QCD dynamics in mesons at soft and hard scales

Using a ladder-rainbow kernel previously established for the soft scale of light quark hadrons, we explore, within a Dyson-Schwinger approach, phenomena that mix soft and hard scales of QCD. The difference between vector and axial vector current correlators is examined to estimate the four quark chiral condensate and the leading distance scale for the onset of non-perturbative phenomena in QCD. The valence quark distributions, in the pion and kaon, defined in deep inelastic scattering, and measured in the Drell Yan process, are investigated with the same ladder-rainbow truncation of the Dyson-Schwinger and Bethe-Salpeter equations.Comment: 6 pages, 1 double panel figure, invited talk presented at the Workshop on Achievements and New Directions in Subatomic Physics, Adelaide, Australia, February 2010, to be published by AIP Conf. Pro

Soft and Hard scale QCD Dynamics in Mesons

Using a ladder-rainbow kernel previously established for the soft scale of light quark hadrons, we explore the extension to masses and electroweak decay constants of ground state pseudoscalar and vector quarkonia and heavy-light mesons in the c- and b-quark regions. We make a systematic study of the effectiveness of a constituent mass concept as a replacement for a heavy quark dressed propagator. The difference between vector and axial vector current correlators is examined to estimate the four quark chiral condensate. The valence quark distributions, in the pion and kaon, defined in deep inelastic scattering, and measured in the Drell Yan process, are investigated with the same ladder-rainbow truncation of the Dyson-Schwinger and Bethe-Salpeter equations.Comment: 10 pages, 2 double panel figures, invited talk presented at the XII Mexican Workshop on Particles and Fields, Mazatlan, Sinaloa, Mexico, November 2009; to be published by AIP Conf. Pro

Vietnam Inbound M&A Activity: the Role of Government Policy and Regulatory Environment

With a robust recent history of reform and opening, joining of the World Trade Organization, and negotiating a myriad of regional and global trade agreements, Vietnam has emerged as a promising destination for foreign direct investment(FDI) and cross-border mergers and acquisitions (M&A). In this paper, we providean overview of Vietnam’s inbound mergers and acquisitions and review the twomain driving forces of inbound M&A, which are the legal framework reformprocess and the equitization of State-owned enterprises. We close by providingdirections for future research in the area of cross-border M&As

Unexpected Dirac-Node Arc in the Topological Line-Node Semimetal HfSiS

We have performed angle-resolved photoemission spectroscopy on HfSiS, which has been predicted to be a topological line-node semimetal with square Si lattice. We found a quasi-two-dimensional Fermi surface hosting bulk nodal lines, alongside the surface states at the Brillouin-zone corner exhibiting a sizable Rashba splitting and band-mass renormalization due to many-body interactions. Most notably, we discovered an unexpected Dirac-like dispersion extending one-dimensionally in k space - the Dirac-node arc - near the bulk node at the zone diagonal. These novel Dirac states reside on the surface and could be related to hybridizations of bulk states, but currently we have no explanation for its origin. This discovery poses an intriguing challenge to the theoretical understanding of topological line-node semimetals.Comment: 5 pages, 4 figures (paper proper) + 2 pages, figures (supplemental material

Towards a Taxonomy of Information Security Policy Non-Compliance Behavior

Due to the increasing digitalization of our society, IT security professionals must implement even more effective security measures to meet the growing information security requirements of their organizations. To target and effectively deploy these measures in the best possible way, they must consider different types of behaviors that might lead to information security threats. Regarding this issue, current research offers little for clarity to security professionals when it comes to understanding and differentiating the various types of behavior. Therefore, this research aims to develop a taxonomy to classify different types of information security policy non-compliance behavior. Our results present a taxonomy with five dimensions, each containing mutually exclusive and collectively exhaustive characteristics. Our results provide a basis for a more specific analysis of different types of information security policy non-compliance behavior and can be used for more comprehensive development and analysis of appropriate security measures

Spotlight Attention: Robust Object-Centric Learning With a Spatial Locality Prior

The aim of object-centric vision is to construct an explicit representation of the objects in a scene. This representation is obtained via a set of interchangeable modules called \emph{slots} or \emph{object files} that compete for local patches of an image. The competition has a weak inductive bias to preserve spatial continuity; consequently, one slot may claim patches scattered diffusely throughout the image. In contrast, the inductive bias of human vision is strong, to the degree that attention has classically been described with a spotlight metaphor. We incorporate a spatial-locality prior into state-of-the-art object-centric vision models and obtain significant improvements in segmenting objects in both synthetic and real-world datasets. Similar to human visual attention, the combination of image content and spatial constraints yield robust unsupervised object-centric learning, including less sensitivity to model hyperparameters.Comment: 16 pages, 3 figures, under review at NeurIPS 202

Chasing Cyber Security Unicorns: A Taxonomy-based Analysis of Cyber Security Start-ups’ Business Models

As the number of security incidents increases, a market is emerging for established and new providers of security measures. However, we lack an idea of the business models of cyber security start-ups, which are seen as innovation and security drivers, to protect the economy from existence-threatening incidents. Due to the intangible nature of the cyber threats that security solutions aim to address, previous research on business models cannot be fully transferred. We address this research gap by developing a taxonomy following Nickerson et al. (2013) based on 90 cyber security start-ups and performing a cluster analysis to understand the business activities of cyber security start-ups concerning the protection of critical infrastructures. Our taxonomy will benefit interested decision-makers such as CISOs who want to identify custom-fit cyber security solutions for their organizations. Furthermore, investors and cyber security providers understand the market holistically and can identify innovative product approaches to adopt themselves

Modeling of Interstellar Scintillation Arcs from Pulsar B1133+16

The parabolic arc phenomenon visible in the Fourier analysis of the scintillation spectra of pulsars provides a new method of investigating the small scale structure in the ionized interstellar medium (ISM). We report archival observations of the pulsar B1133+16 showing both forward and reverse parabolic arcs sampled over 14 months. These features can be understood as the mutual interference between an assembly of discrete features in the scattered brightness distribution. By model-fitting to the observed arcs at one epoch we obtain a ``snap-shot'' estimate of the scattered brightness, which we show to be highly anisotropic (axial ratio >10:1), to be centered significantly off axis and to have a small number of discrete maxima, which are coarser the speckle expected from a Kolmogorov spectrum of interstellar plasma density. The results suggest the effects of highly localized discrete scattering regions which subtend 0.1-1 mas, but can scatter (or refract) the radiation by angles that are five or more times larger.Comment: 14 pages, 4 figures, submitted to Astrophysical Journa