109 research outputs found
A Delay Compensation Framework Based on Eye-Movement for Teleoperated Ground Vehicles
An eye-movement-based predicted trajectory guidance control (ePTGC) is
proposed to mitigate the maneuverability degradation of a teleoperated ground
vehicle caused by communication delays. Human sensitivity to delays is the main
reason for the performance degradation of a ground vehicle teleoperation
system. The proposed framework extracts human intention from eye-movement.
Then, it combines it with contextual constraints to generate an
intention-compliant guidance trajectory, which is then employed to control the
vehicle directly. The advantage of this approach is that the teleoperator is
removed from the direct control loop by using the generated trajectories to
guide vehicle, thus reducing the adverse sensitivity to delay. The delay can be
compensated as long as the prediction horizon exceeds the delay. A
human-in-loop simulation platform is designed to evaluate the teleoperation
performance of the proposed method at different delay levels. The results are
analyzed by repeated measures ANOVA, which shows that the proposed method
significantly improves maneuverability and cognitive burden at large delay
levels (>200 ms). The overall performance is also much better than the PTGC
which does not employ the eye-movement feature.Comment: 9 pages, 11 figure
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Agriculture Non-Point Source Phosphorus Loss Risk Assessment In Yellow River Basin By Modified Phosphorus Index
Effects of sodium creatine phosphate on myocardial and left ventricular function in patients with slow / no reflow acute ST segment elevation myocardial infarction during percutaneous coronary intervention
Objective: To investigate the effect of sodium creatine phosphate on myocardial and left ventricular function in patients with slow / no reflow acute ST segment elevation myocardial infarction (STEMI) during percutaneous coronary intervention (PCI). Methods: The incidence of major adverse cardiovascular events (heart failure, recurrent myocardial infarction, malignant arrhythmia, cardiac arrest, cardiogenic shock, etc.) Was recorded and compared between the two groups. Results: Conclusion sodium creatine phosphate can reduce myocardial injury, improve heart rate variability and left ventricular function, and reduce the risk of major adverse cardiovascular events in STEMI patients with slow / no reflow during PCI
HDAC3 is crucial in shear- and VEGF-induced stem cell differentiation toward endothelial cells
Reendothelialization involves endothelial progenitor cell (EPC) homing, proliferation, and differentiation, which may be influenced by fluid shear stress and local flow pattern. This study aims to elucidate the role of laminar flow on embryonic stem (ES) cell differentiation and the underlying mechanism. We demonstrated that laminar flow enhanced ES cell–derived progenitor cell proliferation and differentiation into endothelial cells (ECs). Laminar flow stabilized and activated histone deacetylase 3 (HDAC3) through the Flk-1–PI3K–Akt pathway, which in turn deacetylated p53, leading to p21 activation. A similar signal pathway was detected in vascular endothelial growth factor–induced EC differentiation. HDAC3 and p21 were detected in blood vessels during embryogenesis. Local transfer of ES cell–derived EPC incorporated into injured femoral artery and reduced neointima formation in a mouse model. These data suggest that shear stress is a key regulator for stem cell differentiation into EC, especially in EPC differentiation, which can be used for vascular repair, and that the Flk-1–PI3K–Akt–HDAC3–p53–p21 pathway is crucial in such a process
Chemical ordering suppresses large-scale electronic phase separation in doped manganites
For strongly correlated oxides, it has been a long-standing issue regarding the role of the chemical ordering of the dopants on the physical properties. Here, using unit cell by unit cell superlattice growth technique, we determine the role of chemical ordering of the Pr dopant in a colossal magnetoresistant (La1-yPry)1-xCaxMnO3 (LPCMO) system, which has been well known for its large length-scale electronic phase separation phenomena. Our experimental results show that the chemical ordering of Pr leads to marked reduction of the length scale of electronic phase separations. Moreover, compared with the conventional Pr-disordered LPCMO system, the Pr-ordered LPCMO system has a metal–insulator transition that is ~100 K higher because the ferromagnetic metallic phase is more dominant at all temperatures below the Curie temperature
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