This paper examines the relationship among disaster tolerant systems, Information Technology (IT) application operation and availability, and the executive level management visibility necessary for system operational success. The current state of disaster tolerant application systems is explored including an investigation into the reliability and survivability requirements necessary to achieve ...

We study the problem of visibility in polyhedral terrains in the presence of multiple viewpoints. We consider three fundamental visibility structures: the visibility map, the colored visibility map, and the Voronoi visibility map. We study the complexity of each structure for both 1.5D and 2.5D terrains, and provide efficient algorithms to construct them. Our algorithm for the visibility map in...

This paper presents a new approach to visibility culling. We propose a conservative visibility preprocessing method for complex virtual environments. The proposed method deals with general 3D graphical models and invisible polygons jointly blocked by multiple occluders. The proposed method decomposes volume visibility from the predefined volume into the area visibility from rectangles surroundi...

We report the first stage of a project aimed at computing visibility scripts for active inspection applications, in which a robot-mounted sensor observes a known object from different viewpoints. Visibility scripts describe the optimal sensor position for a given inspection task and may involve different visibility requirements, e.g. achieving optimal visibility of a single object feature or si...

The Southwest has beautiful desert landscapes, forested mountains, and a rapidly growing population. People expect clean air and unrestricted vistas. They complain when their visibility is reduced. Visibility reduction is caused by pollution transported into the region from the large urban complex of Los Angeles as well as from the growing metropolitan area within the region. People are general...

Die selbständige und eigenhändige Anfertigung versichere ich an Eides statt. Conclusion 71 Bibliography 75 Introduction " The true mystery of the world is the visible, not the invisible. " Oscar Wilde How can geometric settings be encoded combinatorially? Which discrete structures extract the essential information from continuous arrangements? How can the combinatorial properties of visibility ...

Visibility computations are central in any computer graphics application. The most common way to reduce this expense is the use of approximate approaches using spatial subdivision. More recently analytic approaches efficiently encoding visibility have appeared for 2D (the visibility complex) and for certain limited cases in 3D (aspect graph, discontinuity meshes). In this paper we propose a new...

We present an online occlusion culling system which computes visibility in parallel to the rendering pipeline. We show how to use point visibility algorithms to quickly calculate a tight potentially visible set (PVS ) which is valid for several frames, by shrinking the occluders used in visibility calculations by an adequate amount. These visibility calculations can be performed on a visibility...

This paper examines how organizations perceive affordances of social media and how they react to their employees’ use of social media through policies, a key means of organizational governance. Existing literature identified 4 affordances visibility, persistence, editability, and association (between people and between people and information) as action potentials of social media in organization...