Theory Of Wing Sections Including A Summary Of Airfoil Data

Concise deep reinforcement learning obstacle avoidance for underactuated unmanned marine vessels

The development of magnetic field sensors for biomedical applications primarily focuses on equivalent magnetic noise reduction or overall design improvement in order to make them smaller and cheaper while keeping the required values of a limit of detection. One of the cutting-edge topics today is the use of magnetic field sensors for applications such as magnetocardiography, magnetotomography, magnetomyography, magnetoneurography, or their application in point-of-care devices. This introductory review focuses on modern magnetic field sensors suitable for biomedicine applications from a physical point of view and provides an overview of recent studies in this field. Types of magnetic field sensors include direct current superconducting quantum interference devices, search coil, fluxgate, magnetoelectric, giant magneto-impedance, anisotropic/giant/tunneling magnetoresistance, optically pumped, cavity optomechanical, Hall effect, magnetoelastic, spin wave interferometry, and those based on the behavior of nitrogen-vacancy centers in the atomic lattice of diamond.

Ultrasensitive Magnetic Field Sensors for Biomedical Applications.

In this paper, a dynamic model of a wheeled mobile robotic (WMR) system with coupled control input is developed, which will increase the complexity of its tracking control with time-varying advance angle. To deal with this problem, a partial reinforcement learning neural network (PRLNN)-based tracking algorithm is proposed for the WMR systems. The main contributions of the PRLNN adaptive tracking control method is that it is the first control method to introduce the PRLNN adaptive control to the WMR system, which determines to solve the WMR tracking control with the time-varying advance angle. The critic neural network (NN) and action NN adaptive laws for the decoupled controllers are designed using the standard gradient-based adaptation method. According to the Lyapunov stability analysis theorem, the uniform ultimate boundedness of all signals in the WMR system can be guaranteed with the design parameters chose properly, and the tracking error converge to a small compact set nearby zero. A numerical simulation is presented to verify the effectiveness of the proposed control algorithm.

Adaptive Partial Reinforcement Learning Neural Network-Based Tracking Control for Wheeled Mobile Robotic Systems

Otolithic afferents with regular resting discharge respond to gravity or low frequency linear accelerations, and we term these the static or sustained otolithic system. However in the otolithic sense organs there is anatomical differentiation across the maculae and corresponding physiological differentiation. A specialized band of receptors called the striola consists of mainly type I receptors whose hair bundles are weakly tethered to the overlying otolithic membrane. The afferent neurons which form calyx synapses on type I striolar receptors have irregular resting discharge and have low thresholds to high frequency (e.g. 500Hz) bone conducted vibration and air conducted sound. High frequency sound and vibration likely causes fluid displacement which deflects the weakly tethered hair bundles of the very fast type I receptors. Irregular vestibular afferents show phase locking, similar to cochlear afferents, up to stimulus frequencies of kilohertz. We term these irregular afferents the transient system signalling dynamic otolithic stimulation. 500Hz vibration preferentially activates the otolith irregular afferents, since regular afferents are not activated at intensities used in clinical testing whereas irregular afferents have low thresholds. We show how this sustained and transient distinction applies at the vestibular nuclei. The two systems have differential response to vibration and sound, to ototoxic antibiotics, to galvanic stimulation and to natural linear acceleration, and such differential sensitivity allows probing of the two systems. 500Hz vibration which selectively activates irregular otolithic afferents results in stimulus-locked eye movements in animals and humans. The preparatory myogenic potentials for these eye movements are measured in the new clinical test of otolith function – ocular vestibular evoked myogenic potentials. We suggest 500Hz vibration may identify the contribution of the transient system to vestibular controlled responses such as vestibulo-ocular, vestibulo-spinal and vestibulo-sympathetic responses. The prospect of particular treatments targeting one or the other of the transient or sustained systems is now being realized in the clinic by the use of intratympanic gentamicin which preferentially attacks type I receptors. We suggest that it is valuable to view vestibular responses by this sustained-transient distinction.

/pdf/sustained-and-transient-vestibular-systems-a-physiological-1eus11pa4a.pdf

Sustained and Transient Vestibular Systems: A Physiological Basis for Interpreting Vestibular Function.

The invention relates to a sonar image splicing method. The method comprises the steps of removing noise in order to increase the contrast ratio through image preprocessing; transforming a scaling parameter and a rotation parameter into translation parameters through carrying out log-polar transformation to an image amplitude frequency spectrum, and carrying out algorithm analysis based on phase correlation; filtering scale and rotation factors through image geometric transformation; working out the translation parameters through an algorithm based on the phase correlation; and carry out coordinate mapping through the scaling parameter, the rotation parameter and the translation parameters which are worked out, and carrying out image interpolation through a bilinear interpolation algorithm. The registration of all sonar images is achieved by continuously repeating the above steps, then the splicing of the sonar images is achieved through brightness adjustment and image superposed area fusion. According to the invention, the problem that the detection scope visual angle of sonar is narrow in an underwater monitoring process is solved, through sonar image splicing, a series of sonar images are spliced to a large-scale sonar image, and therefore the sonar can simultaneously monitor a large-scale underwater environment.

Sonar image splicing method

Among the shortcomings of the A* algorithm, for example, there are many search nodes in path planning, and the calculation time is long. This article proposes a three-neighbor search A* algorithm c...

https://journals.sagepub.com/doi/pdf/10.1177/17298814211026449

Research on path planning of three-neighbor search A* algorithm combined with artificial potential field:

Existing commodity RGB-D sensors have a limited field of view compared with a nearly 360° horizontal field of view of Lidar. This article presents a method to extend the field of view by stitching ...

https://journals.sagepub.com/doi/pdf/10.1177/1729881419851665

Stitching of depth and color images from multiple RGB-D sensors for extended field of view

In this paper, classified theoretical models, consisting of contact with and placement of microsphere and picking operations, are simplified and established to depict the interactive behaviors of external and internal forces in pushing manipulations, respectively. Sliding and/or rolling cases, resulting in the acceleration of micromanipulations, are discussed in detail. Effective contact detection is achieved by combining alterations of light-shadow and relative movement displacement between the tip-sphere. Picking operations are investigated by typical interactive positions and different end tilt angles. Placements are realized by adjusting the proper end tilt angles. These were separately conducted to explore the interactive operations of nonconductive glass microspheres in a scanning electron microscope. The experimental results demonstrate that the proposed contact detection method can efficiently protect the end-tip from damage, regardless of operator skills in initial positioning operations. E-beam irradiation onto different interactive positions with end tilt angles can be utilized to pick up microspheres without bending the end-tip. In addition, the results of releasing deviations away from the pre-setting point were utilized to verify the effectiveness of the placement tilt angles.

https://www.mdpi.com/2072-666X/8/8/257/pdf

Interactive Micromanipulation of Picking and Placement of Nonconductive Microsphere in Scanning Electron Microscope

This article presents a sea-sky-line detection algorithm in a sea-sky environment for unmanned surface vehicles. Obstacle detection is a vital branch for unmanned surface vehicles on the ocean. Bec...

https://journals.sagepub.com/doi/pdf/10.1177/1729881419892116

Hengyu Li

Papers

Sonar image splicing method

Research on path planning of three-neighbor search A* algorithm combined with artificial potential field:

Stitching of depth and color images from multiple RGB-D sensors for extended field of view

Interactive Micromanipulation of Picking and Placement of Nonconductive Microsphere in Scanning Electron Microscope

A sea-sky-line detection method based on Gaussian mixture models and image texture features: