Abstracts / Poster Presentations Book of Abstracts of DECT-2023 Posters: Kateryna Stiepanova, Daryna Shevchuk. Localization of a solution to a mixed problem of PDE. Oleh Vozniak, Valery Korobov. Return condition for oscillating systems with constrained positive control. Mykyta Sobur, Sergii Poslavskyi. Modelling of the wave dynamics in a system for rope jumping and free falling.