This collection houses research from the Faculty of Computing and Mathematical Sciences at the University of Waikato.

  • Use of video shadow for small group interaction awareness on a large interactive display surface

    Apperley, Mark; McLeod, Laurie; Masoodian, Masood; Paine, Lance; Phillips, Malcolm; Rogers, Bill; Thomson, Kirsten (Australian Computer Society, Inc, 2003)
    This paper reports work done as part of the Large Interactive Display Surface(LIDS) project at the University of Waikato. One application of the LIDS equipment is distributed meeting support. In this context large display ...
  • Maximum margin principal components

    Luo, Xianghui; Durrant, Robert J. (2017)
    Principal Component Analysis (PCA) is a very successful dimensionality reduction technique, widely used in predictive modeling. A key factor in its widespread use in this domain is the fact that the projection of a dataset ...
  • Pushing the boundaries with bdrmapIT: mapping router ownership at internet scale

    Marder, Alexander; Luckie, Matthew John; Dhamdhere, Amogh; Huffaker, Bradley; claffy, kc; Smith, Jonathan M. (ACM, 2018)
    Two complementary approaches to mapping network boundaries from traceroute paths recently emerged [27,31]. Both approaches apply heuristics to inform inferences extracted from traceroute measurement campaigns. bdrmap [27] ...
  • Transferring sentiment knowledge between words and tweets

    Bravo-Marquez, Felipe; Frank, Eibe; Pfahringer, Bernhard (IOS Press, 2018)
    Message-level and word-level polarity classification are two popular tasks in Twitter sentiment analysis. They have been commonly addressed by training supervised models from labelled data. The main limitation of these ...
  • A virtual cocktail party: Supporting informal social interactions in a virtual conference

    Rogers, Bill; Masoodian, Masood; Apperley, Mark (ACM, 2018)
    Whilst the primary purpose of conferences is work — formal exchange and sharing of information — they almost always also include elements of play: Informal social and entertainment elements, such as receptions, dinners, ...
  • Privacy protection for health information research in New Zealand district health boards

    Yogarajan, Vithya; Mayo, Michael; Pfahringer, Bernhard (New Zealand Medical Association, 2018)
    AIM: To examine the practices used by New Zealand’s 20 district health boards (DHBs) to protect patient privacy when patient information is used for research, and particularly practices for de-identifying information. METHOD: ...
  • Congruences modulo ρ between ρ-wisted Hasse-Weil L-values

    Delbourgo, Daniel; Lei, Antonio (American Mathematical Society, 2018)
    Suppose E₁ and E₂ are semistable elliptic curves over Q with good reduction at p, whose associated weight two newforms f₁ and f₂ have congruent Fourier coefficients modulo p. Let RS(E*, ρ) denote the algebraic padic L-value ...
  • Generating species assemblages for restoration and experimentation: A new method that can simultaneously converge on average trait values and maximize functional diversity

    Laughlin, Daniel C.; Chalmandrier, Loïc; Joshi, Chaitanya; Renton, Michael; Dwyer, John M.; Funk, Jennifer L. (Wiley, 2018)
    1. Restoring resilient ecosystems in an era of rapid environmental change requires a flexible framework for selecting assemblages of species based on functional traits. However, current trait‐based models have been limited ...
  • Families of Orthogonal and Biorthogonal Polynomials on the N-Sphere

    Kalnins, Ernie G.; Miller, W., Jr.; Tratnik, M.V. (SIAM PUBLICATIONS, 1991)
    The Laplace–Beltrami eigenvalue equation $H\Phi = \lambda \Phi $ on the n-sphere is studied, with an added vector potential term motivated by the differential equations for the polynomial Lauricella functions $F_A $. The ...
  • Supremica-An Efficient Tool for Large-Scale Discrete Event Systems

    Malik, Robi; Akesson, Knut; Flordal, Hugo; Fabian, Martin (Elsevier, 2017)
    Supremica is a tool for the modelling and analysis of discrete-event control functions based on state machine models of the uncontrolled plant and specification of the desired closed-loop behaviour. The modelling framework ...
  • A data mining approach to evaluate suitability of dissolved oxygen sensor observations for lake metabolism analysis

    Muraoka, Kohji; Hanson, Paul; Frank, Eibe; Jiang, Meilan; Chiu, Kenneth; Hamilton, David P. (Wiley, 2018)
    Despite rapid growth in continuous monitoring of dissolved oxygen for lake metabolism studies, the current best practice still relies on visual assessment and manual data filtering of sensor observations by experienced ...
  • The effect of group size and communication modes in CSCW environments

    Masoodian, Masood; Apperley, Mark (IEEE Computer Society, 2006)
    An earlier study by M. Masoodian et al. (1995) has examined the impact of different human-to-human communication modes on computer supported work involving groups of two people. Based on the findings of this study an ...
  • Interactive solar panel simulation tool - from GHI to PV output

    Suppers, Joris; Apperley, Mark (University of Bamberg Press, 2017)
    The production and integration of solar panels is steadily growing in New Zealand and worldwide. The most common way to install solar panels in New Zealand is flat on top of the most north-facing roof. This method is used ...
  • Development and application of large interactive display surfaces

    Apperley, Mark; Dahlberg, Barry; Jeffries, Amos; Paine, Lance; Phillips, Malcolm; Rogers, Bill (2001)
    Recent hardware developments have made possible the construction of relatively inexpensive large interactive display surfaces (LIDS). We have built prototype systems with office whiteboard sized displays using off-the-shelf ...
  • Simulating the impact of household energy consumption on the electricity grid

    Ozoh, Patrick; Apperley, Mark (University of Bamberg Press, 2015)
    This paper presents a bottom-up modelling approach for stochastic production of electricity consumption profiles in households. It represents a preliminary work on individual appliance use modelling in households, as part ...
  • Freeform: A Tool for Sketching Form Designs

    Plimmer, Beryl; Apperley, Mark (British HCI Group, 2003)
    This demonstration shows the tool we have developed for hand-sketching user interfaces. Our motivation for developing this tool is to provide an environment where novice programmers can move freely along the design continuum ...
  • Lower bounds on the sizes of defining sets in full n-Latin squares and full designs

    Cavenagh, Nicholas J. (Springer Japan KK, 2018)
    The full n-Latin square is the n×n array with symbols 1, 2, . . . , n in each cell. In this paper we show, as part of a more general result,that any defining set for the full n-Latin square has size n³(1 − o(1)). The full ...
  • Constructing (0,1)-matrices with large minimal defining sets

    Cavenagh, Nicholas J.; Ramadurai, Reshma (Elsevier, 2018)
    If D is a partially filled-in (0, 1)-matrix with a unique completion to a (0, 1)-matrix M (with prescribed row and column sums), we say that D is a defining set for M. Let A₂ₘ,ₘbe the set of (0, 1)-matrices of dimensions ...
  • On the distances between Latin squares and the smallest defining set size

    Cavenagh, Nicholas J.; Ramadurai, Reshma (Elsevier, 2016)
    We show that for each Latin square L of order n ≥ 2 , there exists a Latin square L’ ≠ L of order n such that L and L’ differ in at most 8√n̅ cells. Equivalently, each Latin square of order n contains a Latin trade of ...
  • Balanced diagonals in frequency squares

    Cavenagh, Nicholas J.; Mammoliti, Adam (Elsevier, 2018)
    We say that a diagonal in an array is λ-balanced if each entry occurs λ times. Let L be a frequency square of type F (n; λ); that is, an n ✕ n array in which each entry from {1, 2, …, m=n / λ } occurs λ times per row and ...

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