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In this chapter, we present a GPU-based implementation of a photon transport model that is particularly effective in global illumination of participating media, including atmospheric geometry such as clouds, smoke, and haze, as well as densely placed, translucent surfaces. The model provides the "perfect" GPU application in the sense that the kernel code can be structured to minimize control flow divergence and yet avoid all memory bank conflicts and uncoalesced accesses to global memory. Thus the speedups over single-core CPU execution are dramatic. Example applications include clouds, plants, and plastics.

Abstract-The term WiMAX is used to refer to a collection of standards, products, and service offerings derived from the IEEE 802.16 family of standards for metropolitan area wireless networks. A significant body of published research in the WiMAX domain exists, but the focus of much of it is on the use of analytic or simulation models to evaluate aspects of physical layer protocols, medium access control protocols, or proposed scheduling algorithms. It this paper we describe performance characteristics of an operational WiMAX testbed upon which we were able to conduct controlled experiments in the absence of competing traffic. We characterize latency, throughput, protocol overhead, packet loss, and the impact of WiMAX on TCP dynamics.

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