TY - JOUR AU - Martín, F. AU - Janssen, S. AU - Rodrigues, V. AU - Sousa, J. AU - Santiago, J.L. AU - Rivas, E. AU - Stocker, J. AU - Jackson, R. AU - Russo, F. AU - Villani, M.G. AU - Tinarelli, G. AU - Barbero, D. AU - José, R. San AU - Pérez-Camanyo, J.L. AU - Santos, G. Sousa AU - Bartzis, J. AU - Sakellaris, I. AU - Horváth, Zoltán AU - Környei, László AU - Liszkai, B. AU - Kovács, Á. AU - Jurado, X. AU - Reiminger, N. AU - Thunis, P. AU - Cuvelier, C. TI - Using dispersion models at microscale to assess long-term air pollution in urban hot spots: A FAIRMODE joint intercomparison exercise for a case study in Antwerp JF - SCIENCE OF THE TOTAL ENVIRONMENT J2 - SCI TOTAL ENVIRON VL - 925 PY - 2024 SN - 0048-9697 DO - 10.1016/j.scitotenv.2024.171761 UR - https://m2.mtmt.hu/api/publication/34749014 ID - 34749014 LA - English DB - MTMT ER - TY - JOUR AU - Hajba, Tamás AU - Horváth, Zoltán AU - Heitz, Dániel AU - Psenák, Bálint TI - A MILP approach combined with clustering to solve a special petrol station replenishment problem JF - CENTRAL EUROPEAN JOURNAL OF OPERATIONS RESEARCH J2 - CEJOR VL - 32 PY - 2024 SP - 95 EP - 107 PG - 13 SN - 1435-246X DO - 10.1007/s10100-023-00849-1 UR - https://m2.mtmt.hu/api/publication/33757334 ID - 33757334 AB - Vehicle routing problem is a well-known optimization problem in the logistics area. A special case of the vehicle routing problem is the station replenishment problem in which different types of fuel types have to be transported from the depots to the customers. In this paper we study the replenishment problem of a European petrol company. The problem contains several additional constraints such as time windows, different sized compartment vehicles, and restrictions on the vehicles that can serve a customer. We introduce a mixed integer linear programming model of the problem. To reduce the size complexity of the MILP model the customers are clustered and, based on the clusters, additional constraints are added to the MILP model. The resulting MILP model is tested on real problems of the company. The results show that combining the MILP model with clustering improves the effectiveness of the model. LA - English DB - MTMT ER - TY - CONF AU - Tomaschek, Tamás Attila AU - Horváth, Zoltán AU - Környei, László AU - Kovács, Ákos AU - Constans, Mátyás TI - Developing a High Performance Computing Framework for Simulating and Reducing Urban Air Pollution. The HiDALGO Solution TS - The HiDALGO Solution T2 - XXVIIth World Road Congress Proceedings of the Congress PY - 2023 SP - IP0572 PG - 11 UR - https://m2.mtmt.hu/api/publication/34553354 ID - 34553354 AB - Almost the entire global population (99%) breathes unhealthy levels of fine particulate matter and nitrogen dioxide. Bad air quality in many cities results in 4.2 million premature deaths worldwide per year according to WHO reports and more than 344,000 additional premature deaths (PM2.5, NO2, O3 pollutants) across EU-27 member states. One of the most severe pollutant is NO2 of which main producer is the vehicular traffic. EC introduced assessment methods of exposure measurements and set up policies for ensuring citizens with clean air. Since the implementation of the Directive 2008/50/EC, modelling can be used for some assessments. However, air pollution forecasts are provided only to a limited number of cities and with aggregated values only, contrary that very high spatial resolution would be necessary for accurate epidemiology exposure computations. This is requested by the fact that there may be substantial differences between the concentrations of air pollutants over the city: hot spots may arise and stay at certain places regularly resulting high exposure while the overall (average) air quality indicators used in policies, are below policy thresholds. The urban air pollution pilot implemented in the framework of HiDALGO project provides policy makers and the society with a computational tool as service that accurately and quickly forecasts air pollution in cities with very high resolution (1-2 meter resolution at street level). Such a tool did not exist before. A complex traffic and air quality monitoring and traffic control system has been developed in the city of Győr (Western Hungary) to both minimize air pollution while considering traffic flow constraints and serve as validation use case of the computational tools. These main goals were achieved by developing a HPC-framework for simulating the air flow in cities by taking into account real 3D geographical information data of the city, applying highly accurate computational fluid dynamics (CFD) simulation on a highly resolved mesh and using weather forecast data as boundary conditions. Dispersion of the vehicular traffic emitted pollutants in the wind field is computed with strong coupling to the airflow computation. Here the emission is computed from the weakly coupled traffic simulations. The elaborated solution is a valuable tool for the European public and experts for high resolution modelling purposes. LA - English DB - MTMT ER - TY - JOUR AU - Khamlich, Moaad AU - Stabile, Giovanni AU - Rozza, Gianluigi AU - Környei, László AU - Horváth, Zoltán TI - A physics-based reduced order model for urban air pollution prediction JF - COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING J2 - COMPUT METHOD APPL M VL - 417 PY - 2023 SN - 0045-7825 DO - 10.1016/j.cma.2023.116416 UR - https://m2.mtmt.hu/api/publication/34162074 ID - 34162074 LA - English DB - MTMT ER - TY - JOUR AU - Bakosi, József AU - Constans, Mátyás AU - Horváth, Zoltán AU - Kovács, Ákos AU - Környei, László AU - Charest, Marc AU - Pandare, Aditya AU - Rutherford, Paula AU - Waltz, Jacob TI - Complex-Geometry 3D Computational Fluid Dynamics with Automatic Load Balancing JF - FLUIDS J2 - FLUIDS VL - 8 PY - 2023 IS - 5 SN - 2311-5521 DO - 10.3390/fluids8050147 UR - https://m2.mtmt.hu/api/publication/34059469 ID - 34059469 AB - We present an open-source code, Xyst, intended for the simulation of complex-geometry 3D compressible flows. The software implementation facilitates the effective use of the largest distributed-memory machines, combining data-, and task-parallelism on top of the Charm++ runtime system. Charm++’s execution model is asynchronous by default, allowing arbitrary overlap of computation and communication. Built-in automatic load balancing enables redistribution of arbitrarily heterogeneous computational load based on real-time CPU load measurement at negligible cost. The runtime system also features automatic checkpointing, fault tolerance, resilience against hardware failure, and supports power- and energy-aware computation. We verify and validate the numerical method and demonstrate the benefits of automatic load balancing for irregular workloads. LA - English DB - MTMT ER - TY - JOUR AU - Istenes, György AU - Pusztai, Zoltán AU - Kőrös, Péter AU - Horváth, Zoltán AU - Friedler, Ferenc TI - Kriging-Assisted Multi-Objective Optimization Framework for Electric Motors Using Predetermined Driving Strategy JF - ENERGIES J2 - ENERGIES VL - 16 PY - 2023 IS - 12 SN - 1996-1073 DO - 10.3390/en16124713 UR - https://m2.mtmt.hu/api/publication/34018990 ID - 34018990 N1 - Vehicle Industry Research Center, Széchenyi István University, Egyetem Tér 1, Győr, 9026, Hungary Department of Mathematics and Computational Sciences, Széchenyi István University, Egyetem Tér 1, Győr, 9026, Hungary Cited By :1 Export Date: 16 October 2023 Correspondence Address: Friedler, F.; Vehicle Industry Research Center, Egyetem Tér 1, Hungary; email: f.friedler@ga.sze.hu Funding details: European Commission, EC Funding text 1: The research was supported by the European Union within the framework of the National Laboratory for Artificial Intelligence (RRF-2.3.1-21-2022-00004). AB - In this paper, a multi-objective optimization framework for electric motors and its validation is presented. This framework is suitable for the optimization of design variables of electric motors based on a predetermined driving strategy using MATLAB R2019b and Ansys Maxwell 2019 R3 software. The framework is capable of managing a wide range of objective functions due to its modular structure. The optimization can also be easily parallelized and enhanced with surrogate models to reduce the runtime. The framework is validated by manufacturing and measuring the optimized electric motor. The method’s applicability for solving electric motor design problems is demonstrated via the validation process. A test application is also presented, in which the operating points of a predetermined driving strategy provide the input for the optimization. The kriging surrogate model is used in the framework to reduce the runtime. The results of the optimization and the framework’s benefits and drawbacks are discussed through the provided examples, in addition to displaying the properly applicable design processes. The optimization framework provides a ready-to-use tool for optimizing electric motors based on the driving strategy for single- or multi-objective purposes. The applicability of the framework is demonstrated by optimizing the electric motor of a world recorder energy-efficient race vehicle. In this application, the optimization framework achieved a 2% improvement in energy consumption and a 9% increase in speed at a rated DC voltage, allowing the motor to operate at desired working points even with low battery voltage. LA - English DB - MTMT ER - TY - CHAP AU - Istenes, György AU - Horváth, Zoltán ED - Szauter, Ferenc ED - Csikor, Dániel ED - Földesi, Rita ED - Suta, Alex ED - Szabó, Amanda TI - A kriging asszisztens algoritmus hatékonyságának vizsgálata különböző tesztfeladatokon T2 - Mobilitás és környezet JÖVŐFORMÁLÓ JÁRMŰIPARI KUTATÁSOK Konferenciakiadvány 2022. novemberi konferencia PB - Széchenyi István Egyetem CY - Győr SN - 9786156443182 PY - 2022 SP - 68 EP - 78 PG - 11 UR - https://m2.mtmt.hu/api/publication/34132489 ID - 34132489 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Istenes, György AU - Horváth, Zoltán ED - Szauter, Ferenc ED - Csikor, Dániel ED - Földesi, Rita ED - Suta, Alex TI - Villamos motor optimalizációhoz alkalmazott végeselemes modell validációja T2 - „Digitális Járműipari Kutatások a Széchenyi István Egyetemen – Mesterséges Intelligencia a mobilitásban” Konferenciakiadvány 2022. június PB - Széchenyi István Egyetem CY - Győr SN - 9786156443151 PY - 2022 SP - 171 EP - 179 PG - 9 UR - https://m2.mtmt.hu/api/publication/34032760 ID - 34032760 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Rácz, István AU - Horváth, András AU - Horváth, Zoltán TI - Response to Artificial intelligence-based colorectal polyp histology prediction using narrow-band image-magnifying colonoscopy: a stepping stone for clinical practice JF - CLINICAL ENDOSCOPY J2 - CLIN ENDOSC VL - 55 PY - 2022 IS - 5 SP - 701 EP - 702 PG - 2 SN - 2234-2400 DO - 10.5946/ce.2022.123.1 UR - https://m2.mtmt.hu/api/publication/33211936 ID - 33211936 LA - English DB - MTMT ER - TY - CHAP AU - Istenes, György AU - Horváth, Zoltán ED - IEEE, null TI - Multi-objective Optimization of Electric Motors with a Kriging Surrogate Model T2 - 2022 22nd International Symposium on Electrical Apparatus and Technologies (SIELA) PB - Institute of Electrical and Electronics Engineers (IEEE) CY - Bourgas SN - 9781665411394 ; 9781665411387 ; 9781728186702 PY - 2022 SP - 1 EP - 4 PG - 4 DO - 10.1109/SIELA54794.2022.9845694 UR - https://m2.mtmt.hu/api/publication/33099057 ID - 33099057 LA - English DB - MTMT ER -