Binary descriptors of image patches provide processing speed advantages and require less storage than methods that encode the patch appearance with a vector of real numbers. We provide evidence that, despite its simplicity, a stochastic hill climbing descriptor construction process defeats recently proposed alternatives on a standard discriminative power benchmark. The method is easy to impleme...

We derive necessary and sufficient conditions for a one-dimensional periodic Schrödinger (i.e., Hill) operator H = −d 2 /dx 2 + V in L 2 (R) to be a spectral operator of scalar type. The conditions demonstrate the remarkable fact that the property of a Hill operator being a spectral operator is independent of smoothness (or even analyticity) properties of the potential V. R ´ ESUMÉ. Quand un op...

The evolution of integumentary colouration in animals, and particularly its relationships with parasite-mediated sexual selection, is a controversial issue that has attracted the interest of numerous researchers (e.g. Hill, 1991; Houde & Torio, 1992; Andersson, 1994; Lozano, 1994; Badyev & Hill, 2000). Most studies concern birds, which exhibit an enormous array of colours and patterns unparalle...

1. Li, W. H., and S. H. Lam, Principles of Fluid Mechanics. Reading, MA: Addison-Wesley, 1964. 2. Daily, J. W., and D. R. F. Harleman, Fluid Dynamics. Reading, MA: Addison-Wesley, 1966. 3. Schlichting, H., Boundary-Layer Theory, 7th ed. New York: McGraw-Hill, 1979. 4. White, F. M., Viscous Fluid Flow, 3rd ed. New York: McGraw-Hill, 2000. 5. Sabersky, R. H., A. J. Acosta, E. G. Hauptmann, and E....

If one applies the Hill, Pickands or Dekkers-Einmahl-de Haan estimators of the tail index of a distribution to data which are rounded off one often observes that these estimators oscillate strongly as a function of the number k of order statistics involved. We study this phenomenon in the case of a Pareto distribution. We provide formulas for the expected value and variance of the Hill estimato...

A mathematical model is presented describing the timeand length-dependent behavior of cardiac muscle. The model describes a wider variety of experimental data than do previously published models. It incorporates a modification of the Hill equation describing the force-velocity relation. Based on the sliding filament theory, the revised equation includes the effects of finite cross-bridge compli...

BACKGROUND EMG-to-force estimation based on muscle models, for voluntary contraction has many applications in human motion analysis. The so-called Hill model is recognized as a standard model for this practical use. However, it is a phenomenological model whereby muscle activation, force-length and force-velocity properties are considered independently. Perreault reported Hill modeling errors w...

OBJECTIVES A recent editorial in Medicine and Science in Sports and Exercise concludes that the study of Hawkins and colleagues confirms "beyond any doubt the proposition of Hill and Lupton". It is not clear which of Hill and Lupton's propositions have been proved "beyond any doubt". METHODS A review of all the relevant publications of A V Hill and his colleagues. RESULTS Hill and Lupton be...

Quantifying and assessing changes in biological diversity are central aspects of many ecological studies, yet accurate methods of estimating biological diversity from sampling data have been elusive. Hill numbers, or the effective number of species, are increasingly used to characterize the taxonomic, phylogenetic, or functional diversity of an assemblage. However, empirical estimates of Hill n...

Pamela Oliver received her B.A. in sociology from Stanford University and her M.A. from the University of North Carolina, Chapel Hill, in 1972. She is currently working on her Ph.D. at North Carolina. Her major interest is developing exchange theory so that it can apply to inter-group relations, focusing on unbalanced power relations. She is also interested in evolutionary theory, family sociol...