Results 31 to 40 of about 4,504,195 (241)

PS-MADDPG-BGMPOA: Co-Channel Interference Avoidance for LEO Beam-Hopping Satellite Systems via Multi-Parameter Optimization of Beam Geometry

AI
In Low Earth Orbit Beam-Hopping Satellite Systems (L-BHSS), co-channel interference among beams severely degrades communication quality. To address the inter-beam co-channel interference avoidance problem, this paper proposes a Parameter-Sharing Multi ...
Yanjun Song, Jianan Hou, Lidong Zhu, Yi Zheng   +3 more
doaj   +1 more source

Joint Power and Bandwidth Allocation Algorithm with Inter-beam Interference for Multi-beam Satellite [PDF]

Jisuanji gongcheng, 2018
In consideration of the inter-beam interference in multi-beam satellite communication systems,a model of a multi-beam satellite system with inter-beam is set up by introducing with interference factor.Then,a joint power bandwidth allocation algorithm is ...
SHI Yu,ZHANG Bangning,GUO Daoxing,YANG Liu
doaj  

Is an Apple an Orange? A Large Language Model Benchmark for Candidate Term Extraction and Subclass Decisions Against Upper Ontologies in Engineering and Materials Science

Advanced Engineering Materials, EarlyView.
Building machine‐readable vocabularies for materials science is slow, expert‐driven work. This study benchmarks 13 large language models on two of its first steps: finding candidate terms in engineering articles and deciding where they belong in a class hierarchy.
Thomas Bjarsch, Maximilian Holland, Klaus Drechsler, Johannes Schilp   +3 more
wiley   +1 more source

Radio resource allocation for multi‐antenna gateway stations of diverse NGSO constellation networks

IET Communications, 2022
With the rapid development of NGSO satellite constellation, multi‐antenna gateway station has become a trend to increase the capacity of communication system.
Zixuan Ren, Wei Li, Jin Jin, Yafeng Zhan
doaj   +1 more source

Robust Wideband DOA Estimation Based on Element-Space Data Reconstruction in a Multi-Source Environment

IEEE Access, 2021
In the presence of multiple sources, the performance of direction-of-arrival (DOA) estimation based on beam power maximization is susceptible to the energy leaking from the interference beams to the target beam, especially in the case that the signal of ...
Chuanqi Zhu, Shiliang Fang, Qisong Wu, Liang An, Xinwei Luo   +4 more
doaj   +1 more source

OntOMat: Toward Ontology‐Based Product and Process Design Engineering and Optimization Solutions Fueling Circular Value Chains

Advanced Engineering Materials, EarlyView.
The OntOMat ontology establishes a structured framework for polymer matrix fiber reinforced composite materials, integrating manufacturing processes, characterization methods, and multiscale design through the VDI/VDE 3682 formalized process description standard.
Nicolas Christ, Jörg Hohe, Martin Kördel, Michael Giese, Niklas Toffert, Christian Seidel, Olaf Rehme, Patrik Schneider, Oliver Focke, Elie Abi Aoun, Claas Falldorf, Beñat Gutierrez, Alexandra Kühn, Sven Torstrick-von der Lieth, Christoph Herden, Erik Johannsen, Jan‐Uwe R. Schmidt, Felix Winkelmann, Andreas Schott, Daniel Schott   +19 more
wiley   +1 more source

Uniform Amorphization of Crystalline Silicon Surfaces Enabled by Deep Ultraviolet Femtosecond Laser Pulses

Advanced Engineering Materials, EarlyView.
Deep‐UV (258 nm) femtosecond pulses enable uniform amorphous silicon writing on Si(100)/(111) with a six‐fold larger fluence amorphization window than NIR methods. Optimized fluence and overlap yield 20–45 nm uniform and continuous amorphous layers. Microscopy shows sharp interfaces, and real‐time reflectivity reveals nanosecond melt–resolidification ...
Wissal Benali, Magali Gregoire, Matys Guyard, Tatiana Itina, David Grojo, Pol Sopeña   +5 more
wiley   +1 more source

Improvement of Reflection/Transmission of Interference Structures: A Pilot Theoretical Simulation

Engineering Proceedings
Optical interference structures (OISs) are of particular interest due to their attractive potential for use in many practical applications involving laser light. They have many interesting properties, including the ability to smoothly tune the wavelength
Margarita Deneva, Maria Marinova
doaj   +1 more source

Study of interference localization using single satellite based on signal strength distribution in multi-beam antenna for satellite communications system

International Journal of Distributed Sensor Networks, 2018
Large onboard antennas with multi-beams are used almost in all the Geostationary Earth Orbit satellite communications systems, which are always disturbed by jams and inferences.
Chao He, Zhi-dong Xie, Dong-ming Bian, Xi-jian Zhong   +3 more
doaj   +1 more source

Downlink multi-user algorithms for millimeter-wave wideband linear arrays on PD-NOMA-based squint steering beams

EURASIP Journal on Advances in Signal Processing, 2021
This article investigates using a phased linear antenna array instead of the planar array to circumvent the problem that two frequency squint steering main beams cannot cover any two beam directions simultaneously.
Xiaoliang Pan, Luxi Yang
doaj   +1 more source