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Your search keyword '"Rezaee, Mohammad Reza"' showing total 5 results
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5 results on '"Rezaee, Mohammad Reza"'

1. Multi agent reinforcement learning for UAV collision avoidance.

Author

Hamid, Nor Asilah Wati Abdul, Rezaee, Mohammad Reza, and Ismail, Zurita

Subjects
*REINFORCEMENT learning, *DRONE aircraft, *ALGORITHMS
Abstract

The proliferation of unmanned aerial vehicles (UAVs) across many sectors is seeing a fast growth trajectory, resulting in heightened congestion inside the airspace. As a result, the need to guarantee flight safety and mitigate the risk of accidents among unmanned aerial vehicles has emerged as a critical concern within the rapidly advancing realm of drone technology. Multi agent reinforcement learning presents a viable methodology for tackling these challenges, since it empowers drones to exhibit enhanced intelligence when operating in intricate surroundings alongside several agents. This article presents an examination of multi-agent reinforcement learning and its utilization in augmenting the safety of unmanned aerial vehicles. In this paper, we provide a pragmatic instantiation of multi-agent reinforcement learning, which encompasses the participation of several agents. The research results presented in this study provide evidence of the algorithm's efficacy in reducing drone collisions in intricate and highly populated settings, resulting in a significant rate of success. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Comparison of the knee joint reaction force between individuals with and without acute anterior cruciate ligament rupture during walking.

Author

Aghdam, Hossein Akbari, Haghighat, Farzaneh, Rezaee, Mohammad Reza, Kavyani, Mahsa, and Karimi, Mohammad Taghi

Subjects
WALKING speed, KNEE osteoarthritis, FINGER injuries, COMPARATIVE studies, ANTERIOR cruciate ligament injuries, MUSCLE strength, DESCRIPTIVE statistics, DATA analysis software, GROUND reaction forces (Biomechanics), KINEMATICS
Abstract

Background: Anterior cruciate ligament plays a significant role in knee joint stability. It is claimed that the incidence of knee osteoarthritis increases in individuals with anterior cruciate ligament (ACL) rupture. The aim of this study was to evaluate the knee joints reaction force in ACL rupture group compared to normal subjects. Method: Fifteen patients with acute ACL rupture and 15 healthy subjects participated in this study. The ground reaction force (GRF) and kinematic data were collected at a sampling rate of 120 Hz during level-ground walking. Spatiotemporal parameters, joint angles, muscle forces and moments, and joint reaction force (JRF) of lower extremity were analyzed by OpenSIM software. Results: The hip, knee and ankle joints reaction force at loading response and push-off intervals of the stance phase during walking was significantly higher in individuals with ACL rupture compared to healthy controls (p value < 0.05). Walking velocity (p value < 0.001), knee (p value = 0.065) and ankle (p value = 0.001) range of motion in the sagittal plane were significantly lower in the patients with ACL rupture compared to healthy subjects. The mean value of vertical GRF in the mid-stance, the peak of the hip adduction moment in loading response and push-off phases, the hip abductor, knee flexor and vastus intermedius part of quadriceps muscle forces were significantly higher compared to healthy subjects (p < 0.05) while vastus medialis and vastus lateralis produced significantly lower force (p < 0.001). Conclusions: Based on results of this study, lower limb JRF was higher in those with ACL rupture compared to healthy subjects may be due to the compensatory mechanisms used by this group of subjects. An increase in knee JRF in patients with ACL rupture may be the reason for the high incidence of knee OA. [ABSTRACT FROM AUTHOR]

Published
2022
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5. Prevalence of microcytosis in neonates: a cross-sectional study in Tehran.

Author

Khalesi, Nasrin, Khosravi, Nastaran, Rezaee, Mohammad Reza, and Amini, Leila

Subjects
THALASSEMIA diagnosis, HEMOGLOBINS, NEWBORN infants
Abstract

Background: Identification of α thalassemia (α thal) a common cause of microcytosis during neonatal periods is an important step prevent unnecessary interventions. Thus, low the mean corpuscular volume (MCV) and the mean corpuscular hemoglobin (MCH) may consider as α-thalassemia key detection points. The present study aimed to determine the prevalence of microcytosis among neonates who born in Tehran, Iran. Methods: Cord blood samples were collected from 1001 newborns after birth in labor room and their red blood cell parameters were investigated. Results: MCV was 114.2 fl (95% CI: 113.5-114.9) and twenty three neonates (2.3%) had MCV less than 94 fL that classified as microcytosis and 4 (0.40%) had both low MCH and MCV. Conclusion: Low MCV especially in normal Hb newborns may hints for α thal detection. [ABSTRACT FROM AUTHOR]

Published
2014

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