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  • Publication . Article . Preprint . 2017
    Open Access English
    Authors: 
    Baykal, Cenk; Liebenwein, Lucas; Schwarting, Wilko;

    We present a novel coreset construction algorithm for solving classification tasks using Support Vector Machines (SVMs) in a computationally efficient manner. A coreset is a weighted subset of the original data points that provably approximates the original set. We show...

  • Publication . Article . Preprint . 2015
    Open Access English
    Authors: 
    Fabiana Zollo; Alessandro Bessi; Michela Del Vicario; Antonio Scala; Guido Caldarelli; Louis M. Shekhtman; Shlomo Havlin; Walter Quattrociocchi;
    Publisher: Public Library of Science
    Country: Italy
    Project: EC | DOLFINS (640772), EC | SoBigData (654024), EC | MULTIPLEX (317532), EC | SIMPOL (610704)

    Recently a simple military exercise on the Internet was perceived as the beginning of a new civil war in the US. Social media aggregate people around common interests eliciting a collective framing of narratives and worldviews. However, the wide availability of user-pro...

  • Open Access English
    Authors: 
    Yakubo, K.; Saijo, S.; Koro��ak, D.;

    Using a geographical scale-free network to describe relations between people in a city, we explain both superlinear and sublinear allometric scaling of urban indicators that quantify activities or performances of the city. The urban indicator $Y(N)$ of a city with the p...

  • Publication . Article . Preprint . 2008
    Open Access English
    Authors: 
    Marko Žnidarič; Tomaž Prosen; Iztok Pižorn;

    We study quantum correlations and complexity of simulation, characterized by quantum mutual information and entanglement entropy in operator space respectively, for thermal states in critical, non-critical and quantum chaotic spin chains. A simple general relation betwe...

  • Publication . Preprint . 2006
    Open Access English
    Authors: 
    Fang, F.;

    We report a search for the $h_c$ meson via the decay chain $B^{\pm}\to h_c K^{\pm}$, $\etac \gamma$ with $\eta_c \to K_S^0 K^{\pm} \pi^{\mp}$ and $p\bar{p}$. No significant signals are observed. We obtain upper limits on the branching fractions for $B^{\pm} \to \eta_c\g...

  • Open Access English
    Authors: 
    Jan Fidrmuc; Victor Ginsburgh;
    Country: Belgium

    The European Union has recently expanded from 15 to 25 countries, bringing the number of official languages to 20. Currently, the EU extends equal treatment to all member countries’ official languages. This, however, is costly, especially since many Europeans speak one ...

  • Open Access English
    Authors: 
    Caroline Soubiran; Gérard Jasniewicz; Laurent Chemin; C. Zurbach; N. Brouillet; Pasquale Panuzzo; P. Sartoretti; D. Katz; J. F. Le Campion; O. Marchal; +32 more
    Countries: Belgium, France

    Aims. The Radial Velocity Spectrometer (RVS) on board the ESA satellite mission Gaia has no calibration device. Therefore, the radial velocity zero point needs to be calibrated with stars that are proved to be stable at a level of 300 m/s during the Gaia observations. M...

  • Publication . Article . Preprint . 2019
    Open Access English
    Authors: 
    Xu, Kexiang; Ili��, Aleksandar; Ir��i��, Vesna; Klav��ar, Sandi; Li, Huimin;

    The transmission of a vertex $v$ of a graph $G$ is the sum of distances from $v$ to all the other vertices in $G$. The Wiener complexity of $G$ is the number of different transmissions of its vertices. Similarly, the eccentric complexity of $G$ is defined as the number ...

  • Publication . Article . Preprint . 2004
    Open Access English
    Authors: 
    Prosen, Tomaz; Shepelyansky, Dima;
    Publisher: HAL CCSD
    Country: France

    We establish analogy between a microwave ionization of Rydberg atoms and a charge transport through a chaotic quantum dot induced by a monochromatic field in a regime with a potential barrier between dot contacts. We show that the quantum coherence leads to dynamical lo...

  • Publication . Other literature type . Article . Preprint . 2006
    Open Access English
    Authors: 
    Friedrich Hegenbarth; Dušan Repovš;

    The validity of Freedman's disk theorem is known to depend only on the fundamental group. It was conjectured that it fails for nonabelian free fundamental groups. If this were true then surgery theory would work in dimension four. Recently, Krushkal and Lee proved a sur...