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Search Results: 1 - 10 of 2468 matches for " Mahmoud Daoud "
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POPQ system and dynamic MRI in assessment of female genital prolapse  [PDF]
Mohamed N. El-Gharib, Manal A. Farahat, Mahmoud Daoud
Open Journal of Obstetrics and Gynecology (OJOG) , 2013, DOI: 10.4236/ojog.2013.32045
Abstract:

Aim: To assess the role of Magnetic resonance imaging (MRI) and pelvic organ prolapse quantification (POPQ) system in the evaluation of female pelvic organ prolapse. Design: Prospective study. Setting: TantaUniversityHospital. Patients: The study was carried out on 60 patients having clinical manifestations suggesting pelvic floor weakness. Intervention: All the patients were subjected to history taking, physical examination including POPQ, and pelvic MRI (static and dynamic) examination. Outcome measures: Quantitative measurements of genital prolapse. Results: All patients showed loss of the normal position of the perineal plate indicating generalized weakness of the whole pelvic floor muscles. Dynamic MRI exhibited pelvic floor abnormalities in 46 patients who did not show any abnormalities on the static images. Conclusion: Dynamic MRI is a helpful tool in defining the nature and quantitative measurements of pelvic organ prolapse. Also, MRI has and advantage over POPQ system in diagnosing lateral prolapse.

Hard Decision-Based PWM for MIMO-OFDM Radar  [PDF]
Omar Daoud
Communications and Network (CN) , 2015, DOI: 10.4236/cn.2015.71004
Abstract: For the purpose of target localization, Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) radar has been proposed. OFDM technique has been adopted in order to a simultaneous transmission and reception of a set of multiple narrowband orthogonal signals at orthogonal frequencies. Although multi-carrier systems such as OFDM support high data rate applications, they do not only require linear amplification but also they complicate the power amplifiers design and increase power consumption. This is because of high peak-to-average power ratio (PAPR). In this work, a new proposition has been made based on the Pulse Width Modulation (PWM) to enhance the MIMO-OFDM radar systems’ performance. In order to check the proposed systems performance and its validity, a numerical analysis and a MATLAB simulation have been conducted. Nevertheless of the system characteristics and under same bandwidth occupancy and system’s specifications, the simulation results show that this work can reduce the PAPR values clearly and show capable results over the ones in the literature.
Neural network assessment of herbal protection against chemotherapeutic-induced reproductive toxicity
Amr Amin, Doaa Mahmoud-Ghoneim, Muhammed I Syam, Sayel Daoud
Theoretical Biology and Medical Modelling , 2012, DOI: 10.1186/1742-4682-9-1
Abstract: Cis-diamminedichloroplatinum (II) or cisplatin (CIS) is a highly effective anti-neoplastic DNA alkylating agent used to treat many types of solid tumors including testicular, ovarian, breast, lung, bladder, and head and neck. However, adverse side-effects, including testicular toxicity, limit its application [1,2]. Both short-term and long-term effects of CIS treatment on testicular function have been previously documented in human [2] and in other animal models [3,4]. Within days of CIS injection, animals develop severe testicular damage characterized by germ cell apoptosis, Leydig cell dysfunction and testicular steroidogenic disorder [4-7]. Germ cell apoptosis has been reported to play an important role in CIS-induced testicular damage [4-7]. CIS-induced DNA adduct formation in rat's spermatozoa was observed after treatment with CIS at a dose of 10 mg/kg body weight [8].Free radicals have been reported to mediate reactions responsible for a wide range of CIS-induced side-effects. Consequently, anti-oxidants have been shown to protect non-malignant cells and organs against damage by CIS [8]. CIS has previously been shown to induce lipid peroxidation (LP) with a concomitant decrease in the level of testicular anti-oxidants [6].Ginkgo Biloba (GB) has been used in traditional Chinese medicine for about 5000 years. It is one of the herbal drugs that has been widely used due to its antioxidant properties, ability to modify vasomotor function, effect on ion channels to inhibit activation of platelets and smooth muscle cells [9,10], stimulate neurotransmitters [11], decrease adhesion of blood cells to endothelium, and to modify signal transduction [9]. GB has also been used in the treatment of Alzheimer's disease and cognitive impairment. The major bioactive components of GB are flavonoglycosides and terpene lactones. GB extract was also reported for many decades to increase peripheral and cerebral blood flow as well as for the treatment of dementia. Furthermore, GB leav
PERFORMANCE INVESTIGATIONS OF SOME ACTIVE QUEUE MANAGEMENT TECHNIQUES USING SIMULATION
Hussein Abdel-jaber,Fadi Thabtah,Amjad M Daoud,Jafar Ababneh,Mahmoud Baklizi
International Journal of New Computer Architectures and their Applications , 2012,
Abstract: Congestion is a fundamental problem in computer networks. Congestion may occur at router buffers of networks when the number of incoming packets cannot be absorbed by the available network resources such as buffer spaces. A poor network performance can be offered due to congestion, e.g. high dropping and queueing delay for packets, low throughput and unmaintained average queue length which may not prevent the router buffers from building up, then dropping packets. Different Active Queue Management (AQM) methods have been proposed to deal with congestion such as Random Early Detection (RED) and its variants like, Gentle Random Early Detection (GRED), REDD1 (the FLC method based on RED), etc. This paper presents a comparison between three AQM methods, i.e. GRED, REDD1 and the Adaptive GRED regarding to several performance measures such as: mean queue length (mql ), throughput (T ), average queueing delay ( D), overflow packet loss probability ( L P ) and packet dropping probability before the router buffer is overflowed ( p D ). This comparison evaluates the three AQM methods performance and then decides out which method offers more satisfactory performance measure results. The decision which method produces more satisfactory performance measure results is made solely depending on the varying of packet arrival probability parameter. This comparison shows that the Adaptive GRED offers the most satisfactory mql and D results when congestion occurs. Also, in presence of congestion; REDD1 loses the fewer packets due to buffer overflow and GRED drops the smallest number of packets before the router buffer has overflowed.
The Operator Splitting Method for Black-Scholes Equation  [PDF]
Yassir Daoud, Turgut ?zi?
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.26103
Abstract: The Operator Splitting method is applied to differential equations occurring as mathematical models in financial models. This paper provides various operator splitting methods to obtain an effective and accurate solution to the Black-Scholes equation with appropriate boundary conditions for a European option pricing problem. Finally brief comparisons of option prices are given by different models.
A finite difference scheme for magneto-thermo analysis of an infinite cylinder  [PDF]
Daoud S. Mashat
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.211159
Abstract: A finite different scheme as well as least-square method is presented for the magneto-thermo analysis of an infinite functionally graded hollow cylinder. The radial displacement, mechanical stresses and temperature as well as the electromagnetic stress are investigated along the radial direction of the cylinder. Material properties are assumed to be graded in the radial direction according to a novel exponential-law distribution in terms of the volume fractions of the metal and ceramic constituents. The governing second-order differential equations are derived from the equations of motion and the heat-conduction equation. The system of differential equations is solved numerically and some plots for displacement, radial stress, and temperature are presented.
Numerical Solution for a FG Cylinder Problem Using Finite-Difference Method  [PDF]
Daoud S. Mashat
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.21014
Abstract: A refined finite-difference approach is presented to solve the thermoelastic problem of functionally graded cylinders. Material properties of the present cylinder are assumed to be graded in the radial direction according to a power-law distribution in terms of the volume fractions of the metal and ceramic constituents. The governing second-order differential equations are derived from the motion and the heat-conduction equations. Numerical results for dimensionless temperature, radial displacement, mechanical stresses and electromagnetic stress are distributed along the radial directions. The effects of time parameter and the functionally graded coefficient are investigated.
A Fast Algorithm to Solve the Bitsadze Equation in the Unit Disk  [PDF]
Daoud Mashat, Manal Alotibi
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.21013
Abstract: An algorithm is provided for the fast and accurate computation of the solution of the Bitsadze equation in the complex plane in the interior of the unit disk. The algorithm is based on the representation of the solution in terms of a double integral as it shown by Begehr [1,2], some recursive relations in Fourier space, and Fast Fourier Transforms. The numerical evaluation of integrals at points on a polar coordinate grid by straightforward summation for the double integral would require floating point operation per point. Evaluation of such integrals has been optimized in this paper giving an asymptotic operation count of per point on the average. In actual implementation, the algorithm has even better computational complexity, approximately of the order of per point. The algorithm has the added advantage of working in place, meaning that no additional memory storage is required beyond that of the initial data. This paper is a result of application of many of the original ideas described in Daripa [3].
On the Communication Requirements for the Smart Grid  [PDF]
Mohamed Daoud, Xavier Fernando
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.31008
Abstract: The current power grid is facing many challenges that it was not designed or engineered to handle which range from congestions and major blackouts to the overwhelming increase in demand and security concerns. The current electric grid was established before the 1960’s. It is believed that the electric grid is the most complex and gigantic machine ever made in human history; it consists of wires, cables, towers, transformers and circuit breakers installed together in outdated manner. During the 60’s, computers and sensors were used to monitor and slightly control the grid; however, fifty years later these sensors are considered less than ideal. Presented here is a review of the smart grid communication network in terms of configuration, bandwidth and latency requirements as well as the technology used. We simulate the access layer of the smart grid net-work and show that no single available communication technology can be used for all layers of the smart grid; thus, different technologies for different layers are needed. A new protocol for optimizing the smart grid is recommended.
Content-Based Image Retrieval Using SOM and DWT  [PDF]
Ammar Huneiti, Maisa Daoud
Journal of Software Engineering and Applications (JSEA) , 2015, DOI: 10.4236/jsea.2015.82007
Abstract: Content-Based Image Retrieval (CBIR) from a large database is becoming a necessity for many applications such as medical imaging, Geographic Information Systems (GIS), space search and many others. However, the process of retrieving relevant images is usually preceded by extracting some discriminating features that can best describe the database images. Therefore, the retrieval process is mainly dependent on comparing the captured features which depict the most important characteristics of images instead of comparing the whole images. In this paper, we propose a CBIR method by extracting both color and texture feature vectors using the Discrete Wavelet Transform (DWT) and the Self Organizing Map (SOM) artificial neural networks. At query time texture vectors are compared using a similarity measure which is the Euclidean distance and the most similar image is retrieved. In addition, other relevant images are also retrieved using the neighborhood of the most similar image from the clustered data set via SOM. The proposed method demonstrated promising retrieval results on the Wang Database compared to the existing methods in literature.
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