The reproductive value (see Fisher 1930) arises as part of the shadow price of the population in a large class of age-structured optimal control models. 1 Institute of Mathematical Methods in Economics (Research Unit on Operations Research and Control Systems), Vienna University of Technology, Argentinierst. 8, A-1040 Vienna, Austria. E-mail: [email protected]. ac.at and Vienna Institute of Dem...

This book is about the ways in which certain medieval literary texts use death, dying and the dead to think about problems relating to life – problems political, social, ethical, philosophical or existential. More specifically, it is about the dynamic interface between life and death and about figures caught at that interface, hence ‘living death’. There are ghosts and revenants who, although d...

The Search and Hyperlinking Task at MediaEval 2014 is the third edition of this task. As in previous versions, it consisted of two sub-tasks: (i) answering search queries from a collection of roughly 2700 hours of BBC broadcast TV material, and (ii) linking anchor segments from within the videos to other target segments within the video collection. For MediaEval 2014, both sub-tasks were based ...

Recent philosophical dissection of the scientific method can be caricatured as a polar debate between Karl Popper’s sober view of objective development and falsification of hypotheses and Thomas Kuhn’s more glamorous espousal of a role for ideology and subjectivity; ‘‘real science’’ as performed by the authors of this and other journals is probably a rich mix of the two. But while scientific id...

High-quality shadow anti-aliasing is a challenging problem in shadow mapping. Revectorization-based shadow mapping (RBSM) minimizes shadow aliasing by revectorizing the jagged shadow edges generated with shadow mapping, keeping low memory footprint and real-time performance for the shadow computation. However, the current implementation of RBSM is not so well optimized because its visibility fu...

Given the location of shadows, how can we obtain highquality shadow-free images? Several methods have been proposed so far, but they either introduce artifacts or can be difficult to implement. We propose here a simple method that results in virtually error and shadow-free images in a very short time. Our approach is based on the insight that shadow regions differ from their shadow-free counter...

In recent years , both Williams’ original Z-buffer shadow mapping algorithm [Williams 1978] and Crow’s shadow volumes [Crow 1977] have seen many variations, additions and enhancements, greatly increasing the visual quality and efficiency of renderings using these techniques. Additionally, the fast evolution of commodity graphics hardware allows for a nearly complete mapping of these algorithms ...

This paper describes a real-time shadow generation algorithm for polygonal environments illuminated by movable point light sources. The main goal is to quickly reduce the number of hidden shadow volumes, by using a technique of volumetric shadow rendering using stencil buffers with a modified BSP tree, i.e. a simplified version of a SVBSP (Shadow Volume BSP) tree. It also provides new easy-to-i...