405 research outputs found

    Security and Privacy for Modern Wireless Communication Systems

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    The aim of this reprint focuses on the latest protocol research, software/hardware development and implementation, and system architecture design in addressing emerging security and privacy issues for modern wireless communication networks. Relevant topics include, but are not limited to, the following: deep-learning-based security and privacy design; covert communications; information-theoretical foundations for advanced security and privacy techniques; lightweight cryptography for power constrained networks; physical layer key generation; prototypes and testbeds for security and privacy solutions; encryption and decryption algorithm for low-latency constrained networks; security protocols for modern wireless communication networks; network intrusion detection; physical layer design with security consideration; anonymity in data transmission; vulnerabilities in security and privacy in modern wireless communication networks; challenges of security and privacy in node–edge–cloud computation; security and privacy design for low-power wide-area IoT networks; security and privacy design for vehicle networks; security and privacy design for underwater communications networks

    LIPIcs, Volume 261, ICALP 2023, Complete Volume

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    LIPIcs, Volume 261, ICALP 2023, Complete Volum

    STAB-Jahresbericht 2023 - Proceedings of the 21st STAB-Workshop 2023 in Göttingen

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    Die STAB-Jahresberichte werden als Sammlung der Kurzfassungen der VortrĂ€ge an die Teilnehmer der abwechselnd stattfindenden Symposien und Workshops verteilt. So erscheint der vorliegende STAB-Jahresbericht 2023 anlĂ€sslich des 21. STAB-Workshops, der am 7. und 8. November 2023 in Göttingen stattfinden wird. Der Bericht enthĂ€lt 77 Mitteilungen ĂŒber Arbeiten aus den Fachgruppen, die auf dem Workshop vorgestellt werden. Den Mitteilungen ist ein Inhaltsverzeichnis (Seite 14 bis Seite 19) vorangestellt, das nach Fachgruppen gegliedert ist. Innerhalb der Fachgruppen sind die BeitrĂ€ge alphabetisch nach Autoren geordnet. Die BeitrĂ€ge verteilen sich (bezogen auf die Erstautoren) zu 4 % auf die Industrie, zu 39 % auf Hochschulen und zu 57 % auf Forschungseinrichtungen (DLR, DNW, ISL). Die Autoren und Koautoren dieses Berichts sind auf den Seiten 174 und 175 aufgefĂŒhrt

    LIPIcs, Volume 274, ESA 2023, Complete Volume

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    LIPIcs, Volume 274, ESA 2023, Complete Volum

    LIPIcs, Volume 258, SoCG 2023, Complete Volume

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    LIPIcs, Volume 258, SoCG 2023, Complete Volum

    The Fifteenth Marcel Grossmann Meeting

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    The three volumes of the proceedings of MG15 give a broad view of all aspects of gravitational physics and astrophysics, from mathematical issues to recent observations and experiments. The scientific program of the meeting included 40 morning plenary talks over 6 days, 5 evening popular talks and nearly 100 parallel sessions on 71 topics spread over 4 afternoons. These proceedings are a representative sample of the very many oral and poster presentations made at the meeting.Part A contains plenary and review articles and the contributions from some parallel sessions, while Parts B and C consist of those from the remaining parallel sessions. The contents range from the mathematical foundations of classical and quantum gravitational theories including recent developments in string theory, to precision tests of general relativity including progress towards the detection of gravitational waves, and from supernova cosmology to relativistic astrophysics, including topics such as gamma ray bursts, black hole physics both in our galaxy and in active galactic nuclei in other galaxies, and neutron star, pulsar and white dwarf astrophysics. Parallel sessions touch on dark matter, neutrinos, X-ray sources, astrophysical black holes, neutron stars, white dwarfs, binary systems, radiative transfer, accretion disks, quasars, gamma ray bursts, supernovas, alternative gravitational theories, perturbations of collapsed objects, analog models, black hole thermodynamics, numerical relativity, gravitational lensing, large scale structure, observational cosmology, early universe models and cosmic microwave background anisotropies, inhomogeneous cosmology, inflation, global structure, singularities, chaos, Einstein-Maxwell systems, wormholes, exact solutions of Einstein's equations, gravitational waves, gravitational wave detectors and data analysis, precision gravitational measurements, quantum gravity and loop quantum gravity, quantum cosmology, strings and branes, self-gravitating systems, gamma ray astronomy, cosmic rays and the history of general relativity

    ATHENA Research Book, Volume 2

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    ATHENA European University is an association of nine higher education institutions with the mission of promoting excellence in research and innovation by enabling international cooperation. The acronym ATHENA stands for Association of Advanced Technologies in Higher Education. Partner institutions are from France, Germany, Greece, Italy, Lithuania, Portugal and Slovenia: University of OrlĂ©ans, University of Siegen, Hellenic Mediterranean University, NiccolĂČ Cusano University, Vilnius Gediminas Technical University, Polytechnic Institute of Porto and University of Maribor. In 2022, two institutions joined the alliance: the Maria Curie-SkƂodowska University from Poland and the University of Vigo from Spain. Also in 2022, an institution from Austria joined the alliance as an associate member: Carinthia University of Applied Sciences. This research book presents a selection of the research activities of ATHENA University's partners. It contains an overview of the research activities of individual members, a selection of the most important bibliographic works of members, peer-reviewed student theses, a descriptive list of ATHENA lectures and reports from individual working sections of the ATHENA project. The ATHENA Research Book provides a platform that encourages collaborative and interdisciplinary research projects by advanced and early career researchers

    Theoretical sketches on fluvial and tidal morphodynamics

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    The dynamic interaction between a sediment-carrying fluid and the erodible Earth's surface is responsible for the formation of a variety of sedimentary patterns. These morphological features manifest across a broad range of spatial and temporal scales, often showing a high degree of regularity. Here, the attention is restricted to some fluvial and tidal sedimentary patterns. While fluvial patterns populate streams flowing downhill from mountain valleys to low-lying plains, tidal patterns form in coastal regions like estuaries, lagoons, and deltas. Recognizing that morphological patterns share the same basic elements, the development of simplified mechanistic models that relies on universal mathematical approaches like dimensional analysis and perturbation methods is pursued. In first place, several morphodynamic problems focusing on multi-thread streams are addressed. In these patterns, the downstream routing of water and sediment is fundamentally directed by channel bifurcations, morphological features where a main thread splits into two smaller anabranches. It is investigated the potential role of tides in controlling the long-term equilibrium state of riverine deltas. To this aim, an idealized tree-like delta network with multiple bifurcations is formulated. It is shown how, even if controlled by few simple interactions, the model behaves as a complex system, where tides can be either a stabilizing or a destabilizing factor for the asymptotic equilibrium state. Then, it is discussed how river bifurcations can be interpreted as a classical phase transition phenomena like the spontaneous magnetization of a ferromagnetic material. This is shown through a fully analytical treatment, which ultimately allows to explicitly compute the flow distribution and bed topography at the bifurcation node. Subsequently, it is explored the role of sediment heterogeneity on stability conditions and equilibrium configurations of fluvial bifurcations, by extending a consolidated modeling framework to deal with mixtures. Ultimately, the spatial structure of looping systems is examined. Indeed, sometimes multi-thread patterns display flow splitting among two smaller anabranches that reconnect further downstream at a channel confluence. Through a systematic field data analysis, it is shown that the average length of the anabranches is not randomly distributed, but follows quasi-universal relations regardless of the specific climatic and geologic context of single rivers. These relations indicate that the length of channel anabranches is slope-invariant and directly proportional to bankfull hydraulic geometry variables (i.e., width and depth) of the main thread. A mechanistic justification of the observed relations is then proposed on the basis of a recent theoretical framework, which is found on the idea of a two-way morphodynamic interaction occurring between bifurcation and confluence nodes. The central part of the thesis analyzes the formation of both free and forced alternate bars, namely meso-scale bedforms characterized by a repetitive sequence of scour pools and sediment deposits. While free bars arise spontaneously due to an instability of the fluid-bed interface, forced bars are triggered by external factors affecting the boundary conditions of the system. Initially, the study of free bars development is restricted to coastal settings as tidal channels, which are distinguished by the absence of a fluvial source of freshwater and sediment, and estuaries, namely rivers debouching into open sea. It is shown how the study of tidal bars formation in these environments can be framed within the same theoretical framework. Then, it is analyzed the influence of sediment sorting on fluvial forced bars. The analysis enables to underline the close relationship between forced bars formation and channel bifurcations in sediment mixtures. The last part of the thesis deals with meandering streams flowing through permafrost floodplains. When the river banks are composed by perennially frozen material, a problem then arises of defining proper reference hydraulic and thermodynamic conditions that can represent the long-term migration of the stream. Through a simplified statistical approach, an erodibility coefficient, which retains the seasonal variability of flow and thermal regime, and physically embodying the cumulative effect of thermo-mechanical processes as ablation, is defined. The analytical model is tested on some Alaskan rivers. A preliminary qualitative analysis suggests that theoretical predictions are in good agreement with field data

    Quantum dots for photonic quantum information technology

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    The generation, manipulation, storage, and detection of single photons play a central role in emerging photonic quantum information technology. Individual photons serve as flying qubits and transmit the quantum information at high speed and with low losses, for example between individual nodes of quantum networks. Due to the laws of quantum mechanics, quantum communication is fundamentally tap-proof, which explains the enormous interest in this modern information technology. On the other hand, stationary qubits or photonic states in quantum computers can potentially lead to enormous increases in performance through parallel data processing, to outperform classical computers in specific tasks when quantum advantage is achieved. Here, we discuss in depth the great potential of quantum dots (QDs) in photonic quantum information technology. In this context, QDs form a key resource for the implementation of quantum communication networks and photonic quantum computers because they can generate single photons on-demand. Moreover, QDs are compatible with the mature semiconductor technology, so that they can be integrated comparatively easily into nanophotonic structures, which form the basis for quantum light sources and integrated photonic quantum circuits. After a thematic introduction, we present modern numerical methods and theoretical approaches to device design and the physical description of quantum dot devices. We then present modern methods and technical solutions for the epitaxial growth and for the deterministic nanoprocessing of quantum devices based on QDs. Furthermore, we present the most promising concepts for quantum light sources and photonic quantum circuits that include single QDs as active elements and discuss applications of these novel devices in photonic quantum information technology. We close with an overview of open issues and an outlook on future developments.Comment: Copyright 2023 Optica Publishing Group. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibite
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