Assessment of UAV's Operator Cognitive State Based on Behavior Signals

Abstract

For exploring the relationship between the mental or cognitive state and metric of vigilance test for unmanned aerial vehicle (UAV), a vigilance state evaluation method and sphere of application based on behavior signals is established. A classical vigilance test avoiding to crash is set. During the experiments, the subjective ratings as well as behavior signals (Response Time, Lapse) are recording. The dynamic changing of behavior signals is analyzed using statistical analysis. The results demonstrate that compared with continuous PVT test, the subject's mental workload in rest PVT test decreases dramatically. Compared other metrics, the speed of response time can reflect the dynamic changing of subject's mental state. The metric of Q-50 has a strong robustness for outlier of subject. Considering that the metrics have strong correlation with operator's cognitive state, they can effectively analyze the different workload.

Influence of Novel Electromagnetic Strengthening on Mechanical Properties of Spaceborne Elastic Components

“…In addition to the magnetic field, the electrical pulse also has the effect of refining the grains. He Shuxian [40] used Maxwell's equation to deduce the shear stress generated by the electric pulse, which cuts long rod-shaped crystals into small bulk crystals.…”

“…Under the action of the electromagnetic field, the refined grains have the following four influences on the matrix. (i) The proportion of grain boundaries improves the resistance to dislocation, which acts as a drag on plastic deformation [40]. As a result, the strength and hardness are enhanced.…”

“…Numerous grain boundaries can hinder the initiation and propagation of cracks effectively. (ii) The finer grains generate more different orientations around each grain, especially the hard orientations, which increases the resistance to deformation [40]. Therefore, the strength and hardness are improved; (iii) The refined grains reduce the normal stress generated by the dislocation stacking, and the stress concentration is alleviated, which requires a larger force to increase the stress.…”

“…As a result, the material can bear more deformation without fractures. The plasticity is enhanced [40]. Due to the above reasons, the stiffness, hardness, and other properties of the spring have been improved integrally.…”

Studies on the Selective S-oxidation of Albendazole, Fenbendazole, Triclabendazole, and Other Benzimidazole Sulfides

“…Methyl [5-(phenylsulfinyl)-1H-benzimidazol-2-yl]carbamate (6).Following the general procedure, 2 (0.5 g, 1.67 mmol) in 13 mL of AcOH/CH 3 CN and NaIO 4 (0.393 g, 1.84 mmol) in 6 mL of H 2 O/AcOH (5:2) were stirred at 15ºC5-(Propylsulfinyl)-2-(trifluoromethyl)-1H-benzimidazole(11). Following the general procedure, 10 (0.40 g, 1.54 mmol) in 8 mL of AcOH/CH 3 CN and NaIO 4 (0.328 g, 1.69 mmol, 1.09 eq.)…”