Results 31 to 40 of about 4,672,975 (205)

Underwater Wireless Communications

open access: yesSensors
Effective underwater wireless communications (UWCs) are essential for a variety of military and civil applications, such as submarine communication and discovery of new natural resources in the underwater environment [...]
Hamada Esmaiel, Haixin Sun
openaire   +3 more sources

Node Energy Consumption Balanced Multi-Hop Transmission for Underwater Acoustic Sensor Networks Based on Clustering Algorithm

open access: yesIEEE Access, 2020
With the advancement and implementation of marine strategies in various countries, it is of great significance to collect marine data by using underwater acoustic sensor networks (UWA-SNs).
Meihuang Wang   +4 more
doaj   +1 more source

Sound Reception in the Yangtze Finless Porpoise and Its Extension to a Biomimetic Receptor

open access: yesBiomimetics, 2023
Sound reception was investigated in the Yangtze finless porpoise (Neophocaena phocaenoides asiaeorientalis) at its most sensitive frequency. The computed tomography scanning, sound speed, and density results were used to develop a three-dimensional ...
Zhongchang Song   +8 more
doaj   +1 more source

Environmental-friendly underwater acoustic communication and networks [PDF]

open access: yes, 2012
Intense harvesting of ocean resources extended exploitation activities to previously unexplored open ocean areas, to greater ocean depths and to remote polar regions. Such activities include, but are not limited to, energy, geology and fisheries.
Jesus, S. M.
core   +1 more source

MF-HER: Marine Mammal-Friendly Based High Spectral-Efficient Routing for Underwater Acoustic Sensor Networks

open access: yesIEEE Access, 2020
In real ocean environments, artificial acoustic and natural acoustic systems are coexisted to share scarce spectrum resources. In this paper, we propose a marine mammals-friendly based high spectral-efficient routing (MF-HER) protocol to improve spectrum
Yougan Chen   +4 more
doaj   +1 more source

Scene-Driven Semantic Alignment for Generative Communication in Underwater Images

open access: yesIET Signal Processing
Underwater images serve as one of the most intuitive media for human perception of underwater environments. However, the limited bandwidth and susceptibility to noise in underwater acoustic (UWA) channels pose significant challenges for traditional image
Yuetong Li   +4 more
doaj   +1 more source

A Fish-Counting Method Using Fusion of Spatial Sensing and Temporal Information

open access: yesRemote Sensing
In modern aquaculture, accurate and efficient fish counting is crucial for the optimization of resource management and the enhancement of production profitability.
Zhaozhi Wu   +6 more
doaj   +1 more source

Underwater TDOA Acoustical Location Based on Majorization-Minimization Optimization

open access: yesSensors, 2020
Underwater acoustic localization is a useful technique applied to any military and civilian applications. Among the range-based underwater acoustic localization methods, the time difference of arrival (TDOA) has received much attention because it is easy
Shuangshuang Li   +2 more
doaj   +1 more source

Adaptive Underwater Acoustic Communications [PDF]

open access: yes, 2010
Underwater wireless networks consist of mobile and static nodes, which usually communicate using the acoustic channel since radio transmissions attenuate rapidly and optical communication is only suitable for short distances. The underwater acoustic channel is plagued with issues of high transmission power requirements, rapidly changing channel ...
Anuj Sehgal, Jürgen Schönwälder
openaire   +1 more source

Underwater Image Enhancement Using An Integrated Colour Model. [PDF]

open access: yes, 2007
In underwater situations, clarity of images are degraded by light absorption and scattering. This causes one colour to dominate the image.
Talib, Abdullah Zawawi   +3 more
core   +1 more source

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