English Classroom Immersive Teaching Based on Digital Twin Technology

In order to improve the effect of English classroom teaching, this paper builds an immersive teaching model of English classroom based on digital twin technology. Moreover, in order to reduce the cost of the system, simplify the system structure, and enable learners to observe the stereoscopic display image with the naked eye, this paper builds an immersive hemispherical projection teaching system, designs the overall structure of the system and various components of the hardware, and studies the projection image predistortion algorithm. In addition, this paper uses the immersive experience between virtual reality technology and immersive teaching as a connection point to design an immersive teaching based on VR and apply it to teaching practice to test the effect of immersive teaching, and perfect the immersive teaching design model based on VR. Finally, this paper designs an experiment to verify and analyze the performance of the system. From the experimental results, it can be seen that the English classroom immersive teaching model based on digital twin technology constructed in this paper is effective.

Regarding a certain type of coin-shaped pendants

The article is devoted to the consideration of the symbolism and sacred content of a special kind of coin-shaped pendants, which are made of non-ferrous metals, decorated with twelve convex dots around the perimeter, and in the center have a hemispherical projection or hexagonal figure. Collection of such pendants is small and consists of single finds, mostly found in barrows and settlements of Early Middle Ages. For the first time, issue of interpretation of coin-shaped pendants was raised more than twenty years ago, after which the number of materials increased substantially due to the finds not only from the lands of Belarus but also from adjacent countries. Territory of their distribution includes southern and central Belarus and northwestern regions of Ukraine. Separate finds have also been made in Polish Podlasze, Eastern Lithuania and Southern Latvia. This area does not coincide with the lands of any particular union of East Slavic tribes, but pendants of this type are often found on sites, materials of which include characteristic temporal jewelry of Dregovichi type, decorated with granulation. Based on nature of associated finds, pendants of this type were in use in XII –first half of XIII century. Therefore, they appeared probably in XI century. Little number of pendants mentioned above for a relatively large area may indicate that these products were aimed for a quantitatively small population. These pendants occurred both in relatively rich burials and in feudal estates, which confirms the high status of their owners. Chronology of pendants is coincides with bi-religion period, and there is no clear evidence of Christian affiliation of persons buried with them. Sites on which pendants were found are examined, if it is possible, ethno-deterministic decorations found there are also emphasized, and the area of distribution of the pendants of mentioned type is outlined at the publication. Find of such pendant in one of the burials in Lithuania, along with coin of the late XIV century is essential for determining of the chronology of the use of these products. The analogies among finds of pre-Christian era are indicated, that witnesses thee origins of mentioned symbolism among the pagan antiquities. Semantics of both number “12” and the hexagon in the center of the pendant are analyzed, and on this basis conclusion is made about astronomical-calendar symbolism of the identified objects. Sites on which pendants were found are examined, if it is possible, ethno-deterministic decorations found there are also emphasized, and the area of distribution of the pendants of mentioned type is outlined at the publication. Find of such pendant in one of the burials in Lithuania, along with coin of the late XIV century is essential for determining of the chronology of the use of these products. The analogies among finds of pre-Christian era are indicated, that witnesses thee origins of mentioned symbolism among the pagan antiquities. Semantics of both number “12” and the hexagon in the center of the pendant are analyzed, and on this basis conclusion is made about astronomical-calendar symbolism of the identified objects. Key words: coin-shaped pendants, Dregovichi type granulated beads, sacral number 12, hexagon symbols.

Four-Channel 3D Around View Monitoring Algorithm Using Hemispherical Projection Model

Most current vehicle black boxes provide a bird’s-eye view of 2D type. This viewpoint has a limited viewing angle which makes it difficult to conduct an accident investigation, parking and awareness of space. To solve these problems, we propose the 3D Around View Monitoring (AVM) algorithm using image composition which combines planar and hemispherical projection method. The experimental results indicate that the proposed method overcome the 2D AVM disadvantages and may be useful for accurate accident investigation, autonomous driving system and other system.