Results 51 to 60 of about 10,056 (178)

Diagnostic Performance of Ultrasound in Adult Appendicitis. A Retrospective Review of 331 Cases

Journal of Medical Radiation Sciences, EarlyView.
The sensitivity of ultrasound in the detection of appendicitis had a prevalence of 16% in our predominantly young female cohort, with alternative gynaecological and abdominal diagnoses identified approximately 2:1. The sensitivity for ultrasound to detect appendicitis was 60%, with specificity of 98% and negative predictive value (NPV) of 93%.
Alistair Lock, Martin Necas
wiley   +1 more source

Joint Noniterative Beamforming Schemes for BER Minimization in Next-Generation Wireless Sensor Networks

Journal of Electrical and Computer Engineering
This research paper proposes three joint transmit and receive (TX/RX) beamforming schemes for minimizing the bit error rates of next-generation wireless sensor networks. Based on minimizing the optimization problem of the total mean squared error between
Mohamed S. Abouzeid, Heba A. El-Khobby, Mahmoud A. A. Ali, Mohamed E. Nasr   +3 more
doaj   +1 more source

A 5G NR FR2 Beamforming System with Integrated Transceiver Module

Sensors
This paper presents a 5G new radio (NR) FR2 beamforming system with an integrated transceiver module. A real-time operating module providing enhanced flexibility and capability has been proposed.
Ayush Bhatta, Md Kamrojjaman, Sanghoon Sim, Jeong-Geun Kim   +3 more
doaj   +1 more source

Liver Stiffness Characterization of OGTLKO Mouse Model of Progressive Liver Fibrosis

Journal of Ultrasound in Medicine, EarlyView.
Objectives O‐GlcNAcylation plays a key regulatory role in hepatic physiology, and its disruption leads to fibrosis in liver‐specific OGT knockout mice (OGTLKO), making this model valuable for studying advanced metabolic dysfunction‐associated steatohepatitis (MASH).
Gilles Renault, Lenin Chinchilla, Lourdes Massengo, Pierre Monbernard, Fadila Benhamed, Marion Regnier, Raphael Denis, Catherine Postic, Anthony Novell, Jean‐Luc Gennisson   +9 more
wiley   +1 more source

Low Complexity and Robust Codebook-Based Analog Beamforming for Millimeter Wave MIMO Systems

IEEE Access, 2017
Millimeter-wave (mm-Wave) MIMO systems have been proposed to achieve higher spectral efficiency via the hybrid beamforming structure, which consists of analog beamforming and digital beamforming.
Yong Niu, Ziqi Feng, Min Chen, Yong Li, Zhangdui Zhong, Bo Ai   +5 more
doaj   +1 more source

Topological Photonic Devices and Circuits at Terahertz Frequencies

Laser &Photonics Reviews, EarlyView.
This review examines how 3D topological insulators and emerging topological photonic phases enable robust, low‐loss and defect‐immune terahertz devices. Fundamental properties, device implementations and topological transport mechanisms are surveyed, revealing new opportunities for reconfigurable, high‐performance THz components and scalable ...
Samane Kalhor, Srabani Kar, Ranjan Singh, Kaveh Delfanazari   +3 more
wiley   +1 more source

Location‐Assisted Graph‐Based User Scheduling in Multi‐User MIMO LEO NTN Systems

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT This paper addresses user clustering and scheduling for multi‐user MIMO low Earth orbit nonterrestrial network systems in full frequency reuse. Since the number of on‐ground user terminals is usually much higher than the number of on‐board LEO satellite antennas, user scheduling becomes a fundamental task.
Bilal Ahmad, Daniel Gaetano Riviello, Bruno De Filippo, Alessandro Guidotti, Alessandro Vanelli‐Coralli   +4 more
wiley   +1 more source

Holographic Beamforming

, 2023
This chapter presents the fundamentals of the holography technique to form the beam in electromagnetic (EM) structures. The application of holography in leaky-wave antennas, metasurface reflectors, and reconfigurable intelligent surfaces (RISs) is explained. Consequently, different methods to analyze and realize an EM hologram are presented.
Ali, Araghi,, Mohsen, Khalily,
openaire   +2 more sources

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

Digital Twin‐Based Optimization of Service Availability in LEO Mega Constellations Considering Handover Delays in Open RAN

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT As non‐terrestrial networks (NTNs) become integral to future 6G systems, ensuring seamless connectivity and service continuity over low Earth orbit (LEO) satellite constellations is essential. This work investigates the impact of open radio access network (RAN) functional splits on handover performance in NTNs, focusing on minimizing service ...
Siva Satya Sri Ganesh Seeram, Luca Feltrin, Mustafa Ozger, Cicek Cavdar   +3 more
wiley   +1 more source