578 research outputs found

    ADN: An Information-Centric Networking Architecture for the Internet of Things

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    Forwarding data by name has been assumed to be a necessary aspect of an information-centric redesign of the current Internet architecture that makes content access, dissemination, and storage more efficient. The Named Data Networking (NDN) and Content-Centric Networking (CCNx) architectures are the leading examples of such an approach. However, forwarding data by name incurs storage and communication complexities that are orders of magnitude larger than solutions based on forwarding data using addresses. Furthermore, the specific algorithms used in NDN and CCNx have been shown to have a number of limitations. The Addressable Data Networking (ADN) architecture is introduced as an alternative to NDN and CCNx. ADN is particularly attractive for large-scale deployments of the Internet of Things (IoT), because it requires far less storage and processing in relaying nodes than NDN. ADN allows things and data to be denoted by names, just like NDN and CCNx do. However, instead of replacing the waist of the Internet with named-data forwarding, ADN uses an address-based forwarding plane and introduces an information plane that seamlessly maps names to addresses without the involvement of end-user applications. Simulation results illustrate the order of magnitude savings in complexity that can be attained with ADN compared to NDN.Comment: 10 page

    Contribution of α2\alpha^2-terms to the total interaction cross sections of relativistic elementary atoms with atoms of matter

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    It is shown that the corrections of α2\alpha^2 order to the total cross sections for interaction of elementary hydrogen-like atoms with target atoms, reported in the previously published paper [S.Mrowczynski, Phys.Rev. D36, 1520 (1987)], do not include some terms of the same order of magnitude. That results in a significant contribution of these corrections in particular cases. The full α2\alpha^2-corrections have been derived and it is shown that they are really small and could be omitted for most practical applications.Comment: 5 page

    Study of the physical properties of crystalline rocks in the southeast Voronezh anteclise

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    The physical properties of rocks, in the crystalline mass of the Voronezh anteclise, were studied. The study of the physical properties of rocks is important for the improvement of geophysical methods for mapping crystalline rocks in the foundation and exploration of different geological objects which are associated with the crystalline foundation, covered by the sedimentary mantle. It is found that: (1) rocks in the crystalline foundation are very different in physical properties; (2) the physical properties are closely related to their substance composition and genesis; (3) petrographic properties give clues of rock afficiation to certain complexes; and (4) physical and magnetic properties should be examined by petrography, chemical and X-ray analysis

    Covert Ephemeral Communication in Named Data Networking

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    In the last decade, there has been a growing realization that the current Internet Protocol is reaching the limits of its senescence. This has prompted several research efforts that aim to design potential next-generation Internet architectures. Named Data Networking (NDN), an instantiation of the content-centric approach to networking, is one such effort. In contrast with IP, NDN routers maintain a significant amount of user-driven state. In this paper we investigate how to use this state for covert ephemeral communication (CEC). CEC allows two or more parties to covertly exchange ephemeral messages, i.e., messages that become unavailable after a certain amount of time. Our techniques rely only on network-layer, rather than application-layer, services. This makes our protocols robust, and communication difficult to uncover. We show that users can build high-bandwidth CECs exploiting features unique to NDN: in-network caches, routers' forwarding state and name matching rules. We assess feasibility and performance of proposed cover channels using a local setup and the official NDN testbed

    Niels Bohr’s principle of complementarities in political economy

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    The development of the principle of complementarity by a well-known Danish physical scientist N. Bohr was the outstanding achievement of philosophical idea, having prime value to explain quantum mechanics phenomena and biological and social (including economic) phenomena sufficiently differing from them. This principle focuses the attention of the researchers on revelation of dualistic, dialectically contradictory essence of the phenomenon studied. Such task cannot be solved using some single category whatever significant and universal it is. Three categories shall be used for this. One for designation of a basic phenomenon per se, two others to describe additional properties, revealing dualistic, dialectically contradictory essence of the phenomenon studied. Such approach allows developing the required theoretic and methodological tools to study dualistic, contradictory nature of economic phenomena and processes as a two-pole model of the economic phenomenon (ABC model), embodying the principle of complementarity in political economy. This model may be used as a tool for critical analysis of conceptual framework of economics and development of scientific novelty. The article shows that theoretic interpretation of many economic phenomena has stood the test from ABC model position, some of them could not overcome such a test. These are, for example: nominal salary, labour productivity, marketing and advertising. Analysis using ABC model revealed that their widespread theoretical interpretations ignore the essential characteristics of these phenomena. The principle of complementarity which fixed inherent dualistic dialectically contradictory structure as the required step of cognition of nature and society phenomena essence plays the most important methodological role in the analysis of economic phenomena.peer-reviewe

    Model of Economic Phenomenon

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    As is known, economic phenomena represent the most important part of the subject of economic science. However, modern economic theory avoids a clear definition of this category. Thus, it remains unclear what is economic phenomena, and thus the economy is in its essence as suc

    Dynamics of the Pionium with the Density Matrix Formalism

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    The evolution of pionium, the π+π\pi^+ \pi^- hydrogen-like atom, while passing through matter is solved within the density matrix formalism in the first Born approximation. We compare the influence on the pionium break-up probability between the standard probabilistic calculations and the more precise picture of the density matrix formalism accounting for interference effects. We focus our general result in the particular conditions of the DIRAC experiment at CERN.Comment: 14 pages, 2 figures, submitted to J. Phys. B: At. Mol. Phy

    The multilevel trigger system of the DIRAC experiment

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    The multilevel trigger system of the DIRAC experiment at CERN is presented. It includes a fast first level trigger as well as various trigger processors to select events with a pair of pions having a low relative momentum typical of the physical process under study. One of these processors employs the drift chamber data, another one is based on a neural network algorithm and the others use various hit-map detector correlations. Two versions of the trigger system used at different stages of the experiment are described. The complete system reduces the event rate by a factor of 1000, with efficiency \geq95% of detecting the events in the relative momentum range of interest.Comment: 21 pages, 11 figure

    The Coulomb Interaction between Pion-Wavepackets: The piplus-piminus Puzzle

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    The time dependent Schr\"odinger equation for π+\pi^+--π\pi^- pairs, which are emitted from the interaction zone in relativistic nuclear collisions, is solved using wavepacket states. It is shown that the Coulomb enhancement in the momentum correlation function of such pairs is smaller than obtained in earlier calculations based on Coulomb distorted plane waves. These results suggest that the experimentally observed positive correlation signal cannot be caused by the Coulomb interaction between pions emitted from the interaction zone. But other processes which involve long-lived resonances and the related extended source dimensions could provide a possible explanation for the observed signal.Comment: 12 pages, LaTeX, 1 figur
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