Аbstract—This article describes the technologies of parallel processing of ray tracing using central processing unit (CPU) and graphics processing unit (GPU). The one problem of parallel processing of ray tracing is imbalance among the pixels computation which leads to performance degradation. A serious disadvantage of ray tracing is performance. Other algorithms use data coherence to share com...

This chapter addresses the key issues of chemical plume mapping and tracing via swarm robots. First, the authors present the models of turbulent odor plumes with both non-buoyant and buoyant features, which can efficiently evaluate strategies for tracing plumes, identifying their sources in two or threedimensions. Second, the authors use the Monte Carlo technique to optimize moth-inspired plume...

The moth-inspired plume-tracing strategies on a single REMUS underwater vehicle successfully tracked a Rhodamine dye plume over 100 m and declared its source location in near-shore ocean environments that are characterized by turbulence, tides, and waves. This paper expands moth-inspired plume tracing via a single vehicle to multiple vehicles. The new strategy includes a mechanism determining a...

This article introduces a qualitative research method called discourse tracing. Discourse tracing draws from contributions made by ethnographers, discourse critics, case study scholars, and process tracers. The approach offers new insights and an attendant language about how we engage in research designed specifically for the critical-interpretive and applied analysis of discourse. More specifi...

An outbreak of Ebola virus disease occurred in Nigeria between July and September 2014. Contact tracing commenced in Lagos, and extended to Port Harcourt and Enugu as the outbreak continued to spread. A total of 899 contacts were traced. Contact tracing enhanced immediate identification of symptomatic contacts, some of whom eventually became cases. Contact tracing could be challenging in urban ...

For realistic image synthesis and many other simulation applications, ray tracing is the only choice to achieve the desired realism and accuracy. Ray tracing has become such an important algorithm that an implementation in hardware is justified and desirable. The first ray tracing hardware realizations have been using floating point and logarithmic arithmetic. While floating point arithmetic re...

A prospective study of 6825 labours was undertaken to determine the relation between the Apgar scores of the babies at one minute and the cardiotocograph tracing in labour. The sensitivity of an abnormal tracing was 35.2% for babies who needed intermittent positive pressure ventilation and 20.0% for babies who did not but who had Apgar scores of less than 7. The sensitivity of an abnormal traci...

Ray tracing has become a very popular method for image synthesis due to its un paralleled exibility and its ability the generate images of high quality and realism Simulation of e ects such as re ection and refraction have been the hallmarks of ray tracing since its introduction With the advent of stochastic ray tracing the range of e ects expanded to include motion blur soft shadows depth of e...

Ray tracing is a fundamental process in many areas including computer graphics and medical applications. Different hierarchical acceleration structures for ray tracing have been developed. Such ray tracing approaches executed on advanced many-core processors such as GPU, however, turns out to be memory bounded due to their frequent search operations in the hierarchical structures. This paper pr...

Consider optical systems consisting of a set of refractive or reflective surfaces. The ray tracing problem is, given an optical system and the position and direction of an initial light ray, to decide if a light ray reaches some given final position. We assume the position and the tangent of the incident angle of the initial light ray is rational. For many years, ray tracing has been used for d...