Information dissemination algorithms in space deployed ad hoc networks

Based on recent trends, in the next few years there could be a lot of cheap devices placed on the surface of different luminaries like the planet Mars instead of sending one or two expensive space-probes. If there are many cheap instruments on the surface of a planet, it is worth using ad hoc networks. For such a network, using energy saving and robust solutions is crucial. We need a local and automatic coordination because of the far distance and the delays appearing in the interplanetary communication. We have dealt with a special type of ad hoc networks and constructed an information dissemination algorithm called SPIO which can collect and exchange data on a distant planet faster than the nowadays used point-to-point systems

The 4th industrial revolution's challenges at the wood industrial manufactories

Substantial technological advances appeared in the industrial sector in the last years. Developments are based on the “Internet of things” idea, called as “Industry 4.0” in Europe. The name is referring to the phenomena that many experts think this is the fourth industrial revolution. The goal of these projects are to create live connections among all industrial machines, tools and the central units. Some techniques and tools, e.g., sensors, big data, cloud computing, 3D printing, robotics and artificial intelligence, support the IT developments also. The decision making in the industry will be automated and quick because of the new methods and tools

Az önkormányzati rendészet társadalmi megítélése a nyomtatott sajtóban

The examination of the social appraisal of the self-governmental law enforcement is a quite complicated research area. This paper examines content of the articles on self-governmental law enforcement published in the printed press and author’s attitudes determinable in the articles.Meglehetősen nehéz kutatási terület az önkormányzati rendészet társadalmi megítélésének vizsgálata. A dolgozat a média egy szegmensében, a nyomtatott sajtóban megjelenő, önkormányzati rendészettel kapcsolatos cikkek tartalmát és a cikkekben meghatározható szerzői attitűdöt vizsgálja. &nbsp

A Stepchild of the Hungarian Law Enforcement System? Function and Public Image of the Hungarian Local Governmental Law Enforcement Organizations

This paper summarizes some results of the local governmental law enforcement research in Hungary and describes the function and the public image of the Hungarian local governmental law enforcement organizations. The Hungarian law enforcement organisations in Budapest and in the city counties were researched by a complex survey. The public image of the Hungarian law enforcement organizations was examined using the most important national and county newspapers. According to the most important findings it is proved that there are some anomalies in the function and legislation of the local governmental law enforcement and the public image of the local governmental law enforcement organizations are much better in the county media than in the national media

Real-time Processing System for a Quantum Random Number Generator

Quantum random number generators (QRNG) provide quality random numbers, which are essential for cryptography by utilizing the unpredictable nature of quantum mechanics. Advancements in quantum optics made multiple different architectures for these possible. As part of a project aiming to realize a QRNG service, we developed a system capable of providing real-time monitoring and long term data collection while still fulfilling regular processing duties for these devices. In most cases, hardware validation is done by simply running a battery of statistical tests on the final output. Our goal, however, was to create a system allowing more flexible use of these tests, realizing a tool that can also prove useful during the construction of our entropy source for detecting and correcting unique imperfections. We tested this flexibility and the system’s ability to adequately perform the required tasks with simulated sources while further examining the usability of available verification tools within this new custom framework

Comparing Calculated and Measured Losses in a Satellite-Earth Quantum Channel

Long distance distribution of quantum states is necessary for quantum communication and large scale quantum experiments. Currently this distance is limited by channel loss. Previous theoretical analisys and proof of concept experiments showed that satellite quantum communication may have lower losses than optical cable based counterparts. Recently the QuESS experiment [3] realized the first satellite-Earth quantum channel. In this paper we compare heoretical predictions of different mathematical models with experimental results regarding channel loss. We examine the HV-5/7 model, HV-Night model and Greenwood model of optical turbulences, the geometric [4] and diffraction [5][6] models of beam wander and beam widening. Furthermore we take into account the effect of atmospheric gases and aerosols as well as the effect of pointing error. We find that theoretical predictions are largely in the same order of magnitude as experimental results. The exception is the diffraction model of beam spreading where our calculations yielded only one tenth of the measured value. Given the ever changing nature of weather conditions and the changing composition of atmospheric aerosoles we conclude that calculated and measured losses are in good agreement

Optical transmittance based store and forward routing in satellite networks

Quantum computing will play a crucial part in our security infrastructure for the coming years. Quantum networks can consist of direct optical fiber or free-space links. With the use of satellite channels, we can create a quantum network with higher coverage than using optical fibers where the distances are limited due to the properties of the fiber. One of the highest drivers of cost for satellite networks, apart from the cost of the technology needed for such systems, are the costs of launching and maintaining said satellites. By minimizing the satellites needed for a well-functioning quantum network, we can decrease said network’s cost, thus enabling a cheaper quantum internet. In this paper, we present an optical transmittance-based routing algorithm with which it is possible to conduct successful quantum entanglement transfer between terrestrial nodes