Results 61 to 70 of about 2,537,645 (154)

Low‐Complexity Hybrid Beamforming for LEO Satellites: Beam Update Rate Analysis and Advanced Adaptive Precoding

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Low Earth Orbit (LEO) satellite constellations offer unprecedented opportunities for global broadband connectivity but pose significant beamforming challenges due to rapid platform motion and stringent onboard hardware constraints. Fully digital architectures, while optimal in theory, remain impractical for satellite payloads, motivating ...
Mohammad Momani, Thomas Delamotte, Andreas Knopp   +2 more
wiley   +1 more source

Integrating Image Segmentation and Deep Learning to Improve Radio Frequency Propagation Models

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT This paper proposes a multi‐sensor approach to improve radio frequency (RF) propagation models, which play a key role in the rapidly expanding field of connected vehicle technology. Focusing on the 1‐ to 20‐GHz frequency range, which is critical for both satellite‐to‐vehicle and base station‐to‐vehicle communications, our study introduces a ...
Jonathan Israel, Xavier Boulanger, Vegard Arneson   +2 more
wiley   +1 more source

LOS/NLOS Wireless Channel Identification based on Data Mining of UWB Signals

, 2019
Localisation algorithms based on the estimation of the time-of-arrival of the received signal are particularly interesting when ultra-wide band (UWB) signaling is adopted for high-definition location aware applications. In this context non-line-of-sight (
Gianluca Moro, Dardari D., Roberto Pasolini, Moro G., Davide Dardari, Pasolini R.   +5 more
core   +1 more source

Non-Line-of-Sight Identification Method for Ultra-Wide Band Based on Dual-Branch Feature Fusion Transformer

Information
In Ultra-Wide Band (UWB) positioning, wireless signals are subject to non-line-of-sight (NLOS) propagation due to obstruction by obstacles, which leads to ranging and positioning estimation errors. How to accurately and efficiently identify line-of-sight
Guangyong Xi, Shuaiyang Hu, Jing Wang, Dongyao Zou   +3 more
doaj   +1 more source

Employing Ray-Tracing and Least-Squares Support Vector Machines for Localisation

Sensors, 2018
This article evaluates the use of least-squares support vector machines, with ray-traced data, to solve the problem of localisation in multipath environments. The schemes discussed concern 2-D localisation, but could easily be extended to 3-D.
Benny Chitambira, Simon Armour, Stephen Wales, Mark Beach   +3 more
doaj   +1 more source

Pharmacological Modulation of Nrf2 Signaling Regulates Oxidative Stress, Inflammation, and Alveolar Bone Loss in Experimental Periodontitis

Journal of Periodontal Research, EarlyView.
Pharmacological activation of Nrf2 attenuated alveolar bone loss and protected periodontal tissues by reducing inflammation and oxidative stress, preserving collagen organization, and favoring bone homeostasis. Reversal of these effects by Nrf2 inhibition further supports Nrf2 signaling as a promising therapeutic target in periodontitis.
Vitória Bonan Costa, Mariely Araújo de Godoi, Angelo Constantino Camilli, Isabela Rinaldi Gomes Nogueira, Veronica Canela Estevam dos Santos, Lucas Nogueira Ramos, Juliana Silva Siqueira, Camila Renata Corrêa Camacho, Morgana Rodrigues Guimarães Stabili   +8 more
wiley   +1 more source

Azobenzene's Cross‐Scale Optics and Photonics: Molecular Photoswitching, Mesoscopic Material Motions, and Adaptive Devices

Advanced Materials, Volume 38, Issue 56, 8 October 2026.
Azobenzene photoswitches translate molecular‐scale E/Z photoisomerization into macroscopic material responses and device‐level photonic functions. This Review highlights how azobenzene research has evolved from molecular photochemistry to photoalignment, mass migration, photomechanics, and heat release, ultimately enabling holography, reconfigurable ...
Heeju Son, Soyul Kwak, Heerin Noh, Minsang Kim, Doyeon Noh, Subhayan Chakraborty, Jaewon Lee, YongDeok Cho, Kyeongsoo Kim, Taewoong Eom, Moonyoung Kim, Jangwon Kim, Hoyoung Lee, Soyoung Lee, Jaehun Kim, Grace G. D. Han, Shin‐Tson Wu, Stefano Oscurato, Arri Priimagi, Marina Saphiannikova, Seungwoo Lee   +20 more
wiley   +1 more source

Fuzzy transformer machine learning for UWB NLOS Identification and Ranging Mitigation [PDF]

Ultrawideband (UWB) is a high-precision positioning and navigation technology, it faces significant challenges due to the abundance of non-line-of-sight (NLOS) conditions in complex indoor environments.
Huang, Lu, Sun, Meng, Seow, Chee Kiat, Yang, Hongchao, Coene, Sander, Wang, Yunjia   +5 more
core   +1 more source

Analysis of Machine Learning-Based NLOS Signal Identification Algorithm for UWB Indoor Localization Using CIR Waveform Features [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Ultra-wideband (UWB) technology stands out among numerous indoor positioning techniques due to its high operating frequency, low interception capability, resistance to multipath effects, and strong penetration.
K. Wang, C. Yang
doaj   +1 more source

Müller Glia–Vasculature Interactions in the Developing Retina

Glia, Volume 74, Issue 10, October 2026.
Retinal vascular layers form normally despite loss of cholinergic retinal waves. Müller glial processes contact endothelial tip cells early and form Aquaporin‐4‐enriched endfeet. Glial endfoot calcium signals are compartmentalized and occur largely independently of neural activity. ABSTRACT Coordinated signaling among neurons, glia, and the vasculature
Samira Monshietehadi, Angel J. Garcia, Benjamin E. Smith, Matthew Tarchick, Kiara Abhayaratne, Aileen Conley, Marla B. Feller   +6 more
wiley   +1 more source