Results 61 to 70 of about 5,815,781 (251)

Physical Layer Security in Uplink NOMA Multi-Antenna Systems With Randomly Distributed Eavesdroppers

IEEE Access, 2019
The physical layer security of uplink non-orthogonal multiple access (NOMA) is analyzed. A stochastic geometry approach is applied to analyze the coverage probability and effective secrecy throughput (EST) of the kth NOMA user, where a fixed or an ...
Gerardo Gomez, Francisco J. Martin-Vega, F. Javier Lopez-Martinez, Yuanwei Liu, Maged Elkashlan   +4 more
doaj   +1 more source

On‐Skin Wireless Vibratory Interfaces by Stretchable Multilayer Circuits

Advanced Materials Interfaces, EarlyView.
A battery‐free, stretchable wireless vibratory interface is developed through printable liquid‐metal‐based multilayer circuits. The soft device integrates wireless power reception, signal modulation, and vibrotactile actuation within a compliant platform.
Jiawei Liu, Yanfeng Hou, Shengkang Fu, Maoxin Yang, Hongbiao Sun, Yi Huang, ZhiBo Wang, Xiqiang Luo, Chengliang Tao, Qing Tang, Jiangxin Wang   +10 more
wiley   +1 more source

Secure Transmission for Simultaneous Wireless Information and Power Transfer in AF Untrusted Relay Networks

Sensors, 2018
This paper investigates secure communications of energy harvesting untrusted relay networks, where the destination assists jamming signal to prevent the untrusted relay from eavesdropping and to improve the forwarding ability of the energy constrained ...
Hui Shi, Weiwei Yang, Dechuan Chen, Yunpeng Luo, Yueming Cai   +4 more
doaj   +1 more source

Large‐Scale and Cost‐Effective Fabrication of Ultra‐Thin, Biodegradable Microelectrode Arrays and Pressure Sensors Using Laser Micromachining

Advanced Materials Technologies, EarlyView.
A mask‐free and cost‐effective UV‐pico‐second laser‐based microfabrication method is proposed to fabricate large‐area biodegradable microelectrode arrays and pressure sensors. These devices demonstrate low impedance, good conformability, excellent biocompatibility, and rapid degradation, providing a new route for next‐generation transient electronics ...
Bhavani Prasad Yalagala, Asfand Tanwear, María Cerezo‐Sánchez, Hossein Parvizi, Morteza Amjadi, Hadi Heidari   +5 more
wiley   +1 more source

Enhancing Physical Layer Security in IoT-Based RF-FSO Integrated Networks: Multi-RIS Structures and Their Impact on Secure Communication

IEEE Open Journal of the Communications Society
Due to their ability to dynamically control the propagation environment, reconfigurable intelligent surfaces (RISs) offer a promising solution to address the challenges of 6G wireless communication, especially in the context of Internet of Things (IoT ...
Anika Tabassum Biva, MD. Ibrahim, A. S. M. Badrudduza, Imran Shafique Ansari, Sumit Chakravarty, Imtiaz Ahmed   +5 more
doaj   +1 more source

In Situ Formation of Ni‐P‐O‐C Interfaces in DLP‐Printed Carbon Microlattices for Efficient Alkaline Hydrogen Evolution

Advanced Materials Technologies, EarlyView.
Graphical abstract illustrating the fabrication of Ni–P–O–C porous carbon microlattice electrodes by DLP printing of Ni/P precursor‐containing resin followed by high‐temperature carbonization. The resulting conductive microlattice acts directly as the HER cathode in alkaline electrolyte, where in situ formed Ni–P–O–C interfaces provide active sites for
Muzahir Ali, Seongmin Lee, Tasadduq Hussain, Young Kyu Kim, Md. Ali Asgar, Jung Bin In, Seok‐min Kim   +6 more
wiley   +1 more source

Physical Layer Security in an Untrusted Energy Harvesting Relay Network

IEEE Access, 2019
The security performance in an amplify-and-forward dual-hop untrusted relay network is considered. It is assumed that the source and multiple destinations are equipped with multiple antennas, and the information transmission is aided by a single-antenna ...
Hui Shi, Yueming Cai, Dechuan Chen, Jianwei Hu, Weiwei Yang, Wendong Yang   +5 more
doaj   +1 more source

Two‐Step Thermal Upcycling of Flexible Printed Circuit Board Waste Into Metallic Copper Nanoparticles: Synthesis and Characterization

Advanced Materials Technologies, EarlyView.
A two‐step thermal upcycling process converts flexible printed circuit board waste into high‐purity copper nanoparticles using polymer degradation and arc discharge. The synthesized nanoparticles exhibit controlled morphology and high metal purity.
Bikesh S. Ghinangju, Rumana Hossain, Veena Sahajwalla   +2 more
wiley   +1 more source

Secrecy Throughput of Wireless Interference Networks with Uncertain Channel State Information

, 2017
Considering a multi-user interference network with an eavesdropper, this paper investigates the problem of power allocation to optimize the worst secrecy throughput among the network links.
Poor, HV, Hoang, TD, Sheng, Z, Nasir, AA
core   +2 more sources

Secrecy Rate Maximizing Beamforming Schemes for the DF Relay Wiretap Channels

IEEE Access, 2018
We consider beamforming schemes for the multi-antenna decode-and-forward (DF) relays that maximize the secrecy rate (SR) in the relay wiretap channel. Both full-duplex (FD) and half-duplex (HD) relays are considered, where the FD relay fights the loop ...
Duckdong Hwang, Janghoon Yang, Eunchul Yoon, Hyoung-Kyu Song, Sung Sik Nam   +4 more
doaj   +1 more source