evidence shows that bluff-body wakes in stably stratified environments have an unusual degree of coherence and organization, so characteristic geometries such as arrays of alternating-signed vortices have very long lifetimes, as measured in units of buoyancy timescales, or in the downstream distance scaled by a body
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An accumulated body of quantitative evidence shows that bluff-body wakes in stably stratified environments have an unusual degree of coherence and organization, so characteristic geometries such as arrays of alternating-signed vortices have very long lifetimes, as measured in units of buoyancy timescales, or in the downstream distance scaled by a body
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Wake detection in polarimetric SAR images
IGARSS 2001. Scanning the Present and Resolving the Future. Proceedings. IEEE 2001 International Geoscience and Remote Sensing Symposium (Cat. No.01CH37217), 2002Investigates wake signature in polarimetric imagery using the Radon transform. This paper describes two methods for the wake-shape detection: the first method reduces the dimension of the polarimetric data to a single channel image and the second method conserves the polarimetric information until the peak detection process.
P. Imbo, J.-C. Souyris, M. Yeremy
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Ship wakes detection in SAR images
Proceedings 7th International Conference on Signal Processing, 2004. Proceedings. ICSP '04. 2004., 2005Detecting ship wakes from spaceborne SAR images is significant. But it is particularly difficult, especially detecting-thin line features. Because those features are not only affected by speckle but also affected by various other factors and the image resolution is often coarser than the wide of the corresponding objects. In this paper, an algorithm is
null Zhu Weigang +3 more
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An entropy-based approach to wake echo analysis [ship wake radar detection]
2003 Proceedings of the International Conference on Radar (IEEE Cat. No.03EX695), 2004This paper addresses the problem of ship wake detection and analysis at low grazing angles using eigenvalue analysis of the covariance matrix. Polarimetric measurements of the wake produced by a pilot boat operating in Port Phillip Bay were obtained using the Defence Science and Technology Organisation's (DSTO) high resolution radar system.
J. Morris, S. Anderson
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Faint Ship Wake Detection in PolSAR Images
IEEE Geoscience and Remote Sensing Letters, 2018Focusing on the faint turbulent wake detection in polarimetric synthetic aperture radar (PolSAR) images, this letter introduces a novel two-step (coarse and fine processing) detector. Based on the polarization decomposition theory, a new parameter that enhances the contrast between wake and sea, which is called surface scattering randomness (SSR), is ...
Zhou Xu, Bo Tang, Shuiying Cheng
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Passive microwave detection of bubble wakes
IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004, 2004Microwave detection of ocean (sub)surface bubble populations including patches, patterns, flows, and wakes is considered. The physical principles are based on specific electromagnetic properties of the air-bubble-water media that produce strong anomalies in ocean thermal microwave emission, especially at X- C-, S- and L- bands (e.g., at wavelengths of ...
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Polarimetric detection and estimation of ship wakes
IEEE 1999 International Geoscience and Remote Sensing Symposium. IGARSS'99 (Cat. No.99CH36293), 2003Classification of Earth natural components within a full polarimetric SAR image is one of the most important applications of radar polarimetry in remote sensing. An unsupervised classification procedure, based on neural networks with competitive architectures, is applied to the full polarimetric SAR images of sea surface and ship wakes for segmentation
E. Pottier, W.M. Boerner, D.L. Schuler
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Spectroscopic detection of aircraft wake gases
Physics of Wave Phenomena, 2007Using the technique of limiting information-metric scales, the potential of laser IR absorption spectroscopy for detecting small gas components of aircraft wake was quantitatively analyzed. Formulas for minimum distinguishable and minimum detectable gas concentrations were derived.
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