Suchergebnisse

The main purpose of this paper is to identify the impact of public spending on education and research and development (R&D) on the formation of gross domestic product (GDP) in nine Central European countries, which are divided into two clusters – "old" and "new" EU members. The study took into account official Eurostat data of both the EU and national statistical organizations for the period 2010–2019. The analysis of this impact was carried out using a system approach, statistics and econometric framework including panel data regression, Wald, Breusch-Pagan, Hausman tests. The main finding of the present study is the identification of additional income in terms of GDP in Euro per capita for selected countries, which is obtained from adequately spent public funds for education and R&D. Our results showed that the strongest influence of these expenditures for the "old" members was in Germany and Austria, and for the "new" – in Slovenia and Czechia. It is proved that this impact is different in individual countries and is determined by the public financial policy of national governments.

Blockchain is a distributed database which is cryptographically protected against malicious modifications. While promising for a wide range of applications, current blockchain platforms rely on digital signatures, which are vulnerable to attacks by means of quantum computers. The same, albeit to a lesser extent, applies to cryptographic hash functions that are used in preparing new blocks, so parties with access to quantum computation would have unfair advantage in procuring mining rewards. Here we propose a possible solution to the quantum era blockchain challenge and report an experimental realization of a quantum-safe blockchain platform that utilizes quantum key distribution across an urban fiber network for information-theoretically secure authentication. These results address important questions about realizability and scalability of quantum-safe blockchains for commercial and governmental applications.