Results 41 to 50 of about 243 (163)

A Unified Optimization Framework for LEO Hybrid Constellations Using an Improved Continuous Coefficient Method

Advances in Astronomy, Volume 2026, Issue 1, 2026.
Low Earth orbit (LEO) constellations are increasingly deployed to provide integrated services such as communication, navigation augmentation, and remote sensing. However, traditional constellation designs—such as Walker, streets‐of‐coverage (SoC), and Flower constellations—rely on distinct parameter sets, making unified optimization of hybrid ...
Lin Pan, Lan Du, Zhongkai Zhang, Lundong Zhang, Zejun Liu, Peiyuan Zhou, Chonghui Li, Jianguo Yan   +7 more
wiley   +1 more source

HPDL Variant Type Correlates With Clinical Disease Onset and Severity

Annals of Clinical and Translational Neurology, Volume 12, Issue 7, Page 1360-1367, July 2025.
ABSTRACT Objective Recently, a mitochondrial encephalopathy due to biallelic HPDL variants was described, associated with a broad range of clinical manifestations ranging from severe, infantile‐onset neurodegeneration to adolescence‐onset hereditary spastic paraplegia. HPDL converts 4‐hydroxyphenylpyruvate acid (4‐HPPA) into 4‐hydroxymandelate (4‐HMA),
Eun Hye Lee, Olivia Kim‐Mcmanus, Jennifer H. Yang, Richard Haas, Maha S. Zaki, Ghada M. H. Abdel‐Salam, Yuji Nakamura, Mohamed S. Abdel‐Hamind, Darius Ebrahimi‐Fakhari, Julian E. Alecu, Nicola Brunetti‐Pierri, Varunvenkat M. Srinivasan, Vykuntaraju K. Gowda, Stephanie Gross, Yasemin Alanay, Paria Najarzadeh Totbati, Manya Yadavilli, Liana Friedman, Naomi Meave Ojeda, Joseph G. Gleeson   +19 more
wiley   +1 more source

Concomitant Use of Oral Anticoagulants With Oral Dipeptidyl Peptidase‐4 Inhibitors and Serious Bleeding Events

Clinical Pharmacology &Therapeutics, Volume 117, Issue 4, Page 1012-1016, April 2025.
In a prior screening study, saxagliptin, a dipeptidyl peptidase‐4 inhibitor (DPP‐4i), was found to have an increased rate of serious bleeding when used concomitantly with several oral anticoagulants (OACs). We aimed to confirm or refute the associations between concomitant use of individual OACs and DPP‐4is and serious bleeding in a large US database ...
Thanh Phuong Pham Nguyen, Charles E. Leonard, Colleen M. Brensinger, Warren B. Bilker, Sophie P. Chung, John R. Horn, Kacie Bogar, Todd A. Miano, Sean Hennessy   +8 more
wiley   +1 more source

Characterization of Pseudorange Errors in Hybrid LEO/MEO PNT System

Sensors
Integrating low Earth orbit (LEO) satellites into GNSS (Global Navigation Satellite System) MEO (Medium Earth Orbit) constellations enhances global positioning but faces technical bottlenecks. Through a 1D vehicular scenario simulation using MATLAB-based
Andrea Bianconi, Omar Morandi, Simone Morosi, Marco Dolfi   +3 more
doaj   +1 more source

Overview of Hybrid Satellite–Terrestrial Networks (HSTNs): Key Technologies and Upcoming Challenges

Journal of Computer Networks and Communications, Volume 2025, Issue 1, 2025.
Hybrid satellite–terrestrial networks (HSTNs) represent a crucial technology in the advancement of next‐generation communication systems, including 6 G. This paper presents an in‐depth review of cooperative and cognitive HSTNs, highlighting the key technologies, system models, and performance metrics that define their operation.
Akbar Asgharzadeh-Bonab, Hashem Kalbkhani, Yaser Azimi, Farid Ahmadi, Giovanni Pau   +4 more
wiley   +1 more source

Design of Extended Weil Code Families via Goldbach-Based Prime Concatenation for LEO-PNT Systems

Applied Sciences
Low Earth Orbit (LEO)-based positioning, navigation, and timing (PNT) systems have attracted growing interest owing to their strong transmission power and rapid Precise Point Positioning (PPP) convergence.
Jae Duk Yoo, Seungsoo Yoo, Ju-Hyun Maeng, Gyu-In Jee, Sun Yong Kim   +4 more
doaj   +1 more source

Survey on positioning technology based on signal of opportunity from low earth orbit

Frontiers in Physics
Positioning, Navigation, and Timing (PNT) services are essential for supporting various aspects of modern society. Fields such as communications, transportation, and military operations heavily rely on accurate and reliable PNT services, with this ...
Jiawei He, Jiawei He, Shaojie Ni, Shaojie Ni, Honglei Lin, Honglei Lin, Zhe Liu, Zhe Liu, Zhibin Xiao, Zhibin Xiao   +9 more
doaj   +1 more source

Poster Sessions

HemaSphere, Volume 10, Issue S1, June 2026.
wiley   +2 more sources

The Impact and Sources of Radio Frequency Interference on GNSS Signals

Radio Science, Volume 59, Issue 12, December 2024.
Abstract The utilization of the global navigation satellite systems (GNSS) services in both military and civilian applications as well as for scientific investigation has grown exponentially. However, the increasing reliance on GNSS applications has raised concerns about potential risks from intentional radio frequency interference (RFI) transmitters ...
Endawoke Yizengaw
wiley   +1 more source

Facets of security and safety problems and paradigms for smart aerial mobility and intelligent logistics

IET Intelligent Transport Systems, Volume 18, Issue S1, Page 2827-2855, December 2024.
Sporadic deployment of unmanned aerial vehicles for priority‐based logistics demands inclusive safety‐driven and security smartness to address the myriads of associated risks. The incremental integration of explainable AI, blockchain, and zero trust cybersecurity paradigms is essential to achieving this, albeit with several requirements and ...
Simeon Okechukwu Ajakwe, Dong‐Seong Kim   +1 more
wiley   +1 more source