378 research outputs found
Tasmania, 2009
No full textMap of Tasmania showing vineyards, cellar doors, breweries, distilleries and gastronomic produce locations. Relief shown by shading.; Includes descriptions of wine regions, grape varieties and wines, climatic maps and production statistics, wine history since 1823, and ill. on verso.; Index to food on recto. Index to cellar doors, vineyards, fruit wineries, breweries and distilleries on verso; Insets Lower Tamar Valley vineyards. Scale 1:200,000 -- Huon Valley & D'Entrecasteaux Channel Vineyards. Scale 1:250,000 -- Coal River Valley vineyards. Scale 1:200,000Color1:500,00
Non-Orthogonal View Iris Recognition System
No full text[[abstract]]This paper proposes a non-orthogonal view iris recognition system comprising a new iris imaging module, an iris segmentation module, an iris feature extraction module and a classification module. A dual-charge-coupled device camera was developed to capture four-spectral (red, green, blue, and near-infrared) iris images which contain useful information for simplifying the iris segmentation task. An intelligent random sample consensus iris segmentation method is proposed to robustly detect iris boundaries in a four-spectral iris image. In order to match iris images acquired at different off-axis angles, we propose a circle rectification method to reduce the off-axis iris distortion. The rectification parameters are estimated using the detected elliptical pupillary boundary. Furthermore, we propose a novel iris descriptor which characterizes an iris pattern with multiscale step/ridge edge-type maps. The edge-type maps are extracted with the derivative of Gaussian and the Laplacian of Gaussian filters. The iris pattern classification is accomplished by edge-type matching which can be understood intuitively with the concept of classifier ensembles. Experimental results show that the equal error rate of our approach is only 0.04% when recognizing iris images acquired at different off-axis angles within +/- 30 degrees.[[note]]SC
Using the Google Maps to display the pattern of co-author collaborations in JMIR since 1999: A bibliometric study (Preprint)
No full text
BACKGROUND
The Google Maps have become increasingly attractive and the disease outbreak has been especially drawn on the Google Maps because of its easy-use characteristic to serve as a spatial representation with coordinates. The use of Google Maps in bibliometric studies is of particular interest in recent years due to the trend of the science evolution that can be known via the visual representations or a dashboard.
OBJECTIVE
The aim is to conduct a systematic evaluation of the literature on the feasibility and applicability of using Google Maps in bibliometrics and to assess the potential benefits and limitations of its application on the topic of co-author collaborations for an academic journal.
METHODS
The literature was searched for articles published in the Journal of Medical Internet Research (JMIR) since 1999. A total of 2,289 original research articles were extracted from the Medline library. The clusters of author nationalities, the productive authors, and the medical subject headings (MESH) terms were analyzed and distributed on the Google Maps. One-parameter Rasch model of continuous items was performed through cloud computation to examine the aberrant responses of count frequency in paper publications. We applied social network analysis (SNA), the Gini coefficient (GC) and the cluster coefficient(CC) to report study results with visual representations: (i) the trend of author collaboration in JMIR; (ii) the dominant nations and productive authors in JMIR; and (iii) the MESH terms to display the evolution of the journal features.
RESULTS
The trend of author collaboration in JMIR is increasing (=0.77) based on the number of authors per article. The mean number of individuals listed as authors in articles is 5.4. The most number of the 1st authors are from the U.S.( 819, 35.78 %), the European Netherlands (225, 9.83%), and the U.K. (199, 8.69%). The top two MESH terms are methods (1,141, 22.39%) and internet (844, 16.56%). The most productive author is Christensen, Helen (Australia) who published 27 articles in JMIR and had a significant network density (CC=0.45, t=7.14). The number of paper publications in nations has a close relation (=0.83) with the national GDP in 2016.
CONCLUSIONS
There are promising feasibility and applicability of using Google Maps to serve as a spatial representation in bibliometrics or the disease outbreaks in the future. The social network analysis incorporated with the Google Maps provides wide and deep insights into the relationships among entities. The results can provide readers a concept map with the knowledge on the internet to know the JMIR characteristics.
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Counting non-isomorphic three-connected planar maps
No full textAbstractA counting formula for the number of non-isomorphic planar maps with m edges was obtained by V. A. Liskovets, and non-isomorphic 2-connected planar maps were counted by Liskovets and the author. R. W. Robinson's generalization of Polya's counting theory can be applied to these formulae to count, in polynomial time, non-isomorphic planar maps satisfying various sets of restrictions. Here two sets of planar maps are counted: maps with given 2-connected components, and 3-connected maps
Rapid fluctuations of chaotic maps on RN
No full textThis is an open access article under the CC BY license.The iterates fn of a chaotic map f display heightened oscillations (or fluctuations) as n → ∞. If f is a chaotic interval map in one dimension, then it is now known that the total variation of fn on that interval grows exponentially with respect to n [G. Chen, T. Huang, Y. Huang, Chaotic behavior of interval maps and total variations of iterates, Internat. J. Bifur. Chaos 14 (2004) 2161-2186]. However, the characterization of chaotic behavior of maps in multi-dimensional spaces is generally much more challenging. Here, we generalize the definition of bounded variations for vector-valued maps in terms of the Hausdorff measure and then use it to study what we call rapid fluctuations on fractal sets in multi-dimensional chaotic discrete dynamical systems. The relations among rapid fluctuations, strict turbulence and positive entropy are established for Lipschitz continuous systems on general N-dimensional Euclidean spaces. Applications to planar monotone or competitive systems, and triangular systems on the square are also given. © 2005 Elsevier Inc. All rights reserved.Advanced Academic Research Center of Zhongshan University; TITF; Texas A and M University, TAMU; Natural Science Foundation of Guangdong Province* Corresponding author. E-mail addresses: [email protected] (Y. Huang), [email protected] (G. Chen), [email protected] (D. Ma). 1 Supported in part by Natural Science Foundation of Guangdong Province, PR China and the Advanced Academic Research Center of Zhongshan University. 2 Supported in part by TITF initiative grant from Texas A&M University
Analysis on Wiener spaces. I. Nonlinear maps
No full textAbstractThe author introduces several kinds of capacities and regularity of nonlinear maps on Wiener spaces, and studies their properties
Deciding the point-to-fixed-point problem for skew tent maps on an interval
No full textWe consider a family of skew tent maps f(a) on the unit interval, determined by the parameter a, with 0 < a < 1. We give a decision procedure, that on input a and a point x(0) in the unit interval, determines whether or not the sequence x(0), f(a)(x(0)), f(a)(2)(x(0)), ... of iterates of f(a) on x(0) reaches one of the two fixed points of f(a) after a finite number of iterations. (C) 2020 Elsevier Inc. All rights reserved.Kuijpers, B (corresponding author), Hasselt Univ, Databases & Theoret Comp Sci Grp, Hasselt, Belgium ; Hasselt Univ, Data Sci Inst, Hasselt, Belgium.
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Counting unicellular maps on non-orientable surfaces
No full textAbstractA unicellular map is the embedding of a connected graph in a surface in such a way that the complement of the graph is a topological disk. In this paper we present a bijective link between unicellular maps on a non-orientable surface and unicellular maps of a lower topological type, with distinguished vertices. From that we obtain a recurrence equation that leads to (new) explicit counting formulas for non-orientable unicellular maps of fixed topology. In particular, we give exact formulas for the precubic case (all vertices of degree 1 or 3), and asymptotic formulas for the general case, when the number of edges goes to infinity. Our strategy is inspired by recent results obtained by the second author for the orientable case, but significant novelties are introduced: in particular we construct an involution which, in some sense, “averages” the effects of non-orientability
A product formula for the degree of A-proper maps
No full textAbstractBrowder and Petryshyn (Bull. Amer. Math. Soc., 74 (1968), 641–646) defined a notion of degree for the class of A-proper maps, which definition was refined by the author. This definition generalised the well-known Leray-Schauder degree for maps of the type Identity + Compact. Here we show, that the product formula (relating the degree of a composition of maps to the degree of each of the maps) is still valid if one of the maps is of the form Identity + Compact. This formula allows us to compare the above degree with the definition given by Elworthy and Tromba for differentiable Fredholm maps on open subsets of Banach spaces. It also gives an improved version of Theorem 2 of Browder and Petryshyn
Almost split morphisms, preprojective algebras and multiplication maps of maximal rank
No full textAbstractWith a grading previously introduced by the second-named author, the multiplication maps in the preprojective algebra satisfy a maximal rank property that is similar to the maximal rank property proven by Hochster and Laksov for the multiplication maps in the commutative polynomial ring. The result follows from a more general theorem about the maximal rank property of a minimal almost split morphism, which also yields a quadratic inequality for the dimensions of indecomposable modules involved
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