Mohamed Shalaby

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We present techniques for creating an approximate implicit representation of space curves and of surfaces of revolution. In both cases, the proposed techniques reduce the problem to that of implicitization of planar curves. For space curves, which are described as the intersection of two implicitly defined surfaces, we show how to generate an approximately(More)
We report on approximate techniques for conversion between the implicit and the parametric representation of curves and surfaces, i.e., implicitization and parameterization. It is shown that these techniques are able to handle general free-form surfaces, and they can therefore be used to exploit the duality of implicit and parametric representations. In(More)
1 Institute of Applied Geometry, Johannes Kepler University, Altenberger Str. 69, 4040 Linz, Austria; www.ag.jku.at, Email: firstname.lastname@jku.at 2 SINTEF ICT, P.O. Box 124 Blindern, N–O314 Oslo, Norway; www.math.sintef.no, Email: [Jan.B.Thomassen|Tor.Dokken]@sintef.no 3 Center of Mathematics for Applications, P.O.Box 1053 Blindern, N–0316 Oslo, Norway;(More)
We present a new method for constructing a low degree <i>C</i><sup>1</sup> implicit spline representation of a given parametric planar curve. To ensure the low degree condition, quadratic B-splines are used to approximate the given curve via orthogonal projection in Sobolev spaces. Adaptive knot removal, which is based on spline wavelets, is used to reduce(More)
Cognitive radio is an emerging technology, which aims to upgrade the spectrum utilization by allowing the secondary users to operate at the spectrum bands vacated by the primary users. A cognitive radio system model was simulated and the performance of the energy detector was evaluated by using different wireless channel models. These models include(More)
This paper is presenting an idea of applying the Scrum framework in the IT service support domain. Scrum framework is mainly used with conjunction of other agile methods in software development domain, but almost, no reporting for its usage in the support of that software, except in few cases. Scrum framework can be applied at small, medium, and as well as(More)
AIM To study the possible interactions of metoclopramide, domperidone and erythromycin in streptozotocin-induced diabetic mice treated with insulin by various parameters. METHODS Effects of the individual as well as combined drugs were studied in diabetic mice via estimation of the blood glucose and serum insulin levels, small intestinal transit (SIT),(More)
Objective: This study evaluated the possible protective effect of valenoic acid dilactone on fludrocortisones induced hypertension in Wister rats. Methodology: Fludrocortisones induced reabsorption of salt and water leading to increase in blood volume and hence, increase blood pressure. There is also increased secretion of vasopressin in addition, altered(More)