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Typical Applications for Computer Vision
Published in Ravi Das, Practical AI for Cybersecurity, 2021
In the world of Computer Graphics these “Padding” techniques are also known as “Wrapping or Texture Addressing Mode.” This helps to keep the pixel coordinates in the four borders of the 2-Dimensional or 3-Dimensional image from any further effects of darkening. But in the off chance that this does indeed happen, the “RBGA” color regime (as reviewed in detail earlier in this chapter) can have its “Alpha” values statistically computed so that this effect can be immediately terminated.
A three-dimensional DEM modelling of triaxial test on gas hydrate-bearing sediments considering flexible boundary condition
Published in Marine Georesources & Geotechnology, 2022
Shichen Zhou, Bo Zhou, Shifeng Xue
As shown in Figure 4, suppose that a particle is in contact with a wall facet that is wrapping a shell structural element surface. The locations of C and CP define the position of the contact point and the closest point on the wall facet to C, respectively. The force F and moment M at CP are calculated from the contact force F and moment M' at C by the principle of equivalent force systems. The force F and moment M exerting at CP are then used to calculate the equivalent force Fi (i = 1, 2, 3) at the wall facet vertex xi (i = 1, 2, 3) through the barycentric interpolation method in which the weighting factors are determined for each vertex by taking the triangular area opposite the vertex divided by the total area of the triangular. The resulting equivalent force Fi is subsequently passed to the appropriate shell structural element node x'i (i = 1, 2, 3). In response to the applied forces transferred from the facet vertices, the positions and velocities vi (i = 1, 2, 3) of shell structural element nodes are updated and in return reset the positions and velocities of the wall facet vertices according to that of the corresponding shell structural element nodes.
Experimental study of the effect of different backfilled soils on the stability of mechanically stabilized earth walls
Published in Journal of the Chinese Institute of Engineers, 2020
Wen-Yi Hung, Truong-Nhat-Phuong Pham, Chung-Chi Weng
The configuration of the SGREW models consisted of three parts: the foundation, the lower tier wall, and the upper tier wall. The foundation and the lower tier wall were constructed first, followed by the upper tier wall. The relative densities of the foundation soil and the tier walls of the sandy backfilled SGREW were also considered. After completion of the lower tier wall, several wooden boards, longer than those used for the lower tier wall, were piled vertically on top of a portion of the lower tier wall to produce the different offset distances. The purpose was to provide lateral support for the upper tier wall during construction. Again, the same construction process as for the lower tier wall was adopted to construct the upper tier wall. The length of wrapping in the top reinforcement layer of the upper tier wall was the same as the length of the reinforcement. A 20 mm layer of overburden soil was deposited on top to prevent pullout failure. Finally, the weight of the model was measured to check the relative density of the upper tier wall.
Effects of backpack weight on the performance of basic short-term/working memory tasks during flat-surface standing
Published in Ergonomics, 2019
Minseok Son, Soomin Hyun, Donghyun Beck, Jaemoon Jung, Woojin Park
For all three experiment tasks, behavioural, physiological and psychophysical response data, which were thought to be helpful in understanding the effects of backpack weight on STM/WM task performance, were collected from the participants during or after each task trial. Postural sway data were obtained using the force plate recordings of the centre of pressure (CoP) position-time profile during the 15 s of the standing task. The sampling frequency of the force plate was 100 Hz. The postural sway data did not include the measurements during the process of putting on and taking off the backpack. Among various postural sway measures, sway area, sway path and sway variance were employed in this study as they had been widely utilised in research studies (Albright and Woodhull-Smith 2009; Diener et al. 1984; Kerr, Condon, and McDonald 1985; Maylor, Allison, and Wing 2001; Panjan and Sarabon 2010; Rode, Tiliket, and Boisson 1997; Shumway-Cook and Woollacott 2000; Thapa et al. 1996). The three postural sway measures are described in Table 2. Sway area was calculated using the area of convex hull which is defined as the smallest polygon in which no internal angle exceeds 180 degrees and contains all sites of occurrence. The vertices of convex hull polygon were computed using the gift wrapping algorithm (Wollseifen 2011). For the sway variance, the medio-lateral (ML) and anterior-posterior (AP) directions were considered.