Immersive virtual world environments, such as Second Life (SL), have the potential to dramatically improve the process of analyzing usability within technically correct system simulations, long before the system is built. We report our findings with the SL simulation of a Personal Rapid Transit (PRT) system. The SL model and simulation were done according to the original technical specification...

Correcting for atmospheric e ects is an essential part of surface-re ectance recovery from radiance measurements. Model-based atmospheric correction techniques improve the accuracy of the identi cation and classi cation of terrestrial re ectances from multi-spectral imagery. Successful and e cient removal of atmospheric e ects from remote-sensing data is a key factor in the success of Earth obs...

OBJECTIVES The objective was to quantify the blue-light hazard from CO(2) arc welding of mild steel. METHODS The spectral radiance of arcs in CO(2) arc welding of mild steel was measured for solid and flux-cored wires at welding currents of 120-480 A. Effective blue-light radiance and the maximum acceptable exposure duration were calculated from the spectral radiance using their definitions i...

We present a new method for extracting the effective attenuation coefficient and the diffusion coefficient from relative spectrally resolved cw radiance measurements using the diffusion approximation. The method is validated on both simulated and experimental radiance data sets using Intralipid-1% as a test platform. The effective attenuation coefficient is determined from a simple algebraic ex...

In this paper we present a physical validation of global illumination algorithms based on measurements from a simple experimental setup. The validation methodology emphasises tractability and error minimisation. To this end, we discuss issues such as the acquisition and accurate simulation of material BRDFs and the light source distribution, as well as error analysis. In addition, we present a ...

Within two projects it is studied how the rapid radiative transfer model JURASSIC (Juelich Rapid Spectral Simulation Code) performs in cluster computing environments. We do so, having data analysis of future atmospheric satellite experiments in mind, which are likely to provide 10 – 100 times more measurement data than todays instruments. First studies presented here are based on radiance measu...

Global illumination within nondiffuse environments is ideally suited for computation under importance and radiance driven hierarchical refinement: a transport interaction is significant to the view from the eye only if it lies within paths of directional reflection of both radiance originating at a light source, and importance originating at the eye. We have recently developed a hierarchical al...

This paper describes a simulation study of traffic management opportunities with an extended Personal Rapid Transit (PRT) network at Heathrow airport. The investigation was based on the Citymobil reference scenario of the Heathrow airport PRT Demonstrator between Terminal 5 and a car park, but modified to allow investigation of a wider area including links to Terminal 1 to 3 and car parks. A pr...

This paper presents measurements of equilibrium radiation obtained from the NASA Ames Research Center’s EAST facility and the University of Queensland’s (UQ) X2 facility. Experiments have been conducted in both facilities aimed at measuring the level of radiation encountered during conditions relevant to the Orion lunar return into Earth’s atmosphere. The facilities have targeted the same nomin...