Results 71 to 80 of about 269,792 (251)

Carbon and oxygen in metal-poor halo stars

, 2019
Carbon and oxygen are key tracers of the Galactic chemical evolution; in particular, a reported upturn in [C/O] towards decreasing [O/H] in metal-poor halo stars could be a signature of nucleosynthesis by massive Population III stars. We reanalyse carbon,
Amarsi, A. M., Asplund, M., Barklem, P. S., Lind, K., Nissen, P. E.   +4 more
core   +1 more source

Beyond 5G and Non‐terrestrial Network (NTN) Integrated Architecture: Access Challenges for Expanding Artificial Intelligence of Things (AIoT)

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT This study analyzes the architecture of the beyond 5G‐NTN (Non‐terrestrial Network) integrated network and presents the technical, legal, and regulatory challenges and considerations for expanding the Artificial Intelligence of Things (AIoT) ecosystem.
Byung Woon Kim, Ga Eun Choi
wiley   +1 more source

Experimental Evaluation of the Shadowing of a Planar Antenna Caused by a Quadcopter Frame

Electrical, Control and Communication Engineering, 2020
The use of mobile data transfer can significantly increase the range of the remote-controlled operation of multirotor aerial vehicles. The planar antennas of ready-to-use 3G/LTE cellular communication dongles provide a low-cost and lightweight ...
Heydarov Ibrahim, Brodnevs Deniss
doaj   +1 more source

NOISE RESISTANCE OF REMOTE AUTHENTICATION VIA LTE NETWORK

Information and Telecommunication Sciences, 2020
Background. LTE networks support a wide range of applications and services. These networks provide high-quality mobile services and have increased transmission rates and often used for remote biometric authentication, but the influence of noise and ...
Andrii Astrakhantsev, Galyna Liashenko, Anna Shcherbak   +2 more
doaj   +1 more source

Integrated LEO Constellation and In‐Cabin Distribution System for Continuous Aircraft 5G Connectivity

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT The integration of low Earth orbit (LEO) satellite constellations with commercial aircraft communication systems presents critical challenges in maintaining continuous connectivity during dynamic flight conditions. Current geostationary satellite systems suffer from high round‐trip latency (>$$ > $$ 500 ms) and inadequate coverage at high ...
Raúl Parada, Victor Monzon Baeza, Carlos Horcajo Fernández de Gamboa, Rocío Serrano Camacho, Carlos Monzo   +4 more
wiley   +1 more source

Feasibility Analysis of LTE-Based UAS Navigation in Deep Urban Areas and DSRC Augmentation

Sensors, 2019
The current autonomous navigation of unmanned aircraft systems (UAS) heavily depends on Global Navigation Satellite Systems (GNSS). However, in challenging environments, such as deep urban areas, GNSS signals can be easily interrupted, so that UAS may ...
Euiho Kim, Yujin Shin
doaj   +1 more source

Metode Cell Splitting pada Perencanaan Microcell untuk Meningkatkan Performansi Jaringan LTE

Jurnal Elkomika, 2020
ABSTRAK Berdasarkan hasil survei dan drive test menggunakan standar operator 3 di wilayah Jalan Kebon Kopi, Kota Cimahi, bahwa nilai parameter LTE yang diperoleh masuk kategori buruk. Hal ini ditunjukkan oleh nilai parameter RSRP
FIQHI ANUGERAH, HASANAH PUTRI
doaj   +1 more source

Non-LTE Model Atmospheres for Late-Type Stars II. Restricted NLTE Calculations for a Solar-Like Atmosphere

, 2003
We test our knowledge of the atomic opacity in the solar UV spectrum. Using the atomic data compiled in Paper I from modern, publicly available, databases, we perform calculations that are confronted with space-based observations of the Sun.
Antia H. M., Baumuller D., Baumuller D., Bell R. A., Brueckner G. E., Bruls J. H. M. J., Carlos Allende Prieto, Castelli F., Chmielewski Y., David L. Lambert, Frohlich C., Garcia Lopez R. J., Grevesse N., Holweger H., Houtgast J., Huang T.-Y., Ivan Hubeny, Kiselman D., Kiselman D., Kurucz R. L., Labs D., Larkin A., Malagnini M. L., Morossi C., Peterson R. C., Przybilla N., Rottman G. J., Takeda Y., Woods T. N., Zhao G.   +29 more
core   +2 more sources

Guest Editorial: Unfolding the potential of 5G technologies for future wireless networks

IET Networks, EarlyView.
Abstract With the rapid advancements in mobile Internet and smartphones, data traffic in current mobile communication systems is growing exponentially. At the same time, demands for lower latency, increased robustness, and higher energy efficiency are becoming more stringent.
Gwanggil Jeon, Awais Ahmad, Abdellah Chehri, Shiping Wen   +3 more
wiley   +1 more source

Analisis Kelayakan Implementasi Teknologi LTE 1.8 GHz Bagi Operator Seluler di Indonesia [Feasibility Analysis of LTE 1.8 GHz for Mobile Operators in Indonesia]

Buletin Pos dan Telekomunikasi: Media Komunikasi Ilmiah, 2015
Peningkatan kebutuhan layanan data mendorong operator telekomunikasi berusaha mengimplementasikan jaringan akses broadband yang lebih handal.  Teknologi LTE merupakan salah satu teknologi dengan kecepatan mencapai tiga kali dibanding teknologi HSDPA ...
Sri Ariyanti, Doan Perdana
doaj   +1 more source