International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The article The article describes a simulation experiment to assess human behavior during threats inside buildings, using Metaverse systems and virtual reality (VR). The study was carried out on a model of a real building, where avatars controlled by users simulated responses to crises. This approach has several advantages over the traditional use of NPCs (non-player characters). Usercontrolled avatars enable a more realistic representation of behavior, as participants can make decisions in real time depending on the developing situation. Unlike NPCs, whose reactions are pre-programmed and predictable, human-controlled interactions introduce an element of unpredictability and authenticity, better reflecting real human reactions. Thanks to Metaverse and VR systems, it is possible to precisely reproduce building interiors and threat scenarios, which allows for analyzing various evacuation strategies and behaviors in stressful situations. In addition, experiment participants can repeatedly participate in various simulations, which increases the scope of collected data and allows for a more comprehensive analysis. The article emphasizes that using Metaverse and VR systems for simulations with users brings significant benefits to research on security and crisis management. This approach allows for the creation of more realistic models of human behavior, which are key to improving evacuation procedures and responses to threats inside buildings. The study presents the results of research carried out based on an original solution implemented in the Metaverse environment.

In the presented paper is examined the need for digitalization of cultural and historical sites. Approaches for 3D digitalization by using 3D scanners and photogrammetry are presented. A 3D printing of digitalized objects is accomplished. The photogrammetry method is examined and used as a possible solution for the digitalization and creation of 3D models. The models can be explored by visually impaired people. A monument from the Cultural and Historical site of Bulgaria is 3D digitalized and 3D printed by using a drone, photogrammetry software, and 3D printer.

The ability of a person to move quickly plays an important role in the modern, constantly accelerating world. Despite the good development of the infrastructure of large cities, a significant part of its population uses underground or ground public transport, mixing daily trips on it with walking. That is the only one fact, where the importance of the process of walking in the life of modern man can be noticed. There is a new method for evaluation of therapeutical rehabilitation complex work for human lower limbs motion recovery is introduced. Simple mathematical basis and ethalon criterias for rehabilitation complex prototype efficency control are shown.