Described here are constructions of finite geometries, with special emphasis on generalized quadrangles, using first a strange subset <# of flags of a known finite geometry and then defining new objects by a process of sequentially taking collections of new flags in various residues according to certain rules. These rules can be thought of as a game played on a Dynkin diagram, and the diagram i...

The effect of shadowing on the early state of ultrarelativistic heavy ion collisions is investigated along with transverse energy and hard process production, specifically Drell-Yan, J/ψ, and Υ production. We choose several parton distributions and parameterizations of nuclear shadowing, as well as the spatial dependence of shadowing, to study the influence of shadowing on relevant observables....

Studies have suggested that there is farming potential in residential buildings. However, these studies are limited scope, require field visits and time-consuming measurements. Furthermore, they not ways to identify suitable sites on a larger scale let alone means of surveying numerous micro-locations across the same building. Using case study area focused high-rise buildings Singapore, this pa...

Michael Shub proved in 1969 that the topological conjugacy class of an expanding endomorphism on a compact manifold is determined by its homotopy type. In this article we generalize this result in two directions. In one direction we consider certain expanding maps on metric spaces. In a second direction we consider maps which are hyperbolic with respect to product cone fields on a product manif...

The interest in using higher frequency bands for high data rate wireless communication is increasing. Large unlicensed bandwidths are available specifically around 60 GHz. At this frequency, the propagation characteristics allow small cells and efficient frequency reuse. However, wireless communication at 60 GHz is mainly limited to Line-of-Sight (LOS), due to the high absorption loss of most m...

DISCLAIMER This document describes work undertaken as part of a programme of study at the Faculty of Geo-Information Science and Earth Observation of the University of Twente. All views and opinions expressed therein remain the sole responsibility of the author, and do not necessarily represent those of the Faculty. i ABSTRACT 2.5D building modelling is of great interest for visualization, simu...

Shadowing trajectories are one of the most powerful ideas of modern dynamical systems theory, providing a tool for proving some central theorems and a means to assess the relevance of models and numerically computed trajectories of chaotic systems. Shadowing has also been seen to have a role in state estimation and forecasting of nonlinear systems. Shadowing trajectories are guaranteed to exist...

This paper presents a physically plausible soft-shadow algorithm that can be executed real-time by current GPUs. The method works with a single shadow map, requires no preor post-processing, and can also handle self shadowing. The main novelty of the method is in the interpretation of the shadow map. A lexel with depth information is considered as the geometric definition of an elementary shado...

Rendering of realistic-looking hair is in general still too costly to do real-time applications, from simulating the physics rendering fine details required for it look natural, including self-shadowing. We show how an autoencoder network, that can be evaluated real time, trained filter image few stochastic samples, self-shadowing, produce a much more detailed takes into account thickness and t...

Flaminio Borgonovo, Michele Zorzi, Luigi Fratta Abstract—Recently, a new method for achieving spectrum reuse in cellular systems, called Capture-Division Packet Access (CDPA), has been introduced. The method uses a single frequency in all cells, and exploits packet switching and packet retransmission as a means to overcome destructive cochannel interference. As the CDPA key factor is packet ret...