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The impact of vehicle traffic volume on pedestrian behavior at unsignalized crosswalks

Fornalchyk Yevhen, Koda Eugeniusz, Kernytskyy Ivan, Hrytsun Oleh, Royko Yuriy, Bura Romana, Osiński Piotr, Barabash Ruslan, Humenuyk Ruslan, Polyansky Pavlo

Roads and Bridges - Drogi i Mosty

2023

Vol. 22, no. 2

201--219

The research is focused on analyses of vehicle delays caused by pedestrian crosswalks on one-way streets. The study encompassed three particular locations of unsignalized crosswalks: on the street section between intersections, in the zone of intersection impact, and in the zone of intersection itself. The study revealed that the major impact on traffic jams is observed at a distance of 50-100 m from the unsignalized crosswalk. The study analyses pedestrian behavior and waiting time at such crosswalks. It was confirmed that the pedestrians did not immediately use their priority before passing. The paper presents the change in pedestrian waiting time when crossing the roadway depending on traffic flow. Based on that data, a model was prepared and simulations of pedestrian behavior at unsignalized crosswalks were performed.

W pracy przestawiono analizę strat czasu przejazdu pojazdów spowodowane przez przejścia dla pieszych na ulicach jednokierunkowych. Badania obejmowały trzy różne lokalizacje przejść względem skrzyżowania: przejście na odcinku ulicy między skrzyżowaniami, przejście w obrębie strefy oddziaływania skrzyżowania oraz przejście w samej strefie skrzyżowania. Wyniki przeprowadzonych badań wykazały, że znaczący wpływ przejścia bez sygnalizacji na korki obserwuje się w odległości 50-100 m od niego. Przeanalizowano zachowanie oraz czas oczekiwania pieszych na takich przejściach. Potwierdzono, że przechodząc przez jezdnię piesi nie korzystają natychmiast z pierwszeństwa przed samochodami. W pracy przedstawiono zależność czasu oczekiwania pieszych na przejściu od natężenia ruchu pojazdów. Na podstawie uzyskanych danych przygotowano model i przeprowadzono symulacje zachowania pieszych na przejściach bez sygnalizacji.

Optimization of the semi-active vibration absorbers

Snitynskyy Volodymyr, Kernytskyy Ivan, Diveyev Bohdan, Horbay Orest, Fornalchyk Yevhen, Humenuyk Ruslan, Sholudko Yaroslav

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

2021

Vol. 30, No. 2

327--336

In this paper, an efficient numerical approach is proposed to maximize the minimal damping of modes in a prescribed frequency range for general viscous tuned-mass systems. Methods of decomposition and numerical synthesis are considered on the basis of the adaptive schemes. The influence of dynamic vibration absorbers and basic design elastic and damping properties is under discussion. A technique is developed to give the optimal DVA’s for the elimination of excessive vibration in sinusoidal and impact forced system. One task of this work is to analyze parameters identification of the dynamic vibration absorber and the basic structure. The questions of robustness at optimization of DVA are considered. Different types of control management for semi-active DVA’s are applied. Examples of DVA’s practical implementation are presented.

Prospects of electrosleep therapy devices for long-distance drivers

Kernytskyy Ivan, Storchun Yevhen, Yakovenko Yevheniia, Horbay Orest, Humenuyk Ruslan, Sholudko Yaroslav

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

2020

Vol. 29, No. 4

454--460

Accomulated exhaustion is a fairly common problem for long-distance truck and bus drivers on international routes. In case of uncompensated exhaustion, the driver is unable to overcome the resulting attention violations with will effort, which increases the probability of errors and accidents. The last claim is confirmed by the increase in the number of incidents after 7 h and especially 10 h of work. To overcome this problem, it is necessary to stop and fall asleep for a short time. Recovery comes in about 10–15 min of relaxation. The source of stimulation of the brain is weak impulse current, which causes sleep of varying depth and duration. Clinical studies have shown that the strongest impact is on pulses with a duration of approximately 0.3– –0.5 ms and a frequency of repetition ranging from 0.5–2 to 80–100 Hz. Current levels are typically between 50 and 5 mA. Transcranial electrotherapy is considered to stimulate endorphin production and affect the hypothalamus, causing changes in neurohormonal regulatory mechanisms and reticular formation of the brain stem. The reticular formation is involved in many behavioral reactions and has a significant impact on body functioning and thought processes. The aim of this work was to determine correlation between human brain biorhythms and electrosleep device signal by calculating mutual correlation. For this purpose, the model in MATLAB Simulink environment was developed. The encephalogram was processed using the EEGLAB tool to remove artifacts. A model in the MATLAB Simulink environment was developed to evaluate the effect of the signal characteristics of electrosleep therapy devices on brain biorhythms, with the help of which correlation coefficients were calculated.