TY - JOUR AU - Chvátal, V. AU - de, Rancourt N. AU - Gamboa, Quintero G. AU - Kantor, I. AU - Szabó, Péter G.N. TI - Metric spaces in which many triangles are degenerate JF - DISCRETE APPLIED MATHEMATICS J2 - DISCRETE APPL MATH VL - 350 PY - 2024 SP - 97 EP - 99 PG - 3 SN - 0166-218X DO - 10.1016/j.dam.2024.02.021 UR - https://m2.mtmt.hu/api/publication/34751431 ID - 34751431 AB - Richmond and Richmond (1997) proved the following theorem: If, in a metric space with at least five points, all triangles are degenerate, then the space is isometric to a subset of the real line. We prove that the hypothesis is unnecessarily strong: In a metric space on n points, fewer than 7n2/6 suitably placed degenerate triangles suffice. However, fewer than n(n−1)/2 degenerate triangles, no matter how cleverly placed, never suffice. © 2024 LA - English DB - MTMT ER - TY - JOUR AU - Rajs, Vladimir AU - Herceg, Dejana AU - Despotović, Živadin AU - Bogdanović, Miroslav AU - Šiljegović, Mirjana AU - Popadić, Bane AU - Kiraly, Zoltan AU - Vizvári, Zoltán Ákos AU - Sári, Zoltán AU - Klincsik, Mihály AU - Felde, Imre AU - Odry, Péter AU - Tadity, Vladimir TI - Dead-Time Effect in Inverters on Wireless Power Transfer JF - ELECTRONICS (SWITZ) VL - 13 PY - 2024 IS - 2 PG - 14 SN - 2079-9292 DO - 10.3390/electronics13020304 UR - https://m2.mtmt.hu/api/publication/34496311 ID - 34496311 N1 - Faculty of Technical Sciences, Department of Power, Electronic and Telecommunication Engineering, University of Novi Sad, Trg Dositeja Obradovića 6, Novi Sad, 21000, Serbia Faculty of Sciences, Department of Physics, University of Novi Sad, Trg Dositeja Obradovića 6, Novi Sad, 21000, Serbia Institute of Information Technology, University of Dunaujvaros, Tancsics M. Str. 1/A, Dunaujvaros, H-2401, Hungary John von Neumann Faculty of Informatics, University of Obuda, Becsi Str. 96/B, Budapest, H-1034, Hungary Symbolic Methods in Material Analysis and Tomography Research Group, Faculty of Engineering and Information Technology, University of Pecs, Boszorkany Str. 6, Pecs, H-7624, Hungary Faculty of Engineering and Information Technology, University of Pecs, Boszorkany Str. 2, Pecs, H-7624, Hungary Cellular Bioimpedance Research Group, Szentagothai Research Centre, University of Pecs, Ifjusag Str. 20, Pecs, H-7624, Hungary Export Date: 9 February 2024 Correspondence Address: Tadic, V.; Institute of Information Technology, Tancsics M. Str. 1/A, Hungary; email: tadity.laszlo@uni-obuda.hu Funding details: GINOP_PLUSZ-2.1.1-21-2022-00249 Funding text 1: This research was funded by projects 2020-1.1.2-PIACI-KFI-2020-00166 and 2020-1.1.2-PIACI-KFI-2020-00173 of the University of Dunaujavaros and by project GINOP_PLUSZ-2.1.1-21-2022-00249 of the University of Obuda, co-financed by the Hungarian State. AB - This paper presents a comprehensive analysis of the dead-time effects in wireless power transfer systems based on LCC-S topology. In these systems operating at high frequencies, the ratio of dead-time versus the operating period becomes critical, and the dead-time issue can cause certain problems regarding power quality, efficiency, and output voltage ripple. The impact of input quantities such as voltage and switching frequency on the efficiency and output power of the LCC-S-tuned WPT system was also investigated. The optimal combination of these parameters used to achieve the maximum efficiency for a target output power and to set the appropriate value of the dead time were determined by running multiple simulations using the MATLAB R2023b software platform. It was also shown that the output voltage remained unchanged with and without a load and up to 1200 ns of dead-time, which provides a simple implementation of the corresponding mathematical model. In the recommended interval of 600–1500 ns, the influence of the dead-time on the value of the output voltage amplitude is less than 10%. The validity of the proposed method was confirmed through the implementation of the experimental prototype, a 5 kW wireless power transmission system, and the obtained results were in accordance with the simulation results. LA - English DB - MTMT ER - TY - JOUR AU - Szegő, Dóra TI - How Blended Learning Techniques can be Applied in Teaching Mathematics to Engineering Students JF - INTERNATIONAL JOURNAL FOR TECHNOLOGY IN MATHEMATICS EDUCATION J2 - INT J TECH MATH EDUC VL - 30 PY - 2023 IS - 2 SP - 95 EP - 103 PG - 9 SN - 1744-2710 DO - 10.1564/tme_v30.2.3 UR - https://m2.mtmt.hu/api/publication/34108583 ID - 34108583 AB - Begun in the mid-90s, computers have long been a staple in teaching mathematics to engineering students. In recent years, with the effects of the Covid-19 pandemic and the arrival of Generation Z in tertiary education, the role of blended learning has increased. This paper highlights some of the greater challenges and successes of the transition from traditional teaching techniques to the creation of blended learning environments through three case studies. First, the translation of pen-and-paper education to a computerissed form in everyday online and face-to-face practice classes. Second, the reimagination of correspondence courses as blended learning courses. Finally, setting the final exams in a computerised environment: what types of questions are appropriate to measure students' effective understanding of engineering mathematics. LA - English DB - MTMT ER - TY - CHAP AU - Perjésiné Hámori, Ildikó ED - Heiß, Hans-Ulrich ED - Järvinen, Hannu-Matti ED - Mayer, Annette ED - Schulz, Alexandra TI - Principle of Spirality and Gradation in the Usage of Technology in the Courses of Engineering Mathematics T2 - SEFI 2021 49th Annual Conference Proceedings: Blended Learning in Engineering Education: challenging, enlightening – and lasting? PB - Technische Universität Berlin CY - Berlin SN - 9782873520236 PY - 2021 SP - 1113 EP - 1121 PG - 9 UR - https://m2.mtmt.hu/api/publication/32587138 ID - 32587138 N1 - Export Date: 15 May 2023; Cited By: 0; Correspondence Address: I. Perjési-Hámori; University of Pécs, Faculty of Engineering and Information Technology, Pécs, Hungary; email: perjesi@mik.pte.hu LA - English DB - MTMT ER - TY - CHAP AU - Zvara, Zoltán AU - Szabó, Péter G.N. AU - Balázs, Barnabás Lóránt AU - Benczúr, András, ifj TI - System-aware dynamic partitioning for batch and streaming workloads T2 - Proceedings of the 14th IEEE/ACM International Conference on Utility and Cloud Computing (UCC 2021) PB - Association for Computing Machinery (ACM) CY - New York, New York SN - 9781450385640 PY - 2021 PG - 10 DO - 10.1145/3468737.3494087 UR - https://m2.mtmt.hu/api/publication/32561420 ID - 32561420 LA - English DB - MTMT ER - TY - JOUR AU - Sárvári, Csaba TI - Guest Editorial JF - INTERNATIONAL JOURNAL FOR TECHNOLOGY IN MATHEMATICS EDUCATION J2 - INT J TECH MATH EDUC VL - 28 PY - 2021 IS - 3 SP - 115 EP - 116 PG - 2 SN - 1744-2710 UR - https://m2.mtmt.hu/api/publication/32557335 ID - 32557335 LA - English DB - MTMT ER - TY - BOOK AU - Szegő, Dóra TI - Gráfelméleti alapok. Gráfok osztályozása, tulajdonságai, részgráfok TS - Gráfok osztályozása, tulajdonságai, részgráfok PB - Pécsi Tudományegyetem CY - Pécs PY - 2021 SP - 4 SN - 9789634298885 UR - https://m2.mtmt.hu/api/publication/32543871 ID - 32543871 LA - Hungarian DB - MTMT ER - TY - BOOK AU - Szegő, Dóra TI - Kombinatorika. Alapfogalmak TS - Alapfogalmak PB - Pécsi Tudományegyetem CY - Pécs PY - 2021 SP - 5 SN - 9789634298878 UR - https://m2.mtmt.hu/api/publication/32543864 ID - 32543864 LA - Hungarian DB - MTMT ER - TY - BOOK AU - Szegő, Dóra TI - Halmazok. Halmazok elemszáma, relációi, műveletei TS - Halmazok elemszáma, relációi, műveletei PB - Pécsi Tudományegyetem CY - Pécs PY - 2021 SP - 7 SN - 9789634298861 UR - https://m2.mtmt.hu/api/publication/32543852 ID - 32543852 LA - Hungarian DB - MTMT ER - TY - BOOK AU - Szegő, Dóra TI - A matematika alapvető fogalmai, szimbólumok, logikai műveletek PB - Pécsi Tudományegyetem CY - Pécs PY - 2021 SP - 13 SN - 9789634298854 UR - https://m2.mtmt.hu/api/publication/32543845 ID - 32543845 LA - Hungarian DB - MTMT ER -