for a graph g, let d(g) be the set of all strong orientations of g. the orientationnumber of g is min {d(d) |d belongs to d(g)}, where d(d) denotes the diameterof the digraph d. in this paper, we determine the orientation number for some subgraphs of complete bipartite graphs.

Given a graph $G$, its orientation covering number $\sigma(G)$ is the smallest non-negative integer $k$ with property that we can choose orientations of $G$ such whenever $x, y, z$ are vertices $xy,xz\in E(G)$ then there chosen in which both $xy$ and $xz$ oriented away from $x$. Esperet, Gimbel King showed $\sigma(G)\leq \sigma\left(K_{\chi(G)}\right)$, where $\chi(G)$ chromatic asked whether a...

the aim of this study is investigation of the effect of customer orientation on strategic innovation in nikan hospital, which considered as an applied research and the research methodology as descriptive and based on survey. the population consisted of hospital managers and customers of nikan hospital; customers were unlimited and managers population consisted of 20 person and the number of man...

Human texture vision has been modeled as a filter-rectify-filter (FRF) process, in which '2nd-order' filters detect changes in the rectified outputs of luminance-based '1st-order' filters. This study tested the validity of the two basic assumptions of the standard FRF model, namely (a) that the 2nd-order filters are sensitive to spatial modulations in both contrast and orientation, and (b) that...

Humans can easily segregate texture regions based on differences in contrast, orientation, and contrast polarity. It has been suggested that these abilities can be inclusively modeled by 2nd-order visual mechanisms that detect changes in the half-wave rectified outputs of orientation-selective filters. Using a subthreshold-summation paradigm, however, we show that modulations of contrast polari...

Several statistical image properties have been associated with large subsets of traditional visual artworks. Here, we investigate some of these properties in three categories of art that differ in artistic claim and prestige: (1) Traditional art of different cultural origin from established museums and art collections (oil paintings and graphic art of Western provenance, Islamic book illustrati...

Two experiments are reported in which Ss were required to determine whether a random, angular form, presented at any of a number of picture-plane orientations, was a “standard” or “reflected” version. Average time required to make this determination increased linearly with the angular departure of the form from a previously learned orientation. The slope and intercept of the reaction-time (RT) ...

Graph orientation is a well-studied area of graph theory. A proper orientation of a graph G = (V,E) is an orientationD of E(G) such that for every two adjacent vertices v and u, d D (v) 6= d D (u) where d D (v) is the number of edges with head v in D. The proper orientation number of G is defined as −→χ (G) = min D∈Γ max v∈V (G) d D (v) where Γ is the set of proper orientations of G. We have χ(...