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- 저자 : Filatova, Taisia G. (검색결과 2 건)
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Overview and empirical analysis of wealth decentralization in blockchain networks
Juodis Mindaugas,Filatovas Ernestas,Paulavičius Remigijus 한국통신학회 2024 ICT Express Vol.10 No.2
The decentralization paradigm has made blockchain one of the most disruptive technologies today. When evaluating the level of decentralization, the key metric for most public blockchain networks is the degree of decentralization of the resources responsible for determining who generates the blocks. In turn, it facilitates a greater understanding of both security and scalability on a blockchain. This work provides an overview of the current state-of-the-art on wealth decentralization, which has not yet received the attention it deserves. We collect data, calculate various wealth decentralization metrics, and compare our results with research on the same methodology. As the amount of data for various blockchains increases rapidly, it is helpful to have techniques to aggregate data for statistical analysis. We introduce and provide conservative estimates of decentralized group metrics based on the reduced data and compare them with full-data measurements. Our research considers both the Layer 1 blockchains of Bitcoin and Ethereum, along with Layer 2 blockchains such as Arbitrum, Optimism, and Polygon.
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A novel quasi-one-dimensional topological insulator in bismuth iodide β-Bi<sub>4</sub>I<sub>4</sub>
Autè,s, Gabriel,Isaeva, Anna,Moreschini, Luca,Johannsen, Jens C.,Pisoni, Andrea,Mori, Ryo,Zhang, Wentao,Filatova, Taisia G.,Kuznetsov, Alexey N.,Forró,, Lá,szló,Van den Broek, Nature Publishing Group, a division of Macmillan P 2016 NATURE MATERIALS Vol.15 No.2
Recent progress in the field of topological states of matter has largely been initiated by the discovery of bismuth and antimony chalcogenide bulk topological insulators (TIs; refs ,,,), followed by closely related ternary compounds and predictions of several weak TIs (refs ,,). However, both the conceptual richness of Z<SUB>2</SUB> classification of TIs as well as their structural and compositional diversity are far from being fully exploited. Here, a new Z<SUB>2</SUB> topological insulator is theoretically predicted and experimentally confirmed in the β-phase of quasi-one-dimensional bismuth iodide Bi<SUB>4</SUB>I<SUB>4</SUB>. The electronic structure of β-Bi<SUB>4</SUB>I<SUB>4</SUB>, characterized by Z<SUB>2</SUB> invariants (1;110), is in proximity of both the weak TI phase (0;001) and the trivial insulator phase (0;000). Our angle-resolved photoemission spectroscopy measurements performed on the (001) surface reveal a highly anisotropic band-crossing feature located at the point of the surface Brillouin zone and showing no dispersion with the photon energy, thus being fully consistent with the theoretical prediction.
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