TY - JOUR AU - Balogh, János AU - Dávid, Balázs AU - Krész, Miklós AU - Tóth, Attila AU - Tóth, László TI - A general framework for evaluating driver schedules in public transport JF - TRANSPORT PROBLEMS / PROBLEMY TRANSPORTU: INTERNATIONAL SCIENTIFIC JOURNAL J2 - TRANSP PROBL / PROBLEMY TRANSPORTU / INT SCI J VL - 17 PY - 2022 IS - 1 SP - 163 EP - 174 PG - 12 SN - 1896-0596 DO - 10.20858/tp.2022.17.1.14 UR - https://m2.mtmt.hu/api/publication/32761469 ID - 32761469 LA - English DB - MTMT ER - TY - JOUR AU - Tóth, Attila AU - Knuutila, Timo AU - Nevalainen, Olli S. TI - A divide and combine method for machine configuration and workload balancing problem in multiple product PCB assembly JF - INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY J2 - INT J ADV MANUFACT TECHNOL VL - 120 PY - 2022 IS - 5-6 SP - 4079 EP - 4095 PG - 17 SN - 0268-3768 DO - 10.1007/s00170-022-08819-8 UR - https://m2.mtmt.hu/api/publication/32737705 ID - 32737705 LA - English DB - MTMT ER - TY - JOUR AU - Hajdu, László AU - Tóth, Attila AU - Krész, Miklós TI - Graph Coloring based Heuristic for Crew Rostering JF - ACTA CYBERNETICA J2 - ACTA CYBERN-SZEGED VL - 24 PY - 2020 IS - 4 SP - 643 EP - 661 PG - 19 SN - 0324-721X DO - 10.14232/actacyb.281106 UR - https://m2.mtmt.hu/api/publication/31629656 ID - 31629656 AB - In the last years personnel cost became a huge factor in the financial management of many companies and institutions.The firms are obligated to employ their workers in accordance with the law prescribing labour rules. The companies can save costs with minimizing the differences between the real and the expected worktimes. Crew rostering is assigning the workers to the previously determined shifts, which has been widely studied in the literature. In this paper, a mathematical model of the problem is presented and a two-phase graph coloring method for the crew rostering problem is introduced. Our method has been tested on artificially generated and real life input data. The results of the new algorithm have been compared to the solutions of the integer programming model for moderate-sized problems instances. LA - English DB - MTMT ER - TY - CHAP AU - Tóth, Attila AU - Krész, Miklós ED - Iványi, Péter TI - Lower bound definition for working time in crew scheduling problem T2 - Abstract book for the 15th Miklós Iványi International PhD & DLA Symposium PB - Pollack Press C1 - Pécs SN - 9789634294498 PY - 2019 PG - 1 UR - https://m2.mtmt.hu/api/publication/30926561 ID - 30926561 LA - English DB - MTMT ER - TY - CHAP AU - Tóth, Attila AU - Krész, Miklós ED - Friedler, Ferenc TI - A framework for defining scheduling problems T2 - VOCAL 2018. 8th VOCAL Optimization Conference: Advanced Algorithms PB - Pázmány Péter Catholic University CY - Budapest SN - 9789633083468 PY - 2018 SP - 108 EP - 114 PG - 7 UR - https://m2.mtmt.hu/api/publication/30419831 ID - 30419831 LA - English DB - MTMT ER - TY - JOUR AU - Tóth, Attila AU - Knuutila, Timo AU - Nevalainen, Olli S TI - Machine configuration and workload balancing of modular placement machines in multi-product PCB assembly JF - INTERNATIONAL JOURNAL OF COMPUTER INTEGRATED MANUFACTURING J2 - INT J COMPUT INTEG M VL - 31 PY - 2018 IS - 9 SP - 815 EP - 830 PG - 16 SN - 0951-192X DO - 10.1080/0951192X.2018.1429667 UR - https://m2.mtmt.hu/api/publication/3350991 ID - 3350991 AB - A popular gantry-type placement machine includes several interconnected, autonomously operating component placement modules and the machine was designed so as to able to use different kinds of placement heads and vacuum nozzles in the modules, which can be easily changed. Although this increases the flexibility of the production line, the reconfiguration phases of the modules may be unproductive and one should keep them to a minimum. In addition, the production times can be shortened by balancing the workloads of the machine modules. Here, a two-step optimisation method for the machine reconfiguration and workload balancing in the case of multiple Printed Circuit Borad (PCB) batches of different sizes and PCB types is presented. The objective is to minimise the total production time, and keep the machine configuration the same for all batches. The proposed algorithm is iterative and it applies integer programming for the workload balancing along with an evolutionary algorithm that searches for the best machine configuration. In experiments, for single PCB types the proposed algorithm obtained optimal or near optimal solutions. For multiple PCB types the solutions favour the PCB types that have a bigger production time due to greater batch sizes, but the total production time is still close to optimal. LA - English DB - MTMT ER - TY - BOOK AU - Annus, Gábor AU - Balogh, János AU - Békési, József AU - Dávid, Balázs AU - Krnács, András AU - Tóth, Attila TI - Modern informatikai eszközök használata a sportinformatikában ET - 0 PB - Szegedi Tudományegyetem Juhász Gyula Pedagógusképző Kar CY - Szeged PY - 2015 SN - 9789633064429 UR - https://m2.mtmt.hu/api/publication/3276466 ID - 3276466 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Hajdu, László AU - Krész, Miklós AU - Tóth, Attila ED - Iztok, Fister jr ED - Andrej, Brodnik TI - Graph coloring based heuristic for driver rostering T2 - Proceedings of the 2014 1st Student Computer Science Research Conference PB - University of Primorska Press CY - Koper SN - 9789616963039 PY - 2014 SP - 9 EP - 12 PG - 4 UR - https://m2.mtmt.hu/api/publication/2885245 ID - 2885245 LA - English DB - MTMT ER - TY - CHAP AU - Árgilán, Viktor Sándor AU - Balogh, János AU - Tóth, Attila ED - Emőd, Kovács ED - Gábor, Kusper ED - Kunkli, Roland Imre ED - Tibor, Tómács TI - The basic problem of vehicle scheduling can be solved by maximum bipartite matching. Vol. 2. TS - Vol. 2. T2 - ICAI 2014: Proceedings of the 9th International Conference on Applied Informatics, vol. 1-2 PB - Eszterházy Károly Tanárképző Főiskola (EKTF) CY - Eger SN - 9786155297182 PY - 2014 SP - 209 EP - 218 PG - 10 DO - 10.14794/ICAI.9.2014.2.209 UR - https://m2.mtmt.hu/api/publication/2880537 ID - 2880537 N1 - In: In: Emőd Kovács, Gábor Kusper, Roland Kunkli, Tibor Tómács (szerk.), Proceedings of the 9th International Conference on Applied Informatics, vol. 1-2: ICAI 2014. Konferencia helye, ideje: Eger, Magyarország, 2014.01.29-2014.02.01. Eger: Eszterházy Károly Főiskola, 2014. Proceedings of the 9th International Conference on Applied Informatics, vol. 1-2: ICAI 2014. Konferencia helye, ideje: Eger, Magyarország, 2014.01.29-2014.02.01. Eger: Eszterházy Károly Főiskola, 2014. LA - English DB - MTMT ER - TY - JOUR AU - Árgilán, Viktor Sándor AU - Balogh, János AU - Békési, József AU - Dávid, Balázs AU - Galambos, Gábor AU - Krész, Miklós AU - Tóth, Attila TI - Ütemezési feladatok az autóbuszos közösségi közlekedés operatív tervezésében: Egy áttekintés JF - ALKALMAZOTT MATEMATIKAI LAPOK J2 - ALK MAT LAP VL - 31 PY - 2014 SP - 1 EP - 40 PG - 40 SN - 0133-3399 UR - https://m2.mtmt.hu/api/publication/2532007 ID - 2532007 LA - Hungarian DB - MTMT ER -