Sameh Dakroury

• PhD
• Professor (Assistant) at Cairo University

We present a maintenance model for a multi-state semi-Markovian deteriorating system. Our model allows one of three maintenance decisions (do-nothing, minimal maintenance or replacement) to be taken at each state of the system. We use control limit policy and the policy-iteration algorithm to find the optimal maintenance policies that minimizes the...

Coupled Line Microstrip Bandpass Filters are considered as a promising candidate for bandpass filter for wireless and high frequency applications because of their small size, low cost and easy engineered fabrication. In this paper, a stochastic analysis of this coupled line bandpass filter which is based on Monte Carlo Model is developed, where the...

In this paper we introduced the proposed algorithm for computing the algebraic first integrals of chemical reactions, which convertible to a system of parametric ordinary differential equations. Generalization of the Bendixson-Dulac criterion for 2d-vector-fields to arbitrary dimensions is proved. Flowchart for this algorithm is given. Numerical re...

In this paper, the scene parameters are setup for scene reconstruction; camera position and orientation are considered. Consecutive images are used to create the depth map of the scene. After reconstructing the scene, we apply a new methodology to augment the scene by using LAB color space and K-means clustering. A general scheme for scene manipula...

A new technique for design centering of microwave circuits is introduced. This technique exploits the space-mapping interpolating surrogate (SMIS) with a modified ellipsoidal technique. The design centering solution for microwave circuits is obtained with a small number of fine model evaluations and, hence, the number of electromagnetic simulations...

We present a powerful optimization algorithm that incorporates space mapping (SM) and the new output space mapping (OSM) to yield highly optimized results in a handful of fine model evaluations. Our new method employs an SM-based interpolating surrogate (SMIS) framework that aims at matching the surrogate with the fine model locally. Accuracy and c...

We review the space-mapping (SM) technique and the SM-based surrogate (modeling) concept and their applications in engineering design optimization. For the first time, we present a mathematical motivation and place SM into the context of classical optimization. The aim of SM is to achieve a satisfactory solution with a minimal number of computation...

We review the space mapping (SM) technique and the SM-based surrogate (modeling) concept and their applications in engineering design optimization. The aim of SM is to achieve a satisfactory solution with a minimal number of computationally expensive "fine" model evaluations. SM procedures iteratively update and optimize surrogates based on a fast...

Simple illustration for trust region agressive space mapping