Results 31 to 40 of about 2,478 (258)

Satellite handover techniques for LEO networks [PDF]

International Journal of Satellite Communications and Networking, 2004
AbstractLow earth orbit satellite constellations could play an important role in future mobile communication networks due to their characteristics, such as global coverage and low propagation delays. However, because of the non‐stationarity of the satellites, a call may be subjected to handovers, which can be cell or satellite handovers.
Papapetrou, E., Karapantazis, S., Dimitriadis, G., Pavlidou, F. N.   +3 more
openaire   +2 more sources

Initial Design for Next-Generation BeiDou Integrity Subsystem: Space–Ground Integrated Integrity Monitoring

Remote Sensing
It is essential to provide high-integrity navigation information for safety-critical applications. Global navigation satellite systems (GNSSs) play an important role in these applications because they can provide global, high-accuracy, all-weather ...
Weiguang Gao, Lei Chen, Feiren Lv, Xingqun Zhan, Lin Chen, Yuqi Liu, Yongshan Dai, Yundi Jin   +7 more
doaj   +1 more source

Circulating microRNA signatures of cachexia and cancer in Canis familiaris as a comparative oncology model for human disease

Molecular Oncology, EarlyView.
Circulating microRNAs as biomarkers of cachexia and sex‐specific cancer in senior dogs. In 25 client‐owned dogs, four circulating miRNAs (miR‐15a, miR‐15b, miR‐16, miR‐140) were downregulated in cachexia, with miR‐16 the strongest individual biomarker (AUC = 0.899).
Soon‐Seok Park, Kyongman An, Gyeonghwa Kim, Soo‐Nyun Choi, Hong‐Ki Lee, Keun Hur, Kyu‐Shik Jeong   +6 more
wiley   +1 more source

Delivery of DNA‐encoded vaccines and proteins in mice using cutaneous suction‐mediated transfection

FEBS Open Bio, EarlyView.
Cutaneous suction‐mediated transfection in mice for delivery of DNA‐encoded vaccines and proteins. A critical limitation of DNA vaccines and other therapeutics is transfection in vivo to produce the encoded antigens or therapeutic proteins. Cutaneous suction‐based methods have demonstrated effectiveness in many animal models and have been successfully ...
Emran O. Lallow, Isabel Brandtjen, Yaxin Mo, Melissa Gulley, Louis Osorio, Sagar Kudchodkar, Nandita C. Jhumur, Christine C. Roberts, Lisa K. Denzin, David I. Shreiber, Biju Parekkadan, Hao Lin, Joel N. Maslow   +12 more
wiley   +1 more source

Satellite Selection Strategy and Method for Signals of Opportunity Navigation and Positioning with LEO Communication Satellites

Sensors
Experts and scholars from various nations have proposed studying low Earth orbit (LEO) satellite signals as the space-based signals of opportunity (SOPs) for navigation and positioning.
Yanhua Tao, Yang Guo, Shaobo Wang, Chuanqiang Yu, Zimo Zhu   +4 more
doaj   +1 more source

Instantaneous velocity determination and positioning using Doppler shift from a LEO constellation

Satellite Navigation, 2023
To provide backup and supplementation for the Global Navigation Satellite System (GNSS), Doppler shift from Low Earth Orbit (LEO) satellites can be used as signals of opportunity to provide positioning, navigation, and timing service.
Fei Guo, Yan Yang, Fujian Ma, Yifan Zhu, Hang Liu, Xiaohong Zhang   +5 more
doaj   +1 more source

Autonomous Mission Planning Method for Optical Imaging Satellites Based on Real-Time Cloud Cover Information

Remote Sensing, 2022
Cloud cover is an important factor limiting the earth observation efficiency of optical imaging satellites. Existing solutions include avoiding cloudy observation time windows by onboard cloud detectors and ground monitors, which are difficult to improve
Zhiliang Li, Limin Zhao, Yun Liu, Xingfeng Chen, Hang Chen, Fengjie Zheng, Yunli Zhang, Donghong Wang, Jiaguo Li, Jun Liu, Shumin Liu   +10 more
doaj   +1 more source

FDG‐PET Associations With Disease Severity and Outcomes in NMDA‐Receptor IgG Autoimmune Encephalitis

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Background Patients with N‐methyl‐D‐aspartate (NMDA) receptor‐immunoglobulin G (IgG) autoimmune encephalitis (NMDAR‐IgG AE) demonstrate occipital lobe hypometabolism on baseline brain fluorodeoxyglucose‐positron emission tomography (bFDG‐PET).
Jonathan K. Lee, Jeffrey Lambe, Scott Johnson, Akua Abrah, Jennifer Bullen, Jeffrey A. Cohen, Tatchaporn Ongphichetmetha, Amy Kunchok   +7 more
wiley   +1 more source

Improved PPP Ambiguity Resolution with the Assistance of Multiple LEO Constellations and Signals

Remote Sensing, 2019
The fusion of low earth orbit (LEO) constellation and Global Navigation Satellite Systems (GNSS) can increase the number of visible satellites and optimize spatial geometry, which is expected to improve the performance of precise point positioning (PPP ...
Xin Li, Xingxing Li, Fujian Ma, Yongqiang Yuan, Keke Zhang, Feng Zhou, Xiaohong Zhang   +6 more
doaj   +1 more source

Modulation and Signal Processing for LEO-LEO Optical Inter-Satellite Links

IEEE Access, 2023
Nous étudions les aspects clés des communications optiques cohérentes sur les liaisons inter-satellites (ISL) pour les constellations ultra-denses de prochaine génération en orbite terrestre basse (LEO). Dans un premier temps, la pertinence des formats de modulation QPSK, 8-QAM et 16-QAM avec différents débits de symboles (28 GBaud, 60 GBaud et 120 ...
Igor P. Vieira, T. C. Pita, Darli A. A. Mello   +2 more
openaire   +3 more sources