Results 11 to 20 of about 52,795 (103)

JWST observations of the Ring Nebula (NGC 6720): I. Imaging of the rings, globules, and arcs [Elektronisk resurs] [PDF]

, 2023
We present JWST images of the well-known planetary nebula NGC 6720 (the Ring Nebula), covering wavelengths from 1.6 to 25 m. The bright shell is strongly fragmented with some 20 000 dense globules, bright in H2, with a characteristic diameter of 0.2 ...
Zijlstra, A.,, Peeters, Els,, Sahai, R.,, McDonald, I.,, Aleman, I.,, Dinerstein, Harriet L.,, van Hoof, P. A. M.,, Kavanagh, Patrick,, Matsuura, Mikako,, Cami, Jan,, Wesson, R.,, Barlow, M. J.,, Bernard-Salas, J.,, Cox, N. L. J.,, García-Segura, G.,, Clark, Nicholas,, Kaplan, Kyle F.,, Volk, Kevin,, Manchado, Arturo,, Justtanont, Kay,, Van de Steene, G.,   +20 more
core   +2 more sources

Intelligent reflecting surface‐aided network planning

IET Communications, 2022
Intelligent reflecting surface (IRS) composed of a large number of low‐cost, phase‐adjustable passive reflecting elements, which is an attractive solution of overcoming the signal attenuation and interference.
Fan‐Hsun Tseng, Yu‐Shan Liang, Yen‐Wu Ti, Chia‐Mu Yu   +3 more
doaj   +1 more source

Biased Stackelberg game‐based UAV relay anti‐jamming communications: Exploiting trajectory optimization and transmission mode selection

IET Communications, 2022
Although unmanned aerial vehicle (UAV) relay can provide auxiliary communication due to its flexible mobility, it is vulnerable to jamming attacks. This paper considers the UAV relay anti‐jamming communication issue under the threat of a malicious jammer
Zhe Su, Qihui Wu, Nan Qi, Luliang Jia, Zhiyong Du   +4 more
doaj   +1 more source

Priority‐aware intelligent device access management for carbon footprint monitoring in sustainable cites and society

IET Communications, 2023
Carbon footprint monitoring provides significant basis for computing facilities to improve the computing efficiency and reduce the energy cost, which can enable low/zero carbon computing and facilitate the construction of sustainable cites.
Xiaoyu Su, Pengju Liu, Zhao Wang, Haijun Liao, Zhenyu Zhou, Guangyuan Xu, Zhenti Wang, Yan Qin   +7 more
doaj   +1 more source

Design and fabrication of a multilayer metamaterial antenna with high‐gain and good radiation patterns for WiFi and WiMAX applications

IET Communications, 2023
This paper proposes a metamaterial‐based multilayer antenna for WiFi and WiMAX applications. The multilayer structure is beneficial for achieving a gain of more than 15 dB.
Masood Fathipour, Loghman Asadpor
doaj   +1 more source

High level Petri nets‐based proposal of an integrated intrusion detection and prevention mechanism in network controlled systems

IET Communications, 2023
The authors’ work deals with modelling with coloured Petri nets (CPN) of network controlled systems (NCS) and exposes a proposal of a sensor fault detection and prevention mechanism. In NCS, the network must be viewed as part of the system and not just a
Khamsa Farah, Karim Chabir, Mohamed Naceur Abdelkrim   +2 more
doaj   +1 more source

A novel scheme based on information theory and transfer learning for multi classes motor imagery decoding

IET Signal Processing, 2023
The most important challenges of classifying Motor Imagery tasks based on the EEG signal are low signal‐to‐noise ratio, non‐stationarity, and the high subject dependence of the EEG signal.
Jaber Parchami, Ghazaleh Sarbishaei
doaj   +1 more source

Vowel classification with combining pitch detection and one‐dimensional convolutional neural network based classifier for gender identification

IET Signal Processing, 2023
Human speech signals may contain specific information regarding a speaker's characteristics, and these signals can be very useful in applications involving interactive voice response (IVR) and automatic speech recognition (ASR).
Chia‐Hung Lin, Hsiang‐Yueh Lai, Ping‐Tzan Huang, Pi‐Yun Chen, Chien‐Ming Li   +4 more
doaj   +1 more source

Handheld Digital TV Performance Evaluation Method

International Journal of Digital Multimedia Broadcasting, 2008
This paper presents a simplified method for signal level clearance evaluation in each place of signal reception up to threshold for a given portable TV receiver device.
Gunnar Bedicks, Fujio Yamada, Francisco Sukys, Cristiano Akamine, Luis Tadeu Raunheitte, Edson L. Horta   +5 more
doaj   +1 more source

Spatial multiplexing in near field MIMO channels with reconfigurable intelligent surfaces

IET Signal Processing, 2023
We consider a multiple‐input multiple‐output (MIMO) channel in the presence of a reconfigurable intelligent surface (RIS). Specifically, our focus is on analysing the spatial multiplexing gains in line‐of‐sight and low‐scattering MIMO channels in the ...
Giulio Bartoli, Andrea Abrardo, Nicolo Decarli, Davide Dardari, Marco Di Renzo   +4 more
doaj   +1 more source