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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 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)
Writing this thesis work was a draining task. It has given me a new insight into how all of those stacks of theses found at The American University in Cairo library actually got there. Those theses represent not only the work of their authors, but also of all the reviewers and advisors who play a role in that long trail from thesis topic selection to its… (More)
We present a description of a rare but dangerous case of fungal meningitis caused by Aspergillus terreus in an immunocompetent patient with a history of sinus disease.
" AA Patterns " is the collective name of a recently introduced algorithmic art, where a simple affine 2D transformation is employed to generate aesthetic patterns. AA Patterns are controlled by a single real parameter between 1 and 2. This paper presents examples of how mathematical analysis can help in selecting and tuning the pattern parameter in such a… (More)
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)
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 present a new approach for stippling by recursively dividing a grayscale image into rectangles with equal amount of ink, then we use the resulting structure to generate novel line-based halftoning techniques. We present four different rendering styles which share the same underlying structure, two of which bear some similarity to Bosch-Kaplan's TSP Art… (More)