In a recent update of the Dutch contingency plan for controlling outbreaks of classical swine fever (CSF), emergency vaccination is preferred to large-scale pre-emptive culling. This policy change raised two questions: can emergency vaccination be as effective as pre-emptive culling, and what are the implications for showing freedom of infection? Here, we integrate quantitative information avai...

There are potentially many situations in which creatures will be subject to infrequent but regular culling. In terms of controlling crop pests, some farmers may only be able to afford to apply pesticides occasionally. Alternatively, pesticides may be applied only occasionally to limit their unwelcome side effects, which include pesticide resistance, chemical poisoning of agricultural workers, a...

We present a new parallel occlusion culling algorithm for interactive display of large environments. It uses a cluster of three graphics processing units (GPUs) to compute an occlusion representation, cull away occluded objects and render the visible primitives. Moreover, our parallel architecture reverses the role of two of the GPUs between successive frames to lower the communication overhead...

We present a sub linear algorithm for computing and culling back facing polygons that yields a signi cant performance improvement in the interactive rendering of large polygonal models The algorithm partitions a polygonal model it into hierarchical clusters based on the normals and positions of the polygons It does not explicitly compute all the back facing polygons but rather decides in expect...

Large, complex 3D scenes are best rendered in an output-sensitive way, i.e., in time largely independent of the entire scene model’s complexity. Occlusion culling is one of the key techniques for output-sensitive rendering. We generalize existing occlusion culling algorithms, intended for static scenes, to handle dynamic scenes having numerous moving objects. The data structure used by an occlu...

In the epidemiological literature, the eradication of a wildlife disease through culling is usually described in terms of a constant hunting rate to simulate the selective removal of animals from the population. By using simple SI (susceptible–infected) models, it is easy to prove that, if the hunting rate is high enough, the population eventually drops below a critical threshold level under wh...

Records of Angus, Hereford, Shorthorn, and first-cross cows born from 1960 to 1963 were used to study the effect of age at first calving and culling policy on cumulative survival (SU), number of breeding seasons (BS), pregnancies (PG), calves born (CB) and alive at 72 h (C72) and at weaning (CW), calf weaning weights (WW), and input/output efficiency, up to 12 yr of age. The 155 cows born in 19...

This paper describes a technique to improve the rendering time of volumetric datasets using a volumetric skeleton. The skeleton is used to define a hierarchical set of bounding spheres which completely encapsulate the volume, enabling efficient space leaping during the ray casting and ray tracing processes. The spheres can also be used to cull portions of the dataset, i.e. by specifying logical...