Results 51 to 60 of about 1,800 (293)

Dual Quaternion-Based Dynamic Modeling and Adaptive Neural Identification for Load-Assist Exoskeletons

IEEE Access
This article addresses the challenge of modeling and controlling load-assist exoskeletons operating under dynamic and uncertain conditions. Traditional approaches often rely solely on dual quaternions for kinematic modeling, limiting their applicability ...
Angel Eduardo Zamora-Suarez, Fermin Castillo Anaya, Pamela Patricia Vera-Tizatl, Rosalio Reyes   +3 more
doaj   +1 more source

Helmert Transformation Problem. From Euler Angles Method to Quaternion Algebra

ISPRS International Journal of Geo-Information, 2020
The three-dimensional coordinate’s transformation from one system to another, and more specifically, the Helmert transformation problem, is one of the most well-known transformations in the field of engineering.
Stefania Ioannidou, George Pantazis
doaj   +1 more source

Adjunctive Therapeutic Plasma Exchange in Refractory Adult‐Onset Still's Disease Complicated by Secondary Macrophage Activation Syndrome: A Single‐Center Experience

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Introduction Adult‐onset Still's disease (AOSD) complicated by macrophage activation syndrome (MAS) carries substantial mortality. The role of therapeutic plasma exchange (TPE) remains uncertain. Methods We retrospectively analyzed patients with AOSD‐MAS treated with TPE at a single‐center.
Masataka Ueda, Tomohiro Saito, Masahide Mizobuchi, Tomoki Shimomura, Saki Kawamori, Mitsuru Kawanishi, Natsuko Hattori, Jo Sugiyama, Satoshi Tsubata, Hanami Horiguchi, Kazuki Abe, Nao Iida, Yuki Kajio, Nao Oguro, Ryo Yanai, Hirokazu Honda   +15 more
wiley   +1 more source

Simultaneous Calibration of the Hand-Eye, Flange-Tool and Robot-Robot Relationship in Dual-Robot Collaboration Systems

Sensors, 2022
A multi-robot collaboration system can complete more complex tasks than a single robot system. Ensuring the calibration accuracy between robots in the system is a prerequisite for the effective inter-robot cooperation.
Yanding Qin, Pengxiu Geng, Bowen Lv, Yiyang Meng, Zhichao Song, Jianda Han   +5 more
doaj   +1 more source

Reciprocal control of viral infection and phosphoinositide dynamics

FEBS Letters, EarlyView.
Phosphoinositides, although scarce, regulate key cellular processes, including membrane dynamics and signaling. Viruses exploit these lipids to support their entry, replication, assembly, and egress. The central role of phosphoinositides in infection highlights phosphoinositide metabolism as a promising antiviral target.
Marie Déborah Bancilhon, Bruno Mesmin
wiley   +1 more source

Research on the rigid body pose estimation using dual quaternions

Advances in Mechanical Engineering, 2019
The dual quaternion is the simplest and most effective mathematical tool to describe the translational and rotational motion of a general rigid body. Its computation and updating require screw vector. The relative pose information need to be updated when
Jing Li
doaj   +1 more source

Some Results On Quaternion 3-Space

Cumhuriyet Science Journal, 2018
In this paper, the set J′=H(Q₄,Jγ) of 4 by 4 matrices, withentries in a quaternion F-algebra Q, that are symmetric with respect to thecanonical involution Jγ is studied.
Atilla Akpınar, Fatma Özen Erdoğan
doaj   +1 more source

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source

Dual-quaternion-based iterative algorithm of the three dimensional coordinate transformation

Earth, Planets and Space
Nowadays a unit quaternion is widely employed to represent the three-dimensional (3D) rotation matrix and then applied to the 3D similarity coordinate transformation.
Huaien Zeng, Zhihao Wang, Junfeng Li, Siyang Li, Junjie Wang, Xi Li   +5 more
doaj   +1 more source

Improved time and frequency synchronization for dual‐polarization OFDM systems

ETRI Journal, 2021
This article presents techniques for improved estimation of symbol timing offset (STO) and carrier frequency offset (CFO) for dual‐polarization (DP) orthogonal frequency division multiplex (DP‐OFDM) systems.
José Luis Hinostroza Ninahuanca, Osmar Tormena, Luís Geraldo Pedroso Meloni   +2 more
doaj   +1 more source