TY - JOUR AU - Mráz, János Albert AU - Kis, Zsolt AU - Imre, Sándor AU - Gyöngyösi, László AU - Bacsárdi, László TI - Quantum circuit-based modeling of continuous-variable quantum key distribution system JF - INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS J2 - INT J CIRC THEOR APP VL - 45 PY - 2017 IS - 7 SP - 1017 EP - 1028 PG - 12 SN - 0098-9886 DO - 10.1002/cta.2347 UR - https://m2.mtmt.hu/api/publication/3218897 ID - 3218897 N1 - Department of Networked Systems and Services, Budapest University of Technology and Economics, Budapest, Hungary Wigner Research Center for Physics Hungarian Academy of Sciences, Budapest, Hungary Cited By :6 Export Date: 4 April 2024 CODEN: ICTAC Correspondence Address: Mráz, A.; Department of Networked Systems and Services, Hungary; email: mraz@hit.bme.hu Funding details: Hungarian Scientific Research Fund, K-112125 Funding text 1: The work reported in this paper has been supported by the Hungarian Scientific Research Fund-OTKA K-112125. LA - English DB - MTMT ER - TY - BOOK ED - Bacsárdi, László ED - Szűcs, Eszter ED - Wesztergom, Viktor TI - Magyar Űrkutatási Fórum 2017. Az előadások összefoglalói TS - Az előadások összefoglalói ET - 0 PB - Magyar Asztronautikai Társaság CY - Budapest PY - 2017 SP - 60 SN - 9789637367144 UR - https://m2.mtmt.hu/api/publication/3211511 ID - 3211511 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Bacsárdi, László AU - Roger, Birkeland AU - Andreas, Hornig AU - Shar, Mansoor AU - Brandon, Morrison AU - Yevgeny, Tsodikovich ED - IAF, , TI - The current state and the future of Space Internet - the Space Generation Perspective T2 - 67th International Astronautical Congress, IAC 2016 PB - International Astronautical Federation (IAF) CY - Red Hook (NY) CY - Párizs SN - 9781510835825 T3 - Proceedings of the International Astronautical Congress, IAC, ISSN 0074-1795 PY - 2016 SP - 10486 EP - 10494 PG - 9 UR - https://m2.mtmt.hu/api/publication/3161743 ID - 3161743 N1 - Scopus:hiba:85016484593 2022-10-13 12:39 befoglaló év nem egyezik, befoglaló egyiknél nincsenek szerzők, befoglaló cím nem egyezik AB - In the last decade, the internet has become an integral part of daily life in the developed world. Current estimates suggest that as many as four billion people worldwide are left without access to the internet, and without the ability to enjoy its benefits. During the Space Generation Congress 2015, held in Jerusalem, Israel, students and young professionals representing 14 countries participated in the Space Communication - Space Internet working group. The group investigated the possibilities, risks, and opportunities of using satellites, drones, and high altitude balloons to provide widespread access to the internet. The group focused on one of the barriers for worldwide connectivity - the lack of economic viability of providing internet access using land infrastructure, and the possible solutions that will address this problem. As a result of these findings, the working group participants proposed several recommendations. These recommendations take into account the numerous challenges that come with developing air-based internet access whether it be via balloons, drones, or satellites. Such recommendations also include the possibilities that such technologies will be utilized conjunction. These challenges range from regulatory to technical and practical limitations, such as the potential for damage to property, and issues related to orbital debris. Due to our group's consensus that worldwide internet availability would ultimately be beneficial, given both humanitarian and economic concerns for poor and wealthy nations alike, we propose four "game changing" ideas that have the potential to positively impact the space economy. We first suggest that market studies be conducted to illustrate demand for the service. With sufficient demand, a phased approach to the solution should then be instituted. We further propose that national governments serve as anchor tenants and expedite regulatory processes. Finally, to ensure commercial sustainability, Internet Service Providers (ISP's) should be provided connectivity to the system. Our paper deals with the current status and the future of the space-based internet services and details our recommendations. Copyright © 2016 by the International Astronautical Federation (IAF). All rights reserved. LA - English DB - MTMT ER - TY - CHAP AU - Istvan, Vercseg AU - Bacsárdi, László ED - IAF, , TI - Simulation of information transfer on quantum-based satellite network T2 - 67th International Astronautical Congress, IAC 2016 PB - International Astronautical Federation (IAF) CY - Red Hook (NY) CY - Párizs SN - 9781510835825 T3 - Proceedings of the International Astronautical Congress, IAC, ISSN 0074-1795 PY - 2016 SP - 3274 EP - 3278 PG - 5 UR - https://m2.mtmt.hu/api/publication/3161742 ID - 3161742 N1 - Scopus:hiba:85016447685 2022-10-13 12:39 befoglaló év nem egyezik, befoglaló egyiknél nincsenek szerzők, befoglaló cím nem egyezik AB - In our modern world, providing secure communications is harder and harder task, especially when the almost mystical quantum computer teasing us with its slowly approaching presence. While the universal quantum computer is far from completion, there are some working solutions using quantum mechanics. One of those technologies, the quantum-based key distribution (QKD) can protect our communications from any unauthorized third party. The QKD offers the possibility of a key exchange process which cannot be attacked or eavesdropped without the notification of the communication parties, since any attempt of eavesdropping the key will disturb the quantum states revealing the presence of an eavesdropper. The result of the exchange process is a classical string of bits, which can be further applied in nowadays used symmetrical coding protocols. The QKD became a state-of-art technology of our communications world since not only research institutions provide the efficiency of this technology but different companies were established to sell QKD services to their customers. But the usage of fiber-based QKD is limited in wired networks due to the physical properties of the optical fiber. This is why our work is focusing on the analysis of QKD technology in free-space environment, especially via satellites. One of the most interesting question is the following: How efficient could be this technology and what are its bounds in a satellite-satellite network? QuantumSat, our developed simulation framework is capable for simulating secure information transfer via satellites. To ensure security, we applied symmetric cryptography protocols (AES/Rijndael block cipher) for which the symmetric keys were provided by quantum-based key distribution protocols (namely BB84, B92). To help the analyzing of quantum-based satellite network, QuantumSat has two modes. The first mode is simulating one-hop or multi-hop secure communication between satellites, and the second one is to simulate communication between ground stations using satellites. While the former mode distributes individual quantum keys between each satellite that takes part in the communication, the latter mode distributes one key between the ground stations, and only update it when necessary. The simulation is visualized by a scale model animated on Java3D. With this, the user can accurately track the movements of the satellites either on real time or accelerated speed up to 1000x. These functions are designed to get more data more easily, and to test long-term communications. Using our simulation framework, we analyzed the feasibility of such network on different orbits. Copyright © 2016 by the International Astronautical Federation (IAF). All rights reserved. LA - English DB - MTMT ER - TY - CHAP AU - Gludovátz, Attila AU - Bacsárdi, László ED - Szakál, Anikó TI - Production Related IT Solutions in the Operation of Factories T2 - 2016 17TH IEEE INTERNATIONAL SYMPOSIUM ON COMPUTATIONAL INTELLIGENCE AND INFORMATICS (CINTI 2016 PB - IEEE Hungary Section CY - Budapest SN - 1509039104 T3 - International Symposium on Computational Intelligence and Informatics, CINTI, ISSN 2380-8586 PY - 2016 SP - 187 EP - 192 PG - 6 UR - https://m2.mtmt.hu/api/publication/3161475 ID - 3161475 LA - English DB - MTMT ER - TY - CONF AU - Gludovátz, Attila AU - Bacsárdi, László ED - Honfi, Vid Sebestyén TI - The 4th industrial revolution's challenges at the wood industrial manufactories T2 - A generációváltás informatikai vonatkozásai PB - DUE Press C1 - Dunaújváros PY - 2016 SP - 15 EP - 17 PG - 2 UR - https://m2.mtmt.hu/api/publication/3161453 ID - 3161453 LA - English DB - MTMT ER - TY - CONF AU - Kiss, Péter AU - Bencsik, Gergely AU - Bacsárdi, László ED - Honfi, Vid Sebestyén TI - New simulation approach of the supply chain management T2 - A generációváltás informatikai vonatkozásai PB - DUE Press C1 - Dunaújváros PY - 2016 SP - 35 EP - 37 PG - 3 UR - https://m2.mtmt.hu/api/publication/3161285 ID - 3161285 LA - English DB - MTMT ER - TY - JOUR AU - Szalai, László AU - Pödör, Zoltán TI - Lucfenyő fűrészáru szilárdsági vizsgálata lézer alapú roncsolásmentes optikai eljárással = Laser based optical nondestructive method for evaluating spruce timber strength JF - FAIPAR J2 - FAIPAR VL - 64 PY - 2016 IS - 2 SP - 15 EP - 21 PG - 7 SN - 0014-6897 DO - 10.14602/WOODSCI.2016.2.57 UR - https://m2.mtmt.hu/api/publication/3152880 ID - 3152880 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Kalmár, János TI - Automatikus kiértékelő program ionogramok értelmezéséhez JF - DIMENZIÓK: MATEMATIKAI KÖZLEMÉNYEK J2 - DIMENZIÓK VL - 4 PY - 2016 SP - 23 EP - 28 PG - 6 SN - 2064-2172 DO - 10.20312/dim.2016.03 UR - https://m2.mtmt.hu/api/publication/3149180 ID - 3149180 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Führer, Ernő AU - Edelényi, Márton AU - Jagodics, Anikó AU - Jereb, László Tibor AU - Horváth, László AU - Kern, Zoltán AU - Móring, Andrea AU - Szabados, I AU - Pödör, Zoltán TI - Az időjárás hatása egy időskorú bükkös évenkénti körlap-növekedésére = Effect of weather conditions on the annual basal area increment of a beech stand of old age JF - ERDÉSZETTUDOMÁNYI KÖZLEMÉNYEK J2 - ERDÉSZETTUD KÖZL VL - 6 PY - 2016 IS - 1 SP - 61 EP - 78 PG - 18 SN - 2062-6711 DO - 10.17164/EK.2016.006 UR - https://m2.mtmt.hu/api/publication/3143729 ID - 3143729 LA - Hungarian DB - MTMT ER -