African University of Science and Technology: Recent submissions

Now showing items 1641-1660 of 4824

  • Technological Considerations for Devs-Based System Control 

    Ifebude, Barnabas Chukwudike (2016-06-15)
    System control has grown from manual control where humans sense the environment, analyse the result and determine control actions to semi-automated control. In semi-automated control sensing is done by sensing devices and ...

  • Accelerating radio transient detection using the Bispectrum algorithm and GPGPU 

    Lin, Tsu-Shiuan (University of Cape TownFaculty of ScienceDepartment of Computer Science, 2015)
    Modern radio interferometers such as those in the Square Kilometre Array (SKA) project are powerful tools to discover completely new classes of astronomical phenomena. Amongst these phenomena are radio transients. Transients ...

  • Pattern formation in chemically interacting active rotors with self-propulsion 

    Liebchen, B; Cates, Michael Elmhirst; Marenduzzo, D (Royal Society of ChemistrySoft Matter, 2016-09-21)
    We demonstrate that active rotations in chemically signalling particles, such as autochemotactic $\textit{E. coli}$ close to walls, create a route for pattern formation based on a nonlinear yet deterministic instability ...

  • Effects of Adhesion and Deformation on Stretchable Electronic Structures 

    Oyewole, Oluwaseun Kehinde (2015-11-15)
    This work presents the results of a combined experimental, computational and analytical study of the effects of adhesion and deformation on stretchable electronic structures. First, atomic force microscopy is used to measure ...

  • On the Effect of Surface Texture and Nanoscale Surface Oxides on the Optical and Mechanical Properties of Silicon Single Crystals and MEMS Thin films 

    Fashina, Adebayo Adeboye (2015-11-15)
    This dissertation presents the combined results of analytical, computational and experimental study of the effects of surface texture and nanoscale surface oxides on the optical and mechanical properties of silicon single ...

  • Ten questions about natural ventilation of non-domestic buildings 

    Carrilho da Graça, G; Linden, Paul Frederick (ElsevierBuilding and Environment, 2016-10)
    Throughout history, natural ventilation has remained the preferred choice for the majority of residential buildings, while, in commercial buildings, natural ventilation went from being the single option to somewhat of a ...

  • Classification and Reconstruction of High-Dimensional Signals from Low-Dimensional Features in the Presence of Side Information 

    Renna, Francesco; Wang, L; Yuan, X; Yang, J; Reeves, G; Calderbank, R; Carin, L; Rodrigues, M (IEEEIEEE Transactions on Information Theory, 2016-09-07)
    This paper offers a characterization of fundamental limits on the classification and reconstruction of high-dimensional signals from low-dimensional features, in the presence of side information. We consider a scenario ...

  • Optimized finite-difference (DRP) schemes perform poorly for decaying or growing oscillations 

    Brambley, Edward James (ElsevierJournal of Computational Physics, 2016-08-11)
    Computational aeroacoustics often use finite difference schemes optimized to require relatively few points per wavelength; such optimized schemes are often called Dispersion Relation Preserving (DRP). Similar techniques ...

  • On the survival of zombie vortices in protoplanetary discs 

    Lesur, Geoffroy RJ; Latter, Henrik Nils (Oxford University PressMonthly Notices of the Royal Astronomical Society, 2016-09-06)
    Recently it has been proposed that the zombie vortex instability (ZVI) could precipitate hydrodynamical activity and angular momentum transport in unmagnetized regions of protoplanetary discs, also known as ‘dead zones’. ...

  • Media Query Processing for the Internet-of-Things: Coupling of Device Energy Consumption and Cloud Infrastructure Billing 

    Renna, Francesco; Doyle, J; Giotsas, V; Andreopoulos, Y (IEEEIEEE Transactions on Multimedia, 2016-12-01)
    Audio/visual recognition and retrieval applications have recently garnered significant attention within Internet-of-Things (IoT) oriented services, given that video cameras and audio processing chipsets are now ubiquitous ...

  • Nonhyperbolic free-by-cyclic and one-relator groups 

    Button, Jack; Kropholler, RP (New York Journal of MathematicsNew York Journal of Mathematicshttp://nyjm.albany.edu/j/2016/22-35.html, 2016-08-01)
    We show that the free-by-cyclic groups of the form $F_2$ $\rtimes$ $\Bbb Z$ act properly cocompactly on CAT(0) square complexes. We also show using generalized Baumslag–Solitar groups that all known groups defined by a ...

  • Interactive simulation and rendering of fluids on graphics hardware 

    Silson, Shaun (University of Cape TownFaculty of ScienceDepartment of Computer Science, 2016)
    Computational uid dynamics can be used to reproduce the complex motion of fluids for use in computer graphics, but the simulation and rendering are both highly computationally intensive. In the past performing these tasks ...

  • Automating user privacy policy recommendations in social media 

    Abuelgasim, Ammar (University of Cape TownFaculty of ScienceDepartment of Computer Science, 2016)
    Most Social Media Platforms (SMPs) implement privacy policies that enable users to protect their sensitive information against privacy violations. However, observations indicate that users find these privacy policies ...

  • How old are you, really? Communicating chronic risk through ‘effective age’ of your body and organs 

    Spiegelhalter, David John (BioMed CentralBMC Medical Informatics and Decision Making, 2016-08-05)
    In communicating chronic risks, there is increasing use of a metaphor that can be termed ‘effective-age’: the age of a ‘healthy’ person who has the same risk profile as the individual in question. Popular measures include ...

  • Universal Charge Diffusion and the Butterfly Effect in Holographic Theories 

    Blake, Mike (American Physical SocietyPhysical Review Letters, 2016-08-23)
    We study charge diffusion in holographic scaling theories with a particle-hole symmetry. We show that these theories have a universal regime in which the diffusion constant is given by D$_{c}$ = Cv$^{2}$$_{B}$/(2πT), where ...

  • Adoption of a visual model for temporal database representation 

    Shunmugam, Tamindran (University of Cape TownFaculty of ScienceDepartment of Computer Science, 2016)
    Today, in the world of information technology, conceptual model representation of database schemas is challenging for users both in the Software Development Life Cycle (SDLC) and the Human-Computer Interaction (HCI) domain. ...

  • Procedurally generated realistic virtual rural worlds 

    Long, Harry (University of Cape TownFaculty of ScienceDepartment of Computer Science, 2016)
    Manually creating virtual rural worlds is often a difficult and lengthy task for artists, as plant species selection, plant distributions and water networks must be deduced such that they realistically reflect the environment ...

  • Matrix model for non-Abelian quantum Hall states 

    Dorey, Nicholas; Tong, David; Turner, Carl (American Physical SocietyPhysical Review B, 2016-08-09)
    We propose a matrix quantum mechanics for a class of non-Abelian quantum Hall states. The model describes electrons which carry an internal SU($p$) spin. The ground states of the matrix model include spin-singlet generalizations ...

  • A matrix model for WZW 

    Dorey, Nicholas; Tong, David; Turner, Carl (SpringerJournal of High Energy Physics, 2016-08-01)
    We study a U($\small N$) gauged matrix quantum mechanics which, in the large $\small N$ limit, is closely related to the chiral WZW conformal field theory. This manifests itself in two ways. First, we construct the left-moving ...

  • Adaptive Bayesian Agents: Enabling distributed social networks 

    Potgieter, A (University of Cape TownFaculty of ScienceDepartment of Computer Science, 2006)
    This article brings together two views of organisations: resource-based theories (RBT) and social network analysis (SNA). Resource-based theories stress the importance of tangible assets, as well as less tangible ones, ...