Results 21 to 30 of about 142,224 (317)

UFMC-Based Underwater Voice Transmission Scheme with LDPC Codes

Applied Sciences, 2021
An underwater universal filtered multicarrier (UFMC)-based voice transmission scheme is proposed using a 512-point inverse discrete Fourier transform, utilizing 10 sub-bands, and that each had 20 subcarriers.
Chin-Feng Lin
doaj   +1 more source

Modelling tunnel thrusters for autonomous underwater vehicles [PDF]

, 2008
With 900 Autonomous Underwater Vehicles (AUVs) required over the next decade (Newman et al., 2007) existing survey-style AUVs need improved utilization factors.
Stevenson, P., Hearn, G.E., Alistair Palmer, Peter Stevenson, Grant E. Hearn, Palmer, A.   +5 more
core   +1 more source

Beamforming interferometry bathymetry method based on multi-coprime sensor array

International Journal of Distributed Sensor Networks, 2019
Recently, coprime array has been a popular research field in the application of direction-of-arrival estimation. Compared with uniform linear array, coprime array can be used to expand array aperture with fewer sensors, and it also has a nice direction ...
Tian Zhou, Jiajun Shen, Jianjun Zhu, Wanyuan Zhang, Dongdong Peng   +4 more
doaj   +1 more source

Underwater Sonography of Leg Veins [PDF]

, 2018
Objectives: Hydrostatic compression (HC) occurring during body immersion is considered beneficial for venous return from the lower limbs. No study has evaluated the effects of HC on the veins of the lower limbs using duplex ultrasound (DU).
Evi Kalodiki, Kalodiki E, Christopher Lattimer, Alberto Caggiati, Giorgio Bergamo, Sara Oberto, Dimitrios Kontothanassis, Caggiati A, Lattimer C, Oberto S, Bergamo G, The Underwater Compression Group, Kontothanassis D   +12 more
core   +1 more source

Use of Ecoacoustics to Characterize the Marine Acoustic Environment off the North Atlantic French Saint-Pierre-et-Miquelon Archipelago

Journal of Marine Science and Engineering, 2021
Visual observations of the marine biodiversity can be difficult in specific areas for different reasons, including weather conditions or a lack of observers. In such conditions, passive acoustics represents a potential alternative approach. The objective
Paul Nguyen Hong Duc, Dorian Cazau, Paul R. White, Odile Gérard, Joël Detcheverry, Frank Urtizberea, Olivier Adam   +6 more
doaj   +1 more source

Underwater optical wireless communications : depth dependent variations in attenuation [PDF]

, 2013
Depth variations in the attenuation coefficient for light in the ocean were calculated using a one-parameter model based on the chlorophyll-a concentration Cc and experimentally-determined Gaussian chlorophyll-depth profiles.
Leeson, Mark S., Green, Roger, Johnson, Laura J.   +2 more
core   +1 more source

UMI-Underwater: Learning Underwater Manipulation without Underwater Teleoperation

CoRR
Underwater robotic grasping is difficult due to degraded, highly variable imagery and the expense of collecting diverse underwater demonstrations. We introduce a system that (i) autonomously collects successful underwater grasp demonstrations via a self-supervised data collection pipeline and (ii) transfers grasp knowledge from on-land human ...
Hao Li 0076, Long Yin Chung, Jack Goler, Ryan Zhang, Xiaochi Xie, Huy Ha, Shuran Song, Mark R. Cutkosky   +7 more
openaire   +2 more sources

Review of Underwater

Open Rivers Rethinking Water Place & Community, 2022
Underwater is surprising. Lois Hendrickson and Emily Beck, the exhibit’s curators, planned the exhibit after a visitor asked if the Wangensteen Historical Library of Biology and Medicine’s expansive collection included any materials related to algae.
openaire   +2 more sources

Model predictive control of a hybrid autonomous underwater vehicle with experimental verification [PDF]

, 2014
In this work model predictive control is used to provide transit and hover capabilities for an autonomous underwater vehicle where the description of the system dynamics used include terms measured experimentally.
Bodles, Kenneth, Evans, D.W., Evans, Derek W., Harris, C., Turnock, S.R., Rogers, E., Steenson, L.V., Phillips, A.B., Wang, L., Bodles, K., Furlong, M.E., Wang, Liuping   +11 more
core   +1 more source

MIMO Underwater Acoustic Communications in Ports and Shallow Waters at Very High Frequency

Journal of Sensor and Actuator Networks, 2013
Hermes is a Single-Input Single-Output (SISO) underwater acoustic modem that achieves very high-bit rate digital communications in ports and shallow waters. Here, the authors study the capability of Hermes to support Multiple-Input-Multiple-Output (MIMO)
Gaultier Real, Pierre-Philippe Beaujean, Pierre-Jean Bouvet   +2 more
doaj   +1 more source