In this paper, we study partial visibility (or p-visibility) of a scene containing semi-transparent (convex) obstacles through which the light can pass partly. We define the p-visibility polygon and give algorithms to compute it for any query point...

We study a new class of visibility problems based on the notion of α-visibility. Given an angle α and a collection of line segments S in the plane, a segment t is said to be α-visible from a point p, if there exists an empty triangle with one vertex...

We study a new class of visibility problems based on the notion of α-visibility. Given an angle α and a collection of line segments S in the plane, a segment t is said to be α-visible from a point p, if there exists an empty triangle with one vertex...

Recently, there have been many reports on the late transition metal complexes as catalysts for olefin homo- and copolymerization [1-3]. Bao et al. [4] have been investigated on a series of copper (II) complexes of β-ketoamine ...

Government initiatives are currently popular in many countries, both developed and developing countries. Iran is an Islamic country and one of the most ancient and richest bureaucratic systems in the world. Thus, the nature ...