the chromatic number of a graph g, denoted by χ(g), is the minimum number of colors such that g can be colored with these colors in such a way that no two adjacent vertices have the same color. a clique in a graph is a set of mutually adjacent vertices. the maximum size of a clique in a graph g is called the clique number of g. the turán graph tn(k) is a complete k-partite graph whose partition...

The objective of this paper is to evaluate a new combined approach intended for reliable color image segmentation, in particular images presenting color structures with strong but continuous color or luminosity changes, such as commonly found in outdoors scenes. The approach combines an enhanced version of the Gradient Network Method, GNM2, with common regiongrowing approaches used as pre-segme...

The distribution in color and absolute magnitude is presented for 55,158 galaxies taken from the Sloan Digital Sky Survey in the redshift range 0.08 < z < 0.12, as a function of galaxy number overdensity in a line-of-sight cylinder of transverse radius 1 h−1 Mpc. In all environments, bulge-dominated galaxies (defined to be those with radial profiles best fit with large Sérsic indices) form a na...

Quantification of erythema and/or pigmentation is important for in vivo assessment of skin reactions to external stimuli such as ultraviolet radiation. Measurement of lesional color is also useful for quantitative evaluation of the efficacy of therapies for skin lesions. Several types of portable optoelectronic instruments have recently become available for these purposes and have been applied ...

Objectives: To study the uterine artery resistance and pulsation indices during the mid luteal phase in patients with history of unexplained recurrent pregnancy loss and the effects of the nitric oxide donor isosorbid mononitrite on these indices. Study Design: A cross-section, controlled observational study. Setting: Benha University Hospital, Egypt. July 2009 to July 2010. Subjects and Method...

Integrated color indices corrected for galactic absorption, internal absorption, and redshift have been given for a large number of galaxies by de Vaucouleurs and de Vaucouleurs (1964). These indices may be compared with the maximum rotational velocities of galaxies that are listed in compilations by Brosche (1967, 1971). Such a comparison shows that there is a strong correlation between the in...

Satellite images are being used more and frequently in the analysis of land coverage, due to their ability record large areas land, managing analyze type coverage uses that it is providing, this work corresponding Amazon, where an attempt made evaluate through use Neural Networks, if chosen area covered by vegetation or does not present vegetation, carried out thanks calculation reflectance NDV...