Enhancing the Kademlia P2P Network

Distributed Hash Tables (DHT´s) are sophisticated Peer-to-Peer (P2P) overlay networks. Such overlays have the ability to retrieve stored data in a limited time, usually in a logarithmic number of steps. However in contrast to the well-known Gnutella and FastTrack networks, these can only locate data quickly, if the key associated with the data requested is accurately specified. In this article we analyze the reliability of the Kademlia network, and describe our model, which can be used to determine its system-wide configuration parameters. We also present a novel algorithm that implements broadcast messages in Kademlia. The developed algorithm ensures reliable delivery of broadcast messages in an error prone environment. Broadcast messaging is an elementary service in an overlay network. Using broadcast messages, queries of any key type or part of key, can be realized

Többnyelvű feliratok a Nagyszentmiklósi aranykincsen

A cikkben röviden áttekintjük a Nagyszentmiklósi aranykincs rovásfeliratai - nak kérdéskörét, majd vizsgálatunkat a kincs azon tárgyaira szűkítjük, amelyeken többnyelvű rovásfeliratok láthatók – abban a reményben, hogy az azonos edényeken található, de különböző nyelveken készült feliratok valószínűleg hasonló tartalmú - ak. Végül a számítógépes paleográfia eszközeinek felhasználásával az olvasatok - hoz felhasznált ábécé egyes grafémái származásának vizsgálatáva l foglalkozunk

Scriptinformatics

Scripts (writing systems) usually belong to specific languages and have temporal, spatial and cultural characteristics. The evolution of scripts has been the subject of research for a long time. This is probably because the long-term development of human thinking is reflected in the surviving script relics, many of which are still undeciphered today. The book presents the study of the script evolution with the mathematical tools of systematics, phylogenetics and bioinformatics. In the research described, the script is the evolutionary taxonomic unit (taxon), which is analogous to the concept of biological species. Among the methods of phylogenetics, phenetics classifies the investigated taxa on the basis of their morphological similarity, and does not primarily examine genealogical relationships. Due to the scarcity of morphological diversity of scripts’ features, random coincidences of evolution-independent features are much more common in scripts than in biological species, thus phenetic modelling based solely on morphological features can lead to erroneous results. For this reason, phenetic modeling has been extended with evolutionary considerations, thereby allowing the modelling uncertainties observed in the script evolution to be addressed due to the large number of random coincidences (homoplasies) characterizing each script. The book describes an extended phenetic method developed to investigate the script evolution. This data-driven approach helps to reduce the impact of the uncertainties inherent in the phenetic model due to the large number of homoplasies that occur during the evolution of scripts. The elaborated phenetic and evolutionary analyses were applied to the Rovash scripts used on the Eurasian Steppe (Grassland), including the Turkic Rovash (Turkic Runic/runiform) and the Székely-Hungarian Rovash. The evaluation of the extended phenetic model of the scripts, the various phenograms, the script spectra and the group spectra helped to reconstruct the main ancestors and evolutionary stages of the investigated scripts

A proposed synthesis method for Application-Specific Instruction Set Processors

Due to the rapid technology advancement in integrated circuit era, the need for the high computation performance together with increasing complexity and manufacturing costs has raised the demand for high-performance con fi gurable designs; therefore, the Application-Speci fi c Instruction Set Processors (ASIPs) are widely used in SoC design. The automated generation of software tools for ASIPs is a commonly used technique, but the automated hardware model generation is less frequently applied in terms of fi nal RTL implementations. Contrary to this, the fi nal register-transfer level models are usually created, at least partly, manually. This paper presents a novel approach for automated hardware model generation for ASIPs. The new solution is based on a novel abstract ASIP model and a modeling language (Algorithmic Microarchitecture Description Language, AMDL) optimized for this architecture model. The proposed AMDL-based pre-synthesis method is based on a set of pre-de fi ned VHDL implementation schemes, which ensure the qualities of the automatically generated register-transfer level models in terms of resource requirement and operation frequency. The design framework implementing the algorithms required by the synthesis method is also presented

Írásemlékek grafémaalakjainak térstatisztikai és fenetikai elemzése [Spatial Statistical and Phenetic Analysis of Glyphs of Script Relics].

An evolutionary computation method was elaborated to model the evo-lution of the scripts. The developed similarity feature groups contain the possi-ble lineage models of the graphemes of the examined scripts. The elaborated method was applied in the examination of the evolution of the Rovash scripts as taxons, some of the writing systems of the people of the Eurasian Steppe, including the Turkic Rovash (Turkic runiform) and the Székely-Hungarian Rovash among others. Using the phenetic model of the scripts concerned with the cladistic considerations, the analysis of the newly developed areal spec-trum, the script spectrum and the group spectrum supported the preliminary as-sumption that the four examined scripts had a single common predecessor, the so-called Proto-Rovash