Zhenhai Shao

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A new computational algorithm, the discrete singular convolution (DSC), is introduced for solving scattering and guided wave problems described by time-domain MaxwellÕs equations. The DSC algorithm is utilized for the spatial discretization and the fourth-order Runge–Kutta scheme is used for the time advancing. Staggered meshes are used for electromagnetic(More)
—In this paper, a (2 4) scheme of the finite-difference time-domain (FDTD) method is proposed, in which the time differential is of the fourth order and the spatial differential using the discrete singular convolution is of order 2. Compared with the standard FDTD and the scheme of (4, 4), the scheme of (2 4) has much higher accuracy. By choosing a suitable(More)
This research focuses on trajectory generation algorithms that take into account the stealthiness of autonomous UAVs; generating stealthy paths through a region laden with enemy radars. The algorithm is employed to estimate the risk cost of the navigational space and generate an optimized path based on the user-specified threshold altitude value. Thus the(More)
This article reviews the relationship between the spinal dorsal ramus system and low back pain, including the anatomy, clinical findings, pathogenesis and treatment of low back pain mediated by spinal dorsal ramus and zygapophysial (facet) joint syndrome. Each spinal dorsal ramus arises from the spinal nerve and then divides into a medial and lateral(More)
Somatosensory evoked potentials (SEP) and sensory conduction velocity (SCV) were measured in rabbit sciatic nerves following graded cold lesioning. The SEP disappeared when injury was induced at temperatures below -60 degrees C, but returned on day 41+/-4 (mean+/-SD). SEP returned on day 56+/-11 days when the lesion was induced at 100 to -180 degrees C. The(More)