We consider gauge invariant quark two-point Green’s functions in which the gluonic phase factor follows a skew-polygonal line. Using a particular representation for the quark propagator in the presence of an external gluon field, functional relations between Green’s functions with different numbers of segments of the polygonal lines are established. An integral equation is obtained for the Gree...

HUBEL and WIESEL (1962) described neurons in the mammalian visual system which respond most ~gorou~y to a contour moving through the visual field in a particnlar direction. With repeated stimulation, the response of such cells diminishes (BARLOW and HILL, 1963; HUBEL and WIESEL, 1965). Adaptation produced by prolonged viewing of uniformly moving contours has also been studied psychophysically w...

Active contours (also known as snakes) have shown their ability to introduce regularity on image segmentation. In contrast with level-set approaches, the active techniques based a contour parameterization are able maintain initial topology of area interest. For this reason, it has been used in recent medical research for diaphragm Most on-line codes 2D/3D segmentation, well built-in Matlab tool...

Dendritic cells (DC) acquire antigens in peripheral tissues, transport them to lymph nodes and present peptides to T cells. DC are particularly good activators of resting T cells. Murine Langerhans' cells (LC) are efficient at endocytosing and processing antigens but are very weak immunostimulators. In culture LC lose the ability to process antigen and become potent immunostimulators. Other per...

We propose an approach to texture boundary detection that only requires a line-search in the direction normal to the edge. It is therefore very fast and can be incorporated into a real-time 3–D pose estimation algorithm that retains the speed of those that rely solely on gradient properties along object contours but does not fail in the presence of highly textured object and clutter. This is ac...

Experiments on accent type recognition and syntactic boundary detection of Japanese speech were conducted based on the statistical modeling of voice fundamental frequency contours formerly proposed by the authors. In the proposed modeling, fundamental frequency contours are segmented into moraic units to generate moraic contours, which are further represented by discrete codes. After modeling t...

Line drawings produced by contours traced on a surface can produce a vivid impression of the surface shape. The stability of this perception is notable considering that the information provided by the surface contours is quite ambiguous. We have studied the stability of line drawing perception from psychophysical and computational standpoints. For a given family of simple line drawings, human o...

This article investigates whether it is economically feasible for a large publishing house to waive processing charges the group of 47 so-called least developed countries (LDC). As an example, Springer Nature selected. The analysis based on Web Science, OpenAPC and Jisc Collections’ Compact journal list. result, estimates average yearly publication output 520 publications (or 0.26% worldwide in...

There is a striking correlation between terrestrial species' pupil shape and ecological niche (that is, foraging mode and time of day they are active). Species with vertically elongated pupils are very likely to be ambush predators and active day and night. Species with horizontally elongated pupils are very likely to be prey and to have laterally placed eyes. Vertically elongated pupils create...