Abdalla G. M. Ahmed

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OBJECTIVES To determine whether there is a relationship between the findings of routine postpartum ultrasonographic scanning and puerperal uterine complications such as heavy delayed postpartum hemorrhage, retained products of conception, and need for uterine curettage; and to estimate the value of both routine ultrasonographic scanning and clinical data in(More)
We describe a novel technique for the fast production of large point sets with different spectral properties. In contrast to tile-based methods we use so-called AA Patterns: ornamental point sets obtained from quantization errors. These patterns have a discrete and structured number-theoretic nature, can be produced at very low costs, and possess an(More)
A thorough comparison is made between the different implementation schemes of Space-Time and Space-Frequency Block Coded OFDM, showing the features of each alternative, and suggesting typical situations where it excels. New designs are also introduced to complete the comparison set. The issue of mixing diversity modes is addressed, too.
We describe a simple push-pull optimization (PPO) algorithm for blue-noise sampling by enforcing spatial constraints on given point sets. Constraints can be a minimum distance between samples, a maximum distance between an arbitrary point and the nearest sample, and a maximum deviation of a sample's capacity (area of Voronoi cell) from the mean capacity.(More)
We present a new idea for the algorithmic design of weaving patterns that is based on AA Outlines. The method takes advantage of their inherent property of having only a few distinct rows and columns. In contrast to a prior Bridges paper, we describe a new approach for extracting weaving patterns from AA Outlines, and we add colors of yarns as a design(More)
We explore the use of Truchet-like tiles (tiles with half area shaded) for single-tone (monochrome) line-based rendering of maps. We borrow concepts from information theory to develop some qualitative and quantitative measures, and use them to discuss four rendering styles which use Truchet-like tiles. We first present a style based on the original Truchet(More)