Communications - Scientific Letters of the University of Zilina - Online first
Functional Safety-Oriented Risk Analysis of Heavy Vehicle Platooning
Luboš Mikula, Jan Famfulík
Communications - Scientific letters of the University of Zilina X:X | DOI: 10.26552/com.C.2026.015 
In this paper is presented platooning as a promising approach to reduce the greenhouse gas emissions, fuel consumption, and operation costs in heavy traffic. Attention is given to a risk assessment of vehicle-to-vehicle (V2V) communication in the context of ISO 26262, Edition 2: Road vehicles - Functional safety. [ISO 26262-2 2018] The analysis focuses on safety-related hazards associated with convoy driving of heavy vehicles, utilizing the principles of functional safety. It applies hazard analysis and risk assessment (HARA) to classify potential risks according to their severity, exposure, and controllability. Automotive safety integrity level (ASIL)...
Optimizing Combustion Process: The Impact of Flame Zone Air Supply on Emissions and Performance in Pellet Boiler
Alexander Backa, Nikola Čajová Kantová, Peter Hrabovský, Pavol Belány, Róbert Cibula, Sławomir Sładek
Communications - Scientific letters of the University of Zilina X:X | DOI: 10.26552/com.C.2026.016
Biomass combustion is a widely used renewable option for a small-scale heat and power, but incomplete burnout and pollutant formation remain challenges in boilers without optimized air staging. In this study, is investigated how controlled transport of air into the flame zone, implemented with an auxiliary tertiary system, affects performance and emissions in a bottom-fed pellet boiler. Tests were performed at constant fuel feed and primary/secondary airflow, with tertiary air varied between 0 and 15.8 m3/h. An airflow of about 8.9 m3/h proved optimal, giving the highest thermal output, a more uniform temperature distribution, and a nearly twentyfold...
Enhanced Harris Hawk Multi-Objective Optimization Algorithm for Cognitive Radio-Vehicular Ad Hoc Networks
Md. Asif Hossain
Communications - Scientific letters of the University of Zilina X:X | DOI: 10.26552/com.C.2026.017
In this paper is presented an Enhanced Harris Hawk Multi-Objective Optimization (EH-HHO) algorithm for joint spectrum allocation, interference mitigation, and energy efficiency optimization in Cognitive Radio–Vehicular Ad Hoc Networks (CR-VANETs). EH-HHO integrates adaptive exploration, dynamic switching, and crowding-distance preservation to avoid premature convergence and obtain well-distributed Pareto-optimal solutions. Extensive simulations, using the SUMO–OMNeT++, VEINS/ns-3, and hardware-in-the-loop experiments, show superior spectrum utilization, energy savings, and convergence speed compared to NSGA-II and MOPSO. Statistical validation...