http://hdl.handle.net/20.500.14044/36533 Wed, 07 Oct 2026 10:12:37 GMT 2026-10-07T10:12:37Z http://hdl.handle.net/20.500.14044/40460 Additional wireless communication technologies that are used in LoRaWAN products and their importance in the field of personal and property protection Borsos, Döníz Dr. Temesvári, Zsolt The LoRaWAN wireless communication technology has several advantages: a wide range, significant interference immunity, and low power consumption. There are many possible uses for the technology. In addition to LoRaWAN communication, other communications are used in LoRaWAN products. These communications can play a complementary role, but they can also have the same or a higher priority. Roles and priorities depend on the specific technology or application area. In addition to the LoRaWAN communication, WiFi, Bluetooth Low Energy, or some LPWAN (Low-Power Wide-Area Network) technology is usually used. The paper deals with the description of wireless communications used in LoRaWAN products. IoT, and thus LoRaWAN solutions, are now for our convenience and have become necessary. As a result, the solutions are also part of the protection of people and property. The goal is to see how they relate to the devices’ use. Among the investigative aspects, the personal and property protection aspect of the topic is of paramount importance. The review covers BLE and WiFi communications and focuses primarily on tracking applications. Wed, 01 Jan 2020 00:00:00 GMT http://hdl.handle.net/20.500.14044/40460 2020-01-01T00:00:00Z http://hdl.handle.net/20.500.14044/40459 Biometric identification and LoRaWAN communication problems in remote health monitoring Szántó, Marcell Dr. Temesvári, Zsolt Biometric identification is no longer an idea of the future, it’s a possibility of the present. It’s enough to think about everyday things like the new ID card, some laptops, and most cell phones. We can see that the use of biometric-based identification systems is growing on a large scale. Behind the rapid spread is both demand and offer. On the demand side, there is a demand for security. For example, states want to know who is crossing their borders, and companies want to know who is entering their buildings. On the supply side, compact and inexpensive devices appear that can be easily integrated into any system. Although experts believe that biometric identification can be considered extremely secure, these systems also have weaknesses. In the course of my research, I examine fingerprint-based recognition among biometric identification types in more depth. There are also two types of errors that affect system reliability. One is FAR, i.e. false acceptance, the other is FRR, i.e. false rejection. In my work, I would like to find a solution to how we can best reduce the first and second type errors (FAR and FRR) by changing the number of samples and tuning the acceptance threshold. The biggest difficulty with this is finding the EER (Equal Error Rate) point, as deviating from this point, the error rates show an increasing trend. Another topic of my research is the examination of LoRaWAN technology for reliability. The health and remote monitoring armband I designed uses LoRa communication to transmit information. The biggest advantage of the technology is the long-range, which is significantly influenced by environmental variables and current terrain conditions. I would like to find out what range the LoRa module I use can operate in different noise-laden environments, under different weather and terrain conditions. This can be used to establish a coverage area within which the exchange of information between the LoRa device and its associated gateway can be guaranteed. Wed, 01 Jan 2020 00:00:00 GMT http://hdl.handle.net/20.500.14044/40459 2020-01-01T00:00:00Z http://hdl.handle.net/20.500.14044/40458 Non-technical loss detection at unregistered points in power distribution systems Greber, Márton; Fodor, Attila; Magyar, Attila Dr. Temesvári, Zsolt In this paper a non-technical loss (NTL) diagnostic method is proposed which considers faults at unregistered points in the distribution network. The method relies on the concept of smart grid, where every consumer is equipped with smart meters. Existing line segments are split up in order to detect and isolate faults at arbitrary points between metered points. The goal is to adjust the power and distance of these nodes such that the measured voltage profile is obtained. This results in a non-linear optimization problem, which is approximated using a genetic algorithm. Based on conservation of energy a local evaluation method is worked out. This is used to reduce the enormous search space of a fully extended network. The computational burden is further relaxed by showing the applicability of parallel computation for both diagnostic techniques. Wed, 01 Jan 2020 00:00:00 GMT http://hdl.handle.net/20.500.14044/40458 2020-01-01T00:00:00Z http://hdl.handle.net/20.500.14044/40457 Epitaxiás nano-struktúrák térfogatmeghatározásának néhány aspektusa Farkas, Zoltán; Ürmös, Antal; Nemcsics, Ákos Dr. Temesvári, Zsolt Jelen munkában az epitaxiálisan növesztett nano-struktúrák térfogat- meghatározás néhány vonatkozását tárgyaljuk. A csepp-epitaxia lehetővé teszi a változatos formájú és térfogatú nanostruktúrák előállítását. Ezt a változatos formavilágot írjuk le hiperbolikus függvényekkel. A nano-struktúrák folyonos-átmenetű leírását valósítjuk meg állandó térfogat feltétel mellett a függvény-paraméter-függvények meghatározásával. Ez lehetőséget ad számunkra a térfogat analitikus meghatározására. A dolgozat végén a hiperbolikus burkológörbéjű nano-objektumok térfogatmeghatározásának néhány aspektusát említjük meg. Wed, 01 Jan 2020 00:00:00 GMT http://hdl.handle.net/20.500.14044/40457 2020-01-01T00:00:00Z