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Remote Sensing

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8 papers 0 to 25 followers
By Tom Wassmer Assistant Professor of Biology at Siena Heights University in Adrian, Michigan
https://www.readbyqxmd.com/read/27305927/habitat-specific-foraging-strategies-in-australasian-gannets
#1
Melanie R Wells, Lauren P Angel, John P Y Arnould
Knowledge of top predator foraging adaptability is imperative for predicting their biological response to environmental variability. While seabirds have developed highly specialised techniques to locate prey, little is known about intraspecific variation in foraging strategies with many studies deriving information from uniform oceanic environments. Australasian gannets (Morus serrator) typically forage in continental shelf regions on small schooling prey. The present study used GPS and video data loggers to compare habitat-specific foraging strategies at two sites of contrasting oceanographic regimes (deep water near the continental shelf edge, n=23; shallow inshore embayment, n=26), in south-eastern Australia...
July 15, 2016: Biology Open
https://www.readbyqxmd.com/read/27023543/complex-human-activity-recognition-using-smartphone-and-wrist-worn-motion-sensors
#2
Muhammad Shoaib, Stephan Bosch, Ozlem Durmaz Incel, Hans Scholten, Paul J M Havinga
The position of on-body motion sensors plays an important role in human activity recognition. Most often, mobile phone sensors at the trouser pocket or an equivalent position are used for this purpose. However, this position is not suitable for recognizing activities that involve hand gestures, such as smoking, eating, drinking coffee and giving a talk. To recognize such activities, wrist-worn motion sensors are used. However, these two positions are mainly used in isolation. To use richer context information, we evaluate three motion sensors (accelerometer, gyroscope and linear acceleration sensor) at both wrist and pocket positions...
2016: Sensors
https://www.readbyqxmd.com/read/26317623/the-use-of-acceleration-to-code-for-animal-behaviours-a-case-study-in-free-ranging-eurasian-beavers-castor-fiber
#3
Patricia M Graf, Rory P Wilson, Lama Qasem, Klaus Hackländer, Frank Rosell
Recent technological innovations have led to the development of miniature, accelerometer-containing electronic loggers which can be attached to free-living animals. Accelerometers provide information on both body posture and dynamism which can be used as descriptors to define behaviour. We deployed tri-axial accelerometer loggers on 12 free-ranging Eurasian beavers Castor fiber in the county of Telemark, Norway, and on four captive beavers (two Eurasian beavers and two North American beavers C. canadensis) to corroborate acceleration signals with observed behaviours...
2015: PloS One
https://www.readbyqxmd.com/read/25749552/instrumenting-gait-with-an-accelerometer-a-system-and-algorithm-examination
#4
A Godfrey, S Del Din, G Barry, J C Mathers, L Rochester
Gait is an important clinical assessment tool since changes in gait may reflect changes in general health. Measurement of gait is a complex process which has been restricted to the laboratory until relatively recently. The application of an inexpensive body worn sensor with appropriate gait algorithms (BWM) is an attractive alternative and offers the potential to assess gait in any setting. In this study we investigated the use of a low-cost BWM, compared to laboratory reference using a robust testing protocol in both younger and older adults...
April 2015: Medical Engineering & Physics
https://www.readbyqxmd.com/read/25742171/low-energy-physical-activity-recognition-system-on-smartphones
#5
Luis Miguel Soria Morillo, Luis Gonzalez-Abril, Juan Antonio Ortega Ramirez, Miguel Angel Alvarez de la Concepcion
An innovative approach to physical activity recognition based on the use of discrete variables obtained from accelerometer sensors is presented. The system first performs a discretization process for each variable, which allows efficient recognition of activities performed by users using as little energy as possible. To this end, an innovative discretization and classification technique is presented based on the χ2 distribution. Furthermore, the entire recognition process is executed on the smartphone, which determines not only the activity performed, but also the frequency at which it is carried out...
2015: Sensors
https://www.readbyqxmd.com/read/25709837/movement-resting-and-attack-behaviors-of-wild-pumas-are-revealed-by-tri-axial-accelerometer-measurements
#6
Yiwei Wang, Barry Nickel, Matthew Rutishauser, Caleb M Bryce, Terrie M Williams, Gabriel Elkaim, Christopher C Wilmers
BACKGROUND: Accelerometers are useful tools for biologists seeking to gain a deeper understanding of the daily behavior of cryptic species. We describe how we used GPS and tri-axial accelerometer (sampling at 64 Hz) collars to monitor behaviors of free-ranging pumas (Puma concolor), which are difficult or impossible to observe in the wild. We attached collars to twelve pumas in the Santa Cruz Mountains, CA from 2010-2012. By implementing Random Forest models, we classified behaviors in wild pumas based on training data from observations and measurements of captive puma behavior...
2015: Movement Ecology
https://www.readbyqxmd.com/read/25643056/citizen-sensors-for-shm-use-of-accelerometer-data-from-smartphones
#7
Maria Feng, Yoshio Fukuda, Masato Mizuta, Ekin Ozer
Ubiquitous smartphones have created a significant opportunity to form a low-cost wireless Citizen Sensor network and produce big data for monitoring structural integrity and safety under operational and extreme loads. Such data are particularly useful for rapid assessment of structural damage in a large urban setting after a major event such as an earthquake. This study explores the utilization of smartphone accelerometers for measuring structural vibration, from which structural health and post-event damage can be diagnosed...
2015: Sensors
https://www.readbyqxmd.com/read/25643743/ocean-sunfish-rewarm-at-the-surface-after-deep-excursions-to-forage-for-siphonophores
#8
Itsumi Nakamura, Yusuke Goto, Katsufumi Sato
Ocean sunfish (Mola mola) were believed to be inactive jellyfish feeders because they are often observed lying motionless at the sea surface. Recent tracking studies revealed that they are actually deep divers, but there has been no evidence of foraging in deep water. Furthermore, the surfacing behaviour of ocean sunfish was thought to be related to behavioural thermoregulation, but there was no record of sunfish body temperature. Evidence of ocean sunfish feeding in deep water was obtained using a combination of an animal-borne accelerometer and camera with a light source...
May 2015: Journal of Animal Ecology
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