Results 91 to 100 of about 75,227 (355)

A Method for Underwater Image Enhancement Utilizing Polarization Inspired by the Mantis Shrimp’s Multi-Dimensional Visual Imaging Mechanism

Journal of Marine Science and Engineering
Optical attenuation caused by absorption and scattering in turbid water significantly degrades underwater image quality, making reliable underwater imaging a challenging problem.
Qingyu Liu, Ruixin Li, Congcong Li, Canrong Chen, Yifan Huang, Huayu Yang, Fei Yuan   +6 more
doaj   +1 more source

Modular Electronic Microrobots With Onboard Sensor‐Program‐Steered Locomotion

Advanced Intelligent Systems, EarlyView.
Modular electronic smartlet microrobots integrate ambient‐light energy harvesting, photodetection, programmable CMOS control, and bubble‐based actuation within a sub‐millimeter fold‐up architecture. A 58‐bit on‐board CMOS chiplet enables sensor–program steered switching between independently addressable actuators, achieving closed‐loop 2D navigation in
Vineeth K. Bandari, Yeji Lee, Pranathi Adluri, Daniil Karnaushenko, Dmitriy D. Karnaushenko, John S. McCaskill, Oliver G. Schmidt   +6 more
wiley   +1 more source

Digital signal processing for underwater acoustic in-band full-duplex communication

, 2023
Cimini, Leonard J., Jr.Xia, Xiang-GenSong, AijunAcoustic signals are widely used for communication in the underwater environment. However, due to using narrow acoustic frequency bands, underwater transmission suffers from low data rates.
Towliat, Mohammad
core   +1 more source

Joint Representation and Recognition for Ship-Radiated Noise Based on Multimodal Deep Learning

Journal of Marine Science and Engineering, 2019
Ship recognition based on ship-radiated noise is one of the most important and challenging subjects in underwater acoustic signal processing. The recognition methods for ship-radiated noise recognition include traditional methods and deep learning (DL ...
Fei Yuan, Xiaoquan Ke, En Cheng
doaj   +1 more source

Acoustic Parametric Signal Generation for Underwater Communication [PDF]

Sensors, 2018
This paper presents a study of different types of parametric signals with application to underwater acoustic communications. In all the signals, the carrier frequency is 200 kHz, which corresponds to the resonance frequency of the transducer under study and different modulations are presented and compared.
María Campo-Valera, Miguel Ardid, Dídac Diego-Tortosa, Ivan Felis, Juan Antonio Martínez-Mora, Carlos D. Llorens, Pablo Cervantes   +6 more
openaire   +4 more sources

Mimicking Ship-Radiated Noise With Chaos Signal for Covert Underwater Acoustic Communication

IEEE Access, 2020
With the increasingly fierce competition for marine resources, underwater acoustic communication as the main form of underwater communication, its security has received more and more attention. The traditional underwater acoustic communication technology
Shuhua Huang, Xiaogeng Hou, Weiwei Liu, Guangjie Liu, Yue-wei Dai, Wen Tian   +5 more
semanticscholar   +1 more source

Guiding and Manipulating Light Fields in Microstructured Liquid Crystals

Advanced Physics Research, EarlyView.
This review summarizes recent advances in guided‐wave optics enabled by microstructured liquid crystal (LC) devices, covering their fundamental material properties, key degree of freedom for dynamic light field manipulations. The advances of linear guided‐wave optics, nonlinear‐optics with spatial optical solitons, and microlasers in LC‐based devices ...
Shan‐shan Chang, Yong‐shuai Li, Jin‐hui Chen   +2 more
wiley   +1 more source

From Ship to Shore: A Review of Vessel‐To‐Grid Bidirectional Charging for Sustainable Maritime Transport

EcoEnergy, EarlyView.
As maritime transport electrifies, bidirectional charging (V2G) offers a dual‐purpose solution for energy resilience and economic viability. This work identifies key technological advancements and lifecycle challenges utilizing practical case studies to demonstrate how V2G systems can drive decarbonization and grid stability in the marine sector ...
Jonathan Bloor, Tamer Kamel, Sarah Fear, Lee J. Durndell   +3 more
wiley   +1 more source

Underwater Acoustic Target Recognition Based on Supervised Feature-Separation Algorithm

Sensors, 2018
For the purpose of improving the accuracy of underwater acoustic target recognition with only a small number of labeled data, we proposed a novel recognition method, including 4 steps: pre-processing, pre-training, fine-tuning and recognition.
Xiaoquan Ke, Fei Yuan, En Cheng
doaj   +1 more source

Recent advances in multifunctional soft robots: A materials–structures–systems co‐design perspective for synergistic integration

FlexMat, EarlyView.
Abstract Soft robots, engineered from highly compliant materials, offer superior adaptability and safety in unstructured environments compared to their rigid counterparts. Recent advancements, fueled by bio‐inspiration and material programmability, have led to the rapid co‐evolution of their core modules: actuation, sensing, protection, energy, and ...
Qiulei Liu, Zicao Peng, Chong Sun, Haitao Yang   +3 more
wiley   +1 more source